A Framework for distributed spatio-temporal communications in mobile ad hoc networks
Erçetin, Özgür and Jakllari, Gentian and Krishnamurthy, Srikanth V. and Faloutsos, Michalis and Krishnamurthy, Prashant V. (2006) A Framework for distributed spatio-temporal communications in mobile ad hoc networks. In: 9th IEEE Global Internet Symposium 2006, In Conjunction with IEEE INFOCOM 2006 Barcelona, Spain, 28 & 29 April 2006, Barcelona
Space-time communications can help combat fading and hence can significantly increase the capacity of ad hoc networks. Cooperative diversity or virtual antenna arrays facilitate spatio-temporal communications without actually requiring the deployment of physical antenna arrays. Virtual MISO entails the simultaneous transmission of appropriately encoded information by multiple nodes to effectively emulate a transmission on an antenna array. We present a novel multi-layer approach for exploiting virtual MISO links in ad hoc networks. The approach spans the physical, medium access control and routing layers and provides: (a) a significant improvement in the end-to-end performance in terms of throughput and delay and, (b) robustness to mobility and interference induced link failures. The key physical layer property that we exploit is an increased transmission range due to achieved the diversity gain. Except for space-time signal processing capabilities, our design does not require any additional hardware. We perform extensive simulations to quantify the benefits of our approach using virtual MISO links. As compared to using only SISO links, we achieve an increase of up to 150% in terms of the end-to-end throughput and a decrease of up to 75% in the incurred end-to-end delay. Our results also demonstrate a reduction in the route discovery attempts due to link failures by up to 60%, a direct consequence of the robustness that our approach provides to link failures.
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