Cooperative communication and routing over fading channels in wireless sensor networks

The dense deployments of wireless sensor networks offer the opportunity to develop novel communication techniques based on multi-node cooperation that can perform efficiently even over harsh fading channels. Several key contributions in the development and analysis of such techniques are provided. First, prior studies on cooperative communication and routing are extended by explicitly considering fading channels and relaxing synchronization requirements. It is demonstrated that significant asymptotic spatial diversity gains are achievable with K-cooperation even if error propagation is considered. Second, we provide a low complexity near-optimal power distribution algorithm over cooperating nodes, which selects the number of cooperating transmitters based on observed channel conditions, and several power distribution strategies over links are compared. Finally, it is shown that multi-hop cooperative routing can be highly energy efficient in realistic settings.

[1]  Matthew C. Valenti,et al.  Exploiting macrodiversity in dense multihop networks and relay channels , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[2]  Anna Scaglione,et al.  Power optimal routing in wireless networks , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[3]  A. Khandani.  Cooperative Routing in Wireless Networks ∗ , 2003 .

[4]  Urbashi Mitra,et al.  Exploiting Diversity in Ad Hoc Sensor Networks , 2004 .

[5]  Ahmed Helmy,et al.  Energy-efficient forwarding strategies for geographic routing in lossy wireless sensor networks , 2004, SenSys '04.

[6]  Peter Larsson.  Selection diversity forwarding in a multihop packet radio network with fading channel and capture , 2001, MOCO.

[7]  Man Hon Cheung,et al.  Cooperative Routing in UWB Wireless Networks , 2007, 2007 IEEE Wireless Communications and Networking Conference.

[8]  Martin Haenggi,et al.  Energy-balancing strategies for wireless sensor networks , 2003, Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03..

[9]  Robert Tappan Morris,et al.  Opportunistic routing in multi-hop wireless networks , 2004, Comput. Commun. Rev..

[10]  David E. Culler,et al.  Taming the underlying challenges of reliable multihop routing in sensor networks , 2003, SenSys '03.

[11]  John G. Proakis,et al.  Digital Communications , 1983 .

[12]  Martin Haenggi,et al.  On the optimum number of hops in linear wireless networks , 2004, Information Theory Workshop.