Low Complexity SLM-Based PTS PAPR Reduction Scheme for OFDMA Uplink Systems

High peak to average power ratio (PAPR) is one of the main drawbacks of Orthogonal Frequency Division Multiple Access (OFDMA) systems. In this paper we will introduce a PAPR reduction scheme based on selected mapping (SLM) and partial transmit sequence (PTS) techniques. The deficiency for PAPR reduction in SLM is computational complexity. We investigate one of the low complexity SLM schemes and apply partial transmit sequence continuously. The main idea is to generate some candidate signals from original data and then partition the data into subblocks. Evaluating computational complexities in terms of subcarriers and the number of candidate signals show that the number of complex operations for proposed scheme is lower than SLM or combined SLM-PTS techniques. In addition, the performance of complementary cumulative distribution function (CCDF) of proposed method gets close to SLM or combined SLM-PTS schemes by incrementing the number of candidate signals.