The field of information and communication technologies continues to evolve and grow in both the research and the practical domains. However, energy efficiency is an aspect in communication technologies that until recently was only considered for embedded, mobile or handheld battery constraint devices. Today, and driven by cost and sustainability concerns about the energy and carbon footprint of the IT infrastructure we see energy efficiency becoming a pervasive issue that is considered in all information technology areas starting at the circuit level to device architecture and platforms to the system level of whole datacenters management
