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Collaborative relays achieve the benefits of spatial diversity without requiring any physical antenna arrays at wireless devices. While many studies have demonstrated its effectiveness in a single source-destination system, applying cooperative relays to large-scale wireless networks remains challenging. We show that a system with cooperative relays can be penalized by the extra level of interference it produces. By examining the inter-dependency between interference management and cooperative relay strategies, we model the penalty by an increase in spectrum resource usage, and translate it into a penalty of single-link performance. This penalty serves as a reference for cooperative relay design in a single-link scenario. We then present two practical spectrum allocation mechanisms for collaborative relay systems with different fairness and utilization tradeoffs. Simulation results confirm our analytically findings.
Wireless sensor networks, Network communications, Wireless communication

H. Zheng and Y. Zhu, "Understanding the Impact of Interference on Collaborative Relays," in IEEE Transactions on Mobile Computing, vol. 7, no. , pp. 724-736, 2007.
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