Journal of electromagnetic engineering and science

  • 제7권2호
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  • Pages.83-90
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  • 2007
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  • 2671-7255(pISSN)
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  • 2671-7263(eISSN)
한국전자파학회 (The Korean Institute of Electromagnetic Engineering and Science)
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A Protection Ratio with Composite Fade Margin for Detailed Frequency Coordination in Microwave Relay System Network

  • 발행 : 2007.06.30
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초록

In this paper, the formulation of the protection ratio based upon a composite fade margin and availability is newly presented for the detailed planning of frequency coordination in the microwave relay system network, and computed results for co-channel and adjacent channel protection ratios are illustrated over an actual system with 6.2 GHz. It is shown that the protection ratio to assure a quality of service can be expressed in terms of the composite fade margin, noise-to-interference ratio, net filter discrimination, and system parameters. In addition, the net filter discrimination, depending upon the transmitter spectrum mask and the overall receiver filter characteristic, has been examined to investigate the effect of the adjacent channel protection ratio caused by the adjacent channel interference. Regarding simulated results for 6.2 GHz, 60 km, 64-QAM, and N/I=6 dB at the bit error rate of $10^{-6}$, composite fade margin and co-channel protection ratio yield 25.14 and 50.3 dB, respectively. Also, the net filter discrimination of 26.5 dB and the adjacent channel protection ratio of 23.8 dB are obtained at the first adjacent channel of 30 MHz. The proposed method provides some merits in view of a comprehensive and practical application with more detailed and various system parameters needed to access the criteria for making the proper frequency coordination.

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참고문헌

  1. K. W. Suh, 'A study on the criteria of co-channel and adjacent channel interferences allowable in the M/W relay networks', ETRI Report, Nov. 2004
  2. A. A. R. Townsend, Digital Line-of-Sight Radio Links: a Handbook, Prentice-Hall, International(UK), 1988
  3. ETSI TR 101 854, 'Derivation of receiver interference parameters useful for planning fixed service point-to-point systems operating different equipment classes and/or capacities', Jan. 2005
  4. USA, 'Report & tutorial: carrier-to-interference objectives', NSMA, Report WG5.92.008, Jan. 1992
  5. UK, 'Technical frequency assignment criteria', RA, Jun. 2003
  6. Australian Communications Authority, 'Microwave fixed service frequency coordination(RALI, FX3)', 2003
  7. K. W. Suh, J. W. Lee, 'A study on a comprehensive protection ratio calculation applicable to initial planning for frequency coordination in the fixed wireless networks', International Conference on Advanced Communication Technology(ICACT), pp. 388-392, Feb. 2006
  8. K. W. Suh, 'A generalized formulation of the protection ratio applicable to frequency coordination in digital radio relay networks', Radio Sci., vol. 42, RS1007, doi:10.1029/2006RS003470, Feb. 2007
  9. K. W. Suh, W. G. Jang, 'The analysis of protection ratio and its effect of interference-to-noise ratio for digital microwave system with diversity', Journal of the Korea Electromagnetic Engineering Society(KEES), vol. 6, no. 3, pp.189-195, 2006
  10. Rec. ITU-R F.758-3, 'Considerations in the development of criteria for sharing between the terrestrial fixed service and other services', 2004
  11. R. L. Freeman, Radio System Design for Telecommunications(2nd Edition), John Wiley & Sons, 1997
  12. K. W. Suh, 'A study on transmission quality and frequency movement for digital microwave link design', Journal of the Korea Electromagnetic Engineering Society, vol. 14, no. 5, pp. 489-498, May 2003
  13. W. D. Rummler, 'A simplified method for the laboratory determination of multipath outage of digital radios in the presence of thermal noise', IEEE Trans. Commun., vol. COM-30, no. 3, pp. 487-494, Mar. 1982
  14. W. D. Rummler, 'A comparison of calculated and observed performance of digital radio in the presence of interference', IEEE Trans. Commun., vol. COM-30, no. 7, pp. 1693-1700, Jul. 1982
  15. K. W. Suh, 'A study on the frequency coordination for digital M/W networks', ETRI report, Nov. 2006
  16. K. W. Suh, 'A study on the design of cross-polarization interference canceller for digital radio relay system with co-channel dual polarization', Journal of the Korea Electromagnetic Engineering Society, vol. 13, no. 3, pp. 225-236, Mar. 2002
  17. Rec. ITU-R F.1101, 'Characteristics of digital fixed wireless systems below about 17 GHz', 2004
  18. ETSI EN 301 127, 'Fixed radio systems; point-topoint equipment; high capacity digital radio systems carrying SDH signals $(up\;to\;2{\times}STM-1)$ in frequency bands with about 30 MHz channel spacing and using co-polar arrangements or cochannel dual polarized operation', 2002