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This paper analyzes a broadcasting technique for wireless multi-hop sensor networks that uses a form of cooperative diversity called Opportunistic Large Arrays (OLAs). They propose a method for autonomous scheduling of the nodes, which limits the nodes that relay and saves as much as 32% of the transmit energy compared to other broadcast approaches, without requiring Global Positioning System (GPS), individual node addressing, or inter-node interaction. This energy-saving is a result of cross-layer interaction, in the sense that the Medium Access Control (MAC) and routing functions are partially executed in the PHYsical (PHY) layer.
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