Transmitter (versions) and signal transmission method (versions)

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used in wireless communication systems. The transmitter includes multiple transmitting antennae; a conversion unit configured to generate multiple signal sequences corresponding to a predefined frequency bandwidth from one or more transmission streams associated with any transmitting antenna; a precoding unit configured to set the weight of each signal sequence using a precoding matrix; and a transmitting unit configured to convert an output signal from the precoding unit into a number of signals corresponding to the number of transmitting antennae and transmit the converted signals from the transmitting antennae. If closed-loop control is performed, the precoding unit uses a precoding matrix selected from a codebook based on a precoding matrix indicator fed back from a receiver, and if open-loop control without relying on a feedback from the receiver is performed, the precoding unit uses a precoding matrix selected from a codebook such that mutually different precoding matrices are applied to different signal sequences.

EFFECT: high transmission throughput.

37 cl, 18 dwg

 

The technical field

The invention relates to the field of mobile communications, and more particularly to a transmitter having multiple antennas, and to a method of signal transmission.

The level of technology

In this field of technology are gaining pace of research and development work aimed at developing schemes for next generation mobile. The 3GPP, which is a standardization organization W-CDMA as a technology, the successor of W-CDMA, HSDPA and/or HSUPA, considers the communication scheme LTE (Long Term Evolution, long-term development). In LTE as radio access schemes in the descending and ascending lines of communication will be used, respectively, OFDM (Orthogonal Frequency Division Multiplexing, multiplexing orthogonal frequency division) and the scheme of SC-FDMA (Single-Carrier Frequency Division Multiple Access, multiple access frequency division on the same carrier) (see, for example, 3GPP TR 25.814(V7.0.0), "Physical Layer Aspects for Evolved UTRA", June 2006).

OFDM is a multi-carrier scheme. The bandwidth of this scheme is divided into more narrow frequency bands (subcarriers)and data is being transmitted in a separate narrower frequency bands. In OFDM subcarriers closely adjoin and overlap without interference (noise), resulting in faster and more efficient utilization of the frequency resources is owls.

SC-FDMA is a schema with a single carrier. The bandwidth of this scheme is divided into several frequency sub-bands and to reduce interference between terminals of each of the multiple terminal uses to transmit a particular frequency sub-range. In the scheme of SC-FDMA reduced variations in the transmit power to reduce the power consumption of the terminal and to expand the coverage area.

LTE is a communication system in which multiple terminal users sharing one or more of the ascending physical channels and one or more downlink physical channels. Channels to be shared by multiple user terminals, usually referred to by the generic channels (shared channels). In LTE upward communication is carried out through channels PUSCH (Physical Uplink Shared Channels, physical ascending shared channels), and downward communication is carried out through channels PDSCH (Physical Downlink Shared Channels, the physical top-down General channels).

In the communication system, which uses shared channels, each podagra (1 MS in LTE), you must indicate which terminal the user will be assigned to the common channel. In LTE control channels used for such messages (alarm), called channels PDCCH (Physical Downlink Control Channels, the physical top-down control channels) or the outbound control channels L1/L2 (Layer 1/Layer 2, level 1/level 2). For example, the PDCCH may include multiple information elements, such as top-down planning, information acknowledgement (ACK/NACK)grant ascending planning, indicators, overload and bits of the control command transmission power (see, for example, R1-070103, Downlink L1/L2 Control Signaling Channel Structure: Coding).

Information top-down planning and grant ascending planning are used to report how the terminal user will be assigned to the common channel. Information top-down planning, for example, may include information elements downlink shared channel as the information on the appointment of top-down resource blocks (RB resource block), the identity of the terminal user (LIE, user equipment, user devices), the number of threads in the MIMO information about the vectors pre-coding, data size, modulation scheme information and hybrid automatic request retransmission (HARQ, Hybrid Automatic Repeat reQuest). On the other hand, the grant of the rising planning may include information elements for ascending shared channel as the information on the appointment of the ascending resource blocks, the identity of the terminal user, data size, modulation scheme, information about transmission power in uplink communication and information demodulation signal in the scheme of MIMO uplink connection.

The scheme of the MIMO (Multiple Input Multiple Output, multiple inputs and multiple outputs) is a way mnogorannoe relationship in which to improve the speed and quality of transmission using multiple antennas. In this scheme by duplicating the transmitted signal streams and combining the duplicated signal streams using respective weighting coefficients ("weights") to the participants of communication can transmit beams with controlled orientation. This scheme is called the scheme of pre-coding; these weights are called the vector of pre-coding (preceding vector) or, more generally, a matrix of pre-coding (precoding matrix).

Fig.1 schematically illustrates an example of an operation of the preliminary coding. Each of the two streams (transmitted signals 1, 2) in modules duplication duplicated with the formation of a pair of threads, and each thread of the pair is multiplied by the vector of pre-coding. Then the streams are combined and transmitted, as shown. Pre-coding is divided into scheme with feedback (closed loop control) and the scheme without feedback (open loop control). In contrast to the scheme without feedback, in scheme with feedback vector pre-coding adaptive controlled by taking appropriate values, based on the feedback information from the receiving side (user terminal). In Fig.1 shows an example of operation with feedback. In the scheme of pre-coding of the individual streams are transmitted with a separation in space that can significantly improve the quality of the individual threads.

Meanwhile, the technology, called decomposition by delay or cyclic decomposition by the delay (CDD, cyclic delay diversity), which is subject to the transmission signal is formed by multiple redundant signals, the number of which corresponds to the number of antennas and for transmission of the signal from the modules duplication antennas are various delays. Since the same signal is transmitted at different points in time, the application of this technology is suitable for alignment signal quality between different threads.

As shown in Fig.2, the same signals are transmitted from multiple antennas at different points in time. The receiving party accepts the signals received through multiple paths, and combines them, which can give effect to explode.

CDD can be combined with the preliminary coding to improve quality at the expense of both CCD and pre-coding. In this case, the transmitted signals may have different characteristics depending on the CSOs, which of the two types of signal processing - signal processing in the preliminary coding or signal processing in the CCD was performed first.

