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为了更好地挖掘 GMSK信号差分解调本身的性能 ,文中给出了 2比特差分相位检测 (DPD)结合软输出维特比算法 (SOVA)的解调方案。定义了等效最小平方欧氏距离 ,虽然它不能得到最大似然序列 ,但仍是一种简单可行的方法且有很好的性能 ,同时给出了简要的求解过程 ,计算结果表明 2比特 DPD可以得到最大的等效最小平方欧氏距离 ,同时仿真结果表明新的解调方案可以得到很好的误比特性能
In order to better exploit the performance of GMSK signal differential demodulation itself, a demodulation scheme of 2-bit differential phase detection (DPD) combined with soft-output Viterbi algorithm (SOVA) is given. The equivalent least square Euclidean distance is defined. Although it can not get the maximum likelihood sequence, it is still a simple and feasible method with good performance. At the same time, a brief solution process is given. The calculation results show that the 2-bit DPD The maximum equivalent least square Euclidean distance can be obtained, and the simulation results show that the new demodulation scheme can obtain good error bit performance