Issue Number: Vol. 5, No. 1
Year of Publication: Jan - 2015
Page Numbers: 44-51
Authors: A. A. Ayeni, N. Faruk, N. T. Surajudeen-Bakinde, R. A. Okanlawon, Y. A. Adediran
Journal Name: International Journal of Digital Information and Wireless Communications (IJDIWC)
- Hong Kong
DOI:  http://dx.doi.org/10.17781/P001560


Increasing demand for spectrum in recent years has led to a greater emphasis on spectrum efficiency. A metric is needed to efficiently evaluate the utilization of the spectrum in a spectrum sharing system. In this work, we have introduced a new metric, called spatial spectrum utilization efficiency (SSUE) for evaluating the efficiency of reusing the TV spectrum. The model employed in this work, consists of a single primary transmitter network and multiple secondary networks transmitting outside the noise limited grade B contour. Simulation results indicate that for a typical low power TV transmitter of 1 kW and 4 W secondary users, the minimum and maximum achievable spectrum efficiency limits for primary networks are 28% and 54%, when the PU height are 100 m and 600 m respectively. However, the efficiency could be increased up to about 83% when 2500 nodes (i.e. SUs) are deployed. Also, the sensing-only method does intelligent detection but do not generally utilize the spectrum as efficiently as the proposed method, due to the large protection margins. However, the proposed method has prior knowledge of the specific interference protection requirements for each primary network which maximizes utilization of the spectrum.