Speaker: Neevan
Title: Virtual MIMO channels in cooperative multihop wireless sensor networks.
Authors: Aitor del Coso, Stefano Savazzi, Umberto Spagnolini and Christian Ibars.

Abstract: we analyze the performance of virtual multiple-input-multiple-output
(MIMO) channels for multi-hop transmission in wireless sensor networks. First,
we propose a clustered network topology with sensor nodes grouped in
collaborative sets attending to proximity. Then, we propose that all nodes
belonging to any given cluster cooperatively transmit and receive data from
other clusters, exploiting the diversity advantages of cluster-to-cluster
Virtual MIMO channels. In order to construct the cooperative transmission, we
arrange each hop into two consecutive time slots: the Intracluster Slot, that
accounts for data sharing within the cluster, and the Intercluster Slot
for transmission between clusters; and we devise a cooperative reception
protocol within the clusters based upon a simplified selection diversity
algorithm. Optimum time assignment and power allocation for both slots are
derived taking the cluster-to-cluster probability of outage as the metric.
Results for one hop networks and for multi-hop networks are obtained, showing
substantial diversity gains and energy savings. Furthermore, results show that
the performance of the proposed virtual MIMO channels is equal to that of real
MIMO channels but for a small SNR loss.