Wireless Communication — Summer 2025

Enlist the various functions of Mobile Switching Centre (MSC).

Define the following terms regarding wireless communication: (1) ISM bands (2) Diffraction (3) Set up channels (4) Multipath fading

Explain the different generations of wireless communication.

Why hexagonal cell shape is preferred over square or triangular cell shape to represent the cellular architecture.

Explain the Adjacent and Co channel interference with the help of example.

Define cell splitting. Explain how it is helpful to improve coverage and capacity in cellular systems.

Explain ground reflection (Two-ray) Model with figure and derive the equation for Electric Field E TOTAL, Path Difference(Δ), Phase Difference (θ ) and Time Δ Delay(τ ) d

Compare Wi-Fi with Wi-MAX technology.

Derive the expression for Feher’s upper bound.

By assuming cosine law and the hexagonal cell geometry, Prove that for a hexagonal geometry, the co-channel reuse ratio is given by Q = (3N)1/2, where N= i2 +j2 +ij

Explain the process by which CDMA system resolves near far problem.

Define the following terms. (1) GOS (2) RSSI (3) Forward channel (4) Umbrella cell

Discuss Hand off strategy and its types. Discuss the proper and improper handoff situations.1

What is the significance of Frequency Reuse concept?

Explain channel assignment strategies in brief.

Draw Global System for Mobile Communication (GSM) architecture with the help of block diagram. Discuss each block in brief.

Discuss the concept of spread spectrum.

Enlist and explain the factors influencing small scale fading.

Explain CDMA forward channel operation in detail.

Enlist the security issues of wireless networks.

State the important steps to establish the call in GSM.

Enlist various multiple access schemes used in wireless communications and explain FDMA in detail.

Compare flat fading and frequency selective fading.

Discuss about software defined radio.

Describe various GSM logical and physical channels.