Turbo decoders which adapt to noise distribution mismatch

Author

Huang, Xiaoling ; Phamdo, Nam

Author_Institution

Dept. of Electr. & Comput. Eng., State Univ. of New York, Stony Brook, NY, USA

Volume

2

Issue

12

fYear

1998

Firstpage

321

Lastpage

323

Abstract

This article investigates the sensitivity of turbo decoder performance to mismatch of the noise distribution, and proposes a simple on-line procedure for estimating the unknown noise distribution from each block of received signal. This procedure consists of: (1) quantization of the received signal and (2) estimation of the noise distribution from the histogram of the quantized received signal. For Gaussian and Laplacian noise, the proposed procedure leads to decoder performances which are comparable (within 0.1 dB at bit-error rate of 10/sup -4/) to the case where the noise distribution is known exactly.

Keywords

AWGN; Gaussian distribution; decoding; error statistics; quantisation (signal); turbo codes; BER; Gaussian distribution; Gaussian noise; Laplacian noise; additive white noise channel; bit-error rate; copy-and-symmetrize method; histogram; noise distribution estimation; noise distribution mismatch; on-line procedure; received signal quantization; turbo codes; turbo decoder performance; AWGN; Additive white noise; Bit error rate; Gaussian distribution; Gaussian noise; Iterative decoding; Laplace equations; Noise robustness; Signal to noise ratio; Turbo codes;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/4234.736172

Filename

736172