Dual-threshold spread spectrum correlator

Details Dual-threshold spread spectrum correlator Dual-threshold spread spectrum correlator

1996-03-11

1998-02-17

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

H04B 1707

Patent

active

057199000

ABSTRACT:
An apparatus for decoding a received spread spectrum signal having a data signal modulated with a pseudo-noise code and transmitted as an RF spread spectrum signal. A first reference register holds a first pseudo-noise signal, a second reference register holds a second pseudo-noise signal, and a receive-register holds a received spread spectrum signal. A first modulo adder adds each chip of the received spread spectrum signal with each respective chip of the first pseudo-noise signal, thereby generating a first plurality of chip-comparison signals. A first summer adds the first plurality of chip-comparison signals, generating a first correlation signal. The comparator compares the correlation signal to an upper threshold level and a lower-threshold level, and respectively generates a first data-symbol signal or a second data-symbol signal.

REFERENCES:
patent: 4908837 (1990-03-01), Mori et al.
patent: 5016255 (1991-05-01), Dixon et al.
patent: 5022047 (1991-06-01), Dixon et al.
patent: 5132986 (1992-07-01), Endo et al.
patent: 5396515 (1995-03-01), Dixon et al.
Robert C. Dixon, Spread Spectrum Systems, New York: John Wiley & Sons, 1984, pp. 18 and 153-213, 1984.

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