Results 71 to 80 of about 14,247 (230)

A wireless multimedia system [PDF]

open access: yes, 1995
The complexity, robustness, image and speech quality as well as packet multiplexing issues of a reconfigurable multi-media mobile communicator are addressed.
Steele, R.   +3 more
core  

Featured Cover

open access: yesAging Cell, Volume 25, Issue 6, June 2026.
Cover legend: The cover image is based on the article The MICOS Complex Regulates Mitochondrial Structure and Oxidative Stress During Age‐Dependent Structural Deficits in the Kidney by Prasanna Katti et al., https://doi.org/10.1111/acel.70534.
Prasanna Katti   +48 more
wiley   +1 more source

Upper-Bound Performance of a Wide-Band Adaptive Modem [PDF]

open access: yes, 1999
Adaptive modulation is applied in conjunction with a decision-feedback equalizer (DFE) in order to mitigate the effects of the slowly varying wide-band multipath Rayleigh fading channel in a noise-limited environment.
Wong, C.H., Hanzo, L.
core  

Adaptively Loaded IM/DD Offset-QAM OFDM Based on Set-Partitioned QAM Formats [PDF]

open access: yes, 2017
We propose an adaptive-loading algorithm for SP-QAM formats, and experimentally show that SP-offset-QAM outperforms conventional offset-QAM and conventional SP-QAM, in adaptive-loaded IM/DD OFDM systems, and achieves >40 Gbit/s at 50 km without any guard
Jian Zhao   +3 more
core   +1 more source

Symbol‐Level GRAND‐Assisted Detection for Polar‐Coded Spatial Modulation in MIMO Systems

open access: yesInternational Journal of Communication Systems, Volume 39, Issue 7, 10 May 2026.
This research presents an integrated polar‐coded spatial modulation (PCSM) transceiver scheme for MIMO transmission over Rayleigh fading channels. The proposed architecture employs linear spatial signal processing for antenna and symbol estimation, followed by symbol‐level guessing random additive noise decoding (symbol‐level GRAND)–assisted detection ...
Abhilasha Gautam   +2 more
wiley   +1 more source

Rake Receiver Detection of Adaptive Modulation Aided CDMA over Frequency Selective Channels [PDF]

open access: yes, 2001
A closed form Bit Error Ratio (BER) formula is derived for a fixed-mode Quadrature Amplitude Modulation (QAM) scheme employing Rake receivers and receiver antenna diversity.
Choi, B.J., Hanzo, L.
core  

Hexagonal QAM-Based Four-Dimensional AMO-OFDM for Spectrally Efficient Optical Access Network Transmission

open access: yesIEEE Access, 2019
A novel spectrally efficient optical transmission in a passive optical network (PON) with hexagonal quadrature amplitude modulation (QAM)-based adaptive modulated optical (AMO) orthogonal frequency division multiplexing (OFDM) is proposed and ...
Hyoung Joon Park   +3 more
doaj   +1 more source

Tunable Structural, Electronic, Optical, and Mechanical Properties of Ca3PBrxI3‐X (X = 0, 1, 2, and 3) Cubic Perovskites Via Iodine Incorporation: A First‐Principles Study

open access: yesNano Select, Volume 7, Issue 5, May 2026.
ABSTRACT First‐principles calculations with density functional theory are used to study the structural, electronic, and optical properties of Ca3PBrxI3‐x (x = 0, 1, 2, and 3) using both GGA‐PBE functionals with and without the Spin‐orbit coupling effect.
I. K. Gusral Ghosh Apurba   +7 more
wiley   +1 more source

Dual-Mode Vector-Quantised Low-Rate Cordless Videophone Systems for Indoors and Outdoors Applications [PDF]

open access: yes, 1997
Dual-mode reconfigurable wireless videophone transceivers are proposed for noise-, rather than interference-limited indoors and outdoors applications and their video quality, bit rate, robustness, and complexity issues are analyzed. A suite of fixed, but
Streit, J, Hanzo, L
core  

Defence traits vary across leaf ages in the thistles (Cardueae)

open access: yesFunctional Ecology, Volume 40, Issue 5, Page 1517-1531, May 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plants produce a variety of structural and chemical defences to deter herbivores, which can covary across every scale of biological organization. Along these lines, it has been suggested that young leaves differ from old leaves in their defence strategies, but studies ...
Miranda A. Sinnott‐Armstrong   +9 more
wiley   +1 more source

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