Results 41 to 50 of about 106,474 (328)
Vandermonde-subspace Frequency Division Multiplexing for Two-Tiered Cognitive Radio Networks [PDF]
, 2013 Vandermonde-subspace frequency division multiplexing (VFDM) is an overlay spectrum sharing technique for cognitive radio. VFDM makes use of a precoder based on a Vandermonde structure to transmit information over a secondary system, while keeping an ...
Cardoso, Leonardo S. +3 more
core +3 more sources
Orthogonal Frequency Division Multiplexing With Joint Subblocks Index Modulation
IEEE Access, 2019 Recently, orthogonal frequency division multiplexing (OFDM) with index modulation has emerged as promising technologies with the improvement of spectral efficiency and energy efficiency, which carries additional index bits through the index domain.
Yuxin Shi +4 more
doaj +1 more source
International Journal of Satellite Communications and Networking, EarlyView., 2023 The performance limitation in multiple‐input multiple‐output (MIMO) feeder links due to time and phase misalignment of the ground stations is investigated. Time and phase distribution over optical fiber is considered as an approach to achieve the synchronization requirements.
Eriserdi Mollaymeri +2 more
wiley +1 more source
Blind Joint Soft-Detection Assisted Slow Frequency-Hopping Multicarrier DS-CDMA [PDF]
, 2000 A novel multiple-access scheme based on slow frequency-hopping multicarrier direct-sequence, code-division multiple access (SFH/MC DS-CDMA) is proposed and investigated, which can be rendered compatible with the existing second-generation narrow-band ...
Hanzo, L., Yang, L-L.
core +1 more source
Orthogonal Frequency Division Multiplexing Timing Synchronization in Multi-Band Orthogonal Frequency Division Multiplexing Ultra-Wideband Systems [PDF]
American Journal of Applied Sciences, 2010 Problem statement: MB-OFDM UWB systems have attractive features and received a great attention. It has the capability of sending/receiving data at rates in access of 100 Mbits sec-1. Owing to the sensitivity of OFDM systems to synchronization errors, a fast synchronization algorithm is required to discern for the start of OFDM symbol.
Aymen M. Karim +2 more
openaire +2 more sources
Orthogonal frequency division multiplexing with power distribution index modulation [PDF]
Electronics Letters, 2020 Orthogonal frequency division multiplexing with index modulation (OFDM‐IM) is a promising multicarrier transmission technique that exploits both conventional modulation and the indices of active subcarriers for data transmission. In this Letter, the authors propose OFDM with power distribution index modulation (OFDM‐PIM) where a unique power ...
A.T. Dogukan, E. Basar
openaire +5 more sources
Advanced Functional Materials, EarlyView.Epitaxial piezoelectric α‐quartz/Si BioNEMS sensors, made using soft chemistry, effectively detect the Chikungunya virus. They have a mass sensitivity of 205 pg Hz−1 in liquid and can detect the virus at a limit of 9 ng mL−1. This development enables high‐frequency mass devices for point‐of‐care testing in healthcare and other electronic applications ...
Raissa Rathar +12 more
wiley +1 more source
Performance analysis of modified asymmetrically-clipped optical orthogonal frequency-division multiplexing systems [PDF]
, 2016 A modification to the Asymmetrically-Clipped Optical Orthogonal Frequency-Division Multiplexing (ACO-OFDM) technique is proposed through unipolar encoding.
Andonovic, Ivan +3 more
core +1 more source
Advanced Healthcare Materials, EarlyView.Membrane fusion‐inspired nanomaterials offer transformative potential in diagnostics by mimicking natural fusion processes to achieve highly sensitive and specific detection of disease biomarkers. This review highlights recent advancements in nanomaterial functionalization strategies, signal amplification systems, and stimuli‐responsive fusion designs,
Sojeong Lee +9 more
wiley +1 more source
Downlink Precoding for Massive MIMO Systems Exploiting Virtual Channel Model Sparsity
, 2017 In this paper, the problem of designing a forward link linear precoder for Massive Multiple-Input Multiple-Output (MIMO) systems in conjunction with Quadrature Amplitude Modulation (QAM) is addressed.
Ayanoglu, Ender, Ketseoglou, Thomas
core +1 more source