Determination of the Optimal Receive Energy Gain of MME to ME coding for Wireless Sensor Networks

Abstract

– Wireless sensor networks (WSNs) are composed of numerous battery limited sensor nodes communicating wirelessly. Since replacing or recharging batteries of the nodes is hard for most of the applications, energy efficiency is crucial importance parameter for WSN design. There are many studies including protocols and coding schemes about energy efficiency of WSNs in the literature. Thanks to its simplicity, On-Off Keying (OOK) is one of the most preferred modulation types for WSNs. Minimum Energy (ME) coding scheme is proposed in order to improve energy efficiency of OOK transmitter. When ME coding is employed with OOK modulation, its aim is to reduce energy consumption in digital transmitters. MME coding scheme is a variant of the ME coding. It aims at reducing energy consumption further with sleep policies at the receiver. ME and MME coding schemes have similar bit error probabilities, but MME outperforms ME only in the case of low data rate and large codewords. In this study, an analytical expression is derived for the optimal value of receive energy gain for MME to ME coding in WSNs.