A Max-Min Approach to Channel Shortening in OFDM Systems

In OFDM systems, residual inter-block interference can be suppressed by a time-domain equalizer that blindly shortens the effective length of a channel impulse response. To further improve the performance of blind equalizers, we propose a channel shortening method that attempts to maximize the minimum FFT output power over data subcarriers. Simulation results indicate that the max-min strategy has performance improvement over a conventional channel shortening method. key words: inter-block interference, carrier nulling algorithm, blind equalization, semi-definite relaxation