Slides on Wimax
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WiMAX (802.16e) is a wireless technology that provides broadband internet access over long distances. It can provide speeds up to 40 Mbps for fixed access and 1 Gbps for updated versions. The document discusses the history and standards of 802.16/WiMAX, how a WiMAX network is architected, and technical details such as OFDMA and mobility support. WiMAX aims to wirelessly connect entire cities to high-speed broadband internet.
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Slides on Wimax
- 1. WiMAX (802.16e)“Worldwide Interoperability Of Microwave Access”A Road to Mobile Life BY: AtulKumar R.n-18(cs-A)SOE ,CUSAT
- 2. “WiMAX-we belive it’s the next big thing in the wireless boardband arena” By:-President of WiMAX group and intel manager[wallstjournal,america]
- 3. What is Wimax ?WiMAX is a telecommunications protocol that provides fixed and fully mobile internet access. The current WiMAX revision provides up to 40 Mbit/s with the IEEE 802.16m update expected offer up to 1 Gbit/s fixed speeds.
- 4. Some Wireless StandardsBluetooth DECT (Digital Enhanced Cordless Telecommunications) DSRC (Dedicated Short Range Communications) HIPERLAN HIPERMAN IEEE 802.11 IrDA RFID (Radio Frequency Identification) WiFiWiMAXxMaxZigBee
- 5. 802.16(Dec 2001)802.16c(2002)802.16a(Jan 2003)802.16REVd (802.16-2004)(Oct 2004)802.16e(802.16-2005)(Dec 2005)802.16 Standards History First standard based on proprietary implementations of DOCSIS/HFC architecture in wireless domain
- 6. Original fixed wireless broadband air Interface for 10 – 66 GHz: Line-of-sight only, Point-to-Multi-Point applications
- 7. Extension for 2-11 GHz: Targeted for non-line-of-sight, Point-to-Multi-Point applications like “last mile” broadband access802.16 AmendmentWiMAX System Profiles10 - 66 GHzAdds WiMAX System Profiles and Errata for 2-11 GHz
- 8. MAC/PHY Enhancements to support subscribers moving at vehicular speedsThe IEEE 802.16 standard forms the basis of 'WiMAX' and is sometimes referred to colloquially as "WiMAX", "Fixed WiMAX", "Mobile WiMAX", "802.16d" and "802.16e."Clarification of the formal names are as follow:802.16-2004 ,is also known as 802.16d, which refers to the working party that has developed that standard. It is sometimes referred to as "Fixed WiMAX," since it has no support for mobility.802.16e-2005, often abbreviated to 802.16e, is an amendment to 802.16-2004. It introduced support for mobility, among other things and is therefore also known as "Mobile WiMAX".
- 9. INTERNET BACKBONEHOW WiMAX WORKISPNetworkWiMAX 802.10 transmitterNon Line Of Sight TransmitterHOME LOCAL AREA NETWORK
- 11. Applications of 802.16 Standards
- 14. Wireless Performance(as of 2003)
- 15. OFDMA Subchannels A subset of subcarriers is grouped together to form a subchannel
- 16. A transmitter is assigned one or more subchannels in DL direction (16 subchannels are supported in UL in OFDM PHY)Subchannels provide interference averaging benefits for aggressive frequency reuse systems
- 17. OFDM BasicsOrthogonal SubcarriersCyclic Prefix in Frequency DomainCyclic Prefix in Time Domain
- 18. Equalizers are avoided in OFDMNarrow bandwidth long symbol times all significant multipaths arrive within a symbol time minimizing ISI no equalization low complexityNote: All signals & multipath over a useful symbol time are from the same symbol & add constructively (no ISI) Tx SignalRx Signaltime Cyclic Prefix Useful Symbol Time timeNote: dashed lines represent multipath
- 19. OFDMA Scalability Supports s wide range of frame sizes (2-20 ms)Source: Intel “Scalable OFDMA Physical Layer in IEEE 802.16 WirelessMAN”
- 20. Time Division Duplexing (TDD)
- 21. Connections802.16/WiMAX is connection orientedFor each direction, a connection identified with a 16 bit CIDEach CID is associated with a Service Flow ID (SFID) that determines the QoS parameters for that CID
- 22. PDU TransmissionSource: R. Marks (NIST) IEEE Presentation
- 23. Advanced 802.16 FeaturesMultiple Input and Multiple Output (MIMO)MIMO channel capacity is given by C = B log2 det(I + SNR.HH*T/N) where H is MxN channel matrix with M and N are receive and transmit antennas, resp.Hybrid-ARQFor faster ARQ, combines error correction and detection and makes use of previously received versions of a frameAdaptive Antenna System (AAS)Enables directed beams between BS and SSs
- 24. WiBro (Wireless Broadband)WiBro is an early large-scale deployment of 802.16 in South Korea (Dec 2005)Demonstrates 802.16 performance as compared to 3G/4G cellular alternatives3 operators have been licensed by the government (each spending ~$1B)
- 25. APPLICATIONCellular backhaulBoardband on-demandResidential boardbandUnderserverd areaBest connection service
- 26. BenefitsCost and Investment risk:Goes where cable and fiber cannot:ThroughputScalabilityCoverageQuality of serviceSecurityinteroperability
- 27. ConclusionWiMAX is not the technology of future; it is already something that being implemented in many area around globe. A good example being WiBRO which is an 802.16 implementation in south korea.WiMAX aim to make entire cities wireless