Abstract
To maximize energy efficiency in communications, particularly wireless communications, it is necessary to minimize power dissipation in all circuitry. This joint minimization is unfortunately not independently achievable. Decisions on the type of signal modulation adopted for use in any particular application can and do put lower limits on achievable circuit power dissipation, and therefore putting a ceiling on achievable energy efficiency. Such restrictions must be removed to fully realize our Green Communications objectives. Here the reasons for the energy efficiency limits are presented, which results in a new Figure of Merit for appropriateness of a signal selection with respect to maximizing available communication energy efficiency.
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