Method and apparatus for monitoring a redundant (standby) transmitter in a radio communications system
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United States of America Patent
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Aug 10, 2010
Grant Date -
Dec 9, 2004
app pub date -
Jun 27, 2002
filing date -
Jul 6, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A method for monitoring a redundant (passive) transmitter, being, for example, part of a base station of a point-to-multipoint radio communications system transmits, during normal operation, a spread-spectrum signal over the redundant transmitter, the spread-spectrum signal being of low spectral power in comparison with data signals being transmitted by the active transmitter of the base station. One or more receivers are associated, for example, with terminal stations in communication with the base station and detect the presence of the spread-spectrum signal. If the spread-spectrum signal is not found to be present, the receivers provide an indication of this, and from this indication, a decision is made as to the integrity of the redundant transmitter.
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