WO2008001456A1 - Procédé et dispositif de réception de signal à modulation multivaleur - Google Patents

Procédé et dispositif de réception de signal à modulation multivaleur Download PDF

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Publication number
WO2008001456A1
WO2008001456A1 PCT/JP2006/313068 JP2006313068W WO2008001456A1 WO 2008001456 A1 WO2008001456 A1 WO 2008001456A1 JP 2006313068 W JP2006313068 W JP 2006313068W WO 2008001456 A1 WO2008001456 A1 WO 2008001456A1
Authority
WO
WIPO (PCT)
Prior art keywords
likelihood
symbol
modulation signal
calculating
bits constituting
Prior art date
Application number
PCT/JP2006/313068
Other languages
English (en)
Japanese (ja)
Inventor
Masahiko Shimizu
Akira Ito
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2006/313068 priority Critical patent/WO2008001456A1/fr
Priority to JP2008522259A priority patent/JP4900388B2/ja
Publication of WO2008001456A1 publication Critical patent/WO2008001456A1/fr

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Classifications

    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • 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
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/45—Soft decoding, i.e. using symbol reliability information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation

Definitions

  • the present invention relates to a multilevel modulation signal receiving method and a multilevel modulation signal receiving apparatus, and performs decoding after calculating the likelihood of each of a plurality of bits constituting a signal power symbol obtained by demodulating a received multilevel modulation signal.
  • the present invention relates to a multilevel modulation signal receiving method and a multilevel modulation signal receiving apparatus.
  • digital data for wireless communication is signal-processed as binary values (0 or 1). Even when multi-level modulation such as QAM or 8PSK is used as the modulation method, data decoding is often processed as binary.
  • Fig. 1 (A) shows the constellation of signal points in 16QAM modulation.
  • the horizontal axis is the I channel, and the vertical axis is the Q channel.
  • the probability P that the I channel symbol is a bit pattern of 0, 0 is 0.65, as shown in Fig. 1 (B).
  • the probability P of 0, 1 is 0.2, and the probability P of 1, 0 is 0.1
  • the probability P of 0, 0 0, 1 1, 0 and 1, 1 is 0.05.
  • the likelihood of the MSB (most significant bit) of the I channel is log [(P + P) / (P + P
  • Patent Document 1 the likelihood of each quadrature component determination value of a QAM received signal is obtained, the bit likelihood is calculated therefrom, and the bit likelihood of the bit string that matches the bit string based on the result. It is described that the signal is demodulated by correcting so that the value becomes the maximum value.
  • Patent Document 2 describes that the probability of occurrence of a signal point itself is used as a likelihood in decoding a convolutionally coded signal.
  • Patent Document 1 Japanese Patent Laid-Open No. 6-6400
  • Patent Document 2 JP-A-9 284348
  • the multi-level (2 bits in Fig. 1) likelihood is converted to bit-wise likelihood, and Viterbi decoding, turbo in bit units. Processing such as decryption is performed.
  • log (Q M / Q M ) log [(P + P) / (P + P)]
  • P is the likelihood given by other bits.
  • MSB likelihood log (q / q) and LSB likelihood log (r / r) of I channel symbol 2 (transmitted previously with the same value as symbol 1) are expressed by the following equations.
  • log (X M / X 1V1 ) log (Q M / Q M -q / q)
  • Figure 4 shows the conventional H-ARQ.
  • the present invention has been made in view of the above points, and is capable of calculating the likelihood of each bit with high accuracy by effectively utilizing the correlation between bits in a symbol of multilevel modulation. It is a general object to provide a modulation signal receiving method and a multi-level modulation signal receiving apparatus. Means for solving the problem
  • the multilevel modulation signal receiving method of the present invention demodulates the received multilevel modulation signal into a multilevel symbol, and the symbol is obtained from the demodulated multilevel symbol.
  • Each of the plurality of bits constituting the symbol, the step of demapping and calculating the likelihood of each of the plurality of bits constituting the symbol and the step of performing decoding based on the likelihood of each of the calculated bits In this step, the likelihood is calculated using the likelihood of the bits constituting the same symbol obtained in the past.
  • the likelihood of each bit can be calculated with high accuracy by effectively utilizing the inter-bit correlation in the multi-level modulation symbol.
  • FIG. 1 is a diagram showing signal point constellation in 16QAM modulation.
  • FIG. 2 A diagram showing how Viterbi decoding is performed after converting 16QAM I-channel symbols to bit-wise likelihood.
  • FIG. 3 is a diagram illustrating a state in which retransmission control or repetition is performed.
  • FIG. 4 A diagram showing the state of conventional H-ARQ synthesis.
  • FIG. 5 is a block configuration diagram of an embodiment of a mobile communication terminal to which the multi-level modulation signal receiving apparatus of the present invention is applied. 6] It is a block configuration diagram of the main part of the multilevel modulation signal receiving apparatus of the present invention.
  • FIG. 7 is a diagram for explaining an embodiment using iterative calculation for H-ARQ synthesis.
  • Fig. 8 is a diagram showing a simple method for calculating the MSB likelihood.
  • Fig. 10 is a diagram showing a simple method for calculating the LSB likelihood.
  • FIG. 12 is a diagram for explaining an embodiment using iterative calculation for repetition synthesis.
  • FIG. 13 is a diagram for explaining an embodiment using iterative calculation for turbo decoding.
  • FIG. 5 shows a block configuration diagram of an embodiment of a mobile communication terminal to which the multi-level modulation signal receiving apparatus of the present invention is applied.
  • a transmission signal processing unit 10 outputs transmission data subjected to processing such as error correction code including a turbo code, retransmission control, interleaving, and spreading code.
