Calicut University 2006 B.Tech Electronics and Communications Engineering WIRELESS MOBILE COMLMUNICATION - Question Paper

C 20275
EIGHTH SEMESTER B.TECH. (ENGINEERING) DEGREE
EXAMINATION, JUNE 2006
EC 2K 805 A-WIRELESS MOBILE COMLMUNICATION
Time : 3 Hours]
Maximum : 100 Marks
ans all questions:
1. (a) What is meant by coherence bandwidth ? provide the expression.

(b) List the kinds of small-scale fading.

(c) Write the concept of polarization diversity.

(d) Write the concept of equal gain combining technique.

(e) What is meant by near4ar effect ? discuss.

(f) Write the concept of can splittug.

(g) Define jamming margin and provide the expression.

(h) Write the concept of time hopped spread spectrum systems.

(8 x five = 40 marks)

2. (a) Derive the expression for the power received in 2-ray ground reflection model.
Or
(b) Derive the impulse response model of a ltipath chance.(15 marks)

3. (a) Derive the improvement offered by selection diversity combining.
Or
(b) Discuss the concept of RAKE receiver with neat diagram.(15 Marks)

4. 1 a i Explain how does 0e31 sectoring imlxvre capacity in cellular system.
Or
(b) What is meant by adjacent channel interference ? How is it decreased in cellular systems ?(15 marks)

5. (a) Derive the expression for processing gain in direct-sequence spread spectrum system.
Or
(b) Discuss the spnchronisatioo techniques used in spread spectrum system.(15 marks)

Earning:   Approval pending.