Title :
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
fDate :
3/1/2003 12:00:00 AM
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;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2003.809994
