21. A signal m1(t) is band limited to 3.6 kHz and the three other signals m2(t), m3(t) and m4(t) are band limited to 1.2 kHz each, and these signals are transmitted by means of TDM. Then, what will be the transmission bandwidth of the channel.
22. The bit rate of a digital communication system is 16 Mbps. The modulation scheme is QPSK. The baud rate of the system is:
23. Which one of the following can be used for the detection of the non coherent BFSK signal?
24. The anti-aliasing filter has a higher cut-off frequency fm. Its output is sampled periodically every Ts seconds. For proper recovery of the signal at the receiver, Ts must be
25. For QPSK
26. In 512 QAM, the number of signal vectors of the signal constellation is:
27. In a certain '12 channel TDM' system, it is found that channel number 3 and channel number 8 are connected to the same input signal. The technique
28. The spectral efficiency and bandwidth of BPSK are . . . . . . . . and . . . . . . . . respectively.
29. The bit rate of digital communication system is M kbps. The modulation used is 16-QAM. The minimum bandwidth required for ideal transmission is . . . . . . . .
30. Hamming codes are used for error detection and correction. If the minimum Hamming distance is m, then the number of errors correctable is
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