1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota
2Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas
A major design challenge in wireless sensor networks (WSNs) is the hard energy constraint. Since sensors have only small-size batteries whose replacement is costly if not impossible, sensor network operations must be energy efficient in order to prolong network lifespan . In fact, a main objective of current sensor network research is to design energy-efficient devices and algorithms to support various aspects of network operations. The μAMPs project  at MIT and the PicoRadio project  at Berkeley focus on energy-constrained radios and their impact on ultra-low-power sensing and networking. Various energy-efficient algorithms have been proposed for network coverage , data gathering , and protocols of medium access control  and routing  (see also the survey work  and the references therein). These research activities focus on collaborative strategies and cross-layer designs for distributed data collection, processing, and communication in an energy-efficient manner.
In this chapter we focus on energy-efficient distributed estimation in WSNs. The distributed ...