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| Number | Title | Issue Date |
| 4993044 | Spread-spectrum communication receiver A spread-spectrum communication receiver uses two convolvers and a phase shifter to demodulate data from correlation outputs of the convolvers. The demodulated output is used to control the phase-shifting amount of the phase-shifter and gains of the corre... | 02/12/1991 |
| 4972430 | Spread spectrum signal detector 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 loop for AGC control. An IF sampler quantizes th... | 11/20/1990 |
| 4969160 | Dual channel clock recovery circuit Apparatus is provided for detecting the presence of a periodically keyed random modulated signal source. Received signals are stepped down to an intermediate frequency and then applied to pairs of narrow bandpass filters. The output from pairs of the narr... | 11/06/1990 |
| 4962507 | Feed forward spread spectrum signal processor A communications receiver for a code division multiple access (CDMA) satellite communication system in which a plurality of data carriers share the same band. A pilot carrier transmits a timing reference used by all receivers to acquire the clock used in ... | 10/09/1990 |
| 4943978 | Digital interface unit An interface apparatus and method is disclosed which allows communication of digital data messages between a first type of data terminals (10 and 65) employing a message protocol (FIG. 1a) with a "free text-type" message, and other user devices employing ... | 07/24/1990 |
| 4930140 | Code division multiplex system using selectable length spreading code sequences A code division multiplex system for use in a spread spectrum communication system utilizes selectable length spread spectrum spreading code sequences. At the encoder, one of a pluraluty of a spread spectrum spreading code sequences having a given fixed l... | 05/29/1990 |
| 4930139 | Spread spectrum communication system The spread spectrum digital communication system includes data input devices for generating digital information signals to be transmitted using radio signals. A chip stream generator converts the data bits into chip streams that are either complemented or... | 05/29/1990 |
| 4905221 | Earth station capable of effectively using a frequency band of a satellite For use in a satellite communication system which carries out communication through a satellite by the use of an up-link frequency band and a down-link frequency band, each of the up-link and the down-link frequency bands has a plurality of frequency subb... | 02/27/1990 |
| 4890297 | Burst jammer erasure circuit for spread spectrum receivers 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, slow response wideband filter means, and a hard li... | 12/26/1989 |
| 4879726 | Spread spectrum communications system In a spread communications systems, a filter is inserted in a transmitter and a receiver, respectively. The filter in the transmitter is an FIR filter and the filter in the receiver has a characteristic inverse to that of the FIR filter.... | 11/07/1989 |
| 4866733 | Radio bus system A radio bus system formed by combining a spread spectrum (SS) communication radio bus system with an electrical power line bus system using a spread spectrum modulated signal of the same signal format as that used in the radio bus system. An information s... | 09/12/1989 |
| 4811357 | Secondary channel for digital modems using spread spectrum subliminal induced modulation A system and method are provided for use of a secondary channel in high speed (greater than 2400 bits per second) wire line modems to provide low speed (around 110 bits per second) non-interfering communications for control or monitoring functions. The se... | 03/07/1989 |
| 4790012 | Encryption-decryption system In a data encrypting/decrypting system both the encoding and decoding stations are receptive of a common source of time varying digital signals. The digital signals in the encoding station are applied to one or both of circuits for encrypting data supplie... | 12/06/1988 |
| 4771417 | High speed modem A modem is disclosed having a data transmission protocol involving lower-speed, full-duplex operation during the connect sequence with a remote modem and an automatic switch to higher-speed, half-duplex operation for data transfer. Further, the modem data... | 09/13/1988 |
| 4763103 | Process and method for wide band transmission, particularly for data transmission over an electricity distribution network At transmission (10) each bit for transmission is coded as a function of its state by producing (12) a particular coding frequency combination, these being divided into two distinct bands spaced one from another and the coding combinations being chosen su... | 08/09/1988 |
| 4750036 | Interactive television and data transmission system A spread spectrum system provides bidirectional digital communication on a vacant television (TV) channel for simultaneous use by more than 75,000 subscribers using time and frequency division multiplex signals locked to horizontal and vertical sync pulse... | 06/07/1988 |
| 4743906 | Time domain radio transmission system A communications system wherein there is employed a signal mixer in which a received signal is multiplied by a template signal, and then the output of the mixer is integrated. By this process, usable signals are obtained which would be otherwise obscured ... | 05/10/1988 |
| 4706093 | Monopulse tracking system substantially free of externally generated noise A monopulse tracking system utilizing at least two channels, each of which has a different spreading/despreading pseudo-random noise function associated therewith. In conjunction with a monopulse antenna, one of the channels is utilized to develop a sum s... | 11/10/1987 |
