WO2010109635A1 - マルチアンテナ通信装置及びマルチアンテナ通信方法 - Google Patents
マルチアンテナ通信装置及びマルチアンテナ通信方法 Download PDFInfo
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- 238000012937 correction Methods 0.000 claims description 12
- 238000003786 synthesis reaction Methods 0.000 claims description 12
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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
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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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0042—Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
- H04L1/0051—Stopping criteria
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- H—ELECTRICITY
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0064—Concatenated codes
- H04L1/0066—Parallel concatenated codes
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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- H—ELECTRICITY
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0637—Properties of the code
- H04L1/0656—Cyclotomic systems, e.g. Bell Labs Layered Space-Time [BLAST]
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- H—ELECTRICITY
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- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability
Definitions
- the present invention relates to a multi-antenna communication apparatus and a multi-antenna communication method.
- MIMO Multi Input Multi Output
- a transmission apparatus in MIMO transmits different data simultaneously from a plurality of transmission antennas, it is theoretically possible to transmit data that is several times the number of transmission antennas as compared with a transmission apparatus having one transmission antenna.
- a receiving apparatus in MIMO receives data from a plurality of receiving antennas, and performs a matrix operation, for example, to separate data transmitted from each transmitting antenna.
- the transmission apparatus performs precoding that preliminarily applies reverse characteristics of the channel characteristics to data transmitted from each transmission antenna. Specifically, when CSI (Channel State Information) indicating channel characteristics is fed back from the receiving apparatus to the transmitting apparatus, the transmitting apparatus compensates for deterioration in reception quality caused by the channel characteristics estimated from the CSI. Precoding using a codebook is performed.
- CSI Channel State Information
- an object of one aspect is to reduce the error rate of received data.
- the information data is mapped to the first layer among the plurality of layers corresponding to the plurality of antennas, and the information data mapped to the first layer and a part thereof are mapped to the second layer.
- a mapping unit that maps information data that overlaps and partially differs, and generates transmission data for each layer by encoding the information data mapped to the first layer and the second layer by the mapping unit
- An encoding unit and a transmission unit configured to transmit transmission data for each layer generated by the encoding unit from an antenna corresponding to each layer.
- a reception processing unit that receives data of a plurality of layers in which part of mapped information data overlaps and partly differs, and separates the received data into layer-specific data for each layer
- a decoding unit that decodes the layer-by-layer data obtained by being separated by the reception processing unit to generate a soft decision value for each layer, and a soft decision value for each layer that is generated by the decoding unit
- a synthesizer that synthesizes soft decision values corresponding to information data mapped in duplicate on a plurality of layers, and a deciding unit that makes hard decision on layer-specific data using the soft decision values synthesized by the synthesizer And have.
- the information data is mapped to the first layer among the plurality of layers corresponding to the plurality of antennas, and the information data mapped to the first layer is mapped to the second layer.
- Mapping step for mapping information data partially overlapping and different in part, and transmission data for each layer by encoding the information data mapped to the first layer and the second layer in the mapping step
- a transmission step of transmitting transmission data for each layer generated in the encoding step from an antenna corresponding to each layer is
- a reception processing step of receiving data of a plurality of layers in which a part of mapped information data is overlapped and partly different, and the received data is separated into layer-specific data for each layer A decoding step for decoding the layer-by-layer data obtained by being separated in the reception processing step to generate a soft decision value for each layer, and a soft decision value for each layer generated in the decoding step
- FIG. 1 is a block diagram illustrating a configuration of a transmission apparatus according to an embodiment.
- FIG. 2 is a block diagram showing a configuration of a receiving apparatus according to an embodiment.
- FIG. 3 is a diagram illustrating a specific example of cross-layer mapping.
- FIG. 4 is a diagram illustrating specific examples of the original packet and the auxiliary packet.
- FIG. 5 is a flowchart showing a receiving operation of the receiving apparatus according to the embodiment.
- FIG. 6 is a diagram illustrating a specific example of energy synthesis of data.
- FIG. 7 is a diagram illustrating a specific example of soft decision value synthesis.
- FIG. 8 is a diagram illustrating a specific example of iterative decoding.
- FIG. 1 is a block diagram illustrating a configuration of a transmission apparatus according to an embodiment.
- FIG. 2 is a block diagram showing a configuration of a receiving apparatus according to an embodiment.
- FIG. 3 is a diagram illustrating a specific example of cross-layer mapping.
- FIG. 9 is a diagram illustrating a specific example of the relationship between the reception quality and the error rate.
- FIG. 10 is a diagram illustrating another specific example of cross-layer mapping.
- FIG. 11 is a diagram illustrating still another specific example of the cross layer mapping.
- FIG. 12 is a diagram illustrating still another specific example of the cross layer mapping.
- FIG. 1 is a block diagram showing a configuration of a transmission apparatus according to the present embodiment.
- the transmitting apparatus shown in the figure includes a cross-layer mapping unit 101, CRC (Cyclic Redundancy Check) adding units 102-0 to 102-3 as an example of error detection coding, and a turbo code as an example of error correction coding.
