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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 6507926 | Mitigation of false co-channel uplink reception in a processing satellite communication system using stagger The present invention provides a method and apparatus for preventing show-thru (and therefore misinsertion of unintended traffic) among uplink beams transmitted to a satellite. The method includes the steps of selecting (402) an uplink A stagger value, se... | 01/14/2003 |
| 6501743 | Apparatus and method of network synchronization in asymmetric two-way satellite communication system An apparatus and method of network synchronization for synchronous burst transmission in an asymmetric two-way satellite communication system. Network synchronization information is broadcast to all remote stations using an adaptation field structure that... | 12/31/2002 |
| 6496488 | Modularly clustered radiotelephone system A power-conserving time division multiple access (TDMA) radio telephone system is disclosed in which a cluster of subscriber stations, remote from a base station, employs a common pool of frequency-agile modems each of-which digitally synthesizes, on a ti... | 12/17/2002 |
| 6493334 | Spread spectrum time-division multiple access communication scheme A new DTX-MAC protocol is proposed for a cellular radio telecommunications system with many users. Several users are allowed to transmit packets within a time-slotted frame structure. Direct sequence spread spectrum technique is used to spread the packets... | 12/10/2002 |
| 6490704 | Method for correcting synchronization error and radio system The invention relates to a digital radio system and to a method for correcting a synchronization error in a digital radio system comprising at least one base station (100) communicating with terminals (102, 104) in its coverage area, and a mobile telephon... | 12/03/2002 |
| 6487252 | Wireless communication system and method for synchronization An orthogonal frequency division multiplexed wideband communication system provides improved time and frequency synchronization by inserting an unevenly spaced pilot sequence within the constellation data. A receive correlates the received data using the ... | 11/26/2002 |
| 6480483 | Frame synchronization system between base stations of mobile radio communication system and base station device employing this system The disclosure concerns an inter-base station frame synchronization system for use in a mobile communication system having at least one master base station and a plurality of slave base stations. The master base station is arranged to transmit a control c... | 11/12/2002 |
| 6477151 | Packet radio telephone services A method of synchronising radio signal transmission slots at a mobile station to radio signal reception slots at a base station subsystem to account for a propagation delay between the mobile station and the base station subsystem. The method is applicabl... | 11/05/2002 |
| 6452948 | Method for baud-clock phase synchronization in a TDMA digital communications system and apparatus therefor A time division multiple access digital communications system (12) is provided. The system (12) has a base station (14) configured to generate a receive baud clock (86) and has a receiver (18) and a transmitter (20). The system also has a subscriber unit ... | 09/17/2002 |
| 6449290 | Methods and arrangements in a radio communications system Methods and an arrangement for synchronizing communication of framed data via asynchronous base stations (BS1, BS2) in a cellular communication system are presented. The synchronization methods are performed continuously by sending out certain system fram... | 09/10/2002 |
| 6434361 | Synchronization burst processor for a processing satellite A synchronization burst processor (56) used in a processing satellite (12) in a satellite based communications system (10) is provided with a sync burst memory (72), a first double correlator (74), a second double correlator (76) and a modulus module (78)... | 08/13/2002 |
| 6430170 | Method and apparatus for generating random numbers from a communication signal A system and method for generating random numbers in a wireless communication network is presented. The noise present in the signal received by a wireless receiver is extracted to form random numbers. Wireless transmitters typically are identified by a sy... | 08/06/2002 |
| 6377556 | METHOD AND APPARATUS TO RESYNCHRONIZE PPP ON UM INTERFACE WITHOUT AFFECTING PPP ON A RM INTERFACE AND TO RESYNCHRONIZE PPP ON A RM INTERFACE WITHOUT AFFECTING PPP ON A UM INTERFACE A method, within a wireless communication system, and a wireless MT2 device which provide for the resynchronization of a PPP link on each one of a Um and Rm interface without affecting the other of the Um and Rm... | 04/23/2002 |
