基于新迭代策略的IRA码改进译码算法  

An IRA Codes Decoding Algorithm Based on New Iterative Strategy

作　　者：包志祥[1] 吕娜 陈柯帆[1] 

机构地区：[1]空军工程大学信息与导航学院,西安710077

出　　处：《科学技术与工程》2015年第21期159-163,共5页Science Technology and Engineering

基　　金：国家自然科学基金项目(61472443);国家自然科学基金项目(61302153)资助

摘　　要：IRA码的译码通常采用BP译码算法,然而BP译码算法复杂度高,硬件电路实现困难。最小和译码算法虽然降低了运算复杂度和硬件实现难度,但是其牺牲了部分译码性能。五线段近似算法对BP算了做了近似简化,然而其复杂度依然偏高。提出了一种基于五线段近似和最小和的改进译码算法,在降低系统译码复杂度的同时,保持较高的译码性能。仿真结果表明,改进的译码算法在降低了复杂度的情况下,仍能得到较高的译码性能。IRA codes decoding usually adopt BP algorithm. Compared with BP algorithm, Min-Sum decoding al- gorithm sacrifices parts of the decoding performance when reduces computing complexity. Five-line approximation algorithm simplifies BP algorithm, but its complexity is still on the high side. Considering the different convergence speed of IRA code＇ s nodes when decoding, presents an algorithm combined with Five-line approximation algorithm and Min-Sum algorithm, based on the new iterative strategy. The simulation results show that, compared with Five- line approximation algorithm, the improved decoding algorithm can decrease complexity and keep good perform- ance.

关 键 词：重复累计码 置信传播译码算法 五线段近似译码算法 最小和算法 新迭代策略 

分 类 号：TP802[自动化与计算机技术—检测技术与自动化装置]