A generalized formulation of the protection ratio applicable to frequency coordination in digital radio relay networks
Article first published online: 28 FEB 2007
Copyright 2007 by the American Geophysical Union.
Volume 42, Issue 1, February 2007
How to Cite
2007), A generalized formulation of the protection ratio applicable to frequency coordination in digital radio relay networks, Radio Sci., 42, RS1007, doi:10.1029/2006RS003470.(
- Issue published online: 28 FEB 2007
- Article first published online: 28 FEB 2007
- Manuscript Accepted: 20 OCT 2006
- Manuscript Revised: 7 JUN 2006
- Manuscript Received: 27 JAN 2006
- protection ratio;
- fade margin;
- net filter discrimination
 This paper proposes an efficient and comprehensive algorithm for computing the protection ratio and illustrates some results applicable to the initial planning of frequency coordination for fixed wireless networks. A net filter discrimination depending upon transmitter spectrum mask and overall receiver filter characteristic is also examined to see the effect of adjacent channel interferences. Numerical simulations for cochannel and adjacent channel protection ratios are performed for the 6.2 GHz frequency band, including transmitter spectrum mask and receiver filter response. According to results for 64-QAM (quadrature amplitude modulation) and 60 km at bit error ratio 10−6, fade margin and cochannel protection ratio are 41.1 and 74.9 dB, respectively. In addition, it is shown that the net filter discrimination for 30 MHz channel bandwidth provides 26.5 dB at the first adjacent channel, which yields adjacent channel protection ratio of 48.4 dB. The proposed method gives an easy and systematic method to compute the protection ratio and can be applied to frequency coordination in fixed wireless networks up to the millimeter wave band.