邻频干扰对跳频GMSK接收机的性能影响分析

在考虑跳频系统中系统用户数、可用频点数、信道参数和环境噪声因素的条件下,重点研究邻频干扰(ACI)对跳频系统典型GMSK接收机误码率(BER)性能的影响。研究了GMSK非相干平方律接收结构和包络检波接收结构,通过分析接收信号经过各接收单元的变化,得出判决信号的解析表达式;通过分析判决信号的概率密度函数和特征函数,推导得出跳频系统在ACI影响下的系统BER公式。仿真结果表明,该理论能够评估ACI对跳频系统典型GMSK接收机的BER性能影响。

Performance Analysis of GMSK Receiver in Frequency-Hopping System With Adjacent-channel Interference

Taking the Gaussian-Minimum-Shift-Keying (GMSK)receiver in Frequency-Hopping (HF) system as the research object,the Bit-Error-Rate (BER) performance of the typical GMSK receiver in HF system with Adjacent-Channel Interference (ACI) is focused on,considering the available frequency points, station number, channel parameters and noise. From the structure of square-law receiver and envelope-detection receiver of non-coherent GMSK demodulation, the expressions of the decision signal is obtained,by analyzing the received signal after the receiving unit. The BER formula of the frequency hopping system with ACI is derived, through analyzing the Probability Density Function (PDF) and the Moment Generating Function (MGF) of the decision signal. Through theoretical calculation and simulation,the BER performance of the typical GMSK receivers in HF system with ACI is evaluated.