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A Study on Calculation of Protection Ratio for Interference Analysis in Fixed Radio Relay Networks  

Suh Kyoung-Whoan (School of Knowledge-Based Information Engineering, Kangnam University)
Lee Joohwan (Radio Technology Group, ETRI)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.1, 2006 , pp. 133-142 More about this Journal
Abstract
This paper suggests an efficient method of protection ratio(PR) calculation and shows some results of point-to-point radio relay system for frequency coordination. The proposed PR can be expressed as a function of C/N of modulation scheme, noise-to-interference ratio(N/I), multiple interference allowance, fade margins of multi-Path and rain attenuation and net filter discrimination. And PR calculation is performed in view of fade margin, modulation scheme, distance, and interference for actual point-to-point radio relay frequency. According to results for 6.2 GHz, 64-QAM and 60 km at BER 10-6, fade margin and co-channel Protection ratio reveal 41.1dB and 74.9 dB, respectively The merit of presented method provides a systematic and easy calculation by means of PR correction factor related with various parameters and can apply the same concept to frequency coordination of millimeter wave radio relay system.
Keywords
Radio relay system; protection ratio; fade margin; availability; carrier-to-interference ratio; net filter discrimination;
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