Which of the following is true of Link 16 spread spectrum processing? Select all that apply.

Homework Help: Questions and Answers: Which of the following is true of Link 16 spread spectrum processing? Select all that apply.

a) Uses a 3MHz pulse width
b) Each chip of each pulse is transmitted at full power (normally 200w)
c) Covers the entire 51 frequency bandwidth
d) Decreases the power transmitted over any single frequency

Answer:

First, let’s understand what spread spectrum processing is: It’s a technique that spreads a signal over a wider frequency band than the information to be transmitted normally requires. This is done to make the signal more resistant to interference and harder to intercept.

Link 16 is a military tactical data link network that uses Time Division Multiple Access (TDMA) to share information among participants. Spread spectrum is used to distribute the signal over a wide frequency band to improve resistance to interference and jamming.

Given Options: Step by Step Answering

a) Uses a 3 MHz pulse width

• Link 16 uses spread spectrum techniques that distribute the signal over multiple frequencies. However, it operates over a much larger frequency band (960-1215 MHz). A fixed 3 MHz pulse width doesn’t directly align with how Link 16 handles frequency spreading.
• This statement is incorrect.

b) Each chip of each pulse is transmitted at full power (normally 200W)

• In spread spectrum, signals are transmitted over a wide frequency range, and each small piece of data (chip) is transmitted at the system’s designated power. This suggests that each chip is indeed transmitted at the full available power of the system.
• This statement is correct.

c) Covers the entire 51 frequency bandwidth

• Link 16 uses a frequency-hopping technique over 51 discrete frequencies. This implies that it covers the entire frequency set it is allowed to use during operation.
• This statement is correct.

d) Decreases the power transmitted over any single frequency

• Spread spectrum systems do not concentrate power on a single frequency; instead, they distribute the power across the available bandwidth. This decreases the power concentration on any one frequency, making it less susceptible to jamming.
• This statement is correct.

Final Answer:

Based on the above analysis, the correct answer is:

b) Each chip of each pulse is transmitted at full power (normally 200W)
c) Covers the entire 51 frequency bandwidth
d) Decreases the power transmitted over any single frequency

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