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Characterizing the fundamental tradeoffs for maximizing Energy Efficiency (EE) versus Spectrum Efficiency (SE) is a key problem in wireless communication. In this paper, the authors address this problem for a point-to-point Additive White Gaussian Noise (AWGN) channel with the transmitter powered solely via energy harvesting from the environment. In addition, they assume a practical on-off transmitter model with non-ideal circuit power, i.e., when the transmitter is on, its consumed power is the sum of the transmit power and a constant circuit power. Under this setup, they study the optimal transmit power allocation to maximize the average throughput over a finite horizon, subject to the time-varying energy constraint and the non-ideal circuit power consumption.
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