81. In high speed TDM, the channels are separated in the receiver employing
82. Delta modulation and pulse code modulation have a threshold Pe, (Considering the impact of errors in various digits).
83. The bit rate of digital communication system is R kbits/s. The modulation used is 32-QAM. The minimum bandwidth required for ISI free transmission is
84. Five channels each with 100 kHz bandwidth are to be multiplexed together. What is the minimum bandwidth of the link, if three is a need of a guard band is a need of a guard band of 10 kHz between the channels to prevent interference?
85. Minimum Bandwidth required for Minimum Shift Keying (MSK)? Where fb is maximum frequency of baseband signal.
86. The criterion used for pulse shaping to avoid ISI is
87. Which signaling scheme is most affected by noise?
88. The received signal level for a particular digital system is -151 dBW and the effective noise temperature of the receiver system is 1500 K. The value of $$\frac{{{{\text{E}}_{\text{b}}}}}{{{{\text{N}}_0}}}$$ required for a link transmitting 2400 bps is:
89. PAM signals are constructed by using a low pass filter of pass band slightly greater than base band to avoid aliasing. This avoids distortion
90. The raised cosine pulse p(t) is used for zero ISI in digital communications. The expression for p(t) with unity roll-off factor is given by $$p\left( t \right) = \frac{{\sin 4\pi Wt}}{{4\pi Wt\left( {1 - 16{W^2}{t^2}} \right)}}.$$ The value of p(t) at $$t = \frac{1}{{4W}}$$ is
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