WO2008031359A1 - Dispositif de transmission de données - Google Patents

Dispositif de transmission de données Download PDF

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Publication number
WO2008031359A1
WO2008031359A1 PCT/CN2007/070655 CN2007070655W WO2008031359A1 WO 2008031359 A1 WO2008031359 A1 WO 2008031359A1 CN 2007070655 W CN2007070655 W CN 2007070655W WO 2008031359 A1 WO2008031359 A1 WO 2008031359A1
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WIPO (PCT)
Prior art keywords
layer
data
layers
transmitting
data streams
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PCT/CN2007/070655
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English (en)
Chinese (zh)
Inventor
Sheng Liu
Hufei Zhu
Yinggang Du
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008031359A1 publication Critical patent/WO2008031359A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H04B7/043—Power distribution using best eigenmode, e.g. beam forming or beam steering

Definitions

  • the present invention relates to the field of communications, and in particular, to a data transmitting apparatus.
  • the use of multiple antenna arrays at the transmitting and receiving ends of a communication system, or both ends, can greatly increase the transmission bit rate of the system.
  • MIMO Multi-Input Multi-Output
  • MIM0 has its irreplaceable point of view from the perspective of increasing system capacity or improving system performance. Superiority.
  • Figure 1 shows a wireless communication system with a space-time architecture using multiple antenna arrays at both the transmitting and receiving ends.
  • This system also known as the MIM0 (Multiple Input Multiple Output) system, operates in a Rayleigh scattering environment, and the elements of the channel matrix can be approximated as statistically independent.
  • a data sequence can be divided into M uncorrelated symbol subsequences, each subsequence being transmitted by one of the M transmit antennas.
  • the M subsequences are received by the N receiving antennas at the receiving end after being influenced by a channel whose channel matrix is H.
  • the transmitting signal, ⁇ can be transmitted through M different antenna units a1 , ⁇ , aM, and the corresponding receiving signals ⁇ ⁇ , ⁇ , Xjv are respectively from N different antenna units bl, ⁇ , bN receive.
  • the number M of transmitting antenna units is at least 2
  • the number N of receiving antenna units is at least M.
  • the channel matrix H is a matrix of NxM, and the elements of the i-th row and the j-column in the matrix represent the coupling of the i-th receiving antenna and the j-th transmitting antenna through the transmission channel.
  • the received signal ⁇ ⁇ , ⁇ , Xjv is processed in the digital signal processor to generate the recovered transmitted signal " ⁇ ,..., w.
  • cl, c-2, ⁇ are also shown in this figure.
  • cN which represent the unavoidable noise signals contained, ⁇ , -, Wn , which are respectively added to the received signals of the receiving antenna elements bl, b-2, ⁇ , bN.
  • a single code word (SCW) mode can be used.
  • the transmitting end uses M virtual antenna ports to transmit signals to the receiving end, and the M is greater than or equal to 2 and less than or equal to 4.
  • the M is greater than or equal to 2 and less than or equal to 4.
  • On a plurality of virtual transmitting antennas only one encoded data stream is transmitted at a time, and a plurality of symbol strings in the data stream are converted and then distributed to each virtual transmitting antenna for transmission.
  • the receiver At each TTI (Transition Time Interval), the receiver only feeds back a CQI (Channel Quality Indicator) information and an ACK (Acknowledgement)/NACK (Negative Acknowledgment) message, where
  • the CQI information tells the transmitting end which MCS (The modulation and channel coding scheme) is used for the data encoded by the corresponding TTI, and the ACK/NACK information tells the transmitting end that the corresponding TTI is in the corresponding TTI. Whether the transmitted encoded data has been correctly decoded by the receiving end.
  • MCS The modulation and channel coding scheme
  • the receiver may be a simple linear receiver, such as a known MMSE (Least Mean Square Error) equalizer (spacer), or a complex spatially multiplexed data.
  • MMSE Least Mean Square Error
  • spacer spacer
  • the receiving end feeds back the spatially multiplexed (Rank) K.
  • the transmitting end must use all available ⁇ at each moment in a ⁇ .
  • One of the transmitting antennas performs spatial multiplexing Transmission;
  • the transmitting end alternately uses all of the transmitting antennas, that is, using each transmitting antenna in turn, instead of using only one of the fixed ones. For example, there are 4 transmitting antennas at the transmitting end, 1, 2, 3, and 4.
  • the transmitting end divides the data to be transmitted into multiple data packets (Block), channel coding and interleaving the information bits in the same data packet, and then modulating Multiple symbols are transmitted over the channel, and the length of time required to transmit such a packet determines the length of one TTI.
  • the receiving end first receives all the symbols contained in the same data packet, and then deinterleaves and decodes.
  • a TTI refers to the time interval at which such a packet is transmitted.
  • each symbol in a data packet transmitted in a TTI may be distributed in different intervals in the time domain, or in different intervals in the frequency domain, or in different two-dimensional planes in the time domain and the frequency domain.
  • a symbol period described herein refers to an interval occupied by a symbol transmitted through a channel in the time domain, or an interval occupied in the frequency domain, or an interval occupied in a two-dimensional plane in the time domain and the frequency domain.
  • one packet uses eight OFDM (orthogonal frequency division multiplexing) in the time domain.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the receiving end feeds back a CQI message, and tells the transmitting end that after the corresponding TTI transmission is encoded.
  • the MCS The modulation and channel coding scheme
  • the current common method is to make all the modulation and coding schemes (MCS) supported by the transmitting antenna into one table.
