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为了解决连续相位调制(CPM)信号在某些突发传输条件下或信道快速变化情况下的解调难题,研究了基于多符号差分相关的非相干维特比(Viterbi)解调算法。从理论上分析算法在CPM调制解调系统中的应用、性能和可实现性,并以高进制、低调制指数的CPM信号为例,通过数值仿真验证了理论结果。在CPM非相干解调中考虑多符号差分相关,能够将复杂理论向实际应用简化,以最小的性能代价换取系统复杂度的降低和解调速度的提高,易于在各种硬件平台上以软件无线电格式实现,有一定的理论和实用价值。
In order to solve the demodulation problem of continuous phase modulation (CPM) signal under some burst transmission conditions or fast channel changes, a non-coherent Viterbi demodulation algorithm based on multi-symbol differential correlation is studied. The application, performance and feasibility of the algorithm in CPM modem system are theoretically analyzed. The CPM signal of high modulation and low modulation index is taken as an example to verify the theoretical results through numerical simulation. Considering multi-symbol differential correlation in CPM non-coherent demodulation, it can simplify complex theory to practical application and reduce system complexity and demodulation speed with minimum performance cost. It is easy to use software radio on various hardware platforms, Format to achieve a certain degree of theoretical and practical value.