Abstract: For every sub-carrier of the OFDM system modulated by QPSK or 4QAM symbols, two simple side information detection schemes for peak-to-average power ratio reduction of the OFDM signal using the suboptimal Partial Transmit Sequence method are proposed. By using the properties of QPSK data and marking the side information into the signal with phase rotation of QPSK data at the transmitter, the two schemes can detect the side information by simple operations (modulo arithmetic, subtract operation and compare operation) at the receiver. The proposed schemes can lead to significant reduction in computational complexity. Simulation results demonstrate the good performance of the proposed schemes, especially for the scheme 2 with error correction.

Key words: partial transmit sequence, peak-to-average power ratio, side information