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Multi-user mimo transmissions in wireless communication systems Invention relates to multi-user multiple input multiple output (MU-MIMO) wireless communication systems. An aspect of the invention consists in improving an apparatus and a method for providing and using control information in a mobile communication system. The invention particularly discloses a method for outputting control information in MU-MIMO wireless communication systems, which includes receiving a plurality of resource elements (RE) including downlink control information (DCI), determining, using the DCI, a set of RE to which a plurality of downlink reference signals (DRS) may be mapped, determining remaining RE as RE to which data are mapped, and demodulating the data using a precoding vector of a DRS corresponding to the MS. |
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Method for communication in mimo network Invention relates to wireless communication using a multiple-user multiple input, multiple output (MU-MIMO) system and discloses a method for communication in a network including a primary station and at least a first secondary station, wherein the first secondary station transmits to the primary station an indication of a first set of precoding vectors, and the number of first precoding vectors is greater than a preferred rank of transmission from the primary station to the first secondary station. |
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Invention relates to a wireless mobile communication system and is intended to improve system performance by reducing signalling overhead. The method comprises steps of: setting a rank of uplink control information to a rank of uplink data; multiplexing a first control information item output from the control information with the data; channel interleaving the multiplexed output with control information other than the first control information item from said control information; and transmitting the interleaved signal. |
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Method and associated device for maintaining precoding channel coherence in communication network During precoding, channel coherence and system capacity are taken into account. A base station adjusts phase and/or amplitude of a precoding matrix corresponding to each precoded unit to maintain coherence of associated information of the entire precoding channel. The associated information of the precoding channel includes, for example, channel status information (CSI) or eigenvalue matrix of the precoding channel. Further, a mobile terminal performs channel estimation based on reference signals of multiple precoded units, thereby eliminating the limitation in prior art that a mobile terminal can perform channel estimation only within one or more resource blocks limited by a precoding granularity. |
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Method for calibration and beam formation in radio communication system Radio communication method includes periodic calibration in each calibration interval to obtain a Node B calibration vector, wherein periodic calibration involves selecting a group of user equipment UE for calibration, and groups of UE are selected based on channel quality indicators (CQI) received from said UE; and forming a beam pattern for at least one UE in each calibration interval and applying said calibration vector, obtained for said calibration interval in which periodic calibration involves, in each calibration interval, calculation of at least one initial calibration vector for each UE in the selected group, and calculation of a Node B calibration vector based on the initial calibration vectors for all UE in the selected group. |
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Antenna virtualisation in wireless communication environment Set of physical transmit antennae can be divided into a plurality of groups of physical transmit antennae. Further, a precoding vector for a particular group of physical transmit antennae from the plurality of groups of physical transmit antennae can be formulated. Furthermore, the particular group of physical transmit antennae can form a particular virtual antenna. By way of another example, another precoding vector for another group of physical transmit antennae from the plurality of groups of physical transmit antennae can be formulated, and the other group of physical transmit antennae can form another virtual antenna. The precoding vector can be applied to a signal for transmission over the particular virtual antenna, and the other precoding vector can be applied to another signal for transmission over the other virtual antenna. |
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Method and apparatus for transmitting correction code in wireless communication system Invention discloses a method and an apparatus for transmitting a correction code in a wireless communication system. A base station (BS) generates a correction code sequence for each of a plurality of antennae and transmits the correction code sequence to user equipment for each antenna. The location of a subcarrier to which each correction code sequence is mapped is determined based on a frequency reuse factor (FRF). |
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Uplink open-loop spatial multiplexing in wireless communication Precoders are cycled according to a precoder sequence for each data symbol transmission. When the last precoder is selected the cycle can begin again, a new precoder sequence can be received or defined. A precoder sequence related to a subset of precoders present in a wireless device is defined sequentially, cyclically shifted according to an identifier or one or more communication parameters, randomly, pseudo-randomly according to an identifier or one or more communication parameters. In addition, the precoder sequence can be utilised to select a precoder for one or more retransmissions. Such cycling of precoders can increase transmission diversity. |
