WO2004086634A1 - 符号化装置および符号化方法 - Google Patents
符号化装置および符号化方法 Download PDFInfo
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- WO2004086634A1 WO2004086634A1 PCT/JP2004/003907 JP2004003907W WO2004086634A1 WO 2004086634 A1 WO2004086634 A1 WO 2004086634A1 JP 2004003907 W JP2004003907 W JP 2004003907W WO 2004086634 A1 WO2004086634 A1 WO 2004086634A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0064—Concatenated codes
- H04L1/0066—Parallel concatenated codes
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
- H03M13/258—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] with turbo codes, e.g. Turbo Trellis Coded Modulation [TTCM]
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
- H03M13/2957—Turbo codes and decoding
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/35—Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0067—Rate matching
- H04L1/0068—Rate matching by puncturing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
Definitions
- the present invention relates to an encoding device and an encoding method, and more particularly, to an encoding device and an encoding method for space-time turbo encoding transmission data.
- turbo coding In recent years, in error correction codes for wireless communication, turpo codes approaching Shannon's limit, which is the theoretical limit of the transmission rate that can be transmitted without errors, have been receiving attention.
- turbo coding generally, a sequence of systematic bits themselves, which are information bits, a sequence of parity bits, which are redundant bits obtained by convolutionally coding systematic bits, and a sequence of systematic bits, A parity bit sequence obtained by performing convolutional coding after performing the interleaving, and a plurality of bit sequences such as are output.
- Space-time turbo coding is a type of SDM (Space Division Multiplexing) that spatially multiplexes multiple signals on the transmission side.
- a plurality of bit sequences generated by tapo coding are modulated, symbol mapped, and transmitted from a plurality of transmission antennas assigned to each bit sequence.
- IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 49, NO. 1 JANUARY 2001 "Space-Time Turbo Codes with Full Antenna Diversity” and IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 19, NO. 5, MAY 2001 " Turbo-Coded Modulation for See Systems with Transmit and Receive Antenna Diversity over Block Fading Channels: System Model, Decoding Approaches, and Practical Considerations.
- FIGS. 1A to 1C are diagrams showing signal point arrangements when transmitting a plurality of bit sequences obtained by turbo coding from two transmission antennas, as an example of space-time turbo coding.
- FIG. 1A is a diagram illustrating an example of a signal point arrangement when BPSK (Binary Phase Shift Keying) modulation is performed on each bit sequence transmitted from two transmission antennas.
- BPSK Binary Phase Shift Keying
- FIG. 1B is a diagram showing an example of a signal point arrangement when QPSK (Quadrature Phase Shift Keying) modulation is performed on each bit sequence transmitted from two transmission antennas.
- QPSK Quadrature Phase Shift Keying
- the points other than the four points indicated by the black dots in the figure are points where two or four points overlap, and degeneration has occurred.
- degeneration has occurred at 75% of the points, and BPS The probability of occurrence of degeneration is higher than in the case of K modulation.
- FIG. 1C is a diagram showing an example of a signal point arrangement when 16 QAM (16 Quadrature Amplitude Modulation; modulation is applied to each bit sequence transmitted from two transmission antennas. .
- the points other than the four points indicated by the black dots in the figure are points where two to four points overlap, and degeneration has occurred. That is, in the case of 16 Q AM modulation, degeneration has occurred at about 98% of the entire points, and the probability of occurrence of degeneration is higher than in the case of Q PSK modulation.
- An object of the present invention is to provide an encoding device and an encoding method that can prevent deterioration of demodulation performance without increasing interference power.
- the subject of the present invention is to modulate each bit sequence with a different modulation scheme when transmitting the encoded systematic bits and parity bits from a plurality of transmitting antennas.
- an encoding device encodes transmission data and outputs systematic bits and parity bits, and outputs the output systematic bits and parity bits using different modulation schemes.
- Modulating means for modulating the systematic bits and parity bits Transmitting means for transmitting the data from a plurality of corresponding antennas.
- an encoding method includes the steps of encoding transmission data to output systematic bits and parity bits, and modulating the output systematic bits and parity bits by different modulation schemes. And transmitting the modulated systematic bits and parity bits from a plurality of corresponding antennas.
