Initial LLR setting for belief propagation decoding in relay system

Naohiro Tsuji, Tomoaki Ohtsuki

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

Relay transmission can enhance a communication reliability, increase a transmission rate and save power at a sending station in wireless networks. The scenario under consideration is a simple relay system that sending station sends coded data to a receiving station through a relay station. The relay station makes hard decision and transmits it. The receiving station decodes the error-correcting-coded bits using loglikelihood ratio (LLR). Here, it is important to set initial LLR to decode the coded data accurately at the receiving station. In this paper, we present how to set initial LLR for belief propagation decoding in the relay system to achieve better decoding error rate performances. We calculate initial LLR based not only on the channel from the relay station to the receiving station, but also on the channel from the sending station to the relay station when the station decodes error-correcting coded data. When we use turbo code or low-density parity-check (LDPC) code as error-correcting code, we decode the coded data accurately by the use of accurate initial LLR. Through computer simulation, we showed that the proposed method achieves better error rate performances compared to the conventional method both when the channel estimation is perfect and when the channels are estimated. Moreover, we showed that the average number of decoding iterations of the proposed method decreases compared to those of the conventional method.

本文言語English
ホスト出版物のタイトル2010 IEEE International Conference on Communications, ICC 2010
DOI
出版ステータスPublished - 2010 8 13
イベント2010 IEEE International Conference on Communications, ICC 2010 - Cape Town, South Africa
継続期間: 2010 5 232010 5 27

出版物シリーズ

名前IEEE International Conference on Communications
ISSN(印刷版)0536-1486

Other

Other2010 IEEE International Conference on Communications, ICC 2010
国/地域South Africa
CityCape Town
Period10/5/2310/5/27

ASJC Scopus subject areas

  • コンピュータ ネットワークおよび通信
  • 電子工学および電気工学

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