Two Novel Nonlinear Companding Schemes With Iterative Receiver to Reduce PAPR in Multi-Carrier Modulation Systems

Abstract

Abstract-Companding transform is an efficient and simple method to reduce the Peak-to-Average Power Ratio (PAPR) for Multi-Carrier Modulation (MCM) systems. But if the MCM signal is only simply operated by inverse companding transform at the receiver, the resultant spectrum may exhibit severe in-band and out-of-band radiation of the distortion components, and considerable peak regrowth by excessive channel noises etc. In order to prevent these problems from occurring, in this paper, two novel nonlinear companding schemes with a iterative receiver are proposed to reduce the PAPR. By transforming the amplitude or power of the original MCM signals into uniform distributed signals, the novel schemes can effectively reduce PAPR for different modulation formats and sub-carrier sizes. Despite moderate complexity increasing at the receiver, but it is especially suitable to be combined with iterative channel estimation. Computer simulation results show that the proposed schemes can offer good system performances without any bandwidth expansion.Index Terms-Iterative receiver, multi-carrier modulation (MCM), nonlinear companding, peak-to-average power ratio (PAPR).

On PAPR Reduction Techniques in Mobile WiMAX

“…Among them, schemes like phase optimization (Nikookar & Lidsheim, 2002), constellation shaping (Kou et al, 2007), selective mapping (SLM) (Lim et al, 2005), nonlinear companding transforms (Jiang et al, 2006), tone reservation (TR), tone injection (TI) (Mourelo., 1999;Yoo et al, 2006), partial transmit sequence (PTS) (Han & Lee, 2004;Müller & Huber, 1997;Cimini & Sollenberger, 2000;Tellambura, 2001), clipping and filtering (Wang & Tellambura, 2005;Li & Cimini, 1998;Nee & Wild, 1998), precoding based techniques (Slimane, 2007;Min & Jeoti, 2007;Baig & Jeoti, 2010a, 2010b, 2010c, precoding based selective mapping (PSLM) techniques (Baig & Jeoti, 2010a, 2010b and phase modulation transform (Tasi et al, 2006;Thompson et al, 2008) are popular. The precoding based techniques, however, show great promise as they are simple linear techniques to implement without the need of any side M T( ) .…”

Peak-to-average power ratio reduction in OFDM systems using an adaptive differential evolution algorithm

“…The correlation among candidate signals deteriorates the PAPR reduction performance in PTS. The correlation among candidate signals is governed by two factors-one is the sub-block partition style as described in [6] and the other is the value of phase weighting factor set. So it is possible to alter these two factors to produce candidate signals with diminished correlation, so as to prevent degradation of the PAPR reduction performance.…”

“…But the major defect regarding OFDM systems is the high peak-to-average power ratio (PAPR). Many PAPR reduction approaches have already been proposed such as clipping [2] and peak windowing, block coding [3], scrambling [4], nonlinear commanding transform schemes [5,6]. The most effective and efficient PAPR reduction method is the partial transmit sequence (PTS) approach in which the signal sub-blocks obtained by splitting the input data block are multiplied by phase weighting factors and then summed up to produce an alternative transmit without any loss of information.…”

PAPR reduction of OFDM using invasive weed optimization-based optimal peak reduction tone set selection

“…One of the major problems is its sensitivity to peak-to-average power ratio (PAPR) of transmitted signals, and some schemes have been proposed to reduce the PAPR in OFDM systems [3,4]. High PAPR results in a way that an OFDM receiver's detection efficiency becomes very sensitive to nonlinear devices used in a signal processing loop, such as digitalto-analog converter (DAC) and high-power amplifier, which may severely impair performance due to induced spectral regrowth and detection efficiency degradation [5,6]. Therefore, it is very important to accurately identify PAPR distribution in OFDM systems to work out some effective measures to curb PAPR.…”

“…To reduce the PAPR of OFDM signals, numerous techniques have been proposed in the literature [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A comprehensive tutorial review of PAPR reduction techniques in OFDM systems is summarized in [3,4].…”