System using a split correlator for frequency compensating a pha

Details System using a split correlator for frequency compensating a pha System using a split correlator for frequency compensating a pha

1995-04-19

1996-10-15

Tse, Young T.

Pulse or digital communications

Repeaters

Testing

375367, 370107, 342189, H04K 102

Patent

active

055662021

ABSTRACT:
A system which receives a pseudonoise sequence signal, quantizes the signal during a fixed increment of time, and passes the quantized signal to a single "split" correlator channel. The system utilizes sub-correlation products from that single "split" channel to calculate correlation outputs of other desired correlation channels. Specifically, the "split" correlator channel includes a pair of shift register strings, with the corresponding stages of each string being of equal length, and with a phase rotator being provided between consecutive stages of the shift register strings. In-phase and quadrature components of the received signal are each provided as inputs to a respective one of the shift register strings, and each shift register string stage is correlated with the pseudonoise sequence. These correlation results are utilized to calculate overall correlation scores for each of two substantially equal subdivisions of a range of frequencies centered around a nominal carrier frequency for the received signal to detect acquisition of the received signal and to select the frequency range subdivision with the greatest correlation.

REFERENCES:
patent: 4621365 (1986-11-01), Chiu
patent: 4707839 (1987-11-01), Andren et al.
patent: 5016255 (1991-05-01), Dixon et al.
patent: 5022047 (1991-06-01), Dixon et al.
patent: 5179573 (1993-01-01), Paradise
patent: 5184135 (1993-02-01), Paradise
patent: 5285472 (1994-02-01), Leonard et al.

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