MIMO NLOS Systems - · PDF fileFixed Broadband Wireless: NLOS Systems Rajeev Krishnamoorthy VP, Technology Iospan Wireless

Fixed Broadband Wireless:NLOS Systems

Rajeev KrishnamoorthyVP, TechnologyIospan Wireless

Business Drivers

Iospan Wireless, Inc. // Company Confidential / February 2002 / Page 3

Fixed BB Wireless Access Market

Large Business

Small & Medium Business

SOHO and Telecommuter

Mass Residential

Intranet/Extranet VPNs Toll-BypassPBX ExtensionLong Distance

Retail InternetAccess Residential Voice

Business InternetAccess

Access VPNResidential VoiceRemote PBX Extension

Business InternetAccess

Managed Broadband Pipes

Iospan Targets


Network Architecture

T1/Analog Voice

PBX

NSÜ

NSÜ

NSÜ

Integrated Services onHigh BW Dynamic Pipe IP, ATM Core

ADMADM

ADM

Metro Fiber

Enterprise

PSTN

DNSDHCPTFTP

OAM&P NOC

ISP

Cell SiteAccess Shelf PA, AntennasAlarms,..

Service Provider Metro & Core Network Service Provider (NSP)NOC Management Servers

(DHCP, DNS, TFTP, …)

Customer Premise Equipment (CPE)


Exploring Alternate Access

LMDSPure Line of SightHigh Fade Margins in Indian Monsoon - Small RangesHigh cost of equipment

xDSLCopper Plant ConditionLoop Unbundling

Lower Frequency Wireless


SP Requirements

Requirements

Infocom Market Focus SMB SOHO HER

Non-LOS Performance (K=0)

Reliability & QoS

Cellular – Outdoor/Indoor CPE (4-6 miles)

Low Cost ($/sub)

High Data Rates (10Mbps+ Peak)

Feature Parity With Legacy Services


Airburst Service Provider Economics

Multi-Service Platform (Data and Voice) - Broadband User Experience

Low Cost Per SubscriberHigh capacity w/ 75% fewer base stationsHigh coverage(> than 90% subscriber penetration)High Frequency Re-useIndoor/Outdoor CPE Installations

Wireline Performance (Fading and Interference Mitigation)

Peak Data Rates - 14 Mbps Today, 50 Mbps ‘03High QoS - Service Level AgreementWireline Availability

Scalability - Multi-Cell Architecture

Non-LOS Channels


Wireless ImpairmentsFading Co-Channel Interference

time -15

-10

-5

0

5

10

Time-Selective Fading

frequency- 1 5

- 1 0

- 5

0

5

1 0

Frequency-Selective Fading

space -15

-10

-5

0

5

10

Space-Selective Fading

��

��

��

1

1 1

2 2

2

3 3

-15

-10

-5

0

5

10

C

I


Spatial Processing System

Tx

RF

RF

RF

PHY

Rx

RF

RF

RF

PHY

RF

RFPHY

Rx

MAC/RLP

RF PHY

MAC/RLP

CPEBTSTx


Diversity Enables Better CoverageSi

gnal

/Noi

se

Noise FloorMIMO

SISO

Range


Diversity Enables Better Reuse

Sign

al /

Intf

. Rat

io

MIMOInterference

SISO

AggressiveWeakReuse


Spatial Multiplexing Increases Speed

SINR

BPS

/Hz

10 dB 20 dB0

20

2x3

1x1


Building Blocks

Reliability

Peak Data RatesCapacity

Scalability &Reuse

MAC/RLPARQ

InterferenceCancellation

Hyper Diversity

Non-LOSRobustness

SpatialMultiplexing

&Adaptive

Modulation

Data RatesPoor BEROperation


IEEE Channel Models

Extensive in-house channel measurements - Models characterize:

Rician K-factor vs. range, NAU height, antenna beamwidthChannel selectivity in frequency, time (Doppler, Delay Spread)Antenna Correlation and XPD modelsAntenna Gain Reduction FactorPath Loss Models


MIMO - Entering All StandardsC

ell S

ize

Mac

ro

AirBurst

WCDMA-----------IS-2000

Loca

lM

icro

4G (MIMO-OFDM)

Hiperaccess

802.16

BTooth

MIMO

MIMO

MIMO

MIMO

802.11aHiperlan

0.2 2 20 200

Data Rate MBPS

System Solution


AirBurst Network Architecture

T1/Analog Voice

PBX

NSÜ

NSÜ

NSÜ

Integrated Services onHigh BW Dynamic Pipe IP, ATM Core

ADMADM

ADM

Metro Fiber

Enterprise

PSTN

DNSDHCPTFTP

OAM&P NOC

ISP

Cell SiteAccess Shelf PA, AntennasAlarms,..

