Comtech EF Data MCED-100 - Manual (Page 92)

MCED-100 MetaCarrier Embedding Device Revision 1
Appendix A MN-MCED100
A–6
A.6 Scenario 5: Complete Interference
Item Description
A “Desired” 5.0 Msps DVB-2 Video Carrier
B “Interfering” 5.0 Msps DVB-2 Video Carrier
Figure A-5. Scenario 5 (Complete Interference)
In this scenario (Figure A‐5), two 5.0 Msps carriers contain an identical center frequency and
symbol rate. If the carriers have Carrier ID technology enabled, situations such as this require
special consideration because, while the MCxD‐100 may be instructed to look in the spectrum
below the composite envelope of both 5.0 Msps carriers to determine if carrier IDs are present,
the MetaCarriers may be at the same MetaCarrier center frequency and chip rate. Therefore,
multiple approaches may need to be undertaken to obtain the MetaCarrier information from
the interfering carrier:
• Step 1: The simplest step to take is to allow the MCxD‐100 to look under the carriers. If
both carriers’ properties are approximately the same, there is a 50% probability that the
MCxD‐100 will lock to the desired carrier or the interfering transmission carrier.
If the MCxD‐100 locks to the desired carrier and not the interfering carrier, the user may
instruct the MCxD‐100 to reacquire. This will cause the MCxD‐100 to again look for the
MetaCarrier.