To transmit N signals each band limited to fm Hz by time division multiplexing will require a minimum bandwidth of 

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VSSC ISRO Technical Assistant Electronics 8 Feb 2015 Official Paper
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  1. fm
  2. 2fm
  3. N fm
  4. fm/N

Answer (Detailed Solution Below)

Option 3 : N fm
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Formula: For Time division multiplexing (TDM) minimum Band width is given by-

\(\left(B.W\right)_{min}=\dfrac{R_b}{2}\)

Where, Rb = Nnfs

N = No. of signals

n = no. of Bit

fs = sampling frequency = 2 × fm

fm = msg signal Bandwidth

\(\left(B.W\right)_{min}=\dfrac{Nn2f_m}{2}=Nnf_m\)

Solution:

Given:

N signal with fm Bandwidth.

TDM minimum B.W = Nnfm

Assume n = 1 Bit

BWmin = Nfm
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