  • the transmission data is converted to analog by the D / A converter 11 and supplied to the radio unit 12, where the multilevel orthogonal modulation and frequency-converted transmission signal is transmitted from the antenna 14 via the coupling unit 13.
  • the signal received by the antenna 14 is supplied to the radio unit 15 via the coupling unit 13, where the received signal is subjected to frequency conversion and multi-level orthogonal detection, digitized by the AZD converter 16, and demodulated to the demodulating unit 17 , Despread, rake-combined, and the resulting I channel and Q channel symbols are demapped into bits.
  • the rate matching unit 18 performs rate matching
  • the H-ARQ unit 19 performs retransmission control
  • the decoding unit 20 performs decoding of error correction codes including din-leave and turbo codes, thereby performing signal processing. Supplied to part 21.
  • the signal processing unit 21 converts the decoded audio data and video data into audio signals and video signals and outputs them to speakers and displays.
  • the likelihood of the symbols obtained in the past in the buffer power of each of the late matching unit 18, H-ARQ unit 19, and decoding unit 20 is supplied to the demodulating unit 17, and a new one calculated by the demodulating unit 17 is obtained.
  • the likelihood of the symbol is stored in the buffers of the rate matching unit 18, H-ARQ unit 19, and decoding unit 20, respectively.
  • FIG. 6 shows a block configuration diagram of a main part of the multilevel modulation signal receiving apparatus of the present invention.
  • a rake combining unit 25 is a part of the demodulating unit 17 and performs rake combining, and outputs a signal amplitude X of an I channel (and Q channel) symbol.
  • the signal amplitude X of this symbol is supplied to the threshold calculation unit 26 and also to the MSB demapping unit 27 and the LSB demapping unit 28.
  • the threshold value calculation unit 26 calculates a threshold value K from the signal amplitude X of the symbol demodulated this time and supplies it to the MSB demapping unit 27 and the LSB demapping unit 28.
  • the threshold value K is the amplitude from the origin to the 0, 0 bit pattern as shown in Fig. 1 (A).
  • the MSB demapping unit 27 is one of the late matching unit 18, the H-ARQ unit 19, and the decoding unit 20.
  • the likelihood of the same LSB of the symbol obtained in the past from any of the buffer powers is set to terminal 29a.
  • Likelihood Y is from terminal 30a to late matching unit 18, H-ARQ unit 19, and decoding unit 20.
  • the MSB demapping unit 28 uses the buffer power of any of the late matching unit 18, H-ARQ unit 19, and decoding unit 20 as well as the likelihood Y of the same MSB of the symbol obtained in the past. 29
  • the likelihood Y of the LSB from the terminal 30b is the rate matching unit 18, the H—ARQ unit 19, and the decoding unit 2
  • FIG. 7 shows a diagram for explaining an embodiment using iterative calculation for H-ARQ synthesis.
  • the probability that a 16QAM I channel symbol is a 0, 0 bit pattern is P, and 0,
  • the likelihood of the same MSB of a symbol obtained in the past stored in the buffer (IR buffer) of the H—ARQ unit 19 is log (q (t) / q (t) ), Symbols sought in the past
  • log (Y M / Y M ) log [(r (t) P + r (t) P)
  • FIG. 8 is a diagram showing a simple method for calculating the MSB likelihood. This simple MSB likelihood calculation method was created based on equations (15) to (: 18).
  • the horizontal axis represents the amplitude X of the signal output from the rake combining unit 25
  • the threshold K is the amplitude from the origin to the bit pattern of 0,
  • Y is the value from the buffer of the H-ARQ unit 19 Past LS ⁇
  • a new MSB likelihood Y is calculated by the following equation.
  • Figure 9 shows the relationship between the signal amplitude X and the likelihood ⁇ ⁇ when the threshold ⁇ , which is the amplitude of the 0 and 0 bit patterns, is set to 1.
  • the alternate long and short dash line indicates the signal amplitude X in the conventional method.
  • FIG. 10 is a diagram showing a simple method for calculating the LSB likelihood. This simple LSB likelihood calculation method was created based on equations (15) to (: 18).
  • the horizontal axis represents the amplitude X of the signal output from the rake combiner 25
  • the threshold ⁇ is the amplitude of the bit pattern with 0,
  • ⁇ is the past MSB likelihood from the buffer of the H-ARQ unit 19.
  • a new LSB likelihood ⁇ is calculated by the following equation.
  • FIG. 12 is a diagram for explaining an embodiment using iterative calculation for repetition synthesis. Let ⁇ be the probability that a 16QAM I channel symbol is a 0, 0 bit pattern.
  • the probability of 0, 1 is 1, the probability of 1, 0 is ⁇ , and the probability of 1, 1 is ⁇
  • the likelihood of the same MSB of the symbol obtained in the past stored in the buffer of the rate matching unit 18 is defined as log (q () / q (t) ) and obtained in the past. Identical symbol
  • the number of times the operation is repeated that is, the number of repetitions.
  • the degree is log (r (t + 1) / r (t + 1) ) and stored again in the buffer of the late matching unit 18.
  • FIG. 13 is a diagram for explaining an embodiment using iterative calculation for turbo decoding.
  • the probability that a 16QAM I channel symbol is a 0, 0 bit pattern is P, and 0, 1
  • the likelihood of the same MSB of a previously obtained symbol stored in the buffer of the decoding unit 20 is defined as log (q (t) / q (t) ), and the symbol obtained in the past The likelihood of the same LSB
  • the degree is set as log (r (t + 1) / r (t + 1) ) and stored again in the buffer of the decoding unit 20.
  • the bit correlation in the symbol is conventionally ignored, but the symbol obtained in the past from the buffer of the H-ARQ unit, the rate matching unit, or the decoding unit is used. It is possible to obtain highly reliable bit information that takes into account bit correlation and improve receiver performance, such as improving throughput.
  • the threshold calculation unit 26, the MSB demapping unit 27, and the LSB demapping unit 28 include The threshold calculation unit 26 corresponds to the threshold calculation unit, the MSB demapping unit 27 corresponds to the MSB likelihood calculation unit, and the LSB demapping unit 28 corresponds to the LSB likelihood calculation unit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Theoretical Computer Science (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Error Detection And Correction (AREA)