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Adaptive compression of feedback channel based on second order channel statistics Method involves determining individual statistics for a plurality of channel tap coefficients of a communication channel between a transmitting station and a receiving terminal; and individually quantising said plurality of channel tap coefficients at corresponding quantisation bit rates which are determined based on said statistics to generate quantised channel tap coefficients, wherein the total number of bits allocated to said plurality of channel tap coefficients is fixed; and transmitting said quantised channel tap coefficients from the receiving terminal to the transmitting station. |
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Reference signal design for lte a Invention discloses systems and methodologies which facilitate creating antenna ports which correspond to two or more groups of user equipment (UE). The present invention can organise two or more groups of user equipment and signal to each of the two or more groups a respective antenna port. The invention can further transmit mapping information, a reference signal or delay related to a linear combination in order to identify antenna ports. Based on such transmitted information, the reference signal can be decoded in order to identify each antenna port. |
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Method and apparatus for controlling multi-antenna transmission in wireless communication network Multi-antenna transmission control presented herein involves generating a set of virtual channel realisations in a transmitter (10) which shares the same second-order statistics as the actual channel realisations observed for a targeted receiver (12). By making the control-related quantities of interest at the transmitter (10) depend on the long-term statistics of the channel, the actual channel realisations are not needed for transmission control, e.g., for accurate multiple-input/multiple-output (MIMO) precoding and the related modulation and coding choice. |
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Method of and device for transfer of information on antenna configuration Information on antenna configuration and/or a circuit of transfer spreading may be transferred by means of an appropriate display of a physical broadcasting channel to a subframe so that reference signals indicate various configurations of an antenna or a circuit of transfer spreading. Alternatively, masking, such as masking with use of a cyclic excessive code of control, may be applied for provision of information on configuration of an antenna and/or a circuit of transfer spreading. |
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Method and apparatus for conveying antenna configuration information via masking Invention relates to interaction between a network entity, such as a base station, and a recipient, such as mobile terminal, and can be used to convey antenna configuration information. The method of providing antenna configuration information via masking involves: selecting a bit mask associated with an antenna configuration and a transmission diversity scheme, the bit mask being selected from a set of bit masks including a first bit mask associated with a single-antenna configuration, a second bit mask associated with a two-antenna configuration, and a third bit mask associated with a four-antenna configuration, wherein selecting the bit mask involves selecting the bit mask from the set of bit masks, the first bit mask having a maximum Hamming distance from the second bit mask; and applying the bit mask associated with the antenna configuration and the transmission diversity scheme to a set of predetermined bits within a plurality of bits. |
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Basic station, user device and method of signal transmission used in mobile communication system Invention relates to a basic station, a user device and a method used in mobile communication systems using ASTD (Antenna Switching Transmit Diversity) with a feedback. A basic station comprises a storage unit arranged as capable of storing data on quality reflecting conditions of a channel for various transmitting antennas of a user device in a preset frequency band comprising several elements of resources; a planning unit arranged as capable of planning data generation reflecting assignment of resources elements on the basis of quality data; and a transfer unit arranged as capable of transfer of a low-level control signal to a user device, including planning data and antenna selection information. Antenna selection information specifies those transmitting antennas of a user device, which shall be used for transfer. Planning information and antenna selection information jointly go through channel coding. |
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Beam control and beam generation for wideband mimo/miso systems Invention may be used to send data in communication systems with multiple inputs and multiple outputs or with multiple inputs and one output (MIMO/MISO). The method to process data for transfer along a wideband multi-input channel consists in receiving a control vector for each of multiple subranges, at the same time each control vector comprises multiple elements for multiple transmitting antennas, and in preliminary conversion of modulation symbols to be transferred in each subrange, using a control vector for a subrange, besides, the control vector for each subrange is received on the basis of its own vector corresponding to its main mode. |
