Abstract:

A multistage soft decision equalizer based on minimum bit error rate is proposed for interference suppression in communications. Bit error rate and computational complexity can be compromised by controlling rejection threshold of each stage. Simulation results show that when extended binary phase shifting keying signals are contaminated by the mix of relatively strong interference signals of amplitude modulation and frequency modulation, multistage soft decision equalizers based on minimum bit error rate can provide very low bit error rate, and the computational complexity is greatly reduced. Furthermore, it is found that by combining different nonlinear equalizers, performance superior to single equalizers can be obtained.

Key words:

nonlinear equalizers, multistage soft decision equalizers, minimum bit error rate, interference suppression