Root-Based Nonlinear Companding Technique for Reducing PAPR of Precoded OFDM Signals [PDF]
IEEE Access, 2018 Orthogonal frequency division multiplexing (OFDM) signals are characteristically independent and identically distributed Gaussian random variables that follow Rayleigh distribution. The signals also exhibit high peak-to-average power ratio (PAPR) problem
Kelvin Anoh +3 more
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Reversible Data Hiding for DICOM Image Using Lifting and Companding
Cryptography, 2019 In this work, a reversible watermarking technique is proposed for DICOM (Digital Imaging and Communications in Medicine) image that offers high embedding capacity (payload), security and fidelity of the watermarked image.
Amit Phadikar +2 more
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A Simplified Scheme of Estimation and Cancellation of Companding Noise for Companded Multicarrier Transmission Systems [PDF]
Radioengineering, 2015 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-error-rate (BER) performance of the ...
S. Peng +4 more
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Companding transform technique combined with iterative filtering for reducing PAPR of OFDM signals [PDF]
Tongxin xuebao, 2015 Considering the drawbacks of the traditional companding transforms，an efficient companding scheme combined with iterative filtering was proposed to reduce the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals.
Chao YANG, Yong WANG, Jian-hua GE
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A Simple Nonlinear Companding Transfrom for Nonlinear Compensation of Direct-Detection Optical OFDM Systems [PDF]
International Journal of Electronics and Telecommunications, 2020 In direct-detection OFDM systems, the nonlinear effects caused by optical modulation and fiber transmission can degrade the system performance severely.
Trang T. Ngo, Nhan D. Nguyen
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Nonlinear companding transform for PAPR reduction in lattice-OFDM system [PDF]
Tongxin xuebao, 2015 Since the inherent higher peak-to-average power ratio (PAPR) in lattice OFDM (LOFDM) is higher than that of conventional OFDM systems, a novel continuous and differentiable nonlinear companding scheme is investigated and analyzed when employing the ...
Si-ming PENG +4 more
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A HYBRID TECHNIQUE FOR PAPR REDUCTION OF OFDM USING DHT PRECODING WITH PIECEWISE LINEAR COMPANDING [PDF]
ICTACT Journal on Communication Technology, 2016 Orthogonal Frequency Division Multiplexing (OFDM) is a fascinating approach for wireless communication applications which require huge amount of data rates.
Thammana Ajay, K. Murali Krishna
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Research on Digital Steganography and Image Synthesis Model Based on Improved Wavelet Neural Network. [PDF]
Comput Intell Neurosci, 2022 Network compression coding technology is a research hotspot in the field of digital steganography and image synthesis. How to improve image quality while achieving short compression time is a problem currently faced. Based on the improved wavelet neural network theory, this paper constructs a digital steganography and image synthesis model.
Li X, Yao R, Lee J.
europepmc +2 more sources
Simple Solution for Designing the Piecewise Linear Scalar Companding Quantizer for Gaussian Source
Radioengineering, 2013 To overcome the difficulties in determining an inverse compressor function for a Gaussian source, which appear in designing the nonlinear optimal companding quantizers and also in the nonlinear optimal companding quantization procedure, in this paper a ...
J. Nikolic, Z. Peric, L. Velimirovic
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Speech Technology Progress Based on New Machine Learning Paradigm. [PDF]
Comput Intell Neurosci, 2019 Speech technologies have been developed for decades as a typical signal processing area, while the last decade has brought a huge progress based on new machine learning paradigms. Owing not only to their intrinsic complexity but also to their relation with cognitive sciences, speech technologies are now viewed as a prime example of interdisciplinary ...
Delić V +8 more
europepmc +2 more sources