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Setting maximum power in mobile communication system base station having multiple antennae MIMO-capable base station allocates a maximum transmission power resource to each of its antennae. For serving each of one or more MIMO and non-MIMO users, one or more carriers are allocated. For each carrier, information about the amount of allocated MIMO and non-MIMO user resources associated with the carrier is used to derive coefficients. For each carrier, the coefficients and the maximum transmission power resource for the carrier are used to derive a maximum transmission power resource for each of the antennae. For each antenna, a total maximum transmission power resource is derived. If it is determined that the total maximum transmission power resource of the antenna exceeds the transmission power limit for the antenna, and radio conditions for a non-MIMO user satisfy one or more predefined criteria, then one of the secondary antennae of the carrier is used to serve the non-MIMO user. |
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Techniques for efficiently sending channel state information using differential encoding are described. Differential encoding may be performed across space, across frequency, across space and frequency, across space, frequency and time, or across some other combination of dimensions. In one design, spatial state information may be determined for multiple spatial channels on multiple subbands. The spatial channels may correspond to different antennae, different precoding vectors, etc. Channel quality indicator (CQI) values may be obtained for the multiple spatial channels on the multiple subbands. The CQI values may be differentially encoded across the multiple spatial channels and the multiple subbands to obtain differential CQI information. In another design, CQI values may be obtained for multiple spatial channels on the multiple subbands in multiple time intervals and may be differentially encoded across space, frequency and time. The differential CQI information and the spatial state information may be sent as feedback. |
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Calculation of antenna weights based on capabilities to weaken noise by users Components of noise signals for reception units different from a final reception unit, and a desired communication signal in a final reception unit are weighed with the help of parameters determined for a receiver, which describe capabilities of the receiver for the specified units in terms of their resources for suppression of noise and/or improvement of signals. The invention also relates to the method and device of planning for planning of the user equipment with the help of using the specified information by capabilities of signals processing for received signals of each reception unit. |
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Transformed structure for based on cyclic delay diversity precoding Data vectors to be transferred to multiple receiving antennas of receiver can be transformed into virtual antenna area. CDD can be applied to this area with subsequent precoding to provide benefits of prcoding while CDD is used. Therein, resulting signals can be transmitted without useless dispersion of spatial transmission energy, which is unreachable by receiving devices. |
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In one version of implementation, the method comprises realisation of adaptive beam control using multiple transmitting and receiving antennas including iterative realisation of training sequences pair, where a pair of training sequences includes evaluation of transmitter array weighting vector and receiver array weighting vector. |
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Beam forming with transmission space-time coding and diversity Transmission signal undergoes space-time coding on a plurality of space-time antenna groups, wherein each space-time antenna group is associated with a particular space-time code. Based on each signal in each space-time antenna group, a beam is formed for a plurality of antennae in the given space-time antenna group. Each antenna in the plurality of antennae in the space-time antenna group is assigned a separate weight coefficient relative the other antenna in that space-time group. Each weight coefficient can have defined amplitude, phase or a combination of amplitude and phase. The weight coefficients can be static or dynamic. For dynamic coefficients, the amplitude, phase or combination of amplitude and phase can vary with time. |
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Cyclic delay diversity and precoding for wireless communication Techniques for sending a MIMO transmission using a combination of cyclic delay diversity and precoding are described. A set of delays (e.g., zero delay, small delay, and large delay) for cyclic delay diversity and a set of precoding matrices may be supported. In one design, a Node B may select a delay specifically for user equipment (UE) or for a set of UE served by the Node B. In another design, UE may evaluate different combinations of precoding matrix and delay, determine the combination with the best performance, and send that combination of precoding matrix and delay to Node B. Node B may perform precoding with the precoding matrix and then processing for cyclic delay diversity based on the selected delay. Alternatively, Node B may perform processing for cyclic delay diversity based on the selected delay and then precoding with the precoding matrix. |
