Spread Spectrum

Question 1

What are spread spectrum techniques?

Answer 1

Methods whereby em energy generated in a particular bandwidth is deliberately spread in the frequency domain, giving wider bandwidth

Question 2

Why are spread spectrum techniques used?

Answer 2

For establishment of secure comms. This increases resistance to natural interference and jamming.

Question 3

What is process gain?

Answer 3

The performance increase for spread spectrum systems is referred to as proccesss gain.

Question 4

What happens to the power density with spread spectrum transmitters ?

Answer 4

Due to the width of spread spectrum signals they are transmitted at a much lower power density than narrow band signals

Question 5

Common types of spread spectrum ?

Answer 5

Direct sequence spread spectrum

Frequency hopping spread spectrum

Time hopping spread spectrum
Hybrid spread spectrum

Stacked carrier spread spectrum.