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