Anna University Questions papers - Electrical Engineering

2011 Anna University Chennai, B.E Electrical and Electronics Engineering B.E/B.Tech. Degree Examination, April/May 2011, Eight semester, Electrical and Electronics Engineering, EC1451A – MOBILE COMMUNICATION Question paper:


Part-A
(10*2=20)

1. Define trunking efficiency and Grade of Service.
2. Define coherence bandwidth.
3. Distinguish between soft and hard handoff.
4. What are the advantages of the two ray ground reflection model in the analysis of path loss?
5. What is Doppler shift?
6. Distinguish linear and non-linear equalization.
7. Define CDMA.
8. What are the criteria for choosing speech codec for mobile communication?
9. What is the operating frequency range of Bluetooth devices?
10. Define GSM.


Part-B
(5*16=80)

11.(a) With suitable timing diagram, explain how a call is made between cellular users.(16)
Or

(b)(i) Explain the frequency reuse concept in cellular technology.(8)
(ii) Explain the channel assignment strategy in cellular systems.(8)

12.(a)(i) Explain how the diffraction affects the signal propagation using knife edge diffraction model.(8)
(ii) Explain the propagation of signal in outdoor using Durkin's model.(8)
Or
(b) Explain the different techniques used for increasing the capacity and improving the coverage in cellular systems?

13. (a)(i) Explain the generation and detection of GMSK signal.(8)
(ii) Explain the RAKE receiver.(8)

Or
(b) Explain the advantages of diversity techniques in mobile communication. Explain space diversity technique in detail.(16)

14. (a) Compare the performance of FDMA,TDMA, CDMA in detail.(16)

Or
(b) What is vocoder? Explain the linear predictive coder in detail.(16)

15. (a)(i) Explain the architecture of GSM.

(ii) What are the various channels available in GSM. Explain each channel in detail.(8)

Or

(b)(i) Compare the 2G and 3G standards of mobile communication.(8)
(ii) Explain about DECT Technology.(8)