Turbo码的一种并行译码方案及相应的并行结构交织器研究
A Parallel Decoding Scheme and Parallel Construction Interleaver Turbo Codes
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摘要: Turbo码基于MAP算法译码的递推计算所引入高的译码延迟限制了Turbo码在高速率数据传输中的应用。为了解决这个问题，该文提供了一种降低译码延迟的并行译码方法。并行处理方案的实现必须通过适当的交织以避免两个译码器对外信息读写的数据冲突。该文在分析了任意无冲突交织方式可能性的存在之后，给出了设计任意地适用于并行处理方案的S随机交织器的方法。仿真验证了并行译码方案的误比特性能。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.
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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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