Turbo-decoding without SNR estimation

Author

Worm, Alexander ; Hoeher, Peter ; Wehn, Norbert

Author_Institution

Inst. of Microelectron. Systems, Kaiserslautern Univ., Germany

Volume

4

Issue

6

fYear

2000

fDate

6/1/2000 12:00:00 AM

Firstpage

193

Lastpage

195

Abstract

Theoretically, it is necessary to estimate the SNR when using a MAP of the log-MAP constituent decoder. The effect of an SNR mismatch on the bit error rate performance of turbo-codes and the design of good variance estimators have been addressed by several authors. In this letter we study the SNR sensitivity of turbo-decoding with log-MAP and max-log-MAP constituent decoders respectively for AWGN and Rayleigh fading channels. Our theoretical and simulation results indicate that an estimation of the SNR is not necessary from a practical point of view. Our setup is aligned with decoder implementation aspects of future mobile communication systems.

Keywords

AWGN channels; Rayleigh channels; convolutional codes; error statistics; mobile radio; turbo codes; AWGN channel; BER; Rayleigh fading channel; SNR estimation; SNR sensitivity; bit error rate performance; convolutional codes; log-MAP decoder; max-log-MAP decoder; mobile communication systems; simulation results; turbo-codes; turbo-decoding; variance estimators; AWGN; Amplitude estimation; Bit error rate; Convolutional codes; Decoding; Fading; Mobile communication; Proposals; Signal to noise ratio; Turbo codes;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/4234.848410

Filename

848410