Wireless Network and Mobile Communication : Mid Sem Examination ( 5th Sem )

Wireless Network and Mobile Communication

Mid Semester Examination, 2022-23
B. Tech - Semester : 05
Time : 1.30 hrs. - Max. Marks : 40

Instructions:

1. All questions are Compulsory
2. Assume missing data suitably, if any.

Section : A ( 2 x 2 = 4 Marks )

All questions are compulsory

1. Describe at least 4 different wireless technology with their respective coverage area.
2. What is frequency reuse and how it is realized in cellular mobile communication system?

Section : B ( 4 x 2 = 8 Marks )

All questions are compulsory

1. Explain three modes of EM wave propagation.
2. Explain the concept of clustering with suitable diagrams and formulae.

Section : C ( 6 x 2 = 12 Marks )

All questions are compulsory

1. Describe two-ray ground reflection model with relevant sketches and formulae.
   
   OR
   What is multigraph propagation? Discuss the terms coherence bandwidth, delay spread, doppler spread and coherence time as an impact of multigraph fading.
2. Describe the types of techniques for improving coverage and capacity in cellular systems.
   
   OR
   Draw the frequency reuse pattern for N=7. Also show co-channels in clusters.

Section : D ( 8 x 2 = 16 Marks )

All questions are compulsory

1. Does the operating frequency affect the propagation model? If yes, give example of any model to show it is true.
   
   OR
   Describe Okumara Model in detail.
2. Establish the relationship between cluster-size & co-channel reuse ratio. Further, show how it impacts the SIR.
   
   OR
   Establish the relationship between cluster-size & co-channel reuse ratio. Further, show how it impacts the system capacity.

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