Reduced-state noncoherent MLSD method for CPM in aeronautical telemetry  

作　　者：Zhou You Duan Ruifeng Jiang Bofeng 

机构地区：[1]School of Electoric and Information Engineering,Beihang University,Beijing 100191,China [2]School of Information Science and Technology,Beijing Forestry University,Beijing 100083,China [3]Beijing Xinwei Technology Group.Co.,Ltd,Beijing 100193,China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2020年第4期43-53,共11页中国邮电高校学报（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities ( BLX201623 );the National Natural Science Foundation of China ( 31700479)。

摘　　要：Due to high spectral efficiency and power efficiency, the continuous phase modulation(CPM) technique with constant envelop is widely used in range telemetry. How to improve the bit error rate(BER) performance of CPM and keep a reasonable computational complexity is the key of the entire telemetry system and the focus of research and engineering design. In this paper, a reduced-state noncoherent maximum likelihood sequence detection(MLSD) method for CPM is proposed. In the proposed method, the criterion of noncoherent MLSD is derived for CPM when the carrier phase is unknown. A novel Viterbi algorithm(VA) with modified state vector is designed to simplify the implementation of noncoherent MLSD. Both analysis and numerical results show that the proposed method reduces the computational complexity significantly and does not need accurate carrier phase recovery, which overcomes the shortage of traditional MLSD method. Additionally, the proposed method exceeds the traditional MLSD method when carrier phase deviation exists.

关 键 词：CPM LOW-COMPLEXITY noncoherent detection MLSD Viterbi algorithm 

分 类 号：TN911.3[电子电信—通信与信息系统] V217[电子电信—信息与通信工程]