Post by Eric Johnston on Jun 7th, 2013 at 9:34am
Carrier in Carrier refers to a Comtech technique for making use of satellite bandwidth by transmitting two carriers on top of one another, like so:
Provided each earth station is in the same coverage beam and can therefore see its own transmitted signal, it is able to subtract a delayed version of its own transmit carrier from the received carriers and thus remove the 'interference'.
I've heard of the very successful use of this technique on a point to point link between a pair of large earth stations, with whole transponders being fully utilised, twice over !
Read full explanation here:
https://www.comtechefdata.com/files/articles_papers/WP-Doubletalk%20Carrier-in-Carrier%20&%20CDM-625%20White%20Paper.pdf
( From where the above spectrum analyser images are reproduced. )
Best regards, Eric.
Provided each earth station is in the same coverage beam and can therefore see its own transmitted signal, it is able to subtract a delayed version of its own transmit carrier from the received carriers and thus remove the 'interference'.
I've heard of the very successful use of this technique on a point to point link between a pair of large earth stations, with whole transponders being fully utilised, twice over !
Read full explanation here:
https://www.comtechefdata.com/files/articles_papers/WP-Doubletalk%20Carrier-in-Carrier%20&%20CDM-625%20White%20Paper.pdf
( From where the above spectrum analyser images are reproduced. )
Best regards, Eric.