Fig.3 schematically illustrates an example in which the signal processing of CCD is performed after signal processing in the preliminary coding. In Fig.4, which are explained in more detail shown in Fig.3 components, NFFTindicates the size of the FFT (FFT, fast Fourier transform, fast Fourier transform), τ denotes a delay, a Skndenotes the n-th stream of the k-th subcarrier.

As shown in Fig.4, operations of the individual components of the signal are represented in a matrix form, and the operation described by the matrix (Dkfor CDD, in the General case, commutativa with the operation described by the matrix (F) for pre-coding. For this reason, a more significant impact on transferable signals can have the last two sequentially performed operations on signals. In the present example, the effect of an increase in signal quality due to the use of CCD pronounced, and therefore there is a higher probability that the signal quality of transmitted streams can be aligned, however, the effect of increasing the signal quality through the use of pre-coding may be impaired. The application of this innovation is the schema may be useful in the preliminary coding without feedback, where is the vector of pre-encoding is not changed. In Fig.4 as the weighting factor used is the vector of pre-encoding, denoted as F. the Scheme of this type is disclosed, for example, in the document 3GPP R1-070236 "Preceding for E-UTRA downlink MIMO", LG Electronics, Samsung and NTT-DoCoMo.

Fig.5 schematically illustrates an example in which the signal processing of pre-coding is performed after processing of the signal at the CCD, Fig.6 explains in more detail is shown in Fig.5 components. And in this case, the signal processing performed by the latter, may have a more significant impact on transferable signal. Therefore, in the present example, the effect of an increase in signal quality due to the use of pre-coding pronounced, which can be useful for quality improvement in separate threads. However, the effect of increasing the signal quality due to the use of CCD may be impaired. For this reason, it is preferable adaptive control vectors pre-coding. In Fig.5 vectors pre-coding denoted as Ui. The optimal vector Uiadaptive is selected from a predefined set of P vectors pre-coding {U1U2, ..., UP}on the basis of a feedback signal from the opposite article the Rhone, involved in the relationship. In other words, this scheme is suitable for pre-coding scheme with feedback. The scheme of this type is disclosed, for example, in the document 3GPP R1-072461, "High Delay CDD in Rank Adapted Spatial Multiplexing Mode for LTE DL", Ericsson.

The control vector of the pre-coding in the preliminary coding with feedback has a significant advantage from the standpoint of improving the quality of the signal, consisting in the fact that the separate streams are transmitted in space separately. However, this adaptive to change the transmitted rays depending on the communication partner (user terminal). Thus, if the participant communication moves quickly, this management can be difficult. In this case, the effect of increasing the quality of the signal from the CCD can be expressed better than using pre-coding. In other words, it can be appropriate to perform a first pre-coding, as shown in Fig.3 and 4, then you can try to get a more pronounced effect of planting delay by using CCD. Thus, if the pre-coding is combined with CDD, the feasibility of using the first scheme, shown in Fig.3 and 4, or the second scheme, shown in Fig.5 and 6, depending on the status of the connection.

Fig.7 is illustreret the sample solution, based on the above considerations. In this example, the modules provide signal processing for the first and second circuits, which can be applied, the first and second schemes, and these schemes can be adaptively changed depending on conditions of communication. However, in this design must be two modules of the signal processing for CDD corresponding shown in Fig.4 and 6 D1-Dkthat would lead to the complication of the transmitter.

Disclosure of inventions

Thus, the aim of the present invention is the simplification of the transmitter with multiple transmit antennas, allowing the use of diversity for the delay and pre-encoding.

To solve the above problem, in one aspect the present invention features a transmitter that includes multiple transmitting antennas; a processing module, configured to formation of one or more threads of a transmission associated with any of the transmitting antenna, multiple signal sequences corresponding to a predetermined frequency band; module pre-coding is performed with an option to set the weight of each sequence signal using the matrix pre-coding; and a transmission module, configured to convert the output signal is Ala module pre-coding in multiple signals, which number corresponds to the number of transmitting antennas, and transmitting the converted signals from the transmitting antennas, and in the case of the implementation of the feedback control module preliminary coding uses a matrix of pre-coding is selected from the code module based on the indicator matrix pre-coding, which is provided as feedback from the receiver, and in the case of the implementation of control without feedback, do not depend on feedback information from the receiver module preliminary coding uses a matrix of pre-coding is selected from the code of the module so that mutually different matrices pre-coding is applied to different signal sequences.

In accordance with this aspect of the present invention, it becomes possible to simplify the transmitter with multiple transmit antennas, allowing the use of diversity for the delay and pre-encoding.

In addition, in another aspect, the invention features a transmitter that contains multiple transmitting antennas; a processing module, configured to formation of one or more threads of a transmission associated with any of the transmitting antenna, multiple placentas is Teleostei signal, the respective predetermined frequency band; module pre-coding is performed with an option to set the weight of each sequence signal using the matrix pre-coding selected from a code module that contains a number of predefined matrices pre-coding; and a transmission module, configured to convert the output signal of the module prior encode multiple signals, which number corresponds to the number of transmitting antennas, and transmitting the converted signals from the transmitting antennas, and in the module pre-coding mutually different matrices pre-coding is applied to the same sequence of signal at different points in time, and the relationship between various matrices prior coding and different points in time is determined using a control without feedback, do not depend on feedback information from the receiver.

In another aspect of the invention features a transmitter that contains multiple transmitting antennas; a processing module, configured to formation of one or more threads of a transmission associated with any of the transmitting antenna, multiple posledovatelno is her signal, the respective predetermined frequency band; module pre-coding is performed with a defined weight of signal sequences using matrix pre-coding; and a transmission module, configured to convert the output signal of the module prior encode multiple signals, which number corresponds to the number of transmitting antennas, and transmitting the converted signals from the transmitting antennas, and in the module pre-coding mutually different matrices pre-coding can be applied to various sequences of signal and mutually different matrices pre-coding is applied to the same sequence of signal at different points in time.

