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» Multiuser Intelligent M-learning Environment
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TWC
2010
13 years 13 days ago
Adaptive linearly constrained minimum variance beamforming for multiuser cooperative relaying using the kalman filter
In this paper, we consider a wireless communication scenario with multiple source-destination pairs communicating through several cooperative amplify-and-forward relay terminals. T...
Amr El-Keyi, Benoît Champagne
AIED
2007
Springer
13 years 12 months ago
Situation Creator: A Pedagogical Agent Creating Learning Opportunities
In a multi-user, real-time, and situation-based learning environment, the availability of enough and appropriate situations is crucial for success. In order to improve effectivenes...
Yongwu Miao, Heinz Ulrich Hoppe, Niels Pinkwart
ATAL
2008
Springer
13 years 7 months ago
Simulation of sensor-based tracking in Second Life
This paper describes "Second Life" as a novel type of testbed and simulation environment for sensor-based applications. Second Life is a popular virtual online world tha...
Boris Brandherm, Sebastian Ullrich, Helmut Prendin...
TSP
2010
13 years 13 days ago
Uplink synchronization in OFDMA spectrum-sharing systems
Spectrum sharing employs dynamic allocation of frequency resources for a more efficient use of the radio spectrum. Despite its appealing features, this technology inevitably compli...
Luca Sanguinetti, Michele Morelli, H. Vincent Poor
TWC
2010
13 years 13 days ago
Primary User Enters the Game: Performance of Dynamic Spectrum Leasing in Cognitive Radio Networks
Dynamic spectrum leasing (DSL) is one of the schemes proposed for dynamic spectrum sharing (DSS) in cognitive radio networks. In DSL, spectrum owners, denoted as primary users, dyn...
Gonzalo Vazquez-Vilar, Carlos Mosquera, Sudharman ...