| 5101417 |
Phase controlled synchronization for direct sequence spread-spectrum communication systems |
| Mar-31-1992 |
A receiver for a direct sequence spread-spectrum communication system of the type in which a transmitter mixes a clocked pseudo-random sequence with a modulated carrier for spreading the carrier energy... |
| 5099495 |
Spread spectrum communication device |
| Mar-24-1992 |
In a spread spectrum communication device using a convolver as a correlator, the modulation-demodulation system is so constructed that characteristics peculiar to the convolver are utilized for the frequency... |
| 5099494 |
Six channel digital demodulator |
| Mar-24-1992 |
A six channel programmable digital demodulator of the type designed to be manufactured as an integrated circuit with other components comprises a code channel, a level channel and a phase channel each... |
| 5099493 |
Multiple signal receiver for direct sequence, code division multiple access, spread spectrum signals |
| Mar-24-1992 |
Disclosed is a multiple-signal receiver system for direct sequence, code division multiple access (CDMA), spread spectrum (SS) signals. The receiver is structured to overcome inter-signal interference... |
| 5093841 |
Clock acquisition in a spread spectrum system |
| Mar-3-1992 |
A circuit and method is disclosed for recovering the transmitter clock at a receiver in a direct sequence spread spectrum communication system where a transmitter and receiver run independent clocks of... |
| 5093840 |
Adaptive power control for a spread spectrum transmitter |
| Mar-3-1992 |
An apparatus for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation. A base station transmits a... |
| 5090024 |
Spread spectrum communications system for networks |
| Feb-18-1992 |
Spread spectrum chirps (i.e., wideband frequency packets) are propagated on a local area network in a hostile communications environment, such as a powerline or a crowded radio frequency band. Chirps are... |
| 5084901 |
Sequential chirp modulation-type spread spectrum communication system |
| Jan-28-1992 |
A sequential chirp modulation-type spread spectrum communication system is disclosed relating to the FH-type which realizes fine transmission quality at low cost. It comprises at least primary and secondary... |
| 5081645 |
Novel spread spectrum codec apparatus and method |
| Jan-14-1992 |
A system comprising apparatuses and methods for encoding and decoding spread spectrum signals is disclosed. Signals are encoded by modulating numerical sequences selected from an orthonormal basis of numerical... |
| 5077753 |
Radio communication system using spread spectrum techniques |
| Dec-31-1991 |
A spread spectrum radio communication system includes a generator for generating a pseudo-random chipping sequence, a frequency spreader for combining digital data with the pseudo-random chipping sequence... |
| 5077754 |
Tau-dither circuit |
| Dec-31-1991 |
A tau-dither circuit in a spread spectrum communications system wherein a first PN code with a large phase change and a second PN code without a phase change are generated in the tau-dither circuit, and... |
| 5073899 |
Transmission system for sending two signals simultaneously on the same communications channel |
| Dec-17-1991 |
A transmission system in which a suitably modulated speech or data signal is combined with a low bit rate (100b/s) spread spectrum signal and transmitted simultaneously on the same channel with the modulated... |
| 5067136 |
Wireless alarm system |
| Nov-19-1991 |
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... |
| 5063571 |
Method and apparatus for increasing the data rate for a given symbol rate in a spread spectrum system |
| Nov-5-1991 |
A method and apparatus for transmitting a stream of data bits in a spread spectrum format is disclosed. The inventive method comprises providing 2.sup.N predetermined spreading sequences, where N is equal... |
| 5062122 |
Delay-locked loop circuit in spread spectrum receiver |
| Oct-29-1991 |
Spread spectrum receiver includes a delay locked loop (DLL) circuit for holding the synchronization of a despread signal with a received spread spectrum signal. The DLL circuit comprises a subtracter for... |
| 5062121 |
Spread spectrum communication device |
| Oct-29-1991 |
An SSC device according to the SSC method using a correlator is disclosed, in which a plurality of stages of shift register is connected in series, the outputs of the stages of the shift register being... |
| 5056108 |
Communication system |
| Oct-8-1991 |
In a spread spectrum communication system, sequence signals are developed in both a transmitter and receiver, in each case being derived from a clock signal through digital count-down and logic circuitry... |