- FIG.1A is a diagram showing an example of a signal point arrangement when BPSK modulation is applied in space-time turbo coding
- FIG.1B is a diagram showing an example of signal point arrangement when QPSK modulation is applied in space-time turbo coding
- FIG.1C is a diagram showing an example of a signal point arrangement in the case of applying 16 Q AM modulation in space-time turbo coding
- FIG. 2 is a block diagram showing a main configuration of a space-time turbo encoding device according to Embodiment 1 of the present invention
- FIG. 3A is a diagram showing an example of a signal point arrangement according to Embodiment 1,
- FIG. 3B is a diagram showing an example of a signal point arrangement according to the first embodiment
- FIG. 4 is a block diagram showing a main configuration of a space-time turbo encoding device according to Embodiment 2 of the present invention.
- FIG. 5A is a diagram showing an example of a bit arrangement according to the second embodiment
- FIG. 5B is a diagram showing an example of a bit arrangement according to the second embodiment.
- FIG. 6 is a diagram showing an example of a bit arrangement according to Embodiment 3 of the present invention.
- FIG. 7 is a block diagram showing a main configuration of a space-time turbo encoding device according to Embodiment 4 of the present invention.
- FIG. 8A is a diagram illustrating an example of a bit arrangement (first transmission signal) according to Embodiment 4, and FIG. 8B is an example of a bit arrangement according to Embodiment 4 (transmission at retransmission (second time)). Signal)
- FIG. 8C is a diagram showing an example of bit arrangement (transmission signal at the time of retransmission (third time)) according to Embodiment 4.
- FIG. 2 is a block diagram showing a main configuration of a space-time turbo encoding device according to Embodiment 1 of the present invention.
- the space-time turbo coding apparatus shown in FIG. 2 includes a turbo coding section 100, a selection section 200, a matching section 300-1 and 300-2, a radio transmission section 400-1 and 400-2, and a modulation scheme instruction section 500. It is mainly composed of Turbo encoding section 100 has interleaver 110, encoding sections 120-1, 120-2, puncture sections 130-1, 130-2, and deinterleaver 140. I have.
- Turbo encoding section 100 turbo-encodes transmission data and outputs systematic bits, which are information bits of the transmission data itself, and parity bits, which are redundant bits obtained by convolutionally encoding the systematic bits. I do.
- turbo encoding section 100 outputs transmission data itself to mapping section 300-1 as a sequence of systematic bits, and also outputs a sequence of two parity bits to selection section 200, as described below.
- the puncturing unit 130-1 performs puncturing on the coded bit 1 and the sequence obtained by performing convolutional coding by the coding unit 120-1, and thins out the bits.
- the output from puncturing section 130-1 is output to selecting section 200 as one parity bit sequence (hereinafter, referred to as “parity bit 1”).
- the interleaver 110 rearranges (interleaves) the bit order of the transmission data.
- Encoding section 120-0-2 convolutionally encodes the bit sequence after interleaving by interleaver 110.
- Puncturing section 13 0-2 performs puncturing on a coded bit sequence obtained by performing convolutional coding by coding section 120-2, and thins out bits.
- the interleaver 140 restores (interleaves) the order of the bits rearranged by the interleaver 110 with respect to the bit sequence output from the puncture unit 130-2.
- the output from the Dinter Lever 140 is output to the selector 200 as another parity bit sequence (hereinafter, referred to as “parity bit 2”).
- the bits are decimated from the coded bit sequence after convolutional coding, the bits are determined based on the modulation scheme notified from modulation scheme indicating section 500. This will be described later.
- the interleaver 140 restores the interleave by the interleaver 110, the two parity bits output simultaneously from the turbo encoder 100 correspond to the systematic bits output simultaneously. Will do.
- the selecting section 200 selects one of the two-series parity bits output from the turbo encoding section 100 and outputs the selected parity bit to the matching section 300-2.
- the mapping section 300-1 modulates the systematic bits output from the turbo coding section 100 and performs symbol matching.
- the matching section 300-1 modulates the systematic bits according to the modulation scheme specified by the modulation scheme indicating section 500.
