Matches 201 - 250 out of 320 < 1 2 3 4 5 6 7 >
Match Document Document Title
5757786 Time synchronization apparatus and a method thereof using a global positioning system of a satellite  
A time synchronization apparatus and a method using a GPS (Global Positioning System) of a satellite. An oscillator oscillates a frequency required for a Global Positioning System of a satellite. A...
5737370 Method for initializing a network  
A method for initializing a network for data transmission between a plurality of subscribers being connected to one another in ring-like fashion, includes sending a clock signal through the network...
5734643 Method and apparatus for transmitting data over a radio communications network  
In a trunked radio data communications system using half-duplex radios, plural data messages are exchanged over a single RF working channel using a technique where a working channel repeater...
5722080 Inter-station synchronization method  
In an inter-station synchronization method establishing frame synchronization for a radio interval between radio base stations via a mobile station in a cellular mobile communication system...
5717686 Cellular spacecraft TDMA communications system with call interrupt coding system for maximizing traffic throughput  
Improved throughput is provided in a spacecraft TDMA cellular communications system by in-call signalling without the need for flag bits, while still allowing the in-call signaling to be...
5706284 Method for establishing communication path between mobile stations  
An exemplary embodiment of the present invention provides a method for establishing a communication path between a first mobile station and a second mobile station both positioned within an...
5687169 Full duplex ultrawide-band communication system and method  
An impulse radio transceiver for full duplex ultrawide-band communications. The transceiver comprises an impulse radio transmitter to transmit impulse radio signal pulses, an impulse radio receiver...
5661724 Satellite diversity scheme  
A diversity scheme for allowing a transmitter/receiver, such as a mobile unit in a mobile telecommunications system, to exchange communication signals with more than one control station, such as a...
5659545 Apparatus for mobile unit acquisition in a satellite communication system and method therefor  
To obtain service from a satellite communication system, a mobile subscriber unit must acquire a TDMA communication channel. Because the satellites move with respect to the surface of the earth,...
5654955 Network entry channel for CDMA systems  
An OCDMA satellite communication system in which an earth-based hub station receives, via a satellite, a plurality of spread spectrum signals from a corresponding plurality of earth-based...
5644572 Method and apparatus for approximating propagation delay for use in transmission compensation to orbiting satellites  
A subscriber unit (30) operates in a synchronous communication system having dynamic nodes such as satellites (12). Satellites (12) employ a strict transmit and receive time window and all...
5638399 Multi-beam satellite communication system with user terminal frequencies having transceivers using the same set of frequency hopping  
The satellite radio communication system of this invention provides communication between one or more service centers and an ensemble of fixed and mobile user terminals. One or more earth orbiting...
5638375 AGC isolation of information in TDMA systems  
In a communications system having transmissions containing certain information-of-interest at predetermined intervals in the transmission, there is provided a method for isolating and processing...
5633872 Interactive radio  
A network hub switching center routes communications from and to a plurality of RTUs. CTSs transmit data to the RTUs dispersed over a predetermined CTS geographic area and the RTUs present...
5584046 Method and apparatus for spectrum sharing between satellite and terrestrial communication services using temporal and spatial synchronization  
A system and method for spatially and temporally synchronizing satellite (space based) and terrestrial (ground based) communications services using time division multiple access between the two...
5563917 Compensation for multipath errors and ionospheric delays in differential satellite positioning systems  
Method and apparatus for reducing the contributions of receiver noise signal error and multipath signal error from signals received in a Satellite Positioning System (SATPS) from one or more SATPS...
5510797 Provision of SPS timing signals  
Methods for provision of a sequence of timing signals for one or a plurality of microprocessors, microprocessor peripheral devices or other timing-controlled instruments ("users"), using timing...
5459763 Navigation message receiver for global positioning system  
Signals representing navigation messages from four GPS artificial satellites are received by a GPS receiver and supplied to receiving processors of respective channels, which spectrally...
5450413 Means for detecting TDMA signal multiplexing position in a star network master terminal system  
A master terminal system for a star network is provided wherein a master station transmits a continuous signal to a plurality of terminal stations, and each terminal station transmits a signal to...
5440562 Communication through a channel having a variable propagation delay  
A communication system (10) communicates real time data through a channel (26) that imposes delays of variable duration on signals propagating therethrough. The channel (26) may be established...
5426642 Satellite broadcast communication system  
A satellite broadcast communication system which makes a communication via a communication satellite comprises N sub stations respectively assigned a time slot having a predetermined time width T 0...
5402424 Synchronization of clocks in a satellite communication network by preassigning constants to stations of the network  
In a satellite communication network, a reference station simultaneously announces a reference time of a reference clock once in a predetermined duration of time to all terrestrial stations of the...
5367524 Method for sequential data transmission  
Sequential data transmission by a plurality of communication units may be achieved in a communication system by using an accurate external clock and transmitting at predetermined time intervals or...
5309439 TDMA system with a virtual reference  
A TDMA system operates without the requirement for a reference burst. A station in the TDMA system monitors the bursts from other stations to determine the virtual reference. The virtual reference...