  • MCS modulation and coding schemes
  • Table 1 A common example is shown in Table 1, which is stored at the transmitting end and the receiving end.
  • the receiving end calculates a Signal to Interference and Noise Ratio (SINR) according to the channel condition, and determines which MCS can be supported by the current channel condition from the calculated SINR, and then feeds back the index of the MCS.
  • SINR Signal to Interference and Noise Ratio
  • Table 1 MCS Mapping Table
  • the data stream to be transmitted is first subjected to operations such as channel coding, channel interleaving, rate matching, and constellation mapping, and then the data streams of the same rate of K channels are respectively transmitted through different antennas (K is less than or equal to M). And M is the number of transmitting antennas).
  • the receiving end calculates the average received SINR of all transmitting antennas (which may be virtual transmitting antennas), and checks the MCS index table to feed back the index of the MCS that the transmitting end should adopt.
  • the data stream to be transmitted adopts a unified channel encoder, RM (Rate Matching) mode and modulation mode, and then all the data is equally divided into antennas, and corresponding processing is performed. Go out.
  • the data of the M transmit antennas occupy the same channel code or channel resources such as frequency or time.
  • the channel coding module 202 is a Turbo code of 1/5 code rate.
  • the channel interleaving module 204 includes two sub-modules, which are bit separation and bit permutation, respectively.
  • the rate matching module 206 punctates or repeats the sequence sent as needed.
  • the splitter 208 transmits the sequence after the rate matching to each antenna according to a certain rule. In the existing SCW, information bits in the sequence are equally distributed to the respective antennas.
  • the modulation module 210 includes two sub-modules, a constellation mapping module 210a and a channelization processing module 210b, wherein the constellation mapping includes modulation schemes such as BPSK, QPSK, 8PSK, eagle M, and 64QAM, and channelization processing includes OFDM or spread spectrum. Etc., as well as multiple transmit modules, can be antennas.
  • the information sequence in the SCW system (ie, the data stream to be transmitted) is split after encoding, interleaving, and rate matching, and each antenna transmits equal information bits when splitting, that is, the information sequence is equally divided into each On the antenna, after adding the check sequence, it enters the channelization processing module and sends it out, as shown in Figure 3.
  • the bits indicated by the slanted grids are information bits
  • the bits indicated by the grid are check bits.
  • the antennas with smaller SINR will have more errors, especially the SI setting.
  • the information bit error on a small antenna can seriously affect the performance of the entire system, and the throughput of the system is bound to be lost.
  • the receiving signal-to-noise ratio of each transmitting antenna at the receiving end is usually different.
  • the same modulation method is adopted, and the receiving signal-to-noise ratio is not fully utilized.
  • the transmitting antenna with high signal-to-noise ratio is high-order.
  • the modulation mode, and the transmitting antenna with low signal-to-noise ratio is low-order modulation.
  • the channel matrix of MIM0 changes with time, so at each moment, the size of the received signal-to-noise ratio of each transmitting antenna at the receiving end and the relative size of each other change, so if the receiving signal-to-noise ratio at the receiving end is to be used according to each transmitting antenna.
  • the size of each transmitting antenna is appropriately modulated in each transmitting antenna, and feedback is usually required.
  • the receiving end notifies the transmitting end, and which type of modulation is suitable for each antenna of the transmitting end.
  • the disadvantage of this method is that it requires feedback and is expensive to use.
  • MCW multi-codeword
  • the law can also be extended to multi-codeword mode.
  • the multi-codeword mode is introduced below.
  • a multi-codeword mode can be used.
  • the transmitting end uses M virtual antenna ports to transmit signals to the receiving end, and the M is greater than or equal to 2 and less than or equal to 4.
  • the M is greater than or equal to 2 and less than or equal to 4.
  • K K is less than or equal to M
  • each path of the K channel data stream is divided and transmitted to each virtual transmitting antenna.
  • the receiving end feeds back one CQI (Channel Quality Indicator) information and one ACK/NACK information, wherein the CQI information tells the transmitting end which of the encoded data in each of the corresponding ones of the transmissions is used.
  • An MCS Modulation and Channel Coding Scheme
  • the ACK/NACK information tells the transmitter whether each encoded data in the corresponding one of the transmitted transmissions has been correctly decoded by the receiving end.
  • the receiver can be a simple linear receiver or a complex nonlinear receiver using interference cancellation technology, and for the multi-codeword mode, the interference cancellation technique can be used to obtain a large gain, so
  • the codeword mode typically uses a non-linear receiver for interference cancellation.
  • the receiver In the MCW mode, the receiver feedbacks ⁇ ( ⁇ less than or equal to ⁇ ) CQIs, respectively indicating the MCS of the K-coded data stream.
  • ⁇ ⁇ less than or equal to ⁇
  • CQIs CQIs
  • Each path in the K-coded data stream is fixed to a virtual antenna (ie layer) or physical antenna transmission.
  • the data stream to be transmitted is first split into K-paths, and then each channel is subjected to channel coding, channel interleaving, rate matching, and constellation mapping, and then transmitted through the antenna (K is less than or equal to M). And M is the number of transmitting antennas).
  • K is less than or equal to M
  • M is the number of transmitting antennas.
  • each channel can be fixed to one antenna for transmission, or by alternate, each channel is transmitted through all the transmitting antennas in all symbol periods of one TTI.
  • the receiving end calculates the received SINR of each channel, and checks the index of the MCS that should be used by each channel of the MCS index table.
