Iterative Correction and Decoding of OFDM Signals Affected by Clipping

Rave, Wolfgang; Zillmann, Peter; Fettweis, Gerhard

doi:10.1007/1-4020-4437-2_48

Cited by 12 publications

(15 citation statements)

References 4 publications

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“…7 below. The scheme outlined above combines the techniques in [12]- [15] and [28]. Removing the correlation between and means that can be more accurately modeled as additive noise samples, which has two beneficial consequences.…”

Section: Comparisons With Existing Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

“…In [12]- [15], clipping distortion is estimated and then partially canceled at the receiver. A key step in the works in [12]- [15] is to compute the means for the original signals before clipping using decoder feedbacks. The technique developed in [28] involves both means and variances of the original signals, which offers noticeable performance gains.…”

mentioning

confidence: 99%

“…The proposed technique combines the works in [12]- [15] and [28]: Price's result is used to remove the correlation between the original signals and clipping distortions; and both means and variances of the original signals computed from the decoder feedbacks are used to estimate the clipping distortions. This combined technique ensures the effectiveness of iterative detection and brings about considerable performance gains.…”

mentioning

confidence: 99%

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Iterative Soft Compensation for OFDM Systems with Clipping and Superposition Coded Modulation

Tong

Ping

Zhang

et al. 2010

IEEE Trans. Commun.

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Abstract-This paper deals with the clipping method used in orthogonal frequency-division multiplexing (OFDM) systems to reduce the peak-to-average power ratio (PAPR). An iterative soft compensation method is proposed to mitigate the clipping distortion, which can outperform conventional treatments. The impact of signaling schemes on the residual clipping noise power is studied via the symbol variance analysis. It is found that superposition coded modulation (SCM) can minimize the residual clipping noise power among all possible signaling schemes. This indicates that SCM-based OFDM systems are more robust to clipping effect than other alternatives when soft compensation is applied. It is also shown that a multi-code SCM scheme can further reduce the clipping effect and its overall performance can be quickly evaluated using a semi-analytical evolution method. Numerical examples are provided to verify the analysis.

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Section: Comparisons With Existing Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Iterative Soft Compensation for OFDM Systems with Clipping and Superposition Coded Modulation

Tong

Ping

Zhang

et al. 2010

IEEE Trans. Commun.

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“…Several approaches have been investigated for mitigating the clipping noise with an amount of computational complexity, such as iterative methods [6][7][8][9][10] and an oversampling method [11].…”

Section: Introductionmentioning

confidence: 99%

Probability distribution analysis of M-QAM-modulated OFDM symbol and reconstruction of distorted data

Yoo

Guilloud

Pyndiah

2011

EURASIP J. Adv. Signal Process.

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It is usually assumed that N samples of the time domain orthogonal frequency division multiplexing (OFDM) symbols have an identical Gaussian probability distribution (PD) in the real and imaginary parts. In this article, we analyze the exact PD of M-QAM/OFDM symbols with N subcarriers. We show the general expression of the characteristic function of the time domain samples of M-QAM/OFDM symbols. As an example, theoretical discrete PD for both QPSK and 16-QAM cases is derived. The discrete nature of these distributions is used to reconstruct the distorted OFDM symbols due to deliberate clipping or amplification close to saturation. Simulation results show that the data reconstruction process can effectively lower the error floor level.

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On the iterative mitigation of clipping noise for COFDM transmissions

Dejardin

Colas

Gellé

2008

Trans Emerging Tel Tech

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SUMMARYLarge peak-to-average power ratio (PAPR) of multicarrier communication systems is a widely discussed topic in the literature and remains the major drawback of the orthogonal frequency division multiplexing (OFDM) modulation. Deliberate amplitude clipping has been found as a suitable way to reduce output signal peaks at the transmitter side. Unfortunately, it also causes numerous degradations. In this paper, we propose a study of nonlinearities led by the clipping process and a comparison of iterative receivers derived from the turbo-principle and devoted to the system performance restoration under severe clipping ratio (CR) constraint.

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Iterative Correction and Decoding of OFDM Signals Affected by Clipping

Cited by 12 publications

References 4 publications

Iterative Soft Compensation for OFDM Systems with Clipping and Superposition Coded Modulation

Iterative Soft Compensation for OFDM Systems with Clipping and Superposition Coded Modulation

Probability distribution analysis of M-QAM-modulated OFDM symbol and reconstruction of distorted data

On the iterative mitigation of clipping noise for COFDM transmissions

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