An evaluation of modified -Law companding to reduce the PAPR of OFDM systems

Vallavaraj, A.; Stewart, Brian G.; Harrison, David K.

doi:10.1016/j.aeue.2009.07.013

Cited by 25 publications

(17 citation statements)

References 9 publications

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“…It performs better than exponential companding in terms of P APR reduction, power spectrum, and BER performance. Recently, a modified mu-Iaw based companding has been given by Vallavara et al [86], which shows better performance thanmu-Iaw companding.…”

Section: Non-linear Companding Transform (Nct)mentioning

confidence: 99%

“…The J..L-law companding transform mainly focuses on enlarging small amplitude signals while keeping peak signals unchanged, and thus it increase the average power of the transmitted signals and possibly results in exceeding the saturation region of HP A to make the system performance worse. In order to overcome the problem of J..L-law companding (increasing average power) and to have efficient P APR reduction, some more non-linear transform have been suggested in the literature [82][83][84][85][86]. This includes error function based transform [82], exponential function based transforms [83], and special airy function based transforms [84].…”

Section: Non-linear Companding Transform (Nct)mentioning

confidence: 99%

“…A lot of companding techniques are available in the literature [81][82][83][84][85][86].The basic concept of most of the companding techniques is to transform the Rayleigh distributed OFDM signal into a uniformly distributed signal. The first nonlinear companding technique for P APR reduction was given by Wang et.aZ in 1999 [81].…”

Section: Non-linear Companding Transform (Nct)mentioning

confidence: 99%

See 2 more Smart Citations

OFDM and its Major Concerns: A Study with Way Out

Saxena

Joshi

2013

IETE Journal of Education

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Section: Non-linear Companding Transform (Nct)mentioning

confidence: 99%

Section: Non-linear Companding Transform (Nct)mentioning

confidence: 99%

Section: Non-linear Companding Transform (Nct)mentioning

confidence: 99%

See 1 more Smart Citation

OFDM and its Major Concerns: A Study with Way Out

Saxena

Joshi

2013

IETE Journal of Education

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“…In this paper, M-QAM signals were not considered because Equation 12 cannot be used for the M-QAM constellations, as stated in [11, 12, 13, 14, 15, and 16] and as proven in [17,18,19]. The upper limits for M-QAM are given in the literatures [20,21] …”

Section: The Proposed Methodsmentioning

confidence: 99%

PAPR Reduction of OFDM Systems using 2D Inverse Discrete Fourier Transform

Hassoon¹,

Ruhaima²,

Alghrairi³

2017

IJCA

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A tow-dimensional (2D) orthogonal frequency division multiplexing (OFDM) system with peak-to-average power ratio (PAPR), a multicarrier system, is an important part of wireless communications engineering. Since these signals divide the bandwidth into other sub channels n, so the OFDM signals accomplish top data rates. Although, High peak-toaverage power ratio (PAPR) of the transmit signal is a major problem of multicarrier transmission such as orthogonal frequency division multiplexing (OFDM). To make fewer the PAPR values, There are many of techniques have been introduced, including selected mapping and amplitude clipping. The method that produces the least bit-error rate (BER) performance, its method is Amplitude clipping and filtering which is the simplest method. And from the other side, SLM although it presents a computational complexity, it is considered the most suitable and distortion less. In this research, a new technique is proposed based on twodimensional discrete Fourier transform (2D-DFT). In this paper we present a new method that reduces the computational complexities and distortion less compared to the SLM method. The M-PSK mapping types show from theoretical analysis that the PAPR can be reduced to something like 0.0 dB, as proven mathematically and by computer simulations.

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“…A survey of published papers details recent advances in this eld, including several attempts to overcome the PAPR shortcoming such as clipping and ltering [1,2], Partial Transmit Sequence (PTS) [3,4], Selected Mapping (SLM) [5], active constellation extension [6], companding [7], etc. Among these methods, clipping and ltering seems to be one of the simplest and most e ective solutions, especially when the number of OFDM subcarriers is large.…”

Section: Introductionmentioning

confidence: 99%

Amplitude reconstruction of clipped OFDM by using DFT-based least squares

Ahmadi

Talebi

2017

Scientia Iranica

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Abstract. OFDM is an e ective multicarrier transmission technique with one primary disadvantage; it su ers from high Peak-to-Average Power Ratio (PAPR). Although clipping and ltering is a simple and e ective method for PAPR reduction, it makes in-band and out-of-band noise, which degrades the bit error rate performance and spectral e ciency. Publications on this subject show that clipped samples could be reconstructed at the receiver by using oversampled signal and bandwidth expansion. By building on published literature, this paper aims to achieve a low-complexity method. The proposed method has complexity order of O(L 2 ) to solve linear system, where L indicates the number of clipped samples. Simulation results con rm that our proposed method leads to both a better biterror rate performance and a lower complexity than similar methods. These results also show that our method o ers adequate performance, especially at low clipping ratios.

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An evaluation of modified -Law companding to reduce the PAPR of OFDM systems

Cited by 25 publications

References 9 publications

OFDM and its Major Concerns: A Study with Way Out

OFDM and its Major Concerns: A Study with Way Out

PAPR Reduction of OFDM Systems using 2D Inverse Discrete Fourier Transform

Amplitude reconstruction of clipped OFDM by using DFT-based least squares

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