| 5206882 |
System for and method of creating and assigning address codes in a cellular spread spectrum system |
| Apr-27-1993 |
A system and method for developing and assigning address codes in a radiotelephone communication system using spread spectrum modulation techniques based upon an analysis of signal strength and without... |
| 5204875 |
4-ary correlator, matched filter, and decoder for coherent, direct sequence, spread spectrum applications |
| Apr-20-1993 |
A system for decoding an IF signal modulated with 4-ary words generated at a known spreading rate (PN code) comprises a receiver in which four known 4-ary words are generated at the same rate. The system... |
| 5199044 |
System for detecting position of object having data carrier |
| Mar-30-1993 |
A plurality of data carriers are prepared and possessed by, for example, persons who enter a building. The data carrier spread spectrum modulates a carrier signal of a predetermined frequency by an assigned... |
| 5199045 |
Communication apparatus |
| Mar-30-1993 |
A spread communication system comprising a receiver, a diffusion convertor for converting a signal from the receiver, a control signal generator for generating a control signal representing an output level... |
| 5195105 |
Spread spectrum receiver |
| Mar-16-1993 |
A spread spectrum receiver is disclosed, in which influences of narrow band disturbing waves are reduced by converting the output of a correlator into base band information and removing frequency components... |
| 5193102 |
Method and apparatus for improving detection of data bits in a slow frequency hopping communication system |
| Mar-9-1993 |
A method and apparatus is provided for improving detection of data bits in data samples (120) of a hop of a slow frequency hopping spread spectrum signal (112). In the detecting process, the carrier to... |
| 5191593 |
Conference call feature for spread spectrum cordless telephone |
| Mar-2-1993 |
A conference call feature is offered for use with spread spectrum cordless communication systems. The conference call feature is achieved through the alternate use of redundant communication resources... |
| 5187718 |
Demodulator for spread spectrum communication |
| Feb-16-1993 |
A demodulator for a spread spectrum communication system, including a piezoelectric substrate for causing elastic surface waves, an input electrode provided on the surface of the piezoelectric substrate,... |
| 5185762 |
Spread spectrum microwave overlay with notch filter |
| Feb-9-1993 |
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 located... |
| 5181246 |
Privacy communication device |
| Jan-19-1993 |
A privacy communication device uses a control channel (5) in addition to a voice channel (4) in communicating with other privacy communication device. Each privacy communication device employs a ring modulator... |
| 5181226 |
Threshold level generator |
| Jan-19-1993 |
A threshold level generator for generating threshold levels to detect zero-crossings of a spread spectrum received waveform. An IF sampler quantizes the received spread spectrum signals at IF. The IF signal... |
| 5179574 |
Spread PN code signal receiver |
| Jan-12-1993 |
A spread PN code signal receiver having a delay locked loop (DLL) circuit in an IF or RF stage characterized in that correlation outputs to be used for the DLL circuit control are (1) a correlation output... |
| 5179569 |
Spread spectrum radio communication system |
| Jan-12-1993 |
A data entry and retrieval system utilizing a plurality of remote units in radio communication with a plurality of base units in electronic communication with a central processing computer. The base units... |
| 5179570 |
Direct sequence spread spectrum communication system with self-synchronizing correlator and method |
| Jan-12-1993 |
Spread spectrum communication system comprising a transmitter for transmitting data in bit form from one location to a remote location. An encoder is provided for encoding the data with a chip sequence... |
| 5177765 |
Direct-sequence spread-spectrum digital signal acquisition and tracking system and method therefor |
| Jan-5-1993 |
A system and method of driect-sequence spread-spectrum TDMA (or TDD) digital communication, wherein acquisition and tracking occurs for a plurality of frames having a predetermined number of time slots.... |
| 5177766 |
Digital clock timing generation in a spread-spectrum digital communication system |
| Jan-5-1993 |
A unique method and system is disclosed for generating digital clock timing in a receiver for use in direct-sequence spread-spectrum digital communication systems wherein spread data is delivered from... |
| 5170410 |
Direct sequence spread spectrum digital communication system employing sequence changing during transmission and transmitter and receiver implementing same |