| 4675839 | Receiver for a spread spectrum communication system having a time-multiplexed convolver A convolver having at least a first interdigital transducer for generating a first surface acoustic wave in response to an input signal and a second interdigital transducer for generating a second surface acoustic wave counter to the first surface acousti... | 06/23/1987 |
| 4653053 | Performance monitoring of antijam satellite communication network A scheme for monitoring the performance of a multiple access satellite communication network, particularly an antijam pseudo-noise spread code division multiple access network, operational in the presence of one or more up-link jammers having arbitrary wa... | 03/24/1987 |
| 4641317 | Spread spectrum radio transmission system A communications system wherein an intelligence signal modulates the spacing of relatively narrow pulses of a fixed rate pulse train, and these pulses key on a transmitter which employs a pair of series connected avalanche mode operated transistors. These... | 02/03/1987 |
| 4638417 | Power density spectrum controller A power density spectrum controller circuit which incorporates a programming element in conjunction with a voltage controlled oscillator and which uses spread spectrum techniques to provide a relatively clean output signal having little or no ripple, litt... | 01/20/1987 |
| 4570265 | Random frequency offsetting apparatus for multi-transmitter simulcast radio communications systems Apparatus for randomly offsetting the frequencies of each transmitter in a simulcast radio communications system is described. The random frequency offsetting apparatus includes a random noise source for generating a noise signal which is amplified and lo... | 02/11/1986 |
| 4425661 | Data under voice communications system A communications system capable of simultaneously transmitting voice and data information. The spectral energy of the data signal is smeared by spreading it in a spectrum with energy packed in the lower frequency range under the conventional voice signal ... | 01/10/1984 |
| 4387465 | Sequential threshold detector An improved sequential threshold detection circuit for use in the receiver of a spread-spectrum communication system is disclosed wherein the improvement resides in the employment of a feedback circuit for maintaining a pre-selected constant median dismis... | 06/07/1983 |
| 4342119 | Multi-tone jammer A waveform capable of jamming some or all of the channels of a multiple channel receiver is developed by a multi-tone jammer that uses a digital counter and a digital/analog converter to generate a ramp voltage for a voltage controlled oscillator (VCO). T... | 07/27/1982 |
| 4325138 | Continuous wave adaptive signal processor system A spread spectrum carrier wave device, such as an altimeter, is provided having a transmitting antenna in close proximity to the receiving antenna. The reference signals being transmitted are electromagnetically coupled into the receiving system as undesi... | 04/13/1982 |
| 4320513 | Electric circuit for the production of a number of different codes An electric circuit, in particular for devices and systems operating on an SSMA basis, for the production of a number of different codes according to a linear law of formation and having practically negligible values of cross correlation coefficients and ... | 03/16/1982 |
| 4267592 | Anti-jam radio Disclosed is a method and apparatus for transceiving full duplex anti-jam radio signals in a burst of audio data on a carrier frequency that is pseudorandomly selected.... | 05/12/1981 |
| 4222115 | Spread spectrum apparatus for cellular mobile communication systems An apparatus is disclosed for a cellular mobile communication system utilizing a spread spectrum. A plurality of fixed base stations is connected with a central processor so that calls originating in any cell can terminate in any other cell. The available... | 09/09/1980 |
| 4206462 | Secure communication and ranging system 15. In a secure communication system a transmitter comprising first means to modulate a carrier wave with a sub-carrier wave and a desired signal, a code generator synchronized to said sub-carrier wave, second means to modulate the output of said first mo... | 06/03/1980 |
| 4152651 | Method for detecting the code-phase coincidence in an SSMA receiver A method for detecting the coincidence between the phase position of a code of an SSMA signal which has been received with a heterodyne receiver and the code which is produced in the receiver through means for evaluating the signal power increase in an in... | 05/01/1979 |
| 4134071 | SSMA Data transmission system In an SSMA data transmission system in which each binary information signal (kij) is multiplied with a binary address ai (t-j T) having Z binary digits and is transmitted after being modulated onto a carrier oscillation signal cos (Ï... | 01/09/1979 |
| 4112368 | Constant amplitude carrier communications system A communication system comprising one or more communication units (transceivers) in which the transmitter includes means for modulating the carrier wave in such manner that the carrier amplitude is not varied by signal information but nevertheless signal ... | 09/05/1978 |
| 3947674 | Code generator to produce permutations of code mates A class of pseudo-noise multiplexed codes including coding mates having cooperating autocorrelation function which upon detection provides an impulse autocorrelation function. The code mates include at least one blank digit slot in the repetitious period ... | 03/30/1976 |
