[ppt]smart antennas for wireless …dsp.ucsd.edu/~liwen/ece287a/intro.ppt · web viewtitle smart...
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MIMO WIRELESS COMMUNICATION
SYSTEMSBhaskar D. Rao
University of California, San DiegoLa Jolla, CA 92093-0407
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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 ….
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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)
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Prerequisites
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Course Grading Homeworks 40%
Theory and Matlab Project 25%
Presentation on day of Finals Exam 35%
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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)
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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
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Variants of Multiple Antenna Systems
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Terminology
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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
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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
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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
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Beamforming
Antenna Array
Interferer
Interferer
Interferer
DesiredUser
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Multi-Input Multi-Output System
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Capacity of MIMO systems
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Role of Diversity
Two Fading Channels combined to improve SNR: Diversity gain
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Spatial Diversity to Combat Fading