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D–1

Appendix D. Carrier-in-Carrier

PERFORMANCE

CHARACTERIZATION

D.1 Carrier-in-Carrier

Description

DoubleTalk™ Carrier-in-Carrier

(CnC) is an adaptive cancellation technology that

significantly reduces bandwidth occupancy by allowing two carriers to simultaneously

occupy the same spectral location, a practice that is disastrous for normal carriers. By

comparison, standard carriers must occupy non-overlapping spectral segments with no

more than one carrier in the same space.

In a number of ways, CnC carriers behave similar to conventional carriers in satellite

links. They are both exposed to adjacent carriers, cross-polarization and rain fade, and

exhibit impairments when any of these become too great. In addition, CnC operates in an

environment where:

• Carriers intentionally occupy the same spectral slot

• Performance depends upon desired and co-located interfering carrier.

Several areas relating to CnC performance are discussed, including:

• Adjacent carrier performance

• Eb/No Degradation as a function of the CnC ratio

• Symbol rate ratio

• Carrier offset

• The effects of rain fade and asymmetric antennas.

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Comtech EF Data CDM-Qx Especificaciones Pagina 243