5274627 Non-regenerative multibeam satellite communications system with FDMA access and SSTDM connectivity  
An apparatus and method for a non regenerative multibeam communications system with FDMA access and SSTDM connectivity. In accordance with the present invention, FDM input signals are transformed...
5245634 Base-site synchronization in a communication system  
A central-site (100) has located within it a synchronization system for purposes of backing-up a GPS external synchronization system. The central-site (100) is coupled to a plurality of base-sites...
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...
5229997 Carrier recovery control with sequential FEC sync detection and frame sync detection  
At the transmit end of a communications system, a convolutional code of a multiplex of an information-bearing signal and a unique word is modulated upon a transmitted carrier. At the receive end,...
5172375 Multiple access satellite communication system for mini-earth station networks  
A multiple access satellite communication system in which a plurality of mini-earth stations each transmit data packets to hub earth station via a satellite over an inbound channel, while the hub...
5077761 Elastic buffer circuit  
An elastic buffer circuit for adjusting the timing between a satellite communication system of a time division multi-access (TDMA) type and a ground communication system is provided with a stable...
5072445 TDMA satellite communications system operating in wide and narrow aperture modes for receiving bursts of various timing deviations  
In a satellite communications system, a time slot assignment signal and a reference timing signal are transmitted from a central station to terminal stations to allow them to send bursts on...
4979170 Alternating sequential half duplex communication system  
A message communication system employing one or more centralized communication stations transferring messages through Earth orbit repeater satellites to or from mobile terminals with at least one...
4901313 A-point to multi-points communication system  
In order to improve the throughput of an a-point to multi-points information system having a master station for transmitting an a-point to multi-points frame and a plurality of slave stations for...
4872164 Method and arrangement for compensating shifts in delay produced by the doppler effect in bursts in a TDMA frame  
A method for compensating for shifts in delay caused by the Doppler effect in the bursts from ground stations when received by a transponder satellite, wherein a search is made within the bursts...
4847876 Timing recovery scheme for burst communication systems  
A timing recovery apparatus for a burst mode communication receiver. The apparatus provides for optimum sampling and digitizing of received data at a plurality of data rates. In particular, a VCO...
RE32905 Satellite communications system and apparatus  
A satellite communication system, which is inherently power limited, employing spread spectrum techniques in order to trade-off bandwidth for small ground station antennas. In a one-way system...
4800561 Synchronization burst transmit phase control system  
A synchronization system maintains the accuracy of time frame synchronization in an earth satellite time division multiple access system. Two metric patterns are provided for giving synchronization...
4800560 Synchronization control capable of establishing synchronization without transmission of distance information between control and local earth stations  
In a TDMA satellite communication network comprising control and local earth stations communicable with one another through a satellite, a time difference between transmission and reception of a...
4792963 Satellite clock system  
A satellite clock system in which the frequency of the onboard satellite clock, which is implemented as a relatively high uncertainty voltage-controlled oscillator, is corrected in accordance with...
4752925 Two-hop collocated satellite communications system  
A two-hop communications system utilizing two collocated spacecraft (Se and Sw) and two remote intersatellite exchange (RISE) means (Re and Rw) provides for communications between ground stations...
4748622 Satellite communication system  
A satellite communication among a plurality of small earth stations (very small aperture terminal;VSAT) through a satellite is performed by using a relay earth station which has higher power than a...
4722083 Satellite telecommunications system featuring multi-beam coverage and dynamically controlled allocation of the satellite transmission capacity  
The invention relates to a satellite telecommunications system featuring multi-beam coverage and dynamically controlled allocation of the satellite transmission capacity, of the type where a number...
4703479 Multi-direction time division multiplex communication apparatus  
A multi-direction time division multiplex communication apparatus for a central station in a multi-direction time division multiplex communication system in which the central station transmits...
4689787 Method of initially establishing burst acquisition in TDMA satellite communications system and arrangement therefor  
In order to initially establish burst acquisition in a TDMA satellite communications system, at least one of multiple earth stations (a first station) is controlled to instruct one of the other...
4688216 Station relief arrangement for use in relieving operation of a reference station in a TDMA network without reduction of frame availability  
In a TDMA satellite communication network comprising a plurality of earth stations, a predetermined one of the stations is operable as a primary reference station for producing a first and a second...
4686673 Synchronizing burst transmission phase control system  
A synchronizing burst transmission phase control system is provided for a SDMA/SS-TDMA system. The synchronizing burst transmission control system is constituted by a transmission timing error...
4630267 Programmable timing and synchronization circuit for a TDMA communications controller  
The disclosed circuit employs a single programmable timer and address decoder which identifies a plurality of bursts received from other stations in a TDMA communications network by means by...
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 selectable...
4602375 Onboard clock correction by means of drift prediction  
In an on-board satellite clock correction system of the type wherein phase errors between the satellite clock and a ground-based clock are determined and a clock correction value sent to the...
4592050 Apparatus and method for providing a transparent interface across a satellite communications link  
A mechanism is disclosed for a time division multiple access communications network, to enable the synchronizing of traffic messages between a transmitting and a receiving node. A transmit clock...
Matches 201 - 250 out of 320 < 1 2 3 4 5 6 7 >