- CRC Cyclic Redundancy Check
- a layer corresponding to the CRC adding unit 102-0, the turbo encoding unit 103-0, the modulating unit 104-0, and the antenna 106-0 is referred to as “layer 0”.
- the cross-layer mapping unit 101 maps the information bits into a total of four layers by dividing and combining these information bits. Specifically, the cross layer mapping unit 101 maps, for example, information bits corresponding to input two-layer packets to layer 0 and layer 1, respectively. That is, layer 0 and layer 1 are layers in which input information bits are mapped as they are.
- the cross layer mapping unit 101 divides the information bits mapped to the layer 0 and the layer 1 and maps them to the layer 2 and the layer 3. Specifically, the cross layer mapping unit 101 combines the first half of the information bits mapped to layer 0 and the second half of the information bits mapped to layer 1 to map to layer 2 for example. Further, the cross layer mapping unit 101 combines the second half of the information bits mapped to layer 0 and the first half of the information bits mapped to layer 1 to map to layer 3 for example.
- the cross layer mapping unit 101 maps the same information bit to a plurality of layers in an overlapping manner. Therefore, in the example described above, the first half of layer 0 and a part of layer 2 overlap, and the second half of layer 0 and a part of layer 3 overlap. Also, the first half of layer 1 and a part of layer 3 overlap, and the second half of layer 1 and a part of layer 2 overlap.
- CRC adding sections 102-0 to 102-3 add CRC for error detection to the information bits of each layer, and turbo encoding sections 103-0 to 103-3 corresponding to the information bits for each layer including the CRC, respectively. Output to.
- Turbo encoding sections 103-0 to 103-3 turbo code the information bits of layers 0 to 3, respectively, and generate encoded data in which redundant bits are added to the information bits of layers 0 to 3.
- the coding rates in the turbo coding units 103-0 to 103-3 may be the same as or different from each other. In the following description, it is assumed that the coding rates in the turbo coding units 103-0 to 103-3 are mainly the same.
- Modulation sections 104-0 to 104-3 modulate the encoded data of layers 0 to 3, respectively, and output the obtained modulated data to MIMO precoding section 105.
- the modulators 104-0 to 104-3 modulate the encoded data by a modulation scheme such as QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), or 64QAM.
- MIMO precoding section 105 receives CSI (Channel State Information) transmitted from a receiving apparatus, which will be described later, via antennas 106-0 to 106-3, and receives packets including modulation data of each layer as received CSI. Precoding based on. That is, MIMO precoding section 105 sets a code book from channel characteristic information included in CSI, and applies the reverse characteristics of the channel characteristics to the packets of layers 0 to 3 using the set code book. Then, MIMO precoding section 105 transmits the precoded packets of layers 0 to 3 from corresponding antennas 106-0 to 106-3, respectively.
- CSI Channel State Information
- FIG. 2 is a block diagram showing a configuration of the receiving apparatus according to the present embodiment.
- the receiving apparatus shown in the figure includes antennas 201-0 to 201-3, MIMO processing section 202, maximum ratio combining sections 203-0 to 203-3, turbo decoding sections 204-0 to 204-3, soft decision value combining.
- Unit 205 hard decision unit 206, error detection unit 207, decoding control unit 208, and LLR (Log-Likelihood Ratio) setting unit 209.
- the MIMO processing unit 202 receives the data transmitted from the transmission device via the antennas 201-0 to 201-3, and executes predetermined matrix operations and the like, thereby performing the antennas 106-0 to 106-3 of the transmission device.
- the packets of layers 0 to 3 that are respectively transmitted from are separated.
- MIMO processing section 202 estimates channel characteristics from the received data, and feeds back CSI including the estimation result to transmitting apparatuses via antennas 201-0 to 201-3.
- the maximum ratio combining sections 203-0 to 203-3 combine the overlapping portions of the packets of layers 0 to 3 with the maximum ratio combining.
- the maximum ratio combining unit 203-0 performs, for example, maximum ratio combining of overlapping portions of layer 0 packets and layer 2 and layer 3 packets.
- the maximum ratio combining unit 203-1 combines the overlapping portions of the layer 1 packet and the layer 2 and layer 3 packets, and the maximum ratio combining units 203-2 and 203-3 respectively The overlapping parts of the second and third packets and the layer 0 and layer 1 packets are combined at the maximum ratio.
- the MIMO processing unit 202 and the maximum ratio combining units 203-0 to 203- are input so that the packets of all layers 0 to 3 are input to the maximum ratio combining units 203-0 to 203-3. 3 are connected, but it is not always necessary to input the packets of all layers 0 to 3 to the maximum ratio combining sections 203-0 to 203-3. That is, the maximum ratio combining sections 203-0 to 203-3 may be configured to receive the packets of layers 0 to 3 and the packets having overlapping portions in the layers 0 to 3, respectively.
- Turbo decoding sections 204-0 to 204-3 turbo-decode the packets of layers 0 to 3 in which overlapping portions are combined at the maximum ratio. Specifically, turbo decoding sections 204-0 to 204-3 use the redundant bits added to the packets of layers 0 to 3, and perform turbo decoding of the packets using LLR. Further, turbo decoding sections 204-0 to 204-3 perform iterative decoding of packets of layers 0 to 3 according to the control of decoding control section 208.
