4 Functional Description
ID No: 7164491 Page 31
4.2. FEATURES
4.2.1. Digital Channel Filters
Each filter of the both channels selects a special channel from the GSM/EGSM
frequency band. Filters are set automatically according to the channels set in “Setup
Wizard” or “Technician Setup”. For further information about these menus refer to the
User's Manual for Node G Software.
4.2.2. Digital Interference Cancellation Equipment (ICE)
Digital ICE has been developed to enhance antenna isolation. This feature enables
the Node G to provide coverage in areas where effectivity is decreased due to
physical site limitations which cause insufficient antenna isolation.
Antenna isolation is the RF loss measured between the donor antenna and the
coverage antenna. If the gain of the network element exceeds the path loss,
feedback in form of oscillation occurs. The isolation is usually dominated by the direct
path loss from one antenna to the other, but reflections can contribute to or even
affect antenna isolation. Digital ICE cancels the signal from the primary feedback
path, thus allowing the gain of the network element to be increased.
The required delay resulting from the on-site conditions is measured by the DCM
module and set accordingly.
For software setting commands please refer to the online help screens.
The digital ICE function can be enabled or disabled in the “Technician Setup” page of
the software.
Isolation and gain margin * can be checked in the “Status and Reports” menu
accessible via the home page of the web interface.
* gain margin = antenna isolation minus Node G gain
4.2.3. Frequency Hopping
The Node G repeater supports Frequency Hopping (base band and synthesized
hopping). The repeater follows the hopping of the individual TRx and thus of the
covered mobiles. The hopping parameters like channel numbers, hopping sequence
number (HSN) and mobile allocation index offset (MAIO) have to be set in the
Technician setup of the SW.
The frequency hopping is done by the DCM.
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