Energy Consumption Improvement of OOK Transmitter Based on Minimum Energy Coding

Abstract Energy consumption of Wireless Sensor Networks (WSNs) including OOK transmitter is important for short range transmission and long battery life time requirements. In this paper, the Minimum Energy (ME) coding strategy is adopted to improve the energy efficiency of an OOK transmitter. We first give the energy consumption model based on a real OOK transmitter, which can completely switch off the transmitter during the transmission of low bit '0' and has an energy effciency of 52 pJ/bit. Based on this energy consumption model, ME-Coding provides an energy effciency of 30 pJ/bit for coding size k = 3. Moreover, larger coding size others more significant improvement, at the sacrifice of spectral effciency and transmission range. In this paper, we have also determined a closed-form solution for the optimal coding size for a given transmission range constraint.