Partial transmit sequence using EVM optimization metric for BER reduction in OFDM systems

One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) is its high peak-to-average power ratio (PAPR). Conventional partial transmit sequence (PTS) is an efficient PAPR reduction technique. However, reducing the PAPR cannot achieve an optimal bit error rate (BER) performance when the signals are passed through a power amplifier (PA) because of nonlinear distortion. In this paper, an error vector magnitude (EVM) reduction PTS scheme is proposed to improve the BER performance in the presence of PA. By properly choosing the phase factor of the PTS, this scheme can dramatically reduce the nonlinear distortion. In addition, a simplified two-layer PTS optimization model is introduced to reduce the complexity. Simulation results show that the proposed scheme can significantly improve the BER performance while maintaining low complexity.