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Project Description People Publication Project Meeting Contact The CHARIoT network advances the idea that hybrid wireless networks can draw on the combined strengths of fixed and ad-hoc networks to create a vital architecture for the next generation Internet. Common to the various scenarios of hybrid networks are infrastructure nodes that act as relays for intra-network communications and as gateways for communications with external entities. Infrastructure nodes are typically connected to a powerful "backbone" with high capacity and low latency. Hybrid networks have been proposed in the literature for providing relief to the scalability problem of vanishing per node throughput in ad-hoc wireless networks. However, these studies have also shown that to restore scalable throughput, infrastructure nodes have to scale at the same rate as the user nodes, dooming this approach economically. When multiple users share the same link, wireless channels behave as "leaky pipes" interfering with each other. A totally new dimension is introduced by allowing nodes to cooperate. Cooperation among user or infrastructure nodes has the ability to convert "leaky channels" into high capacity multidimensional manifolds. A central question that CHARIoT seeks to answer is: Can cooperation among infrastructure nodes resolve the scalability problem of hybrid networks in the sense that in a cooperative regime, non-vanishing per node throughput is achievable even when the number of infrastructure nodes scales considerably slower than the number of user nodes? Faculty PhD student Amir Laufer
Book chapter O. Somekh, O. Simeone, Y. Bar-Ness, A. Haimovich, U. Spagnolini and S. Shamai, "An information theoretic view of distributed antenna processing in cellular systems," in "Distributed Antenna Systems: Open Architecture for Future Wireless Communications" to be published by Auerbach Publications, CRC Press (March 2007). [pre-print]
Journal
O. Simeone, O.
Somekh, Y. Bar-Ness and U. Spagnolini, "Uplink
throughput of TDMA cellular systems with multicell processing and
Amplify-and-Forward cooperation between mobiles," to appear on IEEE
Trans. Wireless Commun.
Conference O. Somekh, O. Simeone, V. Poor and S. Shamai, "Cellular systems with full-duplex Amplify-and-Forward relaying and cooperative base stations," in Proc. IEEE ISIT 2007. I. Stanojev, O. Simeone and Y. Bar-Ness, "'Optimal design of a multi-antenna access point with decentralized power control using game theory," in Proc. IEEE DySPAN 2007. S. Cui and A. Haimovich, "Opportunistic relaying in wireless networks," submitted to Allerton 2007. B. Niu, O. Simeone, O. Somekh and A. Haimovich, “Throughput of Two-Hop Wireless Networks with Relay Cooperation,” submitted to Allerton 2007. O. Somekh, O. Simeone, Y. Bar-Ness and A. Haimovich, "Distributed multi-cell zero-forcing beamforming in cellular downlink channels," in Proc. IEEE Globecom 2006. CHARIoT meeting (08/20/07) at Princeton University A. Haimovich: Perspectives on Chariot (short introduction) (screen presentation) O. Somekh: Wireless Systems with Limited Backhaul Capacity (screen presentation) O. Simeone: Throughput of cellular systems with conferencing mobiles and cooperative base-stations (screen presentation) Shengshan Cui: Opportunistic Relaying in Wireless Networks (screen presentation) Bo Niu: Throughput of Two-Hop Wireless Networks with Relay Cooperation (screen presentation)
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