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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Error Correction by Redundant Bits in Constant Amplitude Multi-code CDMA

  • 송희근 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 김성만 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 김범곤 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 김동석 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 고대원 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 김용철 (서울시립대학교 전자전기컴퓨터공학부)
  • Published : 2006.11.30
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Abstract

In this paper, we present two methods of correcting bit errors in constant amplitude multi-code (CAMC) CDMA, which uses the redundant bits only. The first method is a parity-based bit correction with hard-decision, where the received signals despread into n two-dimensional structure with both horizontal parity and vertical parity. Then, an erroneous bit is corrected for each $4{\times}4$ pattern. The second method is a turbo decoding, which is modified from the decoding of a single parity check product code (SPCPC). Experimental results show that, in the second method, the redundant bits in CAMC can be fully used for the error correction and so they are not really a loss of channel bandwidth. Hence, CAMC provides both a low peak-to-average power ratio and robustness to bit errors.

Keywords

References

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