In this paper, we present a novel design framework aimed at developing cooperative diversity in 802.11-based wireless sensor networks. The proposed scheme is a combination of a time-reversed Space-Time Block Code (TR STBC) scheme at the physical layer and a cooperative routing protocol at the network layer. The core feature of this architecture is that the multiple routes are capable of assisting the transmission of each other, hence the reliability of all the wireless links are enhanced simultaneously by cooperative diversity. This will involve the design of physical layer transmission schemes, medium access protocols and routing strategies. For the latter in particular, we present a cooperative routing protocol that is capable of exploiting full transmit diversity in wireless sensor networks. We restrict ourselves by imposing as few modifications to existing schemes as possible, so that integration to the existing infrastructure will be straightforward. Comprehensive simulations have been carried out to demonstrate the end-to-end performance of the proposed scheme. It is shown that a substantial gain can be achieved by cooperative diversity using a virtual MIMO system architecture.
Citation: IET Wireless Sensor Systems
Pub Type: Journals
Wireless sensor networks, cooperative diversity, cooperative routing, MIMO systems, STBC, IEEE 802.11