高阶QAM解映射方法研究与实现  

Design of High Order QAM Demapper

作　　者：王维 WANG Wei(No.8 Institute of China State Shipbuilding Co.,Ltd.,Nanjing Jiangsu 211100,China)

机构地区：[1]中国船舶集团有限公司第八研究院,江苏南京211100

出　　处：《通信技术》2021年第3期563-567,共5页Communications Technology

摘　　要：高阶正交振幅调制(Quadrature Amplitude Modulation,QAM)映射已在现代通信系统中得到了广泛应用。随着QAM阶数的提高,解映射的复杂度也相应增加,并进一步影响到后续的信道译码等环节。因此,改进高阶QAM的映射和解映射方法,通过对映射的特殊排序处理,降低了解映射的复杂度,继而通过信息再处理,使其输出的对数似然比接近理论计算结果,且计算复杂度远低于理论计算。该方法适用于任意阶数的QAM映射方式,且对于不同阶数都具有统一的形式,便于兼容多种QAM制式的复杂系统的硬件实现。High order Quadrature Amplitude Modulation(QAM)mapping has been widely used in modern communication systems.With the increase of QAM order,the complexity of demapping increases correspondingly and further affects the subsequent channel decoding and other links.In this paper,the mapping and demapping method of high-order QAM is improved.Through the special sorting of the mapping,the complexity of understanding the mapping is reduced.Then,through the information re-processing,the output log likelihood ratio is close to the theoretical calculation result,and the calculation complexity is far lower than the theoretical calculation.This method is suitable for QAM mapping of any order,and has a unified form for different orders,which is convenient for hardware implementation of complex systems compatible with multiple QAM systems.

关 键 词：QAM 对数似然比 解映射 5G WIFI 

分 类 号：TN929.5[电子电信—通信与信息系统]