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4984247 Digital radio transmission system for a cellular network, using the spread spectrum method  
A base station (BS) and mobile user stations (MS) each with a transmitter (S), a receiver (E) for multipath reception and a control unit (ST) are provided in each cell. Exactly one set of several...
4975926 Wireless indoor data communication system  
Described is an intraoffice communication system as the final communication link of a broadband, baseband, or fiber optic LAN. Each user or workstation is a node on the network and can transmit at...
4964138 Differential correlator for spread spectrum communication system  
A spread spectrum communications system includes an encoder for differentially encoding a spread spectrum spreading code sequence in accordance with an input data signal. Each chip of the...
4943973 Spread-spectrum identification signal for communications system  
A spread-spectrum signal which conveys identifying information for an associated information signal is superimposed on the associated signal and transmitted therewith. Such identifying information...
4939745 Apparatus for generating orthogonal sequences  
An apparatus for generating orthogonal sequences is disclosed which includes an M-sequence generator for providing a signal of M-sequence of which the component takes 0 or 1 and the period is N,...
4894841 Digital direct-sequence spread-spectrum modem  
A direct-sequence digital spread spectrum modem in which the given functions are implemented by software algorithms utilizing a microprocessor architecture. The modem is especially effective for...
4888788 Transmitting and receiving systems  
Transmitter and receiver system comprises a transmitter comprising means for generating a pseudo noise code, a first mixer for modulating transmission data by the pseudo noise code, phase shifting...
4872182 Frequency management system for use in multistation H.F. communication network  
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...
4864589 Spread spectrum power line communications  
This invention is directed to various improvements in spread spectrum power line communications. One aspect of the invention relates to collision avoidance between varius "slave" unit transmitters...
4862478 Spread spectrum communications with resistance to multipath at differential delays both larger and smaller than a chip width  
A spread spectrum communications system resistant to multipath due to differential delays equal to or less than a chip width. At the transmitter, a pseudonoise sequence is combined with data for...
4821120 Television sub-carrier transmission  
In a receiver for the reception of satellite television signals sub-carrier signals carrying, for example, data are recovered from the demodulated television signal and themselves demodulated to...
4817113 Range estimation using floating reference points  
A method of rapidly reacquiring a pseudonoise spread spectrum coded signal after short outages includes calculating the new positions of the moving stations relative to the old positions of the...
4804938 Distribution energy management system  
A bidirectional data communications distribution network is established between the system operations center (SOC) and customer terminals of a load management and electrical energy distribution...
4754283 Codeless GPS sonde  
Windfinding apparatus is described in which receiver processing of the Global Positioning System (GPS) signals is without knowledge of the spread spectrum codes. The apparatus receiver ignores the...
4748636 Method and apparatus of transmitting image data in a satellite system  
An improved method and apparatus of transmitting image data in a satellite system comprises a satellite from which image data signals of a decreased data rate and of a spread spectrum which are to...
4716574 Wirelessly functioning signal transmission system  
In a signal transmission system for broadband signals wherein the transmitting transducer and/or the receiving transducer has a non-isotropic radiation characteristic, properties of the received...
4694467 Modem for use in multipath communication systems  
A modem in which the transmitter uses spectrum spreading techniques applied to sequentially supplied input bits, a first group thereof having one spread spectrum sequence characteristic and a...
4635274 Bidirectional digital signal communication system  
A bidirectional digital signal communication system includes a plurality of terminal units in communication with a center unit. Each of the terminal units includes a signal generator for...
4617674 Synchronizing system for spread spectrum transmissions between small earth stations by satellite via an intermediate hop to a large earth station  
A communication system comprising a satellite, a master earth station (MES), and a plurality of small earth stations (SESs) provides signal transmissions addressed and transmittable to a...
4611333 Apparatus for despreading a spread spectrum signal produced by a linear feedback shift register (LFSR)  
In despreading a received spread spectrum signal, spread by means of a linear feedback shift register, the signal is demodulated and filtered and then applied to a predictor for estimating the...
4587661 Apparatus for synchronizing spread spectrum transmissions from small earth stations used for satellite transmission  
A low-power, spread spectrum synchronized communication system employing a satellite which continuously and iteratively re-transmits a PRS signal PRSm from a master earth station having a chip...
4532635 System and method employing two hop spread spectrum signal transmissions between small earth stations via a satellite and a large earth station and structure and method for synchronizing such transmissions  
In a data communication system including a plurality of small earth stations (SES), a satellite, and a master earth station (MES), a method of transmitting signal transmissions, each consisting of...
4494238 Multiple channel data link system  
A coherent communications link for simultaneously transmitting intelligence on a plurality of non-contiguous frequency channels by means of a plurality of coherent carrier signals which are...
4383322 Combined use of PN sequence for data scrambling and frame synchronization in digital communication systems  
In a communication system containing a scheme for externally synchronizing and scrambling digital data signals, serial digital data signals to be transmitted are subdivided into prescribed numbers...
4335463 Simultaneous integral multi-access transmission system on transmission lines by optical fibres  
Spectrum spread transmission system, particularly for telephone network, employing optical fibres.It comprises, for the emission part, a pseudo-random sequence generator, a multiplier, a...
3980945 Digital communications system with immunity to frequency selective fading  
A digital communications system with increased resistance to frequency selective fading. Digital signals to be transmitted are phase shift modulated upon a spectrum spreaded carrier. The carrier...
3808536 COMMUNICATION SCRAMBLER SYSTEM  
A scrambler system in which amplitude zero-crossings in speech are encrypted at a transmitter by combination with a pseudo-random digital sequence, the reverse process occurring at the receiver....
3701019 ALARM SYSTEM USING CODED SIGNALLING  
A signaling system for detecting at a central station a message from a remote location at which one or more different messages can be generated. A coded signal is generated at the remote location...
3380023 Electronic alarm system