Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2011-03-22
2011-03-22
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S148000, C375S150000, C375S152000
Reexamination Certificate
active
07912114
ABSTRACT:
A direct-sequence spread-spectrum communications method of de-spreading and decoding received data transmitted through an acoustic channel. A first code match filter is applied to receive data to output a first code impulse response comprising a channel impulse response modulated by a pseudo-random number bit. A second code match filter is applied to the received data to output a second code impulse response comprising the channel impulse response modulated by a message symbol bit. The first code impulse response is correlated with the second code impulse response to output the message symbol bit modulated by the pseudo-random number bit. The pseudo-random number bit is eliminated to identify the message symbol bit, thereby decoding the message symbol bit from the received data.
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Bocure Tesfaldet
Koshy Suresh
Ressing Amy L.
The United States of America as represented by the Secretary of
Williams Lawrence B
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