WIRELESS COMMUNICATION (18TE72)

WIRELESS COMMUNICATION

Course Code : 18TE72
CIE Marks : 4O
Lecture Hours/Week : 3
SEE Marks :60
Total Number of Lecture Hours : 40(08 Hrs / Module)
Exam Hours : O3
CREDITS — 03

Course Learning Objectives: The objectives of the course is to enable students to:

• Understand the concepts of propagation mechanisms in wireless channels from a physics standpoint.
• Analyze propagation model for simple channels involving two paths only using concepts studied from physics.
• Develop a statistical model for practical channels involving a multiplicity of propagation paths and their application in a cellular scenario.
• Application of Communication theory both Physical and networking to understand GSM and CDMA systems that handle mobile telephony.

Module-1

Mobile Radio Propagation — Large Scale Path Loss Introduction, Free Space Propagation Model, Relating Power to Electric Field, Three Basic Propagation Mechanisms — Reflection (Ground Reflection), Diffraction, Scattering, Practical Link Budget, Outdoor Propagation Models (Okumura — Hata Model only). (Chapter 4.1 — 4.10, Text 1) L1, L2, L3, L4

Module-2

Mobile Radio Propagation — Small Scale Fading and Multipath Small Scale Multipath Propagation, Impulse Response of Multipath Channel, Small Scale Multipath Measurements, Parameters of Mobile Multipath Channels, Types of Small scale Fading, Rayleigh and Rician Distributions, Statistical Models for Multipath Fading Channels. (Chapter 5.1 — 5.7, Text 1) The Cellular Concept — System Design Fundamentals Frequency Reuse, Channel Assignment Strategies, Handoff Strategies, Interference and System Capacity. Trunking and Grade of Service. (Chapter 3.2 — 3 .6,Text 1) L1, L2, L3

Module-3

Multiple Access Techniques for Wireless Communications Introduction to Multi-Access, Frequency Division Multi-Access, Time Division Multi-Access, Spread Spectrum Multi-Access, Space Division Multi-Access, PackeLRadio, Capacit§Lof Cellular systems. (Chapter 9.1 — 9.7, Text 1) Improving Coverage and Capacity in Cellular Systems (3.7, Text 1) L1, L2, L3, L4

Module-4

GSM — Global System for Mobile Communications: Historical Overview; System Overview — (Base Station Subsystem, Network and Switching Subsystem, Operating Support System), The Air Interface, Logical and Physical Channels —(Logical Channels, Mapping Between Logical and Physical Channels); Synchronization — (Frequency Synchronization, Time Synchronization, Timing Advance, Summary of Burst Structures); Coding — (Voice Encoding, Channel Encoding, Cryptography, Frequency Hopping); Equalizer, Circuit-Switched Data Transmission — (Establishing a Connection and Handover, Identity Numbers, Identification of a Mobile Subscriber, Examples for Establishment of a Connection, Examples of Different Kinds of Handovers); Services and Billing — (Available Services, Billing). General Packet Radio Service. (Chapter 24, Text 2) L1, L2, L3

Module-5

IS-95 and CDMA 2000 : System Overview, Air Interface — (Frequency Bands and Duplexing, Spreading and Modulation, Power Control, Pilot Signal), Coding — (Speech Coders, Error Correction Coding), Spreading and Modulation —(Long and Short Spreading Codes and Walsh Codes, Spreading and Modulation in the Uplink, Databurst Randomization and Gating for the Uplink, Spreading and Modulation in the Downlink), Logical and Physical Channels — (Traffic Channels, Access Channel, Pilot Channels, Synchronization Channel, Paging Channel, Power Control Subchannel, Mapping Logical Channels to Physical Channels), Handover. CDMA 2000 —History, 1x Mode, 3x Mode, 1xEV-DO (Chapter 25, Text 2) L1, L2, L3

Course outcomes: At the end of the course, the students will be able to:

1. Explain concepts of propagation mechanisms like Reflection, Diffiaction, Scattering in wireless channels.
2. Analyse signal received levels for simple channels involving two paths only and multipath propagation channels in a specific cellular scenario.
3. Develop a scheme for idle mode, call set up, call progress handling  and call tear down in a GSM cellular network.
4. Develop a scheme for idle mode, call set up, call progress handling and call tear down in a CDMA cellular network.
5. Describe multiple access techniques for wireless communications.

Question paper pattern:

• Examination will be conducted for 100 marks with question paper containing 10 filll questions, each of 20 marks.
• Each full question can have a maximum of 4 sub questions.
• There will be 2 full questions from each module covering all the topics of the module.
• Students will have to answer 5 full questions, selecting one full question from each module.
• The total marks will be proportionally reduced to 60 marks as SEE marks is 60.

TEXTBOOKS:
1. “Wireless Communications: Principles and Practice” Theodore Rappaport, 2nd Edition, Prentice Hall Communications Engineering and Emerging Technologies Series, 2002, ISBN 0-13-042232-0.
2. “Wireless Communications”, Andreas F Molisch, 2““1 Edition, John Wiley and Sons, 2011, ISBN: ISBN: 9780470741870 (H/B), ISBN: 9780470741863 (P/B)