In this paper, we analysed the interference effects of Korea's LTE-TDD system by Japan's WiMAX system using the 2.5GHz frequency band. We performed Monte-Carlo simulations on the average throughput loss to evaluate how much interference radiating from Japan's WiMAX is imposed on the Korean LTE-TDD system and the Advanced Propagation Model (APM) for calculating the propagation loss occurring in duct. The results of the established methodology can be used as a guideline for deployment planning for LTE-TDD system with an acceptable interference impact.
Recently, as a variety of cellular systems are coexisted and the use of mobiles in a confined space increases, interference problems between terminals become more important. In this paper, we derive the closed-form probability density function (PDF) of the downlink signal-to-interference ratio (SIR) due to uplink transmission of the adjacent terminal station of the other system for the coexistence environment of two cellular systems. And it is shown that the formula of the PDF is exactly the same with Monte-Carlo simulation. This probability distribution model of the SIR is useful in that it is very simple and can be applicable to general propagation models including shadow fading. With this model, interference analysis for coexisting LTE systems in 900 MHz band of South Korea is suggested.
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