In another aspect of the invention proposes a method of signal transmission used in the transmitter that contains multiple transmitting antennas, comprising: a conversion step in which one or more threads of a transmission associated with any of the transmitting antenna, to form multiple signal sequences corresponding to a predetermined frequency band; a step of pre-coding, which specify the weight of each sequence signal using the matrix predvaritelniye; and a step of transmission, which converts the signal received at the step of pre-coding, multiple signals, which number corresponds to the number of transmitting antennas, and transmit the converted signals from the transmitting antennas, and in the case of the implementation of the feedback control on the step of pre-coding using a matrix of pre-coding is selected from the code module based on the indicator matrix pre-coding, which is provided as feedback from the receiver, and in the case of the implementation of control without feedback, do not depend on feedback information from the receiver, the step of pre-coding using a matrix of pre-coding is selected from the code of the module so that mutually different matrices pre-coding is applied to different signal sequences.

In another aspect of the invention proposes a method of signal transmission used in the transmitter that contains multiple transmitting antennas, comprising: a conversion step in which one or more threads of a transmission associated with any of the transmitting antenna, to form multiple signal sequences corresponding to a predetermined frequency band; a step of pre-Kadirova the Oia, which specify the weight of each sequence signal using the matrix pre-coding selected from a code module that stores a number of predefined matrices pre-coding; and a step of transmission, which converts the signal received at the step of pre-coding, multiple signals, which number corresponds to the number of transmitting antennas, and transmit the converted signals from the transmitting antennas, and the step of pre-coding mutually different matrices pre-coding is applied to the same sequence of signal at different points in time, and the relationship between various matrices pre-coding and different moments of time is determined using a control without reverse communication that is not dependent on feedback information from the receiver.

In another aspect of the invention proposes a method of signal transmission used in the transmitter that contains multiple transmitting antennas, comprising: a conversion step in which one or more threads of a transmission associated with any of the transmitting antenna, to form multiple signal sequences corresponding to a predetermined frequency band; a step of pre-coding, which specify the weight after the of euteleostei signal using a matrix pre-coding; and a step of transmission, which converts the signal received at the step of pre-coding, multiple signals, which number corresponds to the number of transmitting antennas, and transmit the converted signals from the transmitting antennas, and the step of pre-coding is used mutually different matrices pre-coding to different signal sequences and apply mutually different matrices pre-coding identical to the sequences of the signal at different points in time.

Brief description of drawings

Fig.1 schematically illustrates an example of an operation of the preliminary encoding.

Fig.2 schematically illustrates the principle explode on the delay.

Fig.3 schematically illustrates a first variant of the transmitter that implements CCD and advanced coding.

Fig.4 illustrates in more detail the transmitter.

Fig.5 schematically illustrates a second variant of the transmitter that implements CCD and advanced coding.

Fig.6 illustrates in more detail the transmitter.

Fig.7 illustrates an example implementation of a transmitter that implements the ability to switch between the first schema and the second schema.

Fig.8 schematically illustrates an example of a structure of a transmitter in accordance with one embodiments of nastoyascheevremya.

Fig.9 is a block diagram of a transmitter in accordance with one embodiments of the present invention.

Fig.10 schematically illustrates the computational procedure in the modules pre-coding in accordance with the first embodiment of the present invention.

Fig.11 schematically illustrates an example of the relationship between vectors pre-coding and subcarriers.

Fig.12A schematically illustrates an example of the relationship between vectors pre-coding and subcarriers.

Fig.12B schematically illustrates another example of the relationship between vectors pre-coding and subcarriers.

Fig.13 is a block diagram illustrating an embodiment of a transmitter.

Fig.14 schematically illustrates the computational procedure in the modules pre-coding in accordance with the second embodiment of the present invention.

Fig.15 schematically illustrates the operations performed by the modules pre-coding in accordance with a third embodiment of the present invention.

Fig.16 illustrates an example of simulation results for (NTxNRx)=(4, 2) and uncorrelated channels.

Fig.17 illustrates an example of simulation results for (NTxNRx)=(, 2) and correlated channels.

The LIST of SIGNS:

902: module signal conditioning;

904: module serial-to-parallel conversion (S/P);

906: module pre-encoding;

908: module parallel-serial conversion (P/S);

910: module OBPF (inverse fast Fourier transform);

912: code module;

914: selector;

916: module display subcarriers;

918: module switching mode.

The implementation of the invention

As shown in Fig.8, in accordance with one aspect of the present invention for the transmitter has two operating modes, namely mode feedback mode without feedback. Mode feedback vector pre-coding similar to well-known schemes is changed appropriately depending on a feedback signal received from the party with which communication occurs, as shown in Fig.1, 5 and 6. This mode is suitable for slow movement of the hand, with which communication occurs. In the mode without feedback operation preliminary coding differ from the operations of pre-coding is performed in the mode with feedback. In the transmitter in accordance with one aspect of the present invention, the signal sequences designed on the I transmit on different subcarriers, apply predefined number of vectors pre-coding. When this mode feedback it is assumed that for a certain number of consecutive subcarriers are relatively stable distribution channels. All stable subcarriers on the basis of feedback information from the terminal user use the same pre-coding.

The use of different weights for the respective subcarriers corresponds to the introduction of a delay of transmitted signals in time. Thanks to CDD, the use of different weights for the respective subcarriers can improve signal quality even in the mode without feedback. The relationship between the various vectors of pre-coding and different subcarriers quickly and easily determined using the control without feedback, do not depend on feedback information from the receiver. In addition, as shown in Fig.8, does not require the duplication module signal processing for CDD. Thus, it is possible to simplify the transmitter with multiple transmit antennas, which implements the decomposition by the delay and pre-encoding.

In accordance with one embodiments of the present invention, the module pre-coding can apply different the s vectors pre-coding to the same sequence of signal at different points in time. In the above embodiment, various vectors pre-coding is used so that when it is located in the frequency direction, whereas in this embodiment, these vectors are used so that are located in the temporal direction. In yet another embodiment, different vectors pre-coding can be used so that will be located in the frequency direction and the time direction. The relationship between the various vectors of pre-coding and different subcarriers and/or points in time quickly and easily determined using control without feedback, do not depend on feedback information from the receiver.

The number R of individual vectors pre-coding can be a multiple of the total number of subcarriers corresponding to one resource block, or you must be a divisor of the total number of subcarriers corresponding to one resource block. Thus, different vectors pre-coding can be used almost on the same frequency that it is expedient for the unification of the effect of diversity on the delay.

