Multi-branch Continuous Phase Modulation and Demodulation Method Based on PSWFs Signal

doi:10.3969/j.issn.1000-1093.2021.07.010

Abstract

Abstract: A multi-branch continuous phase modulation and demodulation method based on prolate spheroidal wave functions (PSWFs) signal is studied for the problems of low communication rate and low spectral efficiency in the existing very low frequency (VLF) communication mode. Through introducing the PSWFs signal with high energy aggregation in the time-frequency domain into continuous phase modulation and using the complete orthogonal characteristics of the PSWFs signal, the PSWFs signal with different orders are simultaneously used as the continuous-phase modulated baseband frequency-modulated pulse signals, thereby generating a modulated signal. At the signal receiving end, the traditional differential coherent detection method is used to demodulate the mapping information of information symbol sequence. And then the method of obtaining the sum of cross-correlation values of the signals during multiple bit periods is used to detect and demodulate the PSWFs waveform mapping information. The experimental results show that, compared with the minimum frequency shift keying modulation mode currently used in VLF underwater communication, the spectral efficiency can be effectively improved by about 9.43%, but it can be reduced by about 1.24% under the condition of 99.0% power bandwidth of modulated signal.

Key words: prolatespheroidalwave, multi-branchcontinuousphasemodulation, modulationanddemodulationmethod, spectralefficiency

CLC Number:

TN911.3

YANG Dawei， LIU Chuanhui， ZHANG Lei， KANG Jiafang. Multi-branch Continuous Phase Modulation and Demodulation Method Based on PSWFs Signal[J]. Acta Armamentarii, 2021, 42(7): 1431-1439.

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