Transcript SMART ANTENNAS FOR WIRELESS COMMUNICATION

MIMO WIRELESS
COMMUNICATION SYSTEMS
Bhaskar D. Rao
University of California, San Diego
La Jolla, CA 92093-0407
Textbooks
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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
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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
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Homeworks 40%
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Project 25%
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Theory and Matlab
Presentation on day of Finals
Exam 35%
Wireless Channel Characteristics
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Fading:
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ISI: Paths with different delays causing intersymbol
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Multiple Paths with different phases add
up at the receiver resulting in a random path gain
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
Mobile
Mobile
Base station
Mobile
Mobile
Base station
Mobile
Goal: Exploit the spatial dimension to improve capacity and
quality of network
Variants of Multiple Antenna Systems
Terminology
Benefits of Space-Time Processing
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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
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Spatial Diversity to Combat Fading
Spatial Signature for Interference Suppression
Array Gain enables Lower Power Consumption
Multiple Transmit Antennas provide Transmit
Diversity
Capacity Improvements using Spatial
Multiplexing
Scenarios
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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
Interferer
Desired
User
Interferer
Antenna Array
Interferer
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