Distributed space-frequency coding in broadband ad hoc networks

A distributed space-frequency (SF) coded cooperative technique is proposed for broadband wireless ad-hoe networks. By employing an SF coding at the source node and a circular shift at each relay node, the proposed cooperative diversity technique can exploit the maximum relay diversity and multipath diversity. Pairwise error probability analysis shows that the achievable diversity gain is min(ML1, ML2), where M is the number of the relay nodes, and L-1 and L-2 are the number of taps of the multipath fading channels from the source node to the relay nodes and from the relay nodes to the destination node, respectively