Various vectors pre-encoding, U1, ..., UPcan a loop be used for different sequences, the signal is either at different points in time. It is preferable to simplify distinguishing vectors pre-coding applied to different signals.

A certain vector of pre-coding can be applied to multiple signal sequences corresponding to neighboring subcarriers, whereas multiple signal sequences corresponding to the other adjacent subcarriers can be applied to other vector pre-coding. In particular, for a single resource block can be used only one type of vector pre-coding. It is preferable to determine the exact noise level or the level of interference for each unit of resources to improve planning and increase throughput.

In a number of modes of operation of the transmitter may enter a mode without feedback mode feedback. Mode feedback vectors pre-coding can be selected from a code module that stores multiple pre-defined vectors pre-coding. Vectors pre-coding for use in the mode without feedback can also be selected from the code module. Thus the vectors pre-coding is selected from a code module in each of these modes, it is advisable that when used is the so called common processing elements.

The modes of operation of the transmitter can be switched on request from the party with which communication occurs, such as a user terminal, which started to move quickly. It is preferable for fast mode switching during communication, where the receiving party is the transmitter.

Weight for cyclic explode on delay can be applied to sequences of the signal transmitted from the conversion module. It is preferable from the viewpoint of use of the existing operations explode on delay without modifications.

For convenience, the present invention is described using specific embodiments, but the separation of the embodiments of irrelevant to the present invention, and in accordance with jointly can be used two or more embodiments. To facilitate understanding of the present invention uses some specific numerical values, but, if not specifically stated otherwise, these numerical values are merely examples, and may be used instead of any other appropriate values.

The first option exercise

STRUCTURAL DIAGRAM of the TRANSMITTER

Fig.9 is a block diagram of a transmitter in accordance with one embodiments of the present invention. Before the chick, although described hereinafter referred to as a base station that communicates with user terminals in the mobile communication system may be implemented as any other device. Under the mobile communication system is a system of communication, where communication in the downstream direction uses OFDM, such as the LTE system. In Fig.9 shows a module 902, the signal conditioning module 904 series-parallel conversion (S/P)module 906 pre-coding module 908 parallel-serial conversion (P/S), modules 910-1...910-M OBPF, code module 912, the selector 914, a module 916 display subcarriers and the module 918 switching mode.

Module 902 signal generates top-down signals. The generated signals may be any suitable signals transmitted using the OFDM scheme. For example, module 902 signal based on the CQI (channel quality indicator, a quality indicator channel), reported by the party with which communication occurs (which is usually the user's terminal), determines the modulation scheme data, the scheme, channel coding, power level and/or other parameters for the signal to be sent to the party with which communication occurs, and performs some operations that meet certain thus parameters. In addition, may predestine the number of threads depending on the amount of downstream traffic the number of transmitting antennas, the number of receiving antennas of the user terminal and/or other parameters.

Module 904 series-parallel conversion converts the incoming stream transmission in several signal sequences, the number of which corresponds to the number of subcarriers contained in a predetermined frequency band. The number of components in the specified sequence signal corresponds to the number of transmitting antennas. For example, the sequence Sksignal associated with the k-th subcarrier, has S components Sk1, Sk2, ..., SkSsignal, where S denotes the number of sending threads. The number of S transmission threads is an integer that is less than or equal to the number of transmitting antennas. Predefined frequency band can be a system band width, for example, 5 MHz, 10 MHz or 20 MHz.

Module 906 preliminary coding using vectors pre-coding assigns a weight corresponding sequences of signal to subcarriers. In the illustrated embodiment, the total number of subcarriers is equal To, and module 906 pre-coding has To precoders. Operations precoder 1 through K are described below. In the further description, for convenience, use vectors preliminary codero the project, but when a more General consideration under the vectors pre-coding can be understood matrix pre-encoding.

Module 908 parallel-serial conversion performs operations that are performed in reverse module 904 series-parallel conversion. Module 908 parallel-serial conversion converts the input sequence signal, the number of which corresponds to the number of subcarriers in multiple threads, used for transmission.

Each of the modules 910-1...910-M OBPF converts the input transmission flow in streams of transmit symbols in accordance with the OFDM scheme. For example, the module 910-1 OBPF generates a stream of symbol transferable from the first transmitting antenna, and performs inverse fast Fourier transform (OBPF, IFFT) and modulation in accordance with the OFDM scheme. To simplify the illustration is not shown, some operations, such as adding a cyclic prefix, digital-to-analog conversion, frequency conversion, limiting the bandwidth and gain power.

Code module 912 stores the set of vectors pre-coding. For example, in the code module 912 can be pre-planned R vectors pre-encoding, U1U2, ..., UP. When the vectors before alternova coding with feedback (CL, closed loop)of P vectors pre-coding on the basis of the feedback signal from the party with which communication occurs (user terminal), selects any one of the vector pre-coding, for example Uithat is then passed to module 906 pre-coding a module 918 mode switching. The feedback signal from the party with which communication occurs, is called the indicator matrix pre-coding (preceding matrix indicator (PMI), and identifies each of the R vectors pre-coding. Typically, PMI defines the user's terminal.

In the case of operation of the transmitter in mode without feedback, and no feedback is used, the selector 914. The selector 914 selects from the code module 912 a particular vector of pre-coding in accordance with predetermined criteria. Predefined criteria described below.

Module 916 display subcarriers defines the relationship of the vector pre-coding selected by the selector 914, subcarrier, and transmits certain thus the relationship in module 906 pre-coding a module 918 to switch mode.

Module 918 mode switching switches the modes of operation of the transmitter in accordance with paraneetroplus criteria. In one example, the module 918 mode switching can switch modes depending on the speed side, with which communication occurs. In this example, if the party with which communication occurs, moves at a low speed, the module 918 switching mode selects the mode of operation with feedback. On the other hand, if the party with which communication occurs, moving with great speed, the module 918 switching mode selects the mode of operation without feedback. In another example, the module 918 mode switching can change modes in response to the fall of the signal quality in the ascending or descending line below a predetermined level. The modes can be switched in response to a request from the user terminal or depending on the measurement conditions of signal propagation. In addition, if the transmitter determines that the state feedback matrix pre-coding is likely there will be errors, the module 918 mode switching can perform the switching without feedback. In any case, the module 918 mode switching can switch modes in response to the occurrence of a transmitter pre-defined event mode switching.

