Page 77 - GuideFWA

IN TER FER EN C E AN ALYSIS C ASE

Param eter Interfering TX Victim R X

System PHS IS95
D evice Term inal B ase Station

Frequency D ata

1850-1990 M H z Frequency Block 1910 -1930 M H z C (low erpart)
W orking Frequency (M H z)
N um berofguard channels 1910,450 1908,750
G uard Band betw een channeledges (KH z)
TX/R X frequency O ffset(KH z) 00

925

1700,0

System D ata

TX Pow er(dBm ) 19

R X sensitivity (dBm ) **See N ote ** -120
-12
Specific C /Ivalue forR eceiverVictim System (dB)

Antenna and FeederD ata

Antenna heigth (m ) 8,0 25,0
Antenna G ain (dBi) 10,0 17,0
Antenna H orizontalBeam w idth (º) 60 105
Antenna VerticalBeam w idth (º) 60
Antenna D ow ntilt(º) 9
2 -3

FeederLosses (dB) 1,0 2,0

O therC alculation Inputs

Im provem enton TX m ask specification (dB) 0,0
Allow ed R x D esensitization (dB) 1,0

N ote:This is the R eceiverSensitivity w ith R ayleigh Fading (7 dB )

R ESU LTS

R equired distances forD esentization equalto 1 dB : R eq.distance (m )

W hen both TX and R X are on R X and TX antenna 3dB-beam w idth 919,1
W hen only R X is on TX antenna 3dB-beam w idth 0,5
W hen only TX is on R X antenna 3dB-beam w idth 0,5
W hen both TX and R X are outofR X and TX antenna 3dB-beam w idth 0,0

R equired distances w hen TX and R X antennae are on-beam ,fordifferentD esentization:

Desentization (dB)3,00 D esentization (dB ) R eq.D istance (m ) ###
2,50 ###
2,00 500,0 1000,0 1500,0 2000,0 1,0 919,1 ###
1,50 ###
1,00 0,25 1921,3 ###
0,50 0,50 1338,9 ###
0,00 0,75 1077,2 ###
1,00 919,1 ###
0,0 1,25 809,8 ###
1,50 728,1 ###
Required Distance (m) 1,75 663,9
2,00 640,3
2,25 594,4
2,50 555,1
2,75 521,0
3,00 490,9

Inter-American Telecommunication Commission 63