Results 71 to 80 of about 7,335,937 (187)

Low-Complexity Reduced-Rank Adaptive Detection in Hybrid Direct-Sequence Time-Hopping Ultrawide Bandwidth Systems

, 2009
— In this contribution reduced-rank adaptive minimum mean-square error multiuser detector (MMSE-MUD) is proposed and investi-gated for the hybrid direct-sequence time-hopping ultrawide bandwidth (DS-TH UWB) systems.
Ahmed, Qasim, Lie-liang Yang, Yang, Lie-Liang, Qasim Zeeshan Ahmed   +3 more
core   +1 more source

Multiuser MIMO-OFDM Systems using Subcarrier Hopping

, 2006
Recently space division multiple access (SDMA) assisted multiple-input–multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems invoking multiuser detection (MUD) techniques have attracted substantial research interest, which is ...
Jiang, M, Hanzo, L
core   +1 more source

Improved LDPC-based short-range frequency-hopping wireless communication system

Tongxin xuebao, 2017
In short-range wireless communication system(SWCS)，the complex scenarios make its transmission face the diverse interference，and lower hardware resource leads to its limited anti-interference capability.To achieve the reliable transmission，a frequency ...
Wei-dong FANG, Wu-xiong ZHANG, Ming-ming HU, Wei CHEN, Yang YANG   +4 more
doaj   +2 more sources

Spectral Sensing of Adaptive Frequency Hopping Signal for Cognitive Radio

, 2008
The issue of dynamic spectrum scene analysis in any cognitive radio network becomes extremely complex when low probability of intercept, spread spectrum systems are present in environment.
Jaiswal, Kapil
core  

Intelligent frequency management in FANET: Fuzzy logic/routing and adaptive frequency hopping

The study aimed to experimentally evaluate the effectiveness of intelligent frequency management in swarm networks of unmanned aerial vehicles (UAVs) using fuzzy logic and adaptive frequency hopping.
V. Pavlysh, R. Zaivyi
core   +1 more source

Securing UAV Networks: A Lightweight Chaotic-Frequency Hopping Approach to Counter Jamming Attacks

IEEE Access
Drones, also known as unmanned aerial vehicles (UAVs), are becoming more and more widespread for a variety of uses, including delivery, inspection, and monitoring.
C. Atheeq, Zameer Gulzar, Mana Saleh Al Reshan, Hani Alshahrani, Adel Sulaiman, Asadullah Shaikh   +5 more
doaj   +1 more source

Construction method and performance analysis of chaotic frequency-hopping sequences based on Logistic-Sine-Cosine mapping

Tongxin xuebao
In order to solve the problems of low dimensional chaotic mapping, limited chaotic behavior, and discontinuous chaotic interval, a new construction method of chaotic frequency-hopping sequence was proposed.
CAO Chunjie, WANG Yinglin, SUN Yang, TAO Hongfei, YANG Haoning, SHI Jingcheng, DAI Junhao, SUN Jingzhang   +7 more
doaj  

Successive Interference Cancellation in Clipped and Product Combining aided FFH Multi-User Systems

, 2006
—In this contribution, we propose two successive interference cancellation (SIC) schemes for a fast frequency hopping (FFH) multiple access (MA) system using M-ary frequency shift keying (MFSK) and invoking multi-user detection (MUD). One of the proposed
Ahmed, S., Yang, L-L., Hanzo, L.
core   +1 more source

Multiuser Detection Assisted Time- and Frequency-Domain Spread Multicarrier Code-Division Multiple-Access

, 2006
In this contribution, we study a reduced-complexity multiuser detection aided multicarrier direct-sequence code-division multiple-access (MC DS-CDMA) scheme, which employs both time (T)-domain and frequency (F)-domain spreading.
Wei, H., Yang, L-L., Hanzo, L.
core   +1 more source

Heads on the surface: Peek performance of spy-hop behavior in Chilean dolphins. [PDF]

Ecology
Silvestri M, Swan GJF, Soto GE, Heinrich S, Soto-Gamboa M.   +4 more
europepmc   +1 more source