| 6980657 |
Communications system using chaotic synchronized circuits |
| Dec-27-2005 |
A chaotic communication system employs transmitting and receiving chaotic oscillating circuits. In an embodiment of the invention employing a Chua circuit as the basic chaotic circuit, the transmitter... |
| 6882301 |
Time domain radio transmission system |
| Apr-19-2005 |
A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, in this... |
| 6792130 |
System and method for embedding a watermark signal that contains message data in a digital image |
| Sep-14-2004 |
A method for embedding a watermark signal that contains message data in a digital image sequence having two or more frames, includes the steps of: producing a set of two or more different carrier signals... |
| 6768903 |
Method of controlling a channel between a radio terminal and a cellular radiocommunication infrastructure, and access network implementing such a method |
| Jul-27-2004 |
Ciphered information is transmitted over a first communication path in circuit mode between a core network and a terminal, passing through a first master controller, then over a second path between the... |
| 6701363 |
Method, computer program product, and system for deriving web transaction performance metrics |
| Mar-2-2004 |
The present invention comprises a method of relating characteristics gleaned by monitoring application transaction flows (and the decomposition thereof) to produce performance metrics useful to characterize... |
| 6683955 |
Method for receiving a secured transmission of information through a plurality of frequency orthogonal subchannels |
| Jan-27-2004 |
One embodiment of the present invention is a method for receiving a secured transmission of information in an ADSL environment using a DMT modulation technique. The order of the frequency orthogonal subchannels... |
| 6674359 |
Method of identifying several transponders |
| Jan-6-2004 |
Transponders present in an interrogation zone can be identified by an interrogator by it sending an RF interrogation signal into the interrogation zone, the RF interrogation signal containing a code string... |
| 6580747 |
Method and generator for generating orthogonal spreading code in CDMA radio system |
| Jun-17-2003 |
The invention relates to a method and a generator for generating a short orthogonal spreading code in CDMA radio system. The method includes obtaining control data the length, the running number and the... |
| 6501841 |
Method for providing security for a transmission of information through a plurality of frequency orthogonal subchannels |
| Dec-31-2002 |
One embodiment of the present invention is a method for providing security for a transmission of information in an ADSL environment using a DMT modulation technique. The order of the frequency orthogonal... |
| 6484257 |
System and method for maintaining N number of simultaneous cryptographic sessions using a distributed computing environment |
| Nov-19-2002 |
An N session distributed architecture provides a software solution to the major computational challenges faced with providing secure communication. A registration entity is identified as the session arbitrator... |
| 6320965 |
Secure watermark method and apparatus for digital signals |
| Nov-20-2001 |
Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum with... |
| 6081601 |
Method of implementing connection security in a wireless network |
| Jun-27-2000 |
The invention relates to a method of providing connection security for a connection between terminals in a wireless network. In the method data is transmitted from a first terminal (MS1) via nodes in the... |
| 6061389 |
Frequency-hopping communication system and communication station |
| May-9-2000 |
A frequency hopping communication system having a plurality of wireless mobile stations and at least one base station. Each wireless mobile station is operated to communicate according to a communication... |
| 6014373 |
Spread spectrum CDMA subtractive interference canceler system |
| Jan-11-2000 |
A spread-spectrum code division multiple access interference canceler for reducing interference in a direct sequence CDMA receiver having N chip-code channels. The interference canceler includes a plurality... |
| 5952956 |
Time domain radio transmission system |
| Sep-14-1999 |
A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, in this... |
| 5930366 |
Synchronization to a base station and code acquisition within a spread spectrum communication system |
| Jul-27-1999 |
Each transmission frame within a spread spectrum communications system relating to synchronization code transmission is divided into a plurality of slots. Each of the slots includes a primary (pilot) code... |
| 5930291 |
Method and apparatus for selecting random values from a non-sequential set |
| Jul-27-1999 |
A method and apparatus for the selection of random values from a set of N non-sequential values includes software in ROM and RAM for information pool storage. Coupled to the ROM and RAM, a microprocessor... |
