关键词: 恒模算法 盲均衡 物理级建模 仿真

Abstract:

By studying the characteristics of the constant modulus blind equalization algorithm（CMA）, this paper presents a method of modeling CMA based on Sim   ulink. This method avoids using a complex programming language to implement the algorithm, but adopts a visual modeling method based on the physical lay er. In order to verify its validity and effectiveness, a BPSK digital communication system is established. Simulation and analysis is performed on the e qualization performance of the model based on the platform of digital communication, and a comparison is made between LMS, RLS,and CMA. Through the simu   lation, this paper provides the BER performance, constellation map and convergence curve under the condition of three different algorithms. Simulation results show that the model is correct, has good performance to equalize time-varying channels and needs no signal transcendental information. By comparing with the non-blind equalizer based on LMS and RLS, this paper also demonstrates that the convergence of CMA is slower,and BER is higher.

Key words: constant modulus algorithm, blind equalization, physical layer modeling, simulation