- Radio transmitting section 400-1 performs predetermined radio transmission processing (D / A conversion, up-conversion, etc.) on the systematic bits, and transmits the resultant via antenna 450-1.
- the mapping section 300-2 is the parity bit output from the selection section 200. Is modulated to perform symbol mapping. At this time, mapping section 300-2 modulates the parity bits in the modulation scheme specified by modulation scheme specifying section 500.
- the modulation scheme specified by the mapping section 300-2 is different from the modulation scheme specified by the mapping section 300-1. In other words, the systematic bits and the parity bits are modulated by different modulation schemes.
- the radio transmission section 400-2 performs predetermined radio transmission processing (DZA conversion, up-conversion, etc.) on the parity bits, and transmits the parity bits via the antenna 450-2.
- predetermined radio transmission processing DZA conversion, up-conversion, etc.
- the modulation scheme instructing section 500 instructs the puncturing sections 130-1 and 130-2 and the mapping sections 300-1 and 300_2 of the modulation scheme. At this time, modulation scheme instructing section 500 instructs mapping section 300-1 to perform a modulation scheme for modulating the systematic bits, and modulates the parity bits with a modulation scheme different from this modulation scheme. Is instructed to the mapping section 300-2 as the modulation method of. Further, modulation scheme instructing section 500 notifies puncturing sections 133-1 and 130-2 of the modulation scheme for the systematic bits and parity bits.
- the transmission data is turbo-coded by the turbo coding unit 100. That is, systematic bits are output from the transmission data to the matching unit 300-1.
- the transmission data is convolutionally coded by the encoding unit 120-1, and is punctured by the puncturing unit 130-1, and the parity bit 1 is output to the selecting unit 200.
- the transmission data is interleaved by an interleaver 110, convolutionally encoded by an encoder 120-2, punctured by a puncturer 130-2, and deinterleaved by a deinterleaver 140.
- Bit 2 By the parity and the parity to the selector 200 Bit 2 is output.
- puncturing in puncturing sections 130-1 and 130-2 is performed based on the modulation scheme of the systematic bits and parity bits notified from modulation scheme indicating section 500. . That is, since the modulation schemes of systematic bits and parity bits are different from each other, the number of bits transmitted per symbol is different.However, the correspondence between systematic bits and parity bits may be disrupted. Bits are decimated from the coded bit sequence so that they do not exist.
- the puncture sections 13 0-1 and 13 0-2 lose the correspondence between systematic bits and ⁇ ⁇ ⁇ bits without increasing the number of bits to be culled from the coded bit sequence.
- one of parity bit 1 and parity bit 2 is selected by selection section 200, and output to mapping section 300-2.
- the selection of the parity bit by the selector 200 may be such that the parity bit 1 and the parity bit 2 are alternately selected, or may be in accordance with a predetermined rule. Regardless of whether parity bit 1 or parity bit 2 is selected, The parity bit corresponding to the systematic bit output to mapping section 300-1 is output to mapping section 300-12.
- the systematic bits are modulated by the mapping section 300-1 in the modulation scheme specified by the modulation scheme instruction section 500, and symbol mapped.
- the mapping section 300-2 modulates the parity bits in the modulation scheme designated by the modulation scheme designating section 500 and performs symbol mapping.
- the modulation scheme instructing section 500 0 designates different modulation schemes as modulation schemes to be applied to systematic bits and parity bits, so that the mapping sections 300-1 and 300-0-2 Performs modulation using different modulation schemes.
- modulation scheme instruction section 500 instructs matching section 300-1 to perform BPSK modulation, and instructs mapping section 300-2 to perform QPSK modulation.
- the transmission efficiency of the parity bit is higher than that of the systematic bit, the error coding gain by turbo coding is further increased, and the accuracy of the demodulated data obtained in the receiving device is increased.
- the modulation scheme instructing unit 500 instructs the mapping unit 300-1 to perform QPSK modulation, and instructs the matching unit 300-2 to perform BPSK modulation.
- the transmission efficiency of systematic bits is increased, and the transmission rate of information can be increased.
- degeneration is less likely to occur in the receiving apparatus than in the case where QPSK modulation is performed on both systematic bits and parity bits.
