资料介绍
GSM Measurement BasicsGSM Measurement Basics
GSM900 DCS1800
Q +180 +90 0 -90 -180
I
Agenda
The Basis For GSM Measurements
Maintaining the RF Link Interference Generation
GSM Cells
GSM Measurement Maintain High Principals Don’ t Interfere with
Quality Radio Link Under All Expected Conditions
MeMe Me Me
Me
Other GSM Links or Other Users of the RF Spectrum
Sha re e r a Sh Share Share
Maintaining the Link Just Enough Power
s s o L Path
Talk Time
4Enough Power to Overcome Path Loss 6 Too Much Power Drains Battery
Maintaining the Link ModulationQQuality
I Q
Received
Q
I
I
Transmitted
Interference
Maintaining the Link Receiver Performance
Multipath & Doppler Usable Range Sensitivity
Adjacen Timeslo Blocking & Spurious Adjacent & Co-Channel
Don’ t Interfere With Other Time Users 7
6
Amplitud