Implementation of PAPR Reduction method in OFDM with Clipping & Amplification

Abstract

1For wireless applications, an OFDM-based system can be of interest because it gives greater immunity to impulse noise, multi-path fading and eliminates necessity of equalizers. High PAPR is one of the critical problems in OFDM modulation. There are large numbers of techniques for reduction of PAPR. Selections of any method depend on PAPR Reduction performance, Data Rate loss and transmit signal power increase, Increased BER at the Receiver and computational complexity. In this paper, an efficient technique is evaluated to reduce the PAPR by making combination of the Clipping with Amplification method. Clipping can be performed in two ways-one is to clip the complex envelopes of OFDM signal and the other is to clip the In-phase (I-signal) andQuadrature phase (Q-signal) independently. Above two methods are implemented with the result that clipping the complex envelope method gives significant reduction in PAPR than clipping the In-phase (Isignal) and Quadrature phase (Q-signal) separately.

SLM-based dynamic clipping and amplification PAPR reduction schemes for interleaved OFDMA uplink systems

“…On the other hand, OFDMA has some drawbacks, such as the high amount of peak to average power ratio (PAPR) of transmitted signal. Various PAPR reduction schemes have been developed for OFDM systems, including clipping [1], amplification [2], selected mapping (SLM) [2], partial transmit sequence (PTS) [3], tone reservation (TR) [4], coding based schemes [5]- [7] and active constellation extension [8]. In this paper, two schemes are proposed to reduce PAPR.…”

Signal Clipping for PAPR in Hybrid Carrier System Based on 4-Weighted Fractional Fourier Transform

“…The iterative algorithm was proposed in [ 10 ] by estimating and canceling the distortion caused by clipping noise, and an improved method of the iterative algorithm has been proposed in [11] which presented adding soft decision of the symbols in the frequency domain at the receiver. At present, many scholars still study the clipping technique in combination with other techniques for reducing PAPR in OFDM [12][13][14][15][16]. It means that the clipping technique is still worth studying in HC systems nowadays.…”