  • the receiving end uses the interference cancellation receiver, the calculation of the received SINR needs to consider the gain of interference cancellation.
  • the left side of the column vector composed of the transmitted signals is multiplied by a matrix and then sent to each Launch on a physical antenna.
  • each transmitted signal is multiplied by a column in the matrix, and each result obtained is sent to each physical antenna separately.
  • the layer is equivalent to One beam or one virtual antenna.
  • the invention provides several data transmitting devices, which can fully utilize the statistical rule of the relative size of the signal-to-noise ratio of the transmitting module at the receiving end, without requiring feedback from the receiving end, thereby saving system resources.
  • the object of the invention is achieved by the following technical solutions:
  • a data transmitting device includes:
  • a plurality of transmitting modules configured to transmit a data stream using a pseudo-feature beamforming technique in a TDD mode; and a data processing module for processing the data stream to be sent, and allocating the processed data stream to one or a plurality of layers, the one or more layers then allocating the data stream to the plurality of transmitting modules, wherein a number of information bits allocated to a layer using the pseudo eigenbeamforming technique is greater than information allocated to other layers The number of bits.
  • a data transmitting device includes:
  • a plurality of transmitting modules configured to transmit a data stream using a pseudo-feature beamforming technique in a TDD mode; and a data processing module for processing the data stream to be sent, and allocating the processed data stream to one or a plurality of layers, the one or more layers then distributing the data stream to the plurality of transmitting modules, wherein a layer using the pseudo eigenbeamforming technique uses a modulation method that is higher than a modulation mode used by other layers or Multi-order.
  • a data transmitting device includes:
  • a data processing module configured to process the data stream to be sent, and distribute the processed data stream to the one or more layers, where the one or more layers then allocate the data stream to the plurality of a transmitting module, where the precoding matrix has M columns, each column corresponds to one layer, and the number of information bits allocated to at least one layer in the precoding mode is greater than the information bits allocated to other layers except the at least one layer. number.
  • a data transmitting device includes:
  • a data processing module configured to process the data stream to be sent, and distribute the processed data stream to the one or more layers, where the one or more layers then allocate the data stream to the plurality of And a transmitting module, wherein at least one layer of the precoding mode uses a modulation mode that is higher than an order of a modulation mode of the layers other than the at least one layer.
  • a data transmitting device includes:
  • a data processing module configured to separately process one or more data streams to be sent, and distribute the processed one or more data streams to each layer, where the layers further allocate the data streams to the A plurality of transmitting modules are described, wherein each of the data streams uses the respective layers in a round-robin manner, and for each data stream, information bits are allocated as much as possible to a layer using pseudo-feature beamforming techniques.
  • a data transmitting device includes:
  • a data processing module configured to separately process one or more data streams to be sent, and distribute the processed one or more data streams to the respective layers, where the layers further allocate the data streams Giving the plurality of transmitting modules, wherein the one or more data streams use the respective layers in a round-robin manner, and each of the data streams is in a layer using pseudo-feature beamforming techniques
  • the modulation method used is one or more orders higher than the modulation method used by the data stream in other layers.
  • a data transmitting device includes:
  • Multiple transmit modules for transmitting one or more data streams in precoding mode
  • a data processing module configured to separately process one or more data streams to be sent, and distribute the one or more data streams to the respective layers, where each layer further allocates the data stream to the Transmitting, by the plurality of transmitting modules, wherein the one or more data streams use the respective layers in a round-robin manner, and for each of the data streams, the number of information bits allocated to at least one layer in the precoding mode is greater than The number of information bits allocated to layers other than the at least one layer.
  • a data transmitting device includes:
  • Multiple transmit modules for transmitting one or more data streams in precoding mode
  • a data processing module configured to separately process one or more data streams to be sent, and distribute the one or more data streams to the respective layers, where each layer further allocates the data stream to the Transmitting, by the plurality of transmitting modules, wherein the one or more data streams use the respective layers in a round-robin manner, and for each data stream, at least one layer of the precoding mode uses a modulation mode higher than The order of the modulation scheme used by the layers other than the at least one layer.
  • a data transmitting device includes:
  • a data processing module configured to separately process one or more data streams to be sent, and distribute the one or more data streams to the respective layers, where each layer further allocates the data stream to the Transmitting by a plurality of transmitting modules, wherein the one or more data streams are fixedly used by one layer, and the data transmission rate of the modulation and channel coding scheme used by the layer using the pseudo eigenforming technique is higher than that of the other layers.
  • the data transmission rate with the channel coding scheme configured to separately process one or more data streams to be sent, and distribute the one or more data streams to the respective layers, where each layer further allocates the data stream to the Transmitting by a plurality of transmitting modules, wherein the one or more data streams are fixedly used by one layer, and the data transmission rate of the modulation and channel coding scheme used by the layer using the pseudo eigenforming technique is higher than that of the other layers.
  • the data transmission rate with the channel coding scheme is configured to separately process one or more data streams to be sent, and distribute the one or more data streams to
  • a data transmitting device includes:
  • a data processing module configured to separately process one or more data streams to be sent, and distribute the one or more data streams to each layer, where each layer further allocates the data stream to the multiple
  • the transmitting module transmits, wherein the one or more data streams are fixedly used by one layer of transmission, respectively, and the power allocated to the layer using the pseudo-feature beamforming technology is higher than the power allocated to the other layers.
