GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Code: 2171004
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VII(NEW) EXAMINATION — SUMMER 2019Subject Name: Wireless Communication
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) Define: (1) Control Channel (2) Mobile Switching Center (3) Full Duplex Systems | 03 |
| (b) With figure explain Frequency Reuse concept in detail. | 04 | |
| (c) Define cluster size and write the equation for system capacity. | 07 | |
| Q.2 | (a) Explain handoff scenario at cell boundary with figure. | 03 |
| (b) Describe co channel interference and adjacent channel interference. | 04 | |
| (c) Explain the concept of trunking and grade of service. | 07 | |
| OR | ||
| (a) Explain sectoring to improve coverage and capacity of a system. | 07 | |
| (b) Explain :(1) Cell splitting (2) Microcell Zone concept To improve coverage and capacity of a system. | 03 | |
| (c) Explain three basic propagation mechanisms. | 04 | |
| Q.3 | (a) Explain the factors influencing small scale fading. | 07 |
| (b) Explain ground reflection (Two-ray) Model with figure and derive the equation for Electric Field E total. | 03 | |
| OR | ||
| (a) Explain Doppler Shift with equation. | 04 | |
| (b) Explain small scale fading(based on time delay spread) | 07 | |
| (c) Explain Spread spectrum channel impulse response measurement system with diagram. | 03 | |
| Q.4 | (a) Explain Frequency Division Multiple Access(FDMA) in wireless communication with figure. | 04 |
| (b) Explain small scale fading( based on Doppler spread) | 07 | |
| (c) Explain direct RF channel impulse response measurement system with diagram. | 03 | |
| OR | ||
| (a) If a total of 33 MHz of band width is allocated to a particular FDD cellular telephone system which uses two 25 KHz simplex channels to provide full duplex voice and control channels, compute the number of channel available per cell if a system uses: (1) four cell reuse (2) seven cell reuse and (3) 12 cell reuse | 04 | |
| (b) Explain Time Division Multiple Access (TDMA) in wireless communication with figure. | 07 | |
| (c) Draw GSM system architecture and explain its working principle in detail. Calculate the Brewster angle for a wave impinging on a ground having a permittivity of &;-4 | 03 | |
| Q.5 | (a) Consider a transmitter which radiates a sinusoidal carrier frequency of 1850 MHZ. For a vehicle moving 60 mile per hour, compute the received carrier frequency if the mobile is moving (1) Directly toward the transmitter (2) directly away from the transmitter and (3) in a direction which is perpendicular to the direction of arrival of the transmitted signal. | 04 |
| OR | ||
| (a) Explain: (1) static channel assignment strategy (2) dynamic channel assignment strategy | 07 | |
| (b) Write a short note on 3G W-CDMA(UMTS) | 03 | |
| (c) With diagram explain various 2.5 G and 3G upgrade paths for the major 2G technologies. | 07 |
Date: 16/05/2019
Total Marks: 70
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