Peak-to-Average Power Ratio Reduction in OFDM via Sparse Signals: Transmitter-Side Tone Reservation vs. Receiver-Side Compressed Sensing

Two approaches, dual to each other, for peakto- average power ratio reduction based on the use of sparse signals are assessed and compared. In tone reservation a small number of carriers is adjusted. When performing clipping only a few samples are typically affected. We utilize the possibility to optimize the transmitter-side clipping and tailor it to the corresponding receiver-side signal recovery employing compressed sensing. Moreover, we show how tone reservation and clipping can be combined. Using only few tones for algorithmic optimization at the transmitter and combining this with clipping of residual peaks (to be recovered at the received), a very attractive PAR reduction scheme results.