GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (Old) EXAMINATION — WINTER 2019
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Subject Code: 171004 Date: 03/12/2019
Subject Name: Wireless Communication
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define following: (A)Control Channel (B)GOS (C) MAHO (D)Reverse Channel (E)Cluster (F)Page (G)FDD
(b) Explain the concept of Cell splitting and clustering with figure.
Q.2 (a) Differentiate between cell splitting and sectoring. Prove that the co-channel reuse ratio is given by , where N = i² + ij + j²
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(b) With respect to mobile networks, explain co channel and adjacent channel interference.
OR
(b) Explain the three basic propagation mechanisms which impact the propagation of signal in a mobile environment.
Q.3 (a) Compare the S/I ratio for a mobile radio for the following cases of cellular system with frequency reuse factor of 7 for (i) Omni directional antenna (ii) 120° Directional antennas.
(b) Derive an expression for the received power for a two-ray reflection point to point mobile communication propagation model. Assume path loss exponent n=4.
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OR
Q.3 (a) For a regular cellular structure with equal-size hexagonal cells, show that D/R= (21)*½, Where D is the minimum distance between the centers of adjacent cells and R is the radius of each cell. Assume 7-cell reuse pattern.
(b) Explain in detail the types of small scale fading (including time delay and Doppler spread).
Q.4 (a) Discuss in detail the signal processing in GSM including speech coding, channel coding (data & control channels).
(b) What is soft handoff? Explain in detail RAKE receiver with neat diagram.
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OR
Q.4 (a) Explain in detail the impulse response model of a multipath channel.
(b) Compare HSCSD and GPRS. Explain briefly GPRS.
Q.5 (a) Briefly Describe the functions of the following for GSM Systems.(i) MSC (ii)VLR (iii)HLR (iv)AUC (v) EIR.
(b) Comparison of TDMA and CDMA multiple Access Techniques in detail.
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OR
Q.5 (a) Discuss in details about architecture of UWB radio and its applications.
(b) Describe the wireless Ad-Hoc network with neat diagram.
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