Mumbai University > EXTC > Sem 8 > Satellite Communication and Networks

Marks: 10M

Explain in detail the operation of the spade system of demand assignment. What is the function of the common signalling channel?

OR

Explain SPADE system of FDMA?

Spade is an acronym for single-channel-per-carrier pulse-code-modulated multiple-access-demand-assignment equipment. This system is extensively used with digital signals.

The distributed-demand assignment facility requires a common signalling channel. The CSC bandwidth is 160 KHz, and its centre frequency is 18.045 MHz below the pilot frequency. To provide interference with CSC, voice channels …