  • a data transmitting device includes:
  • Multiple transmit modules for transmitting one or more data streams in precoding mode
  • a data processing module configured to separately process one or more data streams to be sent, and distribute the one or more data streams to each layer, where each layer further allocates the data stream to the multiple a transmitting module, wherein the one or more data streams are fixedly used by one layer of transmission, and the data transmission rate of the modulation and channel coding scheme used by at least one layer in the precoding mode is higher than other layers except the layer The data transmission rate of the modulation and channel coding scheme used.
  • a data transmitting device includes:
  • Multiple transmit modules for transmitting one or more data streams in precoding mode; a data processing module, configured to separately process one or more data streams to be sent, and distribute the one or more data streams to each layer, the layers reassigning the data streams to the plurality of a transmitting module, wherein the one or more data streams are fixedly used by a layer of transmission, and at least one layer in the precoding mode is allocated more power than a layer other than the at least one layer power.
  • the transmitting end can fully utilize the statistical laws or laws of the relative magnitudes of the received signal to noise ratios of the known antennas, and allocate as many information bits as possible to the receiving signal to noise or The statistical average received signal and noise is better on the transmitting antenna, thereby saving system resources and improving system performance.
  • Figure 1 shows a wireless communication system with a space-time architecture using multiple antenna arrays at both the transmitting and receiving ends.
  • FIG. 3 is a diagram of bit allocation on each antenna in a single codeword system in accordance with the prior art
  • FIG. 4 is a block diagram of a data transmitting apparatus in accordance with the present invention. detailed description
  • FIG. 4 is a block diagram of a data transmitting apparatus in accordance with the present invention.
  • the data transmitting apparatus of the present invention comprises a plurality of transmitting modules, and the left side of the column vector composed of one or more transmitting signals is multiplied by a matrix, and then sent to the respective transmitting modules for transmission.
  • each transmitted signal is multiplied by a column in the matrix, and each obtained result is sent to each transmitting module separately, and we call this transmitting signal as a layer to transmit, the layer is equivalent to One beam or one virtual antenna.
  • a first data transmitting apparatus of the present invention includes: a plurality of transmitting modules for transmitting a data stream to a data receiving apparatus using a pseudo eigenbeamforming technique in a TDD mode; and a data processing module for the data stream to be transmitted Processing and distributing the processed data stream to one or more layers, which are then distributed to a plurality of transmitting modules, wherein the number of information bits allocated to the first layer using the pseudo-feature beamforming technique is greater than The number of information bits of other layers. More specifically, the first layer is allocated as many information bits as possible.
  • the first data transmitting apparatus of the present invention is applied to a single code word mode.
  • a second data transmitting apparatus of the present invention includes: a plurality of transmitting modules for transmitting a data stream to a data receiving apparatus using a pseudo eigenbeamforming technique in a TDD mode; and a data processing module for the data stream to be transmitted Processing and distributing the data stream to one or more layers, the layers being allocated for transmission by the plurality of transmitting modules, wherein the layer using the pseudo-feature beamforming technique (ie, the first layer) uses a modulation scheme other than The modulation used by the layer is higher or higher.
  • the data processing module allocates more power to layers using pseudo eigenbeamforming technology than to other layers.
  • the second data transmitting device of the present invention is applied to a single code word mode.
  • a third data transmitting apparatus of the present invention includes: a plurality of transmitting modules for transmitting a data stream to data in a precoding mode a receiving device; and a data processing module, configured to process the data stream to be sent and distribute the processed data stream to one or more layers, and the layers are further distributed to the plurality of transmitting modules, wherein the precoding matrix has M Columns, each column corresponding to a layer, the number of information bits allocated to at least one layer in the precoding mode is greater than the number of information bits allocated to layers other than the layer.
  • the third data transmitting apparatus of the present invention is applied to a single code word mode.
  • At least one layer may be one or more layers having a higher value of the received signal to interference ratio, and layers other than the layer may be all layers having a received signal to interference ratio lower than at least one layer. At least one layer may be one or more layers having a smaller serial number, and layers other than the layer may be all layers having a sequence number greater than the sequence number of at least one layer.
  • Information bits are allocated in such a way that as many information bits as possible are assigned to at least one layer and other layers than the layer. Wherein, the information bits can be allocated in the following manner: allocate as many information bits as possible to the first layer, and allocate as many information bits as possible to the second layer, . . . , BP, and sequentially put as much information as possible. The bits are assigned to the layer with the smaller sequence number.
  • a fourth data transmitting apparatus of the present invention includes: a plurality of transmitting modules for transmitting a data stream to a data receiving device in a precoding mode; and a data processing module for processing a data stream to be transmitted and streaming the data Allocating to one or more layers, which are then allocated to multiple transmitting modules for transmission, wherein at least one layer in the precoding mode uses an order of modulation higher than that of other layers except the layer. number. For example, the first layer 64QAM, the second layer 64QAM, the third layer 16QAM, and the fourth layer QPSK.
  • At least one layer may be one or more layers having a higher value of the received signal to interference ratio, and layers other than the layer may be all layers having a received signal to interference ratio lower than at least one layer. At least one layer may be one or more layers having a smaller serial number, and layers other than the layer may be all layers having a sequence number greater than the sequence number of at least one layer.
  • the data processing module allocates at least one layer of power higher than the power allocated to layers other than the layer.
  • the fourth data transmitting apparatus of the present invention is applied to a single code word mode.