| 6356763 | Downlink observed time difference measurements A mobile communication station in a wireless communication network is used to measure the respective times of arrival of radio signals respectively transmitted by a plurality of radio transmitters in the network. The mobile communication station is provid... | 03/12/2002 |
| 6344821 | Mobile communication system and inter-bases station synchronzing method A plurality of base stations each calculate a distance function value with respect to a mobile station by detecting up signal therefrom in their own receiver (step S15), and transmit the calculated value to a base station controller (step S16). When a bas... | 02/05/2002 |
| 6345043 | Access scheme for a wireless LAN station to connect an access point An access scheme for a wireless LAN station to connect an access point on the network. This scheme allows a wireless station to finish all the processes from search to registration with an AP at a very high speed. Firstly, the time interval of beacon tran... | 02/05/2002 |
| 6331998 | Partially matched filter for spread spectrum communication A method of acquiring a transmitted pseudo noise (PN) code c(t) from a received signal r(t) that is data modulated. The method includes, for a BPSK modulated signal, multiplying the received signal r(t) by cos(ω0 t) and sin(ω0 t), ... | 12/18/2001 |
| 6320852 | Base station host apparatus used in mobile communication system which employs a site diversity receiving method and a signal processing method A technique used in a mobile communications system. A mobile terminal station transmits a signal subjected to an error-correction encoding processing. Each of a plurality of base stations receives the signal transmitted from the mobile terminal station vi... | 11/20/2001 |
| 6317439 | Architecture for a SONET line unit including optical transceiver, cross-connect and synchronization subsystem A SONET interface line unit which includes an interface to a SONET ring, an STM switch fabric, and STM synchronization function within a single module. The line unit includes an optical interface for communicating SONET traffic with a SONET ring, an ATM i... | 11/13/2001 |
| 6308076 | Methods and systems for synchronization with multiple frequency offsets and known timing relationships Methods and systems are provided which store frequency settings before switching frequencies, for example, before assignment to the traffic channel when switching between a ground station and another mobile station), thus, making it possible to recall the... | 10/23/2001 |
| 6304560 | Personal handy-phone system wireless local loops and methods of transmitting information within personal handy-phone systems The present invention provides methods of transmitting information within a personal handy-phone system wireless local loop and personal handy-phone system wireless local loops. One embodiment of a personal handy-phone system wireless local loop according... | 10/16/2001 |
| 6298072 | Real-time transaction synchronization among peer authentication systems in a telecommunications network environment System and method for synchronizing transaction data in real-time within a network environment. The system and method include and involve a plurality of authentication subsystems. Each authentication subsystem has a data storage subsystem and a processor.... | 10/02/2001 |
| 6298048 | TDMA system timer for maintaining timing to multiple satellite simultaneously A method for timing correction in a communications receiver includes the steps of (a) setting a timer to a known value; (b) defining a first window by defining a first rollover value; (c) defining a second window by defining a second rollover value; (d) d... | 10/02/2001 |
| 6285666 | Spread-spectrum communication method and apparatus The communication period of spread spectrum data is divided into a plurality of portions, and an adjustment period for receiving the spread spectrum data is provided between one data-communication period and another communication period. Thereby, the sett... | 09/04/2001 |
| 6278699 | Synchronization techniques and systems for spread spectrum radiocommunication A method and apparatus for synchronizing to a time structure associated with base station transmissions in a radiocommunication system are described. A broadcast control channel can contain synchronization symbols within one or more of a plurality of time... | 08/21/2001 |
| 6243366 | Method and apparatus for providing interactive two-way communications using a single one-way channel in satellite systems A method and apparatus for doubling the capacity of a satellite communication system providing interactive two-way communications with a single one-way communication channel where two parties are utilizing earth stations located within a single satellite ... | 06/05/2001 |
