Peak-to-Average Power Ratio Reduction of OFDM Signals With Nonlinear Companding Scheme

Hou, Jun; Ge, Jianhua; Zhai, Dewei; Li, Jing

doi:10.1109/tbc.2010.2046970

Cited by 108 publications

(14 citation statements)

References 20 publications

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Section: Simulation Resultsmentioning

confidence: 99%

“…We consider an un-coded OFDM system with the number original signals u-law scheme in [2] EC scheme in [4] TC scheme in [6] Proposed, m=1 c=0. EC scheme in [4] TC scheme in [6] Proposed: m=1 c=0. u-law scheme in [2] EC scheme in [4] TC scheme in [6] Proposed: m=1 c=0.1 Proposed: m=2 c=0.2 schemes over the additive Gaussian white noise (AWGN) channel for QPSK and 16QAM, respectively.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…EC scheme in [4] TC scheme in [6] Proposed: m=1 c=0. u-law scheme in [2] EC scheme in [4] TC scheme in [6] Proposed: m=1 c=0.1 Proposed: m=2 c=0.2 schemes over the additive Gaussian white noise (AWGN) channel for QPSK and 16QAM, respectively. As observed, our scheme can obtain better BER performance than the referred schemes.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Recently, a variety of NCT schemes with better performances have been proposed, including the exponential companding (EC) [4], piecewise companding (PC) [5], and trapezoidal companding (TC) [6], etc. However, these schemes are limited under certain bit error rate (BER) performance constraint [7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Efficient Nonlinear Companding Transform Scheme for Reducing PAPR of OFDM Signals

Li¹

2017

IJCNS

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Efficient nonlinear companding transform (NCT) scheme for reducing peakto-average power (PAPR) of orthogonal frequency division multiplexing (OFDM) signals is proposed. This scheme transforms the Gaussian-distributed signals into the specified statistics form defined as a piecewise function. By adjusting the transform parameters, it enables more design flexibility in companding form so that a favorable trade-off between PAPR and bit error rate (BER) can be offered. Compared to existing techniques, the scheme can achieve an effective reduction in PAPR as well as an improved BER performance simultaneously.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Simulation Resultsmentioning

confidence: 99%

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Efficient Nonlinear Companding Transform Scheme for Reducing PAPR of OFDM Signals

Li¹

2017

IJCNS

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“…Conventional decompanding operation can approximately remove the companding noise at the receiver [13], [14], [15], [16], but the channel noise will be amplified by the decompanding function simultaneously, and consequently, the system performance will not be so optimistic especially under low signal-to-noise ratio (SNR) region. In order to avoid amplifying the channel noise caused by the decompanding operations, in [17], the authors proposed to abandon the decompanding operation at the receiver, and although a great BER performance improvement can be achieved, however, there is still a relative large gap of BER performance away from the performance bound. In [19], the authors proposed an iterative receiver to estimate and cancel the companding noise.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Scheme of Estimation and Cancellation of Companding Noise for Companded Multicarrier Transmission Systems

Peng¹,

Zeng²,

You³

et al. 2015

RADIOENGINEERING

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Abstract.Nonlinear companding transform is an efficient method to reduce the high peak-to-average power ratio (PAPR) of multicarrier transmission systems. However, the introduced companding noise greatly degrades the bit-errorrate (BER) performance of the companded multicarrier systems. In this paper, a simplified but effective scheme of estimation and cancellation of companding noise for the companded multicarrier transmission system is proposed. By expressing the companded signals as the summation of original signals added with a companding noise component, and subtracting this estimated companding noise from the received signals, the BER performance of the overall system can be significantly improved. Simulation results well confirm the great advantages of the proposed scheme over other conventional decompanding or no decompanding schemes under various situations.

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An optimal nonlinear companding transform with clipping scheme for universal filtered multicarrier systems

Chintala

Anuradha

2020

Int J Communication

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SummaryIn this article, an exponential companding (EC) scheme, which can reduce PAPR without raising the average output power level, is proposed for universal filtered multi carrier (UFMC) signals. However, EC scheme degrades the BER performance. Therefore, an optimal nonlinear companding transform named as “modified exponential companding” (MEC), which can use two companding levels based on a threshold value, is proposed. The proposed MEC scheme shows enhanced PAPR and BER performances than EC scheme. Moreover, the MEC provides more design flexibility and freedom with an unchanged average output power level. Furthermore, a hybrid scheme is also proposed to improve PAPR performance, where clipping operation is employed on MEC signal based on an appropriate clipping threshold. Simulation results illustrate that proposed MEC scheme offers improved system performance with a net gain of 7.22 dB than conventional EC and μ‐law techniques. Besides, the proposed hybrid scheme with clipping ratio 1.3 proffers enhanced PAPR reduction of 8.85 dB and improved net gain of 7.95 dB. Also, the proposed EC, MEC, and hybrid schemes can provide lesser spectrum side‐lobe levels than μ‐law. Finally, the UFMC system with the proposed hybrid scheme is verified by employing wireless open‐access research platform (WARP) as hardware over real‐time channel.

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Peak-to-Average Power Ratio Reduction of OFDM Signals With Nonlinear Companding Scheme

Cited by 108 publications

References 20 publications

Efficient Nonlinear Companding Transform Scheme for Reducing PAPR of OFDM Signals

Efficient Nonlinear Companding Transform Scheme for Reducing PAPR of OFDM Signals

A Simplified Scheme of Estimation and Cancellation of Companding Noise for Companded Multicarrier Transmission Systems

An optimal nonlinear companding transform with clipping scheme for universal filtered multicarrier systems

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