Transmitter and signal transmission method

FIELD: radio engineering, communication.

SUBSTANCE: 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 of the transmitting antennae; a precoding unit configured to set the weight the signal sequences using a precoding matrix selected from a code module including multiple predefined precoding matrices; 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. The precoding unit applies different precoding matrices to different signal sequences, and the relationship between the different precoding matrices and the different signal sequences is determined through open-loop control which is independent of feedback from a receiver.

EFFECT: high capacity.

24 cl, 18 dwg

 

The technical field

The present 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 hour is now resource.

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) libunicode the 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 IDs of the user terminal (UE, 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 is pornoho 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 (precoding vector) or, more generally, a matrix of pre-coding (preceding matrix).

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 the circuit with the feedback vector pre-coding adaptive controlled by taking appropriate values, based on the feedback information from the receiving side (user terminal). Figure 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 figure 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 which of the two types of signal processing - signal processing in the preliminary coding or signal processing in the CCD was performed first.

Figure 3 schematically illustrates an example in which the signal processing of CCD is performed after signal processing in the preliminary coding. In figure 4, where are explained in more detail shown in figure 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 figure 4, the operations on 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. Figure 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 "Precoding for E-UTRA downlink MIMO", LG Electronics, Samsung and NTT-DoCoMo.

Figure 5 schematically illustrates an example in which the signal processing of pre-coding is performed after processing of the signal at the CCD, 6 explains in more detail is shown in figure 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. Figure 5 vectors pre-coding denoted as Ui. The optimal vector Uiadaptive is selected from a predefined set P of 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 figure 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 figure 3 and 4, or the second scheme, shown in figure 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 first and the second schema, 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 to the shown in figure 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 a defined weight of signal sequences using matrix pre-coding selected from a code module that contains a number of predefined matrices pre the preliminary coding; and the 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 the module preliminary coding uses a different matrix pre-coding to different signal sequences, and the relationship between various matrices pre-coding and a variety of signal sequences is determined using the control without feedback, do not depend on feedback information from the receiver.

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.

Brief description of drawings

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

Figure 2 schematically illustrates the principle explode on the delay.

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

Figure 4 illustrates in more detail the transmitter.

Figure 5 schematically illustrates a second variant of the transmitter that implements the CC and pre-encoding.

6 illustrates in more detail the transmitter.

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

Fig schematically illustrates an example of a structure of a transmitter in accordance with one embodiments of the present invention.

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

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

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

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

Figv schematically illustrates another example of the relationship between vectors pre-coding and subcarriers.

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

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

Fig schematically illustrates Opera is AI, performed in units of pre-coding in accordance with a third embodiment of the present invention.

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

Fig illustrates an example of simulation results for (NTxNRx)=(4, 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, 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, changed appropriately depending on a feedback signal received from the party with which communication occurs, as shown in figures 1, 5 and 6. This mode is suitable when driving slowly hand, the 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 sequences of the signal intended for transmission on different subcarriers are applied a predetermined 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, do not need the regulation 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 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 P of individual vectors pre-coding can be a multiple of the total number of subcarriers corresponding to one resource block, or be divides the LEM 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 various signal sequences or 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-coded what I can get out of the code module, storing 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 of operation, which is useful when using shared processing elements.

The modes of operation of the transmitter can be switched on request from the party with which communication occurs, for example, 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 of the spiral is by 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. The transmitter, 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, for example, the LTE system. Figure 9 shows the 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 to the second communication occurs (which is usually the user's terminal), defines the schema of the data modulation 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, there may be a 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 pre-coding using vecto the s pre-encoding, 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 pre-coding, but at 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 is in, 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 pre-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 P 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. Pre-defined criteria the definitions 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 pre-established 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 mode with feedback in the Mat is itzá pre-coding is likely there will be errors, 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 operation modes provided in the transmitter mode feedback mode without feedback. Mode feedback operations are performed similar to the known. In this case, as noted in connection with figures 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 tentative the aqueous encoding 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 slow-moving parties engaged in the communication.

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 figure 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 con is specific, 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, NFFTdenotes the 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.

Figure 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 U2 pre-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 module 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 P different directional beams. As shown in figure 10, and consequently the e use of P 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 of the signal within the frequency band individually distributed across P different directions that 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.

Figure 11, except that the number P of vectors stored in the code module 912, a multiple of the total number K(=NFFT) subcarriers P 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.

The piano is go for one resource block is recorded and used one type of vector pre-encoding, and for neighboring resource blocks are used vectors pre-coding of different types. This alternative implementation is suitable for the precise measurement of the level of noise and interference in the resource blocks. 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. On FIGU 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 P 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 otobrazheni the matrices 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 pre-coding, with the aim of enhancing 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 increase the effect of planting can be cyclically applied to several matrices pre-coding, as shown in figure 11.

OPTION

For simplicity, in the embodiment represented by figure 10, in precoder 1 to K for 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 through K are passed from module 904 series-parallel conversion. As shown in Fig processing elements with CCD 1 to K CCD, 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 one and t the th same subcarrier at different points in time.

Fig schematically illustrates an example computing operations precoder 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/P) 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 DT 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 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 m is the moment in time in the direction of Up, then the same operation is cyclically repeated. 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 P 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 distributed across all the P different directions. 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, 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/P) under ecosim with numbers 1-K cyclically applied vectors pre-coding U 2, ..., UP-1UP. Finally, at time (t=T+ΔT(P-1)/P) to subcarriers with numbers 1-K cyclically applied vectors pre-coding UPU1, ..., UP-1. For the application of P vectors pre-coding can be used in the methods discussed above in connection with 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 and 17. When modeling were used the following parameter values.

