Pulse or digital communications – Repeaters – Testing
Patent
1982-07-19
1984-11-27
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
364728, 375 96, 375 97, H04B 1500
Patent
active
044854773
ABSTRACT:
A decoder for decoding received pseudo random sequence (PRS) codes modulated upon a carrier signal and having an original chip rate f.sub.c, and for correcting for unknown frequency shifts in the received PRS codes. The decoder includes a local oscillator for demodulating the carrier signal and detecting the received PRS codes and a signal source for generating X correction PRS codes each having a pattern of chips similar to the chip pattern of a predetermined one of the received PRS codes and each shifted in chip rate from f.sub.c by amounts which will provide a spectrum of frequencies spanning any expected frequency shift of a received PRS code. Also provided is a correlator for correlating each of the X correction PRS codes with each received PRS code at a rate f.sub.r to determine which particular correction PRS code produces the greatest correlation signal, where f.sub.r >>f.sub.c. Further logic is responsive to the chip rate of the particular correction PRS code for correcting the output frequency of the local oscillator to compensate for the unknown frequency shift during the reception of subsequently received PRS codes.
REFERENCES:
patent: 3868686 (1975-02-01), Magorian
patent: 4042925 (1977-08-01), Albanese et al.
patent: 4328588 (1982-05-01), Smithson
patent: 4418393 (1983-11-01), Zscheile, Jr.
Phillion Donald W.
RCA Corporation
Safourek Benedict V.
Tripoli Joseph S.
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