| 5048053 |
Detecting and tracking circuit for component PN codes |
| Sep-10-1991 |
In a demodulator circuit for receiving a direct sequence spread spectrum signal having composite PN codes, there is provided a novel detecting and tracking circuit for faster acquisition of the component... |
| 5038363 |
Correlation processing device using a surface acoustic wave convolver |
| Aug-6-1991 |
A correlation processing device using a surface acoustic wave convolver, is disclosed, in which there are disposed gate sections in the in- and output stages of the convolver and these gates are controlled... |
| 5029184 |
Low probability of intercept communication system |
| Jul-2-1991 |
A low probability of intercept communication system (CCSK)--modulates information signals onto an inverse fast Fourier transformation of a large number of simultaneous frequencies that have been determined... |
| 5022047 |
Spread spectrum correlator |
| Jun-4-1991 |
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 a first... |
| 5022049 |
Multiple access code acquisition system |
| Jun-4-1991 |
Apparatus for generating a complex composite code for fast acquisition by multiple access users is provided which comprises a composite code generator having an in-phase channel code generator and a quadrature... |
| 5016257 |
Receiver for bandspread signals, particularly GPS receiver |
| May-14-1991 |
Receivers for bandspread signals have a carrier PLL (20) for the carrier frequency and phase and a code PLL (20, 30 . . . 34) for the code frequency and phase. To be able to receive even very noisy signals,... |
| 5008898 |
Carrier modulating device for a spread spectrum communication device |
| Apr-16-1991 |
In a carrier signal modulating device a carrier signal is modulated by using a square phase sequence as a PN code. |
| 5003552 |
Carrier aided code tracking loop |
| Mar-26-1991 |
A fast acquisition coherent code tracking loop for use in direct sequence spread spectrum systems is provided with an embedded frequency offset loop. The frequency offset loop in the code tracking loop... |
| 4972430 |
Spread spectrum signal detector |
| Nov-20-1990 |
A spread spectrum signal detector for sampling a modulated carrier employing a zero-crossing detection means having two independent control loops, a first loop for a zero-mean threshold control and a second... |
| 4962534 |
Frequency-diversity receiver system |
| Oct-9-1990 |
A frequency diversity receiver system operating over a predetermined bandwidth comprising a first mixer receiving two identical information signals widely separated in frequency, a stepping oscillator... |
| 4958359 |
Communication apparatus |
| Sep-18-1990 |
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... |
| 4956864 |
Receiver for communications satellite down-link reception |
| Sep-11-1990 |
A receiver utilizing a plurality of small paraboloid antennas in lieu of a single large antenna of equal area, each antenna connected to a separate phase coherent heterodyne receiver channel includes a... |
| 4941150 |
Spread spectrum communication system |
| Jul-10-1990 |
A spread spectrum communication system has, in a transmission part, a first circuit for extracting a first carrier signal from a predetermined broadcase wave and generating a first clock signal by using... |
| 4935940 |
Interference-proof reception of radio signals using frequency hopping techniques |
| Jun-19-1990 |
Two interference-proof techniques are shown for detecting binary radio sils transmitted by frequency hopping techniques. In the first, the decision as to which type of binary signal is being received is... |
| 4933954 |
Device for recombination of a message transmitted by a frequency hopping transmitter |
| Jun-12-1990 |
For recombining a message transmitted by a frequency hopping transmitter at a fast changing transmitting frequency, there are used a digital FFT search receiver for cyclically evaluating the frequency... |
| 4914699 |
High frequency anti-jam communication system terminal |
| Apr-3-1990 |
There is disclosed a high frequency communication system of the type employing a high frequency terminal which terminal can transmit a processed signal in a transmitting mode or process a received signal... |
| 4908859 |
Receiver access interface to service components in television channel |
| Mar-13-1990 |
A receiver interface system for enabling an operator to access different types of services in a like manner, wherein the services contain different combinations of service components received by a receiver... |
| 4891633 |
Digital image exchange system |
| Jan-2-1990 |
