Experimental Results with a GPS and Signal Strength extended Ad Hoc Routing Protocol
LCN '03 Proceedings of the 28th Annual IEEE International Conference on Local Computer Networks
Link-level measurements from an 802.11b mesh network
Proceedings of the 2004 conference on Applications, technologies, architectures, and protocols for computer communications
Use of Frequency Diversity in Signal Strength based WLAN Location Determination Systems
LCN '07 Proceedings of the 32nd IEEE Conference on Local Computer Networks
Cognitive Radio: A Communications Engineering View
IEEE Wireless Communications
IEEE Transactions on Wireless Communications
Performance Evaluation of a Link Adaptation Technique for High Speed Wireless Communication Systems
IEEE Transactions on Wireless Communications
Cognitive networks: adaptation and learning to achieve end-to-end performance objectives
IEEE Communications Magazine
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
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The aggregation of Wi-Fi links has been identified as one way of taking advantage of available channels to achieve higher speed data transmission in future cognitive radio networks. However variations in link quality make it difficult to achieve stable performance from aggregated Wi-Fi links. In this paper we present a method for controlling aggregation of Wi-Fi links based on monitoring of link status. We first discuss the requirements for detecting bad-links which degrade the performance of aggregated Wi-Fi links. We then describe the implementation of an enhanced link-status detection algorithm based on monitoring of signal strength and number of retransmissions. In particular, we address the problems of monitoring and recovering links after they have been dropped from use, and adjusting decision thresholds to adapt to changing wireless conditions. Finally, we report the results of tests which demonstrate the effectiveness for attaining efficient aggregation of Wi-Fi links for high throughput under varying wireless conditions.