Signal Design

Question 1

What are the advantages of Digital Signals over Analog?

Answer 1

Better signal regeneration. More resistant to noise, interference, and distortion.

Question 2

Describe TDOA

Answer 2

Pathlength difference as the signals travel through the primary and adjacent satellites

Question 3

Describe FDOA

Answer 3

Difference in frequency due to the Doppler Effect of signals travelling from the primary and adjacent satellites

Question 4

FDMA

Answer 4

Users share the satellite simultaneously, but each user transmits at a single frequency

Ad: Simplicity, proven and reliable
Dis: Needs more BW as you add more users

Question 5

TDMA

Answer 5

Users share a single RF channel by allocation of different time slots to each user

Ad: user gets full BW during their time slot
Dis: Limited time slots

Question 6

CDMA

Answer 6

Each user is provided with a code. If you have the code, you can discern the desired message

Ad: More resistant to jamming and interference than TDMA and FDMA
Dis: Equipment cost is higher