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
doaj +4 more sources
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
doaj +2 more sources
THE REDUCTION OF PAPR IN OFDM BY USING NEW COMPANDING TRANSFORM
International Journal of Power System Operation and Energy Management, 2014 The main drawback of the OFDM is its high peak to average power ratio(PAPR).There are several PAPR reduction techniques. Among the various PAPR reduction techniques, companding transform is attractive for its simplicity and effectiveness. This paper proposes a new companding algorithm.
T. NAGARAJU, K. RAMANAIDU
openaire +3 more sources
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
doaj +1 more source
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
doaj +1 more source
Piecewise Companding Transform Assisted Optical-OFDM Systems for Indoor Visible Light Communications
IEEE Access, 2017 In visible light communications (VLCs) relying on intensity-modulation and direct detection (IM/DD), the conversion from electrical signals to optical signals and the limited dynamic range of the light-emitting diodes (LEDs) constitute the fundamental ...
Hongming Zhang +2 more
doaj +2 more sources
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
PAPR in AFDM: Upper Bound and Reduction With Normalized μ-Law Companding
IEEE AccessAffine Frequency Division Multiplexing (AFDM) is an advanced waveform technique designed for environments with significant Doppler shifts and time-frequency dispersion.
Vundela Madhava Reddy +1 more
doaj +2 more sources
A hardware prototype of wideband high‐dynamic range analog‐to‐digital converter
IET Circuits, Devices &Systems, Volume 17, Issue 4, Page 181-192, July 2023., 2023 The authors present a hardware prototype of a high‐dynamic range analog‐to‐digital converter (ADC) where a folding operation enhances the dynamic range. The authors show sampling and perfect reconstruction of different classes of signals whose dynamic ranges are larger than that of ADC's dynamic range.
Satish Mulleti +5 more
wiley +1 more source
PAPR reduction technique for FBMC based visible light communication systems
IET Communications, Volume 16, Issue 15, Page 1807-1814, September 2022., 2022 Abstract One of the critical challenges in multicarrier‐based systems is peak to average power ratio (PAPR). Recently, Filter Bank Multicarrier (FBMC) is proved to be a promising candidate that can replace the traditional orthogonal multiplexing division (OFDM) scheme due to its better spectral efficiency, reducing both inter‐channel interference (ICI)
Gerges M. Salama +7 more
wiley +1 more source