- the turbo decoding units 204-0 to 204-3 replace a part of the packet designated by the LLR setting unit 209 with the hard decision value fed back by the LLR setting unit 209, and are replaced.
- the packet is turbo-decoded with the LLR of the selected portion set to infinity.
- the portion where the LLR is infinite means that the likelihood is high, and the turbo decoding units 204-0 to 204-3 perform error correction decoding with higher accuracy than the previous time.
- at least turbo decoding units 204-0 to 204-3 corresponding to the layer where the replacement with the hard decision value has occurred may perform turbo decoding.
- Soft decision value combining section 205 combines soft decision values of information bits of layers 0 to 3 obtained as a result of turbo decoding of packets of layers 0 to 3 by turbo decoding sections 204-0 to 204-3. To do. Specifically, the soft decision value synthesis unit 205 synthesizes, for example, the soft decision value of the information bits of layer 0 and the soft decision values of the portions corresponding to layer 2 and layer 3, respectively. Similarly, the soft decision value combining unit 205 combines the soft decision values of the information bits of layer 1 and the soft decision values of the corresponding portions of layer 2 and layer 3, respectively. That is, soft decision value combining section 205 combines soft decision values of overlapping information bits of layers 0 to 3.
- the hard decision unit 206 makes a hard decision on the soft decision value after synthesis by the soft decision value synthesis unit 205 and determines whether the information bits of each layer 0 to 3 are “0” or “1”, respectively. That is, hard decision section 206 obtains a hard decision value corresponding to each information bit of layers 0 to 3 in the transmission apparatus.
- the error detection unit 207 detects errors in the hard decision values of the layers 0 to 3 using the CRC included in the information bits of the layers 0 to 3. That is, error detection section 207 uses the portion corresponding to CRC of the hard decision values of layers 0 to 3 obtained in hard decision section 206, so that the hard decision values of layers 0 to 3 are layer 0 to layer 0 in the transmitting apparatus. It is determined whether it is equal to 3 information bits. If the error detection unit 207 determines that there is no error in the hard decision values of the layers 0 to 3, the error detection unit 207 acquires and outputs information bits in the transmission apparatus from the hard decision values. That is, error detection section 207 removes the portion where the hard decision values overlap, and outputs, for example, the hard decision values of layer 0 and layer 1 as information bits in the transmission apparatus.
- the decoding control unit 208 controls the presence / absence of iterative decoding by the turbo decoding units 204-0 to 204-3 according to the error detection result in the error detection unit 207. Specifically, the decoding control unit 208 stops iterative decoding when there is no error in all layers 0 to 3 or when there is an error in all layers 0 to 3. In addition, when there are both a layer with an error and a layer without an error, the decoding control unit 208 executes iterative decoding. However, the decoding control unit 208 stops the iterative decoding when the number of layers without error is not increased compared to the previous decoding.
- the LLR setting unit 209 feeds back a hard decision value of an error-free layer to the turbo decoding units 204-0 to 204-3 as a result of error detection in the error detection unit 207, and turbo decoding using this hard decision value
- the LLR corresponding to the hard decision value is set to infinity. That is, the LLR setting unit 209 feeds back the hard decision value of the layer in which the error is newly eliminated by the current decoding to the turbo decoding units 204-0 to 204-3, and the packet portion corresponding to this hard decision value is returned. Replace with hard decision value.
- the LLR setting unit 209 sets the LLR of the replaced portion to infinity, and causes the turbo decoding units 204-0 to 204-3 to execute turbo decoding again. By replacing a part of the packet with a hard decision value and setting the LLR to infinity, the accuracy of turbo decoding by the turbo decoding units 204-0 to 204-3 is improved as compared with the previous decoding.
- FIG. 3 is a diagram illustrating how information bits are mapped to layers 0 to 3 in the transmission apparatus.
- the cross layer mapping unit 101 sets four information bits I 0 and I 1 . Mapping is performed across layers 0 to 3. Specifically, the information bit I 0 is divided into information bits I 0,0 and I 0,1 and the information bit I 1 is divided into information bits I 1,0 and I 1,1 by the cross layer mapping unit 101. Is done. Then, the cross layer mapping unit 101 maps information bits I 0,0 redundantly to layer 0 and layer 2, and information bits I 0,1 overlaps layer 0 and layer 3 to Bits I 1,0 are mapped to Layer 1 and Layer 3 redundantly, and information bits I 1,1 are mapped to Layer 1 and Layer 2 redundantly.
- the original information bits I 0 and I 1 are continuously mapped to the layer 0 and the layer 1 in the same order, while the information mapped to the layers 0 and 1 is mapped to the layers 2 and 3. Some of the bits are mapped in duplicate. Therefore, when comparing layer 0 with layer 2 or layer 3, some information bits I 0,0 and I 0,1 overlap, and some information bits I 1,1 and I 1,0 differ. ing. Similarly, when comparing layer 1 with layer 2 or layer 3, some information bits I 1,1 and I 1,0 overlap, and some information bits I 0,0 and I 0,1 differ. is doing.
