School of Electrical and Computer Engineering
University of Tehran
Class Presentation for the Course:
“Custom Implementation of DSP Systems”
Mobile Broadband
Wireless Access (MBWA)
IEEE 802.20 Standard
By:
Reza Nakhjavani
Instructor:
Prof. S. M. Fakhraei
May 2010
All Materials are Copyrights of Their Respective Authors as Listed in References
Overview
Introduction
 802.16
 802.20
 802.20 PHY Layer
 802.16e vs. 802.20
 Intel® WiMAX Connection 2250
 Summary
 References

2
Introduction




[1]
Importance of accessing data and information in today’s
life.
Network protocols such as Wi-Fi (802.11) and WiMAX
(802.16) have been developed for such applications.
Need for these information services under fully mobile
conditions and in vehicular speeds has increased.
IEEE 802.20 standard(Mobile-Fi), has been developed
for mobile applications in speeds of up to 250 km/h.
3
Introduction

[3]
The Wireless Space
4
802.16: Fixed Broadband Wireless
Access: Wi-Max





[2]
Frequencies from 10 to 66 GHz
Time Division Duplex and Frequency Division
Duplex configurations are supported
Bandwidth
 75 Mbps of bandwidth for 2 to 3 miles.
Uplink : TDMA , DAMA
Downlink: TDM
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802.16: Fixed Broadband Wireless
Access: Wi-Max

[6]
Architecture :
6
802.16: Fixed Broadband Wireless
Access: Wi-Max

IEEE 802.16e
 Providing true
mobile broadband connectivity.
 Designed to support bands in the range 2 – 6GHz.
 Uses Scalable OFDMA to carry data
 Channel bandwidths :1.25 MHz~20MHz, with up to
2048 sub-carriers
 Adaptive modulation
Good Signal : 64 QAM
 Intermediate Signal: 16 QAM & QPSK
 Poor Signal : BPSK

[2]
 Good NLOS
(Non-line-of-sight) characteristics
7
802.20

Development needed to 802.16 protocol.
 Aims basically at throughput than mobility.
 802.20 is developed to cover the mobility part of
the 802.16.
allow the creation of low-cost, always-on, and
truly mobile broadband wireless networks.
 Bandwidths of 5, 10, and 20 MHz
 Peak data rates of 80 Mbit/s.

[7]
8
802.20 PHY Layer

[2]
PHY layer specs

duplex modes : Time Division Duplex (TDD) , Frequency Division
Duplex (FDD)

multi-carrier modes: On , Off

Modulation : OFDM with QPSK, 8PSK, 16QAM, and 64QAM
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802.20 PHY Layer

[4]
Transmitter
10
802.20 PHY Layer

Transmitter

[1]
OFDM Numerology
11
802.16e vs. 802.20
Standard
802.16e
802.20
Frequency Band
2-6 GHz
3.5 GHz
Channel Bandwidth
> 5 MHz
< 20 MHz
Transmission Rate
10 – 50 Mbps
> 16 Mbps
Parameter
Mobility
Mobile Speed
MAC / PHY
[2]
High-data-rate fixed
wireless user with
adjunct
mobility service
Fully mobile, highthroughput data user
60 kmph
up to 250 kmph
Extensions to 802.16a
MAC and PHY
New PHY and MAC
optimized for
packet data and adaptive
antennas
12
Intel® WiMAX Connection 2250

[8]
The Intel WiMAX Connection
2250 is compliant with both
IEEE 802.16-2004 and IEEE
802.16e-2005 specifications.
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Intel® WiMAX Connection 2250
(Specs)

OFDMA 512/1024 PHY mode

Bandwidths: up to 10 MHz

Support for TDD and H/FDD duplexing modes

Concatenated Reed-Solomon and Convolutional

Adaptive modulation (BPSK, QPSK, QAM16, QAM64)

Highly optimized DSP engine with multiple parallel
ALUs for concurrent complex operations per cycle,
which enables efficient OFDM/OFDMA processing
[8]
14
References

1- A. Jalili, S. M. Fakhraie, and S. Nader-Esfahani, “Performance Evaluation of
IEEE 802.20 PHY Layer,” (ICCET 2009), Jan. 2009.
2- http://www.ucs.louisiana.edu/~vrb5959/final.pdf
3- https://www.ntt-review.jp/archive/ntttechnical.php?contents=ntr200805sf3.html
4- WALKER BOLTON, et al,” IEEE 802.20:MOBILE BROADBAND WIRELESS
ACCESS”, IEEE Wireless Communications, February 2007
5- Local and Metropolitan Area Networks – Standard Air Interface for Mobile
Broadband Wireless Access Systems Supporting Vehicular Mobility – Physical
and Media Access Control Layer Specification, IEEE Standard 802.20, Aug. 2008.
6- http://www.mvt.co.th/images/upload/big/661.jpg
7- http://en.wikipedia.org/wiki/IEEE_802.20
8- http://download.intel.com/network/connectivity/products/wireless
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Questions?
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Thank you
17