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The cognitive capability of secondary users in multichannel wireless networks enables the functionalities of system parameter estimation and learning, so that a more intelligent channel access without interfering the primary users is possible. This paper proposes a novel cognitive channel access algorithm with threshold policy on the basis of a continuous-time Markov chain built by the estimated parameters...
Machine-to-Machine communication recently becomes a popular issue in 4G Standardization Committee, such as IEEE 802.16p and LTE-A. In an OFDMA cellular network embedded with a M2M system, the energy consumption (EC) minimization problem is formulated with the consideration of transmission and circuit energy consumed. We propose joint massive access control and resource allocation (RA) schemes, which...
The ongoing development of wireless sensor networks (WSNs) demands not only low-power sensors and less system cost but also good performance. Considering this background, investigating a new technology to satisfy both requirements is an important issue for current development of wireless sensor network systems. In this paper, we consider the situation that the sensor nodes in WSNs are deployed in...
Mobile WiMAX, based on IEEE 802.16e, has been developed and is expected to be commercialized in late 2008 or early 2009. To further improve the system performance, spatial division multiple access (SDMA) enabled by adaptive antenna system (AAS) has been considered. In this paper, the relative performance improvement of SDMA based mobile WiMAX is investigated. Results show that AAS-enabled SDMA can...
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