BroadbandFixed Wireless

2N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

1 GHz 2.5 3.5 5.8 10 24 26 28 38 40 60

LOSLOS

5000200013501000400 30020020 30

Voice, Data, Fax,

ISDN256 Kbps256 Kbps

1 to 501 to 50MbpsMbps

+ TDMLeased Lines

Ban

dwid

th(M

Hz)

1400200

100

Spectrum Availability

+ High SpeedInternet and Multimedia

+ UltraHigh-SpeedLAN/WAN

No LOSNo LOS

10 to 10010 to 100MbpsMbps

>100 Mbps>100 Mbps

LMDSMMDS UNII

2Ghz to 40GhzUnlicensed National Information InfrastructureMultichannel Multipoint

Distribution ServiceLocal Multipoint Distribution Service

3N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

1 GHz 2.5 3.5 5.8 10 24 26 28 38 40 60

LOSLOS

5000200013501000400 30020020 30

Voice, Data, Fax,

ISDN256 Kbps256 Kbps

1 to 501 to 50MbpsMbps

+ TDMLeased Lines

Bandwidth(MHz)

1400200

100

Spectrum Availability Worldwide

+ High SpeedInternet and Multimedia

+ UltraHigh-SpeedLAN/WAN

No LOSNo LOS

10 to 10010 to 100MbpsMbps

>100 Mbps>100 Mbps

4N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

MMDS

• MMDS - Multichannel Multipoint Distribution Service

• FCC regulated wireless cable system• Delivery of multiple video signals via point-

to-multipoint microwave transmissions• Comprised of 33 microwave frequencies in

2.5 GHz band

5N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

UNII

• UNII – Unlicensed National Information Infrastructure

• Located in 5.2 – 5.8 GHz bands

6N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

LMDS

• LMDS – Local Multipoint Distribution Service• Located in 28 GHz and 31 GHz bands• Broadband radio service designed to provide

two way transmission of voice, high speed data and video

• Low powered transmitters broadcast voice, data and video signals in metropolitan areas

7N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

Spectrum: Horses for Courses

• Less than 6 GHzLong range (up to 30 miles), Non LOS, not affected by weatherLow-cost equipment - residential and SOHO CPESpectrum suitable for mass market deployments

• Greater 6 GHzLOS, short range (1-3 miles), affected by weather, more spectrum (1Ghz)Spectrum used specifically for urban deployments to Large business or Multi-tenant units

8N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

Reach Distance From Hub

Point-to-Point Links Point-to-Multipoint

28 GHz

38 GHz

5.34 6.92 Reach Distance*, Km

*Assume Rain Zone K, Single Channel per Transmitter, same power, same dB gain antennaes for all frequencies.

Reach Distance**, Km

**Assume Rain Zone K, 6cm antennae for 99.995% average availability, vertical polarization.

3.57 7.5 5.0

2.5 GHz

20.050.0

23 GHz

6 GHz

28 GHz

2.5 GHz

24 GHz

40

9N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

P2P vs P2MP

P2Pdedicatedbandwidth

P2MP shared

bandwidth

P2MP Sector

10N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

Cost per Subscriber by Network

CPE Cost

PTP

PMP

# of Subscribers

Cos

t Per

Sub

scrib

erThis is the point at

which PMP becomes more economically viable than

a PTP network, generally ~8 links.

11N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

Unified Broadband Wireless Reference Architecture

Standard I.F.

WirelessServiceModules

Small Office

Branch Office

SOHOTelecommuter

PBX

CPENetworks

End-to-End Services, Network Management,Provisioning AND Billing

Backhaul Network

FCC Compliant R.F.

IPATMWDM

FR

Any RF band Consumer

38 GHZ38 GHZRadioRadio

LMDSLMDSRadioRadio

UNIIUNIIRadioRadio

MMDSMMDSRadioRadio

10 GHZ10 GHZRadioRadio

38 GHZ38 GHZRadioRadio

LMDSLMDSRadioRadio

UNIIUNIIRadioRadio

MMDSMMDSRadioRadio

10 GHZ10 GHZRadioRadio

IndustrySuppliers

IntegratedWireless MAC

38 GHZ38 GHZRadioRadio

OtherOther

SATSAT

12N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

Key Features

• IP Packet Based Solution with DOCSIS 1.1 support• Up to 44.4 Mbps full-duplex throughput• Up to 25 Miles in connection distance• Fiber quality link

> 10-11 BER for Data, > 10-8 BER for Voice

• Supports both MMDS (2.5 GHz) and UNNI (5.7 GHz)• Encryption support: 56 bit DES with RSA key

management

13N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

The Problem

“

”

Line-of-Sight:

The technology, while promising, continues to have nagging "line-of-sight" issues. Wireless signals in these systems must have a clear path to travel as they bounce from rooftop to rooftop. Trees, buildings and even inclement weather, such as snow and pelting rain, can cause static, dropped calls and hazy connections.

Leslie Cauleystaff reporter in The Wall Street Journal's New York bureau

September 20, 1999

14N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

The Solution

• VOFDM (Vector Orthogonal Frequency Division Multiplexing) technology

• employs both frequency and spatial diversity

• creates a robust processing technique for multipath fading and narrow band interference

• VOFDM enables greater coverage

• substantially reduces LOS limitations

…

SubscriberBase Station

Paths

…

15N+I_2k © 2000, Peter Tomsu 03_bb_fixed_wirel

Transmit Spectrum

Receive Spectrum

Channel Training ToneData Tone

What is VOFDM?

• Each VOFDM burst carries data and training

Allows for variation inthe channelReduces effect of frequency offset

• VOFDM, interleaving and coding

Create a robust processing technique for multipath fading and narrow band interference

Questions ???