EP1329070A2 - Procede de production de donnees binaires souples a partir de signaux a codage gray - Google Patents

Procede de production de donnees binaires souples a partir de signaux a codage gray

Info

Publication number
EP1329070A2
EP1329070A2 EP01987987A EP01987987A EP1329070A2 EP 1329070 A2 EP1329070 A2 EP 1329070A2 EP 01987987 A EP01987987 A EP 01987987A EP 01987987 A EP01987987 A EP 01987987A EP 1329070 A2 EP1329070 A2 EP 1329070A2
Authority
EP
European Patent Office
Prior art keywords
bit information
phase
soft bit
gray
channel
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP01987987A
Other languages
German (de)
English (en)
Inventor
Volker Aue
René NUESSGEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NXP Semiconductors Germany GmbH
Original Assignee
Systemonic AG
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 Systemonic AG filed Critical Systemonic AG
Publication of EP1329070A2 publication Critical patent/EP1329070A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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

Definitions

  • the invention relates to a method for generating soft bit information from gray-coded signals.
  • TCM trellis coded modulation
  • BICM Bit-Interleaved Coded Moulation
  • gray coding plays a crucial role here. Adjacent symbols in the constellation diagram only differ by one different bit.
  • the soft information per bit results from the maximum conditional probability that a data symbol was received under the condition that a specific data symbol was sent.
  • the high computational effort consists on the one hand of calculating several conditional probabilities and on the other hand of an additional division with the channel transmission function. This additional division must be applied if one assumes BICM (Bit Interleaved Coded Modulation) and fading. In practice, the individual bits are also interleaved using different symbols.
  • BICM Bit Interleaved Coded Modulation
  • the invention is based on the object, the soft bit information with at least the same performance in terms of bit or. Calculate symbol error rates with less computing and hardware expenditure in order to be able to implement them in real-time systems with high time requirements.
  • the object in a method for generating soft bit information from Gray-coded signals is achieved on the process side by utilizing the Gray coding used in most cases and generating the soft bit information per bit by simple amount formation and subtraction he follows.
  • the complex receive symbols Y are multiplied by the conjugate complex value of the estimated channel transmission function H * (for transmission in the frequency domain) in order to eliminate a possible phase shift caused by the channel.
  • Time domain contains H * the channel coefficient, which results from the attenuation of the signal and phase shift.
  • Y is the received symbol.
  • S is the transmitted signal
  • H is the transfer function
  • N is the corresponding noise term.
  • the received symbol is corrected in the phase and weighted with the amplitude of the channel
  • a QAM signal can be interpreted as two ASK signals due to the orthogonality of the in-phase and quadrature components.
  • the soft bit information D (R, S) ⁇ for the in-phase or quadrature components for an m -value QAM symbol become after
  • Rt ⁇ R ⁇ denotes the real part of a complex number, Ira ⁇ i. ⁇ Denotes the imaginary part.
  • the shift factor s results from the threshold value for a hard decision for the corresponding bit and the channel transfer function H and is calculated as follows.
  • the threshold v ⁇ . is calculated as follows.
  • M is the number of constellation points in the complex signal level.
  • Id denotes the logarithm of duales.
  • FIG. 1 shows a gray coding in which the following gray code was used for the in-phase component of a 64-QAM symbol. The individual calculation steps for bit 2 and bit 3 are illustrated.
  • the Gray code is documented in the following table.
  • FIG. 2 shows a further gray coding in which a different gray code was used for the in-phase component of a 64-QAM symbol.
  • the Gray code is documented in the following table.
  • the first soft bit D (R, S) 1.4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Error Detection And Correction (AREA)

