一种适用于BICM-ID系统的8APSK映射方案  

A Constellation Mapping Scheme of 8APSK Modulation for BICM-ID Systems

作　　者：焦琦 付芳 张志才 JIAO Qi;FU Fang;ZHANG Zhicai(College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学物理电子工程学院

出　　处：《山西大学学报（自然科学版）》2019年第3期548-553,共6页Journal of Shanxi University(Natural Science Edition)

摘　　要：为了提高频谱效率和编码增益,基于欧氏距离设计准则提出了一种(3,5)-8APSK映射方案。新映射方案根据最小欧氏距离最大化准则确立最优的半径比,通过计算机搜索的方式确定最优的映射分布,并将其应用于联合低密度奇偶校验(LDPC)码的比特交织编码调制迭代译码(BICM-ID)系统中。基于MATLAB搭建LDPCBICM-ID系统,误比特率仿真表明,使用IEEE 802.16e标准的码长2 304,码率5/6的LDPC码,在目标BER为10-5时,(3,5)-8APSK映射方案较(2,6)-8APSK映射方案、8PSK的格雷(Gray)映射、集分割(SP)映射、半集分割映射(SSP)分别提高了约1.1dB、0.45dB、1.3dB、1.8dB的增益。信道容量仿真表明,(3,5)-8APSK映射方案在中高信噪比区域相比其余4种映射方案性能表现优异。外部信息转移图仿真表明,(3,5)-8APSK映射方案较其余4种映射方案能更早地打开译码通道,完成无错译码。In order to improve spectral efficiency and coded gain,a(3,5)-8 APSK mapping scheme is proposed based on the Euclidean distance design criterion.The new mapping scheme establishes an optimal radius ratio based on maximizing the minimum Euclidean distance criterion and determines the optimal mapping distribution by computer search.The new mapping scheme is applied to the bit-interleaved coded modulation iterative decoding(BICM-ID)system of joint Low-Density Parity Check(LDPC)codes.A LDPC-BICM-ID system is built to simulate based MATLAB.The bit error rate simulation results show that,when a LDPC code with code length 2 304,code rate 5/6 according IEEE 802.16 estandard is used,the(3,5)-8 APSK mapping scheme has improved 1.1 dB,0.45 dB,1.3 dB,1.8 dB gain than(2,6)-8 APSK mapping scheme,and Gray,Set Partition(SP),Semi Set Partition(SSP)mapping of 8 PSK respectively.The channel capacity simulation shows that the(3,5)-8 APSK mapping scheme performs better than the other four mapping schemes in the medium-high signal-to-noise ratio region.Extrinsic Information Transfer chart simulation shows that the(3,5)-8 APSK mapping scheme is the earliest among these schemes to open decoding channel,and completes error-free decoding.

关 键 词：8APSK星座映射 比特交织编码调制迭代译码 LDPC码 EXIT图 编码增益 

分 类 号：O436[机械工程—光学工程]