Blind Demodulator Design and Simulation of CPM-signal in Non-cooperative Communication
A blind demodulator structure of CPM-signal in non-cooperative communication system is proposed.First,the cyclic property of CPM-signal after pretreatment is analyzed and the blind identification of modulation order of CPM-signal is actualized by analyzing the relationship between the modulation order and cyclic-spectrum density.Second,the frequency shaping pulse is estimated blindly using the auto-correlation of CPM-signal.Last,the blind demodulator is actualized using the composite trellis demodulation algorithm.The simulation shows that the demodulator is easy implementation with feed-forward structure.