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非协同突发信号的检测与解调
魏宇培,梁先明,廖龙灵
0
(中国西南电子技术研究所,成都 610036)
摘要:
根据典型的海事三代卫星通信帧格式,首先采用能量检测算法结合匹配滤波法进行有效的突发信号的检测,然后根据信号检测的结果进行了突发信号的频率估计和初相估计,再采用初相注入结合锁相环的方式实现突发信号的解调。理论推导和计算仿真表明,该方法能够适应较低信噪比、较大频偏和起伏动态的影响,当信噪比大于10 dB时,信号检测概率基本达到100%,解调误码率低于2×10-3。
关键词:  卫星通信;非协同通信;突发信号检测  匹配滤波法  初相估计
DOI:
基金项目:
Detection and demodulation of burst signal for non-cooperative communication
WEI Yupei,LIANG Xianming,LIAO Longling
()
Abstract:
According to the waveform protocol and frame structure of the Third Generation Maritime Satellite Communication,energy detection is combined with matching filter to realize burst signal detection,then frequency estimation and phase estimation is performed according to the result of signals detection.And then signal demodulation is realized through combining initialization phase estimation with phase locked loop(PLL). Both theoretical deduction and simulation indicate the method adapts to lower signal-to-noise ratio(SNR), higher frequency offset and bigger dynamic range.Signal detection probability approaches to 100 percent,and the demodulation bit error rate(BER) is under 2×10-3 when the Eb/N0 is above 10 dB.
Key words:  satellite communication  non-cooperative communication  burst signal detection  matching filter method  initial phase estimation