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http://dx.doi.org/10.5515/KJKIEES.2007.18.3.341

Derivation of Protection Ratio and its Calculation for Microwave Relay System Based upon Composite Fade Margin and Availability  

Suh, Kyoung-Whoan (Department of Electronic Engineering, Kangnam University)
Lee, Joo-Hwan (Radio Broadcasting Technology Laboratory, ETRI)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.3, 2007 , pp. 341-350 More about this Journal
Abstract
In this paper, the derivation of protection ratio is newly proposed for the detailed planning of frequency coordination in microwave relay networks, and computed results for protection ratio of co-channel and adjacent channel are illustrated over the actual system and its frequency. It is shown that the suggested method based upon availability prediction can be expressed in terms of composite fade margin, interference-to-noise ratio(I/N), net filter discrimination, and system parameters. According to results, for 6.7 GHz, 60 km, 64-QAM, and I/N= -6 dB at BER $10^{-6}$, composite fade margin and co-channel protection ratio provide 25.5 and 50.7 dB, respectively. Also, net filter discrimination and adjacent channel protection ratio are obtained as 26.3 and 24.4 dB, respectively, at the first adjacent channel of 40 MHz. The proposed method provides some merits in computing protection ratio for microwave relay networks in view of an easy extension and practical applications considering more detailed and various system parameters.
Keywords
Microwave Relay System; Composite Fade Margin; Frequency Coordination; Protection Ratio; Net Filter Discrimination;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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