Technology for Mobile Broadband

Bill SullivanManaging Director, Mobile Broadband Systems

Carlsbad, CA

Satellite ForumViaSat BackgroundViaSat Background

VSAT Products

AntennaSystems

Consumer Broadband

GovernmentProducts

Satellite ForumViaSat Broadband in the SkyViaSat Broadband in the Sky ConneXion by Boeing

Airborne transceivers Ground transceivers

SKYLink by ARINC Direct Airborne integrated

terminals including antennas

Complete ground infrastructure

7 x 24 network ops

Satellite Forum

The Satellite Mobile Broadband ProblemThe Satellite Mobile Broadband Problem

Downlink Power Spectrum

-40

-35

-30

-25

-20

-15

-10

-5

0

-20 -15 -10 -5 0 5 10 15 20

Frequency Offset from Carrier Center (Mhz)

Pow

er D

ensi

ty (

dBc)

ComplexTrade-off

SatelliteBandwidth and Power

Waveform Design

Network Management

AntennaSize &

Complexity

Regulatory

Satellite Forum

Key Technologies forSatellite Mobile BroadbandKey Technologies forSatellite Mobile Broadband

CDMA spread spectrum waveforms THE enabler of mobile broadband on FSS satellites

Innovative antenna apertures Antenna pointing & tracking Aggressive error correction codes Bandwidth recovery techniques Outage mitigation features Mobile IP networking

Satellite Forum

TDMA/FDMACDMA

Waveform

.5 Degree

CDMA = Mobile at Ku-BandCDMA = Mobile at Ku-Band Standard Ku antennas

have narrow beamwidths

Small antennas needed for mobile systems too wide

CDMA waveform reduces adjacent satellite interference

FDMA/TDMAWaveform

6 Degree

EffectiveCDMASpread

SpectrumWaveform

FDMA/TDMAWaveform

6 Degree

Satellite ForumAntenna SubsystemsAntenna Subsystems

KVH

Antenna aperture Low profile Small footprint

Pointing / tracking Accuracy vs. cost Smaller antennas can meet regulatory

limits with less accuracy Integrated design is key!!

Waveform Network management

ViaSat’s CDMA waveform & network managementenable these very small antennas

Satellite ForumWaveform DesignWaveform Design

Aggressive forward error correcting codes Turbo, PCCC, SCCC & others

Spread spectrum

Outage mitigation Burst CRMA Expanded interleaving HTTP caching Alternate media routing

Downlink Power Spectrum

-40

-35

-30

-25

-20

-15

-10

-5

0

-20 -15 -10 -5 0 5 10 15 20

Frequency Offset from Carrier Center (Mhz)

Pow

er D

ensi

ty (

dBc)

Satellite ForumPCMA Hub Cancellation

Gateway Downlink View Remote Downlink View

Gateway transmits Uplink signalGateway transmits Uplink signal Gateway cancels its received signalGateway cancels its received signal Subscriber Terminal transmits a return linkSubscriber Terminal transmits a return link

Return link power too low to interfere with Outbound

Return link above residual of cancelled Outbound Uplink

Gateway receives inbound return links from remotesGateway receives inbound return links from remotes

Satellite ForumMobile Broadband Future??Mobile Broadband Future??

Smaller & smaller antennas Innovative system architectures

Other frequency bands? C-band for non-maritime? Ka-band??

Press to reduce cost Cheaper bandwidth Cheaper equipment

Satellite ForumSummarySummary

Major shift in mobile satellite communications towards true broadband Mainstay low-rate heritage systems (e.g., Inmarsat)

will remain and evolve New Ku systems moving rapidly to market

ViaSat will remain a key player Innovative system architectures Aggressive new products