Wireless Communication - May 2016

Electronics and Comm. Engg. (Semester 7)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) What is ZigBee? Explain in details ZigBee networks.(7 marks) 1 (b) Compare Wi Fi and Wi Max technologies.(7 marks) 2 (a) Describe evolution of 1G, 2G and 3G mobile phone systems.(7 marks)

Solve any one question from Q2(b) & Q2(c)

2 (b) Explain the antenna design systems for mobile networks.(7 marks) 2 (c) With respect to mobile networks, explain co channel and adjacent channel interference.(7 marks)

Solve any two question from Q3(a), Q3(b) & Q3(c), Q3(d)

3 (a) Describe in details GSM architecture with necessary block diagram and its various blocks.(7 marks) 3 (b) Explain GSM network's hexagonal cellular concept and frequency reuse concept.(7 marks) 3 (c) Enumerate various radio propagation model and explain any two of them.(7 marks) 3 (d) Describe empirical formula for path loss in mobile networks.(7 marks)

Solve any two question from Q4(a), Q4(b) & Q4(c), Q4(d)

4 (a) What is fading? List and explain various types of small scale fading.(7 marks) 4 (b) Describe various GSM logical and physical channels.(7 marks) 4 (c) Write a short note on mobile portability.(7 marks) 4 (d) What is hand over in GSM? Give comparison of hard hand over and soft hand over.(7 marks)

Solve any two question from Q5(a), Q5(b) & Q5(c), Q5(d)

5 (a) Describe RAKE receiver in CDMA.(7 marks) 5 (b) Write a short note on software defined radio.(7 marks) 5 (c) What is the difference between 2G, 2.5G and 3G? Describe GPRS architecture.(7 marks) 5 (d) Compare CDMA forward and reverse channel.(7 marks)