Parameter Measurement of $M$ -Ary PSK Signals With Finite Rate of Innovation
Ning Fu, Jie Cao, Guoxing Huang, Zhiliang Wei, Liyan Qiao · IEEE Transactions on Instrumentation and Measurement · 2019
Measurement of parameters of M -ary phase shift keying (MPSK) signals is significant for radar and communication systems. Traditional parameter measurement methods require very high sampling rates and heavy processing to estimate the key parameters of amplitude, carrier frequency, phases, and discontinuity locations. We propose a multichannel cooperative sampling system using the finite rate of innovation sampling theorem to address this problem. In our two-channel system, the main channel estimates the MPSK amplitude and carrier frequency using a nonlinear process and time-staggered sampling structure, while the cooperative channel determines phases and discontinuity locations with an annihilating filter using the main channel's estimated carrier frequency. Our system enables recovery of these parameters from as few as 2K+6 samples from MPSK signals with K segments. We also present a hardware platform implementing the structure. The simulation and experimental results demonstrate the effectiveness and robustness of the proposed method.