An Enhanced Partial Transmit Sequence Based on Combining Hadamard Matrix and Partitioning Schemes in OFDM Systems

Abstract

The partial transmit sequence (PTS) considered as one of the efficient approaches to restrain the high peak to average-power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) frameworks. PTS relied on partitioning the input data block and rotate them with a set of the phase vectors. In this study, a novel technique is suggested to improve the PAPR reduction performance in the PTS technique by combining Hadamard matrix and the popular kinds of the partitioning schemes interleaving scheme (IL-PTS), adjacent scheme (Ad-PTS), and pseudo-random scheme (PR-PTS). The new approach employed Hadamard matrix to change some of the subcarrier phases of the partitioning scheme in the frequency-domain. The simulation results demonstrated that the new method improved the PAPR diminishment performance better than that of the PR-PTS and Ad-PTS. However, the proposed method achieved the same PAPR performance compared with the IL-PTS scheme.

Low Complexity Rotation Algorithm for Reducing PAPR in Partial Transmits Sequence

“…The CC of the IL-PTS is the lowest among the traditional schemes [24]. This result is because the IL-PTS method requires few IFFT stages to transform the subblocks in the TD depending on the Cooley-Tukey IFFT algorithm.…”

“…The PR-PTS algorithm is the most convenient traditional segmentation scheme with PAPR reduction capacity [24]. In the PR-PTS, the subcarriers are allocated arbitrarily within the subblocks, with active subcarriers assigned only once inside each subblock, as shown in Figure 3.…”

“…In the PTS technique, several subblocks are extracted by dividing the input data to reduce the high correlation level among the samples [24]. The partitioning input data sequence is the central part of the PTS technique; thus, the selection of a suitable partitioning scheme plays an essential role in mitigating the PAPR value.…”

“…Thus, V-1 of zeros inside every subblock separates the active subcarriers. The PAPR reduction capacity of the IL-PTS is the worst among the three ordinary division schemes [24]. They are owing to the periodic pattern of the subcarriers in the IL-PTS structure, which imposes a high correlation among the subcarriers.…”

A New Subblock Segmentation Scheme in Partial Transmit Sequence for Reducing PAPR Value in OFDM Systems

“…This can attribute of that the PR-PTS and Ad-PTS should implement all the stages of the IFFT to transmit the subblocks from the frequency-domain into the time-domain. In contrast, the IL-PTS scheme has low computation complexity when using Cooly-Tukey IFFT algorithm [24]. Because of the periodic transition of the subcarriers, the IL-PTS scheme does not perform all the IFFT stages to transform the subblock into the time-domain.…”