Wireless Network - May 2015
Electronics & Telecomm. (Semester 8)
TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) Compare WAP and internet protocol stacks.(5 marks) 1 (b) Compare CSMA-CD and CSMA-CS protocols.(5 marks) 1 (c) Give definitions of scatter net, MAC address, parked units, sniff and hold mode.(5 marks) 1 (d) Draw and explain neat diagram of components of sensor nodes.(5 marks) 2 (a) Describe in detail LR-WPAN device architecture with suitable diagam.(10 marks) 2 (b) Draw the spectrum of ultra wide band signal compared to Wi-Fi 802.11 a signal, also explain radio frequency identification in detail.(10 marks) 3 (a) Give the detailed radio Access Network Overview. Explain in detail functions of Node B and RNC also draw UTRAN logical architecture.(10 marks) 3 (b) What is adaptive multirate (AMR) coded? Comment on Quality of service in UMTS with respect to Qos attributes.(10 marks) 4 (a) Calculate the uplink cell load factor and number of voice users for a WCDMA system using the following data. What is the pole capacity of the cell?
|-Information rate (Ri)||=12.2 kbps|
|-Chip rate (Rc)||=3.84 mcps|
|-Required Eb/N||=4 dB|
|-Required interference margin||=3 dB|
|-Interference factor due to other cells||=0.5|
|-Channel activity factor||=0.65|
Write short notes on:
7 (a) HSDPA(5 marks) 7 (b) Rake Receives(5 marks) 7 (c) 802.11 standard of wireless LAN(5 marks) 7 (d) WiMax(5 marks)