An Analysis on the Conventional Partitioning Schemes of Partial Transmit Sequence in OFDM Systems

Abstract

Partial transmit sequence (PTS) is considered an efficient algorithm to overcome the problem of high peak to average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. PTS technique is depending on the partitioning of the input data sequence into the several subblocks, and weighting these subblocks with a set of the phase rotation factors. There are three common types of partitioning schemes: interleaving scheme (IL-PTS), adjacent scheme (Ad-PTS), and pseudo-random scheme (PR-PTS). The three ordinary partitioning schemes have various performances in terms of the PAPR reduction and the computational complexity. In this paper, the three ordinary partition schemes are analyzed and discussed depending on the PAPR mitigation performance and the computational complexity. The simulation results indicated that the PR-PTS scheme could achieve the superiority in terms of PAPR reduction compared with other schemes. Furthermore, the numerical calculations recorded that the computational complexity of the ordinary partitioning schemes increases exponentially with increasing the number of the subblocks.

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“…Next, the data sequences of each symbol are then converted from serial to parallel form and the parallel samples are then passed through N-IFFT to modulate the samples by N-independent subcarriers to produce the timedomain OFDM signals. After that, the OFDM signals are converted back to serial form and the cyclic pre x (CP) samples are then attached by copying samples of the last part of the symbol into the front of it to prevent the symbols from inter-symbol interference (ISI) distortion [21]. Lastly, the OFDM signal is transmitted to the receiver side through the channel environment while, the whole operations done by the transmitter are reversed to recover the original transmitted binary data at the receiver side [22].…”