Question

YEAR III SEMESTER II CAT FOR BSC EEE EES 312: COMMUNICATION SYSTEMS (a) The binary sequence 11100101 is applied to a DPSK system. The bit duration is 1uS. The carrier frequency is 6MHz. iii)) Calculate the transmission bandwidth of the system. (2 Marks) iv)) Plot the waveform of the transmitted signal. (6 Marks) (b) FSK transmission is used to transmit 1200b/s digital signals over a telephone channel. The FSK signals are fit into the range 500 to 2900Hz. The carrier frequencies are taken to be 1200Hz and 2200Hz. a. Calculate the required modulation index (3 Marks) b. Calculate the required roll-off factor (3 Marks) c. Sketch the spectrum of the baseband signal (3 Marks) d. Sketch the spectrum of the transmission channel (positive frequencies only) (3 Marks)

          YEAR III SEMESTER II CAT FOR BSC EEE EES 312: COMMUNICATION SYSTEMS
(a) The binary sequence 11100101 is applied to a DPSK system. The bit duration is 1uS. The carrier
frequency is 6MHz.
iii)) Calculate the transmission bandwidth of the system.
(2 Marks)
iv)) Plot the waveform of the transmitted signal.
(6 Marks)
(b) FSK transmission is used to transmit 1200b/s digital signals over a telephone channel. The FSK
signals are fit into the range 500 to 2900Hz. The carrier frequencies are taken to be 1200Hz and
2200Hz.
a. Calculate the required modulation index
(3 Marks)
b. Calculate the required roll-off factor
(3 Marks)
c. Sketch the spectrum of the baseband signal
(3 Marks)
d. Sketch the spectrum of the transmission channel (positive frequencies only) (3 Marks)

YEAR III SEMESTER II CAT FOR BSC EEE EES 312: COMMUNICATION SYSTEMS
(a) The binary sequence 11100101 is applied to a DPSK system. The bit duration is 1uS. The carrier
frequency is 6MHz.
iii)) Calculate the transmission bandwidth of the system.
(2 Marks)
iv)) Plot the waveform of the transmitted signal.
(6 Marks)
(b) FSK transmission is used to transmit 1200b/s digital signals over a telephone channel. The FSK
signals are fit into the range 500 to 2900Hz. The carrier frequencies are taken to be 1200Hz and
2200Hz.
a. Calculate the required modulation index
(3 Marks)
b. Calculate the required roll-off factor
(3 Marks)
c. Sketch the spectrum of the baseband signal
(3 Marks)
d. Sketch the spectrum of the transmission channel (positive frequencies only) (3 Marks)

Added by Paul J.

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