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5319672 |
Spread spectrum communication system
A spread spectrum communication system has a plurality of transmit ends capable of simultaneous communications and at least one receive end. Each of the transmit ends modulates digital information...
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5313490 |
Acquisition apparatus for DSSS communications
Apparatus for indicating the end of an acquisition procedure between a transmitter and receiver in a direct sequence spread spectrum communications system. A transmitter generates a first...
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5313491 |
Acquisition method for DSSS communications
Method for indicating the end of an acquisition procedure between a transmitter and receiver in a direct sequence spread spectrum communications system. At a transmitter, a first acquisition code...
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5303257 |
Carrier frequency correction for a DSSS communication system
Method for carrier frequency correction in a direct sequence code division multiple access communication system having a carrier frequency, consisting of an expected carrier frequency and a carrier...
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5303258 |
Spread spectrum communications system
A spread spectrum communications system includes: a transmitter having an input information a modulator for generating a spread spectrum signal in accordance with an input information signal...
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5291517 |
Carrier freuency corrector for a DSSS communication system
A carrier frequency corrector for a receiver for use in a direct sequence code division multiple access communication system having a carrier frequency consisting of an expected carrier frequency...
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5291515 |
Spread spectrum communication device
On the transmitter side, data to be transmitted are converted into a plurality of parallel data sets by a serial-parallel converter 101 and spread spectrum modulation is effected by means of PN...
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5276704 |
SAWC phase detection method and apparatus
A phase coded surface-acoustic-wave-correlator device used with a spread spectrum receiver. The spread spectrum receiver receives a spread spectrum signal which has a carrier signal with a phase...
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5268926 |
Method and apparatus for the simultaneous transmission of separate data signals
A method of simultaneously transmitting first and second data signals by the technique of spectrum spreading by direct sequence, comprises using the first data signal to modulate a spreading code...
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5263050 |
Adaptive threshold in a spread spectrum communications system
A transceiver for transmitting and receiving spread spectrum signals having an adaptive threshold for distinguishing between valid receive data signals and noise. The transceiver includes a...
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5245612 |
Spread packet communication system
A satellite packet communication system comprising a central station and VSAT stations. The central station generates chip-rate clock pulses and transmits a series of data on timeslots of a frame...
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5220580 |
Remote-control system with a spread-spectrum transmission link
A remote-control system with position control includes a spread-spectrum where at least three independent spread-spectrum signals are transmitted. At the receiving end, these signals are separated...
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5210770 |
Multiple-signal spread-spectrum transceiver
A method and apparatus for communication in a spread spectrum network are disclosed. Blocks of bits embodying information are assigned to corresponding subsets of binary spreading code sequences...
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5199044 |
System for detecting position of object having data carrier
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...
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5179570 |
Direct sequence spread spectrum communication system with self-synchronizing correlator and method
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...
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5155741 |
High data rate long pulse compression waveform communication system for M-ary encoding voice messages for air traffic control systems
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...
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5153598 |
Global Positioning System telecommand link
An improvement to the present system of Global Positioning System of satellites and ground stations, adding the capability of transmitting and receiving telecommand information, when required, to...
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5151921 |
Spread spectrum communication device
A spread spectrum communication device is disclosed, which can reproduce data by means of one convolver by using the upper band component and the lower band component of the spectre spectrum (SS)...
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5146471 |
Correlator for spread spectrum communications systems
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...
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5134630 |
Method and apparatus for transparent tone-in-band transmitter, receiver and system processing
In deriving a control signal for recombining the parts of the spectrum separated by a frequency notch in transparent tone-in-band signals, cross-correlation products give rise to undesirable...
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5132986 |
CSK communication system
The present invention provides new arrangements for various components of a CSK communication system: modulator, correlators, demodulator, carrier detection circuit, and synchronization control...
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5128957 |
Initial acquisition method in spread spectrum system and such system
A spread spectrum system includes a transmitter in which a frequency of a pseudonoise sequence signal is modulated in accordance with information, and a receiver in which a received pseudonoise...
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5128961 |
Distance measurement method and apparatus, and relative position measurement apparatus
A distance measurement apparatus receives pseudo noise reflected from a target object. The apparatus then obtains a cross-correlation value from cross-correlation of the received pseudo noise with...
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5063560 |
Spread-spectrum multiplexed transmission system
A spread-spectrum transmission system wherein a plurality of spread-spectrum signals are frequency division multiplexed by offsetting the center or carrier frequencies of the spread-spectrum...
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4979183 |
Transceiver employing direct sequence spread spectrum techniques
A transceiver for transmitting and receiving digital data is disclosed. The transceiver employs direct sequence spread spectrum communications techniques for reducing interference among multiple...
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4922506 |
Compensating for distortion in a communication channel
This disclosure relates to a technique for estimating the characteristics of a propagation channel by processing a cyclostationary signal which has passed through it. The technique extends to the...
