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In cooperative networks, transmitting and receiving nodes recruit neighboring nodes to assist in communication. We model a cooperative transmission link in wireless networks as a transmitter cluster and a receiver cluster. We then propose a cooperative communication protocol for establishment of these clusters and for cooperative transmission of data. We derive the upper bound of the capacity of the...
Wireless sensor networks demand the implementation of energy-aware transmission protocols. Recently, cooperative protocols have been suggested for use in sensor networks since they typically require less transmit power than the direct transmission for the same error probability. For sensor networks with short range transmissions, however, the energy consumed in receiving transmissions from cooperative...
The relay selection problem in a large wireless sensor network (WSN) with uniformly distributed identical nodes is investigated for a two-phase cooperative protocol where the signal transmitted from a single source is overheard by the network and is then relayed by multiple selected nodes subject to a total average transmission power. First, a relay selection technique is considered that maximizes...
This paper analyzes the use of link quality, based on the signal to noise ratio, as a metric to improve routing in multi-hop wireless networks. We compare the behavior and performance with those of other approaches, namely a simple minimum-hop selection process, as well as the expected transmission count (ETX) metric, which has recently gathered relevant attention from the scientific community. We...
Geographic routing is a promising solution for data forwarding in power-constrained ad-hoc networks. Such protocols are especially attractive for wireless sensor networks as they can be operated without a central control and are scalable to an arbitrary number of nodes. In this work, we present a class of geographic routing algorithms that enhance energy-efficiency by means of a cross-layer design...
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