Results 21 to 30 of about 1,153 (147)
Root-Based Nonlinear Companding Technique for Reducing PAPR of Precoded OFDM Signals
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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Non-Linear Companding Transform aided MIMO-OFDM Systems
IOSR Journal of Electronics and Communication Engineering, 2014 In this paper a new non-linear companding transform (NCT) technique based on inverse hyperbolic cosine function is proposed and implemented along with new Intercarrier interference reduction technique to improve the performance of Multi Input and Multi Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system in terms of Peak-to-Average ...
K. Srinivasa Rao, B. Prabakararao
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Walsh‐Hadamard‐transform‐based SC‐FDMA system using WARP hardware
ETRI Journal, 2021 Single‐carrier frequency division multiple access (SC‐FDMA) is currently being used in long‐term evolution uplink communications owing to its low peak‐to‐average power ratio (PAPR). This study proposes a new transceiver design for an SC‐FDMA system based
Shri Ramtej Kondamuri, Sundru Anuradha
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Research of Companding Transform Combines with Improving PTS
Procedia Engineering, 2011 AbstractThe orthogonal frequency division multiplexing uses as a high-speed information transmission technology, with excellent anti-interference capabilities, which also has its own shortcomings, such as high peak-to-average power ratio. In order to reduce hardware complexity and enhance the quality of transmission, there are methods about reducing ...
Zhi-dong, Xiao +2 more
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MC CDMA PAPR Reduction Techniques using Discrete Transforms and Companding
International Journal of Distributed and Parallel systems, 2011 18 pages,16 figures; International journal of Distributed and Parallel Systems volume 2, number 6, Novmber 2011,ISSN:0976 ...
Sarala, B., Venkateswarulu, D. S.
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Bit rates in audio source coding [PDF]
, 1992 The goal is to introduce and solve the audio coding optimization problem. Psychoacoustic results such as masking and excitation pattern models are combined with results from rate distortion theory to formulate the audio coding optimization problem.
Veldhuis, Raymond N.J.
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Non‐linear companding transform for DCO‐OFDM‐based VLC systems [PDF]
IET Communications, 2019 In this study, a novel non‐linear companding transform (NCT) is proposed for the DC‐biased optical orthogonal frequency division multiplexing (DCO‐OFDM) based visible light communications (VLC). The authors lower the peak‐to‐average power ratio (PAPR) of the original DCO‐OFDM signals to mitigate the transmission performance ...
Duqiang Xin +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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PTS and Companding Transform for PAPR Reduction in OFDM
International Journal of Computer Applications, 2013 A combined model of Partial Transmit Sequence (PTS) and a Companding Transform is proposed to reduce Peak-toAverage Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM). Simulation results demonstrate that the proposed scheme can substantially offer better PAPR reduction and BER performance.
Abhishek Sharma, Roopam Pawar
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Research on Compressed Multiscale Retinex Image Enhancement Algorithms
Journal of Harbin University of Science and Technology, 2020 The Retinex algorithm for face image illumination compensation and color restoration is an effective one in the traditional image enhancement algorithm under the condition of low illumination The traditional MSRCR algorithm can still produce some ...
LIU Mingzhu, SU Taoyu, WANG Yining
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