Results 31 to 40 of about 241 (175)
Journal of Cachexia, Sarcopenia and Muscle, Volume 11, Issue 5, Page 1291-1305, October 2020., 2020 Background Impaired muscle regeneration and increased muscle fibrosis are observed in aged muscle accompanied by progressive loss of muscle mass (sarcopenia). However, the underlying mechanism is still unclear. Methods The differentiated expressed genes in young and aged muscles after acute injury by cardiotoxin were identified by RNA‐sequence analysis.
Congcong Zhang +7 more
wiley +1 more source
Advances in Electrical and Computer Engineering, 2010 In this article DPCM (Differential Pulse Code Modulation) speech coding scheme with a simple switched first order predictor is presented. Adaptation of the quantizer to the signal variance is performed for each particular frame. Each frame is classified
VELIMIROVIC, L. +3 more
doaj +1 more source
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
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
doaj +1 more source
On companding techniques for PAPR reduction in DCT SC-FDMA system in the presence of CFOs
Alexandria Engineering Journal, 2023 In the single carrier frequency division multiple access (SC-FDMA) system, the use of discrete cosine transform (DCT) instead of discrete Fourier transform (DFT) has shown improved bit error rate (BER) performance.
Naim Ben Ali +5 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
Performance Analysis of the Two-Piecewise Linear Companding Technique on Filtered-OFDM Systems
IEEE Access, 2021 Filtered orthogonal frequency division multiplexing (F-OFDM) is one of the most prominent waveform candidates when it comes to fifth-generation (5G) wireless communication and beyond.
Mishal Al-Gharabally +2 more
doaj +1 more source
Conference on Lasers and Electro-Optics, 2018 We introduce a new nonlinear analog optical computing concept that compresses the signal's dynamic range and realizes non-uniform quantization that reshapes and improves the signal-to-noise ratio in the digital domain.
Jiang, Yunshan, Jalali, Bahram
openaire +2 more sources
CRLB for joint estimation of TDOA, phase, FDOA, and Doppler rate
The Journal of Engineering, Volume 2019, Issue 21, Page 7628-7631, November 2019., 2019 To avoid decline of FDOA estimation precision caused by relative Doppler companding, Doppler rate has to be considered and estimated jointly with TDOA, phase, and FDOA. However, CRLB of the joint estimation is still unclear. This study addresses on derivation of the CRLB. First, the joint estimation model is constructed.
Dexiu Hu +4 more
wiley +1 more source
Fast Non‐Uniform Quantisation via FP12 Demotion and Constant‐Time Predecessor Tables
Electronics Letters, Volume 62, Issue 1, January/December 2026.A practical constant time per query method for non‐uniform scalar quantisation with static and reused boundaries. Boundaries are demoted to an FP12 universe and indexed with a compact vEB‐style predecessor table, enabling constant‐time lookup independent of the number of bins.
Oswaldo Cadenas
wiley +1 more source