Matches 101 - 150 out of 155 < 1 2 3 4 >
Match Document Document Title
6052406 Frequency hopping synchronization and tracking in a digital communication system  
There is disclosed an improved frequency hopping synchronization and tracking system for bit syncing and frame syncing a digital data signal as transmitted by a radio transmitter. A detection means...
6034988 Spread spectrum apparatus and method for network RF data communications having extended communication channels  
An apparatus and methods are provided for network radio frequency ("RF") data communications. The apparatus preferably has an extended channel radio transmitter for selectively transmitting data...
6031863 Wireless LAN system  
The wireless LAN system has an information-carrying capacity which is several times the transmission rate obtained by a single cell. The wireless LAN system properly notifies hopping information...
5966665 Wireless communication system communicable among a base unit and a plurality of handsets  
A wireless communication system capable of communicating by a frequency hopping method, having a base unit that can be connected to an external telephone circuit and multiple handsets that can...
5946624 Synchronized frequency hopping  
A synchronized frequency hopping method and apparatus for use in a cellular communication system where the cellular communication systems has a plurality of cells and a plurality of frequencies...
5838673 Radio telephone system for minimizing co-channel interference utilizing geographic separation of signals and transmission power control  
A system for minimizing co-channel interference between transmission sectors at their common periphery. The system exploits the geographic separation of potentially interfering mobile transmitters...
5781582 Frequency agile transceiver with multiple frequency synthesizers per transceiver  
A base station communicates with a plurality of mobile stations over a cellular network. In one embodiment, the base station includes a receiver having a receiver synthesizer input, where the...
5715275 Spectrum communication method and apparatus for delaying read sequence series  
For spread spectrum communication using a frequency hopping method, this invention is to provide a method and an apparatus for two-way simultaneous communication for transmitting/receiving with a...
5710789 Signal synchronization system for encoded signals  
A system for receiving, correlating and interpreting secured wireless transmissions, periodic or otherwise, including multiplexed receivers, robust correlator design, a state machine device for...
5677928 Spread spectrum communication system  
Digital information is convolved with a pseudorandom code and then transmitted at radio frequency in a spread spectrum signal to a receiver also containing the same pseudorandom code. Since the...
5638361 Frequency hopped return link with net entry channel for a satellite personal communications system  
A satellite network communication system in which a plurality of subscriber handset terminals communicate with a ground hub station on traffic frequency channels using spread spectrum orthogonal...
5590410 System and method for frequency based acquisition acknowledgment between transmitter and receiver  
A communications system includes at least two communications units, each communication unit including a transmitter capable of transmitting to the other unit on one or more frequencies, under the...
5586141 Interface protocol method for use in a frequency hopping radio system having first hopping code for synchronization and second hopping code for communication  
A method of communicating between two or more radios each capable of transmitting and receiving signals between one another on two or more radio channels wherein the radios hop from channel to...
5583866 Method for delivering broadcast packets in a frequency hopping local area network  
A method used in a communication system (10) having central controllers (14) in communication with a plurality of user devices (12) where synchronizing data (34) and user data (35) are transmitted...
5568510 Apparatus and method for obtaining synchronism between a base station and a portable unit arranged for operation in a frequency hopping system  
A cordless telephone arranged for operation in a frequency hopping system quickly establishes communications between a base unit and an associated handset unit in the telephone. Synchronization...
5561686 Radio information communication system using multi-carrier spread spectrum transmission system  
In a radio information communication system of this invention, at least part of a transmission data string is first divided into a plurality of bit strings when data is transmitted by radio in a...
5546422 Method of transmitting low-power frequency hopped spread spectrum data  
An acknowledgement paging system is described which fits within the existing infrastructure of a paging network and which provides low cost manufacture and low power operation while still enabling...
5537434 Frequency hopping control channel in a radio communication system  
A communication system having a frequency hopping scheme which provides an improved initial synchronization in mobile stations of control channels. Special synchronization bursts are inserted into...
5519717 Method for time drift reduction of frequency hopping network clock  
This invention provides a method for substantially reducing the time drift f a network clock in a frequency hopping communications system, without the need for a master unit to keep network time....
5509027 Synchronization method in a frequency hopping local area network having dedicated control channels  
A method for a synchronizing user devices (12) performing handoffs includes providing a set of location synchronizing frequencies and data frequencies selected from a hopping set used by network...
5506863 Method and apparatus for operating with a hopping control channel in a communication system  
A communication unit for use in a communication system is provided which includes a hopping mechanism which hops communication frames over a plurality of carrier frequencies according to a...
5504774 Data transmitting and receiving apparatus  
A data transmitting and receiving apparatus is disclosed. The receiving apparatus receives a spread spectrum signal prepared by modulating a carrier wave with data to produce a data modulated...
5483550 Mobile cellular radio systems  
A frequency hopped cellular mobile radio system, comprising a plurality of base stations each affording a cellular region, or cell, within which communication is facilitated with a plurality of...
5459760 Transmitting and receiving apparatus  
In a transmitting and receiving apparatus for transmission and reception of signals based on the frequency hopping spread spectrum scheme, hopping patterns used for a transmitter and a receiver are...
5446769 Method for providing hand-offs in a frequency hopping communication system  
A method for handing off user devices (131-134) between network control processors (110, 120) in a frequency hopping communication system (100) includes establishing a set of synchronization...
