SAMPLE EXAMINATION QUESTIONS
The following questions are typical of those that will be used on IEEE WCET® certification examinations.
Q1. A mobile terminal moving at a speed of 30 m/sec is receiving a signal with a center frequency of 2 GHz, having a bandwidth of 5 MHz. The received signal has a delay spread of 2 µsec. The full Doppler spread of the received signal is approximately:
An answer key may be found at the end of this Appendix.
1. 0.5 MHz
2. 200 Hz
3. 400 Hz
4. 2.5 MHz
Q2. In a CDMA cellular system, the coverage region of a cell located in a dense urban environment at 5:00 PM (busy hour) is most likely to be:
1. the same as the coverage at 3:00 AM (dead hour) because transmit power remains the same.
2. the same as the coverage at 3:00 AM (dead hour) because propagation remains the same.
3. smaller than the coverage of 3:00 AM (dead hour) because of higher cell loading.
4. smaller than the coverage at 3:00 AM (dead hour) because of more signal fading due to more cars on the street.
Q3. To overcome the near-far-problem, the CDMA implementation for cellular telephony uses:
1. signal spreading.
2. power control.
3. codeword orthogonality.
4. frequency re-use.
Q4. The choice of a duplexing method depends on the:
1. chosen multiple access technology.
2. nature of the available spectrum and of the traffic in uplink/downlink.
3. modulation type and error-correction statistics.
4. modulation type and the multiple access technology.
Q5. Fourth-generation (4G) standards are being developed under the umbrella of the ITU using which of the following names?
1. IMT-2000 (International Mobile Telecommunications 2000)
2. FPLMTS (Future Public Land Mobile Telecommunication System)
3. IMT-Advanced (International Mobile Telecommunications — Advanced)
4. LTE (Long Term Evolution)
Q6. In 802.11 using RTS/CTS as an access scheme where the duration of RTS, CTS, and an ACK are all equal to T, the Short Interframe Spacing duration equals S and the data packet duration of the transmitting source is D, the total period allocated to the transmitting terminal and no others is:
Q7. The relationship among the IEEE 802.11 timing parameters is:
Q8. Consider a receiver with an effective noise temperature of 33° C (306 K) and a 7-kHz bandwidth. Boltzmann’s constant is 1.38 × 10–23 Joules/degree K. The equivalent thermal noise of the receiver input is:
1. –135.3 dBW
2. –173.7 dBW
3. –165.3 dBW
4. –203.7 dBW
Q9. A fundamental architectural difference between Mobile IPv4 and Mobile IPv6 is that:
1. Mobile IPv6 does not require Home Agent (HA).
2. Mobile IPv4 dynamic home agent discovery returns a single reply to the mobile node.
3. Mobile IPv6 provides secure but less optimized routes than Mobile IPv4.
4. Mobile IPv6 does not require Foreign Agent (FA).
Answers: Q1 – 3; Q2 – 3; Q3 – 2; Q4 – 2; Q5 – 3; Q6 – 2; Q7 – 1; Q8 – 3; Q9 – 4
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