  • a fifth data transmitting apparatus of the present invention includes: a plurality of transmitting modules, configured to transmit one or more data streams to a data receiving device using a pseudo eigen beam forming technique in a TDD mode, wherein each of the data streams is Modulation and channel coding separately; and a data processing module for processing one or more data streams to be transmitted and one or more data streams to respective layers, which are then distributed to multiple transmitting modules for transmission , where each data stream uses each layer in a round-robin manner. For each data stream, as many information bits as possible in the data stream are allocated to the first layer using pseudo-feature beamforming techniques.
  • the fifth data transmitting apparatus of the present invention is applied to the case of the multi-codeword mode b.
  • a sixth data transmitting apparatus of the present invention includes: a plurality of transmitting modules, configured to transmit one or more data streams to a data receiving device using a pseudo eigenbeamforming technique in a TDD mode, wherein each of the data streams is Modulating and channel coding separately; and a data processing module for processing one or more data streams to be sent separately, and allocating one or more data streams to each layer, and these layers are then allocated to multiple transmitting modules Transmitting, wherein one or more data streams use each layer in a round-robin manner, and each channel uses a modulation scheme that is higher in the first layer using the pseudo-feature beamforming technique than in the modulation mode used in other layers of the data stream. Or multiple orders. Wherein, for each data stream, the data processing module allocates more power to the first layer using the pseudo-feature beamforming technology than to the other layers.
  • the sixth data transmitting apparatus of the present invention is applied to the case of the multi-codeword mode 1).
  • a seventh data transmitting apparatus of the present invention comprises: a plurality of transmitting modules, configured to send one or more data streams to a data receiving apparatus in a precoding mode, wherein each of the data streams is separately modulated and channel encoded And data processing modules, One or more data streams to be processed are separately processed, and one or more data streams are allocated to each layer, and these layers are then distributed to multiple transmitting modules for transmission, wherein one or more data streams are rotated Use each layer.
  • the number of information bits allocated to at least one layer in the precoding mode is greater than the number of information bits allocated to at least one layer other than the layer, that is, first assigning as many information bits as possible to The first layer, in the allocation of the remaining information bits as much as possible to the second layer, . . .
  • the seventh data transmitting apparatus of the present invention is applied to the case b of the multi-codeword mode.
  • At least one layer is one or more layers having a higher received signal to interference ratio, and layers other than the layer are all layers having a received signal to interference ratio less than at least one layer. At least one layer is one or more layers having a smaller serial number, and layers other than the layer are all layers having a serial number greater than that of at least one layer. Information bits are allocated in such a way that as many information bits as possible are assigned to at least one layer and other layers than the layer.
  • An eighth data transmitting apparatus of the present invention comprises: a plurality of transmitting modules, configured to send one or more data streams to a data receiving apparatus in a precoding mode, wherein each of the data streams is separately modulated and channel encoded And a data processing module for processing one or more data streams to be sent separately, and allocating one or more data streams to each layer, and the layers are distributed to multiple transmitting modules, wherein, one way or Multiple data streams use each layer in a round-robin fashion.
  • at least one of the precoding modes uses a modulation scheme that is higher than the modulation scheme used by layers other than the layer.
  • the first data stream is in the first layer 64QAM, the second layer 64QAM, the third layer 16QAM, the fourth layer QPSK; and the second data stream is in the first layer 16QAM, the second layer 16QAM, the third layer QPSK, The fourth layer QPSK.
  • At least one layer may be one or more layers having a higher received signal to interference ratio, and layers other than the layer may be all layers having a received signal to interference ratio lower than at least one layer.
  • At least one layer may be one or more layers having a smaller sequence number, and layers other than the layer may be all layers having a sequence number greater than that of at least one layer.
  • the information bits are allocated in such a way that for each data stream, at least one layer in the precoding mode is allocated more power than is allocated by other layers than the layer.
  • the eighth data transmitting apparatus of the present invention is applied to the case of the multi-codeword mode b.
  • a ninth data transmitting apparatus of the present invention comprises: a plurality of transmitting modules, configured to transmit one or more data streams to a data receiving device using a pseudo eigen beam forming technique in a TDD mode, wherein each of the data streams is Modulating and channel coding separately; and a data processing module for processing one or more data streams to be sent separately, and allocating one or more data streams to each layer, and these layers are then allocated to multiple transmitting modules Emission, where one or more data streams are fixedly transmitted using a certain layer, and the data transmission rate of the MCS (modulation and channel coding scheme) used in the first layer using the pseudo eigenbeamforming technique is higher than that of the MCS used in other layers. Transmission rate.
  • MCS modulation and channel coding scheme
  • a tenth data transmitting apparatus of the present invention includes: a plurality of transmitting modules, configured to transmit one or more data streams to a data receiving device using a pseudo eigen beam forming technique in a TDD mode, wherein each of the data streams is Modulating and channel coding separately; and a data processing module for processing one or more data streams to be sent separately, and allocating one or more data streams to each layer, and these layers are then allocated to multiple transmitting modules
  • the transmission wherein one or more data streams are fixedly transmitted using a certain layer, respectively, and the power allocated to the first layer using the pseudo-feature beamforming technique is higher than the power allocated to the other layers.
  • the tenth data transmitting apparatus of the present invention is applied to the case of the multi-codeword mode a.
  • the ninth data transmitting apparatus described above can be used simultaneously with the tenth data transmitting apparatus.
  • An eleventh data transmitting apparatus of the present invention comprises: a plurality of transmitting modules, configured to send one or more data streams to a data receiving apparatus in a precoding mode, wherein each of the data streams is separately modulated and channeled Coded; and data processing module, One or more data streams to be sent are processed separately, and one or more data streams are allocated to each layer, and these layers are then allocated to multiple transmitting modules for transmission, wherein one or more data streams are fixedly used respectively.
