Digital Communication Modulation Techniques Worksheet

Which modulation technique is most resistant to noise?

• BPSK

• QPSK

• QAM

• BFSK

What is the primary cause of ISI in digital communication?

• Multipath propagation

• Noise

• Filtering

• Modulation

What is the primary advantage of using a raised cosine filter in a digital communication system?

• Increased bandwidth efficiency

• Reduced ISI

• Improved noise immunity

• Simplified implementation

In BPSK, the carrier wave is modulated by changing its:

• Amplitude

• Frequency

• Phase

• None of the above

QPSK modulation technique uses:

• QPSK uses four different phase shifts to represent data.

• QPSK uses two different frequencies to represent data.

• QPSK uses amplitude variations to represent data.

• QPSK uses time division to represent data.

A BPSK system is operating at a data rate of 100 kbps. What is the minimum bandwidth required for transmission?

• 50 kHz

• 100 kHz

• 200 kHz

• 400 kHz

BFSK modulation technique uses:

• 2 frequencies

• 4 frequencies

• 8 frequencies

• 16 frequencies

What is the effect of ISI on digital communication?

• Increased error rate

• Decreased error rate

• No effect

• Increased bandwidth

Which of the following is a technique to mitigate ISI?

(a)  

ICI stands for:

• Inter-Channel Interference

• Inter-Carrier Interference

• Inter-Symbol Interference

• None of the above