- the mapping by the cross layer mapping unit 101 generates Layer 2 and Layer 3 that partially overlap with each of Layer 0 and Layer 1 and partially differ from each other with Layer 0 and Layer 1 as a reference. Is done.
- all the information bits I 0,0 , I 0,1 , I 1,0 , I 1,1 of layer 0 and layer 1 all overlap, but not all information bits I 0,0 , I 0,1 , I 1,0 , I 1,1 do not have to overlap.
- some information bits overlap in any combination of a reference layer (here, layer 0 and layer 1) and other layers (here, layer 2 and layer 3), and some information bits Should be different.
- the information bits mapped to the layers 0 to 3 by the cross layer mapping unit 101 are output to the CRC adding units 102-0 to 102-3, respectively, and the CRC adding units 102-0 to 102-3 perform the layers 0 to 3 respectively. CRC corresponding to the information bits is added. Then, the information bits of layers 0 to 3 including the CRC are output to the corresponding turbo encoding units 103-0 to 103-3 and turbo encoded. Specifically, the turbo coding unit 103-0 adds the redundant bits P 0,0,0,1 to the information bits I 0,0 and the information bits I 0,1 of layer 0, and the turbo coding unit 103-0. ⁇ 1 adds redundant bits P 1,0,1,1 to layer 1 information bits I 1,0 and information bits I 1,1 .
- redundant bits P 0,0,1,1 are added to the layer 2 information bits I 0,0 and the information bits I 1,1 by the turbo coding unit 103-2, and the turbo coding unit 103-3
- redundant bits P 0,1,1,0 are added to information bits I 0,1 and information bits I 1,0 of layer 3.
- Each combination of information bits and redundant bits obtained by turbo coding in turbo coding sections 103-0 to 103-3 is one packet. That is, the combination of the information bit I 0,0 and the information bit I 0,1 and the redundant bit P 0,0,0,1 is a layer 0 packet, and the information bit I 1,0 and the information bit I 1,1 , The combination with redundant bits P 1,0,1,1 is a layer 1 packet. The combination of the information bits I 0,0 and I 1,1 and the redundant bits P 0,0,1,1 is a layer 2 packet, and the information bits I 0,1 and information bits I 1,0 The combination with the redundant bits P 0,1,1,0 is a layer 3 packet.
- the packets of layers 0 to 3 are modulated by the modulation units 104-0 to 104-3, precoded according to the channel characteristics by the MIMO precoding unit 105, and respectively received from the corresponding antennas 106-0 to 106-3. Sent. That is, the original packet of layer 0 is transmitted by the antenna 106-0, the original packet of layer 1 is transmitted by the antenna 106-1, the auxiliary packet of layer 2 is transmitted by the antenna 106-2, and the antenna 106- 3, a layer 3 auxiliary packet is transmitted. These packets are combined after being propagated through different channels and received by the respective antennas 201-0 to 201-3 of the receiving apparatus.
- the received data at the antennas 201-0 to 201-3 is subjected to a receiving process such as a predetermined matrix calculation by the MIMO processing unit 202 (step S101), and is separated into packets of layers 0 to 3 in the transmitting apparatus. .
- These packets of layers 0 to 3 are input to maximum ratio combining sections 203-0 to 203-3.
- the maximum ratio combining units 203-0 to 203-3 receive the packets of the layers having portions overlapping with these layers 0 to 3. .
- the maximum ratio combining sections 203-0 to 203-3 combine the overlapping portions of each packet (step S102). That is, as shown in FIG. 6, in the maximum ratio combining unit 203-0, the layer 0 and layer 2 information bits I 0,0 are subjected to maximum ratio combining, and the layer 0 and layer 3 information bits I 0,1 are combined. Maximum ratio synthesis. In the maximum ratio combining unit 203-1, the information bits I 1,1 of layer 1 and layer 2 are combined at the maximum ratio, and the information bits I 1,0 of layer 1 and layer 3 are combined at the maximum ratio.
- the maximum ratio combining unit 203-2 the information bits I 0,0 of layer 2 and layer 0 are combined at the maximum ratio, and the information bits I 1,1 of layer 2 and layer 1 are combined at the maximum ratio.
- the maximum ratio combining unit 203-3 the information bits I 0,1 of layer 3 and layer 0 are combined at the maximum ratio, and the information bits I 1,0 of layer 3 and layer 1 are combined at the maximum ratio.
- the maximum ratio combining sections 203-0 to 203-3 combine the overlapping portions of the packets of different layers, so that the packets propagated through different channels are combined. Gain is obtained. As a result, it is possible to compensate for deterioration in reception quality.
- turbo decoding is performed (step S103). That is, decoding is performed using redundant bits included in each packet and a preset LLR, and soft decision values of information bits of packets of each layer are obtained. Specifically, by using the redundant bits P 0,0,0,1 by the turbo decoding unit 204-0, the soft decision values of the information bits I 0,0 and I 0,1 are obtained. By using redundant bits P 1,0,1,1 by decoding section 204-1, soft decision values of information bits I 1,0 and I 1,1 are obtained.
- turbo decoding unit 204-2 soft decision values of information bits I 0,0 and I 1,1 are obtained, and turbo decoding is performed.
