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  4. 12 signals each band limited to 5 kHz are to be transmitted by frequency-division multiplexer. If AM-SSB modulation guard band of 1 kHz is used then the bandwidth of multiplexed signal is

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Q. 12 signals each band limited to 5 kHz are to be transmitted by frequency-division multiplexer. If AM-SSB modulation guard band of 1 kHz is used then the bandwidth of multiplexed signal is

Communication Systems

Solution:

Total signal BW = $12 \times 5 = 60 \, kHz $
11 guard band are required between 12 signal
$ \therefore $ guard bandwidth =11 $ \times$ 1=11kHz
$\therefore $ total bandwidth = 60 +11= 71kHz