Newtec Proprietary
Confidentiality: Unrestricted
R3.2_v1.0
277/387
Feature Descriptions
MDM9000 Satellite Modem
16.16 Bandwidth Cancellation
Bandwidth cancellation is a technique which is based on echo cancellation. This technique allows
two parties to use the same carrier (characterized by frequency band, polarization, space,
propagation direction, ...) at the same time.
As both parties know their own information they have sent, they are able to "cancel" their own echo
from the received counter party signal. Echo cancellation is based on some form of correlation
technique to extract information of interest which is submersed in "other information" of non interest.
The main requirements to perform bandwidth cancellation are:
• The ground station must be able to see its own echo.
• Both terminals must be in the same satellite footprint.
Bandwidth cancellation is mainly used to gain satellite capacity. Satellite capacity is gained by
transmitting the forward and return carrier of the satellite link in the same frequency band.
In a typical satellite link, the forward and return carriers exist next to each other.
Applying bandwidth cancellation can lead to a reduction in output power and bandwidth gain.
This is displayed in the following figure:
Bandwidth cancellation brings most gain in symmetrical links! Please do a link budget
calculation up front to see what is possible.
Please refer to the Bandwidth Cancellation Link budget Considerations document.
When using a temporary license to evaluate the Bandwidth Cancellation feature be
aware that the license is activated on device level and not on feature level.
Meaning that the license expires when the device is active, even if BWC is not used.
To Next Page
Loading...
