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Tutorial
2: Emerging Wireless Standards for WRAN, WiFi, WiMedia and ZigBee
Duration:
Full-Day
9:00
- 17:00, 30 Oct Monday
Instructors:
Ying-Chang Liang, Sumei Sun, Xiaoming Peng and Francois Chin
Institute for Infocomm Research, Singapore
In this tutorial, we are going to cover the following four emerging
wireless technologies: Wireless Regional Area Networks (WRAN), Wireless
Local Area Networks (WiFi), High Rate Ultra-Wide Band Communications
(WiMedia) and Low Rate UWB (ZiBee).
Tutorial
Outline
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IEEE802.22
Wireless Regional Area Networks (WRAN): |
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The IEEE 802.22 Working Group has been formed in November 2004
with the task of developing a standard for wireless regional
area network (WRAN) based on cognitive radio technology. According
to its technical specifications, 802.22 WRAN systems will operate
on the VHF/UHF TV bands ranging from 54 MHz to 862 MHz. The
target of WRAN is to provide wireless broadband access with
the average coverage radius of 33 km and can go up to 100km.
The operating principle is to make unlicensed access to unused
or under-utilized TV spectrum. In particular, 802.22 WRAN systems
will be able to sense the spectrum, identify unused TV channels,
and utilize these channels to provide broadband services for
fixed wireless subscribers. While doing so, they must make sure
that no harmful interference is caused to the incumbent users,
which, for the VHF/UHF bands, include TV receivers and Part
74 wireless microphones.
This part
will cover the physical layer aspect, channel sensing mechanism
and solutions, as well as schemes for protecting the primary
users. We will highlight how cognitive radio technologies
are applied in WRAN system design.
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| (2)
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IEEE802.11n
High Throughput Wireless Local Area Networks (WLAN):
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The
IEEE 802.11n High Throughput (HT) Wireless Local Area Network
(WLAN) standard is being developed with the target of delivering
a minimum of 100 Mbps data rate over 20MHz bandwidth, through
multiple input multiple output (MIMO) technology. Various MIMO
processing techniques, including spatial division multiplexing
(SDM), space-time block coding (STBC), transmit beamforming
(TxBF), have been incorporated in the current draft standard
through a scalable physical layer (PHY) and Medium Access Control
(MAC) architecture to enable the high throughput capability,
efficiency, as well as robustness and range advantages. In addition
to the mandatory convolutional code, low density parity check
(LDPC) code has been identified as the optional error correction
coding scheme to enhance the system performance. The standard
is also mandated backward compatibility with the legacy IEEE
802.11a/11g standards. We
will focus on the PHY aspect in this part of the tutorial.
We will start with an overview on the various MIMO processing
techniques in 11n. We will then discuss the preamble structure
with the highlight on its backward compatibility with IEEE
802.11a/11g standards. Finally the low density parity check
(LDPC) codes will be briefly introduced.
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| (3)
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WiMedia
High Rate UWB for Wireless Personal Area Networks (WPAN) |
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The convergence
of data entertainment and mobile communications within the
home has created the need for economical technologies and
architectures capable of integrating both legacy and new Personal
Area Networks. UWB technology is uniquely qualified to address
that requirement and was designed specifically to support
high speed, short range, point-to-point wireless communications.
The industry has endorsed WiMedia and is establishing design
guidelines and standards based on MB-OFDM platform to ensure
interoperability and coexistence between protocols for various
interfaces including Wireless USB, Wireless 1394 and native
IP-based applications.
This part
will give a comprehensive overview of this emerging WiMedia
standard which was originally started from IEEE 802.15.3a
standard. It will cover the physical layer aspects of the
standard, such as MB-OFDM system design, worldwide regulation
and detection and avoid mechanism. We will also highlight
other UWB technologies, such as DS-UWB and CWAVE.
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| (4) |
IEEE 802.15.4a (ZigBee) Update and Emerging Applications |
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This part will give a comprehensive overview of the emerging
IEEE 802.15.4a standard, which aims to provide low data rate
wireless communications with high-precision ranging and localization,
by employing UWB technologies for a low-power and low cost
solution. The talk will start with some applications that
are likely to emerge with this new standard, followed by the
physical layer aspects of the standard, such as common preamble
design for both coherent and non-coherent receivers, modulation
and coding, band plan, ranging mechanism.