- the systematic bits and parity bits modulated and symbol-mapped in this way are subjected to predetermined radio transmission processing (D / A conversion, up-conversion) by radio transmission sections 400-1 and 400-2, respectively. Conversion, etc.), and transmitted from the corresponding antennas 450-0-1, 450-0-2. These antennas The signals transmitted from 450-0-1, 450-0-2 are multiplexed in the air and then received by the receiver.
- FIGS. 3A and 3B are diagrams illustrating an example of a state in which systematic bits and parity bits modulated by different modulation schemes are multiplexed in the air.
- FIGS. 3A and 3B show an example in which the most degenerate occurs in the receiving apparatus.
- degeneracy occurs at points other than 16 points indicated by black dots in the figure. %. Also in this case, it is smaller than 98% when both the systematic bits and the parity bits are subjected to 16 QAM modulation.
- puncturing of parity bits is performed so as to absorb differences between different modulation schemes used for systematic bits and parity bits, and systematic bits are punctured by different modulation schemes.
- the diversity gain and the coding gain by space-time tapo coding are compatible, and the Reduces the probability of degeneration and increases interference power It is possible to prevent the demodulation performance from deteriorating without causing the demodulation.
- a feature of Embodiment 2 of the present invention is that parity bit 1 and parity bit 2 are mapped to the in-phase axis and the orthogonal axis, respectively, in order to reduce interference between parity bits.
- FIG. 4 is a block diagram showing a main configuration of the space-time turbo coding apparatus according to the present embodiment.
- the space-time turbo coding device shown in FIG. 4 includes a turbo coding unit 100, a selection unit 200, a mapping unit 300-0-1, 300-2, and a radio transmission unit 400-1, 400. It is mainly composed of 0-2, a modulation scheme instructing section 500, and a bit arrangement determining section 600.
- the bit arrangement determination unit 600 converts the two parity bits output from the selection unit 200 into an in-phase axis and a quadrature axis under the parity bit modulation scheme designated by the modulation scheme indication unit 500. The bit arrangement is determined so as to be mapped, and the determined bit arrangement is notified to the mapping section 300-2.
- turbo data is turbo-coded by turbo coding section 100.
- turbo coding the obtained systematic bits are output to mapping section 300-1, and the parity bits are output from selection section 200 to mapping section 300-12.
- the system is controlled by the mapping section 300-1 so that the bit arrangement determined by the modulation arrangement instruction section 500 and the bit arrangement determined by the bit arrangement determination section 600 are performed.
- the matic bits are modulated and symbol mapped.
- the mapping section 300-2 the modulation scheme instructed by the modulation scheme instructing section 500 and the bit allocation determining section 600 , So that the bit arrangement is determined as follows. Bit is modulated and symbol mapped.
- modulation scheme instructing section 500 designates different modulation schemes as modulation schemes applied to systematic bits and parity bits.
- the units 300-2 perform modulation of different modulation schemes.
- bit arrangement determining section 600 determines the bit arrangement such that parity bits are mapped on the in-phase axis and the orthogonal axis.
- the bit arrangement is determined so that the parity bit (P1) is arranged on the in-phase axis and the second parity bit (P2) is arranged on the orthogonal axis.
- the first parity bit (P11) convolutionally coded by the encoder 1 2 0—1 and the first parity bit (P12) convolutionally coded by the encoder 1 2 0—2 are in phase.
- the second parity bit (P21) that is placed on the axis and convolutionally coded by the encoding unit 120-1 and the second parity bit that is convolutionally coded by the encoding unit 120-2 (P21) The bit arrangement is determined so that P22) is arranged on the orthogonal axis.
- the 'determined bit arrangement' is reported to the mappings
- the mapping section 300_1 the systematic bits are modulated and subjected to symbol / remapping.
- the 'mapping section 300-2 the parity bit is modulated and symbol-mapped.
- the modulated systematic bits and parity bits are subjected to predetermined radio transmission processing (D / A conversion, up-conversion, etc.) by the radio transmission sections 400-1 and 400-2, respectively. Is transmitted and transmitted from the corresponding antennas 450-0-1, 450-0-2. The signals transmitted from these antennas 450-1 and 450-2 are multiplexed in the air and then received by the receiver.