| 6243372 | Methods and apparatus for synchronization in a wireless network As part of a preferred communication protocol, base stations which are synchronized to a PSTN of a wireless communication network, periodically transmits a preamble. A remote detects the preamble and, upon verification of the data contained in the base st... | 06/05/2001 |
| 6230021 | Digital cordless communication system with frequency deviation correction capability A digital cordless telecommunication system capable of maintaining the enhanced frequency stability of radio transmission signals from stationary base stations by use of a specific clock signal including either a high-precision clock or a reference clock ... | 05/08/2001 |
| 6208626 | Real-time satellite communication system using separate control and data transmission paths A control communication method includes synchronizing a timing in a central earth station and a plurality of remote earth stations such that a predetermined control time period having a plurality of time slots is synchronized among the central earth stati... | 03/27/2001 |
| 6201819 | Process for transmitting data packets from mobile stations to base stations in mobile radio systems operated on the time multiplex system A process for the transmission of data packets from mobile stations to base stations in mobile radio systems operated by the time-division multiplex method where an effective utilization of resources and a reduced amount of signalling is achieved in the t... | 03/13/2001 |
| 6198736 | Telecommunications system An air frame synchronisation signal is transmitted as a data signal over a PCM link from a central unit to a plurality of remote radio transceivers, allowing the remote radio transceivers to recreate the AFS signal with the desired accuracy, compensating ... | 03/06/2001 |
| 6154457 | Mobile station having improved DCCH synchronization A method is disclosed for operating a mobile station (10). The method includes a first step of receiving a forward channel from a base station (30), the forward channel being transmitted to contain repeating frames each comprising N time slots, individual... | 11/28/2000 |
| 6147982 | System and method for synchronizing acquisition for a code modulated communication system A system and method for a synchronizing acquisition of a transmitted signal with a local code in a code modulated communication system. The local code is comprised of a replica of the transmitted code. Samples of the transmitted code are correlated with t... | 11/14/2000 |
| 6118769 | Method and apparatus for voice intranet repeater and range extension In a digital communications system for transmitting and receiving digital data over a CSMA-type network having a source for transmitting a source signal comprising a synchronization interval and a data interval and at least one receiver for receiving a se... | 09/12/2000 |
| 6118770 | Voice-channel frequency synchronization A synchronized frequency generating system is provided which includes a main crystal clock, for producing a basic frequency FB, a channel sampling phase locked loop (PLL) unit, connected to the main crystal clock, for converting the basic frequ... | 09/12/2000 |
| 6108319 | Satellite payload processing system providing on-board rate alignment A rate alignment apparatus for a satellite includes an on-board clock, an input switch, an output switch and a ping-pong buffer pair including first and second buffers and connected to the input switch and the output switch. The first and second buffers r... | 08/22/2000 |
| 6108318 | System and method for data link synchronization A system and method for improving communication between two user terminals in a telecommunication system is disclosed. When two user terminals, such as in a satellite-based system with a terrestrial network interface, switch from a double-hop connection w... | 08/22/2000 |
| 6098100 | Method and apparatus for detecting a wake packet issued by a network device to a sleeping node In a method and apparatus for detecting a wake packet among data bytes in a packet frame issued by a network device, the data bytes in the packet frame are initially compared with a sync byte to detect start of a synchronization stream of the wake packet.... | 08/01/2000 |
| 6078786 | Method and device for measuring the distance between two stations connected by a communications channel The invention relates to a method and a device for distance measuring between two stations (A1, B1) connected by a communication channel. The method is based on a command structure, wherein the satellite (A1, B1), by means of which a distance is to be det... | 06/20/2000 |
| 6072786 | Method for acquisition of spotbeam beacon frequency within a satellite communications system A method for acquiring a spotbeam beacon frequency is disclosed. The method comprises a fast synchronization procedure wherein the beacon frequency of the spotbeam is first acquired using a carrier acquisition process. A coarse time acquisition procedure ... | 06/06/2000 |
