Pulse or digital communications – Repeaters – Testing
Patent
1984-11-16
1986-11-04
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
364728, 375 96, 375115, H04K 100
Patent
active
046213651
ABSTRACT:
A device is disclosed which simultaneously performs sync preamble correlation detection and frequency offset estimation functions for a spread spectrum receiver. The device performs a parallel frequency search, executed by a plurality of frequency sensitive circuit channels connected in parallel. These parallel circuit channels first apply phase corrections to the subcorrelator outputs and then linearly reintegrate the corrected outputs. In each channel the phase corrections applied to each successive subcorrelator output vary with the frequency offset subregions to which the channel is designed to match. By applying approximated phase corrections of 0.degree., 90.degree., 180.degree. or 270.degree. in lieu of the exact phase corrections required to remove the phase shift, the need for multiplication operations in the reintegration process is eliminated, as well as the need for storing large numbers of weighting coefficients. As a result, the reintegration process involves only addition and subtraction operations and the non-linear integration process is eliminated. The detector also establishes an estimate of the input signal frequency offset at the time of detection of the preamble correlation.
REFERENCES:
patent: 3614623 (1971-10-01), McAuliffe
patent: 3944929 (1976-03-01), Matsuo
patent: 4007331 (1977-02-01), Flanagan
patent: 4022973 (1977-05-01), Stackhouse et al.
patent: 4112372 (1978-09-01), Holmes et al.
patent: 4188580 (1980-02-01), Nicolai et al.
patent: 4244026 (1981-01-01), Dickey, Jr.
patent: 4291410 (1981-09-01), Caples et al.
patent: 4346475 (1982-08-01), Alexis
patent: 4398062 (1983-08-01), McRae et al.
patent: 4424514 (1984-01-01), Fennell et al.
patent: 4430742 (1984-02-01), Milleker et al.
patent: 4453259 (1984-06-01), Miller
patent: 4484335 (1984-11-01), Mosley
patent: 4528674 (1985-07-01), Sweeney et al.
Chin Stephen
Griffin Robert L.
Hughes Aircraft Company
Karambelas Anthony W.
Lambert Howard R.
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