Abstract

L'invention concerne un procédé de production de données binaires souples à partir de signaux à codage Gray. L'invention vise à calculer les données binaires souples avec au moins les mêmes performances et taux d'erreurs sur les binaires et symboles et ce, à moindre coût en termes de calcul et de matériel afin de pouvoir effectuer une application correspondante dans des systèmes temps réel avec de grandes exigences en temps. Pour ce faire, on utilise le codage Gray pour générer les données binaires souples par binaire par simple addition et soustraction. Avant le calcul de binaires souples à proprement dit, on multiplie les symboles de réception complexes Y, sachant que Y = S.H+N, par la valeur complexe conjuguée H<*> de la fonction de transfert de canal H, ce qui permet d'éliminer une rotation de phase due au canal. Après la multiplication complexe et la considération d'une estimation de canal idéale, on obtient le symbole de réception R = S.¦H¦<2> + NH<*> corrigé dans la phase et pondéré par l'amplitude du canal. On calcule la donnée binaire souple D(R,S)i de la composante en phase ou quadrature d'un symbole QAM à valeur m selon D(R,S)1 = Re{R} pour les composantes en phase et selon D(R,S)1 = Im{R} pour les composantes quadrature et D(R,S)i = -abs(D(R,S)i-1)+Si pour i>/=2, sachant que les facteurs de déplacement Si représentent Si = VTi¦H¦<2> et les valeurs seuil VTi où Vti = 2<ld(m)/2-(i-1)>.
EP01987987A 2000-10-16 2001-10-15 Procede de production de donnees binaires souples a partir de signaux a codage gray Ceased EP1329070A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10051283 2000-10-16
DE10051283 2000-10-16
PCT/DE2001/003917 WO2002033919A2 (fr) 2000-10-16 2001-10-15 Procede de production de donnees binaires souples a partir de signaux a codage gray

Publications (1)

Publication Number Publication Date
EP1329070A2 true EP1329070A2 (fr) 2003-07-23

Family

ID=7659994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01987987A Ceased EP1329070A2 (fr) 2000-10-16 2001-10-15 Procede de production de donnees binaires souples a partir de signaux a codage gray

Country Status (6)

Country Link
US (1) US20040096007A1 (fr)
EP (1) EP1329070A2 (fr)
JP (1) JP2004512742A (fr)
AU (1) AU2002218138A1 (fr)
DE (1) DE10194477D2 (fr)
WO (1) WO2002033919A2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030017886A (ko) * 2001-08-23 2003-03-04 한국전자통신연구원 비트 단위 복호를 위한 소프트 비트 값 산출 방법 및 이방법을 사용하는 통신 시스템
DE10260348A1 (de) * 2002-12-20 2004-07-15 Ingenieurbüro Ludwig Schäffler Verfahren und Vorrichtung zum Soft-Decodieren einer Folge von Nutzdaten-Bits, Signalempfangs- und -decodiereinrichtung und Telekomunikationseinreinrichtung
RU2380847C2 (ru) * 2003-06-23 2010-01-27 Хонг-Сеок СЕО Способ и устройство демодуляции с использованием мягкого решения для квадратурной амплитудной модуляции
US7154966B2 (en) 2003-06-30 2006-12-26 Telefonaktiebolaget L M Ericsson (Publ) Method and system for M-QAM detection in communication systems
US7502426B2 (en) * 2003-09-09 2009-03-10 Interdigital Technology Corporation Method for estimating signal magnitude, noise power, and signal-to-noise ratio of received signals
US20060029162A1 (en) * 2004-08-06 2006-02-09 Stmicroelectronics, Inc. Modular multi-bit symbol demapper
TWI387274B (zh) * 2005-12-07 2013-02-21 Hong-Seok Seo 使用軟性決策用於正交振幅調變之調解變方法及其裝置
US7844879B2 (en) * 2006-01-20 2010-11-30 Marvell World Trade Ltd. Method and system for error correction in flash memory
US7912140B2 (en) * 2007-03-26 2011-03-22 Lantiq Israel Ltd. Reducing computational complexity in maximum likelihood MIMO OFDM decoder
US8340202B2 (en) 2010-03-11 2012-12-25 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for efficient soft modulation for gray-mapped QAM symbols

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6078626A (en) * 1997-09-24 2000-06-20 Ericsson Inc. Methods and systems for communicating information using separable modulation constellations
DE19912825C1 (de) * 1999-03-22 2000-08-10 Siemens Ag Verfahren, Empfangseinrichtung und Funkstation zum Detektieren eines Datensymbols
US6977972B1 (en) * 2000-07-12 2005-12-20 Sharp Laboratories Of America, Inc. Method of hybrid soft/hard decision demodulation of signals with multilevel modulation
WO2002056559A1 (fr) * 2001-01-16 2002-07-18 Koninklijke Philips Electronics N.V. Mappage par modulation a codage par entrelacement de bits

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0233919A2 *

Also Published As

Publication number Publication date
DE10194477D2 (de) 2003-10-30
WO2002033919A3 (fr) 2002-08-29
WO2002033919A2 (fr) 2002-04-25
AU2002218138A1 (en) 2002-04-29
US20040096007A1 (en) 2004-05-20
JP2004512742A (ja) 2004-04-22

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