Results 61 to 70 of about 22,406 (266)
Mixed-Signal Parallel Compressive Spectrum Sensing for Cognitive Radios
International Journal of Digital Multimedia Broadcasting, 2010 Wideband spectrum sensing for cognitive radios requires very demanding analog-to-digital conversion (ADC) speed and dynamic range. In this paper, a mixed-signal parallel compressive sensing architecture is developed to realize wideband spectrum sensing ...
Zhuizhuan Yu +5 more
doaj +1 more source
AI-Enabled Compressive Spectrum Classification for Wideband Radios
Technologies, 2023 Cognitive radio is a promising technology that emerged as a potential solution to the spectrum shortage problem by enabling opportunistic spectrum access.
Tassadaq Nawaz +1 more
doaj +1 more source
Sub-Nyquist Sampling: Bridging Theory and Practice [PDF]
, 2011 Sampling theory encompasses all aspects related to the conversion of continuous-time signals to discrete streams of numbers. The famous Shannon-Nyquist theorem has become a landmark in the development of digital signal processing. In modern applications,
Eldar, Yonina C., Mishali, Moshe
core +1 more source
Double Helical Plasmonic Antennas
Advanced Functional Materials, EarlyView.Plasmonic double helical antennas funnel circularly polarized light to the nanoscale, offering strong chiroptical interaction and directional light emission. Extending a single helix design tool, this study combines numerical modeling with experimental validation, revealing large, broadband dissymmetry factors in the visible range.
Aleksei Tsarapkin +7 more
wiley +1 more source
Wideband Sequential Spectrum Sensing with Varying Thresholds [PDF]
2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010 In this contribution, time varying threshold sequential detectors are employed for energy detection-based spectrum sensing in low- SNR regimes. Sequential detection is proven to be faster (on average) than any other multi-sample detector for a set of given probabilities of detection and false-alarm.
Kasra Haghighi +2 more
openaire +1 more source
Advanced Functional Materials, EarlyView.This study highlights the importance of accounting for stoichiometric hydrogen produced when utilizing Si photocatalysts. The stoichiometric contribution is sacrificial reagent dependent and decreases with increasing sterics around the catalyst surface.
Sarrah H. Putwa +4 more
wiley +1 more source
Wide-band planar inverted-F antenna for cognitive radio [PDF]
, 2009 A wide-band Planar Inverted-F Antenna (PIFA) is presented. The proposed antenna is simply structured consist of main patch supported by shorting wall and shorting pin, fed by 50 ohm microstrip transmission line. The antenna achieves an enhanced impedance
AbuTarboush, HF +3 more
core
Spatial-Spectral Joint Detection for Wideband Spectrum Sensing in Cognitive Radio Networks
, 2008 Spectrum sensing is an essential functionality that enables cognitive radios to detect spectral holes and opportunistically use under-utilized frequency bands without causing harmful interference to primary networks.
Cui, Shuguang +3 more
core +2 more sources
Positive‐Tone Nanolithography of Antimony Trisulfide with Femtosecond Laser Wet‐Etching
Advanced Functional Materials, EarlyView.A butyldithiocarbamic acid (BDCA) etchant is used to fabricate various micro‐ and nanoscale structures on amorphous antimony trisulfide (a‐Sb2S3) thin film via femtosecond laser etching. Numerical analysis and experimental results elucidate the patterning mechanism on gold (reflective) and quartz (transmissive) substrates.
Abhrodeep Dey +12 more
wiley +1 more source
Compressive Identification of Active OFDM Subcarriers in Presence of Timing Offset
, 2015 In this paper we study the problem of identifying active subcarriers in an OFDM signal from compressive measurements sampled at sub-Nyquist rate. The problem is of importance in Cognitive Radio systems when secondary users (SUs) are looking for available
Cabric, Danijela +2 more
core +1 more source