The OPERATION of the TRANSMITTER: FEEDBACK

As the e modes the transmitter has a mode feedback mode without feedback. Mode feedback operations are performed similar to the known. In this case, as noted in connection with Fig.1, 5 and 6, the vectors pre-coding changes required depending on the feedback signals (PMI), transferred to parties that communicate. As a rule, as vectors pre-coding can be used vectors among the vectors U1U2, ..., UPin advance stored in the code module 912. The PMI indicators identify any of the vectors U1U2, ..., UP. In the more General case, the vectors of the pre-coding may not be selected from the specified options and configurable adaptive way with the formation of the required vectors. To reduce the workload in managing vectors and create opportunities for adaptive management, it is desirable to limit the set of source vectors pre-coding the appropriate choice from among the vectors. In mode feedback vectors pre-coding shall adaptive to change depending on the location of the parties engaged in the communication. Thus, from the point of view of improving the quality mode feedback for fast-moving parties engaged in communication, can give better results than for the slow movement is working parties communicates.

The OPERATION of the TRANSMITTER: WITHOUT FEEDBACK

With the rapid movement of the hand, with which communication occurs, adaptive change vectors pre-coding difficult. In this case, the improvement of quality by passing through the delay CDD can be more effective quality improvement due to the change vectors of the preliminary coding. To enhance the effect of improving the quality associated with the application of CDD, the computational procedure relating to CDD, can be performed after operations pre-coding, but for this transmitter must be so designed, as shown in Fig.7, which leads to complication of the complete transmitter.

At the same time, as shown in Fig.4, the computational operations that implement the decomposition by the delay CDD in the frequency domain, can be represented as operations on components of the signal of the kth subcarrier and a certain matrix Dk. More specifically, the above computation can be represented as the multiplication of the multiplier exp(-j(2πmτ/NFFT)k), where m=0, ..., M-1, several components of the signal, the number of which corresponds to the number of S streams transmitted on a subcarrier. Here S denotes the number of threads send (S≤M), M denotes the number of transmitting antennas, NFTTon the mean number of elements of the signal processing, used in the Fourier transform and inverse Fourier transform, and τ denotes the delay in CDD. When the multiplication of different weights (weights) to the corresponding signal components of different subcarriers resulting signals can have some diversity on the delay. Based on the above assumptions, the authors of the present invention invented the scheme of vectors pre-coding to individual subcarriers order to obtain the effect of diversity on delay without duplication of functional elements used for CDD.

Fig.10 schematically illustrates an example computing operations in precoder shown in Fig.9. In contrast to known circuits, here in a separate precoder uses different vectors pre-coding. For example, the vector U1pre-coding is applied to the first subcarrier S1vector U2pre-coding is applied to the second subcarrier S2... , and the vector UPpre-coding is applied to the P-th subcarrier SP. For (P+1)-th and subsequent subcarriers reused vectors U1U2, ..., UPpreliminary coding. These vectors U1U2, ..., UPpre-coding pre-stored in the code m is dule 912; these are the same vectors that are used in the mode with feedback. The purpose of using other vectors for the respective subcarriers in the mode without feedback can be provided and used vectors that differ from the vectors U1U2, ..., UPprovided for a mode with feedback. It should be noted that the vectors preferably are selected from the same code module 912 in the mode of the feedback and no feedback.

As mentioned above, the vectors of pre-encoding, U1U2, ..., UPhere are the same as used in the mode with feedback and change depending on the location of the parties engaged in communication (terminal user). Thus, the vectors U1U2, ..., UPpre-coding can be associated with a different directional beams. As shown in Fig.10, the sequential application of the R vectors pre-coding to individual subcarriers mode without feedback corresponds to the transfer of certain carriers in certain directions, that is, the transmission subcarriers with non-jP+1, (P+1)-th, (2P+1)-th, ...) in the direction U1, transmission subcarriers with non-jP+2, (P+2)-th, (2P+2)-th, ...) in the direction U2and so on (j=0, 1, 2, ...). Thus the individual components is of igala within the frequency band individually distributed across the different areas, what it is advisable to enhance the effect of dispersing the signal.

In the illustrated example, the total number K (=NFFT) set of subcarriers multiple of the number P of vectors stored in the code module 912, although the present invention is not limited to this option. This makes it possible to achieve uniform use of different vectors across the frequency band, which is preferable in order to achieve uniformity of signal quality.

In Fig.11 except that the number P of vectors stored in the code module 912, a multiple of the total number K (=NFFT) subcarriers, R also corresponds to the total number of subcarriers contained in a single resource block. The terminal user is assigned descending radioresource, and resources, which occupies a frequency band (e.g., 12 subcarriers) and has a specific duration (for example, 1 MS), form a single element. This alternative implementation is suitable for improving the uniformity of the quality of the resource blocks.

In Fig.12A for a single resource block is recorded and used one type of vector pre-coding, and to neighboring resource blocks are used vectors pre-coding of different types. This alternative implementation is suitable for the precise measurement of the noise level and the level of interference is in blocks of resources. Since the noise level and the level of interference for the individual resource blocks (RB) can be used as a basis for allocating resources and/or for other purposes, a reliable assessment of the level of noise and interference preferred for proper planning. In the more General case with the same vector of pre-coding can be used any number of adjacent subcarriers. In Fig.12V matrix pre-coding cyclically applied every three subcarriers.

In the above embodiments, the implementation of all P vectors pre-coding provided for a mode with feedback, are also used in the mode without feedback, which, however, does not limit the present invention. In the mode without feedback can be used only part of the R vectors pre-coding, stored in the code module 912.

The number of S spatially multiplexed signals may vary depending on the conditions of propagation of the signal in the MIMO system. In one of the embodiments of the present invention, the display matrix pre-coding on the subcarriers may vary depending on the number S of spatially multiplexed signals. For example, if S=1, when it is easier to get a greater effect from predvaritelnogo the coding to increase the effect of pre-coding for all subcarriers used the same matrix pre-coding (e.g., U1). When S is equal to or larger than 2, to enhance the effect of planting can be cyclically applied to several matrices pre-coding, as shown in Fig.11.