- turbo decoding is performed.
- soft decision values of the information bits I 0,1 , I 1,0 are obtained.
- the soft decision values obtained by turbo decoding are synthesized by the soft decision value synthesis unit 205 (step S104). That is, in turbo decoding sections 204-0 to 204-3, since turbo decoding of overlapping information bits is performed, soft decision values of overlapping information bits are combined by soft decision value combining section 205. . Specifically, as shown in FIG. 7, the soft decision values of information bits I 0,0 of layer 0 and layer 2 are combined, and the soft decision values of information bits I 0,1 of layer 0 and layer 3 are combined. Then, the soft decision values of information bits I 1,0 of layer 1 and layer 3 are combined, and the soft decision values of information bits I 1,1 of layer 1 and layer 2 are combined. In this way, by combining soft decision values of different layers for the same information bit, a gain by cross-layer mapping of the transmission device can be obtained. As a result, it is possible to compensate for deterioration in reception quality.
- the result of combining the soft decision values of the information bits of the respective layers 0 to 3 is output to the hard decision unit 206, and a hard decision is performed (step S105). That is, the information bits of layers 0 to 3 including the information bits I 0,0 , I 0,1 , I 1,0 , I 1,1 correspond to either “0” or “1” hard decision values, respectively. It is decided whether to do. In the present embodiment, since the hard decision is performed after the soft decision value synthesis in the soft decision value synthesis unit 205, the accuracy of the hard decision value obtained in the hard decision unit 206 is high.
- Step S106 The error detection result for each layer is notified to the decoding control unit 208, and the decoding control unit 208 determines that there are no errors in the hard decision values of all layers 0 to 3, or the hard decision values of all layers 0 to 3 are set. It is determined whether there is an error (step S107).
- step S107 If there is no error in the hard decision values of all layers 0 to 3 as a result of this determination (Yes in step S107), it is not necessary to perform iterative decoding by the turbo decoding units 204-0 to 204-3. 208 instructs the turbo decoding sections 204-0 to 204-3 to stop the iterative decoding. In this case, since the hard decision value obtained from the original packet is considered to be equal to the information bits in the transmission device, the error detection unit 207 outputs, for example, the hard decision values of layer 0 and layer 1 as information bits. Is done.
- step S107 Yes if there is an error in the hard decision values of all layers 0 to 3 (step S107 Yes), the error rate can be improved even if iterative decoding is performed by the turbo decoding units 204-0 to 204-3. Therefore, the decoding control unit 208 instructs the turbo decoding units 204-0 to 204-3 to stop iterative decoding. In this case, the transmission apparatus may be requested to retransmit the packet.
- the decoding control unit 208 subsequently determines that the layer having no error in the hard decision value is the previous time. It is determined whether or not it has increased compared to the time of decoding (step S108).
- the decoding control unit 208 executes the iterative decoding in the turbo decoding unit 204. Instructed to -0 to 204-3.
- the LLR setting unit 109 feeds back the hard decision value having no error to the turbo decoding units 204-0 to 204-3, and corresponds to the hard decision value having no error among the information bits of the layers 0 to 3.
- the part is replaced with a hard decision value. That is, as a result of error detection in the error detection unit 207, for example, when it is determined that there is no error in the hard decision value of layer 0, the hard decision value of layer 0 corresponds to the information bits I 0,0 and I 0,1 . Therefore, the LLR setting unit 209 feeds back hard decision values corresponding to the information bits I 0,0 and I 0,1 .
- the LLR setting unit 209 sets the LLR of the portion replaced with the hard decision value to infinity (step S109). That is, after the initial decoding, in turbo decoding sections 204-0 to 204-3, a part of each packet is replaced with an error-free hard decision value, and the LLR of the corresponding part is set to the maximum.
- turbo decoding units 204-0 to 204-3 perform turbo decoding again (step S103).
- the turbo decoding units 204-0 to 204-3 corresponding to the layer in which a part of the packet is replaced with the hard decision value may perform turbo decoding.
- a part of the packet is replaced with an error-free hard decision value, and the LLR of the corresponding part is infinite.
- turbo decoding is performed by the turbo decoding units 204-0 to 204-3 on the assumption that there is no error in the hard decision value portion in the packet, and soft decoding with higher accuracy than in the first decoding is performed. A judgment value is obtained.
- step S104 the soft decision values of each of layers 0 to 3 are combined by the soft decision value combining unit 205 (step S104), and the combined soft decision values are hard determined (step S104).
- step S105 the error detection unit 207 performs error detection using CRC (step S106).
- step S107 if there is no error in the hard decision values of all layers 0 to 3 (step S107 Yes), the decoding control unit 208 instructs the turbo decoding units 204-0 to 204-3 to stop iterative decoding.
- the decoding control unit 208 instructs the turbo decoding units 204-0 to 204-3 to stop the iterative decoding.
- the hard decision values of all layers 0 to 3 have no error, or the hard decision value is set. The above-described iterative decoding is performed until the number of layers without errors does not increase.
- the decoding control unit 208 executes iterative decoding in the turbo decoding units 204-0 to 204-. 3 is instructed.
