Full-duplex, sub-band spread spectrum communications system
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United States of America Patent
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Jun 18, 1991
Grant Date -
N/A
app pub date -
Mar 20, 1990
filing date -
Mar 20, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved spread spectrum communications system is provided for establishing full-duplex voice/data radio communications within a single specified FCC ISM band. Spectrum spreading is performed relative to a plurality of sub-bands respectively defined about the lower and upper band-edges of the prescribed ISM band and having spectral roll-off characteristics which satisfy FCC requirements for radio frequency radiation outside the ISM bands on the corresponding band-edges thereof. Full-duplex operation is implemented by the use of digital MSK modulation and associated filtering in order to conserve available bandwidth and accommodate the filtered, modulated signal within the sub-bands defined in the prescribed ISM frequency band, and the system is capable of being easily interfaced to related digital communications services.
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