Turbo碼的一種并行譯碼方案及相應(yīng)的并行結(jié)構(gòu)交織器研究
A Parallel Decoding Scheme and Parallel Construction Interleaver Turbo Codes
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摘要: Turbo碼基于MAP算法譯碼的遞推計(jì)算所引入高的譯碼延遲限制了Turbo碼在高速率數(shù)據(jù)傳輸中的應(yīng)用。為了解決這個(gè)問(wèn)題，該文提供了一種降低譯碼延遲的并行譯碼方法。并行處理方案的實(shí)現(xiàn)必須通過(guò)適當(dāng)?shù)慕豢椧员苊鈨蓚€(gè)譯碼器對(duì)外信息讀寫的數(shù)據(jù)沖突。該文在分析了任意無(wú)沖突交織方式可能性的存在之后，給出了設(shè)計(jì)任意地適用于并行處理方案的S隨機(jī)交織器的方法。仿真驗(yàn)證了并行譯碼方案的誤比特性能。
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關(guān)鍵詞:
- Turbo碼;譯碼延遲;并行處理;數(shù)據(jù)沖突;交織器
Abstract: The high latency introduced by the recursive computation in the MAP-based decoding of turbo codes limits the application of turbo codes in the high data rate transmission。In this paper, a parallel decoding scheme for reducing the decoding delay greatly is presented. In this parallel decoding scheme, interleaver (de-interleaver) must be collision-free when the extrinsic information memory is reading(or writing) between the two decoders. An idea of designing an arbitrary S-random interleaver using the collision-free mapping law is presented. Simulation results show that the BER performance of parallel decoding scheme is inferior slightly to that of the conventional scheme. -
Berrou C, Glavieux A, Thitimajshima P. Near Shannon limit error-correcting coding and decoding: Turbo-codes(1). in Proc.ICC93, Geneva, May 1993: 1064.1070.[2]Benedetto S, Montorsi G, Divsalar D, Pollara F. A soft-input soft-output maximum a posterior (MAP) module to decode parallel and serial concatenated codes. JPL TDA Progress Report, 42-127, November 1996.[3]Jaeyoung Kwak, Kwyro Lee. Design of dividable interleaver for parallel decoding in turbo codes[J].Electronics Letters.2002, 38(22):1362-[4]Tarable A, Benedetto S. Mapping interleaving laws to parallel turbo decoder architectures[J].IEEE Communications Letters.2004, 8(3):162- -
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