1. Angular spread is a measure of how multipath concentrates about __________
a) Angle of arrival
b) Transmitted power
c) Single azimuthal direction of arrival
d) Received power
Explanation: The shape factor, angular spread is a measure of how multipath concentrates about a single azimuthal direction of arrival. It has several advantages like it is invariant under changes in transmitted power.
2. Angular constriction is a measure of how multipath concentrates about ______ azimuthal direction.
a) Single
b) Two
c) Three
d) Four
Explanation: The shape factor, angular constriction is a measure of how multipath concentrates about two azimuthal directions. The measure for angular constriction is invariant under changes in transmitted power
3. Shape factor, azimuthal direction of maximum fading is a directional parameter.
a) True
b) False
Explanation: Azimuthal direction of maximum fading is the third shape factor which is a directional or orientation parameter. Its value corresponds to the direction in which s mobile user would move in order to experience the maximum fading rate in the local area.
4. _______ of a stationary process is actually the variance of the rate of change.
a) Mean
b) Mean square
c) Mean squared derivative
d) Mean squared integral
Explanation: Mean squared derivative of a stationary process is actually the variance of the rate of change. The mean derivative of the stationary process is zero; the mean squared derivative is the simplest statistics that measures the fading rate of a channel.
5. Complex received voltage is a summation of __________ that have impinged upon receiver antenna.
a) Multipath waves
b) Waves
c) Power density
d) Single path waves
Explanation: Complex received voltage is a baseband representation. It us a summation of numerous multipath waves that have impinged upon the receiver antenna and have excited a complex voltage component at the input of a receiver.
6. Which of the following is equal to received power?
a) Square of complex voltage
b) Complex voltage
c) Magnitude of complex voltage
d) Magnitude squared of complex voltage
Explanation: The received power is equal to the magnitude squared of complex voltage. The mathematical operation of taking the squared magnitude of a complex quantity is a nonlinear operation.
7. Which of the following is equal to received envelope?
a) Square of complex voltage
b) Complex voltage
c) Magnitude of complex voltage
d) Magnitude squared of complex voltage
Explanation: The received envelope is equal to the magnitude of the complex voltage. The channel is assumed to be Rayleigh fading in order to calculate the mean squared fading rate
8. Which of the following describes the average fading rate within a local area?
a) Angular spread
b) Angular constriction
c) Azimuthal direction of maximum fading
d) Angle of arrival
Explanation: Angular spread describes the average fading rate within a local area. The average of the two fading rate variances, regardless of the orientation of the measurement, is always given by averaging the variances observed over two perpendicular directions within the local area.
9. Angular constriction affects the average fading rate within local area.
a) True
b) False
Explanation: Angular constriction does not affect the average fading rate within local area. It describes the variability of fading rates taken along different azimuthal directions.
10. Which is the process of encoding information from a message source in suitable manner for transmission?
a) Modulation
b) Demodulation
c) Encryption
d) Decryption
Explanation: Modulation is the process of encoding information from a message source in suitable manner for transmission. It translates the baseband message signal to a bandpass signal at frequencies that are very higher compared to the baseband frequency.