相位估计和最大似然判决相结合提高π/4DQPSK译码性能的研究  

Improvement of the Performance of π/4 DQPSK Based on the Combination of Phase Estimation and Maximum Likelihood

作　　者：丁洪涧 金力军[1] 孙锦华[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《电子科技》2006年第2期36-39,共4页Electronic Science and Technology

摘　　要：提出了一种在带有频偏的高斯白噪声信道中改善π/4DQPSK误码性能的方法,该方法联合使用相位估计和最大似然判决,并具有易于实现的特点。仿真结果表明:该算法使得在误比特率为10-3时信噪比有约1dB的性能改善。This paper presents a novel algorithm for improving the bit error rate performance of π/4 DQPSK in the Gaussian white noise channel with frequency offset. This algorithm uses phase estimation and maximum likelihood decision jointly and has the characteristic of simple implementation. Computer simulation results show that the algorithm has a performance improvement of approximately IdB at BER =10^-3.

关 键 词：频偏 相位估计 最大似然 π/4 DQPSK 

分 类 号：TN911.7[电子电信—通信与信息系统]