MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Wireless & Mobile Communications Questions & Answers Modulation Performance in Fading and Multipath Channels knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A rake receiver uses multiple ______ |
| A. | Delay circuits |
| B. | Correlators |
| C. | Detectors |
| D. | Flip flops |
| Answer» C. Detectors | |
| 2. |
Doppler spread refers to _________ |
| A. | Signal fading due to Doppler shift in the channel |
| B. | Temporary failure of message transfer |
| C. | Large coherence time of the channel as compared to the delay constraints |
| D. | All of the mentioned |
| Answer» B. Temporary failure of message transfer | |
| 3. |
Coherence time refers to ____________ |
| A. | Time required attaining a call with the busy base station |
| B. | Time required for synchronization between the transmitter and the receiver |
| C. | Minimum time for change in magnitude and phase of the channel |
| D. | None of the mentioned |
| Answer» C. Minimum time for change in magnitude and phase of the channel | |
| 4. |
Which of the following do not impact bit error rate in mobile communication systems? |
| A. | Mobile velocity |
| B. | Channel delay spread |
| C. | Modulation format |
| D. | Base station |
| Answer» E. | |
| 5. |
High capacity mobile systems are interference limited. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
The performance of BPSK is best is term of BER because _______ |
| A. | Symbol offset interference does not exist |
| B. | Existence of cross rail interference |
| C. | No multipath delay |
| D. | Doppler spread |
| Answer» B. Existence of cross rail interference | |
| 7. |
Irreducible BER floor is created in non frequency selective channels due to ____________ |
| A. | Intersymbol interference |
| B. | Multipath time delay |
| C. | Time varying Doppler spread |
| D. | Blind speed |
| Answer» D. Blind speed | |
| 8. |
Irreducible BER floor is created in frequency selective channels due to ____________ |
| A. | Intersymbol interference |
| B. | Random spectral spreading |
| C. | Time varying Doppler spread |
| D. | Blind speed |
| Answer» B. Random spectral spreading | |
| 9. |
Which of the following is specified by a specific number of bit errors occurring in a given transmission? |
| A. | Bit error rate |
| B. | Equally likely event |
| C. | Outage event |
| D. | Exhaustive events |
| Answer» D. Exhaustive events | |
| 10. |
Bit error rate provides the information about the type of error. |
| A. | True |
| B. | False |
| Answer» C. | |