Bandwidth and routing optimization in wireless cellular networks with relays
WiOPT'09 Proceedings of the 7th international conference on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks
Cross-layer congestion control and scheduling in multi-hop OFDMA wireless networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Decentralized dynamic hop selection and power control in cognitive multi-hop relay systems
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
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We consider an optimal resource allocation strategy for cooperative relaying-enabled OFDMA multi-hop wireless networks. A cross-layer optimization problem is formulated that maximizes the balanced end-to-end throughput under the routing and the PHY/MAC constraints. A dual method is employed to solve the problem efficiently and optimally. A cooperative relaying technique is incorporated into the framework by introducing virtual links and nodes. Half-duplex operation of the radios is assumed, and mutual interference between the links is explicitly modeled to allow maximal spatial reuse of the spectral resources. Numerical results are provided to demonstrate how the bottleneck phenomenon typical in multi-hop networks can be alleviated by the proposed technique to yield significant improvement in the throughput.