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By allowing neighboring nodes to effectively share their available resources, cooperative diversity-based protocols have shown improvements over the traditional routing and Medium Access Control (MAC) protocols. In this paper, the authors observe that while cooperative diversity-based protocols yield performance improvements in the presence of low-quality links, their performance improvements in the presence of high quality links is not significant. Although the neighboring resources are available regardless of link quality, cooperative protocols typically do not utilize the helper nodes when link quality is high (i.e., low error rate). Thus network resources remain under-utilized and performance is not maximized. In this paper, they propose the Opportunistic Virtual MISO (OVM) protocol for multi-hop wireless networks.
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