Novel efficient weighting factors for PTS-based PAPR reduction in low-power OFDM transmitters

Increased Peak-to-Average Power Ratio (PAPR) in an Orthogonal Frequency Division Multiplexing (OFDM) signal poses serious challenges in wireless telecom system design, since increased PAPR stresses the performance of analog and RF parts of a wireless modem. The Partial Transmit Sequence (PTS) algorithm is a flexible and distortionless peak power reduction scheme of low computational complexity. In this paper we experimentally derive a new set of weighting factors which improve the performance of the PTS algorithm while the computational complexity remains the same. Furthermore, this paper examines the complexity of the VLSI implementation of PTS versus the power savings in the analog part due to the PAPR reduction. It is here shown that with the new set of weighting factors the power consumption of PA is reduced by 21.1% in comparison to OFDM without PAPR reduction.