| Dec-8-1992 |
A digital signal receiver comprises receiver and demodulator means producing from the received signal a succession of complex elements. It produces sequences of successive complex elements consisting of... |
| 5168506 |
Method for protected radio signal transmission |
| Dec-1-1992 |
In radio operation in tactical use, an increased jamming resistance with respect to intentional jamming is required. For protection against intentional jamming, frequency hopping techniques have proven... |
| 5166952 |
Method and apparatus for the reception and demodulation of spread spectrum radio signals |
| Nov-24-1992 |
A spread spectrum receiver with filters matched to transmitter chip codes are implemented in digital circuits along with a digital circuit for acquisition and tracking of the arrival times of the chip... |
| 5161168 |
Spread spectrum CDMA communications system microwave overlay |
| Nov-3-1992 |
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 located... |
| 5159607 |
RF signal synthesis |
| Oct-27-1992 |
Apparatus for synthesizing complex composite RF signals comprising a source of unmodulated RF carrier signal, means for splitting the RF carrier signal output of the source into equal components, separate... |
| 5157686 |
Method and apparatus for the modulation of spread spectrum radio signals |
| Oct-20-1992 |
A spread spectrum receiver with filters matched to transmitter chip codes are implemented in digital circuits along with a digital circuit for acquisition and tracking of the arrival times of the chip... |
| 5155741 |
High data rate long pulse compression waveform communication system for M-ary encoding voice messages for air traffic control systems |
| Oct-13-1992 |
A communications system which decreases noise errors and increases informon rate without sacrificing bandwidth is formed by a transmitter and a receiver designed to handle long pulse compression wavforms.... |
| 5150401 |
Retrofittable encryption/decryption apparatus using modified frequency modulation |
| Sep-22-1992 |
A communication system for providing secured communication over a communication channel. The system includes a DES encryption device and a DES decryption device retrofittable into or within a conventional... |
| 5146471 |
Correlator for spread spectrum communications systems |
| Sep-8-1992 |
An improved correlator for use in a spread spectrum communications system which operates with a predetermined chip sequence includes an N-stage correlation register, wherein each stage corresponds to a... |
| 5144640 |
Correlation device for spectrum spread communication |
| Sep-1-1992 |
A correlation device for spectrum spread communication capable of being simplified in construction and carrying out high speed synchronism. The correlation device includes a code inversion device in place... |
| 5136645 |
Bandwidth controller for phase-locked-loop |
| Aug-4-1992 |
A phase locked loop utilizing digital techniques to control the closed loop bandwidth of the RF carrier phase locked loop in a receiver provides high sensitivity and a wide dynamic range for signal reception.... |
| 5136611 |
Orthogonal sequence generator and radar system incorporating the generator |
| Aug-4-1992 |
An apparatus, usable in a radar system, for generating a multi-value orthogonal sequence includes a multi-element M-sequence generator and a component substituting device. The M-sequence generator comprises... |
| 5136614 |
Spread spectrum communication system |
| Aug-4-1992 |
A spread spectrum communictdion system includes a transmitter and a receiver, and an on-off keying signal is inputted to the transmitter. A carrier signal is modulated by the on-off keying signal, and... |
| 5136612 |
Method and apparatus for reducing effects of multiple access interference in a radio receiver in a code division multiple access communication system |
| Aug-4-1992 |
A CDMA system embodying apparatus and methods operates to reduce the effects of the multiple access interference in order to increase the channel capacity and achieve greater efficiency in the use of a... |
| 5134631 |
Digital gain controller |
| Jul-28-1992 |
A novel programmable digital gain controller is provided for the automatic gain control loop of a communications receiver. The digital gain controller comprises a pair of digital detectors coupled to the... |
| 5132985 |
Spread spectrum receiver |
| Jul-21-1992 |
A spread spectrum receiver has first and second correlators which each compare a received signal with a respective reference signal. The output of each correlator is routed through a respective band pass... |
| 5131006 |
Carrier detection for a wireless local area network |
| Jul-14-1992 |
