Results 111 to 120 of about 1,330,151 (239)

Serial Acquisition of DS-CDMA Signals in Multipath Fading Mobile Channels

open access: yes, 2001
This paper compares the mean acquisition time (MAT) performance of two serial search acquisition schemes over frequency-selective multipath Rayleigh fading channels.
Yang, L-L., Hanzo, L.
core   +1 more source

Spiropyran‐Crosslinked PDMS Optical Waveguides for Pressure Sensing and Visual Cue of Localized Pressure Threshold

open access: yesPolymers for Advanced Technologies, Volume 37, Issue 10, October 2026.
ABSTRACT Compliant optical waveguides are promising candidates for stress/strain sensing in soft robotics and personalized healthcare. While poly(dimethylsiloxane) (PDMS) offers a robust platform, enhancing sensitivity and integrating localized visual indicators for pressure threshold detection remains an active area of research.
Camila A. Zimmermann, Bora Ung
wiley   +1 more source

UAV-Assisted Network Coded Cooperation by Using Height-Dependency Shaping Parameters in Nakagami-m Faded Channel

open access: yesIEEE Access
In this paper, we propose a height-dependency shaping parameter ( $m$ ) and a height-dependency path-loss exponent for modelling small-scale Nakagami- $m$ fading and a large-scale path-loss model for unmanned aerial vehicle (UAV)-assisted network coded ...
Pankaj Kumar, Sudhan Majhi
doaj   +1 more source

Ultrasonic Vibration Assisted Laser Processing: A Hybrid Paradigm for Extreme Surface Enhancement

open access: yesRare Metals, Volume 45, Issue 10, October 2026.
ABSTRACT Traditional laser processing techniques offer many advantages, but they often encounter limitations such as heat‐affected zones, recast layers, residual tensile stresses, and poor surface finish. The integration of ultrasonic vibration (UV) presents a promising hybrid approach to overcome these challenges by introducing beneficial effects like
Aziz Ul Hassan Mohsan   +6 more
wiley   +1 more source

On the MIMO Channel Capacity of Multi-Dimensional Signal Sets

open access: yes, 2006
In this contribution we evaluate the capacity of Multi-Input Multi-Output (MIMO) systems using multi-dimensional PSK/QAM signal sets. It was shown that transmit diversity is capable of narrowing the gap between the capacity of the Rayleigh-fading channel
Ng, S. X., Hanzo, L.
core   +1 more source

Modification of the Madeira River morphology following large hydropower projects detected by satellite data

open access: yesRiver, Volume 5, Issue 3, Page 369-387, August 2026.
Abstract Estimating suspended sediment concentration (SSC) in river channels is essential for understanding hydro‐sedimentological processes, managing water quality, and conserving aquatic ecosystems. This study evaluated different empirical equations to estimate SSC in the lower Madeira River and analyzed its hydro‐sedimentary dynamics based on MODIS ...
Matheus Silveira de Queiroz   +5 more
wiley   +1 more source

A Reed-Solomon Coded DS-CDMA System Using Noncoherent M-ary Orthogonal Modulation over Multipath Fading Channels

open access: yes, 2000
The performance of Reed–Solomon (RS) coded direct-sequence code division multiple-access (DS-CDMA) systems using noncoherent M-ary orthogonal modulation is investigated over multipath Rayleigh fading channels.
Yang, L-L., Hanzo, L., Yen, K.
core   +1 more source

A Comparison Between Recursive Least-Squares (RLS) and Extended Recursive Least-Squares (E-RLS) for Tracking Multiple Fast Time Variation Rayleigh Fading Channel

open access: yesAl-Khawarizmi Engineering Journal, 2017
In order to select the optimal tracking of fast time variation of multipath fast time variation Rayleigh fading channel, this paper focuses on the recursive least-squares (RLS) and Extended recursive least-squares (E-RLS) algorithms and reaches the ...
Ali Salah Mahdi
doaj  

The Crystal Structures of High‐ and Low‐Temperature Silver Pyrophosphate: Structural Instability and Its Consequences

open access: yesZeitschrift für anorganische und allgemeine Chemie, Volume 652, Issue 15, 1 October 2026.
The crystal structures of the high‐temperature and low‐temperature phases of silver pyrophosphate are reported. The structural results are complemented by thermal analysis, vibrational and 31P‐MAS‐NMR spectroscopy studies, and density functional theory calculations.
Matthias Weil   +8 more
wiley   +1 more source

Pulse Shaping in MIMO COFDM over Rayleigh Fading Channels

open access: yes, 2009
In order to improve the performance of space-time coded(STC) multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) enhancements were implemented in a MatLab simulation by shaping the OFDM pulses transmitted through ...
Xiang, Wei   +3 more
core   +1 more source

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