- D / A conversion, up-conversion, etc. predetermined radio transmission processing
- the systematic bits and the parity bits are modulated by different modulation schemes. Symbol bits so that the parity bits are arranged on the in-phase axis and the orthogonal axis, respectively, and the systematic bits and the parity bits are transmitted from different antennas.Therefore, the probability of occurrence of degeneration in the receiving device is suppressed, and the interference power is reduced. Degradation of the demodulation performance can be prevented without increasing, and interference between parity bits can be reduced.
- a feature of Embodiment 3 of the present invention is that bit arrangement is performed so as to equalize the reception quality when parity bit 1 and parity bit 2 generated as a result of turbo coding are received.
- the configuration of the main part of the space-time turbo coding apparatus according to the present embodiment is the same as that of the space-time turbo coding apparatus according to Embodiment 2 (FIG. 4), and a description thereof will be omitted.
- the operation of bit arrangement determining section 600 is different from that of the second embodiment.
- bit arrangement determining section 600 is configured to perform two parity bits output from selecting section 200 under the modulation scheme of the parity bit indicated by modulation scheme indicating section 500. The bit arrangement is determined so that is mapped in the in-phase axis and the orthogonal axis. Further, the bit arrangement determination unit 600 0 determines whether the parity bit 1 convolutionally coded by the encoding unit 120-1 and the parity bit 2 convolutionally coded by the encoding unit 120-2 are different. Determine the bit arrangement so that the arrangement is different.
- the bit arrangement determination unit 600 instructs the modulation scheme instruction unit 500 to apply QPSK modulation to systematic bits and apply 16 QAM modulation to parity bits.
- the parity bits (Pll, P12) convolutionally coded by the coding unit 120-1 are arranged on the same phase axis as in the second embodiment.
- the parity bits (P21, P22) convolutionally coded by the coding unit 120-2 are arranged on the orthogonal axis after the order of the bits is changed.
- the parity bits (Pll, P21) convolutionally coded by the coding unit 120-1 if the bits take different values, In contrast to the fact that the quadrants on the coordinates consisting of the arrangement axes are always different, the parity bits (P12, P22) convolutionally coded by the coding unit 120-2 have different values taken by the bits. The quadrants on the coordinates may be the same. Therefore, the reception quality of the parity bits P11 and P21 in the reception device is relatively good, whereas the reception quality of the parity bits P12 and P22 in the reception device always deteriorates.
- parity bit P 21 and parity bit P 22 The reception quality of the parity bit P 22 convolutionally coded by the coding unit 120-2 becomes relatively good, and the coding unit 122-1 and the coding unit 122- Regardless of which of the two methods is used for convolutional coding, the parity bit reception quality is uniform.
- the parity bit is used. Since some of the bit arrangements are switched between bit 1 and parity bit 2 and the systematic bits and parity bits are transmitted from different antennas, the probability of degeneration at the receiving device is suppressed and the interference power is not increased. Degradation performance can be prevented from deteriorating, interference between parity bits can be reduced, and reception quality becomes uniform among a plurality of parity bit sequences.
- a feature of Embodiment 4 of the present invention is that the bit arrangement of systematic bits and parity bits is changed according to the number of retransmissions.
- FIG. 7 is a block diagram showing a main configuration of a space-time turbo coding apparatus according to the present embodiment.
- the space-time turbo coding apparatus shown in the figure the same parts as those in the space-time turbo coding apparatus shown in FIGS. 2 and 4 are denoted by the same reference numerals, and description thereof will be omitted.
- the space-time turbo coding apparatus shown in FIG. 7 includes a turbo coding unit 100, a selection unit 200, a muting unit 300-0-1, 300-2, and a radio transmission unit 400-1, 400. 0-2, a modulation scheme instructing section 500, a bit arrangement determining section 600, an arrangement axis exchanging section 700, and a retransmission control section 800.
- Bit arrangement determining section 600 determines the bit arrangement of the parity bits according to the control of retransmission control section 800 as in the second embodiment or the third embodiment. In other words, the bit arrangement determining unit 600 assigns the parity bit to the in-phase axis and the orthogonal axis, respectively. The mapping is performed on the in-phase axis and the orthogonal axis, respectively, and the bit arrangement is determined so that the arrangement of the parity bit 1 and the parity bit 2 is different.
