Relaying strategies for cooperative networks with minimal node communications

Authors:
Lu Zhang;Leonard J. Cimini, Jr.;Lin Dai;Xiang-Gen Xia
Affiliations:
Department of Electrical and Computer Engineering, University of Delaware, Newark, DE;Department of Electrical and Computer Engineering, University of Delaware, Newark, DE;Department of Electrical and Computer Engineering, University of Delaware, Newark, DE;Department of Electrical and Computer Engineering, University of Delaware, Newark, DE
Venue:
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Year:
2006

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Abstract

Distributed space-time-block-coding (Dis-STBC) achieves diversity through cooperative transmission among geographically dispersed nodes. In this paper, we evaluate the performance of several decentralized Dis-STBC schemes in a selective decode-and-forward two-stage relaying network. In particular, we consider schemes without a central control unit or internode communications. These include a pre-assignment strategy and two randomized transmission techniques. The average diversity order of these techniques is considered, and the outage performance is presented under realistic channel conditions. It is found that although the randomized Dis-STBC has the best average diversity order, the performance difference of these schemes is negligible under more realistic scenarios. In addition, the effect of the power distribution between stages and between nodes is evaluated.