Embedded SI Partial Transmit Sequence with improved bit error rate

OFDM is a multicarrier modulation scheme with high bandwidth efficiency and robustness to multipath environment used in high data rate transmission. However, a drawback of this system is the large peak-to-average-power ratio (PAR) of the transmit signal which makes its straightforward implementation quite costly. PAR in an OFDM based system can be reduced significantly by PTS method for which data recovery requires side information (SI) about the phases used at transmitter. Sending SI, not only reduces the rate, but also increases BER, for any error in SI detection can damage a large amount of transmitted information. By introducing a new phase set, we propose a PTS based method for MPSK modulation that doesnpsilat need to explicitly send side information. Simulation results demonstrate the good performance of proposed method in PAR reduction at the expense of adding a little more complexity to the receiver structure. The main drawback of this method is BER degradation in modulations with alphabet size greater than 8. To reduce BER, another algorithm based on set partitioning is suggested. Simulation results show that by degradation of about 0.4dB in PAR reduction, SNR can improve about 2dB when the modulation is 16PSK.