Pulse or digital communications – Repeaters – Testing
Patent
1983-08-22
1985-07-16
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 9, 375115, H04K 104
Patent
active
045301034
ABSTRACT:
A method and apparatus for baseband synchronizing of a local PN code sequence with a received PN code sequence incorporated in a received spread spectrum signal is provided. The received spread spectrum signal is translated to baseband to produce an I (in-phase) channel baseband signal and a Q (quadrature-phase) channel baseband signal. Data and error baseband correlators correlate the I channel and Q channel baseband signals with in-phase and quadrature-phase PN signals incorporating the local PN code sequence to produce despread on-time, advanced and delayed I channel and Q channel baseband signals. These despread baseband signals are processed and combined to produce an error signal proportional to a difference between the local PN code sequence and the received PN code sequence. A numerically-controlled oscillator circuit is responsive to the error signal to advance or delay the phase of a reference PN clock signal used to form a local PN clock signal. In operation, the rate of reading the local PN code sequence is accelerated or retarded to synchronize the local and the received PN code sequences.
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Bortnyk George P.
Mosley, Jr. William H.
Sanders David E.
Chin Stephen
Crowder, Jr. Albert M.
E-Systems Inc.
Griffin Robert L.
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