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5887243 |
Signal processing apparatus and methods
A unified system of programing communication. The system encompasses the prior art (television, radio, broadcast hardcopy, computer communications, etc.) and new user specific mass media. Within...
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5887020 |
Multi-band, multi-mode spread-spectrum communication system
A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and...
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5881100 |
Method and apparatus for coherent correlation of a spread spectrum signal
A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams...
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5864762 |
Operating a trunked communication system in transmission and message trunked modes
A digitally trunked radio repeater system provides substantial improvements in timeliness and reliability. The mobile radio transceivers transmit channel requests on the control channel at 9600...
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5859842 |
Antenna diversity techniques
A receiver system for antenna diversity employing a single backhaul cable. A single backhaul cable couples a receiver to a plurality of antennas. The signals from the antennas are combined onto the...
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5856998 |
Method and apparatus for correlating a continuous phase modulated spread spectrum signal
A technique for modulating and demodulating continuous phase modulation (CPM) spread spectrum signals and variations thereof. A transmitter encodes M data bits using a selected spread spectrum...
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5850600 |
Three cell wireless communication system
A wireless communication system including a repeated pattern of cells, in which base station transmitters and user station transmitters for each cell may be assigned a spread-spectrum code for...
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5832028 |
Method and apparatus for coherent serial correlation of a spread spectrum signal
A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams...
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5818820 |
Method and system for data link expansion or contraction using spread spectrum TDMA communication
A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a micro cell or other type of cellular communication system. A method in which user...
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5815525 |
Multi-band, multi-mode spread-spectrum communication system
A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and...
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5805704 |
Method and apparatus for protecting broadcast software against unauthorized reception on a software broadcasting system
Disclosed is a method and apparatus provided on a game software broadcasting system for protecting the broadcast game software against unauthorized reception after the prescribed period of...
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5799082 |
Secure authentication of images
Apparatus for capturing and authenticating a visual image of a selected view, using a digital image forming means, such as a digital camera, together with a position determining system that...
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5796772 |
Multi-band, multi-mode spread-spectrum communication system
A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and...
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5790591 |
Spread spectrum transmitter and communications system using multiple spreading codes
A spread spectrum transmitter for generating a plurality of spread spectrum codes comprises a shift register having a plurality of stages, with a plurality of tap sets connected to selected ones of...
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5790587 |
Multi-band, multi-mode spread-spectrum communication system
A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and...
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5787076 |
Multi-mode TDMA spread spectrum communication system
A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user...
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5768391 |
System and method for ensuring user privacy in network communications
A system and method for ensuring user privacy in a messaging system where a message is sent from a sender to a recipient via a service provider. Information pertaining to the identification of a...
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5768264 |
Time division multiple access base station supporting ISDN messages
A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user...
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5764770 |
Image authentication patterning
Apparatus for producing a self-authenticating visual image of a selected view, using a digital image forming means, such as a digital camera, together with a position determining system that...
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5761239 |
Method and apparatus for despreading spread spectrum signals
A system for despreading and/or demodulating spread spectrum codes is provided. A data signal is encoded using an M-ary transmission technique, wherein predefined symbol codes are associated with a...
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5757847 |
Method and apparatus for decoding a phase encoded signal
An apparatus and method for receiving spread spectrum signals, and, further, for decoding phase encoded information from such signals, requires correlation of input signals into real and imaginary...
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5754657 |
Authentication of a message source
Methods for authentication or validation of the location of a putative source (ps) of a message, using time varying location determination (LD) signals that are received from J sources (J>1) of...
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5754585 |
Method and apparatus for serial noncoherent correlation of a spread spectrum signal
A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams...
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5754584 |
Non-coherent spread-spectrum continuous-phase modulation communication system
A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A spread spectrum transmitter includes a chip sequence generator for...
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5742638 |
Spread-spectrum data publishing system
A system for publishing data on shared broadcast channels using spread-spectrum techniques, which may comprise a spread-spectrum encoder capable of receiving data and placing it in a...
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5724383 |
Method for generating and encoding signals for spread spectrum communication
A method for communicating using a plurality of spread spectrum codes. A plurality of spreading codes are generated by use of one or more linear feedback shift registers configured with feedback...
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5694414 |
Multi-band, multi-mode spread-spectrum communication system
A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and...
