Transcript Wireless Communication systems

Wireless
Communication
systems
WiMAX Technology
Paul Borza
Wireless communication systems
Role and features
• To assure anytime, anywhere the possibility to communicate
with others
• Offer high data rates (<75Mbps)
• Offer an important range: until 50km (LOS)
• Quality of Services (QoS) that assure a optimal scheduling of
space, time and frequency
• Offer mobility of peoples that increase the productivity of them
• All the persons become reachable
• Bring simplicity in communication
• Bring autonomy in communication: fix, nomad and mobile
access that finally means global mobility
• Falling the installation costs
• Become a cultural element in our life
WiMAX communications system and their
neighborhood now and in the near future
WiMax
Deepak Pareek, „The Business of WiMAX“,
John Wiley & Sons, Ltd., 2006
What brings WiMAX?
WiMAX is a wireless communication system expected to deliver broadband
access services to residential and enterprise customers in an economical
way.
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fixed WiMAX is capable of becoming a replacement for DSL or cable or for
network backhaul.
 WiMAX will transform the world of mobile broadband by enabling the costeffective deployment of metropolitan area networks based on the IEEE 802.16e
standard to support notebook PC and mobile users on move.
What is WiMAX?
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A wireless technology optimized for the delivery of IP
centric services over a wide area.
A certification that denotes interoperability of
equipment built to the IEEE 802.16 or compatible
standard.
The IEEE 802.16 Working Group develops standards
that address two types of usage models:
 a fixed usage model (IEEE 802.16-2004) and
 a portable usage model (802.16 REV e, ratificated at
the end of 2005).
A scaleable wireless platform for constructing
alternative and complementary broadband networks.
Wireless communication systems
and their application fields
Which are the main advantages of WiMAX
technology
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interoperability;
cost of base stations and CPE;
shared bandwidth up to 100 Mbps;
line-of-sight not required;
coverage 3–30 miles, more like cellular;
licensed and unlicensed spectrum;
many DOCSIS-like features including QoS;
milestone to ‘broadband everywhere’.
Deepak Pareek, „The Business of WiMAX“, John Wiley & Sons, Ltd., 2006
WiMAX key capabilities (1)
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Centrally coordinated architecture:
 high-end security, encryption and service authentication;
 no ad-hoc PP client communication is possible;
 robust radio interface that works in NLOS conditions;
 OFDM PHY supports indoor, self installation by end users.
High-speed IP services:
 optimized to deliver 110 Mbps (net) services (in 3.5 MHz);
 Up to 3550 Mbps (net) with large channels (1420 MHz).
Second generation IP QoS:
 hierarchical QoS supports real-time and grant-based
service delivery
A low delay radio interface:
 enables latency and jitter sensitive applications (VoIP,
Internet Gaming, etc.)
WiMAX key capabilities (2)
Tolerance to Multipath and SelfInterference
 Scalable Channel Bandwidth
 Orthogonal Uplink Multiple Access
 Support for Spectrally-Efficient TDD
 Frequency-Selective Scheduling
 Fractional Frequency Reuse
 Fine Quality of Service (QoS)
 Advanced Antenna Technology
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Physical Layer (OFDM)
Orthogonal Frequency
Division Multiplexing
(OFDM) is a multiplexing technique
that subdivides the
bandwidth into multiple
frequency sub-carriers
as shown in left side
• OFDM modulation can be realized with efficient Inverse
Fast Fourier Transform (IFFT), which enables a large
number of sub-carriers (up to 2048) with low complexity.
• In an OFDM system, resources are available in the time
domain by means of OFDM symbols and in the frequency
domain by means of sub-carriers. The time and frequency
resources can be organized into sub-channels for allocation
to individual users.
•Orthogonal Frequency Division Multiple Access (OFDMA)
is a multiple-access/multiplexing scheme that provides
multiplexing operation of data streams from multiple users
onto the downlink sub-channels and uplink multiple access
by means of uplink sub-channels.
Spectrum efficiency
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IEEE 802.16e standards have flexible channel
bandwidths between 1.5 and 20 MHz to facilitate
transmission over longer ranges and to different types of
subscriber platforms.
Evolution of WiMAX standards
Road map of WiMAX Technology
WiMAX regulations
WiMAX Architecture
Main structures of WiMAX system
Metropolitan Area Network
Cellular backhaul
Enterprise connectivity and SoHo
Enterprise connectivity
Implementing elements for WiMAX
technology
Base stations
CPE
Antennas
Terminals
WiMAX SoC
Intel 5116 chip
Last news:
End of 2006 they will realize
the first
WiFi & WiMAX chip
Wireless Intel 5116
Intel® PRO/Wireless 5116 CPE system
diagram
Fujitsu (MB87M3400)WiMAX chip
•Single chip fully compliant with IEEE 802.16-2004 PHY
& MAC
•Support licensed and license-exempt frequencies from
2 to 11GHz and up to 20MHz bandwidth
•Dual RISC processors for implementing upper and
lower layer MAC
•Uplink sub-channelization
•Flexible baseband interface with integrated highperformance ADC & DAC
•Dynamic Frequency Selection (DFS) with integrated
DAC
•DES & AES encryption/decryption for 802.16 MAC
privacy sub-layer
Subscriber Station Reference Board =>
Applications of WiMAX Technology
Wireless voice over IP (VoIP)
Virtual private LAN Services (VPLS)
Video on Demand (VoD)
Vehicular Data and Voice
On line Gaming
Security and Surveillance Systems
Multimedia Communications
Sensor Networks
Telematics and Telemetry
Remote monitoring patients
Mobile transmissions of maps
Wireless transmissions of images
Bibliography
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Deepak Pareek, „The Business of WiMAX“, John Wiley & Sons, Ltd.,
2006
***, Mobile WiMAX – Part I & Part II:A Comparative Analysis,Wimax
Forum, 2006
*** Wikipedia, Orthogonal Frequency – division multiplexing, accessed
May 2006 on:
http://en.wikipedia.org/wiki/COFDM#Comparison_to_FDM
*** Intel Corporation, Intel 5116 chip, accessed June 2006 , on:
http://www.intel.com/netcomms/technologies/wimax/wimax_docs.htm
*** Fujitsu Corp, MB87M3400 Fujitsu WiMAX 802.16-2004 SoC for Nextgeneration Broadband Wireless Access accessed June 2006 on:
http://www.fujitsu.com/downloads/MICRO/fma/pdf/MB87M3400_
0605.pdf