一种低码率的LDPC码在LTE-A中的性能研究

本文通过分析LTE-Advanced系统中准循环LDPC码校验矩阵的构造方法,在不改变母码矩阵的基础上,采用一种灵活的扩展方法,构造了一种低码率的LDPC码。采用一种很实用的编码算法和差分译码算法,在MATLAB仿真平台下,比较了这种LDPC码和Turbo码的性能。结果表明：在短码情况下,这种LDPC码在低信噪比下性能略低于Turbo码,但随着信噪比的增加,LDPC码性能优于Turbo码;在长码情况下,LDPC码的性能明显优于Turbo码。为LTE-Advanced系统的信道编解码器的硬件设计提供了一套有效的编译码算法方案,具有较好的实用价值。

Performance research on a low rate of LDPC codes in LTE-advanced

By analyzing the basal construct rule of LDPC Code check matrix in LTE-Advanced system, adopt to a flexible extension method to construct a low rate of LDPC codes, for the matrix does not change the master code. Then, this paper put to use a very practical coding algorithms and differential decoding algorithm, compared the performance of the LDPC code and Turbo code in MATLAB simulation platform. The results showed that： In the case of short codes, the performance of LDPC was slightly lower than Turbo codes under low SNR. But as the SNR increases, LDPC code is superior to Turbo codes; In the case of long codes, the performance of LDPC codes is obvious better than Turbo codes. This paper provides an effective coding and decoding algorithm scheme for hardware design in LTE-Advanced, having some practical value.