5G新空口LDPC码的快速编码算法

Fast Encoding Algorithm for 5G New Radio LDPC Code

低密度奇偶校验码(Low Density Parity Code,LDPC)已被用于5G系统,且TS 38.212标准规定了5G新空口(New Radio,NR)LDPC码的构造流程,但没有给出具体的编码算法和解速率匹配方法。针对该问题,首先分析了NR LDPC码的基矩阵的结构特征,给出了线性复杂度的编码算法;其次讨论了速率匹配算法的特点,给出了解速率匹配方法;最后在单用户系统和稀疏码多址接入系统下评估了NR LDPC码的性能。仿真结果表明,NR LDPC码具有优于长期演进(Long Term Evolution,LTE)Turbo码和802.16e LDPC码的纠错性能,因此所提算法是有效的。

LDPC(Low Density Parity Code) is used in the fifth generation mobile communication(5 G)systems. The TS 38.212 standard specifies the construction process of 5 G NR(New Radio) LDPC codes,but doesn’t give specific encoding and de-rate matching algorithms. To deal with this problem, firstly, the characteristics of NR LDPC codes’ base graph is analyzed, and the coding algorithm of linear complexity is given. Then, the characteristics of rate matching algorithm are discussed, and the de-rate-matching method is given. Finally, the performance of NR LDPC code is evaluated in single user system and sparse code multiple access system. Simulation results indicate that the performance of NR LDPC code is better than that of LTE(Long Term Evolution) turbo codes and 802.16 e LDPC codes, so the proposed algorithm is effective.