한국통신학회논문지 (The Journal of Korean Institute of Communications and Information Sciences)

  • 제41권5호
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  • Pages.504-511
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  • 2016
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  • 1226-4717(pISSN)
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  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
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MIMO 시스템에서 LDPC 부호 기반의 터보등화 방식 연구

A Study on Turbo Equalization for MIMO Systems Based on LDPC Codes

  • Baek, Chang-Uk (Korea Maritime and Ocean University Dept. of Radio Communication Eng.) ;
  • Jung, Ji-Won (Korea Maritime and Ocean University Dept. of Radio Communication Eng.)
  • 투고 : 2016.02.01
  • 심사 : 2016.05.23
  • 발행 : 2016.05.31
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초록

본 논문은 외부 부호로 DVB-S2 시스템에서 표준으로 제안된 LDPC 부호와 내부 부호로는 시공간 격자 부호를 사용하는 터보등화 방식의 MIMO 시스템을 제안한다. 시공간 격자 부호와 LDPC 복호기를 연접시킨 계층적 시공간 부호기는 duo-binary 터보 복호기와 연접시킨 터보 등화 방식과는 달리 LDPC 복호기의 내부에서만 반복 복호를 시행하여 성능이 저하되는 문제점을 가지고 있다. 이를 해결하기 위해 시공간 격자 부호화 방식을 BCJR 복호기를 적용하여 LDPC 복호기가 전체 반복을 통하여 성능을 향상시키는 방안을 제시하고 시뮬레이션 하였다. 시뮬레이션 결과 본 논문에서 제시하는 효율적인 연접 방식을 이용하면 기존 연판정 기반의 LDPC와 시공간 격자 부호를 연접하는 방식에 비하여 약 0.6 dB의 성능이 향상되었다.

In this paper, MIMO system based on turbo equalization techniques which LDPC codes were outer code and space time trellis codes (STTC) were employed as an inner code are studied. LDPC decoder and STTC decoder are connected through the interleaving and de-interleaving that updates each other's information repeatedly. In conventional turbo equalization of MIMO system, BCJR decoder which decodes STTC coded bits required two-bit wise decoding processing. Therefore duo-binary turbo codes are optimal for MIMO system combined with STTC codes. However a LDPC decoder requires bit unit processing, because LDPC codes can't be applied to these system. Therefore this paper proposed turbo equalization for MIMO system based on LDPC codes combined with STTC codes. By the simulation results, we confirmed performance of proposed turbo equalization model was improved about 0.6dB than that of conventional LDPC codes.

키워드

참고문헌

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피인용 문헌

  1. 완전 차집합군으로부터 설계된 새로운 불규칙 준순환 저밀도 패리티 체크 부호 vol.41, pp.12, 2016, https://doi.org/10.7840/kics.2016.41.12.1745