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Mimo transmission with explicit and implicit cyclic delay Techniques for transmitting data using a combination of explicit cyclic delay and implicit cyclic delay are described. A transmitter may perform first processing for cyclic delay diversity (or explicit cyclic delay processing) based on a first set of cyclic delay values known to a receiver. The transmitter may perform precoding based on a precoding matrix either before or after the explicit cyclic delay processing. The transmitter may perform second processing for cyclic delay diversity (or implicit cyclic delay processing) based on a second set of cyclic delay values unknown to the receiver. The transmitter may perform both explicit and implicit cyclic delay processing for data and may perform only implicit cyclic delay processing for pilot signal. One object may select the first set of cyclic delay values and inform the other object. The transmitter may autonomously select the second set of cyclic delay values without informing the receiver. |
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Diversity scheme when transmitting with several antennae Method of transmitting data through several antennae involves modulating data into a plurality of modulated symbols, encoding each pair of modulated symbols from said plurality of symbols in accordance with the diversity scheme during transmission in order to obtain a plurality of 2×2 matrices, wherein each 2×2 matrix corresponds to each pair of modulated symbols, orthogonal expansion of the plurality of 2×2 matrices in order to form an output matrix, and transmitting symbols in the output matrix through a plurality of antennae using either a space-time diversity scheme during transmission or a space-frequency diversity scheme during transmission or a combination of the space-time and space-frequency diversity schemes during transmission. Density of resource elements used to transmit reference signals through the third antenna and the fourth antenna is less than density of resource elements used to transmit reference signals through the first antenna and the second antenna. |
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Method and apparatus for transmitting channel quality information in telecommunication system Mobile terminal device (400) is configured to receive a signal (404) from several transmitting antennae, wherein that signal includes several subcarriers (412), and determine channel quality indicator (CQI) messages, the format of transmitting messages for the set of carriers based on the selected configuration of transmitting antennae. The mobile terminal device is also configured to determine several CQI values (409) associated with said subcarriers in accordance with the determined format of transmitting CQI messages, and transmit these CQI values to a base station in a feedback signal (408). The format of transmitting CQI messages is adapted to the selected configuration of transmitting antennae such that the level of detail of transmitting CQI messages depends on the selected configuration of transmitting antennae. |
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System, apparatus, and method for asymmetrical beam-forming with equal-power transmission Invention provides a plurality of embodiments for beam-forming in asymmetrical system wireless communication systems (400) with NT transmitting antennae (102i) and NR receiving antennae (104j), where NT>NR, in which it is guaranteed that the transmission power on each antenna is the same, without appreciable loss in performance. Also, a technique is provided for choosing fewer beam-forming vectors than frequency bins in an orthogonal frequency-division multiplexing (OFDM) system. |
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Providing antenna diversity in wireless communication system Control signals can be received by a wireless terminal. Further, virtual antennae which can be supported by a channel can be identified based on control signal analysis. Also, channel quality information (CQI) calculations can be performed for each of the supported virtual antennae; further, CQI data can be sent to a base station for scheduling data transmission. Also, the base station can schedule transmission based on CQI data and/or fairness considerations. Scheduled data transmission can be performed by rotating the supported virtual antennae. |
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Mimo transmission with layer permutation in wireless communication system Techniques for supporting MIMO transmission with layer permutation are described. In one aspect, multiple codewords may be generated for transmission from multiple antennae (e.g., virtual antennae), the number of codewords being less than the number of antennae. Each codeword may be mapped across the multiple antennae. Two codewords may be generated. For rank 3, the first codeword may be mapped to one layer (or one antenna on each subcarrier), and the second codeword may be mapped to two layers (or two antennae on each subcarrier). For rank 4, each codeword may be mapped to two layers. In another aspect, a base CQI indicative of average signal quality may be determined. A delta CQI indicative of improvement over the average signal quality may also be determined. In yet another aspect, selection may be performed with different penalty factors for different ranks or number of codewords. |
