EQUIPMENT MANUAL FOR RF-9122 GSM900-GSM1800 FSR
RF-9122T18 QE
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Page 49
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7.2 APPENDIX B: REPEATER’S INTERFERENCE TO BTS
The interference to BTS from master-unit must be minimized for the required coverage; uplink noise
output of the master-unit will give rise to the noise level at the BTS port.
The noise gain induced by the equipment at the BTS port has the following relationship:
Where:
G
rep
–
uplink gain of the repeater (dB)
L
d
–
distance loss from DT port of the repeater to BTS port
F
rep
–
uplink noise figure of the repeater
F
BTS
–
uplink noise figure of BTS
Whilst keeping the parameters constant, such as
G
rep
increases, the interference to BTS increases,
BTS coverage will reduce to give and the repeater extended coverage.
It is essential that in addition to ensure coverage is achieved, the uplink gain G
rep
should be adjusted
to minimize the impact on BTS.
