WO2007092744B1 - Wireless communication unit and method for receiving a wireless signal - Google Patents

Wireless communication unit and method for receiving a wireless signal

Info

Publication number
WO2007092744B1
WO2007092744B1 PCT/US2007/061501 US2007061501W WO2007092744B1 WO 2007092744 B1 WO2007092744 B1 WO 2007092744B1 US 2007061501 W US2007061501 W US 2007061501W WO 2007092744 B1 WO2007092744 B1 WO 2007092744B1
Authority
WO
WIPO (PCT)
Prior art keywords
llr
signal
logic
communication unit
wireless communication
Prior art date
Application number
PCT/US2007/061501
Other languages
French (fr)
Other versions
WO2007092744A3 (en
WO2007092744A2 (en
Inventor
Jean Sidon
Yaniv Alon
Salomon Serfaty
Original Assignee
Motorola Inc
Jean Sidon
Yaniv Alon
Salomon Serfaty
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 Motorola Inc, Jean Sidon, Yaniv Alon, Salomon Serfaty filed Critical Motorola Inc
Priority to EP07763525A priority Critical patent/EP1985026A4/en
Publication of WO2007092744A2 publication Critical patent/WO2007092744A2/en
Publication of WO2007092744A3 publication Critical patent/WO2007092744A3/en
Publication of WO2007092744B1 publication Critical patent/WO2007092744B1/en

Links

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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • 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
    • 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
    • H03M13/47—Error detection, forward error correction or error protection, not provided for in groups H03M13/01 - H03M13/37
    • 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
    • H03M13/61—Aspects and characteristics of methods and arrangements for error correction or error detection, not provided for otherwise
    • H03M13/612—Aspects specific to channel or signal-to-noise ratio estimation
    • 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
    • H03M13/65—Purpose and implementation aspects
    • H03M13/6577—Representation or format of variables, register sizes or word-lengths and quantization
    • 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
    • H03M13/65—Purpose and implementation aspects
    • H03M13/6577—Representation or format of variables, register sizes or word-lengths and quantization
    • H03M13/6591—Truncation, saturation and clamping
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Noise Elimination (AREA)

Abstract

A wireless communication unit (100) comprises a receiver for receiving a wireless signal having signal-to-noise ratio (SNR) measurement logic (112) for measuring a SNR value of the received signal and signal processing logic (108) arranged to process the received wireless signal. The signal processing logic comprises demodulator logic (255) operably coupled to log likelihood ratio (LLR) logic (262) and decoding logic (265). A scaling factor (Q) is applied to the LLR logic (262) dependent upon the measured signal-to-noise ratio.

Claims

received by the International Bureau on 22 Apr 2008 (22.04.2008)Amended Claims
1. A wireless communication unit (100) comprising a receiver for receiving a wireless signal having signal-to-noise ratio (SNR) measurement logic (112) for measuring a SNR value of the received signal and signal processing logic (108) arranged to process the received wireless signal wherein the signal processing logic comprises demodulator logic (255) for demodulating the received wireless signal operably coupled to log likelihood ratio (LLR) logic (262) for performing a LLR calculation and decoding logic (265) for decoding the demodulated received wireless signal, wherein the LLR logic is operable to apply a scaling factor (Q) in an LLR calculation that is dependent upon the SNR to obtain a scaled LLR value, to apply a limit to the range of the scaled LLR values to be used for quantising to produce a corresponding binary digital value, and to replace an LLR value falling outside the limited range of scaled LLR values with a nearest scaled LLR value within the limited range and to use the nearest scaled LLR value obtained to produce a corresponding binary digital value.
2. The wireless communication unit (100) according to Claim 1 further characterised by a memory element (116) arranged to store a plurality of scaling factors (Q) applied to the LLR logic (262) for different SNR values.
3. The wireless communication unit (100) according to Claim 2 further characterised in that the memory element (116) is arranged to store a plurality of simulated values of scaling factors (Q) applied to the LLR logic (262) for respective SNR values .
4. The wireless communication unit (100) according to Claim 1 wherein the communication unit includes a decoder operable to receive an output signal from the LLR logic and the LLR logic is operable to apply a limit to the range of output LLR values that is predetermined by a number of bits used for an LLR field of the error rate decoder.
5. The wireless communication unit (100) according to Claim 2 wherein the LLR logic (262) interpolates between measured SNR values to obtain the scaling factor (Q) .
6. The wireless communication unit (100) according to Claim 1 further characterised in that the wireless communication unit is capable of operating in a TETRA communication system (100) .
7. A method for receiving a signal in a wireless communication unit (300) comprising the steps of: receiving a wireless signal; measuring a signal-to-noise ratio (SNR) value of the received wireless signal; demodulating the received wireless signal; applying log likelihood ratio (LLR) calculation on the demodulated signal; applying (355) a scaling factor (Q) to the log likelihood ratio (LLR) calculation dependent upon the measured signal-to- noise ratio; and applying a limit to the range of output scaled LLR values to be calculated and to be used for producing a corresponding binary digital value.
8. The method of Claim 7 further characterised by the step of: interpolating between measured SNR values to identify the scaling factor (Q) to be applied to the LLR calculation.
PCT/US2007/061501 2006-02-03 2007-02-02 Wireless communication unit and method for receiving a wireless signal WO2007092744A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07763525A EP1985026A4 (en) 2006-02-03 2007-02-02 Wireless communication unit and method for receiving a wireless signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0602195A GB2434948B (en) 2006-02-03 2006-02-03 Wireless communication unit and method for receiving a wireless signal
GB0602195.0 2006-02-03

