A minimum clipping power loss scheme for mitigating the clipping noise in OFDM

The paper proposes a new method, Minimum Clipping Power Loss Scheme (MCPLS), to control the clipping noise based on the relationship between the power of clipped portion and the clipping noise power of OFDM signals. First, the transmitter generates multi-route signals carry the same information, then estimates the clipping noise power of every route under the same clipping threshold, at last, selects the one with the lowest clipping noise power to clip and transmit. The simulation results prove this method can mitigate clipping noise and improve the performance of system. The Signal-to-Noise Ratio is gained 8dB to achieve 10(-3) Symbol-Error-Rate when the number of subcarriers is 256, the modulation mode is 16-QAM, the clipping threshold is 1.5 and the redundancy of system is 0.59%. The floor of Symbol-Error-Rate is reduced from 10(-3) to 3.10(-5). The arithmetic achieves the better effect if the threshold is lower.