Results 121 to 130 of about 275 (168)
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New companding transform for PAPR reduction in OFDM
IEEE Communications Letters, 2010High peak-to-average power ratio (PAPR) is a major drawback of orthogonal frequency division multiplexing (OFDM) systems. Among the various PAPR reduction techniques, companding transform appears attractive for its simplicity and effectiveness. This paper proposes a new companding algorithm.
Yuan Jiang
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An Efficient Nonlinear Companding Transform for Reducing PAPR of OFDM Signals
IEEE Transactions on Broadcasting, 2012In this paper, an efficient nonlinear companding scheme is proposed to reduce the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals. By transforming the statistics of original signals into a specified distribution form along with remaining an unchanged average output power level, this scheme can achieve ...
Yong Wang 0013 +3 more
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On the Nonlinear Companding Transform for Reduction in PAPR of MCM Signals
IEEE Transactions on Wireless Communications, 2007In this paper, we provide the design criteria of the nonlinear companding transforms for reduction in peak-to-average power ratio (PAPR) of multi-carrier modulation (MCM) signals, which can enable the original MCM signals to be transformed into the desirable distribution.
Tao Jiang, Weidong Xiang, Daiming Qu
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Reduction of PAPR of OFDM Signals Using Nonlinear Companding Transform
Wireless Personal Communications, 2012In this paper, we propose and evaluate a novel nonlinear companding transform (NCT) scheme for peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems. The key idea of the proposed scheme is to transform the original Gaussian-distributed OFDM signals into a specific statistics form, whose target ...
Jianhua Ge, Ge Jianhua
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An adaptive companding transform for OFDM systems
Proceedings of the IEEE 6th Circuits and Systems Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication (IEEE Cat. No.04EX710), 2004 A novel adaptive companding transform scheme is proposed to efficaciously reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) signals. The feasible adaptive companding algorithm is proposed and discussed too.
null Gang Yang +2 more
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Iterative companding transform and filtering for reducing PAPR of OFDM signal
IEEE Transactions on Consumer Electronics, 2015In this paper, an efficient Iterative Companding Transform and Filtering (ICTF) technique is proposed for reducing the Peak-to-Average Power Ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM) signal. By means of a specially designed iterative procedure, ICTF is able to obtain both an improved Bit Error Rate (BER) and minimized Out-of ...
Bo Ai
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Reversible Data Hiding Using Integer Wavelet Transform and Companding Technique
, 2005 This paper presents a novel reversible data-embedding method for digital images using integer wavelet transform and companding technique. This scheme takes advantage of the Laplacian-like distribution of integer wavelet coefficients in high frequency subbands, which facilitates the selection of compression and expansion functions and keeps the ...
Guorong Xuan +4 more
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Linear Companding Transform for the Reduction of Peak-to-Average Power Ratio of OFDM Signals
IEEE Transactions on Broadcasting, 2009A major drawback of orthogonal frequency-division multiplexing (OFDM) signals is their high peak-to-average power ratio (PAPR), which causes serious degradation in performance when a nonlinear power amplifier (PA) is used. Companding transform (CT) is a well-known method to reduce PAPR without restrictions on system parameters such as number of ...
Sulaiman A Aburakhia +2 more
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Bit-Error-Rate Performance of Companding Transforms for OFDM
IEEE Transactions on Vehicular Technology, 2013This paper provides a comprehensive analytical framework to assess the relative bit-error-rate (BER) performance of companding transforms (CTs) employed to reduce the peak-to-average-power ratio (PAPR) in orthogonal frequency-division multiplexing (OFDM) systems.
Yasir Rahmatallah +2 more
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Nonlinear companding transform for PAPR reduction of OTFS signals
Journal of Optical Communications, 2022Abstract Peak-to-Average Power Ratio (PAPR) is one of the major limitations of an Orthogonal time frequency space (OTFS) signals. To reduce the PAPR, a simple non-linear companding transform is proposed in this paper. The proposed companding transform mainly compresses the large amplitudes and slightly enhances the small amplitudes such ...
Hanumantharao Bitra +2 more
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