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Research of the Noise Immunity when Using Fractional Frequency Reuse in Mobile Satellite Service

The investigation of the directivity pattern side-lobe level impact of the concentric ring antenna arrays to noise immunity of the receiver when using fractional frequency reuse was provided. The frequency planning of radio networks is necessary instrument to address issues of assigning frequency bands for mobile satellite service in conditions of limitations of frequency and energy resources. Only frequency planning allow to achieve high level of efficiency of bandwidth assigned for network. The concept of equivalent cluster dimension was introduced, which characterize the work of the spatially separated antenna beams in combined channels. Demands on the side-lobe level of satellite transponder antenna arrays were described and data throughput was calculated based on Signal Interference Noise Ratio.