面向5G的多元LDPC改进译码算法的仿真研究

Simulation Research on Improved Decoding Algorithm Based on Non-binary LDPC for 5G

根据5G移动通信中高速率、低时延、大容量数据传输及多种场景的特点,提出了一种面向5G的基于多元LDPC码的低复杂度译码算法,即混合域Log-FFT-BP(Mixed Log-FFT-BP)译码算法。该算法直接对概率信息求对数,避免求解对数似然比操作,并且在校验节点的更新过程中,采用对中间变量求对数再对校验节点信息求傅里叶逆变换的方式,来进一步降低译码复杂度。从5G信道编码需支持更广泛的码块长度和更多码率的角度进行仿真,结果表明,与传统译码算法相比,改进的Mixed log-FFT-BP算法性能相差不大,约为0.1~0.2dB,且能够降低译码复杂度,更利于硬件平台的实现。

According to the characteristics of high speed,low delay,high capacity data transmission and various scenes in 5G mobile communication,this paper proposed a low complexity decoding algorithm based on Non-binary LDPC codes for 5G,which is called mixed Log-FFT-BP decoding algorithm.The algorithm directly computes the logarithm of the probability information and avoids the operation of computing the log likelihood ratio.In the process of updating the check nodes,the algorithm uses the logarithm of the intermediate variable and the inverse Fourier transform of the check node information to reduce the decoding complexity.The simulation was conducted for 5G channel coding to support a wider range of code block lengths and more code rates.The simulation results show that the performance of the improved mixed log-FFT-BP algorithm has little difference(about 0.1~0.2 dB)compared with the traditional decoding algorithm,which reduces the decoding complexity and is more conducive to the realization of hardware platform.