  • a layer transmits, and the data transmission rate of the modulation and channel coding scheme used by at least one layer in the precoding mode is higher than the data transmission rate of the modulation and channel coding scheme used by layers other than the layer.
  • the case where the eleventh data transmitting apparatus of the present invention is applied to the multi-codeword mode a
  • At least one layer may be one or more layers having a higher value of the received signal to interference ratio, and layers other than the layer may be all layers having a received signal to interference ratio lower than at least one layer. At least one layer may be one or more layers having a smaller serial number, and layers other than the layer may be all layers having a sequence number greater than the sequence number of at least one layer. At least one layer in the precoding mode is allocated more power than is allocated by other layers than the layer.
  • a twelfth data transmitting apparatus of the present invention comprises: a plurality of transmitting modules for transmitting one or more data streams to a data receiving apparatus in a precoding mode, wherein each of the data streams is separately modulated and channeled And a data processing module for processing one or more data streams to be sent separately, and allocating one or more data streams to each layer, the layer being redistributed to multiple transmitting modules, wherein, one way Or the multiplexed data streams are fixedly transmitted using a certain layer, and at least one layer in the precoding mode is allocated more power than the other layers except the layer.
  • the twelfth data transmitting apparatus of the present invention is applied to the case of the multi-codeword mode.
  • At least one layer may be one or more layers having a higher value of the received signal to interference ratio, and layers other than the layer may be all layers having a received signal to interference ratio lower than at least one layer. At least one layer may be one or more layers having a smaller serial number, and layers other than the layer may be all layers having a sequence number greater than the sequence number of at least one layer.
  • the eleventh type of data transmitting apparatus described above can be used simultaneously with the twelfth type of data transmitting apparatus.
  • the higher order of the above modulation mode means that the number of bits of information carried by one symbol of the modulation mode is large.
  • the number of bits of information carried by one symbol of the three modulation modes of QPSK 16QAM and 64QAM is 2 respectively. 4 and 6, so it can be said that the order of 16QAM modulation mode is higher than QPSK, and the order of 64QAM modulation mode is higher than 16QAM.
  • the above MCS (Modulation and Channel Coding Scheme) has a high data transmission rate, which means that the number of data bits transmitted by the MCS is large when the number of symbols included in one packet is the same.
  • the MCS of the modulation mode 16QAM and the Turbo code rate of 3/4 has a data transmission rate higher than the MCS of the modulation mode QPSK and the Turbo code rate of 3/4, and is also higher than the modulation mode 16QAM and the Turbo code rate 1/2.
  • the present invention utilizes that in some cases, it is not necessary to feed back the transmitting end to know which of its transmitting antennas (transmitting modules) usually have a better receiving signal-to-noise ratio at the receiving end, which is based on the relative size of the transmitting module receiving the signal-to-noise ratio at the receiving end.
  • transmitting antennas transmitting modules
  • the present invention utilizes that in some cases, it is not necessary to feed back the transmitting end to know which of its transmitting antennas (transmitting modules) usually have a better receiving signal-to-noise ratio at the receiving end, which is based on the relative size of the transmitting module receiving the signal-to-noise ratio at the receiving end.
  • the base station utilizes the characteristics of the uplink and downlink channel symmetry in the TDD mode, and can estimate the downlink channel through the pilot transmitted by the uplink antenna of one mobile antenna of the mobile terminal, and the base antenna of the mobile terminal is used as the receiving antenna. Channels from each transmit antenna to the receive antenna.
  • the first layer uses the pseudo-feature beamforming technique, that is, the beamforming is performed by using the base station each transmitting antenna known by the base station through the symmetry to the channel of the receiving antenna of the mobile terminal. Then, the other layers are transmitted using beams orthogonal to the beam used by the first layer. This form of MIM0 transmission is called pseudo-eigen-beamforming.
  • the base station can transmit 2 layers of data to the mobile phone.
  • the receiver uses the ZF: Zero Forcing algorithm or the Minimum Mean-Square Error algorithm. It has been proved that if the receiving end uses the zero-forcing algorithm, even if it is assumed that the interference of the first layer data is perfectly eliminated when receiving the second layer data, it is assumed that the first layer is always correctly decoded, and the first layer data is received.
  • the statistical average of SNR1 is twice the statistical average of SNR2, and the simulation results show that the probability that SNR1 is greater than SNR2 is 75%, which is greater than 1/2.
  • ⁇ and r 2 are the received signals obtained by the two receiving antennas of the mobile phone, 3 ⁇ 4 and n 2 are noises, and ⁇ and h 2 are the channels of the base station transmitting antennas 1 and 2 to the mobile terminal receiving antenna 1, respectively, as described above.
  • ⁇ and h 2 have been obtained by the base station from the channel symmetry characteristic of the TDD mode
  • g 2 is the channel of the base station transmitting antennas 1 and 2 to the mobile terminal receiving antenna 2, respectively, and the base station does not know 81 and g 2 .
  • t ⁇ t 2 is a signal sent to the physical antenna, and the vector composed of the actual transmitted signal s ⁇ B s 2 is multiplied by the precoding matrix to obtain ⁇ and t 2 to be transmitted to the physical antenna.
  • the corresponding mathematical expression is as follows: Here, it is a precoding matrix.
  • the beamforming used in the first layer of data is the first and the first
  • the estimated value of the signal can be obtained from (3), and the received signal-to-noise ratio is
  • & and ⁇ 2 are statistically independent complex Gaussian random variables with a mean of zero, without loss of generality, assuming that the variance is a unit value of 1.
