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SEVENTH SEMESTER [B.TECH] NOVEMBER-DECEMBER 2019 END TERM EXAMINATION Paper Code: ETEC-405 Time: 3 Hours Subject: Wireless Communication Maximum Marks: 75 Note: Attempt any five questions including Q. No. 1 which is compulsory. Assume missing data if any. Q1 (a) What are the limitations of conventional mobile telephone system. (b) Explain basic requirements required for establishing WLAN. (c) Explain the concept of Frequency reuse. (d) Explain HLR and VLR. (e) Explain why GEO is not preferred over GSM satellite. Q2 (a) Draw the block diagram of PCS architecture and explain it. (6.5) (b) Calculate the spectral efficiency (ns) if the bandwidth is 684 Kbps and transmission data rate is 1.152 Mbps. (6) Q3 (a) Compare advantages and disadvantages of different diversity schemes. (b) Compare 3G and 4G technology. (6.5) Q4 (a) Explain mobility management in GSM with block diagrams. (b) Explain multipath propagation in CDMA. (6.5) (b) Explain multipath propogation in CDMA (6) Q5 (a) A Spread sp

 END TERM EXAM - Wireless Communication (2018) 1 (a)  necessity of having large no of cell sites in a cellular system Coverage: Having a large number of cell sites ensures that the cellular network has good coverage, allowing users to make calls and use data services in a wide geographical area. Capacity: The number of cell sites directly affects the capacity of a cellular network. With a larger number of cell sites, more users can access the network at the same time, without experiencing congestion or dropped calls. Quality of Service: A large number of cell sites also allows for better control over the quality of service, as the network can prioritize traffic, allocate resources, and adjust call quality based on network conditions. 1 (b)  LMDS vs MMDs aplications of WLL technology Feature LMDS MMDS Frequency Band High Band High Band Range Short to medium Short to medium Capacity High Medium Data Rates High Low to medium Applications Fixed Wireless Access, Metropolitan Area Networki