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In one version indication of preliminary coding control (PCI), range and channel quality indication (CQI) for data transfer from a transmitter to a receiver may be determined by assessment of various assumptions. Based on PCI, the range and CQI a message may be generated. PCI may include a matrix or a vector of preliminary coding for use in data transfer. CQI may include at least one value of CQI at least for one transport unit for sending in the data transfer. The range and CQI may be combined on the basis of conversion. For instance, CQI may include one value of CQI and get into the first range of values, if the receiver prefers one transport unit. CQI may include two values of CQI and get into the second range of values, if both transport units are preferable. |
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Method and system to provide feedback for generation of beam in wireless communication systems Method to support beam generation includes stages, at which a testing request is received, and the first probing frame is sent in response to the testing request. Then the request is received for explicit feedback to generate a beam, the second probing frame is received, the explicit feedback is generated on the basis of the second probing frame, and the explicit feedback is sent in response to the explicit feedback. |
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Codeword permutation and reduced feedback for grouped antennae In a per group rate control MIMO system, a codeword can be linked to more than one layer. Codewords are mixed among antennae in the MIMO systems based upon a symmetric permutation of antenna groups. Further, codewords are transmitted in permuted form so that receivers can reduce feedback for a base channel quality indicator (CQI) and a differential CQI. Additionally, spatial diversity is increased for each codeword improving the robustness of the system against inaccurate CQI reports. |
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Space-time coding with beam formation based on channel quality feedback Transmission signal undergoes space-time coding on a set of space-time antenna groups, wherein each space-time antenna group is associated with a particular space-time code. The signal in each space-time antenna group undergoes beam formation on a set of antenna in the space-time antenna group. Each antenna in the set of antennae in the space-time antenna group is assigned a separate weighting coefficient relative the other antenna in that space-time group. Weighting coefficients for beam formation may vary depending on channel quality indication received from the receiver. The amplitude, phase or combination of amplitude and phase of each weighting coefficient or vector of the set of weighting coefficients may vary as a function of channel quality indication in order to improve quality of the received signal. |
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System (MIMO) employs precoding and feedback in a wireless communication system which includes a transmitter and a receiver. The system can use either a single code word (SCW) or a double code word (DCW). The precoding scheme is based on formation of directional patterns (TxBF). Combined differential and non-differential feedback with periodic resetting is provided. |
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Transfer of pilot-signal symbols in systems of wireless communication Symbols of pilot signal sent from antenna group corresponding to sector of basic station are multiplied by the first sequence from group of the first sequences having low mutual correlation with each other, and at least one second sequence from group of second sequences having low mutual correlation with each other. |
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Ofdm mimo system with controlled low-complexity directional diagram Transmitter station receives channel information for at least one subcarrier which is a subset of multiple subcarriers used to transmit data. Channel information can include at least one transmission control matrix, at least one set of eigen vectors, at least one channel response matrix, at least one channel covariance matrix, uncontrolled pilot signal or a controlled pilot signal for at least one subcarrier. The transmitter station receives at least one transmission control matrix for at least one subcarrier from the channel information and determines the transmission control matrix for each of the multiple subcarriers. The transmitter station controls transmission or controls the position of the directional pattern for each of the multiple subcarriers with the transmission control matrix for such subcarrier. |
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Methods and devices are disclosed, using information from at least all tracks of transmission from transmitter, to develop weight coefficients intended to generate directivity patterns of antenna for transmission. Besides methods and devices are disclosed, using information about channel, for instance information about of channel quality, weight coefficients of own directivity pattern of antenna and/or assessment of channel parametres to develop weight coefficients to generate directivity pattern of antenna. |
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Linear precoding for time division duplex transmission system Method of creating explicit and implicit feedback relating to a direct communication channel for linear precoding involves evaluation of the direct communication channel in order to form a matrix. Part of the matrix is quantised in order to give explicit feedback as a result, and the quantised data are transmitted over a feedback channel which provides implicit feedback which corresponds to the remaining part of the matrix. The implicit feedback is not identical to the explicit feedback and the implicit feedback provides information on part of the matrix which is different from the quantised part. |