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5692007 |
Method and apparatus for differential phase encoding and decoding in spread-spectrum communication systems with continuous-phase modulation
A method and apparatus for phase encoding and decoding a CPM spread spectrum signal. A transmitter divides a data stream into a data symbol portion and an associated phase information portion. The...
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5680414 |
Synchronization apparatus and method for spread spectrum receiver
An apparatus and method for synchronizing a spread spectrum receiver comprises a preamble matched filter and a plurality of symbol code correlators for receiving and correlating to a received...
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5671219 |
Communication protocol for spread spectrum communication
A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user...
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5659574 |
Multi-bit correlation of continuous phase modulated signals
A technique for demodulating CPM spread spectrum signals and variations thereof. A receiver receives a CPM spread spectrum signal, splits it into two signals, demodulates the signals (either...
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5648982 |
Spread spectrum transmitter
A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams...
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5648955 |
Method for power control in a TDMA spread spectrum communication system
A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user...
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5640674 |
Three-cell wireless communication system
A wireless communication system including a repeated pattern of cells, in which base station transmitters and user station transmitters for each cell may be assigned a spread-spectrum code for...
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5629956 |
Method and apparatus for reception and noncoherent serial correlation of a continuous phase modulated signal
A technique for modulating and demodulating continuous phase modulation (CPM) spread spectrum signals and variations thereof. A transmitter encodes M data bits using a selected spread spectrum...
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5627856 |
Method and apparatus for receiving and despreading a continuous phase-modulated spread spectrum signal using self-synchronizing correlators
Apparatus and method for despreading a received continuous phase modulated spread spectrum signal includes a power divider for dividing a received spread spectrum signal into a real signal and an...
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5610940 |
Method and apparatus for noncoherent reception and correlation of a continous phase modulated signal
A technique for modulating and demodulating continuous phase modulation (CPM) spread spectrum signals and variations thereof. A transmitter encodes M data bits using a selected spread spectrum...
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5574788 |
Trunked radio repeater system
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses...
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5499265 |
Spread spectrum correlator
An apparatus for decoding a received spread spectrum signal having a data signal modulated with a pseudo-noise code and transmitted as an RF spread spectrum signal. A first reference register holds...
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5497424 |
Spread spectrum wireless telephone system
A system for accessing a telephone system, in which a set of user stations are matched with a set of base stations for connection to a telephone network. Each base station may be coupled directly...
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5455822 |
Method and apparatus for establishing spread spectrum communication
A method for establishing communications between a master unit and a plurality of node units. Of the plurality of node units, K node units are assumed to have established communications with a...
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5432850 |
Method and apparatus for secure data transmission
A method for secure transmission of data having a destination address and a source address on a shared communication network comprising the steps of transmitting a multiplicity of data frames, each...
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5410568 |
CDMA/TDMA spread-spectrum communications system and method
A spread-spectrum transmitter and receiver using code division multiple access with time division multiple access technology for spread-spectrum communications. At a base station, a spread-spectrum...
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5408680 |
Single channel autonomous digitally trunked RF communications system
A single channel autonomous trunking ("SCAT") RF repeater transmits and receives on a single duplex RF channel. The repeater operates alternately in a control channel mode and in an assigned...
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5402413 |
Three-cell wireless communication system
A wireless communication system including a repeated pattern of cells, in which base station transmitters and user station transmitters for each cell may be assigned a spread-spectrum code for...
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5392353 |
Interactive satellite broadcast network
Encrypted communications ensure privacy of communications point-to-point in a network of interactive video stations interconnected by a broadcast network. The encryption as a function of personal...
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5369783 |
Dynamic regrouping in a trunked radio communications systems
In a trunked radio frequency communications system, a dynamic regrouping scheme includes an effective user interface, automatic support of multi-site systems, the capability to program individual...
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5355389 |
Reciprocal mode saw correlator method and apparatus
A surface-acoustic-wave correlator for decoding a spread-spectrum signal having a data signal modulated with a plurality of chip sequences and reciprocal-chip sequences. A tapped-delay-line has a...
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5351269 |
Overlaying spread spectrum CDMA personal communications system
A spread spectrum CDMA communications system for communicating data and/or digitized voice between a plurality of users to a plurality of PCN units. The spread spectrum communications system is...
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5345467 |
CDMA cellular hand-off apparatus and method
An apparatus for controlling hand-off in a spread-spectrum-CDMA-communications system, for radio devices moving from one cell to another, with each cell having a base station transmitting spread...
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