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About
the Instructors
Dr
Ying-Chang Liang
(ycliang@i2r.a-star.edu.sg) received the PhD degree in Electrical
Engineering in 1993. He is now a Senior Scientist in the Institute
for Infocomm Research (I2R), Singapore. He also holds
adjunct associate professorship positions in Nanyang Technological
University (NTU) and National University of Singapore (NUS), Singapore.
From Dec 2002 to Dec 2003, Dr Liang was a visiting scholar with
the Department of Electrical Engineering, Stanford University. In
I2R, Dr Liang is leading the research activities in cognitive
radio and standardization activities in IEEE 802.22 wireless regional
networks (WRAN) for which his team has made fundamental contribution
in physical layer, MAC layer as we as the channel sensing part.
His other research interest includes space-time wireless communications,
reconfigurable signal processing for broadband communications, and
capacity-achieving schemes for MIMO fading channels. Dr Liang received
the Best Paper Awards from IEEE Vehicular Technology Conference,
1999 and IEEE PIMRC'2005. He has published over 100 international
journal and conference papers. He served as an Associate Editor
for IEEE Transactions on Wireless Communications from 2002 to 2005.
He was Publication Chair for 2001 IEEE Workshop on Statistical Signal
Processing, Co-Chair of the NUS IMS program on Random Matrix Theory
and Its Applications in Statistics and Wireless Communications,
and is now serving as a TPC Co-Chair for ICCS 2006.
Sumei
Sun (sunsm@i2r.a-star.edu.sg) Sumei Sun has been working
at Institute for Infocomm Research since 1995, where she worked
on R&D projects on CDMA multiuser detection and interference
cancellation, 3G W-CDMA downlink terminal algorithms, broadband
wireless access transceivers, etc. Since 2001, she's been leading
the MIMO-OFDM effort for high data rate wireless LAN applications
at I2R, and her group has contributed actively to the IEEE 802.11n
standardization efforts. Her research interests include MIMO system
architecture, iterative receiver algorithms, and error correction
coding. She's a co-recipient of the IEEE PIMRC 2005 Best Paper Award.
Xiaoming
Peng (pengxm@i2r.a-star.edu.sg) received his B.Eng degree
in electrical engineering from Beijing University of Aeronautics
and Astronautics, China in 1994, and M.Eng degree from Nanyang Technological
University, Singapore in 2001. He is currently working toward his
Ph.D degree at National University of Singapore. From 1994-1996,
he worked for Elec & Eltek on PSTN project. From 1996 to 1999,
he worked for GE helping to set up a R&D center in China on
digital cordless phone projects. Since 2001, he has been with Institute
for Infocomm Research (I2R), a national R&D institute under
the Agency for Science Technology & Research (A*STAR), Singapore,
where he is heading high rate UWB project. His research interests
include ultra-wideband (UWB) and 3G Long Term Evolution systems,
covering modulation and coding, ARQ, OFDM, CDMA, and Air Interface
schemes. He is actively contributing to various standards include
WiMedia Alliance for High Rate UWB, IEEE 802.15.3a Alternate PHY
for High Rate UWB and IEEE 802.15.4a Alternate PHY for Low Rate
UWB. He is one of the authors of WiMedia UWB PHY technical specification
and IEEE 802.15.4a technical specification draft.
Dr Francois
Chin (chinfrancois@i2r.a-star.edu.sg) received his Ph.D.
degrees in electrical engineering from National University of Singapore.
Since 1995, he has been at the Institute for Infocomm Research,
a government-funded research institute, where he is now Department
Manager, leading few R&D teams in future broadband wireless
access technologies. His research focus include signal processing
techniques for wireless communications system capacity enhancement,
network optimisation, smart antenna systems, system design / performance
evaluation for future communications systems, including beyond 3G
cellular systems and Ultra-wideband (UWB) based high-speed short
range radio networks. He is actively contributing to various standardisation
activities/efforts, including 3GPP Long Term Evolution, WiMedia
Alliance for UWB Wireless Personal Area Network (WPAN), IEEE 802.15.3a
UWB Alternate PHY for High Rate, IEEE 802.15.4a UWB Alternate PHY
for Low-Rate Low-power WPAN, IEEE 802.22 Wireless Regional Area
Networks (WRAN). He has published over 100 papers in well-known
international journals and technical conferences, and has 10 pending
patents. He is a co-recipient of the 50th IEEE Vehicular Technology
and Communications Conference (IEEE VTC 1999-Fall) Best Paper Award;
and also received Institution Engineering of Singapore (IES) Prestigious
Engineering Achievement Award 2005. He is a senior member of IEEE
and a member of Radio Standard Technical Committee, Infocomm Development
Authority (Singapore).
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