Smart Antenna Systems For Broadband Wireless Access Networks A Proposed Ph'D Research Plan

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Smart Antenna Systems For Broadband Wireless
Access Networks A Proposed Ph.D Research Plan
November 2001

• KARIM NASR
• nasrk _at_ cs.man.ac.uk
• Supervisors Prof. S.K. Barton
• Mrs. F. Costen
• Mobile Systems Architecture (MSA) Group
• Department of Computer Science

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OUTLINE

• Introduction
• Background
• Wireless LAN
• Wireless system challenges impairments
• Smart antenna basic idea
• Proposed research plan

K.NASR
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TRADITIONAL BROADCASTING ENVIRONMENT
STUDIO N
STUDIO 1
Audio/Video Tape libraries (Manual Tape Transfer)
PLATEAU
CONTROL ROOM
AUDIO AES/EBU / ANALOGUE
VIDEO SDI (ITU 601 - 270 Mbps) /PAL
Transmission
MASTER CONTROL ROOM
Outside Broadcasting OB
Routing/conversion /modulation-etc
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MOVING TO THE DATA DOMAIN
STUDIO N
STUDIO 1
ROBOTIC DATA LIBRARIES AND SERVERS
PLATEAU
?
CONTROL ROOM
AUDIO AES/EBU / ANALOGUE
VIDEO SDI (ITU 601 - 270 Mbps) /PAL
Transmission
MASTER CONTROL ROOM
Outside Broadcasting OB
Routing/conversion /modulationetc
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ELECTRONIC VIDEO ARCHIVING SYSTEM (WIRED INTRANET)
EXPANDABLE DATA TAPE ROBOTIC LIBRARY NEAR LINE (
DEEP ) ARCHIVE DTF or other large capacity /fast
DATA CARTRIDGES (2000 TO 5000 HOURS _at_50 Mbps
MPEG2)
CLUSTERED ON LINE CACHING SERVER FIBERCHANNEL
RAID 3/5 STORAGE (48 TO 72 HOURS _at_50 Mbps MPEG2)
CLUSTERED BROWSE (LOW RESOLUTION)
SERVER FIBERCHANNEL RAID 3/5 STORAGE (2000 TO
5000 HOURS _at_2 Mbps MPEG2)
ATM or GIGABIT ETHERNET FIBRE NETWORK SWITCHES
BROADCAST QUALITY NON LINEAR EDITING
WORKSTATIONS/SERVERS
INGEST WORKSTATIONS WITH DROPOUT COMPENSATION
VIDEO FILTERING/SWEETENING
BROWSE WORKSTATIONS EDL PREPARATION
PLAYOUT BROADCAST QUALITY WORKSTATIONS/SERVERS IN
ON AIR /NEWS TV STUDIOS
SDI AES/EBU
PAL ANALOGUE AUDIO
SDI AES/EBU TO VISION MIXER/AUDIO MIXER FOR
BROADCASTING
DIGITAL VTRS/SOURCES (DIGITAL BETACAM / DIGITAL
S/ DVC) 7
VIDEO AUDIO ROUTING MATRICES
ANALOGUE VTRS/SOURCES (2/1/UMATIC/BETACAM/SP)
TEST MONITORING
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MOVING TO THE WIRELESS WORLD
INFRASTRUCTURE WLAN
FLEXIBILITY NO NEED FOR WIRING COMPLEXITIES
Server Computer
ETSI HIPERLAN/2
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• WIRELESS SYSTEM IMPAIRMENTS

• LIMITED SPECTRUM FOR A LARGE NUMBER OF USERS
• MULTIPATH FADING
• RAYLEIGH (Narrow Band)
• DELAY SPREAD ISI (Wide Band)
• SHADOWING (LONG TERM FADING)
• COCHANNEL INTERFERENCE

LOW DATA RATE !
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• SMART (ADAPTIVE) ANTENNA SYSTEM
• BASIC IDEA

ARRAY PROCESSOR
SIGNAL
RF DOWNCONVERSION
W 1
A/D
O/P
RF DOWNCONVERSION
W 2
A/D
?
INTERFERENCE
GENERATE ERROR SIGNAL
RF DOWNCONVERSION
W n
A/D
N elements can null out N-1 interferers
ADAPTIVE ALGORITHM
DOA Estimation

• HOW THE PERFORMANCE SHOULD IMPROVE
• BEAM STEERING ----- FOCUS ENERGY TOWARDS
  DESIRED USERS RANGE EXTENSION
• NULL STEERING ------ ISOLATE COCHANNEL USERS
  QUALITY /CAPACITY IMPROVEMENT
• OPTIMUM COMBINING / SPACE TIME PROCESSING -----
  REDUCE MULTIPATH FADING ISI HIGHER
  DATA RATES
• SDMA ------- MULTIPLE SIGNAL IN THE SAME
  BANDWIDTH HIGHER
  DATA RATES

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• TARGET

Investigation of the use of smart antenna systems
in broadband wireless networks using numerical
simulation and algorithmic development to enhance
the performance.
Broadband Wireless Intranet
Access point/Portable
Smart antenna
Algorithm
High data rate Multimedia
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• PROPOSED RESEARCH PLAN

FIRST YEAR
LITERATURE REVIEW
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PRELIMINARY SIMULATION /MODEL DESIGN/ TRADEOFF
STUDY
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CONTINUATION REPORT
SECOND YEAR
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• PROPOSED RESEARCH PLAN (Ctd.)

SECOND YEAR
POSTER
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2
3
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ADVANCED SIMULATION /DATA GATHERING ANALYSIS
THIRD YEAR
PRESENTATION
SUBMISSION
Hopefully Get a Ph.D !
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THESIS WRITING
K.NASR
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THANK YOU