STUPIDSID
1(a)
Explain the advantages of Software Defined Radio Communication Systems.
5 M
1(b)
Compare between FCA and DCA channel assignment strategies.
5 M
1(c)
What is Soft Handoff?
5 M
1(d)
What are the bandwidths and chip rates used in WCDMA and how they are compare with cdmaOne?
5 M
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
10 M
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)
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)
10 M
3(a)
Describe GSM trame structure.
10 M
3(b)
Why is power control used i cdma 2000 and WCDMA?
10 M
4(a)
Draw a neat diagram of UMTS system architectures with interfaces. Explain in details
10 M
4(b)
What is Multi path path Signal Propagation and Rake Receiver.
10 M
5(a)
Draw a neat diagram of LTE Network Architecture and explain in details.
10 M
5(b)
Why LTE uses OFDMA for DL & SC-FDMA (Single Carrier FDMA) for UL?
5 M
5(c)
How do we use space-time block code (STBC) and space-time trellis code (STTC)
5 M
6(a)
Compare between 3GPP/LTE Advanced LTE.
5 M
6(b)
Describe the Knife-edge Diffraction model.
5 M
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.
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.
10 M
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