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| Number | Title | Issue Date |
| 5111454 | Digital cellular TDM system employing 6:1 packing of transcoded information A digital cellular time-division multiple access (TDMA) system including a cellular switch and at least one base site employing 6:1 packing of transcoded information. The system incorporates the VSELP speech encoding algorithm to transcode data input from... | 05/05/1992 |
| 5109393 | Mobile communications system insensitive to false frame sync In a mobile communication system, the base station sequentially scans speech channels and a control channel to monitor call status and detect a call request from a mobile station containing a frame sync and an encoded user's identifier. A successive bit s... | 04/28/1992 |
| 5068916 | Coordination of wireless medium among a plurality of base stations Method and apparatus for coordinating a usage of a wireless transmission medium among a plurality of transmission units (12). The transmission medium is of a type that is utilized in accordance with a protocol having a transmission period that is comprise... | 11/26/1991 |
| 5040175 | Wireless information transmission system A wireless local area network (10) includes a plurality of stations (12) adapted to transmit and receive message packets via a distribution system (30). In a time division multiplexing embodiment the network (10) operates using successive timing frames (F... | 08/13/1991 |
| 5040195 | Synchronization recovery circuit for recovering word synchronization In a cellular-type communication system, a receiving apparatus of a mobile station which has received a forward control channel message recovers word synchronization of the received data. More particularly, the receiving apparatus converts serial FOCC dat... | 08/13/1991 |
| 5020051 | Duplex communications method and system A method of establishing a digital time-division duplex radio communication link between one of a plurality of portable units and a base unit in a cordless telephone system, transmissions from the base unit are allowed only on a ping-pong basis with trans... | 05/28/1991 |
| 4984290 | Method of controlling communications in a cellular radiotelephone system A cellular system employs a subaudible signalling control protocol. The protocol includes transmitting supervisory related signals between the radiotelephone and one of the cell sites at a first subaudible digital bit rate, and transmitting data messages ... | 01/08/1991 |
| 4972410 | Method and apparatus for controlling signal coherency in simulcast systems A simultaneous broadcast (simulcast) system transmits from a control site to two or more remote sites the same data information along with a synchronous digital signal via a synchronous digital transmission network. At the remote sites, a clock signal is ... | 11/20/1990 |
| 4964121 | Battery saver for a TDM system A power saving method and apparatus in a time division multiplexed system (10) capable of providing a synchronous full duplex communication between a telephone network (12) and a plurality of remote communication units (18). A communication resource contr... | 10/16/1990 |
| 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 receiving the a-point to multi-points frame and to insure r... | 02/13/1990 |
| 4882729 | Paging controller having a multiplex bus arrangement A paging controller for a paging communication system exchanges information by a global multiplexed bus arrangement. The bus arrangement permits voice, data and control information to be exchanged between a common memory and a plurality of I/O modules in ... | 11/21/1989 |
| 4873683 | TDMA radio system employing BPSK synchronization for QPSK signals subject to random phase variation and multipath fading A time division multiple access (TDMA) radio system conveying a quadrature phase shift keying (QPSK) modulated data signal is disclosed. In order to overcome multipath distortion and phase variation introduced by the radio channel, a synchronizing poriton... | 10/10/1989 |
| 4866709 | Dynamic frame length communication system A dynamic frame length slotted ALOHA communication system has a central station which monitors the traffic congestion and determines the optimum frame length. This is transmitted to the sub-stations in the form of a service information message when there ... | 09/12/1989 |
| 4853686 | Method and apparatus for establishing a connection in shortwave radio networks A connection (link setup) between individual stations of a radio network may be carried out fully automatically, and even with poor transmission quality, only the wanted stations are activated. A call signal includes a synchronization signal having narrow... | 08/01/1989 |
| 4852090 | TDMA communications system with adaptive equalization A method and means for reducing multipath interference distortion in a time-division multiple access (TDMA) communications system is disclosed. A transmitting station (100) formats one or more equalizer synchronization words with a first user's data word,... | 07/25/1989 |
| 4825437 | Clock recovery arrangement especially for an information transmission system using the TDMA principle in one transmission direction Clock recovery arrangement suitable more specifically for an information transmission system using the TDMA principle in one transmission direction. A clock recovery arrangement (24, 13) employed in an information transmission system comprised of a centra... | 04/25/1989 |
| 4804954 | Battery saving method for portable communications receivers A system transmitting synchronization signals and coded message signals is described. In particular, coded synchronization signals are used to indicate the transmission of coded message signals or the absence of transmission of coded message signals follo... | 02/14/1989 |
| 4803703 | Apparatus and method for fine synchronization of a communication receiver A system and method is described for synchronizing a paging receiver decoder to receive information in the form of digitally encoded signals. The digital signals include a synchronization signal followed by message data. The synchronization signal include... | 02/07/1989 |
| 4803726 | Bit synchronization method for a digital radio telephone system A method and means for maintaining continuous bit synchronization of data transmitted from a remote unit through a base unit to a landline unit is disclosed. An input data stream at a first bit rate, such as digitized or encrypted speech, is interleaved w... | 02/07/1989 |
| 4759016 | TDMA communication system having common local path medium and local time slot for intraoffice calls A multiple access communication system includes a central station and terminal stations. Each terminal station serves a plurality of subscriber stations and exchanges with the central station downstream and upstream time-division multiplexed (TDM) signals... | 07/19/1988 |
