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MIMO WIRELESS COMMUNICATION
SYSTEMSBhaskar D. Rao
University of California, San DiegoLa Jolla, CA 92093-0407
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 ….
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)
Prerequisites
Course Grading Homeworks 40%
Theory and Matlab Project 25%
Presentation on day of Finals Exam 35%
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)
Space-Time Processing for Wireless Communications
Base station Base station
Mobile
Mobile
Mobile
Mobile
Mobile
Goal: Exploit the spatial dimension to improve capacity and quality of network
Variants of Multiple Antenna Systems
Terminology
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
Technical Rationale Spatial Diversity to Combat Fading Spatial Signature for Interference Suppr
ession Array Gain enables Lower Power Consu
mption Multiple Transmit Antennas provide
Transmit Diversity Capacity Improvements using Spatial M
ultiplexing
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
Beamforming
Antenna Array
Interferer
Interferer
Interferer
DesiredUser
Multi-Input Multi-Output System
Capacity of MIMO systems
Role of Diversity
Two Fading Channels combined to improve SNR: Diversity gain
Spatial Diversity to Combat Fading