A Novel Low Complexity Clipping Method for OFDM Signals

In this paper, we propose a low complexity clipping method to reduce the peak power of OFDM signals. The proposed clipping method exploits the conventional square clipping, which clips signal according to the amplitude in I/Q-channels separately, to avoid obtaining a real amplitude of each sample which costs relatively high computational complexities. By combining the square clipping and phase rotations of signals, the proposed octagon clipping achieves close clipping performances to the amplitude based normal clipping with a small amount of computations. The proposed method requires 4 comparison operations, one addition, and one subtraction to clip a sample of signal.