71. Consider a binary digital communication system with equally likely 0's and 1's. When binary 0 is transmitted the detector input can lie between the levels -0.25 V and +0.25 V with equal probability: when binary 1 is transmitted, the voltage at the detector can have any value between 0 and 1 V with equal probability. If the detector has a threshold of 0.2 V (i.e., if the received signal is greater than 0.2 V, the bit is taken as 1), the average bit error bit error probability is
72. Which of the following is worst affected by Noise?
73. Which type of encoding is used in USB?
74. Which of the following pulse modulation are digital?
1. PCM
2. Differential PCM
3. PWM
Select the correct answer using the options given below:
1. PCM
2. Differential PCM
3. PWM
Select the correct answer using the options given below:
75. The Nyquist sampling rate for the signal $$s\left( t \right) = \frac{{\sin \left( {500\pi t} \right)}}{{\pi t}} \times \frac{{\sin \left( {700\pi t} \right)}}{{\pi t}}$$ is given by
76. The granular noise can be reduced by
77. Match List-I with List-II and select the correct answer as per the options:
List-I
List-II
a. RF band is divided into small frequency bands
1. TDMA
b. Store and forward system
2. FDMA
c. Spread spectrum multiple access
3. Navigation technique
d. Dead reckoning
4. CDMA
| List-I | List-II |
| a. RF band is divided into small frequency bands | 1. TDMA |
| b. Store and forward system | 2. FDMA |
| c. Spread spectrum multiple access | 3. Navigation technique |
| d. Dead reckoning | 4. CDMA |
78. In a band limited channel higher bit rate can be transmitted with
79. A message signal with its amplitude uniformly distributed between -2 V and +2 V is transmitted by a 8-bit binary PCM system. The (SNR)q would be
80. The bit error probability for GMSK is given by
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