- the arrangement axis switching unit 700 exchanges the arrangement axes in the bit arrangement determined by the bit arrangement determination unit 600 according to the control of the retransmission control unit 800.
- Retransmission control section 800 controls bit arrangement determination section 600 and arrangement axis switching section 700 in accordance with retransmission number information indicating the number of retransmission requests for the same data from the receiving apparatus. .
- retransmission control section 800 operates bit arrangement determination section 600 and arrangement axis switching section 700 so that the bit arrangement of systematic bits and parity bits differs for each retransmission count. Decide whether or not you want it to work.
- the reason why the same data needs to be retransmitted is that the data received by the receiving device includes many errors due to the effects of fading on the propagation path and the like, and the predetermined quality is not satisfied. is there. Therefore, for example, when the fading fluctuation is slow, even if a signal with the same bit arrangement is transmitted at the time of retransmission, there is a high possibility that the same error will occur again. Therefore, in the present embodiment, a signal is transmitted with a different bit arrangement for each retransmission count.
- the modulation scheme designating section 500 has given an instruction to apply QPSK modulation to systematic bits and apply 16 QAM modulation to parity bits. I do.
- turbo data is turbo-coded by turbo coding section 100.
- turbo coding the obtained systematic bits 1 are output to the mapping section 300-1, and the parity bits are output from the selection section 200 to the mapping section 300-2.
- retransmission control section 800 detects the number of retransmissions, and bit arrangement determination section 6 ⁇ 0 and arrangement axis input. It is determined whether to operate the replacement unit 700.
- bit arrangement determination section 600 is controlled by retransmission control section 800, so that both systematic bits and parity bits are arranged on the in-phase axis and the orthogonal axis. Further, the bit arrangement of the parity bits output second from the encoding section 120-1 and the encoding section 120-2 is exchanged (see FIG. 8A). Also, the arrangement axis replacement unit 700 does not operate. That is, when the number of retransmissions is 0, the same bit arrangement as in the third embodiment is employed.
- mapping sections 300-1 and 300-2 respectively.
- the mapping section 300-1 the systematic bits are modulated and sympolated.
- the mapping section 300-2 the parity bits are modulated and symbol-mapped.
- the modulated and symbol mapped systematic bits and parity bits are subjected to predetermined radio transmission processing (DZA conversion, up-conversion, etc.) by radio transmission sections 400_1 and 400-2, respectively. Sent from the corresponding antenna 450-1-1 and 450-0-2. The signals transmitted from these antennas 450-1 and 450-2 are multiplexed in the air and then received by the receiving device.
- DZA conversion, up-conversion, etc. radio transmission processing
- a retransmission request is issued from the receiving apparatus.
- the retransmission request is received by a receiving unit (not shown), and the number of times the retransmission request is received is input to retransmission control unit 800 as retransmission number information.
- retransmission control section 800 detects that the number of retransmissions is one.
- transmission data requested to be retransmitted is turbo-coded by re-turbo coding unit 100.
- the obtained systematic bits are output to mapping section 300-1, and the parity bits are output from selection section 200 to matching section 300-12.
- the bit arrangement determination section 600 is controlled by the retransmission control section 800 so that both the systematic bits and the parity bits are arranged on the in-phase axis and the orthogonal axis. Then, the bit arrangement of the parity bits output first from the encoding unit 120-1 and the encoding unit 120-2 is exchanged (see FIG. 8B). Also, the arrangement axis replacement unit 700 does not operate. Thus, when the number of retransmissions is 1, the same error is prevented from occurring on the propagation path by changing the bit arrangement as compared with the case where the number of retransmissions is 0.
- a second retransmission request is issued from the receiving apparatus, and the retransmission number information is input to retransmission control section 800.
- retransmission control section 800 detects that the number of retransmissions is 2. Then, the transmission data for which retransmission has been requested is turbo-coded by turbo coding section 100 again. Then, in the same manner as described above, the obtained systematic bit is output to the mapping section 300_1. The priority bit is output from the selection unit 200 to the mapping unit 300-2.