| 5926502 |
Phased array spread spectrum system and method |
| Jul-20-1999 |
A phased array spread spectrum system for maximizing signal strength of a spread-spectrum signal with multipath through the use of receiving means, delaying means, combining means, despreading means, generating... |
| 5923760 |
Chaotic communication apparatus and method for use with a wired or wireless transmission link |
| Jul-13-1999 |
A covert communication apparatus exploits chaotic dynamics in the multi-dimensional phase space with a continuous number of states and wide internal spectral bandwidth. The information modulates a chaotically... |
| 5848155 |
Spread spectrum watermark for embedded signalling |
| Dec-8-1998 |
A watermark is embedded into audio/video/image/multimedia data using spread spectrum methodology. The watermark is extracted from watermarked data without the use of an original or unwatermarked version... |
| 5841806 |
Method and apparatus for the transmission of energy-scaled variable rate data |
| Nov-24-1998 |
An apparatus for communicating variable rate data over a communication channel. A modulator that receive frames of user data each comprised of data symbols. The modulator repeats the data symbols within... |
| 5825887 |
Transmitting and receiving apparatus for full code correlation operation under encryption for satellite positioning system |
| Oct-20-1998 |
The transmitting and receiving apparatus and method for full code correlation operation under encryption for the Satellite Positioning System (SATPS) are disclosed. The apparatus includes a central station... |
| 5793798 |
Virtual beam system |
| Aug-11-1998 |
A virtual beam system operating in an environment, including a non-compatible receiver, includes a transmitting subsystem and a receiving subsystem. The transmitting subsystem includes an array of transmitting... |
| 5781582 |
Frequency agile transceiver with multiple frequency synthesizers per transceiver |
| Jul-14-1998 |
A base station communicates with a plurality of mobile stations over a cellular network. In one embodiment, the base station includes a receiver having a receiver synthesizer input, where the receiver... |
| 5771288 |
Multiple access coding for radio communications |
| Jun-23-1998 |
Individual information signals encoded with a common block error-correction code are assigned a unique scrambling mask, or signature sequence, taken from a set of scrambling masks having selected correlation... |
| 5754650 |
Simultaneous multichannel television access control system and method |
| May-19-1998 |
A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective... |
| 5742678 |
Multiple access coding for radio communications |
| Apr-21-1998 |
Individual information signals encoded with a common block error-correction code are assigned a unique scrambling mask, or signature sequence, taken from a set of scrambling masks having selected correlation... |
| 5719852 |
Spread spectrum CDMA subtractive interference canceler system |
| Feb-17-1998 |
A spread-spectrum code division multiple access interference canceler for reducing interference in a direct sequence CDMA receiver having N chip-code channels. The interference canceler includes a plurality... |
| 5715236 |
System and method for generating signal waveforms in a CDMA cellular telephone system |
| Feb-3-1998 |
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference... |
| 5712868 |
Dual mode communication network |
| Jan-27-1998 |
The dual mode communication network comprises a first communication system having a frame structure and a first traffic channel protocol and a second communication system having the frame structure and... |
| 5712626 |
Remotely-operated self-contained electronic lock security system assembly |
| Jan-27-1998 |
The present invention provides for a locking mechanism for use in a door and the like. A remote handheld controller transmits coded signals to an electronic door lock. A sensor/receiver receives the signals... |
| 5668880 |
Inter-vehicle personal data communications device |
| Sep-16-1997 |
A device for wireless, secure transmission of digital information signals utilizing carrier sense multiple access (CSMA) packet communications, or spread spectrum code division multiple access (CDMA) circuits,... |
| 5659587 |
Spread spectrum phase-locked loop clock generator with VCO driven by a symmetrical voltage ramp signal |
| Aug-19-1997 |
A phase-locked loop circuit comprises a VCO and a ramp generator. The ramp generator has an output connected to a control terminal of the VCO. A center frequency control loop is connected between a signal... |
| 5659569 |
Data burst randomizer |
| Aug-19-1997 |
A method and system, for use in a communication system in which data is transmitted in data frames of a predetermined time duration, for the positioning of the data within the data frames for transmission.... |
| 5640414 |
Mobile station assisted soft handoff in a CDMA cellular communications system |
