Carrier frequency correction for a DSSS communication system
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United States of America Patent
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Apr 12, 1994
Grant Date -
N/A
app pub date -
Dec 31, 1992
filing date -
Dec 31, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method for carrier frequency correction in a direct sequence code division multiple access communication system having a carrier frequency, consisting of an expected carrier frequency and a carrier frequency error, modulated by a pseudo-noise code. A local frequency is produced equal to the expected carrier frequency. Received signals are demodulated of the pseudo-noise and mixed with the local frequency. The demodulated signals consist of in-phase signal components and quadrature signal components and the carrier frequency error. Each of the demodulated signal are converted to digital samples. Each signal digital sample is multiplied by stored digitized samples of a plurality of sinusoidal tones to produce a product corresponding to each tone. Each product corresponding to each tone is squared. The resulting squared products are compared to determine which squared product has the maximum value. The tone which corresponds to the squared product with the maximum value substantially equal to the carrier frequency error. The local frequency is adjusted to compensate for the carrier frequency error.
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