Cooperative Relaying in Wireless Networks under Spatially and Temporally Correlated Interference

摘要

We analyze the performance of an interference-limited, decode-and-forward,cooperative relaying system that comprises a source, a destination, and $N$relays, placed arbitrarily on the plane and suffering from interference by aset of interferers placed according to a spatial Poisson process. In eachtransmission attempt, first the transmitter sends a packet; subsequently, asingle one of the relays that received the packet correctly, if such a relayexists, retransmits it. We consider both selection combining and maximal ratiocombining at the destination, Rayleigh fading, and interferer mobility. We derive expressions for the probability that a single transmission attemptis successful, as well as for the distribution of the transmission attemptsuntil a packet is transmitted successfully. Results provide design guidelinesapplicable to a wide range of systems. Overall, the temporal and spatialcharacteristics of the interference play a significant role in shaping thesystem performance. Maximal ratio combining is only helpful when relays areclose to the destination; in harsh environments, having many relays isespecially helpful, and relay placement is critical; the performance improveswhen interferer mobility increases; and a tradeoff exists between energyefficiency and throughput.