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Title:
Prediction of the Space-Frequency Correlation Function for Base Station Diversity Reception
Authors:
Mine Kalkan and Richard H. Clarke
Publication:
"Prediction of the Space-Frequency Correlation Function for Base Station Diversity Reception", Mine Kalkan and Richard H. Clarke , IEEE Transactions on Vehicular Technology, Vol 46 No. 1 February 1997, pp. 176-184
Publication Date:
01/02/1997
ISBN:

ISSN:


Abstract:
In this paper, a model is proposed to estimate the signal statistics for urban-area base stations with highly elevated antennas. Based on the model, the envelope correlation of the received signal is estimated in the case of hybrid space-frequency diversity reception at the base. It is shown that the spatial correlation of the complex signals is determined by the mean angle of arrival and the width of the incoming beam. Useful closed-form approximations for inline and broadside antenna orientations are obtained. Comparisons between the theoretical model and available experimental data provide adequate justification for the model. It is shown that the lowest spatial correlations among all the possible angular orientations are obtained when the mean direction of incoming signals is perpendicular to the axis of the base antennas. For this case, an antenna separation of 26l is required to achieve an envelope correlation of 0.7 when the width of the incoming beam os 0.7°, and this separation reduces to 9l for a width of 3°. The results indicate that the required spacings can be further reduced by using frequency diversity in conjunction with space diversity. Generalization of the model to incorporate local scattering effects is also proposed.