摘要
The demand for wireless spectrum and data transmission has increased dramatically with the rapid growth of deepspace exploration and communication.The satellite relay communication is an essential technique to solve the issues above.The method of combining Physical-layer Network Coding(PNC)with Continuous Phase Modulation(CPM)on relay satellites can improve communication efficiency and perform the collection and transmission of space data effectively.Partial-Response CPM(PR-CPM)signals possess excellent spectrum and power characteristics and are suitable for deep-space communications with limited bandwidth and massive data transmission.In this paper,a partial response non-coherent multi-symbol detection algorithm is proposed based on the Maximum-Likelihood principle.The proposed algorithm fully utilizes the memory properties of PR-CPM signals and makes decisions on specified symbols by observing a number of symbols each time.Simulation results indicate that the performance gain under the Bit Error Rate of 10-4 is about 2 dB when 5 symbols are inspected,compared with the case where the observation length is 3.
基金
supported in part by the Natural Science Foundation of China under Grant 61971221,61971220
the Six Talent Peaks Project in Jiangsu Province
in part by the Fundamental Research Funds for the Central Universities of China Grant NP2020104
in part by the Graduate Innovation Open Foundation of Nanjing University of Aeronautics and Astronautics under Grant kfjj20190416。
