Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2008-03-26
2011-10-18
Lam, Kenneth (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S130000, C375S147000, C375S140000
Reexamination Certificate
active
08040937
ABSTRACT:
A method is provided for improving a signal-to-noise ratio in a received signal. The method involves receiving a spread spectrum signal (SSS) with a power level below a noise floor of a receiver. The SSS is generated by modulating a data signal using a spreading sequence (SS) comprised of a random number sequence (RNS). The SS can be generated using a chaos generator or any other deterministic means. The method also involves comparing a magnitude of each number of the RNS which was used to generate the SSS to an adaptable threshold value. The adaptable threshold value is selected based on a minimum magnitude of each number necessary to produce samples having a predetermined signal-to-noise ratio. Notably, samples of the received SSS are excluded from a receiver processing based on a result of the comparison. Similarly, each number of a random number sequence is excluded from the receiver processing based on the comparison.
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Fox Rothschild LLP
Harris Corporation
Lam Kenneth
Sacco Robert J.
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