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Green radios jointly consider the spectrum efficiency and the energyefficiency in wireless networks in order to provide sustainable development. Inthe past two decades, various green radio solutions for different types ofterminals and radio access networks have been developed, some of which havebeen used in the designs of wireless products. In this paper, we provide ahistorical view on some fundamental works and practical issues. In addition toproviding a comprehensive overview on theoretical achievements, we also discussseveral important power saving solutions with notable engineering impacts, suchas Doherty power amplifier and separated baseband unit - remote radio unitarchitecture, which might be overlooked in previous publications. Moreover,with the huge growth of wireless traffic in the near future, green radio designfor future wireless networks shall involve an end-to-end energy efficiencyinvestigation of mobile terminals, radio access and core networks, anddifferent applications. By introducing green radio schemes for advancedterminals and future wireless networks, this article will not only bebeneficial for readers with only preliminary background in communications andsignal processing but also have reference and historical values for researchersand practical engineers in the area.

First 20 Years of Green Radios