基于IEEE802.16e的LDPC编译码方案设计及实现  

Design and Implementation of LDPC Codec Based on IEEE802.16e

作　　者：刘晓明[1] 彭芳芳[1] 吴皓威[1] 解志强[1] 

机构地区：[1]重庆大学通信工程学院,重庆400030

出　　处：《计算机技术与发展》2009年第5期205-208,共4页Computer Technology and Development

基　　金：国家发改委CNGI2005示范工程项目(CNGI-04-4-2D)

摘　　要：文中提出了基于IEEE802.16e协议的LDPC码编译码器设计方案。在编码方案中,采用线性复杂度编码,设计了部分译码桶式移位器实现其核心部件矩阵向量乘法器,提高了编码速度,降低了逻辑资源占用量。在译码方案中,针对LOG-BP算法中非线性运算较复杂,译码过程中校验节点更新模块信息量大,消耗资源多的问题,提出用CORDIC算法实现校验节点更新模块,较之传统的LUT方法,节省了大量硬件资源。实验结果表明,本方案在保证LDPC编译码速度和性能的前提下,节约了硬件资源。Brings forward a design scheme of LDPC codes cosec based on IEEE802.16e protocol. Linear time encoding method is used in the encoding scheme, and a partial decoding me, de barrel shifter is designed for the kernel component - MVM. It improves the encoding speed and reduces the quantity of logic resources. In the decoding scheme, huge consuming resource occurs because of the non- linear algorithm＇s complexity in LOG- BP algorithm and large information quantity of check node update unit during decoding process. To solve the problem, suggest using, CORDIC algorithm to implement check node update unit which also saves a lot of hardware resources compared with conventional LUT approach. The experiment results show that this scheme ,saves lots of hardware resources on the premise of satisfying LDPC, codec speed and performance.

关 键 词：LDPC码 编码器 部分译码桶式移位器 译码器 CORDIC 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]