Log-likelihood ratio (LLR) conversion schemes in orthogonal code hopping multiplexing

Author

Kwon, Jae Kyun ; Park, Suwon ; Sung, Dan Keun

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea

Volume

7

Issue

3

fYear

2003

fDate

3/1/2003 12:00:00 AM

Firstpage

104

Lastpage

106

Abstract

Log-likelihood ratio (LLR) conversion schemes are proposed to reduce the effect of perforations that occur in orthogonal code hopping multiplexing (OCHM), which was previously proposed to accommodate more downlink channels than the number of orthogonal codewords. The proposed LLR conversion schemes greatly reduce the required signal-to-noise ratio (SNR) in channel decoding even when the perforation probability is high. The performance of the proposed schemes is evaluated by simulation in terms of the required E/sub b//N/sub 0/ for a 1% block error rate.

Keywords

AWGN channels; channel coding; decoding; land mobile radio; multiplexing; radio links; LLR conversion; SNR; block error rate; channel decoding; downlink channels; log-likelihood ratio conversion; mobile communications; orthogonal code hopping multiplexing; orthogonal codewords; orthogonal downlink; perforation probability; signal-to-noise ratio; simulation; statistical multiplexing; AWGN channels; Decoding; Degradation; Demodulation; Downlink; Error analysis; Mobile communication; OFDM; Signal to noise ratio; Traffic control;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2003.809994

Filename

1187371