A combined PTS & SLM approach with dummy signal insertion for PAPR reduction in OFDM systems

Abstract

A novel combined approach of SLM (Selective Mapping), PTS (Partial Transmit Sequence) and DSI (Dummy Signal Insertion) is proposed to diminish PAPR (Peak to Average Power Ratio) and OBI (Out of Band Interference) in OFDM (Orthogonal Frequency Division Modulation) systems. The efficiency of OFDM decreases while the cost of installing HPA (High Power Amplifier) increases when the PAPR factor is high. A lot of research has been done to minimize this factor. The proposed method reduces the computational complexity by minimizing the number of IFFT (Inverse Fast Fourier Transform) operation to a half and the results show an effective decrement of PAPR by 0.6 ~ 1.4 dB. It also proved from the simulation results that it has 3.2 ~ 4 dB lower OBI when compared against the conventional and existing methods.

Side Information Mitigation with new Phase Sequence for Hybrid PTS Scheme

“…In [10] a hybrid scheme was introduced in which the side information is the sum of SLM and PTS parts and the computational complexity also less than the conventional PTS scheme. In [18], proposed a hybrid scheme integrating it with dummy signal insertion and achieved a considerable decrease in PAPR with low complexity.…”

Improved PTS Technique Based on Sub-Block Weighting Method of PAPR Reduction in OFDM Signals

“…Similarly, SLM gives an effective outcome in OFDM sequence with less PAPR, but it requires Side Information (SI) of phase vectors. Though, the PTS and SLM methods are deliberated to attain satisfactory PAPR reduction performance [9][10]. In this scenario, an improved method of SW based SLM-PTS technique that involve in reduction of PAPR on the basis of complexity and also for generating an automatic side information.…”