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In this paper, we examine an hierarchical Software-Defined Radio (SDR) controlled Wireless Sensor Network (WSN) testbed built in our Wireless Communications Lab. In this testbed, an hierarchical cluster-based topology is employed to fulfill the needs of energy efficiency and scalability where a group of XBOW MicaZ Sensors/Motes in communication with a Universal Software Radio Peripheral (USRP2) forms...
Second generation ID card is the unique identity label of Chinese citizens. In the entrance guard system, using the second generation ID card instead of M1 card will simplify the entrance guard system and also the system will be more efficiently managed. When using the second generation ID card as the identification tag in the hotel entrance guard system, we should access the real-time transmission...
In this paper, we consider two uncoordinated and geographically overlapping Cognitive Radio (CR) networks coexisting together with Primary User (PU) networks. One of the CR networks, the Cognitive Gateway Network (CGN) has higher priority to access the spectrum than the other CR network. We study the achievable rates of both CR networks. The achievable data rate per-node is derived analytically considering...
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