MOBILE COMMUNICATION (EC-503 (B)) - Important Questions

Explain frequency reuse concept with the help of proper cellular diagram. Also draw a cellular system with 19-cell reuse and locate the co-channel cells for this system.

Illustrate the MAHO technique and queuing concept in handoff. Also explain the different types of handoff (hard, soft, etc.) in mobile communication.

Explain Clarke's model for flat fading, including fading statistics and level crossing rate.

Explain the ground reflection (two-ray) propagation model for mobile radio propagation.

Explain foliage losses and propagation in near-in-distance.

If the coherence bandwidth is calculated as 100 kHz in the given radio channel of 900 MHz frequency, calculate the maximum symbol rate that can be transmitted over this channel that will suffer minimal intersymbol interference.

Discuss the small scale multipath propagation.

List the various techniques used to expand the capacity of a cellular system and explain them.

Explain frequency management and channel assignment in cellular systems.

What are the sources/reasons of co-channel interference and how can it be reduced?

Explain the GSM system architecture with block diagram and functions of each sub-system, including interfaces.

Explain the GSM frame structure with neat diagram.

If Bt is 12.5 MHz, Bguard is 10 kHz and Bc is 30 kHz, find the number of channels available in an FDMA system.

Explain spread spectrum multiple access in detail.

Write short notes on any two of the following: (i) Frequency Hopped Multiple Access (ii) Forward and reverse channels in CDMA digital cellular system (iii) Doppler spread and coherence time.