Implementation of PAPR Reduction in OFDM System Based on Clipping Technique with EVM

摘要

The resistance to peak-to-average power ratio (PAPR) for orthogonal frequency division multiplexing (OFDM) communication system is analyzed and implemented on the basis of clipping technique.As two main quality criteria,error vector magnitude (EVM) and out-of-band power spectrum density (PSD) attenuation are adopted to check up the performance of clipping operation.For an OFDM system with 2MHz bandwidth and 340MHz center frequency,we calculate and compare PAPR reduction in the cases of different peak power clipping thresholds,where the average power of OFDM symbols is normalized to 0dB.The simulation results show that the peak power clipping threshold in the range of 6-8dB is suitable for the special OFDM system.In that case,the EVM is less than 3.5％ and PSD attenuation curve approaches that without clipping operation.