| 4726014 | Cellular mobile radio service telephone system An improved cellular mobile radio telephone system is described wherein the switching matrices used to provide communication paths between subscribers is also used to provide paths for carrying control information between a network control and the various... | 02/16/1988 |
| 4694473 | Data communication system with block synchronization data in mobile radio A block synchronization data communication system enables data communication to be properly effected even through a transmission channel under an extremely unfavorable conditions as in mobile radio such as automobiles. The block synchronization data commu... | 09/15/1987 |
| 4688210 | Method of and arrangement for synchronizing the receiver arrangements in a digital multiplex transmission system A digital multiplex radio transmission system wherein transmission channels between a fixed radio station and a plurality of mobile radio stations may be established by code division multiplex or frequency division multiplex, individual message channels b... | 08/18/1987 |
| 4683566 | Digital radio communication system A digital radio communication system in the form of a multi-direction time division multiplex network including a central station having one working transmitter and receiver and one standby transmitter and receiver. Both the working and standby transmitte... | 07/28/1987 |
| 4644534 | TDMA point-to-multipoint communications system and its use A TDMA point-to-multipoint communications system composed of a central station and a plurality of substations, with multiple utilization of a transmission band and with the transmission time between the central station and the substations having a differe... | 02/17/1987 |
| 4642806 | Communications network having a single node and a plurality of outstations In a time division multi-access communications system each burst in each slot commences with a preamble and the clocks used to control the sequence of operations are synchronized by means of these preambles. In particular the outstations control their tra... | 02/10/1987 |
| 4597087 | Frequency hopping data communication system The frequency hopping data communications system comprises a first circuit arrangement to produce identical first and second pseudo-noise code streams time displaced with respect to each other, each of the first and second code streams producing a frequen... | 06/24/1986 |
| 4559633 | Spread spectrum system A spread-spectrum communication system includes a transmitter for transmitting a spectrum-spread signal and a receiver for receiving the data signal. To establish synchronism between the signals transmitted and received, the receiver includes a first loop... | 12/17/1985 |
| 4530087 | Space diversity receiving system for multi-direction time division multiplex communication A space diversity receiving system for the central station of a multi-direction time division multiplex communication network having a plurality of satellite stations, and one central station. Each satellite station transmits signals to the central statio... | 07/16/1985 |
| 4519068 | Method and apparatus for communicating variable length messages between a primary station and remote stations of a data communications system A data communications system is described in which variable length messages are communicated between a general communications controller (GCC) and a plurality of portable and mobile radios. The variable length messages include a bit synchronization field,... | 05/21/1985 |
| 4517669 | Method and apparatus for coding messages communicated between a primary station and remote stations of a data communications system A data communications system is described in which variable length messages are communicated between a general communications controller (GCC) and a plurality of portable and mobile radios. The variable length messages include a bit synchronization field,... | 05/14/1985 |
| 4513415 | Broadcast synchronization and supervision system A system is disclosed which employs existing broadcast stations to transmit synchronizing and supervisory signals for use by telephone communication devices at remote locations for timing purposes and for coordinating their activities with activities at o... | 04/23/1985 |
| 4509199 | Power supply systems for use in radio communication systems In a power supply system for use in a radio communication system comprising a base station for transmitting and receiving radio signals, one or more repeater stations for repeating the radio signals, and a terminal station communicating with the base stat... | 04/02/1985 |
| 4496975 | One-way data transmission systems A one-way teletext data transmission system is an improvement over a known eletext system sold under the trademark "ANTIOPE" which transmits data having error correction and ciphering. The length of the transmitted data pack is always the maximum pack leng... | 01/29/1985 |
| 4483000 | Circuit for eliminating spurious components resulting from burst control in a TDMA system In an electronic circuit comprising a modulator (35) and used in each substation of a TDMA system and responsive to a baseband data signal sequence for producing a burst in accordance with a first burst control pulse, spurious components resulting in the ... | 11/13/1984 |
| 4472802 | System of transmitting information between a central station and sub-stations The system for transmitting information between a central station (SP) and sub-stations (SS1, SS2, SS3) operates, for the transmission from the sub-stations to the central station in accordance with a method (TDMA method) which consists in providing time ... | 09/18/1984 |
| 4470148 | Satellite-receiver time division multiple-access burst duration and guard space monitor A burst duration and guard space monitor circuit which produces burst duration and guards space signals which are substantially unaffected by nulls or near nulls in a received QPSK signal. The received QPSK signal is compared with a fixed threshold voltag... | 09/04/1984 |
| 4470141 | Multi-direction time division multiplex communication system The inventive system includes a central station and a plurality of satellite stations which communicate on a time division multiplex basis. The central station generates frame synchronizing and clock signals, along with digital communication signals, whic... | 09/04/1984 |
| 4392132 | Wireless signaling system A wireless signaling between one or more remote locations and a central location includes a transmitter at each remote location and switches for providing signals indicating status information on each remote location. A logic circuit coupled to the switch... | 07/05/1983 |
| 4385377 | Pulse position time division surface wave device transmitter A device for sample modulating electronic information signals, which includes a pulse position modulating circuit having a first input coupled to receive information signals, a second input coupled to simultaneously receive uniformly spaced sampling signa... | 05/24/1983 |
