B.TECH - Semester 8 wireless communications Question Paper 2013 (apr)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Differentiate diffraction and scattering.
- Compare fast fading and slow fading.
- What is meant by wireless local loop?
- Describe the effect of using two house hold cordless phones at the same time.
- Explain the functions of control channel in mobile system.
- Suggest methods to improve coverage in cellular systems.
- How do you quantify grade of service in a telephone system?
- Explain connection less routing in wireless networks.
- What are LEOs, MEOs, and GEOs.
- Briefly explain GPS system. ( $10 \times 2=20$ Marks) P.T.O. Answer any one full question from each module. Each question carries 20 marks.
- (a) Compare FDD and TDD duplex systems. 5
- (b) With a block schematic explain the working of wide area paging system. 7
- (c) Discuss different generations of cellular systems. 8
- (a) Explain WiMAX technology.
- (b) Explain Bluetooth and ZigBee.
- (a) Explain the frequency reuse concept of cellular system and explain the effect of co-channel interference.
- (b) Prove that for a hexagonal geometry, the co-channel reuse ratio is given by $Q=\sqrt{3 N}$ where $N=i^{2}+i j+j^{2}$.
- (a) Draw and explain the frame format of GSM. What are the different physical and control channels in GSM.
- (b) If a total of 33 MHz of bandwidth is allocated to a particular FDD cellular telephone system which uses two 25 kHz simplex channels to provide full duplex voice and control channels. If 1 MHz of the allocated spectrum is dedicated to control chan...
- (a) With suitable diagram explain the knife edge diffraction model of mobile radio propagation.
- (b) In the following geometry, determine the fresnel diffraction parameter and approximate loss due to knife edge diffraction at operating frequency of 900 MHz . OR
- (a) Explain different types of small scale fading in wireless systems.
- (b) What are MIMO systems? Explain how MIMO systems combat multipath fading?
- (a) Describe OFDM system with a neat block diagram. 10
- (b) Explain different types of spread spectrum multiple access system.
- (a) Describe the features of Cellular Digital Packet Data(CDPD) service. 10
- (b) With a block diagram explain the functions of a satellite earth station. ( $4 \times 20=80$ Marks)