Publications (3)

Publication Number Publication Date
WO2007092744A2 WO2007092744A2 (en) 2007-08-16
WO2007092744A3 WO2007092744A3 (en) 2008-06-19
WO2007092744B1 true WO2007092744B1 (en) 2008-08-21

Family

ID=36100992

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/061501 WO2007092744A2 (en) 2006-02-03 2007-02-02 Wireless communication unit and method for receiving a wireless signal

Country Status (3)

Country Link
EP (1) EP1985026A4 (en)
GB (1) GB2434948B (en)
WO (1) WO2007092744A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7876846B2 (en) * 2007-03-28 2011-01-25 Aspen Acquisition Corporation Method of QAM soft demapping
US7551106B1 (en) 2007-12-18 2009-06-23 Telefonaktiebolaget Lm Ericsson (Publ) Adjusting soft values to reduce bias
WO2009086080A2 (en) * 2007-12-21 2009-07-09 Qualcomm Incorporated Scaling and clipping of a digital received signal according to the modulation format of the measured c/ i
US8073076B2 (en) 2007-12-21 2011-12-06 Qualcomm Incorporated Method and apparatus for processing a communication signal
EP2088725B1 (en) 2008-02-11 2014-05-07 Telefonaktiebolaget LM Ericsson (publ) Technique for soft bit scaling
US8311143B2 (en) * 2008-03-31 2012-11-13 Qualcomm Incorporated Scaling methods and apparatus using SNR estimate to avoid overflow
US9113364B2 (en) * 2012-08-09 2015-08-18 Microsoft Technology Licensing, Llc Extended access point
US9602236B2 (en) 2013-06-18 2017-03-21 Samsung Electronics Co., Ltd. Computing system with decoding adjustment mechanism and method of operation thereof

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5450453A (en) * 1994-09-28 1995-09-12 Motorola, Inc. Method, apparatus and system for decoding a non-coherently demodulated signal
US6377607B1 (en) * 1999-05-13 2002-04-23 Qualcomm Incorporated System and method for performing accurate demodulation of turbo-encoded signals via pilot assisted coherent demodulation
US7173990B2 (en) * 2001-12-27 2007-02-06 Dsp Group Inc. Joint equalization, soft-demapping and phase error correction in wireless system with receive diversity
US7340013B2 (en) * 2002-10-24 2008-03-04 Agere Systems Inc. Soft sample scaling in a turbo decoder
US6966024B2 (en) * 2002-12-31 2005-11-15 Motorola, Inc. Method and device for adaptive quantization of soft bits
EP1597667A4 (en) * 2003-02-26 2009-01-14 Qualcomm Inc Soft information scaling for iterative decoding
US7376209B2 (en) * 2003-06-06 2008-05-20 Qualcomm Incorporated Method and apparatus for near-optimal scaling of log-likelihood ratio (LLR) computation in turbo decoding for hybrid automatic repeat request (ARQ)
US6986096B2 (en) * 2003-07-29 2006-01-10 Qualcomm, Incorporated Scaling and quantizing soft-decision metrics for decoding
US7813453B2 (en) * 2004-01-21 2010-10-12 Qualcomm Incorporated Data detection for a hierarchical coded data transmission

Also Published As

Publication number Publication date
EP1985026A2 (en) 2008-10-29
EP1985026A4 (en) 2012-12-19
GB2434948B (en) 2008-04-09
WO2007092744A3 (en) 2008-06-19
GB0602195D0 (en) 2006-03-15
GB2434948A (en) 2007-08-08
WO2007092744A2 (en) 2007-08-16

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