Technology for Mobile Broadband

1
Technology for Mobile Broadband
Bill Sullivan Managing Director, Mobile Broadband
Systems Carlsbad, CA
2
ViaSat Background
Government Products
Antenna Systems
Consumer Broadband
VSAT Products
3
ViaSat 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

4
The Satellite Mobile Broadband Problem
Waveform Design
Satellite Bandwidth and Power
Complex Trade-off
Network Management
Antenna Size Complexity
Regulatory
5
Key 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

6
CDMA Mobile at Ku-Band

• Standard Ku antennas have narrow beamwidths
• Small antennas needed for mobile systems too wide
• CDMA waveform reduces adjacent satellite
  interference

7
Antenna Subsystems

• 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

KVH
ViaSats CDMA waveform network
management enable these very small antennas
8
Waveform Design

• Aggressive forward error correcting codes
• Turbo, PCCC, SCCC others
• Spread spectrum
• Outage mitigation
• Burst CRMA
• Expanded interleaving
• HTTP caching
• Alternate media routing

9
PCMA Hub Cancellation

• Gateway transmits Uplink signal

• Gateway cancels its received signal

• Subscriber Terminal transmits a return link

• Gateway receives inbound return links from remotes

Return link above residual of cancelled Outbound
Uplink
Return link power too low to interfere with
Outbound
Gateway Downlink View
Remote Downlink View
10
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

11
Summary

• 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