5442660 Frequency hopping sequence using galois field  
Frequency hopping enables a plurality of channels to share the same bandwidth without interference. The present invention utilizes Galois Field theory to define frequency hopping sequences for a...
5442659 Radio communications system with fault tolerant frequency hopping synchronization  
A method for use in multicellular communication network system of the type having base stations and a plurality of remote stations. The method achieves reliable and fault tolerant synchronization...
5430775 Method and apparatus for a radio communication system  
A radio communication system (10) operates over a sequence of communication channels using a synchronized channel hopping protocol. A first communication device (16) is provided which is capable of...
5428637 Method for reducing synchronizing overhead of frequency hopping communications systems  
A method for reducing the synchronization overhead in Frequency Hopping communication systems. Generally, the method establishes a synchronization state during which a plurality of communications...
5414731 Command set and procedure for synchronization of frequency hopping control clocks  
A wireless Local Area Network (LAN), in which each wireless adapter includes a controller and a transceiver which are located a finite distance from each other. Each controller and transceiver has...
5408506 Distributed time synchronization system and method  
A distributed time synchronization system and method synchronizes nodes within a frequency hopping spread spectrum (FHSS) local area network (LAN) group to a virtual master clock value. Each node...
5386435 Frequency hopping spread spectrum data communications system  
A frequency hopping spread spectrum wireless data communications network is disclosed. Time mark frames are transmitted by each base station at a regular cadence and each time mark frame contains...
5381443 Method and apparatus for frequency hopping a signalling channel in a communication system  
A cellular communication system hops both signalling channels and traffics channels in a common hopping sequence. To obtain system information from the frequency hopping signalling channel, a...
5287384 Frequency hopping spread spectrum data communications system  
A frequency hopping spread spectrum wireless data communications network is disclosed. Time mark frames are transmitted by each base station at a regular cadence and each time mark frame contains...
5144668 Signal overlap detection in a communication system  
In frequency-hopping spread-spectrum systems, it is necessary to maintain frequency and bit synchronization (sync) between the transmitter and receiver in order to maintain quality data recovery at...
5121408 Synchronization for entry to a network in a frequency hopping communication system  
Synchronization of a frequency hopping transceiver to a network by embedding synchronization codes in the pseudo-random frequency hopping transmission sequence. A receiver is implemented with a...
5099495 Spread spectrum communication device  
In a spread spectrum communication device using a convolver as a correlator, the modulation-demodulation system is so constructed that characteristics peculiar to the convolver are utilized for the...
4912722 Self-synchronous spread spectrum transmitter/receiver  
The present invention relates to a self-synchronous spread spectrum transmitter and an associated remote spread spectrum receiver which communicate with each other by the transmission of both (1) a...
4868523 Intermittent phase locked loop frequency synthesizer for frequency hopping radio system  
A frequency synthesizing apparatus comprising a reference generator (1) and a phase locked loop containing a phase detector (3) of the sample-hold type, a loop filter (4) a VCO (5) and a frequency...
4850036 Radio communication system using synchronous frequency hopping transmissions  
A frequency-hopping radio communication system is disclosed comprising a control unit which transmits to and receives from each of a plurality of slave stations using a frequency-hopping mode of...
4837823 Communication system  
A frequency hopping communication system whose transmitters and receivers after synchronization hop over a frequency series of a first type. To synchronize the transmitters and receivers, sync data...
4776012 Method of jumping composite PN codes  
The present invention is concerned with an apparatus and a method of jumping a composite PN code from a current phase position to a desired predetermined phase position so as to enhance acquisition...
4752939 Hidden preamble for frequency hopped synchronization  
A method is provided for achieving initial synchronization of the transmission and reception of a frequency hopped communication signal, which comprises the steps of transmitting a preamble defined...
4704585 Rapid frequency synthesizer apparatus and method  
Rapid frequency synthesizer apparatus, particularly for use in high speed frequency hooping systems, includes a voltage controlled oscillator (VCO) and a memory in which are stored digital control...
4677617 Rapid frequency-hopping time synchronization  
A method is disclosed for synchronizing the operation of frequency hopping, spread spectrum communication devices in a network. One device (the "NTU") is deemed to be keeping the network time, to...
4653068 Frequency hopping data communication system  
A frequency hopping data communication system for a bidirectional communication system is described in which improved operation in a jamming and/or fading environment is provided. A pseudo-noise...
4606040 Transmitting-receiving station for a system for transmitting data by frequency hopping  
A transmitting-receiving station for transmitting information by frequency hopping comprises a code generator to define the use of a plurality of channels in accordance with a high-speed skip law...
4601043 Digital communications software control system  
There is disclosed a digital communication system which utilizes software control through a universal synchronous/asynchronous receiver transmitter for providing improved communications performance...
4583231 Method of, and apparatus for, frequency-hopped frequency-shift-keyed digital data communications  
A digital data communications method and system combining frequency agility with a frequency-shift-keyed signal to transmit a unique code word representing a plurality of data states. Each code...
4578816 Method of synchronization of transmitter-receiver stations of a frequency-jumping network and a station for the practical application of said method  
The method of synchronization enables a network of transmitter-receiver stations which communicate by frequency-jumping to establish communication links after silent periods of long duration in...
Matches 101 - 150 out of 155 < 1 2 3 4 >