A new combined method of the block coding and predistortion for the nonlinear distortion compensation

This paper newly propose a combined method of the block coding and predistortion to compensate for the nonlinear distortion from the nonlinear amplifier in OFDM communication system. Though the coding efficiency is low, the block coding has coding gain as well as limits the PAPR under 3dB Even if the predistortion is used, some amount of back-off is required to remove nonlinear distortion completely. In this paper we reduce the PAPR of OFDM signal by the block coding and compensate for the nonlinear distortion by the predistortion. Therefore, the amount of required back-off is lowered so that power efficiency is improved than the only predistortion case. The proposed combined method brings about 3dB back-off gain than the single predistortion and block coding method when BPSK modulation is used and the number of subcarrier is 64. Also, when IBO(input back-off) is 3dB, we can get 3dB and 1dB SNR gains than the only predistortion and the block coding, respectively. Via the proposed method, even in the IBO of 2dB, we can get the similar performance as the linear amplifier.