91. As practical signals are time limited, they have infinite frequency bandwidth. Sampling of such signals lead to aliasing. To avoid aliasing, an anti-aliasing filter is used
92. In a PCM system, if we increase the quantization levels from 2 to 8, how do the relative bandwidth requirements vary?
93. Four signals g1(t), g2(t), g3(t) and g4(t) are to be multiplexed and transmitted g1(t) and g4(t) have a bandwidth of 4 kHz, and the remaining two signals have bandwidth of 8 kHz. Each sample requires 8 bit for encoding. What is the minimum transmission bit rate of the system?
94. Consider a Binary Symmetric Channel (BBC) with probability of error being p. To transmit a bit, say 1, we transmit a sequence of three 1s. The receiver will interpret the received sequence to represent 1 if at least two bits are 1. The probability that the transmitted bit will be received in error is
95. In a uniform quantizer, the quantization noise is
96. Obtain the phase states of the carrier when the bit stream 1001101100 is applied to a QPSK modulator
97. Which of the following modulation scheme requires minimum power for transmission?
98. The line code that has zero dc component for pulse transmission of random binary data is
99. In MSK, the difference between the higher and lower frequency is
100. Amplitude shift keying is not widely used, because
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