- the bit arrangement determination section 600 is controlled by the retransmission control section 80 °, so that both the systematic bits and the parity bits are arranged on the in-phase axis and the orthogonal axis.
- the bit arrangements of the parity bits output second from the encoders 1 2 0-1 and 1 2 0-2 are interchanged.
- the arrangement axis exchanging unit 700 exchanges the arrangement axes of the coordinates where the systematic bits and the parity bits are arranged (see FIG. 8C).
- the systematic bits and parity bits are modulated by different modulation schemes, the bit arrangement is changed each time retransmission is requested, and the systematic bits and parity bits are respectively different. Since the signal is transmitted from the antenna, the probability of occurrence of degeneration in the receiving device can be suppressed, demodulation performance can be prevented from deteriorating without increasing interference power, and retransmission should be performed when fusing fluctuations are slow. However, the same error can be prevented from occurring, and the throughput of the entire system can be improved.
- the arrangement axes are exchanged when the number of retransmissions is 2, but the combination of changing the bit arrangement and the arrangement axes may be changed in various ways. it can.
- a combination of BPSK modulation and QPSK modulation and a combination of QPSK modulation and 16 QAM modulation have been described as examples, but the present invention is not limited to these.
- any combination of modulation schemes such as a combination of 16QAM modulation and 64QAM modulation and a combination of BPSK modulation and 16QAM modulation may be used as long as the modulation schemes are different from each other.
- the force S described as having two antennas is not limited to this, and the number of antennas may be any number as long as it is plural.
- the coding apparatus of the present invention includes coding means for coding transmission data to output systematic bits and parity bits, and modulating the output systematic bits and parity bits by different modulation schemes. And a transmitting means for transmitting the modulated systematic bits and parity bits from a plurality of corresponding antennas.
- the systematic bits and parity bits obtained by encoding are modulated by different modulation schemes and transmitted from a plurality of corresponding antennas, the transmitted systematic bits and parity bits are transmitted. Even if bits are multiplexed, the probability of occurrence of degeneration is low, and deterioration of demodulation performance can be prevented without increasing interference power.
- the encoding device may further include a modulation scheme instruction unit that applies different modulation schemes to the systematic bits and the parity bits, and the modulation unit according to the applied modulation scheme.
- a modulation scheme instruction unit that applies different modulation schemes to the systematic bits and the parity bits, and the modulation unit according to the applied modulation scheme.
- a configuration having a bit arrangement determining unit that determines the bit arrangement of systematic bits and parity bits, and a muting unit that symbol-move the systematic bits and parity bits with the determined bit arrangement is adopted.
- the modulation scheme instruction unit applies a modulation scheme having a higher modulation level than the systematic bits to the parity bits, and determines the bit arrangement.
- the unit employs a configuration that determines a bit arrangement for arranging the parity bits on the in-phase axis and the orthogonal axis.
- the encoding device may output a plurality of parity bits for one systematic bit, and the bit arrangement determination unit may output the plurality of parity bits for the plurality of parity bits.
- a configuration is adopted in which different bit arrangements are determined.
- a plurality of parity bits are output for one systematic bit, and different bit arrangements are determined for the plurality of parity bits.
- the encoding apparatus of the present invention in the above configuration, further includes: an arrangement axis exchanging unit for exchanging an arrangement axis of coordinates for performing the bit arrangement determined by the bit arrangement determining unit.
- the mapping unit employs a configuration in which the systematic pits and the parity bits are symbol-mapped by the bit arrangement at the coordinates after the arrangement axes are exchanged.
- the encoding apparatus of the present invention in the above-described configuration, further comprises: a detecting unit configured to detect a number of retransmissions of transmission data, wherein the bit arrangement determination unit determines the number of retransmissions of the transmission data according to the detected number of retransmissions.
- a detecting unit configured to detect a number of retransmissions of transmission data
- the bit arrangement determination unit determines the number of retransmissions of the transmission data according to the detected number of retransmissions.
