Wireless Communication systems
WiMAX Technology
Paul Borza
Wireless communication systemsRole and features
• To assure anytime, anywhere the possibility to communicate with others
• 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
• Offer high data rates (<75Mbps)
• Quality of Services (QoS) that assure a optimal scheduling of space, time and frequency
• Offer an important range: until 50km (LOS)
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. 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 cost-
effective deployment of metropolitan area networks based on the IEEE 802.16e standard to support notebook PC and mobile users on move.
What is WiMAX?
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
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)
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 Self-Interference
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
Physical Layer (OFDM)
Orthogonal Frequency Division Multiplexing (OFDM) is a multi-plexing techniquethat 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
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
Cellular backhaul
Metropolitan Area Network
Enterprise connectivity and SoHo Enterprise connectivity
Implementing elements for WiMAX technology
Base stationsCPEAntennasTerminals
WiMAX SoC
Intel 5116 chip
Wireless Intel 5116
Intel® PRO/Wireless 5116 CPE system diagram
Last news:End of 2006 they will realize
the firstWiFi & WiMAX chip
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 high-performance 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 VoiceOn line Gaming Security and Surveillance SystemsMultimedia CommunicationsSensor NetworksTelematics and Telemetry Remote monitoring patientsMobile transmissions of mapsWireless transmissions of images
Bibliography
1. Deepak Pareek, „The Business of WiMAX“, John Wiley & Sons, Ltd., 2006
2. ***, Mobile WiMAX – Part I & Part II:A Comparative Analysis,Wimax Forum, 2006
3. *** Wikipedia, Orthogonal Frequency – division multiplexing, accessed May 2006 on: http://en.wikipedia.org/wiki/COFDM#Comparison_to_FDM
4. *** Intel Corporation, Intel 5116 chip, accessed June 2006 , on: http://www.intel.com/netcomms/technologies/wimax/wimax_docs.htm
5. *** Fujitsu Corp, MB87M3400 Fujitsu WiMAX 802.16-2004 SoC for Next-generation Broadband Wireless Access accessed June 2006 on: http://www.fujitsu.com/downloads/MICRO/fma/pdf/MB87M3400_0605.pdf
