Spread spectrum open loop data recovery processor

Details Spread spectrum open loop data recovery processor Spread spectrum open loop data recovery processor

1993-07-16

1996-06-11

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

375206, 375208, 380 34, H04B 169, H04B 1707

Patent

active

055263895

ABSTRACT:
A spread spectrum open loop data recovery processor receives a single information channel bi-phase modulated RF signal and combines it with a locally generated fixed frequency signal having an accuracy of at least 5 ppm. A balanced demodulator combines the received and local signals to derive an `I` and a `Q` analog information signal. The remote transmitter modulates both channels with the same information. The `I` and `Q` analog signals `slip` with respect to one another. The accuracy of the fixed frequency signal insures that the rate of slip does not exceed the ability of the data recovery processor to attain an error rate of better than 1 ppm. The `slip` results in both analog signals periodically going through null. The quadrature phase relationship between the `I` and `Q` analog signals insures that both are not simultaneously null. An amplitude comparator determines which analog signal has the greater instantaneous amplitude. After noise filtering and correlation with a copy of a 13-bit Barker PN code used by the remote transmitter, the `stronger` signal is output as `received data.` The short PN code allows signal acquisition in less than one `byte,` resulting in rapid switching between transmit and receive modes.

REFERENCES:
patent: 4701934 (1987-10-01), Jasper
patent: 4785463 (1988-11-01), Janc et al.
patent: 4972430 (1990-11-01), Cantwell
patent: 5120997 (1992-06-01), Cantwell
patent: 5237586 (1993-08-01), Bottomley
patent: 5268927 (1993-12-01), Dimos et al.

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