EVALUATION OF SPECTRAL Vs ENERGY EFFICIENCY TRADEOFF CONSIDERING TRANSMISSION RELIABILITY IN CELLULAR NETWORKS
Woldegebreal, Dereje H.
AffiliationMorgan State University, Department of Electrical and Computer Engineering
Hawassa University, School of Electrical and Computer Engineering
Addis Ababa University, School of Electrical and Computer Engineering
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AbstractSpectral efficiency (SE), energy efficiency (EE), and transmission reliability are basic parameters to measure the performance of a cellular network. In this paper, spectral efficiency and energy efficiency tradeoff is considered keeping in mind the transmission reliability, where all the three are function of signal to noise ratio (SNR). SNR, in turn is a function of constellation size (or the number of bits per symbol) and data rate. Then, we propose a new power model which is as function of this SNR. Based on the power model, SE-EE trade-off function is evaluated taking transmission reliability in to consideration. Results confirmed that increasing constellation size results an increase in SNR and leads to a significant increase in energy efficiency without changing the transmit power. To demonstrate the validity of our analysis, channel gain and constellation size are varied keeping transmit power constant. The results also indicate that securing transmission reliability, the EE-SE trade-off is optimized by increasing the constellation size.
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