Nonlinear error modified equalization algorithm in high-order modulation of satellite communication

Aiming at the larger computation and the slower speed of nonlinear error compensation of traditional equalization algorithms, the fast nonlinear error equalization algorithm with amplitude and phase separation was constructed. It combined the feedback equalization to reduce the computational complexity respectively. In order to eliminate nonlinear interference and memory interference, the algorithm utilized the Volterra model to modify the error and it was adapted to update the feedback equalization parameters. The theoretical analysis and simulation compared proposed algorithm and existing conventional equalization algorithms from the bit error rate, convergence speed and computational complexity. The results show that the computational complexity is only equivalent to 14.1%~24.9% of other algorithms and proposed method can cancel the nonlinear interference quickly.