Exercise: Communication Systems
Questions for: Communication Systems
A source has two symbols x1 and x2 with probabilities pi and pr. If a new source with four symbols is generated from the above source, the new symbol probabilities will be (∈ is a number such that 0 < ∈ < 1)
A:
p1, p2, p1, p2
B:
p1, p1, p2, p2
C:
(1 - ∈)p1, (1 - ∈) p2, p1, p2
D: 
Answer: C
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If a source of information generates messages at the rate of r messages per second and H is entropy, the information rate is
A: 
B: 
C:
rH
D: 
Answer: C
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The purpose of source coding is to
A:
increase the information transmission rate
B:
decrease 
ratio
ratioC:
decrease the information transmission rate
D:
decrease probability of error
Answer: B
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If k is Boltzmann's constant, T0 is standard ambient temperature, δf is bandwidth of receiver, F is noise figure, the minimum receivable signal in a radar receiver is given by
A:
k T0(δf)(F)
B:
k T0(δf)(F - 1)
C: 
D:
none of the above
Answer: B
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