Define the following terms regarding wireless communication: Half duplex channel, Base station, Mobile Switching Center
[3 marks]Explain coherence bandwidth.
[4 marks]Compare Wi-Fi and Wi-MAX system parameters
[7 marks]Define large scale propagation model.
[3 marks]Assume a receiver located 10 km from a 50 Wtransmitter .The carrier frequency is 900MHz. Free space propagation is assumed. Gt=1 and Gr=2. Find the power at the receiver.
[4 marks]Derive an expression for a ground reflection model assuming distance between transmitter and receiver antenna is very large compare to heights of the antennas.
[7 marks]Discuss the Okumura’s prediction method with necessary equations.
[7 marks]Explain TDMA/FDD and FDMA/FDD.
[3 marks]Explain the following terms with respect to wireless networks:
[4 marks]Frequency Reuse (ii) Co-channel interference (iii) handoff (iv) Umbrella cell approach
[ marks]Calculate the worst case carrier to interference ratio for a mobile receiver located at the boundary of its serving cell if it is under the influence of interfering signals from two nearest co-channels cells in a cellular system. Assume 3-sectors per cell and a reuse pattern of 4.
[7 marks]Why is hexagonal cell shape preferred over square or triangular cell shape to represent the cellular architecture.
[3 marks]Explain the concept of Cell splitting in detail with figure.
[4 marks]Discuss the fixed channel allocation, Channel borrowing and dynamic channel allocation techniques in cellular systems.
Define mean excess delay, rms delay spread and excess delay spread.
[3 marks]Describe the factors influencing small scale fading.
[4 marks]Explain the following diversity techniques briefly: 1. Space diversity techniques 2. Frequency diversity techniques
[7 marks]What is diversity?
[3 marks]Describe the concept of Doppler effect with relevant mathematical expressions.
[4 marks]Describe the types of small scale fading based on multipath time delay spread only.
[7 marks]Discuss the concept of spread spectrum.
[3 marks]What is a non linear effect in FDMA?
[4 marks]Explain in brief: (i) Wi - Fi (ii) Wi Max
[7 marks]List the security issues of wireless networks
[3 marks]Write a short note on Bluetooth.
[4 marks]Describe RAKE receiver in CDMA.
[7 marks]