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GATE 2019: Communication Quiz 9 (App update required to attempt this test)
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Question 1
In a code-division multiple access (CDMA) system with N = 8 chips, the maximum number of users who can be assigned mutually orthogonal signature sequences is ________
Question 2
9 signals, each is band limited to 3kHz are to be transmitted over a signal channel by frequency division multiplexing using AM-SSB modulation. The bandwidth of multiplexed signal is _______ kHz.
Question 3
The input to a linear delta modulator having a step–size 
is a sine wave with frequency 
and peak amplitude 
. If the sampling frequency 
, the combination of the sine–wave frequency 
and the peak amplitude, 
where slope overload will take place is
Question 4
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 
. The value of p(t) at 
is:
Question 5
10 voice signal band limited to 3.4 KHz is sampled at 8 KHz and pulse code modulated using 64 quantization levels. Ten such signals are time division multiplexed (TDM) using one 5-bit synchronizing word every alternate frame. The minimum channel bandwidth required for transmission of the TDM signal is______ kHz.
Question 6
Twenty four voice signals are sampled uniformly at a rate of 8 KHz and then time division multiplexed. The sampling process uses flat top samples with 1 Hs. Duration. The multiplexing operation includes provision for synchronization by adding and extra pulse of 1 us duration. The spacing b/w successive pulses of the multiplexed signal is
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