Variable Momentum Constant Modulus Algorithm for Blind Equalization of CPFSK Signals
Mingxin Zhang, Xihai Xie, Cheng Yu Huang, S. Na · 2023
In order to improve the convergence speed of the constant modulus algorithm (CMA) for continuous phase frequency shift keying (CPFSK) signal blind equalization under certain steady-state error conditions, a variable momentum CMA (VMCMA) for blind equalization of CPFSK signals is proposed in this paper. The momentum CMA (MCMA) for blind equalization of CPFSK signals is obtained by introducing the momentum algorithm and adding the momentum term in the update iteration process to improve the convergence speed of the blind equalization algorithm. The effect of the momentum factor on the convergence performance of the algorithm is investigated, and the momentum term is improved by introducing a variation factor to reduce the steady-state error after convergence of the MCMA, which leads to a VMCMA for blind equalization of CPFSK signals. The proposed VMCMA for blind equalization of CPFSK signals is experimentally compared with the CMA. Simulation results show that the VMCMA converges to the steady state faster than the CMA under the condition that the steady-state error after convergence of the algorithm is similar to that of the CMA.