Maryland's Defense Patent Database

The defense community in Maryland is an R&D powerhouse.

Use this database to see the innovative patents that are poised for commercialization.

Means for low probability of interception/detection underwater acoustic communications

Patent image
NRL

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.

Inventors: 
Yang, Tsih C.
Patent Number: 
Technical domain: 
Communications
FIle Date: 
2008-03-19
Grant Date: 
2011-03-22
Grant time: 
1,098 days
Grant time percentile rank: 
20
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY