A narrowband signal is to be transmitted a distance of 100
km over a wireline channel that has an attenuation of 1 dB/km. Assume that
noise equivalent bandwidthof each repeater is B = 4 kHz and that N0 = kT0 = 4
a. Using (4.76), determine the transmitted power Pt required
to achieve an SNR0 = 30 dB at the output of a receiver with a 5 dB noise
figure, if no relays are used.
b. Repeat the calculation when a repeater is inserted every
10 km in the wireline channel, where the repeater has a gain of 10 dB and a 5
dB noise figure.
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