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针对高斯滤波器与码元间隔乘积极小(BTb≤1/6)的最小高斯频移键控(GMSK)信号解调,研究了基于1比特相位差分、2比特相位差分和基于维特比(Viterbi)检测算法的相位差分的解调方法,给出了不同了BTb下维特比检测的状态转移计算方法,有效的克服了极小BTb参数引入的码间串扰对解调误比特率的影响。仿真结果表明,在BTb=0.15的情况下,采用基于2比特相位差分的维特比检测(截断长度为4Tb)是较好的解调方案。
Aiming at the minimum Gaussian frequency shift keying (GMSK) signal demodulation with a very small product of the Gaussian filter and the symbol interval (BTb≤1 / 6), the demodulation based on 1-bit phase difference, 2-bit phase difference and Viterbi (Viterbi) ) Demodulation method of the phase difference detection algorithm is given, and different state transition calculation methods for the Viterbi detection under the BTb are given, which effectively overcomes the effect of the inter-symbol interference caused by the minimum BTb parameter on the demodulation bit error rate. The simulation results show that the Viterbi detection based on 2-bit phase difference (truncation length of 4Tb) is a better demodulation solution under the condition of BTb = 0.15.