Performance of optimal and suboptimal detection for uncoded OFDM system with deliberate clipping and filtering

The performance of optimal detection based on maximum-likelihood criterion is analyzed for the uncoded OFDM system with the deliberate clipping and filtering. Since the maximum-likelihood detector is difficult to implement, a low-complexity suboptimal detection method is also developed for the system. The analysis based on the truncated union bound and simulation results show that one can achieve clipping gain if the system is appropriately designed. Furthermore, the performance improvement due to the frequency diversity effect is also achieved with moderate clipping and suboptimal detection over frequency-selective Rayleigh fading channels, even without any channel coding.