新颖的低延迟并行Turbo译码方案

Novel low-delay scheme for parallel Turbo decoding

为了减小MAP类算法因迭代和递推计算引起的译码延迟,提出了一种新的降低延迟的并行译码方案。新方案的关键是设计新型的无冲突(CF,collision-free)交织器,在对CF准则分析之后,利用滑动窗的思想,提出了基于窗的CF交织器设计准则和一种实现方法,新CF交织器可以立即使两级SISO处理器之间传递的外信息作为彼此的先验信息用于下一次分量译码以减小译码延迟。最后仿真验证了新并行译码方案的误比特性能。

In order to decrease decoding delay because of the iterative and recursive computation in MAP class algo- rithms, a novel parallel decoding scheme was proposed. The key of the novel scheme was to design a novel collision-free （CF） interleaver. After the analysis of the CF criterion, the design criterion and an implementation approach of the CF interleaver based on the window were proposed by using the idea of the sliding window. The novel CF interleaver allowed extrinsic information immediately as priori information to start the next component decoding so as to decrease decoding delay. Finally, simulation results show the BER performance of novel parallel decoding scheme.