Radio communication system using spread spectrum techniques
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United States of America Patent
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-
Dec 31, 1991
Grant Date -
N/A
app pub date -
Apr 9, 1990
filing date -
Apr 9, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A spread spectrum radio communication system includes a generator for generating a pseudo-random chipping sequence, a frequency spreader for combining digital data with the pseudo-random chipping sequence to produce a spread spectrum signal, a modulator for modulating the spread spectrum signal for broadcasting over a predefined frequency band, a demodulator for demodulating broadcast spread spectrum signals, a de-spreader that employs single bit quantization and oversampling for digitally correlating the output of the demodulator means with a pseudo-random chipping sequence, and an extractor for extracting clock and data signals from the output of the de-spreader. The chipping sequence is normally selected from a set of codes including an eleven-bit Barker code, its inverse and reversals of the inverse and non-inverse code.
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