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"We are the first who raised the concept of energy-efficient and green OFDMA and designed it" with Guowang Miao

With the ICT industry consuming up to 10% of the world’s energy and doubling every five years, there is a mounting pressure to engineer “Green ICT systems” where energy consumption is seen as a first-class system property.

Guowang Miao, Associate Professor in Communication Systems at KTH and researcher in low-energy wireless systems.

Our research in energy-efficient wireless communications provides a solid foundation for future researchers in this area, especially for wireless networks built with multiple antennas (Multiple Input Multiple Output, MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) technologies, which are the core technologies of the fourth-generation (4G) mobile communication systems, including WiMax, LTE Advanced, and so on. We are the first who raised the concept of energy-efficient and green OFDMA and designed it.

In our paper, "energy efficient design in wireless OFDMA", we initiated the important concept that the network, for example base stations in cellular communications, can dynamically allocate network resources, including bandwidth, time slots, to significantly improve the energy efficiency of mobile terminals and extend their battery life. This important finding has already been accepted by IEEE 802.16m standard and will have global impact soon. Furthermore, while the famous Shannon capacity formula tells us the spectral efficiency upper bound of point-to-point communications, the energy efficiency upper bound was not known before.

Our research on "Energy-efficient link adaptation in frequency-selective channels" not only rigorously reveals the energy efficiency upper bound, but also tells the optimal modulation and coding method to achieve the upper bound. This significant research result will guide energy efficient design of all communication devices. The publication out of this research is the most cited paper in IEEE Trans. Communications (TCOM) since 2010 and it contributes more than 40% of citations of all papers related to energy-efficient designs published on TCOM in the last three years.