- the LLR setting unit 209 replaces the information bits I 0,1 of layer 0 and the information bits I 1,0 of layer 1 with the hard decision values of layer 3, respectively. The LLR of these information bits is set to infinity.
- the LLRs of the portions shown in black in the drawing of the layer 0 and layer 1 packets are set to infinity, and the turbo decoding units 204-0 ⁇ Turbo decoding according to 204-3 is performed.
- the precision of the soft decision values of layer 0 and layer 1 is 1. It becomes higher than the time of the first decoding. As a result, it is assumed that no error is detected from the hard decision value of layer 0 by the second decoding.
- the decoding control unit 208 instructs the turbo decoding units 204-0 to 204-3 to execute iterative decoding.
- the LLR setting unit 209 replaces the layer 2 information bit I 0,0 with the layer 0 hard decision value, and the information bit I 0,0 LLR is set to infinity.
- the LLR of the portion indicated by black in the drawing in the layer 2 packet is set to infinity, and the turbo decoding units 204-0 to 204-3 Turbo decoding is performed.
- the accuracy of the soft decision value of layer 2 is higher than in the first and second decoding.
- the decoding control unit 208 instructs the turbo decoding units 204-0 to 204-3 to execute iterative decoding. Also, since there are no more error in the new hard decision value of the layer 2, the LLR setting unit 209, the information bits I 1, 1 layer 1 is replaced by the hard decision value of the layer 2, the information bits I 1, 1 LLR is set to infinity.
- the LLR of the portion shown in black in the drawing in the layer 1 packet is set to infinity, and the turbo decoding units 204-0 to 204-3 Turbo decoding is performed.
- the accuracy of the soft decision value in layer 1 is higher than that in the first to third decoding. Become.
- the decoding control unit 208 instructs the turbo decoding units 204-0 to 204-3 to stop the iterative decoding. Also, the hard decision values of layer 0 and layer 1 are output from the error detection unit 207 as information bits in the transmission apparatus. By executing such iterative decoding, the error rate of received data can be reduced. In other words, even if the reception quality is somewhat degraded, a certain standard error rate can be satisfied, and the frequency of retransmissions is reduced. As a result, the throughput in MIMO communication can be improved reliably.
- FIG. 9 is a diagram showing a specific example of the relationship between the reception quality and the error rate in each of the case where iterative decoding according to the present embodiment is executed and the case where conventional decoding is executed.
- the upper part of FIG. 9 shows the relationship between SNR (Signal to Noise Ratio) and BLER (BLock Error Rate) when the modulation method in the transmission apparatus is QPSK, and the lower part of FIG. 9 shows the case where the modulation method in the transmission apparatus is 64QAM.
- the relationship between SNR and BLER is shown.
- the graph indicated by white marks in the figure corresponds to iterative decoding according to the present embodiment
- the graph indicated by black marks in the figure corresponds to conventional decoding.
- the graph indicated by a circle mark corresponds to a case where the coding rate in the transmission device is 1/3
- the graph indicated by a square mark is a case where the coding rate in the transmission device is 1/2
- a graph indicated by a triangle mark corresponds to a case where the coding rate in the transmission apparatus is 3/4.
- the SNR required to satisfy the same level of BLER is lower when the iterative decoding according to the present embodiment is performed in any modulation scheme and coding rate. ing.
- QPSK is adopted as the modulation scheme, even if the SNR is deteriorated by about 2.2 to 3.0 dB compared to the conventional case, the degradation of the reception quality is compensated by the iterative decoding according to the present embodiment. be able to.
- a transmission apparatus maps information bits to a plurality of layers
- a part of the information bits mapped to one layer is overlapped and mapped to another layer.
- Cross-layer mapping is performed, and packets of each layer are transmitted from a plurality of antennas.
- the receiving apparatus performs decoding for each layer while synthesizing overlapping portions of the layers, feeds back the decoding result of the layer in which no error is detected, and repeatedly performs decoding. For this reason, each layer can be compensated for by overlapping portions of a plurality of layers, the error rate of received data can be reduced, and the throughput can be reliably improved.
- the maximum ratio combining units 203-0 to 203-3 of the receiving apparatus combine the packets of layers 0 to 3, but the combination of these packets is the maximum ratio combining. It is not limited to. That is, as long as the diversity gain is obtained by combining the energy of the packets of layers 0 to 3, the method of combining the packets of layers 0 to 3 may be arbitrary.
- the transmission device and the reception device have been described by taking 4 ⁇ 4 MIMO communication including four antennas as an example.
- the number of antennas of the transmission device and the reception device is four. It is not limited. That is, in general, when each of the transmission device and the reception device includes m antennas (m is an integer of 2 or more), packets of n layers (n ⁇ m) out of m layers are originally generated. By using packets and (mn) layer packets as auxiliary packets, the same effect as in the above embodiment can be obtained.
- n layers of packets from layer 0 to layer (n ⁇ 1) are original packets
- (mn) packets from layer n to layer (m ⁇ 1) The packet of the layer becomes an auxiliary packet.
- n original packets of layers 0 to (n ⁇ 1) redundant bits P 0 to P n ⁇ 1 are added to information bits, respectively.
