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Published on: Mar 3, 2016
Source: www.slideshare.net

• 1. Attenuation Surface Plot 13dB/km Mean 52dB/km Max 60GHz Link Budget w/ Rain Cell Modeling
• 2. Wind Rain Cells Rain cell size is inversely proportional to peak rain rate, and the vast majority of cells are less than 1 sq-km. Rain cells are usually modeled with an exponential rolloff from a peak rain rate located at the center of an ellipse. Major and minor axis radii are defined by the 1/e point of the 2D exponential. Rain Cell Modeling Approach Low Peak Rain Rate Med Peak Rain Rate High Peak Rain Rate where ( ) ( )22 // ),( yx yx meRyxRainRate ρρ +− = eMaxRainRatRm = rolloffyy _=ρ rolloffxx _=ρ )/1( e )/1( e after Capsoni, et al., Radio Science, vol. 22, no. 3, May 1987
• 3. 0 20 40 60 80 100 120 140 160 180 200 2000 2500 3000 3500 4000 4500 5000 Rain Cell Size vs. Rain Rate Rain Rate (mm/hr) Ave Cell Radius (ft)               +      = −− 26.010 66 7.1 RmRm Radius after Capsoni, et al., Radio Science, vol. 22, no. 3, May 1987 From Experimental Observations
• 4. Rain Cell Modeling – Simulation Example Rain Rate Surface Plot Mean RR=35mm/hr (A=99.9% or 8hr/yr in FL) Max RR = 165mm/hr (A=99.999% or 5min/yr in FL)
• 5. Rain Rate Contour Plot Mean RR=35mm/hr (A=99.9% or 8hr/yr in FL) Max RR = 165mm/hr (A=99.999% or 5min/yr in FL) Rain Cell Modeling – Simulation Example
• 6. Rain Rate Color Map Rain Cell Modeling – Simulation Example
• 7. Mean RR=35mm/hr (A=99.9% or 8hr/yr in FL) Max RR = 165mm/hr (A=99.999% or 5min/yr in FL) Rain Cell Modeling – Simulation Example
• 8. Attenuation Surface Plot 13dB/km Mean 52dB/km Max Rain Cell Modeling – Simulation Example
• 9. 30dB/km Contour 50dB/km Contour WindSpeed Fade Margins 2000ft  19dB 1500ft  25dB 1000ft  31dB 40dB/km Contour Max Line Integral <45dB/km Rain Cell Modeling – Simulation Example
• 10. Example Rain Rates and Link Ranges for CONUS (from FCC Bulletin-70, Page-15) Region 99% Availability 99.9% Availability 99.99% Availability 99.999% Availability ND-TX and west 4250ft (2.2mm/hr) 3,750ft (10mm/hr) 2,900ft (35mm/hr) 2075ft (90mm/hr) All CONUS less FL,GA,M S,AK,LA 4050ft (4.7mm/hr) 3,225ft (22mm/hr) 2,400ft (63mm/hr) 1800ft (126mm/hr) FL,GA,M S,AK,LA 3950ft (6mm/hr) 2900ft (35mm/hr) 2,000ft (98mm/hr) 1580ft (165mm/hr)
• 11. Link Range and Data Rate (A=99.99%) (FCC Bulletin-70, Page-15, A=99.99%) 100 200 300 400 500 600 700 800 900 1000 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 ND to TX and West (90mm/hr) CONUS save FL/GA (90mm/hr) FL,GA,etc. (90mm/hr)