一种高资源效率的Fast-RCSC极化码译码器

High Resource Efficiency Fast-RCSC Polar Decoder

摘要:

针对现有极化码软输出译码器存在的高资源消耗与低资源效率问题,设计了一种Fast-RCSC译码算法及其译码器硬件架构。Fast-RCSC算法对内部特殊结点进行完整计算,在减少译码周期的同时仍有较好译码性能。基于不同特殊结点公式之间存在相似性,进而通过对引入的特殊结点模块进行计算结果复用以及计算模块分时复用,减少特殊结点模块资源消耗。通过共用存储单元以及对不足存储单元数据宽度的数据进行合并,降低存储资源消耗。在CSMC 180nm工艺下综合结果表明,设计的译码器在码长为1024的情况下,面积大小为2.92mm2,资源效率为245.2Mbps/mm2,对比现有软输出译码器有不同程度的提升。

Abstract:

A Fast-RCSC decoding algorithm and its hardware architecture are design to solve the high-resource and low-resource-efficiency problems of soft output decoders. By designing a Fast-RCSC algorithm, the internal special nodes are completely calculated, and the decoding performance is still good while reducing the decoding cycle.Because the calculation formulas of different types of special nodes are similar, multiplexing the calculation results of the special node module and using calculation module in different time are used.The consumption of special node modules can be reduced while reducing the decoding cycle. By sharing storage units and merging datas that is less than the data width of the storage unit, the consumption of storage resources required for decoding is reduced. The synthesis results in the CSMC 180nm process show that the designed decoder has an area of 2.92 mm2 and a resource efficiency of 245.2Mbps/mm2 when the code length is 1024.