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BLAST
(BELL LABORATRIES
LAYERED SPACE TIME)
GUIDE: Mr. ARUN T
KOKILA A V
S8, ECE A
NCAJEEC061
ECE DEPARTMENT 1
ABSTRACT
• Wireless communication technique
• Exploits multipath using scattering
characteristics
• Offer spatial multiplexing over multiple antenna
system
• improve spatial multiplexing gain provided by
MIMO systems.
• Developed by GERARD FOSCHINI
ECE DEPARTMENT 2
ECE DEPARTMENT
3
• KEYWORDS
• INTRODECTION
• BACKGROUND
• SPACE TIME CODING
• LAYERED SPACE TIME CODIND
• BELL LABS LAYERED SPACE TIME
• TYPES OF BLAST
• D-BLAST
• V-BLAST
• ADVANTAGES
• DISADVANTAGES
• CONCLUSION
CONTENTS
KEYWORDS
• MIMO: MULTIPLE INPUT OUTPUT
• STC: SPACE-TIME CODING
• LST: LAYERED SPACE-TIME CODING
• BLAST: BELL LABS LAYERED SPACE TIME
• D-BLAST: DIGONALLY LAYERED BLAST
• V-BLAST: VERTICAL BLAST
• RLST: RANDOM LAYERED SPACE-TIME
ECE DEPARTMENT 4
INTRODUCTION
• Demand for wireless internet access rise rapidly
• MIMO systems have been extensively used in
wireless communication
• Space-time layered architectures offer a big increase
in capacity
• A layered space time architecture was proposed by
bell labs and labeled as BLAST
ECE DEPARTMENT 5
ECE DEPARTMENT 6
BACKGROUND
• SPACE-TIME CODING(STC)
Current transmission scheme over MIMO channels
•Data rate maximization
•Diversity maximization
STC aimed at realizing joint encoding across
MIMO channels
Number of code symbols equal to number of
transmit antennas
BACKGROUND
LAYERED SPACE-TIME CODING(LST)
• Limitation of MIMO channel using STC
• LST was designed to improve the multiplexing gain by
transmitting nT independent data streams
ECE DEPARTMENT 7
BLAST
• Layered space architecture proposed by bell labs
• Developed by Dr. G.J Foschini
• Efficient manner to enhance capacity
• Transmission accuracy
ECE DEPARTMENT 8
TYPRES OF BLAST
• D-BLAST: Diagonally layered architecture
• V-BLAST: Vertical BLAST
• Turbo-BLAST
ECE DEPARTMENT 9
D-BLAST
• Original scheme in BLAST family
• Diagonally layered coding sequence
• Input data streams divided to several substreams
• STC aimed at realizing joint encoding across MIMO
channels
• Number of code symbols equal to number of
transmit antennas
• Substreams are coded independently
• Decoder proceeds to decode one layer after another
ECE DEPARTMENT 10
V-BLAST
• Simplified version of D-BLAST
• Layering is horizontal
ECE DEPARTMENT 11
OVERVIEW TO V-BLAST SYSTEM
OVERVIEW OF BLAST SYSTEM
• Single data streams is demultiplexed to M
substreams
• Independent bit-to-bit symbol l mapping
• Decoder needs to demodulate the symbols
• Scheme is also known as vector modulation
ECE DEPARTMENT 12
Turbo-BLAST
ECE DEPARTMENT 13
• Turbo-BLAST is a multitransmit multireceive (MTMR)
antenna scheme for high-throughput wireless
communications.
• Random layered space coding scheme (RLST)
• spectral efficiency attained in the course of two to
four iterations of the receiver
• Built-in capability of accommodating the multiple-
antenna configuration
APPLICATION
• Wireless radio communication system
• Wireless internet access
ECE DEPARTMENT 14
SCOPE OF DEVELOPMENT
• Unitary space modulation for fast fading
mobile environment
• Can make the effect of channel fading
effective
ECE DEPARTMENT 15
ADVANTAGES
 Entire sub streams are transmitted in the same
frequency band.
 Spectrally efficiency.
 Total radiated power is held constant irrespective of
the number of transmitting antennas.
 The combined use of transmit and receive arrays
improve the data rate.
 With BLAST downloading a song would take 3s only.
ECE DEPARTMENT 16
DISADVANTAGES
• It would require manufacture to invest in the
development of new multi-antenna devices.
• Require new wireless network infrastructure.
ECE DEPARTMENT 17
CONCLUSION
• Improves the MIMO channels capacity
• It would require manufacture to invest in the
development of new multi-antenna devices.
• Require new wireless network infrastructure.