- auxiliary packets of layers n to (m ⁇ 1) information bits are configured by combining equal pieces of information bits of n original packets. Redundant bits P n to P m ⁇ 1 are added to the entire bits.
- various types of hatching indicate the information bits of the original packet of each layer.
- the information bits of the original packet overlap with some of the information bits of the auxiliary packet, but all the information bits of the original packet need not necessarily overlap with some of the information bits of the auxiliary packet.
- the auxiliary packet There is no. That is, for example, as shown in FIG. 11, when information bits are mapped to only two layers 0 and 1, for example, half of the information bits mapped to layer 0 may be duplicated and mapped to layer 1. It ’s fine. Even in such a case, if the layer 0 packet is the original packet and the layer 1 packet is the auxiliary packet, some of the information bits are duplicated between these packets, and some of the information bits are different. is doing.
- the turbo coding sections 103-0 to 103-3 of the transmission device have been described as performing turbo coding at the same coding rate. May be different. Specifically, as shown in FIG. 12, even if the coding rate of the packet of each layer is different, in the combination of the original packet and the auxiliary packet, some of the information bits overlap, and some of the information bits It is different.
- the cross layer mapping unit 101 of the transmission apparatus performs mapping in consideration of the coding rate in each layer. That is, the cross layer mapping unit 101 distributes and maps the information bits of the original packets of layers 0 to (n ⁇ 1) according to the coding rate of each auxiliary packet of layers n to (m ⁇ 1). Then, the turbo coding unit performs coding at a coding rate corresponding to the size of the information bit included in each of the original packet and the auxiliary packet.
Abstract
Description
102-0~102-3 CRC付加部
103-0~103-3 ターボ符号化部
104-0~104-3 変調部
105 MIMOプリコーディング部
106-0~106-3、201-0~201-3 アンテナ
202 MIMO処理部
203-1~203-3 最大比合成部
204-1~204-3 ターボ復号化部
205 軟判定値合成部
206 硬判定部
207 誤り検出部
208 復号制御部
209 LLR設定部
図1は、本実施の形態に係る送信装置の構成を示すブロック図である。同図に示す送信装置は、クロスレイヤマッピング部101、誤り検出符号化の1例としてのCRC(Cyclic Redundancy Check)付加部102-0~102-3、誤り訂正符号化の1例としてのターボ符号化部103-0~103-3、変調部104-0~104-3、MIMOプリコーディング部105及びアンテナ106-0~106-3を有している。図1において、CRC付加部102-0、ターボ符号化部103-0、変調部104-0及びアンテナ106-0に対応するレイヤを「レイヤ0」という。同様に、CRC付加部102-1~102-3、ターボ符号化部103-1~103-3、変調部104-1~104-3及びアンテナ106-1~106-3に対応するレイヤをそれぞれ「レイヤ1」、「レイヤ2」及び「レイヤ3」という。
図2は、本実施の形態に係る受信装置の構成を示すブロック図である。同図に示す受信装置は、アンテナ201-0~201-3、MIMO処理部202、最大比合成部203-0~203-3、ターボ復号化部204-0~204-3、軟判定値合成部205、硬判定部206、誤り検出部207、復号制御部208及びLLR(Log-Likelihood Ratio:対数尤度比)設定部209を有している。
次いで、図1に示した送信装置の動作について、具体的に例を挙げながら説明する。図3は、送信装置において情報ビットがレイヤ0~3にマッピングされる様子を示す図である。
次いで、図2に示した受信装置の動作について、図5に示すフロー図を参照しながら、具体的に例を挙げて説明する。
次に、本実施の形態に係る繰り返し復号の具体例について、図8を参照しながら説明する。以下においては、2回目以降の復号時にもすべてのターボ復号化部204-0~204-3がターボ復号化を実行するものとする。
Claims (14)
- 複数のアンテナに対応する複数のレイヤのうち第1のレイヤに情報データをマッピングするとともに、第2のレイヤに前記第1のレイヤにマッピングされた情報データと一部が重複し一部が相違する情報データをマッピングするマッピング部と、
