Optimization of the channel filter in OFDM radio receivers by using genetic algorithms

This paper proposes a novel method for deriving optimized transfer functions for channel filters in OFDM receivers with Zero Intermediate Frequency architectures. A genetic algorithm is employed, based on only three selection criteria that independently control the pass band and the stop band of the filter. Another special feature of this method is that the disruptive effect of the signals from the adjacent bands is analyzed in detail by using a purpose-built OFDM signal generator. This way the mean attenuation in the adjacent band can be maximized effectively. A Matlab implementation of the proposed method is presented, along with a design example.