ECE DEPARTMENT 18
REFERENCES
• www.bell-labs.com
• IEEE article 2010
• Communication and network, may2011
(www.scrip.org/journal/cn)
• hochwald@research.bell-labs.com
ECE DEPARTMENT 19
ECE DEPARTMENT 20

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pptseminar-16-130305074446-phpapp02.pdff

  • 1. BLAST (BELL LABORATRIES LAYERED SPACE TIME) GUIDE: Mr. ARUN T KOKILA A V S8, ECE A NCAJEEC061 ECE DEPARTMENT 1
  • 2. ABSTRACT • Wireless communication technique • Exploits multipath using scattering characteristics • Offer spatial multiplexing over multiple antenna system • improve spatial multiplexing gain provided by MIMO systems. • Developed by GERARD FOSCHINI ECE DEPARTMENT 2
  • 3. ECE DEPARTMENT 3 • KEYWORDS • INTRODECTION • BACKGROUND • SPACE TIME CODING • LAYERED SPACE TIME CODIND • BELL LABS LAYERED SPACE TIME • TYPES OF BLAST • D-BLAST • V-BLAST • ADVANTAGES • DISADVANTAGES • CONCLUSION CONTENTS
  • 4. KEYWORDS • MIMO: MULTIPLE INPUT OUTPUT • STC: SPACE-TIME CODING • LST: LAYERED SPACE-TIME CODING • BLAST: BELL LABS LAYERED SPACE TIME • D-BLAST: DIGONALLY LAYERED BLAST • V-BLAST: VERTICAL BLAST • RLST: RANDOM LAYERED SPACE-TIME ECE DEPARTMENT 4
  • 5. INTRODUCTION • Demand for wireless internet access rise rapidly • MIMO systems have been extensively used in wireless communication • Space-time layered architectures offer a big increase in capacity • A layered space time architecture was proposed by bell labs and labeled as BLAST ECE DEPARTMENT 5
  • 6. ECE DEPARTMENT 6 BACKGROUND • SPACE-TIME CODING(STC) Current transmission scheme over MIMO channels •Data rate maximization •Diversity maximization STC aimed at realizing joint encoding across MIMO channels Number of code symbols equal to number of transmit antennas
  • 7. BACKGROUND LAYERED SPACE-TIME CODING(LST) • Limitation of MIMO channel using STC • LST was designed to improve the multiplexing gain by transmitting nT independent data streams ECE DEPARTMENT 7
  • 8. BLAST • Layered space architecture proposed by bell labs • Developed by Dr. G.J Foschini • Efficient manner to enhance capacity • Transmission accuracy ECE DEPARTMENT 8
  • 9. TYPRES OF BLAST • D-BLAST: Diagonally layered architecture • V-BLAST: Vertical BLAST • Turbo-BLAST ECE DEPARTMENT 9
  • 10. D-BLAST • Original scheme in BLAST family • Diagonally layered coding sequence • Input data streams divided to several substreams • STC aimed at realizing joint encoding across MIMO channels • Number of code symbols equal to number of transmit antennas • Substreams are coded independently • Decoder proceeds to decode one layer after another ECE DEPARTMENT 10
  • 11. V-BLAST • Simplified version of D-BLAST • Layering is horizontal ECE DEPARTMENT 11 OVERVIEW TO V-BLAST SYSTEM
  • 12. OVERVIEW OF BLAST SYSTEM • Single data streams is demultiplexed to M substreams • Independent bit-to-bit symbol l mapping • Decoder needs to demodulate the symbols • Scheme is also known as vector modulation ECE DEPARTMENT 12
  • 13. Turbo-BLAST ECE DEPARTMENT 13 • Turbo-BLAST is a multitransmit multireceive (MTMR) antenna scheme for high-throughput wireless communications. • Random layered space coding scheme (RLST) • spectral efficiency attained in the course of two to four iterations of the receiver • Built-in capability of accommodating the multiple- antenna configuration
  • 14. APPLICATION • Wireless radio communication system • Wireless internet access ECE DEPARTMENT 14
  • 15. SCOPE OF DEVELOPMENT • Unitary space modulation for fast fading mobile environment • Can make the effect of channel fading effective ECE DEPARTMENT 15
  • 16. ADVANTAGES  Entire sub streams are transmitted in the same frequency band.  Spectrally efficiency.  Total radiated power is held constant irrespective of the number of transmitting antennas.  The combined use of transmit and receive arrays improve the data rate.  With BLAST downloading a song would take 3s only. ECE DEPARTMENT 16
  • 17. DISADVANTAGES • It would require manufacture to invest in the development of new multi-antenna devices. • Require new wireless network infrastructure. ECE DEPARTMENT 17
  • 18. CONCLUSION • Improves the MIMO channels capacity • It would require manufacture to invest in the development of new multi-antenna devices. • Require new wireless network infrastructure. ECE DEPARTMENT 18
  • 19. REFERENCES • www.bell-labs.com • IEEE article 2010 • Communication and network, may2011 (www.scrip.org/journal/cn) • hochwald@research.bell-labs.com ECE DEPARTMENT 19