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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국전자파학회JEES Journal of Electromagnetic Engineering And Science Journal of The Korea Electromagnetic Engineering Society Vol.6 No.3
발행연도
2006.9
수록면
189 - 195 (7page)

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초록· 키워드

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In this paper, the derivation of the protection ratio for the digital microwave system with diversity is newly suggested for a basic guidance of initial planning for frequency coordination, and computational results are presented for an actual radio frequency band. The net filter discrimination has been also examined to see the effect of the adjacent channel protection ratio caused by adjacent channel interference. In addition, the protection ratios for the space or frequency diversity system are analyzed in terms of diversity improvement factors to find out an equivalent allowable noise-to-interference ratio (N/I) from degraded fade margin. According to results for 6.2 ㎓ system, with the space diversity of 25 m distance between antennas or the frequency diversity of △f/f =0.05, under 64-QAM and 60 ㎞ at BER 10??, the protection ratio can be greatly reduced in comparison to the non-diversity system. So, assuming that only the same protection ratio as the non-diversity system is kept, it is shown that the system with diversity may get more interference level of N/I allowing from 9.0 to -5.9 ㏈ or from 6.0 to -4.3 ㏈ for the space or frequency diversity. In consequence, it is concluded that the diversity system is more robust or tolerable for interferences or fades, which may play an important role in overcoming N/I to some extent.

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Abstract
Ⅰ. Introduction
Ⅱ. Formulation of Protection Ratio
Ⅲ. Simulated Results and Discussion
Ⅳ. Conclusions
References
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