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Response delay problem and measurements of such delays have been reported in Part I. The response delay has a negative impact on the accuracy of spectrum sensing, which is the cornerstone of cognitive radio. In this paper, single-user prediction of channel state is proposed to minimize the negative impact of response delays caused by hardware platforms. Specifically, a modified hidden Markov model...
Each positioning technology has its own weaknesses. Unlike open environments, where high location accuracy can be achieved, indoors settings pose a special challenge for location technologies. In this research several location technologies and positioning algorithms have been classified. Included are location estimation systems using WiFi Received Signal Strength Indicator (RSSI) values and positioning...
The 802.11 Wireless Standard defines methods for improving reliability and security on Wireless Local Area Networks (WLANs). Two methods that are especially desirable to enterprise networks are handoff and Remote Authentication Dial-In User Service (RADIUS). Handoff allows seamless mobility on a wireless network, thus providing users with the ability to roam among enterprise wireless access points...
Spectrum sensing detects the availability of the radio frequency spectrum and it is essential to cognitive radio. Cooperative spectrum sensing conducted among multiple secondary users has the potentials for solving the hidden terminal problem and achieving a better performance. In this paper, an approach for cooperative spectrum sensing based on Q-learning is proposed. Real-world Wi-Fi signals measured...
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