Question 1

What type of transmission medium are commonly used for baseband transmission and for passband transmission ?

Question 2

Encode the bit-pattern 1010000101 using the following digital encoding schemes. Be sure to write down any assumptions you need to make:

a. NRZI
b. Manchester

c. AMI

Question 3

A periodic composite signal with a bandwidth of 2000 Hz is composed of two sine waves. The first one has a frequency of 100 Hz with maximum amplitude of 20 V; the second one has maximum amplitude of 5 V. Draw the frequency domain graph.

Question 4

1- Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is _________ that of A.

a. One-half
b. Twice
c. The same as
d. Indeterminate from

2- What is the bandwidth of a signal that ranges from 40 KHz to 4 MHz?

1. 36 MHz

2. 360 KHz

3. 3.96 MHz

4. 396 KHz

3- In _______encoding, we use three levels: positive, zero, and negative.

a. unipolar
b. bipolar
c. polar
d. none of the above

4- ASK, PSK, and FSK are examples of ________ modulation.

a. Digital-to-digital

b. Digital-to-analog

c. Analog-to-analog

d. Analog-to-digital

5- Modulation of an analog signal can be accomplished through changing the_______ of the carrier signal.

a. Amplitude
b. Frequency
c. Phase
d. Any of the above

6- What are the channel conditions for a successful baseband transmission

1. Bandpass with narrow bandwidth

2. Bandpass with wide bandwidth

3. Low-pass with narrow bandwidth

4. Low-pass with wide bandwidth