Results 51 to 60 of about 1,441 (173)

Companding technique for AM-SCM-PCMlightwave CATV systems

Electronics Letters, 1994
The companding technique has been shown theoretically to be effective for improving the fundamental CNR limit of AM-SCM-PCM lightwave CATV systems. For an 8 bit and 10 bit system, the improvement could be 3 and 4 dB, respectively, by use of erf-type companding, the corresponding CNR limits being raised to 44.8 and 56.8 dB, respectively.
Q. Pan, R.J. Green
openaire   +1 more source

A Novel Differential Log‐Companding Amplifier for Biosignal Sensing

Journal of Sensors, Volume 2016, Issue 1, 2016., 2016
We proposed a new method for designing the CMOS differential log‐companding amplifier which achieves significant improvements in linearity, common‐mode rejection ratio (CMRR), and output range. With the new nonlinear function used in the log‐companding technology, this proposed amplifier has a very small total harmonic distortion (THD) and ...
Zigang Dong, Xiaolin Zhou, Yuanting Zhang, Stephane Evoy   +3 more
wiley   +1 more source

Pre‐Flight and In‐Flight Calibration and Performance of the Terminal Tracking Cameras (TTCams) on the NASA Lucy Mission

Earth and Space Science, Volume 11, Issue 8, August 2024.
Abstract The Terminal Tracking Camera (TTCam) imaging system on the NASA Lucy Discovery mission consists of a pair of cameras that are being used mainly as a navigation and target acquisition system for the mission's asteroid encounters. However, a secondary science‐focused function of the TTCam system is to provide wide‐angle broadband images over a ...
Y. Zhao, J. F. Bell III, E. Sahr, E. Lessac‐Chenen, C. Adam, E. Cisneros, A. Winhold, M. Caplinger, M. Ravine, J. Schaffner, J. Shamah, S. Mottola   +11 more
wiley   +1 more source

Enhanced Next Generation Millimeter‐Wave Multicarrier System with Generalized Frequency Division Multiplexing

International Journal of Antennas and Propagation, Volume 2016, Issue 1, 2016., 2016
Orthogonal Frequency Division Multiplexing (OFDM) is a popular multicarrier technique used to attain high spectral efficiencies. It also has other advantages such as multipath tolerance and ease of implementation. However, OFDM based systems suffer from high Peak‐to‐Average Power Ratio (PAPR) problem. Because of the nonlinearity of the power amplifiers,
Hidekazu Shimodaira, Joongheon Kim, Ali S. Sadri, Imdad Khan   +3 more
wiley   +1 more source

Simplified technique for syllabic companding inlog-domain filters

Electronics Letters, 2000
It is shown that when syllabic companding is applied to log-domain filters using dynamic biasing, their large signal linearity can be exploited to eliminate the state variable compensation circuit. Owing to its simplicity, the proposed technique has several advantages over previous approaches.
N. Krishnapura, Y. Tsividis, D.R. Frey
openaire   +1 more source

Constrained RS coding for Low Peak to Average Power Ratio in FBMC - OQAM Systems [PDF]

Journal of Electrical and Electronics Engineering, 2019
Multi-carrier modulation techniques have now become a standard in many communication protocols. Filter bank based multi-carrier (FBMC) generation techniques have been discussed in the literature as a means for overcoming the shortcomings of IFFT/FFT ...
Job CHUNKATH, V.S. SHEEBA, Nisha VARGHESE   +2 more
doaj  

A Novel Companding-Based Hermitian Symmetry Free ACO-UFMC Scheme for IM/DD in Low-Power IoT-Centric Future Wireless Communications

IEEE Access
For optical communication, the transmitted signal must be real-valued that can be achieved by employing Hermitian symmetry (HS). But the HS results in increased power consumption and decreased spectral efficiency (SE). Therefore, a HS free asymmetrically
Vijaya Durga Chintala, Rani Deepika Balavendran Joseph, Subba Rao Suddapalli, Vinay K. Tiwari, Anuradha Sundru   +4 more
doaj   +1 more source

A Joint Linearization/Companding Approach for Improving a CO-OFDM Transmitter

, 2015
International audience—The joint use of peak-to-average power ratio (PAPR) reduction and linearization via digital predistortion is investigated in this letter, with the view to improve the performances of coherent optical OFDM (CO-OFDM) systems ...
Azou, Stéphane, Bejan, Serban, Diouf, Cherif, Morel, Pascal, Sharaiha, Ammar, Tanguy, Noël, Telescu, Mihai   +6 more
core   +3 more sources

An efficient hardware architecture for a neural network activation function generator [PDF]

, 2006
This paper proposes an efficient hardware architecture for a function generator suitable for an artificial neural network (ANN). A spline-based approximation function is designed that provides a good trade-off between accuracy and silicon area, whilst ...
B. Widrow, D. Zhang, D.J. Myers, G. Cauwenberghs, H. Amin, H. Faiedh, I. Koren, J. Holt, J. Pineiro, K. Basterretxea, M. Tommiska, S. Draghici, S. Haykins, S. Vassiliadis, U. Ruckert   +14 more
core   +1 more source

An Enhanced Companding Algorithm for Universal Filtered Multi-Carrier System

ETRI Journal
This paper proposes a new companding scheme called three μ-law compand-ing to reduce the peak-to-average power ratio (PAPR) in a universal filtered multicarrier system. The proposed scheme is more flexible and provides better PAPR reduction and bit error
Vijaya Durga Chintala, Shri Ramtej Kondamuri, Subba Rao Suddapalli, Anuradha Sundru   +3 more
doaj   +1 more source