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WorksheetsModulation
Total questions: 10
Worksheet time: 11mins
In PCM the quantization noise depends on
sampling rate
signal strength
number of quantization levels
none of the above
Quantization noise occurs in
FSK
PCM
QPSK
None of above
The modulation method that represents bits as different phase shifts of a carrier is known as
(a)
The number of different phase shifts used in QPSK are
(a)
16QAM technique is based on .......... and ............parameters of carrier signal
amplitude
phase
frequency
In FSK the frequency of sinusoidal carrier is shifted between .......... discrete values, in response to value of digital signal
1
2
3
4
In FSK demodulator, envelope detector are simple (a) which rectify and filter their inputs to generate a dc voltage proportional to ac input.
The baud rate and bit rate for these systems are same
ASK
BFSK
BPSK
QPSK
64QAM
Let us assume using QAM we want to transmit a symbol consisting of 4 bits . So how many different possible symbol can we have
4
8
16
32
64
32QAM technique is based on .......... and ............parameters of carrier signal
amplitude
frequency
phase
