Reduced-state Multi-symbol Differential Non-coherent Detector for Multi-h CPM
Zhong Shen · Video Engineering · 2014
To solve the difficulty and complexity of carrier recovery problem of Multi-h CPM,an algorithm of reduced-state multi-symbol differential non-coherent detector for Multi-h CPM is proposed. Non-coherent sequence detection of residual carrier frequency offset amendment is realized through the calculation of multi-symbol differential information branch metric and the inductive reference phase signal. Using per-survivor processing technology,the number of states is reduced by surviving path tentative decision information. Modulation index estimation and synchronization is realized by calculation and searching branch metrics according to possible modulation index sequence. Simulation analysis shows that,compared with coherent maximum likelihood sequence detection,the proposed algorithm can get small performance loss complexity and its implementation complexity is reduced,and when existing residual carrier frequency offset,its detection performance is also robust.