Issue No. 03 - March (2008 vol. 7)
In multihop wireless networks, the variability of channels results in some paths providing better performance than other paths. While it is well known that some paths are better than others, a significant number of routing protocols do not focus on utilizing optimal paths. However, cooperative diversity, an area of recent interest, provides techniques to efficiently exploit path and channel diversity. This paper examines the potential performance improvements offered by path diversity. Three settings are examined, namely, where the path loss and channel correlation are neglected, where path loss is considered, but channel correlation is neglected, and where path loss and channel correlation are both accounted for. It is shown that by exploiting path diversity, dramatic improvements in the performance may be achieved. Furthermore, in some settings, if the link statistics are held constant, then when path diversity is exploited, the performance improves with path length. This implies that if sufficient path diversity exists, then paths with more hops tend to support higher bit-rates than paths with fewer hops. It is shown that such behavior occurs when a particular map has a non-zero fixed point.
Wireless communication, Routing protocols, Network communications
S. Bohacek, "Performance Improvements Provided by Route Diversity in Multihop Wireless Networks," in IEEE Transactions on Mobile Computing, vol. 7, no. , pp. 372-384, 2007.