  • the expected value of the received signal-to-noise ratio is n.
  • T1 , t 2 , ⁇ , t M is the signal sent to the physical antenna, and the actual transmitted signal S1 , S2 , ⁇ , s M is multiplied by the precoding matrix to obtain ti, , ⁇ ⁇ , t M is sent to the physical antenna to transmit, the corresponding mathematical expression is as follows:
  • the beamforming vector used by the first layer data S1 is
  • the beamforming vector is a vector that is orthogonal to the beamforming vector used by the first layer of data. Therefore, the received signal of the first receiving antenna of the mobile phone only includes the result that the Sl reaches the first receiving antenna after forming the transmitting antenna beam of the base station, and the remaining 2, 3, ⁇ layer data: 32 , ss, ⁇
  • the beamforming vector used is not received by the first receiving antenna because it is orthogonal to the beamforming vector used by the first layer of data. Therefore, in the process of receiving Sl , it can be considered that there is no interference of other transmitted signals. In the process of receiving the remaining 2, 3, . . .
  • the received signal-to-noise ratio of ⁇ is much better than the received signal-to-noise ratio of S 2 , Ss, ⁇ .
  • the method of the invention is thus also applicable, i.e. to allocate as many information bits as possible to S1 .
  • the base station can transmit 4 layers of data to the mobile phone.
  • the received signal-to-noise ratio S of the first layer is set to be larger than the received signal-to-noise ratios SNR2, SNR3, and SNR4 of the other three layers because the first layer does not interfere when receiving, and the other three layers are receiving. It will interfere with each other, even if the interference of the first layer is completely eliminated when receiving. Therefore, while using the pseudo-feature beamforming technique of the TDD mode, as many information bits as possible can be allocated to the first layer.
  • the other case is the case of SCW using a precoding matrix.
  • the received signal-to-noise ratio of the layer corresponding to the first column of the precoding matrix is the best, the received signal-to-noise ratio of the layer corresponding to the second column is second, and the received signal-to-noise of the layer corresponding to the third column is relatively poor.
  • the layer corresponding to the fourth column has the worst received signal-to-noise ratio, so allocate as many information bits as possible to the first layer, then the second layer, and then the third layer.
  • the received signal-to-noise ratio of the m-th layer is also higher than the average of the m+1 layer by more than 3 dB, so it can be assumed that At the M layer, then at least one layer uses a modulation scheme that is higher in order than the other layers. More specifically, the number is 1, 2, 1, and M layers, then the first layer modulation mode is higher than or equal to the second layer, and the second layer modulation mode is higher than or equal to the third layer, one.
  • the above features are gradually increased, the first layer allocates more power than the second layer, and the second layer allocates more power than the third layer, ... to apply to the single codeword (SCW) mode.
  • SCW single codeword
  • the transmitting end makes full use of the known statistical law or law of the relative magnitude of the signal-to-noise ratio of each antenna, that is, in the case of two antennas, the statistical average result is: the first layer of the received signal-to-noise ratio
  • the mean is 3 dB larger than the second layer. Therefore, it is possible to always use a first-order or multi-order modulation method higher than the second layer in the first layer, for example, the second layer uses the QPSK modulation mode, the first layer uses the 16QAM modulation mode, and the second layer uses the 16QAM modulation mode, and the first layer uses the first layer. 64QAM modulation mode.
  • the solution of the present invention also allocates higher power to the first layer for two reasons:
  • the modulation methods used for data transmission are mainly QPSK, 16QAM and 64QAM.
  • the signal-to-noise ratio required by 16QAM is generally 5 dB higher than that of QPSK.
  • the signal-to-noise ratio required for 64QAM is generally 5 dB higher than that of 16QAM.
  • the average of the received signal-to-noise ratio of the first layer is only 3 dB greater than the received signal-to-noise ratio of the second layer. Therefore, by allocating more power to the first layer, the first layer of the received signal can be made.
  • the noise ratio is closer to 5 dB than the received signal-to-noise ratio of the second layer, so that the bit error rate of each bit transmitted through the channel after Turbo coding is relatively close at the receiving end.
  • the principle of Turbo code if the bit error rate of each bit after Turbo coding is relatively close at the receiving end, the overall packet error rate is small.
  • Water-Filling Theorem Allocating more power to a layer with higher reception signal and noise, the channel capacity can be larger.
  • MCS modulation and coding schemes
  • the data stream to be transmitted is first subjected to channel coding, channel interleaving, rate matching, etc., and then split into two bitstreams, and the two bitstreams respectively perform different constellation mapping (BP).
  • modulation For example, the bit stream transmitted by the first layer uses the 16QAM method for constellation mapping, and the bit stream transmitted by the second layer uses the QPSK method for constellation mapping), and the obtained symbol stream is transmitted through different layers
  • the number of transmitting antennas is also the number of layers.
  • the prior art refers to transmitting through different transmitting antennas.
  • the present invention uses different layers, because TDD is transmitted by different layers, and the layer is equivalent to one beam, which can be regarded as a virtual antenna).
  • the number of bits included in the bit stream transmitted by the above two layers is not the same, because one QPSK symbol can transmit 2-bit information, one 16QAM symbol can transmit 4-bit information, and one 64QAM symbol can transmit 6-bit information.
  • the symbol rate of each layer that is, how many symbols are transmitted, is the same.
