A Class of Reduced-Complexity Viterbi Detectors for Partial Response Continuous Phase Modulation

摘要: Partial response continuous phase modulation (CPM) gives constant envelope digital schemes with excellent power spectra. Both narrow main lobe and low spectral tails can be achieved. When these signals are detected in an optimum coherent maximum likelihood sequence detector (Viterbi detector), efficient also designed, sometimes at the expense of receiver complexity. This paper describes a general class simple Viterbi detectors reduced complexity compared to case. The key idea is that approximate based on less complex CPM scheme than transmitted scheme. asymptotically reduced-complexity found for variety various reduction factors, specific receivers indexes. A new distance measure introduced performance analysis. Smooth raised cosine pulses analyzed simulated case simplified reception. graceful degradation occurs