Spectral and Energy Efficiency of Parallel Gaussian Broadcast Channels.
Year: 2016
Type: preprint
Abstract: Spectral efficiency and energy efficiency are important design criteria for green communications systems and networks. In this paper, spectral efficiency and energy efficiency are addressed for communications over parallel Gaussian broadcast channels as the channels are orthogonal in frequency. The maximum sum rate is used in measuring spectral- and energy-efficiency. First, the maximum efficiency is obtained through two separated optimization problems. With a fixed transmit power allocation, the optimal bandwidth assignment is given and a procedure is provided to determine the total bandwidth for maximum spectral efficiency. With a fixed bandwidth assignment, the optimal transmit power allocation is given and a procedure is provided to determine the total transmit power for maximum energy efficiency. Secondly, the combined spectral- and energy-efficiency of particular total bandwidth and total transmit power is maximized with joint bandwidth assignment and transmit power allocation. With emphasis on spectral efficiency or energy efficiency, an algorithm is provided to further determine the optimal total bandwidth or the optimal total transmit power. Simulation results validate the transmission approaches over parallel Gaussian broadcast channel that achieve the best spectral efficiency and energy efficiency.
Source: arXiv (Cornell University)
Author: Liang Dong
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2469315015