PAPR Reduction for OFDM Transmission by using a method of Tone Reservation and Tone Injection

This paper tends to reduce the Peak-to-Average Power Ratio (PAPR) of the Orthogonal Frequency Division Multiplexing (OFDM) signal by using a method of Tone Reservation and Tone Injection. To reduce the peak of the OFDM signal, the proposed method is based on the reservation of some tones that are not used to carry data symbols. The proposed method replaces the appropriate chosen tones that carry data symbols with the dummy symbols. Data symbols, which are carried by replaced tones, are carried by reserved tones. The magnitude of the signal constellation of the dummy symbols must be larger than that of the original OFDM symbol so that the positions of the replaced tones can be easily detected by the receiver. There is no need to send any side information. The proposed method with proposed iterative search algorithm is an efficient scheme to reduce the PAPR of the OFDM signal with low complexity. However, it retards data rate and increases a little average power of the transmitter due to the dummy symbols that replace some tones and the usage of larger signal constellation.