Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Receiver design using LDPC codes for ISI+AWGN channel

ISI+AWGN 채널에 적합한 LDPC 부호를 이용한 수신 시스템 설계

  • Hong, Jin-Seok (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Chung, Bi-Woong (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Kim, Joon-Sung (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Song, Hong-Yeop (Department of Electrical and Electronic Engineering, Yonsei University)
  • 홍진석 (연세대학교 공과대학 전자공학과) ;
  • 정비웅 (연세대학교 공과대학 전자공학과) ;
  • 김준성 (연세대학교 공과대학 전자공학과) ;
  • 송홍엽 (연세대학교 공과대학 전자공학과)
  • Published : 2005.11.26
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Abstract

In this paper, we propose a receiver that combines a channel detector with a channel decoder to retrieve information from ISI and AWGN in an iteratively manner. The receiver, evolving from a system of a PRML detector and a RS decoder, consists of a SOVA detector followed by a LDPC decoder and has them exchange information iteratively. Rather than handling extrinsic reliabilities explicitly as in Turbo equalization, we take hard-decision values from the LDPC decoder and mix them with the channel output in a certain ratio as input for SOVA. The scheme, simply modified to the one-way structure of a SOVA and a LDPC decoder, shows improved performance with iteration numbers as well as the combining ratio of the channel output and the feedback output. We additionally analyze the receiver with a simple theoretical model and present some valuable properties.

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