  • the bit stream transmitted by the first layer is mapped by the 16QAM method and the bit stream transmitted by the second layer is mapped by the QPSK method
  • the receiving end calculates the respective received SINRs of the two layers of the starting end, thereby obtaining the average received SINR of the two layers, and checking the MCS index table (ie, Table 2).
  • the data stream to be transmitted at the transmitting end adopts a unified channel coder and RM (Rate Matching) mode, but each layer adopts different modulation modes, and then all the data is distributed to each layer, and corresponding processing is performed and then transmitted.
  • the data transmitted by the two layers occupy the same channel code or channel resources such as frequency or time.
  • the splitter divides the bit sequence after rate matching into each antenna according to a certain rule.
  • the two bit streams are respectively mapped through different constellations (such as the first layer).
  • the transmitted bit stream uses 16QAM for constellation mapping, while the second layer transmitted bit stream uses QPSK for constellation mapping), and the resulting symbol stream is transmitted through different layers.
  • the constellation mapping includes BPSK, QPSK, 8PSK, 16QAM, 64QAM (the standard is commonly used in QPSK, 16QAM, 64QAM).
  • SCW has less feedback in this way, and because there is only one channel encoder used, CRC The check is for the data on all transmit antennas, so the H-ARQ mechanism is relatively simple. Once the CRC check shows an error, all the data currently processed is retransmitted, and only one ACK/NACK signal is needed.
  • the SE minimum mean square error linear receiver
  • the simulation has been verified, the total power is unchanged, and the power of the first layer is twice the power of the second layer.
  • the channel capacity is at least not less than the channel capacity of the power average allocation scheme; and the simulation also proves that the power of the first layer is 1.19, and the power of the second layer is 0.77, and the average channel capacity is the largest.
  • Modulation mode b the bit stream transmitted by the first layer is modulated by 16QAM, and the bit stream transmitted by the second layer is modulated by QPSK, then the total number of bits transmitted on the antenna is 768, and the code rate is 1/3 (the present invention Unique method);
  • the transmitting end makes full use of the statistical laws or laws of the relative magnitudes of the received signal-to-noise ratios of the known antennas, and allocates as many information bits as possible to the received signal-to-noise ratio with better received signal-to-noise ratio or statistical average. Good on the transmitting antenna. This saves system resources and improves system performance.
  • the above technical solution can also be extended to MCW (multi-codeword mode).
  • MCW multi-codeword mode
  • TDD mode when using pseudo-eigen-beamforming technology, the above technical solution is also extended to MCW (multi-codeword mode); when using precoding technology, the above technical solution is also extended to MCW (multi-codeword mode).
  • the first layer of the TDD mode adopts a higher order modulation mode; when the precoding technique, the first layer modulation mode is higher than or equal to the second layer, and the second layer modulation mode is higher than or equal to the first Three layers, so recursively.
  • the first layer of the TDD mode allocates more power; in the precoding technique, the first layer power is higher than or equal to the second layer, and the second layer power is higher than or equal to the third layer, and thus recursively.
  • the first layer of the TDD mode is simply assigned a higher power; in the precoding technique, the first layer power is higher than or equal to the second layer, and the second layer power is higher than or equal to the third layer. , so recursively. This will have gain, because by the Water-Filling theorem, this can increase the channel capacity, and each layer is adaptively modulated, so it can reach the maximum MCS it can accept for receiving SINR. 4.
  • the first layer of the TDD mode uses the MCS with a higher data transmission rate; when the precoding technology, the data transmission rate of the MCS of the first layer is higher than or equal to the second layer, and the MCS of the second layer The data transmission rate is higher than or equal to the third layer, and thus recursively.
  • the first layer of the TDD mode is fixedly allocated more power; when the precoding technology is used, the first layer power is higher than or equal to the second layer, and the second layer power is higher than or equal to the third layer, and thus recursively.
  • the MCS of the higher data transmission rate refers to more information transmitted under the MCS.
  • the MCS of the 16QAM 2/3 code rate transmits more information than the MCS of the QPSK 2/3 code rate, and is more than the 16QAM 1
  • the MCS of /2 code rate, that is, the modulation mode is the same and the code rate of the turbo code is higher to achieve a higher data transmission rate.
  • the effect of reducing the feedback amount of the MCW can be achieved.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne une petite quantité de dispositifs de transmission de données dans lesquels, le premier dispositif de transmission de données comprend: plusieurs modules d'émission (2) utilisés pour transmettre un train de données à un dispositif recevant des données avec une technique de formation de faisceau pseudo-propre en mode TDD; et un module de traitement des données (1) utilisé pour traiter le train de données à transmettre et affecter à une ou plusieurs couches le train de données traité, les couches l'affectant alors à plusieurs modules d'émission (2) de façon à l'émettre, le nombre de bits d'information affectés aux couches avec la technique de formation de faisceau pseudo-propre étant supérieur au nombre de bits d'information affectés aux autres couches. En l'occurrence, le dispositif de transmission de données comporte de l'application en mode de mot de code de signal. Le dispositif de transmission de données de l'invention peut utiliser une règle statistique de la quantité relative du rapport signal bruit reçu au niveau de l'extrémité réception par les modules d'émission (2) au complet, plutôt que de demander du retour d'information de l'extrémité réceptrice, et économiser de la ressource système.
PCT/CN2007/070655 2006-09-08 2007-09-07 Dispositif de transmission de données WO2008031359A1 (fr)

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CN105830411B (zh) * 2013-12-27 2020-03-13 松下电器（美国）知识产权公司 发送方法、接收方法及发送装置、接收装置
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