Spread spectrum receiver using partial correlations

Details Spread spectrum receiver using partial correlations Spread spectrum receiver using partial correlations

1994-01-25

1996-11-26

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375325, 375326, 375339, 375343, 375344, 375354, 329302, 329306, 329323, 329358, 36472803, H04B 1500

Patent

active

055793380

ABSTRACT:
A complex baseband signal as long as one period of PN signal is divided into three sequences. The three partial signals are input to three correlators which then calculate the correlations between the three partial signals and three partial PN signals. The squares of the absolute values of outputs from the three partial correlators are summed and the peak of the resultant summed signal is detected, thereby performing initial acquisition and tracking of synchronization of PN signal. Outputs from the three partial correlators are added together by an adder for generating a correlation signal used for data demodulation. Since partial correlation signals output from three partial correlators have a phase difference corresponding to a frequency offset, and error signal corresponding to the frequency offset is provided by performing complex conjugate product operations on the partial correlation signals. Thus, data demodulation, initial acquisition, synchronization tracking and error signal generation can be performed by using identical partial correlators.

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patent: 5127021 (1992-06-01), Schreiber
patent: 5151919 (1992-09-01), Dent
patent: 5218619 (1993-06-01), Dent
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patent: 5237587 (1993-08-01), Schoolcraft
Mutsumu Serizawa & Koji Ogura "A Carrier Frequency Offset Detection Scheme Utilizing Correlation w/a priori Known Sequence " Dec. 1992 vol. J 75-B-II No. 12 pp. 884-895.

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