Results 11 to 20 of about 1,441 (173)

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, Lie-Liang Yang, Lajos Hanzo   +2 more
doaj   +2 more sources

The Research on Improved Companding Transformation for Reducing PAPR in Underwater Acoustic OFDM Communication System

Discrete Dynamics in Nature and Society, 2016
To solve the problem of the high peak-to-average power ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) for the underwater acoustic communication system, the paper offers a method of reducing PAPR which combines the amplitude limiting ...
Jinqiu Wu, Gang Qiao, Xiaofei Qi
doaj   +2 more sources

Companding and Predistortion Techniques for Improved Efficiency and Performance in SWIPT

IEEE Transactions on Green Communications and Networking
In this work, we analyze how the use of companding techniques, together with digital predistortion (DPD), can be leveraged to improve system efficiency and performance in simultaneous wireless information and power transfer (SWIPT) systems based on power splitting.
Santiago Fernández, F Javier Lopez-Martinez, Fernando Gregorio   +2 more
exaly   +4 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

PALM CLIPPING AND NONLINEAR COMPANDING TECHNIQUES BASED PAPR REDUCTION IN OFDM-DCSK SYSTEM

Journal of Engineering and Sustainable Development, 2021
The main drawback of the Orthogonal Frequency Division Multiplexing (OFDM) with Differential Chaos Shift Keying (DCSK) that is named (OFDM-DCSK) is the high Peak to Average Power Ratio (PAPR).
Sajjad R. Abdulridha, Fadhil S. Hasan
doaj   +3 more sources

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, Perić Z, Sečujski M, Jakovljević N, Nikolić J, Mišković D, Simić N, Suzić S, Delić T.   +8 more
europepmc   +2 more sources

The Mars Science Laboratory (MSL) Mast cameras and Descent imager: Investigation and instrument descriptions. [PDF]

Earth Space Sci, 2017
Abstract The Mars Science Laboratory Mast camera and Descent Imager investigations were designed, built, and operated by Malin Space Science Systems of San Diego, CA. They share common electronics and focal plane designs but have different optics. There are two Mastcams of dissimilar focal length. The Mastcam‐34 has an f/8, 34 mm focal length lens, and
Malin MC, Ravine MA, Caplinger MA, Tony Ghaemi F, Schaffner JA, Maki JN, Bell JF, Cameron JF, Dietrich WE, Edgett KS, Edwards LJ, Garvin JB, Hallet B, Herkenhoff KE, Heydari E, Kah LC, Lemmon MT, Minitti ME, Olson TS, Parker TJ, Rowland SK, Schieber J, Sletten R, Sullivan RJ, Sumner DY, Aileen Yingst R, Duston BM, McNair S, Jensen EH.   +28 more
europepmc   +2 more sources

A Novel Companding Technique to Reduce High Peak to Average Power Ratio in OFDM Systems

IEEE Access, 2021
The reduction of the high peak-to-average-power ratio (PAPR) is important to the efficiency of the orthogonal frequency division multiplexing (OFDM) technique.
Abdulwahid Mohammed, Tawfik Ismail, Amin Nassar, Hassan Mostafa   +3 more
doaj   +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, Haitham F. Abdalla, Amira A. Mohamed, Emad S. Hassan, Moawad I. Dessouky, Ashraf A. M. Khalaf, Atef El‐Emary, Amir S. Elsafrawey   +7 more
wiley   +1 more source

A Simplified Scheme of Estimation and Cancellation of Companding Noise for Companded Multicarrier Transmission Systems [PDF]

, 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 ...
Jian, W., Peng, S., Shen, Y., You, J., Yuan, Z.   +4 more
core   +4 more sources