WiMAX Interfering with Satellite Communications

13.03.2008 03:07 VoIP Asterisk

- Source: Asterisk

The Satellite Users Interference Reduction Group (SUIRG) has published the results of tests it has carried out which is warning that WiMAX communications pose a significant interference threat to satellite signals transmitted in the satellite C-band frequency.

The C band is highly associated with TVRO satellite reception systems, commonly called "big dish" systems since small receiving antennas are not optimal for C-band systems. Typical antenna sizes on C-band capable systems ranges from 7.5 to 12 feet (2.5 to 3.5 meters) on consumer satellite dishes, although larger ones also can be used.

A typical C band satellite uses 3.7–4.2 GHz for downlink, and 5.925–6.425 GHz for uplink. C band is primarily used for open satellite communications, whether for full-time satellite TV networks or raw satellite feeds, although subscription programming also exists.

The primary objective of the research was to measure interference levels generated by fixed WiMAX transmissions into an FSS satellite receiving station. The method employed taking measurements of C/N (carrier/noise), I/N (interference/noise), BER (bit error rate), and spectrum plots of a satellite down link video channel.

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