OPTION

For simplicity, the embodiment shown in Fig.10, precoder 1 through To individual subcarriers used different vectors pre-coding, which can have a significant impact explode on delay even in the mode without feedback. In this case, no matter what the input signals in precoder 1 To be transmitted from the module 904 series-parallel conversion. As shown in Fig.13, processing elements with CCD 1 to the CCD To, intended for use in CCD mode with feedback, can be used similarly.

The second option exercise

In the first embodiment, different vectors pre-coding is applied to different subcarriers, whereas in the second embodiment of the present invention different vectors pre-coding is applied to the same subcarrier at different points in time.

Fig.14 schematically illustrates primericaonline operations precoder, it is shown in Fig.9, in accordance with the second embodiment. At a certain point in time (t=T) for all subcarriers used the same vector U1preliminary coding. At another point in time (t=T+ΔT/R) for all subcarriers used vector U2preliminary coding. Finally, at time (t=T+ΔT(P-1)/P) for all subcarriers used vector UPpreliminary coding. Thus, within a certain interval ΔT vectors U1U2, ..., UPpreliminary coding queue is used for all subcarriers. The interval ΔT is set larger than the time needed for the sequential switching of the P vectors pre-encoding.

As mentioned above, the vectors U1U2, ..., UPpre-coding can be considered in conjunction with R different directional beams. In this embodiment, the vectors of the pre-coding is used for all subcarriers during interval ΔT change in the order U1U2, ..., UP. This means that in the frequency band at a particular point in time, the signals are transmitted in the direction U1in the next moment in the direction U2... and the P-th moment of time in the direction UPafter which the same operation cycle is Eski again. It should be noted that, unlike conventional circuits, the shift vectors of the pre-coding is performed regardless of the location of the parties that communicate. In the first embodiment, components of the signal to subcarriers within a predetermined frequency band at the same time are distributed according to R different directions. In the second embodiment, components of the signal to subcarriers at any given moment is directed in one direction only, but during the interval ΔT signal components are distributed across the different areas. This alternative implementation is also feasible to enhance the effect of diversity on the delay.

A third option exercise

In the third embodiment are combined scheme in accordance with the first embodiment and the scheme in accordance with the second embodiment. In other words, different vectors pre-coding are applied simultaneously to different subcarriers in different times to the same subcarrier.

As shown in Fig.15, at a certain point in time (t=T) the vectors U1, ..., UPpreliminary coding cyclically applied to subcarriers with numbers from 1 to K. Then, in another moment of time (t=T+ΔT/R) to subcarriers with numbers from 1 To cyclically apply factoryproperties encoding U 2, ..., UP-1UP. Finally, at time (t=T+ΔT(P-1)/P) to subcarriers with numbers from 1 To cyclically apply vectors pre-coding UPU1, ..., UP-1. For the application of R vectors pre-coding can be used in the methods discussed above in connection with Fig.11 and 12.

In accordance with this embodiment the components of the distributed subcarrier in the frequency direction and the time direction, it is necessary to enhance the effect of diversity on the delay.

In all the above embodiments, the implementation can have multiple types of relationships between the different matrices pre-coding and different signal sequences. These relationships can be applied selectively depending on requests from the user terminal or from decisions made in the base stations. For example, the relationship may vary over a relatively long period of time.

The fourth option exercise

The simulation results of the transmitter in accordance with one embodiments of the present invention are described hereinafter with reference to Fig.16 and 17. When modeling were used the following parameter values:

The number of OFDM subcarriers, NFFT: 120

The number of vectors pre-coding, R: 12;

The number of subcarriers in one resource block: 12;

The channel broadcasts: correlated channel or uncorrelated channel;

The speed of movement of the user terminal acting as a receiver: 60 km/h

In the simulation it is assumed that the used coding with adaptive modulation based on the CQI.

Graph of Fig.16 shows the relationship of the average SNR (signal-to-noise ratio, expressed in decibels) and spectral efficiency (expressed in bit/s/Hz) for two transmitting antennas and four receiving antennas. Average SNR (dB)measured on the horizontal axis, is deteriorating in the direction of the left and improving in the right direction. Put on the vertical axis spectral efficiency indicates the bandwidth of a single bandwidth (amount of data successfully received per unit of time). Thus, the deterioration of the average SNR decreases throughput. This case corresponds to the situation when the user is far from the base station or moving quickly. On the other hand, when the improvement in the average SNR, the throughput increases. This corresponds to the case when the user is close to a base station or moving slowly. When shown the simulation it is assumed that the channels rediapered and uncorrelated, i.e., the channels of radio transmission between the transmitting antennas and receiving antennas are independent of each other.

On the graph, the curve indicated by the symbol "ο"corresponds to the transmitter of known construction, is shown in Fig.3 and 4, which for simplicity is called known scheme 1. This transmitter performs CDD after operations preliminary coding and is suitable for feedback control. The curve indicated by symbol "□", corresponds to the transmitter of another known construction, is shown in Fig.5 and 6, for simplicity called well-known scheme 2. This transmitter performs CDD operations before pre-coding and is suitable for control without feedback. The curve indicated by the symbol "♦"corresponds to the transmitter in accordance with the present invention, i.e. the transmitter is operating in the mode without feedback. As can be seen from Fig.16, when the moving speed of about 60 km/h it is shown that the well-known scheme 1 has better characteristics than the known circuit 2, so that it is preferable for the feedback control. The transmitter in accordance with the present invention, switching between feedback and mode without feedback, even in the mode without feedback gives the same effect explode on delay, known as scheme 1.

G is Afik in Fig.17 are similar to those shown in Fig.16, except for the fact that the quality of the radio channels used in correlated channels.

Although the present invention is described with the division into the above specific embodiments of these options implementation is only an illustration, and the person skilled in the art will be apparent possibility of implementing the present invention in other variations, modifications, alterations, substitutions and / or other changes. To facilitate understanding of the present invention used specific numerical values, but, if not specifically stated otherwise, these numerical values are merely examples, and may be used instead of any other appropriate values. The separation of the embodiments of irrelevant to the present invention, and in accordance with the necessity can be combined two or more embodiments. For convenience of explanation, the device in accordance with the variants of implementation of the present invention was described using block diagrams, but these devices can be performed using hardware, software or combinations thereof. The present invention is not limited to the above variants of implementation and may include alternatives, modifications, alterations, and substitutions without whom otstuplenija from the essence of the present invention.

