Download e-book for kindle: Broadband Communications via High-Altitude Platforms by David Grace

By David Grace

A special booklet with systematic and thorough insurance of HAP similar concerns, difficulties and options. Handbook of Broadband Communications from excessive Altitude Platforms presents an intensive assessment and state-of-the-art of the HAP permitting applied sciences, in addition to describing contemporary learn actions with such a lot promising effects. It outlines the roadmap for destiny improvement of HAPs.

  • Focuses on putting HAPs within the standpoint of present and destiny broadband instant conversation platforms, supplying the readers with an outline of the limitations affecting HAP-based broadband communications
  • Provides an intensive evaluation of HAP permitting applied sciences, describes contemporary learn actions with such a lot promising effects, and descriptions the roadmap for destiny improvement of HAPs
  • Covers allowing applied sciences and economics of HAP-based communique procedure together with matters on the topic of aeronautics, energetics, working situations, purposes and company modeling
  • Examines the working setting, complex verbal exchange strategies for effective radio hyperlink source administration, and appropriate antennas
  • Addresses multiplatform constellations, featuring the a number of HAP constellation making plans technique and discussing the networking implications of utilizing a number of HAPs

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3 Multipoint Distribution Services for Multimedia Applications – MMDS and LMDS By restricting the scope of HAPs to delivery of asymmetric broadband services for fixed users only, two further standards appear interesting for the use on HAPs, the Local Multipoint Distribution Services (LMDS) and Multichannel Multipoint Distribution Services (MMDS). LMDS and MMDS have adapted the DOCSIS (Data Over Cable Service Inferface Specification) from the cable modem world. The version of DOCSIS modified for wireless broadband is known as DOCSIS þ .

A broadband wireless link and applications. Using an uprated mm-wave WLAN payload with on board server, a number of broadband applications were tested, such as video download and web-page download. 11b technology used at the time. This payload used the 28/29 GHz bands, within band allocations permitted by the Swedish authorities. To overcome the problems of the lack of station-keeping on a free flying balloon, wide area coverage from the balloon was achieved using a lens antenna. A tracking antenna on the ground was used to achieve the link budget.

For broadband wireless access provision via HAPs the signal may need to be upconverted to mm-wave frequencies, whereas for rapid establishment of ad hoc networks in emergency scenarios the equipment may as well be used in its nominal band. There are several studies reporting on range extension of WLAN networks, however, data rates achieved in such adapted systems are rather low and are not likely to justify system implementation and HAP deployment. 11b protocol, in particular, seems to be adaptable to HAP operating environment.

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