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Method and device for selecting virtual antennas Every virtual antenna can be displayed on several or on all physical antennas with the help of various images. Efficiency of various combinations of at least one virtual antenna is estimated using one or more such parameters as signal quality, transmission capacity, total rate etc. Combination of virtual antennas with higher efficiency is selected to use. If virtual antennas are selected by receiving device then the data on channel state for selected combination of said antennas can be transmitted to transmitting device. Data on channel state can transfer information on selected virtual antenna (antennas), signal quality or rate (rates), one or more matrixes of pre-encoding used to form selected virtual antenna (antennas), and so on. Transmitting and/or receiving device can use selected virtual antenna (antennas) for data transmission. |
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Calibration of antenna matrix for multi-input-multi-output systems of wireless communication Substance of invention consists in calibration of antenna matrix of access point in wireless network, including stages of receiving the first channel estimates that correspond to transfers from access point to each of at least two antennas, at least two access terminals, detection of the second channel estimates that correspond to transfers from each of at least two antennas of at least two of specified access terminals to point of access, identification of calibration ratio on the basis of mentioned estimates and calibration of antenna matrix of access point by application of calibration ratio to transfer scale of access point. |
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Method and device for precoding in frequency-division duplexing system Receiver system selects a precoding matrix which contains weight coefficients for forming eigen-beams for use and provides matrix rank and index values associatively related to the selected matrix in the transmitter system. After receiving the matrix index and rank values, the transmitter system determines whether the matrix associatively related to the matrix index presented by the receiver system can be used. If not, the transmitter system selects another matrix to determine weight coefficients for forming eigen-beams. |
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Systems and methods for feedback beam formation in multiple antenna communication systems Invention relates to wireless communication and formation of eigen beams for wireless communication systems. Methods and devices are disclosed, which determine whether feedback information should be transmitted, as well as amount of feedback information regarding eigen beam information based on channel resources. Also disclosed are methods and devices which determine whether feedback information should be transmitted, as well as amount of feedback information regarding eigen beam information based on channel information and changes in channel information. |
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Calibration of antenna array for systems of wireless communication Calibration is realised for transmission channel of device that transmits information to multiple devices along lines of wireless communication, and channels of reception of multiple devices that receive information along one of wireless communication lines, using multiple estimates of direct communication line channel, received from at least some of multiple devices, and multiple estimates of reverse communication line channel from multiple devices. |
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Wireless communication device using adaptive beam formation Invention relates to wireless communication and more specifically to a wireless communication device which uses adaptive beam formation. The device has a processor, a radio-frequency (RF) transmitter which has a digitally controlled phased antenna array connected to and controlled by the processor for content transmission using adaptive beam formation, and a wireless communication channel interface connected to the processor so as to transmit antenna information relating to use of the phased antenna array, and to transmit information for assisting content reproduction in another location. |
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Method involves determination of weight coefficients corresponding to each antenna from several antennae used for transmitting data signals. Each weight coefficient is suitable for changing the corresponding data signal before transmission using the corresponding antenna; and transmission of information corresponding to at least one weight coefficient and enabling determination of at least the said weight coefficient. Another method involves receiving information corresponding to at least one of several weight coefficients corresponding to several first antennae used for transmitting first data signals, where each weight coefficient is used for changing the corresponding one of first data signals before transmission using the corresponding one of first antennae; using the received information to determine several weight coefficients corresponding to several first antennae, and using at least several weight coefficients to decode second data signals received using several second antennae to generate at least one output signal. |
