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This paper deals with a cooperative decoded relaying scheme in multihop wireless network and the corresponding transmitters power allocation strategies for nodes belonging to a single primary route towards a destination. The proposed transmission strategy is referred as multihop cooperative transmission chain (MCTC). The MCTC is based on the relays of the same message by multiple previous terminals along the route and on their linear combination at the receiver to maximize the multihop diversity. Power allocations among transmitting nodes in the route can be obtained according to the average (not instantaneous) node-to-node attenuation using a recursive power assignment that can be employed locally with minimal signalling exchange among nodes. In this paper the MCTC with selection combining strategy at receivers and power assignment that maximize the minimum spread of received power (min-max strategy) is able to better exploit the multihop diversity. In addition, for ad hoc network where the energy of each node is an issue, the MCTC considerably increases the network lifetime when compared to non-cooperative multihop schemes.
Date of Conference: 22-24 March 2006