A digital image exchange system comprises a data transmission line, at least one video RAM, at least one video signal generator for accessing data from the video RAM and for developing at least two video... |
| 4890297 |
Burst jammer erasure circuit for spread spectrum receivers |
| Dec-26-1989 |
The present invention provides a novel burst erasing automatic gain control circuit which includes the basic elements of an automatic gain control circuit and further includes in the loop control circuit,... |
| 4882751 |
Secure trunked communications system |
| Nov-21-1989 |
A trunked communications system that accommodates encrypted secure communications. The system uses both non-encrypted message detectors and encrypted message detectors to assure that the trunked central... |
| 4872200 |
System of orthogonal code generators, radios provided with a code generator and code generators of such a system |
| Oct-3-1989 |
System of orthogonal code generators, where a first code generator (1) generates a code sequence from a running counter reading (2) which sequence is different from the code generated by a second code... |
| 4872182 |
Frequency management system for use in multistation H.F. communication network |
| Oct-3-1989 |
A frequency management scheme for a multistation H.F. communication network establishes communication channels among network stations over respective ones of K frequencies, so that network stations may... |
| 4862479 |
Spread spectrum communication system |
| Aug-29-1989 |
In a spread spectrum communication system, in which correlation output is obtained by giving a correlator a sender side output code and a receiver side output code, communication channels obtained by dividing... |
| 4847860 |
Phase-control system for telecommunications signals received by an adaptive antenna |
| Jul-11-1989 |
In a receiving station having an adaptive receiving antenna, a phasing system comprises a plurality of reception paths receiving telecommunications signals derived from the same useful signal combined... |
| 4843638 |
Receiver for frequency hopped signals |
| Jun-27-1989 |
A receiver for frequency hopped signal on which an information signal is modulated on one of a plurality of equally frequency spaced carrier signals. A mixer receives the frequency hopped signals on one... |
| 4843612 |
Method for jam-resistant communication transmission |
| Jun-27-1989 |
A method for jam-resistant transmission speech signals by radio which have been processed via vocoders, utilizing spread spectrum multiple access modulation (SSMA) or rapid frequency hopping (FH) provides,... |
| 4841545 |
Synchronous tracking device for direct spread spectrum receiver |
| Jun-20-1989 |
A synchronous tracking device for a receiver in a direct-spread spectrum communication system in which a carrier frequency and a pseudo noise code for spreading it are coherent. A first circuit tracks... |
| 4837823 |
Communication system |
| Jun-6-1989 |
A frequency hopping communication system whose transmitters and receivers after synchronization hop over a frequency series of a first type. To synchronize the transmitters and receivers, sync data from... |
| 4837786 |
Technique for mitigating rain fading in a satellite communications system using quadrature phase shift keying |
| Jun-6-1989 |
A system for data communication between ground stations using an orbiting satellite as a relay includes a technique for avoiding the loss of signals from the satellite during periods of heavy precipitation.... |
| 4829540 |
Secure communication system for multiple remote units |
| May-9-1989 |
A frequency-hopping datalink and providing communication between a base station, relay unit and multiple remote units utilizes time-division multiplexing and transmits information signals containing information... |
| 4811394 |
Variable starting state scrambling circuit |
| Mar-7-1989 |
PN sequence generators used in the scrambling and descrambling circuits at remote locations are periodically preset to the same value in order to maintain synchronism, with the preset value being also... |
| 4809295 |
Code lengthening system |
| Feb-28-1989 |
Apparatus and a method of generating very very long pseudonoise (PN) spread spectrum codes is provided where the code is so long that it need never repeat itself during actual use. The transmitter is adapted... |
| 4794643 |
Method for developing a key signal for descrambling in television broadcasting |
| Dec-27-1988 |
A scrambling method for TV pictures avoids deterioration of the reproduced picture by level compressing only selected horizontal flyback portions according to a randomly selected pattern to prevent synchronization... |
