高码率Turbo码的结构及特性
The Structure and Performance of High Rate Turbo-Codes
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摘要: 构成高码率Turbo码有删除法与多维法两种,讨论了删除法构成Turbo码的交织器设计及删除矩阵结 构。通过分析两种方法构成Turbo码的自由码距,得到了它们的误码率限,发现多维法构成的Turbo码在性能上 优于删除法构成的Turbo码,但译码复杂度高、时延大。经比较发现,删除法构成Turbo码能在性能与实现复杂度 上取得较好折衷,是一种理想的高码率Turbo码构成方案。Abstract: There are multi-dimension and punctured methods for constructing Turbo-codes. The interleave design and punctured matrixstructure in constructingTurbo-codeswith the punctured method are discussed. Through the analysis of the free distances and decoding of high rate Turbo-codes constructed by the above two methods, their bit error limits are obtained, fromwhich theTurbo-codes constructed bymulti-dimension method are found to have better performance than those by punctured method, but with more complex decoding and bigger time delay. Comparison shows that with better compromise in performance and implementation complexity, the punctured method is an ideal scheme to construct high rate Turbo-codes.
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Key words:
- coding /
- error code rate /
- Turbo-codes /
- effective free distance
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