Spread carrier self correcting codes

Details Spread carrier self correcting codes Spread carrier self correcting codes

2007-08-13

2011-11-15

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

08059695

ABSTRACT:
A transmitter, receiver and communication technique. The transmitter is adapted to interleave a first pseudo-noise sequence with a second pseudo-noise sequence to provide a third pseudo-noise sequence. The third sequence is transmitted and then received by the inventive receiver. The first and second sequences are chosen so that an XOR of the two sequences produces a third, known-valid pseudo-noise sequence. The receiver includes an arrangement for receiving and correlating the third pseudo-noise sequence to provide a measure of a frequency of the transmitted signal. The receiver further includes an arrangement for downconverting and filtering the received signal to provide a filtered complex signal. A complex multiplier is included for effecting a complex multiplication of the filtered complex signal with a delayed version of the filtered complex signal to provide a product. A correlator is included for correlating the product to provide the measure of frequency.

REFERENCES:
patent: 6959030 (2005-10-01), Clark
patent: 2003/0161383 (2003-08-01), Mower et al.
patent: 2004/0042535 (2004-03-01), Mayor et al.
patent: 2004/0180698 (2004-09-01), Kamemura et al.
D.L. Schilling, R.L. Pickholtz & L.B. Milstein, Spread Spectrum Goes Commercial, IEEE Spectrum, Aug. 1990.

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