Abstract
This paper proposes an enhanced PAPR reduction technique which combines an enhanced PTS method with Mu-Law companding. The enhanced PTS method improves performances in both the partitioning and phase rotation steps. Enhancement in partitioning is achieved through a judicious incorporation of AP-PTS scheme into the IP-PTS. As for phase rotation, an optimal set of rotation vectors is derived based on the correlation properties of candidate signals. The PAPR reduction of this enhanced PTS method is further improved by annexing Mu-Law companding at the end of the enhanced PTS. This application of Mu-Law characteristic in the time domain of OFDM signal significantly improves the PAPR reduction capability of the approach. Simulation results show that the PAPR performance of the enhanced PTS method with Mu-Law companding technique on various scenarios with different modulation schemes is better than that of the PRP-PTS. This approach can be considered as a very attractive candidate for achieving a significant reduction of PAPR, while maintaining a low computational complexity.
Highlights
The OFDM structure has many advantages including high spectral efficiency, parrying interference, as well as sturdiness against signal disappearance [1]
OFDM is apt large peak-to-average power ratio (PAPR), which result in nonlinear distortion of the power amplifiers and weaken the performance of the OFDM system; this is common in Wavelength Division Multiplexing (WDM) [4, 5] and Mode Division Multiplexing [6, 7]
This is important as partial transmit sequence cord (PTS) categories of two methods that characterized as partitioning the original OFDM into a set of disjoint sub-blocks; the other one is to render a group of aspirant signs via adding phase rotated sub-blocks to select the minimum PAPR for broadcast [19]
Summary
The OFDM structure has many advantages including high spectral efficiency, parrying interference, as well as sturdiness against signal disappearance [1]. PTS is considered unique most likely to improve the PAPR of an OFDM signal because of its Longitudinal Method and zero sign deformation [17, 18] This is important as PTS categories of two methods that characterized as partitioning the original OFDM into a set of disjoint sub-blocks; the other one is to render a group of aspirant signs via adding phase rotated sub-blocks to select the minimum PAPR for broadcast [19]. All of these techniques have advantages and disadvantages in terms of their PAPR reduction capabilities, the cost of BER performance degradation, increased computational complexity, and loss of data rate.
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