前記マッピング部によって前記第1のレイヤ及び前記第2のレイヤにマッピングされた情報データにレイヤごとの誤り検出符号化及び誤り訂正符号化を施して送信データを生成する符号化部と、
前記符号化部によって生成されたレイヤごとの送信データをそれぞれのレイヤに対応するアンテナから送信する送信部と
を有することを特徴とするマルチアンテナ通信装置。 - 前記符号化部は、
前記第1のレイヤ及び前記第2のレイヤにマッピングされた情報データにそれぞれCRC符号を付加することを特徴とする請求項1記載のマルチアンテナ通信装置。 - 前記マッピング部は、
前記第1のレイヤにマッピングされた情報データを分割して複数の部分情報データを生成し、前記第2のレイヤの情報データの一部としていずれかの部分情報データをマッピングすることを特徴とする請求項1記載のマルチアンテナ通信装置。 - 前記マッピング部は、
前記第1のレイヤにマッピングされた情報データを等分して前記部分情報データを生成することを特徴とする請求項3記載のマルチアンテナ通信装置。 - 前記マッピング部は、
前記第2のレイヤにマッピングされた部分情報データ以外の部分情報データを第1及び第2のレイヤとは異なるレイヤにマッピングし、
前記符号化部は、
部分情報データがマッピングされたすべてのレイヤの情報データを同一の符号化率で誤り訂正符号化することを特徴とする請求項4記載のマルチアンテナ通信装置。 - 前記マッピング部は、
前記第2のレイヤにマッピングされた部分情報データ以外の部分情報データを第1及び第2のレイヤとは異なるレイヤにマッピングし、
前記符号化部は、
部分情報データがマッピングされたレイヤの情報データをそれぞれの部分情報データのサイズに応じた符号化率で誤り訂正符号化することを特徴とする請求項3記載のマルチアンテナ通信装置。 - マッピングされた情報データの一部が重複し一部が相違する複数のレイヤのデータを受信し、受信データをレイヤごとのレイヤ別データに分離する受信処理部と、
前記受信処理部によって分離されて得られたレイヤ別データを誤り訂正復号化してレイヤごとの軟判定値を生成する復号化部と、
前記復号化部によって生成されたレイヤごとの軟判定値のうち複数のレイヤに重複してマッピングされた情報データに対応する軟判定値を合成する合成部と、
前記合成部によって合成されて得られた軟判定値を用いてレイヤ別データを硬判定する判定部と
を有することを特徴とするマルチアンテナ通信装置。 - 前記受信処理部によって分離されて得られた各レイヤ別データに、自レイヤの情報データと重複してマッピングされた情報データに対応する他レイヤのレイヤ別データの一部分を合成するデータ合成部をさらに有し、
前記復号化部は、
前記データ合成部による合成後のレイヤ別データを誤り訂正復号化することを特徴とする請求項7記載のマルチアンテナ通信装置。 - 前記判定部によるレイヤ別データの硬判定結果から誤りを検出する検出部と、
前記検出部による誤り検出の結果、誤りが検出されないレイヤ別データの硬判定結果を前記復号化部へフィードバックするフィードバック部とをさらに有し、
前記復号化部は、
レイヤ別データの前記フィードバック部によってフィードバックされた硬判定結果に対応する部分を当該硬判定結果に置き換えて誤り訂正復号化することを特徴とする請求項7記載のマルチアンテナ通信装置。 - 前記復号化部は、
前記硬判定結果に置き換えられた部分の対数尤度比を無限大に設定した上で、置き換え後のレイヤ別データをターボ復号化することを特徴とする請求項9記載のマルチアンテナ通信装置。 - 前記検出部による誤り検出の結果、すべてのレイヤ別データから誤りが検出されない場合に、前記復号化部による誤り訂正復号化を停止させる制御部をさらに有することを特徴とする請求項9記載のマルチアンテナ通信装置。
- 前記制御部は、
前記検出部による誤り検出の結果、誤りが検出されないレイヤ別データの数が前回の誤り検出時から増加していない場合に、前記復号化部による誤り訂正復号化を停止させることを特徴とする請求項9記載のマルチアンテナ通信装置。 - 複数のアンテナに対応する複数のレイヤのうち第1のレイヤに情報データをマッピングするとともに、第2のレイヤに前記第1のレイヤにマッピングされた情報データと一部が重複し一部が相違する情報データをマッピングするマッピングステップと、
前記マッピングステップにて前記第1のレイヤ及び前記第2のレイヤにマッピングされた情報データにレイヤごとの誤り検出符号化及び誤り訂正符号化を施して送信データを生成する符号化ステップと、
前記符号化ステップにて生成されたレイヤごとの送信データをそれぞれのレイヤに対応するアンテナから送信する送信ステップと
を有することを特徴とするマルチアンテナ通信方法。 - マッピングされた情報データの一部が重複し一部が相違する複数のレイヤのデータを受信し、受信データをレイヤごとのレイヤ別データに分離する受信処理ステップと、
前記受信処理ステップにて分離されて得られたレイヤ別データを誤り訂正復号化してレイヤごとの軟判定値を生成する復号化ステップと、
前記復号化ステップにて生成されたレイヤごとの軟判定値のうち複数のレイヤに重複してマッピングされた情報データに対応する軟判定値を合成する合成ステップと、
前記合成ステップにて合成されて得られた軟判定値を用いてレイヤ別データを硬判定する判定ステップと
を有することを特徴とするマルチアンテナ通信方法。
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- 2009-03-26 WO PCT/JP2009/056138 patent/WO2010109635A1/ja active Application Filing
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Also Published As
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EP2424142A1 (en) | 2012-02-29 |
JPWO2010109635A1 (ja) | 2012-09-20 |
KR20110121650A (ko) | 2011-11-07 |
KR101287753B1 (ko) | 2013-07-19 |
JP5370476B2 (ja) | 2013-12-18 |
CN102365835A (zh) | 2012-02-29 |
CN102365835B (zh) | 2015-04-15 |
EP2424142A4 (en) | 2014-10-01 |
US20120014475A1 (en) | 2012-01-19 |
US8462870B2 (en) | 2013-06-11 |
EP2424142B1 (en) | 2017-03-01 |
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