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Reversible Data Hiding Using Integer Wavelet Transform and Companding Technique
2005This 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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A High-Rate Optimal Transform Coder With Gaussian Mixture Companders
IEEE Transactions on Audio, Speech and Language Processing, 2007This paper examines the problem of designing fixed-rate transform coders for sources whose distributions are unknown and presumably non-Gaussian, under input-weighted squared error distortion measures. As a component of this system, a flexible scalar compander based on Gaussian mixtures is proposed.
Ethan R. Duni, Bhaskar D. Rao
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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 ...
Y. Wang, L.-H. Wang, J.-H. Ge, B. Ai
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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 ...
Yong Wang, Chao Yang, Bo Ai
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Companding Transform Assisted Constant Envelope OFDM
2023 IEEE 97th Vehicular Technology Conference (VTC2023-Spring), 2023Chongda Huang, Lilin Dan, Yue Xiao
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A Novel Piecewise Nonlinear Companding Transform for PAPR Reduction in GFDM
2018 10th International Conference on Wireless Communications and Signal Processing (WCSP), 2018Similar to the widely used orthogonal frequency division multiplexing (OFDM) scheme, Generalized Frequency Division Multiplexing (GFDM) system suffers from the problem of the high peak-to-average power ratio (PAPR). In this paper, we propose an efficient piecewise nonlinear companding transform for PAPR reduction of GFDM signals and a novel iterative ...
Yinghua Li, WeiFeng Deng
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OTFS: PAPR reduction using nonlinear companding transform
International Journal of Electronics Letters, 2023Hanumantharao Bitra, Niranjan Raj
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Low-voltage/low-power instantaneous companding circuits for continuous wavelet transform
International Conference on Neural Networks and Signal Processing, 2003. Proceedings of the 2003, 2003A general scheme for the VLSI implementation of high-frequency continuous wavelet transform is developed using instantaneous companding technique to get an elegant solution to the problem of maintaining dynamic range and high frequency operation under low power supply voltages.
null Qingxiu Huang, null Yigang He
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A novel quadrilateral companding transform for PAPR reduction in OFDM systems
Digital Signal Processing, 2019Abstract One of the major limitations of Orthogonal Frequency Division Multiplexing (OFDM) signal is high Peak-to-Average-Power-Ratio (PAPR). Non-linear companding transforms that expand small signals and compress the peak signals reduce the PAPR significantly.
Ashish Goel +2 more
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A hybrid companding transform technique for PAPR reduction of OFDM signals
2015 13th International Conference on Electromagnetic Interference and Compatibility (INCEMIC), 2015Orthogonal Frequency Division Multiplexing (OFDM) is an attractive technique for wireless communication applications. However, an OFDM signal has a large Peak-to-Average Power Ratio (PAPR), which can result in significant distortion when passed through a nonlinear device, such as a transmitter power amplifier. Number of techniques has been proposed for
D. Durga Prasad, M. V. Nageswara Rao
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