Abstract

La présente invention concerne un procédé de réception de signal à modulation multivaleur consistant à : démoduler un signal modulé en multivaleur reçu en un symbole multivaleur et effectuer un décodage selon la probabilité de chacun des bits calculés. L'étape de calcul de la probabilité de chacun des bits constituant le symbole consiste à utiliser pour le calcul la probabilité des bits constituant le même symbole obtenu auparavant.
PCT/JP2006/313068 2006-06-30 2006-06-30 Procédé et dispositif de réception de signal à modulation multivaleur WO2008001456A1 (fr)

Priority Applications (2)

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PCT/JP2006/313068 WO2008001456A1 (fr) 2006-06-30 2006-06-30 Procédé et dispositif de réception de signal à modulation multivaleur
JP2008522259A JP4900388B2 (ja) 2006-06-30 2006-06-30 多値変調信号受信方法及び多値変調信号受信装置

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PCT/JP2006/313068 WO2008001456A1 (fr) 2006-06-30 2006-06-30 Procédé et dispositif de réception de signal à modulation multivaleur

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011087117A (ja) * 2009-10-15 2011-04-28 Mitsubishi Electric Corp 軟判定情報生成装置及び軟判定情報生成方法
WO2014091879A1 (fr) 2012-12-14 2014-06-19 三菱電機株式会社 Dispositif et procédé de décodage différentiel multi-niveau pour système de communication à modulation d'amplitude en quadrature

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003264535A (ja) * 2002-02-15 2003-09-19 Matsushita Electric Ind Co Ltd ハイブリッドａｒｑ再送方法およびそのための受信機

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005026913A (ja) * 2003-06-30 2005-01-27 Toshiba Corp 移動通信システム、同システムの基地局、同システムの移動局およびマッピングパラメータの選択方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003264535A (ja) * 2002-02-15 2003-09-19 Matsushita Electric Ind Co Ltd ハイブリッドａｒｑ再送方法およびそのための受信機

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011087117A (ja) * 2009-10-15 2011-04-28 Mitsubishi Electric Corp 軟判定情報生成装置及び軟判定情報生成方法
WO2014091879A1 (fr) 2012-12-14 2014-06-19 三菱電機株式会社 Dispositif et procédé de décodage différentiel multi-niveau pour système de communication à modulation d'amplitude en quadrature
US9143273B2 (en) 2012-12-14 2015-09-22 Mitsubishi Electric Corporation Multi-level differential decoding device and method for quadrature amplitude modulation communication system

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JPWO2008001456A1 (ja) 2009-11-26
JP4900388B2 (ja) 2012-03-21

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