Abstract:

Aiming at the enviroment of non-cooperative satellite communications, a blind parameter estimation method is presented. By utilizing power spectrum symmetry of linear modulation signals and its relationship with shaping filters, the spectrum envelope is extracted based on curve fitting. Then basic signal parameters, such as carrier frequency and band width (BW), are blindly estimated. It is confirmed by computer simulation results that the algorithm is effective for conventional satellite communication signals at low signal-to-noise ratio (SNR), such as MPSK and MQAM. The proposed algorithm is also easy to implement with low computation complexity.

Key words: blind parameter estimation, curve fitting, satellite communication signal