Turbo decoding for wireless systems with imperfect channel estimates

Author

Frenger, Pål

Author_Institution

Ericsson Radio Syst. AB, Stockholm, Sweden

Volume

48

Issue

9

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

1437

Lastpage

1440

Abstract

A new metric for turbo decoding on Rayleigh fading channels with noisy channel estimates is derived. By including the error variance of the channel estimate in the decoder metric derivation, we calculate the correct channel reliability factor for this case. Simulations show that the signal-to-noise ratio gain of using this new metric, compared to ignoring the uncertainty of the channel estimate, may be as large as 1 dB at a bit error probability of 10^-3. This gain is obtained without any complexity increase

Keywords

Rayleigh channels; channel coding; decoding; error statistics; estimation theory; modulation coding; phase shift keying; telecommunication network reliability; Rayleigh fading channels; bit error probability; channel reliability factor; complexity; decoder metric derivation; error variance; imperfect channel estimate; noisy channel estimates; signal-to-noise ratio gain; turbo decoding; wireless systems; AWGN channels; Additive white noise; Decoding; Error correction; Fading; Gaussian noise; Rayleigh channels; Signal to noise ratio; Turbo codes; Uncertainty;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.870005

Filename

870005