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We consider a time-slotted two-hop wireless system in which the sourcestransmit to the relays in the even time slots (first hop) and the relaysforward the packets to the destinations in the odd time slots (second hop).Each source may connect to multiple relays in the first hop. In the presence ofinterference and without tight coordination of the relays, it is not clearwhich relays should transmit the packet. We propose four decentralized methodsof relay selection, some based on location information and others based on thereceived signal strength (RSS). We provide a complete analyticalcharacterization of these methods using tools from stochastic geometry. We usesimulation results to compare these methods in terms of end-to-end successprobability.

Analysis of Uncoordinated Opportunistic Two-Hop Wireless Ad Hoc Systems