Log-Likelihood Ratios for LDPC Codes with Pilot-Symbol-Assisted BPSK Transmission over Flat Rayleigh Fading Channels

Author

Yuan, Haifeng ; Kam, Pooi Yuen

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore

fYear

2009

fDate

20-23 Sept. 2009

Firstpage

1

Lastpage

5

Abstract

We derive the exact log-likelihood ratio (LLR) for iterative decoding of low-density parity-check codes for pilot-symbol-assisted BPSK transmission over flat Rayleigh fading channels. The bit-error rate (BER) performances of this metric are studied for various interleavers and different pilot spacings. We further compare this metric with the approximate metric, which has been commonly used in the literature. Simulation results show that the newly derived LLR metric results in better BER performances. In addition, the effect of signal-to-noise ratio estimation error is investigated and our new LLR shows more robustness.

Keywords

Rayleigh channels; error statistics; iterative decoding; parity check codes; phase shift keying; BER performance; LDPC codes; binary phase shift keying; bit error rate; flat Rayleigh fading channels; iterative decoding; log-likelihood ratios; low density parity check codes; pilot-symbol-assisted BPSK transmission; signal-to-noise ratio estimation error; AWGN; Binary phase shift keying; Bit error rate; Channel estimation; Fading; Iterative algorithms; Iterative decoding; Maximum likelihood decoding; Parity check codes; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference Fall (VTC 2009-Fall), 2009 IEEE 70th

Conference_Location

Anchorage, AK

ISSN

1090-3038

Print_ISBN

978-1-4244-2514-3

Electronic_ISBN

1090-3038

Type

conf

DOI

10.1109/VETECF.2009.5378688

Filename

5378688