Side information embedding scheme for PTS based PAPR reduction in OFDM systems

Abstract

Partial transmit sequence (PTS) is one of the well-known probabilistic schemes in reducing peak-to-average power ratio (PAPR) for orthogonal frequency division multiplexing (OFDM) signal. In our paper, we address the two major concerns of the PTS–OFDM system: side information (SI) free transmission from transmitter end and complexity reduction of the generated candidates. In the proposed scheme, side information is embedded on the locations of higher power subcarriers at specific partitions within the data block and at the receiver side extraction of SI is based on the power disparity among data symbols in the partitions. The error performance of the proposed scheme over the AWGN channel is analyzed mathematically. Besides, time efficiency of the proposed algorithm has been estimated in respect of computations required for finding the optimal candidates. Simulation results confirm that our proposed SI free transmission scheme performs well in terms of low BER degradations over the AWGN and Rayleigh fading channels, better SI error detection probability, lesser computations and improved PAPR reductions of the OFDM signals.

Keywords

• Orthogonal Frequency Division Multiplexing
• Peak-to-Average Power Ratio
• Partial transmit sequence
• Side Information detection failure
• Bit Error Rate