1. MIMO WIRELESS COMMUNICATION SYSTEMS Bhaskar D. Rao University of California, San Diego La Jolla, CA 92093-0407

2. Textbooks Introduction to Space-Time Wireless Communications, A. Paulraj, R. Nabar and D. Gore, Cambridge University Press Fundamentals of Wireless Communications, D. Tse and P. Vishwanath Space-Time Block Coding for Wireless Communications, E. G. Larsson and P. Stoica MIMO Wireless Communications, Edited by E. Biglieri, R. Calderbank ….

3. Prerequistive Classes Digital Communication (ECE 258A,B) Channel Coding (ECE 259A,B) Information Theory (ECE 255A) Statistical Signal Processing (ECE 251A) Array Processing (ECE 251D) Estimation Theory (ECE 275A,B)

4. Prerequisites

5. Course Grading Homeworks 40% Theory and Matlab Project 25% Presentation on day of Finals Exam 35%

6. Wireless Channel Characteristics Fading: Multiple Paths with different phases add up at the receiver resulting in a random path gain ISI : Paths with different delays causing intersymbol interference (Frequency Selective Channels) CCI : Co-Channel users create interference Noise : Thermal noise from electronics Doppler : Channel varies over time (mobility) Bandwidth : Bandwidth limited and so data rates can grow only as log(1 + SNR)

8. Space-Time Processing for Wireless Communications Base station Mobile Goal: Exploit the spatial dimension to improve capacity and quality of network

9. Variants of Multiple Antenna Systems

10. Terminology

11. Benefits of Space-Time Processing Increased Capacity Improved Signal Quality Increased Coverage Lower Power Consumption Higher Data Rates These requirements are often conflicting. Need balancing to maximize system performance

12. Technical Rationale Spatial Diversity to Combat Fading Spatial Signature for Interference Suppression Spatial Signature for Interference Suppression Array Gain enables Lower Power Consumption Array Gain enables Lower Power Consumption Multiple Transmit Antennas provide Transmit Diversity Capacity Improvements using Spatial Multiplexing Capacity Improvements using Spatial Multiplexing

15. Scenarios Base Station or Mobile Receive versus Transmit Antennas MIMO systems Choice of Multiple Access Scheme (CDMA or TDMA) Microcell versus Macrocell Mobility versus Fixed

17. Beamforming

18. Multi-Input Multi-Output System

19. Capacity of MIMO systems

20. Role of Diversity Two Fading Channels combined to improve SNR: Diversity gain

21. Spatial Diversity to Combat Fading