This application is based on application of Japan No. 2007-161943 filed June 19, 2007, the entire contents of which are incorporated herein by reference.

1. The transmitter contains:
multiple transmitting antennas;
the transformation module made with the possibility of the formation of one or more threads of a transmission associated with any of the transmitting antenna, multiple signal sequences corresponding to a predetermined band of frequencies;
module pre-coding is performed with an option to set the weight of each sequence signal using the matrix pre-coding; and
a transmission module, configured to convert the output signal of the module prior encode multiple signals, which number corresponds to the number of transmitting antennas, and transmitting the converted signals from the transmitting antennas, and
in the case of the implementation of the feedback control module preliminary coding uses a matrix of pre-coding is selected from the code module based on the indicator matrix pre-coding, which is provided as feedback from the receiver, and in the case of the implementation of control without feedback, not dependent information is mainly the Oh connection from the receiver, module pre-coding uses a matrix of pre-coding is selected from the code of the module so that mutually different matrices pre-coding is applied to different signal sequences.

2. The transmitter under item 1, characterized in that if the velocity of the hand, with which communication occurs is low, the module pre-coding selects the feedback control, and if the velocity of the hand, with which communication occurs is high, the module pre-coding selects control without feedback.

3. The transmitter under item 1 or 2, characterized in that the number of mutually different matrices pre-coding a multiple of the total number of subcarriers in one of a predetermined set of resource blocks contained in a predetermined frequency band, or is a divisor of the total number of subcarriers contained in a predetermined frequency band.

4. The transmitter under item 1 or 2, characterized in that several matrices pre-coding are used cyclically for different signal sequences or at different points in time.

5. The transmitter under item 1 or 2, characterized in that a matrix of pre-coding is applied to some of the sequences of the signal, the corresponding neighboring subcarriers, whereas multiple signal sequences corresponding to other neighboring subcarriers used another matrix pre-encoding.

6. The transmitter under item 1 or 2, characterized in that a matrix of pre-coding is applied to multiple signal sequences corresponding to neighboring subcarriers, whereas multiple signal sequences corresponding to other neighboring subcarriers used another matrix pre-coding, and multiple matrices pre-coding are used cyclically.

7. The transmitter under item 1, characterized in that depending on the number of sending threads and the number of transmitting antennas are different relationships between the different matrices pre-coding and different signal sequences.

8. The transmitter under item 1, characterized in that there are several distinct relationships between various matrices pre-coding and different signal sequences, and the change of these relationships occurs when the transmitter pre-specified condition.

9. The transmitter under item 1, characterized in that there are several distinct relationships between various matrices tentatively the preliminary coding and different signal sequences, and these relationships are used selectively depending on the user's terminal.

10. The transmitter under item 1, characterized in that there are several distinct relationships between various matrices pre-coding and different signal sequences, and the change of these relationships is dependent on the upward signal from the terminal of the user.

11. The transmitter contains:
multiple transmitting antennas;
the transformation module made with the possibility of the formation of one or more threads of a transmission associated with any of the transmitting antenna, multiple signal sequences corresponding to a predetermined band of frequencies;
module pre-coding is performed with an option to set the weight of each sequence signal using the matrix pre-coding selected from a code module that contains a number of predefined matrices pre-coding; and
a transmission module, configured to convert the output signal of the module prior encode multiple signals, which number corresponds to the number of transmitting antennas, and transmitting the converted signals from the transmitting antennas, and
in the module prior to the investing mutually different matrices pre-coding is applied to the same sequence of signal at different points in time, and the relationship between various matrices pre-coding and different points in time is determined using a control without feedback, do not depend on feedback information from the receiver.

12. Transmitter on p. 11, characterized in that the number of mutually different matrices pre-coding a multiple of the total number of subcarriers in one of a predetermined set of resource blocks contained in a predetermined frequency band, or is a divisor of the total number of subcarriers contained in a predetermined frequency band.

13. Transmitter on p. 11, characterized in that several matrices pre-coding are used cyclically for different signal sequences or at different points in time.

14. Transmitter on p. 11, characterized in that a matrix of pre-coding is applied to multiple signal sequences corresponding to neighboring subcarriers, whereas multiple signal sequences corresponding to other neighboring subcarriers used another matrix pre-encoding.

15. Transmitter on p. 11, characterized in that a matrix of pre-coding is applied to multiple signal sequences corresponding to the adjacent raised the entity, while multiple signal sequences corresponding to other neighboring subcarriers used another matrix pre-coding, and multiple matrices pre-coding are used cyclically.

16. Transmitter on p. 11, characterized in that the various relationships between the different matrices pre-coding and different points in time are applied depending on the number of sending threads.

17. Transmitter on p. 11, characterized in that there are several distinct relationships between various matrices pre-coding and different points in time, and these relationships are used selectively depending on the user's terminal.

18. Transmitter on p. 11, characterized in that there are several distinct relationships between various matrices pre-coding and different points in time, and change these relationships is dependent on the upward signal from the terminal of the user.

19. The transmitter contains:
multiple transmitting antennas;
the transformation module made with the possibility of the formation of one or more threads of a transmission associated with any of the transmitting antenna, multiple signal sequences corresponding to the pre-C is a given frequency band;
module pre-coding is performed with a defined weight of signal sequences using matrix pre-coding; and
a transmission module, configured to convert the output signal of the module prior encode multiple signals, which number corresponds to the number of transmitting antennas, and transmitting the converted signals from the transmitting antennas, and
module pre-coding mutually different matrices pre-coding can be applied to various sequences of signal and mutually different matrices pre-coding is applied to the same sequence of signal at different points in time.

20. The transmitter under item 19, characterized in that the number of mutually different matrices pre-coding a multiple of the total number of subcarriers in one of a predetermined set of resource blocks contained in a predetermined frequency band, or is a divisor of the total number of subcarriers contained in a predetermined frequency band.

