Abstract
This paper looks into coexistence and sharing between systems as a recently critical issue due to emerging new technologies and spectrum scarcity. At WRC-07, ITU-R allocated 3400-3600 MHz band for the coming fourth generation (4G) or IMT-Advanced on a co-primary basis along with existing Fixed Wireless Access (FWA) systems. Therefore, coexistence and sharing requirements like separation distance and frequency separation coordination must be achieved in terms of both co-channel and adjacent channel frequencies. Co-sited the two base stations antennas and non co-sited coexistence of the twos systems are investigated. The interference analysis models, adjacent channel interference ratio ACIR and spectrum emission mask are applied in the mentioned band to extract the additional isolation needed to protect adjacent channel interference. Also interference to noise ratio as a standard interference criteria is introduced and possible engineering solutions are suggested and explained at last.
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