Peak to average power ratio reduction in spectrally efficient FDM systems

Spectrally efficient FDM (SEFDM) systems are new and attractive multicarrier systems that can significantly enhance spectral utilization. However, as a multicarrier system SEFDM is prone to high peak to average power ratio (PAPR). In this work we present for the first time a study of the PAPR in SEFDM systems. We explore the performance of standard PAPR reduction techniques and propose a novel PAPR reduction algorithm, based on sliding a time window across an extended SEFDM symbol period, therefore termed the SLiding Window (SLW) PAPR reduction technique. Numerical simulations confirm this new technique efficacy in PAPR reduction and show no side effects. Furthermore, a complete transmitter that employs SLW is proposed based on the SEFDM IDFT transmitter. SLW shows remarkable PAPR reduction with no spectral spreading or Bit Error Rate (BER) compromises at a much reduced complexity when compared to standard Partial Transmit Sequence (PTS) and Selective Mapping (SLM) PAPR reduction techniques.