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논문KCI 등재

가변부호율 LDPC 부호

(Low-Density Parity-Check Codes with Rate Adaptability)

하정석
에스케이텔레콤 (주) (SKTelecom)|2006.10|Telecommunications Review|제16권 제5호|pp. 823-836

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참고문헌

주제분류전자/정보통신공학

초록

Abstract

Over time varying channels, channel codes must be flexible in terms of their code rate to efficiently adapt to the channel state and provide the required QoS (Quality of Service). Moreover, they must provide strong error correction capability. Low-Density Parity-Check (LDPC) codes are considered as candidates for error-correcting codes in the future generation communitcation systems due to their powerful error-correcting capability and tractable mathematical structure. Thus, rate-adaptable LDPC codes have been subject to extencsice studies in the recent years. In this paper, we survey the existing literature dealing with rate-adaptable LDPC codes in which puncturing and parity-check eqution combininf techniques are used for increasing the code rate, while extending and shortening are utilized for decreasing it. It is desirabl that the range of code rates be as broad as possible. Unfortunately, as the range of code rates gets broader, the performance of LDPC codes tends to deteriorate. To our best knowledge, it is not possible to efficiently cover a broad range of code rates with a single technique. Thus, combinations of the aforemetioned techniques are neede. We show an example of a practical communication system that uses such a combination to procide a very broad range of available code rates.

참고문헌 (15)

  1. "''Punctured convolutional codes of rate", it-25, pp.97~1 100
  2. "''Parity retransmission hybrid ARQ using rate 1", 2 convolutionalcodes on a nonstationary channel, jul.1989, pp.37, 755~765
  3. "Rate-compatible puncturing of low-density parity-check does", it-50, pp.2824~2836 (2004)
  4. "Rate-compatible punctured low-density parity-check codes with short block lengths", 52(2), pp.728~738 (2006)
  5. "Rate-compatible punctured low-density parity-check codes for Ultra Wide Band systems", pp.3856~3860 (2005)
  6. "Multiplerate low-density parity-check codes with constant block length" (2004)
  7. "Multiple rate LDPC codes with constant blocklength with edge variation", unpublished.
  8. "Rate-compatible low density parity check codes for capacity-approaching ARQ scheme in packet data communications", 2002, pp.201~206 (2002)
  9. "Construction of Rate-Compatible LDPC Codes Utilizing Information Shortening and Parity Puncturing", pp.789~795 (2005)
  10. "Rate-compatible low-density parity-checkcodes", pp.152~ (2004)
  11. "On construction of rate-compatible low-density parity-checkcodes", 8(3), pp.159~161 (2004)
  12. "''Design of rate-compatible irregular repeat accumulate codes"
  13. "Regular and Irregular Progressive Edge-Growth Tanner Graphs", it-51, pp.386~398 (2005)
  14. "3GPP R1-061019 Structure LDPC coding with rate matching."
  15. "Design of Efficiently-Encodable Rate-Compatible Irregular LDPC Codes", 16(5) (2006)

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