21. The transmitter under item 19, characterized in that several matrices pre-coding are used cyclically for different signal sequences or at different points in time.

22.Transmitter on p. 19, characterized in that a matrix of pre-coding is applied to multiple signal sequences corresponding to neighboring subcarriers, whereas multiple signal sequences corresponding to other neighboring subcarriers used another matrix pre-encoding.

23. The transmitter under item 19, characterized in that a matrix of pre-coding is applied to multiple signal sequences corresponding to neighboring subcarriers, whereas multiple signal sequences corresponding to other neighboring subcarriers used another matrix pre-coding, and multiple matrices pre-coding are used cyclically.

24. The transmitter under item 19, characterized in that the matrix pre-coding used in the module pre-coding is selected from a code module that contains a number of predefined matrices pre-encoding.

25. The transmitter under item 19, characterized in that depending on the number of sending threads and the number of transmitting antennas are different relationships between the different matrices pre-coding and different signal sequences.

26. The transmitter under item 19, characterized in that the por is gusmorino several different relationships between various matrices pre-coding and different signal sequences, and change these relationships occurs when the transmitter pre-specified condition.

27. The transmitter under item 19, characterized in that there are several distinct relationships between various matrices pre-coding and different signal sequences, and these relationships are used selectively depending on the user's terminal.

28. The transmitter under item 19, characterized in that there are several distinct relationships between various matrices pre-coding and different signal sequences, and the change of these relationships is dependent on the upward signal from the terminal of the user.

29. The transmitter under item 19, characterized in that the various relationships between the different matrices pre-coding and different points in time are applied depending on the number of sending threads.

30. The transmitter under item 19, characterized in that there are several distinct relationships between various matrices pre-coding and different points in time, and these relationships are used selectively depending on the user's terminal.

31. The transmitter under item 19, characterized in that there are several distinct relationships between the different matrices of the seat reservation coding and different points in time, and change these relationships is dependent on the upward signal from the terminal of the user.

32. The method of signal transmission used in the transmitter that contains multiple transmitting antennas, including:
a conversion step in which one or more threads of a transmission associated with any of the transmitting antenna, to form multiple signal sequences corresponding to a predetermined band of frequencies;
the step of pre-coding, which specify the weight of each sequence signal using the matrix pre-coding; and
step transmission, which converts the signal received at the step of pre-coding, multiple signals, which number corresponds to the number of transmitting antennas, and transmit the converted signals from the transmitting antennas, and
in the case of the implementation of the feedback control on the step of pre-coding using a matrix of pre-coding is selected from the code module based on the indicator matrix pre-coding, which is provided as feedback from the receiver, and in the case of the implementation of control without feedback, do not depend on feedback information from the receiver, the step of pre-coding is used Matri is the pre-coding selected from the code of the module so that mutually different matrices pre-coding is applied to different signal sequences.

33. The method according to p. 32, wherein if the speed of movement of the hand, with which communication occurs is low, the step of pre-coding selects the feedback control, and if the velocity of the hand, with which communication occurs is high, the step of pre-coding select control without feedback.

34. The method of signal transmission used in the transmitter that contains multiple transmitting antennas, including:
a conversion step in which one or more threads of a transmission associated with any of the transmitting antenna, to form multiple signal sequences corresponding to a predetermined band of frequencies;
the step of pre-coding, which specify the weight of each sequence signal using the matrix pre-coding selected from a code module that stores a number of predefined matrices pre-coding; and
step transmission, which converts the signal received at the step of pre-coding, a number of signals, the number of which corresponds to the number of peredumaete, and transmit the converted signals from the transmitting antennas, and
in the step of pre-coding mutually different matrices pre-coding is applied to the same sequence of signal at different points in time, and the relationship between various matrices pre-coding and different points in time are determined with the help of control without feedback, do not depend on feedback information from the receiver.

35. The method of signal transmission used in the transmitter that contains multiple transmitting antennas, including:
a conversion step in which one or more threads of a transmission associated with any of the transmitting antenna, to form multiple signal sequences corresponding to a predetermined band of frequencies;
the step of pre-coding, which specify the weight sequence signal using the matrix pre-coding; and
step transmission, which converts the signal received at the step of pre-coding, multiple signals, which number corresponds to the number of transmitting antennas, and transmit the converted signals from the transmitting antennas, and
in the step of pre-coding is used mutually different matrices pre-coding the different sequences of signal and apply mutually different matrices pre-coding identical to the sequences of the signal at different points in time.

36. A receiver configured to receive signals transmitted from multiple transmitting antennas provided in the transmitter, and
in the incoming receiver signals for each of multiple sequence signal generated in accordance with predetermined frequency band of one or more threads of a transmission associated with any of the transmitting antenna, set the weight using the matrix pre-coding produced the conversion to a number of signals, the number of which corresponds to the number of transmitting antennas, and the transmission from the transmitting antennas, and
in the incoming receiver signals in the case of the implementation of the feedback control matrix is used pre-coding is selected from the code module based on the indicator matrix pre-coding, which is provided as feedback from the receiver, and in the case of the implementation of control without feedback, do not depend on feedback information from the receiver uses a matrix pre-coding, the selected code module so that mutually different matrices pre-coding is applied to different signal sequences.

37. Communication system, comprising:
the transmitter includes niskonapieciowych antennas; and
a receiver receiving signals transmitted from multiple transmitting antennas provided in the transmitter,
when this transmitter contains:
the transformation module made with the possibility of the formation of one or more threads of a transmission associated with any of the transmitting antenna, multiple signal sequences corresponding to a predetermined band of frequencies;
module pre-coding is performed with an option to set the weight of each sequence signal using the matrix pre-coding; and
a transmission module, configured to convert the output signal of the module prior encode multiple signals, which number corresponds to the number of transmitting antennas, and transmitting the converted signals from the transmitting antennas, and
in the case of the implementation of the feedback control module preliminary coding uses a matrix of pre-coding is selected from the code module based on the indicator matrix pre-coding, which is provided as feedback from the receiver, and in the case of the implementation of control without feedback, do not depend on feedback information from the receiver module preliminary coding use the em matrix pre-encoding, selected from the code of the module so that mutually different matrices pre-coding is applied to different signal sequences.



 

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