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Green Radio: Radio Techniques to Enable Energy Efficient Wireless Networks

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  • Communication
  • Computer Science
  • Design
  • Ecology
  • Geography
  • Mathematics


Layout 1 INTRODUCTION Given the worldwide growth in the number of mobile subscribers, the move to higher-data-rate mobile broadband, and the increasing contribu- tion of information technology to the overall energy consumption of the world, there is a need on environmental grounds to reduce the energy requirements of radio access networks. A typical mobile phone network in the United Kingdom may consume approximately 40–50 MW, even excluding the power consumed by users’ hand- sets. In developing countries direct electricity connections are not readily available, so Voda- fone, for example, use in excess of 1 million gal- lons of diesel per day to power their network. Mobile communications thus contributes a sig- nificant proportion of the total energy consumed by the information technology industry. From an operator’s perspective, reducing ener- gy consumption will also translate to lower operat- ing expenditure (OPEX) costs. Reducing carbon emissions and OPEX for wireless cellular net- works are two key reasons behind the develop- ment of the Mobile VCE Green Radio program. For example, the U.K. operators Orange and Vodafone both aim to achieve significant reduc- tions in CO2 emissions in the next 10 years. The Green Radio program sets the aspiration of achieving a hundredfold reduction in power con- sumption over current designs for wireless com- munication networks. This challenge is rendered nontrivial by the requirement to achieve this reduction without significantly compromising the quality of service (QoS) experienced by the net- work’s users. In order to meaningfully measure success, appropriate measures of energy consump- tion must be applied. For example, a reduction in radiated power is not of benefit if it is achieved at the expense of a greater increase in power con- sumed in signal processing or vice versa. The Green Radio project is pursuing energy reduction from two different perspectives. The first is to examine alternatives to the existing cel- lular network structu

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