Technology for Mobile Broadband Bill Sullivan Managing Director, Mobile Broadband Systems Carlsbad, CA

Satellite Forum ViaSat Background VSAT Products Antenna Systems Consumer Broadband Government Products

Satellite Forum ViaSat Broadband in the Sky n ConneXion by Boeing  Airborne transceivers  Ground transceivers n SKYLink by ARINC Direct  Airborne integrated terminals including antennas  Complete ground infrastructure  7 x 24 network ops

Satellite Forum The Push to Mobile Broadband n Several recent advances pressing mobile broadband  Cable/DSL roll-out  WiFi hot spots  Cellular packet data  Mobile DBS  Shipboard internet cafes n Broadband becoming ubiquitous n True mobile broadband  Lots of bandwidth  High speeds for subscribers

Satellite Forum Mobile vs. Transportable n Transportable:  Lightweight packaging  Easy rapid set-up  Move, set up and then communicate n Mobile:  Communications while in motion

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

Satellite Forum Key Technologies for Mobile Broadband n CDMA spread spectrum waveforms  Huge enabler of mobile broadband n Innovative antenna apertures n Antenna pointing & tracking n Aggressive error correction codes n Bandwidth recovery techniques n Outage mitigation features n Mobile IP networking

Satellite Forum TDMA/FDMA CDMA Waveform.5 Degree CDMA = Mobile at Ku-Band n Standard Ku antennas have narrow beamwidths n Small antennas needed for mobile systems too wide n CDMA waveform reduces adjacent satellite interference FDMA/TDMA Waveform 6 Degree Effective CDMA Spread Spectrum Waveform FDMA/TDMA Waveform 6 Degree

Satellite Forum Antenna Subsystems KVH n Antenna aperture  Low profile  Low footprint n Pointing / tracking  Accuracy vs. cost  Smaller antennas can meet regulatory limits with less accuracy n Integrated design is key!!  Waveform  Network management

Satellite Forum Waveform Design n Aggressive forward error correcting codes  Turbo, PCCC, SCCC & others n Spread spectrum n Outage mitigation  Burst CRMA  Expanded interleaving  HTTP caching  Alternate media routing

Satellite Forum PCMA Hub Cancellation Gateway Downlink ViewRemote Downlink View  Gateway transmits Uplink signal  Gateway cancels its received signal  Subscriber 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 remotes

Satellite Forum Mobile Broadband Future?? n Smaller & smaller antennas  Innovative regulatory approaches n Other frequency bands?  C-band for non-maritime?  Ka-band?? n Press to reduce cost  Cheaper bandwidth  Cheaper equipment

Satellite Forum Summary n 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 n ViaSat will remain a key player  Innovative system architectures  Aggressive new products