Spoofing Uplink Spatial Multiplexing With Diverse Spectrum
IEEE Transactions on Cognitive Communications and Networking, 2017 While 802.11 access points (APs) can have as many as eight antennas, form factor constraints often limit mobile clients to a single antenna, thereby precluding spatial multiplexing. In this paper, we design, implement, and experimentally evaluate diverse spectrum spatial multiplexing (DSSM), the first system to enable 802.11 standard-compliant uplink ...
Adriana B. Flores, Edward W. Knightly
openaire +1 more source
Self-trapping of optical beams in photorefractive media [PDF]
, 1993 We study the possibility of self-trapping of an optical beam in a photorefractive medium under the combined influence of diffraction and self-scattering (two-wave mixing) of its spatial frequency components.
Crosignani, Bruno +5 more
core +1 more source
Cooperative spectrum sharing protocol using spatial modulation
IET Communications, 2017 In this study, a new cooperative spectrum sharing protocol based on overlay system paradigm is proposed for different relaying strategies. In the considered model, a single‐antenna primary transmitter (PT) communicates with a primary receiver (PR) by the assistance of a secondary transmitter (ST) which seeks an opportunity to ...
Seda Üstünbaş +2 more
openaire +2 more sources
Hydrogen atom in space with a compactified extra dimension and potential defined by Gauss' law [PDF]
, 2014 We investigate the consequences of one extra spatial dimension for the stability and energy spectrum of the non-relativistic hydrogen atom with a potential defined by Gauss' law, i.e. proportional to $1/|x|^2$.
Bureš, Martin, Siegl, Petr
core +3 more sources
Tunability of terahertz random lasers with temperature based on superconducting materials [PDF]
, 2012 We theoretically demonstrate the tunabiltiy of terahertz random lasers composed of high temperature superconductorYBCO and ruby layers as active medium. The considered system is a one-dimensional disordered medium made of ruby grain and YBCO.
Ghasempour Ardakani, Abbas +3 more
core +1 more source
Spatial spectrum based blind spectrum sensing for multi-antenna cognitive radio system
Tongxin xuebao, 2015 State-of-the-art sensing methods only exploit three dimensions of the spectrum space:frequency，time and space whereas the angle dimension has not been exploited well enough for opportunistic spectrum access.Motivated by this，the authors apply angle of ...
Chang LIU +5 more
doaj +2 more sources
Beam-space spatial spectrum reconstruction under unknown stationary near-field interference: Algorithm design and experimental verification [PDF]
JASA Express LettersIn acoustic array signal processing, spatial spectrum estimation and the corresponding direction-of-arrival estimation are sometimes affected by stationary near-field interferences, presenting a considerable challenge for the target detection. To address
Jichen Chu, Lei Cheng, Wen Xu
doaj +1 more source
Exact solution of the two-dimensional Dirac oscillator
, 1993 In the present article we have found the complete energy spectrum and the corresponding eigenfunctions of the Dirac oscillator in two spatial dimensions.
C. R. Hagen +7 more
core +1 more source
Spatial Spectrum Reuse for Opportunistic Spectrum Access in Infrastructure-Based Systems
Wireless Personal Communications, 2012 Opportunistic spectrum access (OSA) receives a constantly growing interest due to its potential to mitigate spectrum scarcity and meet the increasing communication needs of mobile users. OSA refers to identifying and exploiting spatiotemporal unused portions of licensed spectrum to allow communication among unlicensed---secondary users (SUs) without ...
Tsolkas, D., Passas, N., Merakos, L.
openaire +2 more sources
Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM
FEBS Letters, EarlyView.Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley +1 more source