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

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

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 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 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

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

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