The number of OFDM subcarriers, NFFT:120;

<> The number of vectors pre-encoding, P: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.

The graph on Fig shows the relationship of the average SNR (signal-to-noise ratio, expressed in dB) 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, when 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 channel broadcasts decorel is arranged, 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 "○"corresponds to the transmitter of known construction, is presented in figure 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, another well-known designs is presented on figure 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, 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.

the Rafiq on Fig similar to Fig, 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 suitable 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 about the crimes 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 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 a defined weight of signal sequences using 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 antenna and module pre-coding uses a different matrix pre-coding to different signal sequences, and the relationship between various matrices pre-coding and a variety of signal sequences is determined using the control the population without feedback, do not depend on feedback information from the receiver.

2. The transmitter 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 a defined weight of signal sequences using 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 antenna and module pre-coding uses a different matrix pre-coding 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 of when is the MSC.

3. The transmitter 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 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 the module preliminary coding uses a different matrix pre-coding for different sequences of signal and applies the matrix to pre-encode to the same sequence of signal at different points in time.

4. The transmitter according to any one of claims 1 to 3, characterized in that the number of different matrices are 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 common divisor is the number of subcarriers contained in a predetermined frequency band.

5. The transmitter according to any one of claims 1 to 3, characterized in that several matrices pre-coding are used cyclically for different signal sequences or at different points in time.

6. The transmitter according to any one of claims 1 to 3, 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.

7. The transmitter according to any one of claims 1 to 3, 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.

8. The transmitter according to claim 3, 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.

9. Re atcic according to claim 7, characterized in that the number of modes of operation of the transmitter including a mode without feedback mode feedback, and at least part of the matrix pre-coding used in the module pre-coding is selected from a code module in mode with feedback depending on a feedback signal from the side that communicates with the transmitter.

10. The transmitter according to claim 9, characterized in that the change of modes is dependent on the execution in the transmitter pre-specified condition.

11. The transmitter of claim 10, characterized in that the detection mode with feedback errors in the feedback information is a change of mode feedback mode without feedback.

12. The transmitter according to any one of claims 1 to 3, characterized in that it further comprises a module explode on the delay made with the ability to set scales of several sequences of the signal transmitted from the processing module, to implement cyclic explode on the delay, and the output signals of the module explode on the delay are passed to the module prior encoding.

13. The transmitter according to claim 6, characterized in that it further comprises a module explode on the delay made with the ability to set scales of several sequences of the signal before the R of the transform module, to implement cyclic explode on the delay, and the output signals of the module explode on the delay are passed to the module prior encoding.

14. The transmitter according to claim 7, characterized in that it further comprises a module explode on the delay made with the ability to set scales of several sequences of the signal transmitted from the processing module, to implement cyclic explode on the delay, and the output signals of the module explode on the delay are passed to the module prior encoding.

15. The transmitter according to claim 1 or 3, 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.

16. The transmitter according to claim 1 or 3, characterized in that there are several distinct relationships between various matrices pre-coding and different sequences of signal and change these relationships occurs when the transmitter pre-specified condition.

17. The transmitter according to claim 1 or 3, characterized in that there are several distinct relationships between various matrices pre-coding and various posledovatelnostyakh and these relationships are used selectively depending on the user's terminal.

18. The transmitter according to claim 1 or 3, characterized in that there are several distinct relationships between various matrices pre-coding and different sequences of signal and change these relationships is dependent on the upward signal from the terminal of the user.

19. The transmitter according to claim 2 or 3, 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.

20. The transmitter according to claim 2 or 3, 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.

21. The transmitter according to claim 2 or 3, 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.

22. The method of signal transmission used in the transmitter that contains multiple transmitting antennas, comprising: a conversion step in which one or more threads of transmission include the data from any of the transmitting antenna, form multiple signal sequences corresponding to a predetermined frequency band; a step of pre-coding, which specify the weight 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 includes the use of different matrices are pre-coding to different signal sequences, and the relationship between various matrices pre-coding and a variety of signal sequences determine, using the control without feedback, do not depend on feedback information from the receiver.

23. 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 the hour is from; the step of pre-coding, which specify the weight 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 includes the use of different matrices are pre-coding identical to the sequences of the 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 that do not depend on feedback information from the receiver.

24. The 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 sequence si is Nala using 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 includes the use of different matrices are pre-coding to different signal sequences and the use of different matrices are pre-coding identical to the sequences of the signal at different points in time.



 

Same patents:

FIELD: radio engineering, communications.

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FIELD: radio engineering, communications.

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FIELD: radio engineering, communication.

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10 cl, 81 dwg

FIELD: radio engineering, communication.

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FIELD: radio engineering, communication.

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35 cl, 23 dwg

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5 cl, 22 dwg, 5 tbl

FIELD: communication systems.

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22 cl, 3 dwg, 4 tbl

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22 cl, 3 dwg, 4 tbl

FIELD: transmission of information, applicable in cellular and satellite communication systems.

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FIELD: communications engineering.

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70 cl, 19 dwg

Deep paging method // 2260912

FIELD: communication systems.

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EFFECT: higher efficiency.

4 cl, 6 dwg

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