Question Paper: Mobile Communication Question Paper - December 2016 - Electronics and Telecom Engineering (Semester 7) - Mumbai University (MU)
Mobile Communication - December 2016
MU Electronics and Telecom Engineering (Semester 7)
Total marks: 80
Total time: 3 Hours
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary
1(a) Explain the advantages of Software Defined Radio Communication Systems.
1(b) Compare between FCA and DCA channel assignment strategies.
1(c) What is Soft Handoff?
1(d) What are the bandwidths and chip rates used in WCDMA and how they are compare with cdmaOne?
2(a) Consider a cellular system with S/I ratio of 18 dB. The frequency reuse factor is N = 7, calculate the worst case for signal-to-co channel interference ratio. It is the frequency rcuse factor 7 still being acceptable? If not, what is it? Assume path-loss exponent as 4 in a mobile radio environment
2(b) With respect to trunking theory describe following terms: i) Busy Hour ii) Traffic Intensity A, iii) Average call arrival rate & Average call duration H. iv) Erlang-B System & Erlang-C System. v) Trunking efficiency & Grade of Service(GOS)
3(a) Describe GSM trame structure.
3(b) Why is power control used i cdma 2000 and WCDMA?
4(a) Draw a neat diagram of UMTS system architectures with interfaces. Explain in details
4(b) What is Multi path path Signal Propagation and Rake Receiver.
5(a) Draw a neat diagram of LTE Network Architecture and explain in details.
5(b) Why LTE uses OFDMA for DL & SC-FDMA (Single Carrier FDMA) for UL?
5(c) How do we use space-time block code (STBC) and space-time trellis code (STTC)
6(a) Compare between 3GPP/LTE Advanced LTE.
6(b) Describe the Knife-edge Diffraction model.
6(c) In a celular system. If carrier frequency fc=900MHz an mobile velocity is 70km/hr. Compare the received carrier frequency if the mobile is moving i) directly towards the transmitter, ii) directly away from the transmitter iii) In a direction which is perpendicular to the direction of arrival of the transmitted signal.