基于IEEE 802.16e标准的与CRC结合的LDPC编译码算法研究

Research on LDPC Coding and Decoding Algorithm with CRC Checking Based on IEEE 802.16e

低密度奇偶校验(LDPC)码是一种具有超强的纠错性能和极低的解码复杂度的前向纠错码,并且在通信领域正得到越来越多的关注,其中基于IEEE 802.16e标准的LDPC码是通过基于基本矩阵循环移位得到的一种结构性的LDPC码,这种特性使得其编码器和译码器的设计都相对简单,可以有更高的并行度和译码吞吐量。在IEEE 802.16e标准的LDPC码的基础上结合CRC进行编译码,使得其可靠度有所提高。实验仿真结果表明结合CRC的LDPC编译码算法在相同的信噪比下具有更低的误码率,可靠性和准确性得以提升。

Low density parity check(LDPC)code is a forward error correction code with super error correction performance and very low decoding complexity,and it is getting more and more attention in the field of communication.The LDPC code based on the IEEE 802.16e is a structured LDPC code obtained by cyclic shifting based on the basic matrix.This feature makes the design of the codec relatively simple and has higher parallelism and throughput.Adding CRC checking during LDPC encoding and decoding process can improve the reliability of Codec.The experimental simulation results show that the LDPC codec algorithm which combined with CRC has lower bit error rate on the same signal-to-noise ratio,and the reliability and accuracy are improved.