Service Provider Metro & Core Network Service Provider (NSP)NOC Management Servers

(DHCP, DNS, TFTP, …)

Customer Premise Equipment (CPE)


Cellular Network DeploymentDemand Dependent Cell Radius

f1

f2f3

f1

f2f3

f1

f2f3

f1

f2f3

3 sectors per cell2Tx, 3 Rx Antennas ABS10000

2 MHz, 1.75 MHz Channel settings per sector (Up or Down)48 MHz FDD SeparationAdaptive Modulation per Subscriber

14 slots, 14 Mbps/slot Peak ThroughputEach line card serves a Up or Down ChannelFlexible ConfigurationFrequency re-use of 1x3

Interference Cancellation


Airburst PHY and MAC Features

PHYOFDM Modulation - Robust for Broadband MIMO

Diversity Mode - Eliminates FadingSpatial Multiplexing - Increases Spectral Efficiency12 Adaptive Modem Modes - 6 Diversity, 6 SM

10x better spectral efficiency than 3G systemsMAC

ATM-like Fragmentation / Re-assembly Advanced ARQDown Link scheduling - GoS, QoS SupportUp link scheduling - Request/GrantCBR, CIR Support - Voice, Leased Lines


End to End QoS

Packet Classification AirBurst QoS Mapping Function Transport QoS

CIR

BE

Gold (ATM CBR VC)

Silver (ATM VBR VC)

Bronze (ATM UBR VC)

CBR

Service Provider CoreAAD300 ABS10000

Class of Service (CoS)

Subscriber Based Service ProfilesRES, SOHO, SME

CBR Constant Bit Rate (Gold)CIR Committed Information Rate (Silver)BE Best Effort (Bronze)


Diversity: Throughput & Coverage

Throughput & coverage for Uplink under-the-eaves self-installed CPE

Example: cell radius = 6km

2x3 System (MIMO)1x1 System (SISO) 1x2 System (SIMO)2x3 System (MIMO)

0 1134 2268 3402 4536 5670 68040

0.05

0.1

0.15

0.2

0.25

0.3

0.35

Net data rate (kb/s)

Rat

io o

f use

rs

Histogram of the net data rate (kb/s)

Non Covered

0 1134 2268 3402 4536 5670 68040

0.05

0.1

0.15

0.2

0.25

0.3

0.35


Rat

io o

f use

rsHistogram of the net data rate (kb/s)

Non Covered

0 1134 2268 3402 4536 5670 68040

0.1

0.2

0.3

0.4

0.5

0.6

0.7


Rat

io o

f use

rs

Histogram of the net data rate (kb/s)

Non Covered

Mass DeploymentG1.5G1


Airburst Performance Outline

Fixed Wireless Access Channel CharacterizationPHY Level Performance

Modem Set Points: Operating signal-to-noise-plus-interference ratio to meet PER and availability targets

Link Level PerformanceLink Adaptation Performance

System Level performanceCoverage (Cell radius @ 90% area reliability)Capacity (Mbps/Cell/Hz)Frequency Reuse


System Coverage

NAUinstallation

Desktop (DT) Low eaves (LE) High eaves (HE) Rooftop (RT)

Antenna &pointing

Omni-antennarandom pointing

90deg antennaBest wall pointing.

90deg antenna,Best wall pointing.

90deg.Pointing toward BTS

Height 1.5 meters 2.5 meters 4 meters 7.5 meters

Cell Size @ 90% coverage (kms)

0

2

4

6

8

10

12

14

DT LE HE RT

NAU type

cell

size

(km

s)

Micro-cell (15m BTS) Macro-cell (30m BTS)

Random K factor and Delay Spread According to Models


S-T Processing- Coverage & Reliability

Cell Planning, Deployment, & Provisioning

99.99% reliability99.99% reliability30 dB gain30 dB gain⇒⇒ 4 times distance reach4 times distance reach

(16 times coverage)(16 times coverage)


Link Budget Gains

Coverage30 dB results in about 4x radius (~16x in coverage area, or subs)

Data Link Rate30 dB results in 4-8x data rate increaseSpatial Multiplexing adds another factor of 20 - 100% on top of this

Reuse30 dB results in reuse improvement of ~4We are targeting 1x3; competition is 4x3 or worse

CapacityIncreases 16 or greater based on link rate and reuse

Cost30 dB will result in PAs, heat sink, power supply, boards, etc. which are considerably cheaper at both ends


Link Budget Gains (2)

Interference Mitigation and CancellationResults in better frequency reuse, better signal quality (higher SNR) and higher user data rate and capacity

Dynamic Link AdaptationResults in lower SINR margin to guarantee data rates, availability, and QoSConsequently results in better frequency reuse and easier cell planning

Spatial MultiplexingResults in doubling the data rate

Wider CPE Beam-widthResults in easier installation (makes self install possible)Enables easier cell-splitting to scale as capacity demands grow

Products & Trial


AirBurst Base Station -ABS10000

AirBurst TF1000

17.5”

Power10 MHz

TF1000RF Combine &Timing

RedundantCooling

ABS10000Channel Assembly 17.2”

ABS10000 ChassisAll Carrier Class Features - FutureMultiple Sector Modular DesignOC-3, DS3/E3 WAN InterfaceRemote Diagnostics


AirBurst Access Device - AAD300

FAXExisting RJExisting RJ--11 wall jack11 wall jack

10/100 baseT Ethernet10/100 baseT Ethernet

PC

Existing Existing RJRJ--11 wall jack11 wall jack

Existing dual pair wiringExisting dual pair wiring

Line 1Line 1 Line 1Line 1

Line 2Line 2LineLine 11

PCPCPC

Indoor Table Topor Outdoor Under Eaves(Ceiling, Wall Mount Options)

1 Ethernet1 Tx, 3Rx AntennasBridge, PPPoE ModePower - 30dbm (outdoor)

FutureFuture

RF INRF IN


Trial In-Progress

Documents

MIMO NLOS Systems - · PDF fileFixed Broadband Wireless: NLOS Systems Rajeev Krishnamoorthy VP, Technology Iospan Wireless