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Class Information
Number: 380/31
Name: Cryptography > Communication system using cryptography > Wireless communication > Plural modulation of single carrier
Description: Subject matter which modulates a carrier with more than one signal or varies more than one signal parameter.

Sub-classes under this class:

Class Number Class Name Patents
380/32 Wobbling of carrier 12

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8532293 Method and system for securely providing and storing content in a multiple dwelling unit system Sep. 10, 2013
8526604 Enabling wireless clients for low-power operation when clients require control messages from external sources for communication Sep. 3, 2013
8406425 Method and apparatus for minimizing co-channel interference Mar. 26, 2013
8374350 Quantum communication system Feb. 12, 2013
8312551 Low level sequence as an anti-tamper Mechanism Nov. 13, 2012
8280054 Scrambling and descrambling systems for secure communication Oct. 2, 2012
8184972 Method and apparatus relating to secure communication May. 22, 2012
8139682 Channel estimation of orthogonal frequency division multiplexed systems Mar. 20, 2012
8099369 Method and system for securing content in media systems Jan. 17, 2012
8000475 System and method for encrypting and modulating video streams Aug. 16, 2011
7920713 Recorded video broadcast, streaming, download, and disk distribution with watermarking instructions Apr. 5, 2011
7907670 Data transmitting apparatus and data receiving apparatus Mar. 15, 2011
7864959 Methods and apparatus for multi-level dynamic security system Jan. 4, 2011
RE42002 Apparatus and method for high speed data communication Dec. 14, 2010
7783578 System for providing cardless payment Aug. 24, 2010
7760792 Spread spectrum electromagnetic signals Jul. 20, 2010
7680278 Domino scheme for wireless cryptographic communication and communication method incorporating same Mar. 16, 2010
7512237 Encryption for optical communications using dynamic subcarrier multiplexing Mar. 31, 2009
7421075 Wireless online cryptographic key generation method Sep. 2, 2008
7415043 Code division multiple access (CDMA) method and apparatus for protecting and authenticating wirelessly transmitted digital information Aug. 19, 2008
7356141 Baud rate modulation encoding/decoding method and device for remote controller Apr. 8, 2008
7333614 System and method for encypting spread spectrum carrier Feb. 19, 2008
7308104 Forward multiple scrambling code generating method and apparatus Dec. 11, 2007
7228131 IPv6/IPv4 tunneling method Jun. 5, 2007
6980657 Communications system using chaotic synchronized circuits Dec. 27, 2005
6683958 Apparatus and method for embedding and extracting information in analog signals using distributed signal features and replica modulation Jan. 27, 2004
6427012 Apparatus and method for embedding and extracting information in analog signals using replica modulation Jul. 30, 2002
6389138 Method and apparatus for generating a complex scrambling code sequence May. 14, 2002
6363325 Automotive emergency awareness system Mar. 26, 2002
6249583 On-line signal processing method Jun. 19, 2001
6229897 Apparatus and method of secured analog voice communication May. 8, 2001
5864625 Methods and apparatus for secure optical communications links Jan. 26, 1999
5790591 Spread spectrum transmitter and communications system using multiple spreading codes Aug. 4, 1998
5642397 Paging system which combines a paging signal with a standard broadcast baseband signal Jun. 24, 1997
5471531 Method and apparatus for low cost audio scrambling and descrambling Nov. 28, 1995
5379345 Method and apparatus for the processing of encoded data in conjunction with an audio broadcast Jan. 3, 1995
5305384 Apparatus, system and method for transmitting secure signals over narrow spaced channels Apr. 19, 1994
5268926 Method and apparatus for the simultaneous transmission of separate data signals Dec. 7, 1993
5258996 Spread spectrum apparatus Nov. 2, 1993
5228055 Spread spectrum communication device Jul. 13, 1993
4972479 Method and apparatus for providing privacy/security in a communication system Nov. 20, 1990
4908860 System for the secret transmission of audio signals and television receiver for receiving such signals Mar. 13, 1990
4841571 Privacy signal transmission system Jun. 20, 1989
4799257 Wireless transmission system for PM modulation signal Jan. 17, 1989
4658436 Disguised transmission system and method Apr. 14, 1987
4652699 Voice scrambler using frequency-inversion and band-splitting technique Mar. 24, 1987
4653069 Spread spectrum correlation receiver Mar. 24, 1987
4652838 Phase randomization to reduce detectability of phase or frequency-modulated digital signals Mar. 24, 1987
4538281 Adaptive acquisition of multiple access codes Aug. 27, 1985
4516078 Variable frequency passband circuit May. 7, 1985

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