QAM detector which compensates for received symbol distortion induced by a cellular base station
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United States of America Patent
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Jun 17, 1997
Issued Date -
N/A
app pub date -
Jul 24, 1995
filing date -
Oct 4, 1991
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A cellular subscriber modem for receiving CCITT-type quadrature amplitude modulated (QAM) signals. The cellular modem includes a novel symbol detector that converts received symbol information to polar notation. The detector's constellation thresholds include a circular threshold having a radius greater than the magnitude of the innermost symbols, but less than the magnitude of the outermost symbols, and radially spaced thresholds, which further discriminate between the outermost symbols. As a result, special cellular-compatible modem equipment need not be connected between the public-access switched telephone network and the computer equipment at the other end, which means that a CCITT-compatible cellular subscriber modem can then be treated as any other type of CCITT-modem. The detector may be implemented in the software of a standard modem processor, or as several analog comparator circuits.
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