Results 51 to 60 of about 10,890,806 (175)

The Mars Science Laboratory Curiosity rover Mastcam instruments: Preflight and in‐flight calibration, validation, and data archiving

Earth and Space Science, Volume 4, Issue 7, Page 396-452, July 2017., 2017
Abstract The NASA Curiosity rover Mast Camera (Mastcam) system is a pair of fixed‐focal length, multispectral, color CCD imagers mounted ~2 m above the surface on the rover's remote sensing mast, along with associated electronics and an onboard calibration target.
J. F. Bell III, A. Godber, S. McNair, M. A. Caplinger, J. N. Maki, M. T. Lemmon, J. Van Beek, M. C. Malin, D. Wellington, K. M. Kinch, M. B. Madsen, C. Hardgrove, M. A. Ravine, E. Jensen, D. Harker, R. B. Anderson, K. E. Herkenhoff, R. V. Morris, E. Cisneros, R. G. Deen   +19 more
wiley   +1 more source

A Beyond 5G OTFS Waveform Radio for Smart Hospital: PAPR Reduction in OTFS Using the Cuckoo Search–Based PTS Method

Journal of Electrical and Computer Engineering, Volume 2025, Issue 1, 2025.
Smart hospitals have enormous potential to improve global standards of medical services. Integrating fifth‐generation (5G) and beyond 5G radio with the present healthcare framework can make hospitals smarter. High spectral access, data rate, capacity, low latency, and large data handling are requirements of innovative hospitals.
Arun Kumar, Aziz Nanthaamornphong, Shonak Bansal   +2 more
wiley   +1 more source

A PAPR correction scheme for LoRa self‐jamming waveforms

IET Communications, Volume 18, Issue 19, Page 1588-1603, December 2024.
A self‐jamming scheme of LoRa waveforms enabling secure transmissions is recently proposed in literature, which performs well in simulations. However, experiments on SDR equipment immediately showed that a transmission is impossible due to PAPR introduced by the waveform modification.
Clément Demeslay, Roland Gautier, Philippe Rostaing, Angela Digulescu, Cristina Despina‐Stoian, Gilles Burel   +5 more
wiley   +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

A Review of Partial Transmit Sequence for PAPR Reduction in the OFDM Systems

IEEE Access, 2019
Orthogonal frequency division multiplexing (OFDM) is a superior technology for the high-speed data rate of wire-line and wireless communication systems.
Yasir Amer Jawhar, Lukman Audah, Montadar Abas Taher, Khairun Nidzam Ramli, Nor Shahida Mohd Shah, Mustafa Musa, Mustafa Sami Ahmed   +6 more
doaj   +1 more source

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

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

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  

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   +1 more source

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