参考说明第2批ieee80211n

1、IEEE 802.11nMIMOHaroun FerhatDavid GrgoireJuly 11, 2006Wireless StandardsIEEE 802.15.3 UWB, BluetoothWi-Media, BTSIG, MBOAWANMANLANPANETSI HiperPANIEEE 802.11 Wi-Fi AllianceETSI-BRAN HiperLAN2IEEE 802.16d WiMAXETSI HiperMAN & HIPERACCESSIEEE 802.20IEEE 802.16e3GPP (GPRS/UMTS)3GPP2 (1X-/CDMA2000)GSMA

2、, OMAIEEE 802.15.4(Zigbee Alliance)RFID(AutoID Center)RANIEEE 802.2219941995199619971998199920002001200220032004200520062007Growing 802.11 Standards802.1111a11b11c11d11e11g11h11i11j11k11n11ma11f11u.11s, .11v, .11T,.11 r, .11pWhat do home users want?RangeReliableHigh fidelity & quality A/VBackwards c

3、ompatibility with older 802.11 standardsFor 3 streams in the home, with picture-in-picture, and Internet access, 100Mbps UDP level throughput is easily consumed What do ISPs need ?Consumer satisfaction, as high as possible : users will blame the service providerVideo and high throughput (mobile) dat

4、a sessionsManagement capability to the devicesHigh rate for outdoor to indoor 150m operations802.11 WLAN Standards802.11b802.11a802.11g802.11nStandard ApprovedSept. 1999Sept. 1999June 2003?Available Bandwidth83.5 MHz580 MHz83.5 MHz83.5/580MHzFrequency Band of Operation 2.4 GHz5 GHz2.4 GHz2.4/5 GHz#

5、Non-Overlapping Channels (US) 32433/24Data Rate per Channel1 11 Mbps6 54 Mbps1 54 Mbps1 600 MbpsModulation TypeDSSS, CCKOFDMDSSS, CCK,OFDMDSSS, CCK,OFDM,MIMOUses Source : Wi-Fi allianceApplications and target markets Transmission characteristicsApplicationExamplesTypeRateDuration/volumeAudio/Video 1

6、HDTV and DV viewing for commercial & domestics useConstant (low jitter)27 MbpsHoursAudio/Video 2SDTV viewing for commercial and domestic useConstant (low jitter)6 MbpsHoursAudio/Video 3Video conferencing with VoIPConstant (low jitter)2 Mbps 1 hrInteractive 1Interactive gaming, Internet Browsing, Ema

7、ilVariable2 Mbps1 hrInteractive 2VoIP, Internet gamingConstant with intervals.2 MB/s1 min 1 hrBulk transferFlash downloads file transfer, media transferVariable30 Mbps10 MB 10 GB.11 n proposals32 proposals, 4 complete (Sept 04, Nov 04)TGn SyncWWISEMotorola/Mitsubishi Down select and merger (Jan 05)T

8、Gn SyncWWISEIEEE 802.11n basics: 2 main proposals (TGn SYNC & WWISE)Key PointsTGn SYNCWWISEMembersAgere, AtherosCisco, Intel, MitsubishiPhilips, SonyToshiba, , Nortel, Samsung, Marvel, Panasonic, Tohoku Univ, Nokia, Research, Sanyo , TI,Airgo Networks,Conexant, Buffalo, Ralink, ETRI, HNS, Realtek, S

9、TM, TrellisWare, Winbond ElectronicsUDP data rate200+ Mbps/40 MHz100+ Mbps/20 MHzMAC basic technology modate both EDCA and HCCA modate both EDCA and HCCAPacket sizes 0 to 64KB PSDUs0 to 64KB PSDUsConventional (SISO) Wireless SystemsConventional “Single Input Single Output” (SISO) systems were favore

10、d for simplicity and low-cost but have some ings:Outage occurs if antennas fall into nullSwitching between different antennas can helpEnergy is wasted by sending in all directionsCan cause additional interference to othersSensitive to interference from all directionsOutput power limited by single po

11、wer amplifierchannelRadioDSPBitsTXRadioDSPBitsRXMIMO Wireless SystemsMultiple Input Multiple Output (MIMO) systems with multiple parallel radios improve the following:Outages reduced by using information from multiple antennasTransmit power can be increased via multiple power amplifiersHigher throug

12、hputs possibleTransmit and receive interference limited by some techniqueschannelRadioDSPBitsTXRadioRadioDSPBitsRXRadioMIMOThe next generation WLAN uses MIMO technologyBeamforming MIMO technologyExtends range of existing data rates by transmit and receive beamformingSpatial-multiplexing MIMO technologyIncreases data rates by transmitting parallel data streamsMIMO allows system designers to leverage Moores law to deliver higher performance wireless systemsWhats up now ?January 19, 2006 : IEE