IEEE 802.11nMIMO

Haroun Ferhat

David Grégoire

July 11, 2006

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 802.20IEEE 802.16e

3GPP (GPRS/UMTS)3GPP2 (1X--/CDMA2000)

GSMA, OMA

IEEE 802.15.4(Zigbee Alliance)

RFID(AutoID Center)

RANIEEE 802.22

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003 2004

2005

2006

2007

Growing 802.11 Standards

802.11802.11

11a11a

11b11b

11c11c11d11d

11e11e

11g11g11h11h

11i11i11j11j

11k11k

11n11n11ma11ma

11f11f

11u11u.11s, .11v, .11T,.11 r, .11p.11s, .11v, .11T,.11 r, .11p

What do home users want?

RangeReliableHigh fidelity & quality A/VBackwards 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

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

802.11 WLAN Standards

802.11b802.11b 802.11a802.11a 802.11g802.11g 802.11n802.11n

Standard ApprovedStandard Approved Sept. 1999Sept. 1999 Sept. 1999Sept. 1999 June June 20032003 ??

Available BandwidthAvailable Bandwidth 83.5 MHz83.5 MHz 580 MHz580 MHz 83.5 MHz83.5 MHz 83.5/58083.5/580MHzMHz

Frequency Band of Frequency Band of Operation Operation 2.4 GHz2.4 GHz 5 GHz5 GHz 2.4 GHz2.4 GHz 2.4/5 GHz2.4/5 GHz

# Non-Overlapping # Non-Overlapping Channels (US) Channels (US) 33 2424 33 3/243/24

Data Rate per ChannelData Rate per Channel 1 – 11 1 – 11 MbpsMbps

6 – 54 6 – 54 MbpsMbps

1 – 54 1 – 54 MbpsMbps

1 – 600 1 – 600 MbpsMbps

Modulation TypeModulation Type DSSS, CCKDSSS, CCK OFDMOFDMDSSS, DSSS, CCK,CCK,

OFDMOFDM

DSSS, DSSS, CCK,CCK,

OFDM,OFDM,MIMOMIMO

Uses – Source : Wi-Fi allianceApplications and target markets Transmission characteristics

Application Examples Type Rate Duration/volume

Audio/Video 1 HDTV and DV viewing for commercial & domestics use

Constant (low jitter)

27 Mbps Hours

Audio/Video 2 SDTV viewing for commercial and domestic use

Constant (low jitter)

6 Mbps Hours

Audio/Video 3 Video conferencing with VoIP Constant (low jitter)

2 Mbps < 1 hr

Interactive 1 Interactive gaming, Internet Browsing, Email

Variable 2 Mbps 1 hr

Interactive 2 VoIP, Internet gaming Constant with intervals

.2 MB/s 1 min – 1 hr

Bulk transfer Flash downloads file transfer, media transfer

Variable 30 Mbps 10 MB – 10 GB

.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

IEEE 802.11n basics: 2 main proposals (TGn SYNC & WWISE)

Key Points TGn SYNC WWISE

Members Agere, AtherosCisco, Intel, MitsubishiPhilips, SonyToshiba, 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 rate 200+ Mbps/40 MHz 100+ Mbps/20 MHz

MAC basic technology accommodate both EDCA and HCCA

accommodate both EDCA and HCCA

Packet sizes 0 to 64KB PSDUs 0 to 64KB PSDUs

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 helpEnergy is wasted by sending in all directions

Can cause additional interference to othersSensitive to interference from all directionsOutput power limited by single power amplifier

channelRadioDSPBits

TX

Radio DSP Bits

RX

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

DSP

Bits

TX

Radio

Radio

DSP

Bits

RX

Radio

MIMO The next generation WLAN uses MIMO technologyThe next generation WLAN uses MIMO technology

Beamforming MIMO technologyBeamforming MIMO technology Extends range of existing data rates by transmit and Extends range of existing data rates by transmit and

receive beamformingreceive beamforming

Spatial-multiplexing MIMO technologySpatial-multiplexing MIMO technology Increases data rates by transmitting parallel data Increases data rates by transmitting parallel data

streamsstreams

MIMO allows system designers to leverage MIMO allows system designers to leverage Moore’s law to deliver higher performance Moore’s law to deliver higher performance wireless systemswireless systems

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