Pulse or digital communications – Repeaters – Testing
Patent
1981-04-13
1983-06-07
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
307356, 307352, 328149, 375 76, H03K 1730, H04B 1500
Patent
active
043874657
ABSTRACT:
An improved sequential threshold detection circuit for use in the receiver of a spread-spectrum communication system is disclosed wherein the improvement resides in the employment of a feedback circuit for maintaining a pre-selected constant median dismissal time. In the preferred embodiment the feedback circuit comprises a flip-flop (70), a very long time constant integrator (72), and a one-shot (74) connected between a comparator (64) and a summing amplifier (60) for varying a threshold bias voltage applied to the summing amplifier. In an alternative embodiment, the feedback circuit serves to selectively vary the gain of a variable gain amplifier (110) in such a manner to vary the individual trial and error dismissal times to provide a substantially constant median dismissal time over the entire detection process.
The detection circuit of the invention provides a signal indicating whether the pseudo-random noise generator (26) in the system receiver (9) has been synchronized to the pseudo-random noise generator (16) in the system transmitter (8), but does so with improved reliability, accuracy and statistical performance with reduced manufacturing cost.
REFERENCES:
patent: 3896395 (1975-07-01), Cox
patent: 4122393 (1978-10-01), Gordy et al.
patent: 4161628 (1979-07-01), McRae
Keller Robert W.
Nyhagen Donald R.
Safourek Benedict V.
TRW Inc.
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