A simplified bit metric calculation method for high-order PSK

作     者：WANG Lei XU DaZhuan ZHANG XiaoFei 

作者机构：College of Information Science and Technology Nanjing University of Aeronautics and Astronautics 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2013年第56卷第7期

页      面：109-117页

核心收录：

学科分类：11[军事学] 0810[工学-信息与通信工程] 1105[军事学-军队指挥学] 08[工学] 081002[工学-信号与信息处理] 110503[军事学-军事通信学] 

主　　题：phase shift keying high order modulation bit metric soft demodulation 

摘      要：This paper proposes a simplified bit metric calculation method for high-order PSK signal with Gray-mapping. This method calculates the bit metric recursively by the symmetry of Gray code. Analysis and simulation results show that the proposed method can significantly reduce the computational complexity and maintain similar performance compared to ML and Max-Log bit metric. Additionally, this method generates bit metrics of PSK signals with different modulation order in the same way, so it can be applied to adaptive modulation system.