- the configuration to change the bit arrangement of the parity bit is adopted. '
- the present invention can be applied to a wireless communication system including a transmitting device and a receiving device, for example, a wireless device mounted on a mobile station device, a base station device, or the like in a mobile communication system.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
- Theoretical Computer Science (AREA)
- Error Detection And Correction (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04722645A EP1619801A4 (en) | 2003-03-25 | 2004-03-23 | CODING DEVICE AND CODING METHOD |
CN200480008281XA CN1765056B (zh) | 2003-03-25 | 2004-03-23 | 编码设备和编码方法 |
US10/549,615 US7180967B2 (en) | 2003-03-25 | 2004-03-23 | Coding apparatus and coding method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003083500A JP4224329B2 (ja) | 2003-03-25 | 2003-03-25 | 符号化装置および符号化方法 |
JP2003-083500 | 2003-03-25 |
Publications (1)
Publication Number | Publication Date |
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WO2004086634A1 true WO2004086634A1 (ja) | 2004-10-07 |
Family
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Family Applications (1)
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PCT/JP2004/003907 WO2004086634A1 (ja) | 2003-03-25 | 2004-03-23 | 符号化装置および符号化方法 |
Country Status (5)
Country | Link |
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US (1) | US7180967B2 (ja) |
EP (1) | EP1619801A4 (ja) |
JP (1) | JP4224329B2 (ja) |
CN (1) | CN1765056B (ja) |
WO (1) | WO2004086634A1 (ja) |
Cited By (1)
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EP1845648A1 (en) * | 2005-02-28 | 2007-10-17 | Matsushita Electric Industrial Co., Ltd. | Retransmission control scheme and wireless communication apparatus |
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KR20050065295A (ko) * | 2003-12-23 | 2005-06-29 | 삼성전자주식회사 | 보조 심볼을 이용한 시공간 블록 부호 인코딩 방법 |
US9385843B2 (en) | 2004-12-22 | 2016-07-05 | Qualcomm Incorporated | Method and apparatus for using multiple modulation schemes for a single packet |
KR100809551B1 (ko) * | 2005-03-08 | 2008-03-04 | 재단법인서울대학교산학협력재단 | 이동 통신 시스템에서 귀환 비트를 이용하여 메시지를 시공간 터보 부호화하여 송신하는 장치 및 방법 |
CN1832392A (zh) | 2005-03-11 | 2006-09-13 | 松下电器产业株式会社 | 多入多出系统中数据重传的方法和设备 |
RU2007136105A (ru) * | 2005-03-29 | 2009-04-10 | Мацусита Электрик Индастриал Ко., Лтд. (Jp) | Передающее устройство mimo, приемное устройство mimo и способ повторной передачи |
GB0608433D0 (en) * | 2006-04-28 | 2006-06-07 | Obrist Closures Switzerland | Closure with RFID device |
KR101509728B1 (ko) | 2008-06-05 | 2015-04-06 | 한국전자통신연구원 | 심볼 매핑 방법 및 장치 |
WO2009148272A2 (en) * | 2008-06-05 | 2009-12-10 | Electronics And Telecommunications Research Institute | Apparatus and method for mapping symbol |
JP4935790B2 (ja) | 2008-10-09 | 2012-05-23 | 富士通株式会社 | 通信システム |
CN101807948A (zh) * | 2009-02-18 | 2010-08-18 | 雷凌科技股份有限公司 | 多天线系统的调制及编码方案的选择方法 |
JP5052639B2 (ja) * | 2010-03-31 | 2012-10-17 | 株式会社東芝 | 送信装置および受信装置 |
ES2439143B1 (es) * | 2012-07-18 | 2015-02-13 | Telefónica, S.A. | Método y sistema que implementan un esquema de turbo-diversidad para sistemas ofdm inalámbricos |
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Also Published As
Publication number | Publication date |
---|---|
CN1765056A (zh) | 2006-04-26 |
JP2004297182A (ja) | 2004-10-21 |
CN1765056B (zh) | 2011-10-12 |
EP1619801A4 (en) | 2006-05-24 |
EP1619801A1 (en) | 2006-01-25 |
JP4224329B2 (ja) | 2009-02-12 |
US20060077076A1 (en) | 2006-04-13 |
US7180967B2 (en) | 2007-02-20 |
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