Abstract

Spectral efficiency and energy efficiency are important design criteria for green communications. In this paper, spectral efficiency and energy efficiency are addressed for transmission over channels that are orthogonal in frequency. The maximum sum rate is used in measuring the spectral- and energy-efficiency. The combined spectral- and energy-efficiency of particular total bandwidth and total transmit power is maximized with joint bandwidth assignment and transmit power allocation. Furthermore, with an emphasis on spectral efficiency or energy efficiency, an algorithm is provided to determine the optimal total bandwidth or the optimal total transmit power. Simulation results validate the transmission approaches that achieve the best spectral efficiency and energy efficiency.

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