Improved PAPR Reduction of OQAM-OFDM Signal Using Segmental PTS

Abstract

In this paper, a novel segmental partial transmit sequence (S-PTS) scheme is proposed for the peak-to-average power ratio (PAPR) reduction in offset quadrature amplitude modulation based orthogonal frequency-division multiplexing (OQAM-OFDM) systems. The key idea of the S-PTS scheme is to divide the overlapped OQAM-OFDM signals into a number of segments, and then some disjoint subblocks are divided and multiplied with different phase rotation factors in each segment. Compared with the conventional PTS scheme directly employed in OQAM-OFDM sytems, the S-PTS scheme could offer better PAPR reduction with lower computational complexity. Similar to OFDM systems, one of the major drawbacks in OQAM-OFDM systems is high peak-to-average power ratio. In OFDM systems, the distribution of PAPR has been derived by theoretical approaches and various methods have been proposed to tackle the PAPR problem such as the selective mapping and partial transmit sequence schemes.

Nevertheless, it is not very effective to directly employ these methods in OQAM-OFDM systems, since by proposing the OQAM-OFDM signals are overlapped with multiple adjacent data blocks to give better PAPR reduction using different solidstate power amplifier (SSPA) levels in S-PTS,O-SLM ,C-PTS. Experimental

results can justify that our proposed technique can give more desirable results than traditional methods.