Selected Topics in Wireless Communications

Week 1

  • Introduction to Modern Wireless Communications

·         Slides (ppt) 

Week 2

  • Radio Wave Propagation. Large Scale Fading

·     Slides (ppt) 

Week 3

  • Radio Wave Propagation. Small- Scale Fading and Multipath
  • Slides (ppt) 

Week 4

  • Modulation Techniques for Mobile Radio
  • Slides (ppt) 

Week 5

  • Performace of Digital Modulation over Wireless Channel
  • Slides (pt) 

Week 6

  • Diversity
  • Slides (ppt) 

Week 7

  • Channel Coding
  • Slides (ppt) 

Week 8

  • Wireless MIMO Systems
  • Matrix Algebra
  • Slides (ppt) 

Week 9

  • OFDM. Basic Concept
  • Slides (ppt) 

Week 10

  • OFDM. Applications
  • Slides (ppt) 

Week 11

  • Spread Spectrum Technology
  • Slides(ppt) 

Week 12

  • CDMA based Networks
  • Slides (ppt)  

Week 13

  • CDMA Systems. Examples
  • Slides (ppt) 

 

 

 

 

 

 

 

 

Instructor: Dr. Sergey Fedoseev

E-mail: sergey@physicist.net

 

 

Objective:

This course is an overview on modern wireless communication technology. Some technology is discussed to give the students a general feel of the issues involved. The course will provide the students with a good summary understanding of background materials, reference data, latest offerings and industrial projections.

Overview:

The advanced transmission techniques of OFDM, applied in wireless LANs and in digital and video broadcasting, and CDMA, the foundation of 3G mobile communications, have been part of almost every communication system that has been designed in recent years, with both offering a high degree of flexibility in adjusting the system to the requirements of the application and to the impairments caused by the transmission channel. This course contains: Basics of digital transmission theory, a comprehensive overview of the underlying ideas of these techniques and their strengths and weaknesses under various conditions. The specific requirements of the mobile radio channel and their relevance for the design of digital transmission systems are discussed and related to the items of channel coding and modulation. Basics of digital communications, mobile radio channels, coding and modulation, OFDM as a multicarrier system and CDMA as an application of spread spectrum techniques. The most important mobile radio and digital broadcasting systems that use OFDM and CDMA,  the underlying ideas for the choice of system parameters. Progresses from the fundamentals of wideband communication through to modern applications.

Textbooks:

  • Andrea Goldsmith, Wireless Communications, Cambridge Univ Pr, 2005

·         Theodore S. Rappaport, Wireless Communications Principle and Practice, Second Edition, Prentice-Hall, 2002

 

Course Outline:

Basics of Digital Communications 
Orthogonal Signals and Vectors. Baseband and Passband transmission. The AWGN Channel. Detection of Signals in Noise. Linear Modulation schemes.

Mobile Radio Channel
Multipath Radio Channel. Characterization of Fading Channels Channel Simulation. Time variance and Doppler spread. Frequency selectivity and delay spread. Rayleigh and Ricean channels. Real-valued discrete-time fading channels. Digital Transmission over Fading Channel. Diversity for fading channels. Transmit antenna diversity.

Channel Coding
General Principles. Error probabilities. Concatenated coding. Convolutional Codes. MLSE for convolutional codes: the Viterbi algorithm. Reed-Solomon Codes.

OFDM

General Principles. The concept of multicarrier transmission. OFDM as multicarrier transmission. Implementation by FFT.  Implementation and Signal Processing Aspect for OFDM. Sensitivity of OFDM signals against nonlinearities. Synchronization and Channel Estimation Aspects for OFDM Systems. Time and frequency synchronization for OFDM systems. OFDM with pilot symbols for channel estimation. Interleaving and Channel Diversity for OFDM Systems. Requirements of the mobile radio channel. The diversity spectrum of a wideband multicarrier channel. Modulation and Channel Coding for OFDM systems. OFDM systems with convolutional coding and QPSK. Antenna Diversity for convolutionally Coded QAM multicarrier Systems. OFDM Systems Examples.WLAN systems

 

CDMA
General Principles of CDMA. The concept of spreading. Cellular mobile radio networks. Spreading codes and their properties. CDMA transmission Channel Models. Representation of CDMA signals. The discrete channel model for synchronous wideband MC-CDMA transmission. Receiver Structures for  Synchronous Transmission. Optimal receiver structures. Receiver Structures for  MC-CDMA and Asynchronous Widedband CDMA Transmission. Rake Receiver. CDMA Systems Examples. Wireless LANs according to IEEE 802.11. Global Positioning System. Wideband CDMA. cdma2000.

 

 

To buy this Course for $50