Title :
Distortion minimization via multiple sensors under energy harvesting constraints
Author :
Limmanee, Apirath ; Dey, Shuvashis ; Ahlen, Anders
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Melbourne, Melbourne, VIC, Australia
Abstract :
We consider a wireless sensor network equipped with energy harvesting technology. It contains M sensors that observe a random process and transmit an amplified uncoded analog version of the observed signal through fading wireless channels to a remote station. The remote station, often called the fusion center, estimates the realization of the random process by using a best linear unbiased estimator. In this paper, we consider the optimal energy allocation policy that minimizes total distortion over a finite time horizon subject to energy harvesting constraints at the sensors. We focus on two types of available side information at the sensor, i.e. (1) causal side information involving the present and previous channel states and the previous values of the harvested energy and (2) full (non-causal) side information, under both finite and infinite energy storage capacity at each sensor´s battery. The derivations and some structural properties of the optimal energy allocation schemes are discussed, and numerical results presented.
Keywords :
distortion; energy harvesting; fading channels; random processes; telecommunication power management; wireless sensor networks; M sensors; amplified uncoded analog version; distortion minimization; energy harvesting constraints; energy harvesting technology; fading wireless channels; finite time horizon; fusion center; infinite energy storage capacity; linear unbiased estimator; noncausal side information; optimal energy allocation policy; random process; remote station; wireless sensor network; Batteries; Energy harvesting; Resource management; Sensors; Silicon; Wireless communication; Wireless sensor networks;
Conference_Titel :
Signal Processing Advances in Wireless Communications (SPAWC), 2013 IEEE 14th Workshop on
Conference_Location :
Darmstadt
DOI :
10.1109/SPAWC.2013.6612045