| Jun-17-1997 |
In a code division multiple access (CDMA) spread spectrum cellular communication system in which a mobile station user communicates with another system user via at least one base station, wherein each... |
| 5640415 |
Bit error performance of a frequency hopping, radio communication system |
| Jun-17-1997 |
The technique of redundantly retransmitting digitized voice data on multiple sequential frequencies increases the channel bit rate above the minimum required for normal communication in a frequency-hopping... |
| 5638399 |
Multi-beam satellite communication system with user terminal frequencies having transceivers using the same set of frequency hopping |
| Jun-10-1997 |
The satellite radio communication system of this invention provides communication between one or more service centers and an ensemble of fixed and mobile user terminals. One or more earth orbiting satellites... |
| 5633889 |
Phased array spread spectrum system and method |
| May-27-1997 |
A phased array spread spectrum system for maximizing signal strength of a spread-spectrum signal with multipath through the use of receiving means, delaying means, combining means, despreading means, generating... |
| 5629955 |
Variable spectral response FIr filter and filtering method |
| May-13-1997 |
A method and system, for use in a communication system in which data is transmitted in data frames of predetermined time duration, for the positioning of the data within the data frames for transmission.... |
| 5606322 |
Divergent code generator and method |
| Feb-25-1997 |
A method and corresponding apparatus (10) for generating a pseudo-random number. The method has steps of generating a first bit stream from a number generator (16, 35), combining a predetermined number... |
| 5598471 |
Method and apparatus for encoding and decoding of audio transmission signals |
| Jan-28-1997 |
A system for encoding and decoding an audio transmission signal comprises: (a) an encoder with a frequency-varying means to vary the carrier frequency of the audio signal according to an encryption algorithm;... |
| 5598427 |
Wireless alarm system |
| Jan-28-1997 |
A wireless alarm system using spread spectrum transmitters, fast frequency shift keying, spread spectrum receivers and computer with a display. The spread spectrum transmitter includes an oscillator coupled... |
| 5594718 |
Method and apparatus for providing mobile unit assisted hard handoff from a CDMA communication system to an alternative access communication system |
| Jan-14-1997 |
A method and system for providing a reliable means to perform handoff from a code division multiple access (CDMA) system using a pilot signal to an alternative access communication technique system. Simple... |
| 5586141 |
Interface protocol method for use in a frequency hopping radio system having first hopping code for synchronization and second hopping code for communication |
| Dec-17-1996 |
A method of communicating between two or more radios each capable of transmitting and receiving signals between one another on two or more radio channels wherein the radios hop from channel to channel... |
| 5574747 |
Spread spectrum adaptive power control system and method |
| Nov-12-1996 |
A system and method for adaptive power control of a spread spectrum transmitter of a mobile unit operating in a cellular-communications network having a plurality of mobile units in communication with... |
| 5574721 |
Orthogonal code tracking system having phantom carrier signal |
| Nov-12-1996 |
An OCDMA communication system in which channel signals are bandwidth spread according to a PN code and each channel is identified by a selected one of a set of RW code accesses. The set of RW codes is... |
| 5559828 |
Transmitted reference spread spectrum communication using a single carrier with two mutually orthogonal modulated basis vectors |
| Sep-24-1996 |
The disclosed spread spectrum system has the reference transmitted on one phase (basis vector) of a .pi./2-offset QPSK signal, and the spread data signal transmitted on another phase (basis vector). The... |
| 5555268 |
Multicode direct sequence spread spectrum |
| Sep-10-1996 |
In this patent, we present MultiCode Direct Sequence Spread Spectrum (MC-DSSS) which is a modulation scheme that assigns up to N DSSS codes to an individual user where N is the number of chips per DSSS... |
| 5553094 |
Radio communication network for remote data generating stations |
| Sep-3-1996 |
A wide area communications network communicating data from a plurality of network service modules through a plurality of remote cell nodes and intermediate data terminals to a central data terminal. The... |
| 5553062 |
Spread spectrum CDMA interference canceler system and method |
| Sep-3-1996 |
A spread-spectrum code division multiple access interference canceler system and method for reducing interference in a spread-spectrum CDMA receiver having N chip-code channels, with each of the N channels... |
