1. IEEE 802.11n MIMO Haroun Ferhat David Grégoire July 11, 2006

2. Wireless Standards IEEE 802.15.3 UWB, Bluetooth Wi-Media, BTSIG, MBOA WAN MAN LAN PAN ETSI HiperPAN IEEE 802.11 Wi-Fi Alliance ETSI-BRAN HiperLAN2 IEEE 802.16d WiMAX ETSI HiperMAN & HIPERACCESS IEEE 802.20 IEEE 802.16e 3GPP (GPRS/UMTS) 3GPP2 (1X--/CDMA2000) GSMA, OMA IEEE 802.15.4 (Zigbee Alliance) RFID (AutoID Center) RAN IEEE 802.22

3. 19941995199619971998199920002001200220032004200520062007 Growing 802.11 Standards 802.11 11a 11b 11c 11d 11e 11g 11h 11i 11j 11k 11n 11ma 11f 11u.11s,.11v,.11T,.11 r,.11p

4. What do home users want? Range Reliable High fidelity & quality A/V Backwards compatibility with older 802.11 standards For 3 streams in the home, with picture-in-picture, and Internet access, 100Mbps UDP level throughput is easily consumed

5. What do ISPs need ? Consumer satisfaction, as high as possible : users will blame the service provider Video and high throughput (mobile) data sessions Management capability to the devices High rate for outdoor to indoor 150m operations

6. 802.11 WLAN Standards 802.11b802.11a802.11g802.11n Standard Approved Sept. 1999 June2003? Available Bandwidth 83.5 MHz 580 MHz 83.5 MHz 83.5/580MHz Frequency Band of Operation 2.4 GHz 5 GHz 2.4 GHz 2.4/5 GHz # Non-Overlapping Channels (US) 32433/24 Data Rate per Channel 1 – 11 Mbps 6 – 54 Mbps 1 – 54 Mbps 1 – 600 Mbps Modulation Type DSSS, CCK OFDM DSSS, CCK, OFDM OFDM,MIMO

7. Uses – Source : Wi-Fi alliance Applications and target marketsTransmission characteristics ApplicationExamplesTypeRateDuration/ volume Audio/Video 1HDTV and DV viewing for commercial & domestics use Constant (low jitter) 27 MbpsHours Audio/Video 2SDTV viewing for commercial and domestic use Constant (low jitter) 6 MbpsHours Audio/Video 3Video conferencing with VoIPConstant (low jitter) 2 Mbps< 1 hr Interactive 1Interactive gaming, Internet Browsing, Email Variable2 Mbps1 hr Interactive 2VoIP, Internet gamingConstant with intervals.2 MB/s1 min – 1 hr Bulk transferFlash downloads file transfer, media transfer Variable30 Mbps10 MB – 10 GB

8. .11 n proposals  32 proposals, 4 complete (Sept 04, Nov 04)  TGn Sync  WWISE  Motorola/Mitsubishi  Qualcom  Down select and merger (Jan 05)  TGn Sync  WWISE

9. IEEE 802.11n basics: 2 main proposals (TGn SYNC & WWISE) Key PointsTGn SYNCWWISE MembersAgere, Atheros Cisco, Intel, Mitsubishi Philips, Sony Toshiba, Qualcom, Nortel, Samsung, Marvel, Panasonic, Tohoku Univ, Nokia, Infocom Research, Sanyo Broadcom, TI, Airgo Networks, Conexant, Buffalo, Ralink, ETRI, HNS, Realtek, STM, TrellisWare, Winbond Electronics UDP data rate200+ Mbps/40 MHz100+ Mbps/20 MHz MAC basic technologyaccommodate both EDCA and HCCA Packet sizes 0 to 64KB PSDUs

10. Conventional (SISO) Wireless Systems Conventional “Single Input Single Output” (SISO) systems were favored for simplicity and low-cost but have some shortcomings: Outage occurs if antennas fall into null  Switching between different antennas can help Energy is wasted by sending in all directions  Can cause additional interference to others Sensitive to interference from all directions Output power limited by single power amplifier channel Radio DSP Bits TX Radio DSP Bits RX

11. MIMO Wireless Systems Multiple Input Multiple Output (MIMO) systems with multiple parallel radios improve the following: Outages reduced by using information from multiple antennas Transmit power can be increased via multiple power amplifiers Higher throughputs possible Transmit and receive interference limited by some techniques channel Radio DSPDSP Bits TX Radio DSPDSP Bits RX Radio

12. MIMO The next generation WLAN uses MIMO technology The next generation WLAN uses MIMO technology Beamforming MIMO technology Beamforming MIMO technology Extends range of existing data rates by transmit and receive beamforming Extends range of existing data rates by transmit and receive beamforming Spatial-multiplexing MIMO technology Spatial-multiplexing MIMO technology Increases data rates by transmitting parallel data streams Increases data rates by transmitting parallel data streams MIMO allows system designers to leverage Moore’s law to deliver higher performance wireless systems MIMO allows system designers to leverage Moore’s law to deliver higher performance wireless systems

13. What’s up now ? January 19, 2006 : IEEE 802.11n Task Group approved the Joint Proposal's specification March 2006 : 802.11n Draft May 2, 2006 : Draft 1.0 rejected by sponsors The 802.11n standard is not due for final approval until July 2007