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4873699 |
Method and device for coding and decoding a broadband transmission
In a method of coding and decoding a broadband transmission of the spread spectrum type, the signal to be transmitted is encoded by modulation in accordance with a code consisting of a...
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4862479 |
Spread spectrum communication system
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...
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4847861 |
Maximum length linearly occurring code sequence generator in a spread spectrum communication system
A method for determining the initial state of shift registers constituting a modular type or simple construction type maximum length linearly occurring code sequence generator used in a spread...
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4809295 |
Code lengthening system
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...
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4759034 |
Multi-step spread spectrum communication apparatus
In a pseudo-random communication system, a transmitter-generated encoded signal is to be correlated with a receiver-generated similarly encoded signal for recognizing synchronization of the...
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4665404 |
High frequency spread spectrum positioning system and method therefor
The system includes a method and apparatus for transmitting a spread spectrum signal from each of a plurality of base stations. The spread spectrum signal has a predetermined timing and has a...
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4635221 |
Frequency multiplexed convolver communication system
A spread spectrum communication system is described for decoding data from a signal having a carrier frequency and at least one of a plurality of predetermined orthogonal modulations thereon...
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4607375 |
Covert communication system
The covert communication system comprises a first arrangement to translate binary "1" bits into different portions of a predetermined PN (pseudonoise) code sequence and primary "0" bits into a...
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4606039 |
Spread spectrum coding method and apparatus
In a process for coding of radio transmissions by spectrum spreading, a signal is phase modulated by means of a 0-pi modulator controlled by a psuedo random sequence formed by combining in...
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4601047 |
Code division multiplexer using direct sequence spread spectrum signal processing
A plurality of transmitters synchronized to a common clock each transmit a data signal spread by a common bipolar pseudo-random code having a different predetermined assigned code sequence shift. A...
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4563774 |
Address coded communication system
In the disclosed communication system the digital message bits (e.g., data bits) to be transmitted to a particular receiver are individually encoded in the digital address (of K bits) of that...
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4538281 |
Adaptive acquisition of multiple access codes
An adaptive acquisition technique is disclosed for enabling the initial acquisition of a received coded signal in a direct sequence spread spectrum system using multiple access codes for code...
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4475208 |
Wired spread spectrum data communication system
A wired spread spectrum data communication system includes a modulator and a demodulator coupled to a transmission line having other signals thereon. The modulator includes a pseudo-noise (PN)...
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4392220 |
Modem to be coupled to a directional transmission line of an SS multiplex communication network
In an SS (spread spectrum) modem, a high-pass filter (81) for rejecting a low frequency component including an information signal received by demodulation, produces an SS signal component modified...
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4365327 |
Method of and means for spread-spectrum transmission
An analog signal sent from one telephone subscriber to another is periodically sampled at a transmitting terminal and each sample is held for a storage period equal to a sampling interval as well...
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4361890 |
Synchronizing system
1. In a communication system utilizing at least two independent binary coded pulse signal sequences, means for achieving and holding time synchronism between said two sequences which comprises the...
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4361891 |
Spread spectrum signal estimator
A PN sequence signal estimator is described which synergistically co-operates with an adaptive array processor and a spread spectrum communication system modem such that the adaptive array will...
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4351064 |
Communication
There is disclosed frequency modulation (FM) or phase modulation (PM) communication with a receiver having a limiter, in spread-spectrum operation for security purposes. The spectrum is spread on...
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4313197 |
Spread spectrum arrangement for (de)multiplexing speech signals and nonspeech signals
It is known to multiplex speech signals and nonspeech signals over a common communication path. One arrangement uses a portion of the frequency spectrum of the path for speech signals with the...
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4225935 |
Coding method and system with enhanced security
A coding system produces a code with enhanced acquisition security by generating a plurality of linear component codes, C 1 , C 2 , . . . C n , combining the component codes in accordance with a...
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4179658 |
Secret-signalling system utilizing noise communication
A secret-signaling, transmitted-reference, spread-spectrum system, utiliz a suppressed-noise carrier for the information signal in combination with a delayed-noise, suppressed carrier of a fixed...
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4170757 |
Method of and apparatus for transmitting clandestine radio signals
Clandestine signals are transmitted by using a surface wave acoustic device to disperse the spectrum of a pulse-modulated CW carrier. The dispersed signal is itself modulated and then transmitted...
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4156877 |
In null steering apparatus a reference to spread spectrum signals
A transmitter for transmitting a desired signal composed of a carrier modulated by a pseudorandom noise code and periodic bursts of data and a receiver including null steering apparatus wherein the...
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4052565 |
Walsh function signal scrambler
A digital speech scrambler system allowing for the transmission of scrambled speech over a narrow bandwidth by sequency limiting the analog speech in a low-pass sequency filter and thereafter...
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