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Notification on channel quality for adaptive sectorisation Invention relates to communication engineering and can be used in wireless communication networks. In the invention channel quality is monitored. Channel quality indicators can be used for selecting a dispatching method from several dispatching methods, including space-division multiplexing (SDM) and with multiple inputs and multiple outputs (MIMO) and dispatching methods with flexible formation of beams of a directional pattern. Also CQI can be used to determine the appropriate assignment of beams or renewal of beam formation diagrams. For one user device, the dispatching method is selected based on the first (CQI), and the second user device, dispatching is done at least partially based on the second CQI using a dispatching method different from the dispatching method for the first user device. |
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Transmission with incremental redundancy in mimo communication system Invention is intended for transmission with incremental redundancy (IR) in MIMO communication system. Transmitter unit processes (for example, codes, divides, alternates and modulates) data packages based on the selected speed to get multiple blocks of data symbols. Transmitter unit sends one block of symbols at a time, until receiver does not errorless restore data package, or until all the blocks are transmitted. Regardless of the time of acceptance of data symbol blocks from the transmitter unit, receiver detects accepted block of data symbols to get the detected block of symbols, processes (for example, demodulates, re-alternates, selects and decodes) all the detected blocks of symbols, received for the data package, and provides decoded package. If the decoded package contains an error, then the receiver repeats processing, while another block of symbols is being accepted for the data package. Receiver may as well perform repeated iterative detection and decoding on the accepted blocks of symbols for the data package to get a decoded package. |
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Invention relates to cellular communication systems. The method and device for managing resources in a wireless communication system through transmission to an access terminal of a control message for switching to a mode with several carriers, which instructs the access terminal to switch between a diversity reception mode, in which each antenna module from several antenna modules receives one carrier signal, transmitted at a single carrier frequency, and a several-carrier mode, in which the first antenna module from several antenna modules receives the first signal with several carriers, transmitted at the first carrier frequency, and the second antenna module receives second signals with several carriers, transmitted at the second carrier frequency. |
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Mobile communications method, mobile station and base station Separation of transmitting antennas with feedback is applied to special channel of downstream communications line, and separation of transmitting antennas without feedback is applied to control channel of downstream communications line in accordance with high-efficiency method of transmission over upstream communications line. The objective of present invention is to determine how the station with separation during transmission which implements advanced upstream communications line (EUL) should apply separation of transmitting antennas to level 1 confirmation information transmission channels (E-HICH), relative transmission rate channels (E-RGCH) and absolute transmission rate channels (E-AGCH). |
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Device and method for beams shaping in cdma communication system Invention is related to device and method for beams shaping in telecommunication system of mobile communication CDMA with application of intellectual antennas technology, using specified device and method, multiple fixed beams are shaped in sector, and multiple fixed beams are used to shape traffic channel with narrow beams and common channel with sector beams in one and the same intellectual antenna system, and problem of phases discrepancy is solved in appropriate channels due to differences in time and temperature oscillations without application of complicated correcting technology. Since fixed beams in some area correlate and interact with each other, or considerably weaken due to correlative summation of space vectors of every fixed beam in process of common channels transfer in CDMA system with multiple antennas, then appropriate ratio is established between power of pilot channel and traffic channel in coverage area, and signal-noise ratio is increased for signals received by mobile communication station. As a result of addition of optical transceivers system between system of the main frequency band and system of radio frequency transceivers (TRX), the main frequency band system services more sectors. Radio frequency unit is located in close proximity to antennas, and consumed power is reduced accordingly. |
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Present invention pertains to communication techniques. The transmitting object carries out spatial processing using control matrices, so that data transmission is held in a set of "effective" channels, formed on the real channel used for transmitting data, and control matrices, used for PRTS. Control matrices can be formed by sampling a base matrix, which can be a Walsh or Fourier matrix. Different combinations of scalars are then chosen, each combination of which consists of at least one scalar, of at least row of the base matrix. Each scalar can be a real or complex value. Different control matrices are formed by multiplying the base matrix by each of the different combinations of scalars. Control matrices are different transpositions of the base matrix. |
Another patent 2513469.