A local area network (10) utilizes a wireless transmission link and has network stations (12) each having two differently polarized antennas (14, 16). Data transmission utilizes a spread spectrum code... |
| 5128959 |
Variable bandwidth CDMA radio system |
| Jul-7-1992 |
A method of identifying a proximal base site of a number of base sites by a communication unit in a CDMA communication system having a number of communication resources. The communication unit identifies... |
| 5128960 |
Clock recovery for a wireless local area network station |
| Jul-7-1992 |
A local area network station for receiving data symbols encoded in a spread spectrum code and transmitted over a wireless channel includes in-phase and quadrature correlators (42, 44) the output signals... |
| 5127021 |
Spread spectrum television transmission |
| Jun-30-1992 |
A spread spectrum transmission system for transmitting a television signal, the transmission system including a module for dividing the television signal into a plurality of frequency components; a module... |
| 5127020 |
Bias control device |
| Jun-30-1992 |
A bias control device for a narrow band interference suppressing filter using a surface acoustic wave (SAW) element is disclosed, in which bias shift signals corresponding to spectre intensities of channels... |
| 5121407 |
Spread spectrum communications system |
| Jun-9-1992 |
A spread spectrum communication system for direct sequence transmission of digital information having a modulation format which is particularly suitable for indoor communication within residential, office... |
| 5119104 |
Location system adapted for use in multipath environments |
| Jun-2-1992 |
A radiolocation system for multipath environments, such as for tracking objects in a semiconductor fabrication facility (FIGS. 1a-1b), includes an array of receivers (20) distributed within the tracking... |
| 5115448 |
Spread spectrum receiver |
| May-19-1992 |
A spread spectrum receiver using a correlator is disclosed, in which first and second comparing means comparing a correlation spike coming from the correlator with a first and a second reference voltage... |
| 5113443 |
Method for scrambling satellite communications |
| May-12-1992 |
A secure communications system multiplexes segments of the information signal for keyed encoding and modulation onto a plurality of different carrier frequencies and/or polarizations, and transmits the... |
| 5113409 |
Spread spectrum intercept apparatus and method |
| May-12-1992 |
An apparatus for detecting an intercept signal having spread spectrum modulation, having a first antenna, a second antenna, a first channelizer, a second channelizer, parametric encoders, a spread hopper... |
| 5111478 |
Method and apparatus for providing signal synchronization in a spread spectrum communication system |
| May-5-1992 |
A method and apparatus is provided for synchronizing a spread spectrum communication site. The communication site receives a spread message signal from over a radio communication channel. Subsequently,... |
| 5111479 |
Spread spectrum receiver and carrier sense circuit therefor |
| May-5-1992 |
A carrier sense circuit for sensing a carrier component of a received signal in a spread spectrum system includes a multiplier which produces a squared signal by multiplying the received signal by itself,... |
| 5105437 |
Programmable digital acquisition and tracking controller |
| Apr-14-1992 |
A novel programmable digital acquisition and tracking controller is coupled to the input signal level from the demodulator of a communications receiver and provides programmable signal level threshold... |
| 5105436 |
Spread spectrum receiver |
| Apr-14-1992 |
A spread spectrum receiver using a correlator includes a pattern matching circuit for deciding presence or absence of a pulse output which is obtained upon coincidence between the pattern of a correlator... |
| 5105435 |
Method and apparatus for cancelling spread-spectrum noise |
| Apr-14-1992 |
A spread-spectrum noise canceller is provided for cancelling user code noise from a spread-spectrum communication channel. The spread-spectrum noise canceller including a receiver for receiving a spread-spectrum... |
| 5103459 |
System and method for generating signal waveforms in a CDMA cellular telephone system |
| Apr-7-1992 |
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... |
| 5103461 |
Signal quality measure in packet data communication |
| Apr-7-1992 |
A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central compuer which maintains a database management system. Data packets... |
| 5103460 |
Spread spectrum intercept apparatus and method |
| Apr-7-1992 |
An apparatus for detecting an intercept signal having spread spectrum modulation, having a first antenna, a second antenna, a first channelizer, a second channelizer, parametric encoders, a spread hopper... |
