AbstractThe orthogonal frequency division multiplexing uses as a high-speed information transmission technology, with excellent anti-interference capabilities, which also has its own shortcomings, such as high peak-to-average power ratio. In order to reduce hardware complexity and enhance the quality of transmission, there are methods about reducing the PAPR value of OFDM system. The most recently, method of PTS and method of clipping can significantly improved OFDM system PAPR performance, but they have plenty of deficiencies. This paper provided an method of arithmetic of improving companding transform that combines with improving PTS. The certification shows that hardware implementation is improved compared with the method of PTS, which BER performance is ameliorated in comparison with the method of companding transform.