Class / Patent application number | Description | Number of patent applications / Date published |
375134000 | Having specific code acquisition or tracking | 38 |
20080198902 | HOPPING STRUCTURE FOR CONTROL CHANNELS - Systems and methodologies are described that facilitate transmitting and receiving control data according to hopping patterns where the hopping patterns are defined based in part on bandwidth capabilities of a device transmitting the control data and bandwidth of the network on which the data is being transmitted. In this regard, devices having lower bandwidth capabilities than the network can hop within given frequency blocks reserved for control data assuming the blocks are no greater than the bandwidth of the device. Devices having greater or substantially equal bandwidth capabilities as the network can hop across disparate frequency blocks of the network reserved for control data as the device can handle substantially any hop in frequency. This preserves frequency diversity for control channels in multiple device types regardless of device bandwidth capabilities. | 08-21-2008 |
20080267259 | Apparatus and method for intelligent frequency-hopping discovery and synchronization - A process control system or other system includes multiple nodes that communicate using frequency-hopping patterns. Each node may operate using its own frequency-hopping pattern. Each node may also broadcast information identifying its frequency-hopping pattern to other nodes, such as any neighboring nodes. Each node may further. receive information identifying the frequency-hopping patterns of any neighboring nodes. The nodes may then operate in a non-synchronized manner and use the frequency-hopping patterns of neighboring nodes to communicate. For example, each node may use the identified frequency-hopping pattern of a neighboring node to synchronize with and communicate data to the neighboring node. In this way, the nodes need not maintain synchronization at all times during operation. Also, different nodes may use different frequency channels at the same time, helping to increase the bandwidth available for wireless communications. | 10-30-2008 |
20080279258 | WIRELESS COMMUNICATION SYSTEM AND FREQUENCY HOPPING METHOD THEREFOR, AND BASE STATION AND MOBILE STATION - In a wireless communication system, a control unit ( | 11-13-2008 |
20080285627 | Method for Synchronisation and Control in Wireless Communication Systems - Method and device making it possible to synchronize a master station and one or more subscriber stations in a wireless communications network, comprising at least one processor disposed at the level of each of the subscriber stations and suitable for calculating each subscriber's transmit time adjustment by taking account of the rate of variation of the satellite-subscriber path, a master station side processor suitable for measuring the loop error and a processor suitable for comparing the value of the error with a threshold value and as soon as the loop error value for a subscriber station is less than or equal to the threshold value, for giving said subscriber station permission to send its traffic. | 11-20-2008 |
20080298434 | Method and Arrangement for Frequency Hopping in Wireless Communication Systems with Carriers of Varying Bandwidth - The present invention relates to frequency hopping in wireless communication systems utilizing single-carriers with varying bandwidth. Frequency hopping is made possible by dividing the available bandwidth, associated to the available frequency spectrum, in a levelled structure, a bandwidth tree. By the use of a frequency hopping tree, which has the same structure as the bandwidth tree and wherein each leaf represent a hopping sequence, a frequency hopping scheme is determined. Orthogonality in-between the frequency hopping schemes for different users is ensured by letting a users hopping sequence value at a level n, be dependent on the hopping sequence value associated to the same branch structure on the adjacent level closer to the root of the tree, n−1, and an input sequence associated with the level n. | 12-04-2008 |
20090060002 | ADAPTIVE BANDWIDTH, MULTI-CHANNEL DIGITAL MODULATION - A wireless product for wireless communication is constructed for spread spectrum operation within a required channel bandwidth where an RF signal for transmission in the channel is divided into sub-channels, each of which is less than the minimum channel bandwidth permitted by FCC regulations in order to realize improved transmission characteristics and greater flexibility in transmission timing and synchronization. The wireless product includes a controller for controlling system operation. During operation, the RF signal portion is less than the minimum channel bandwidth required by said regulations thus dividing the channel bandwidth to form N sub-channels, and setting the bandwidth of the RF signal to be substantially equal to the sub-channel bandwidth. The RF signal portion being transmitted in each of the N sub-channels. | 03-05-2009 |
20090147829 | METHOD AND SYSTEM FOR DYNAMICALLY CHANGING AUDIO STREAM BIT RATE BASED ON CONDITION OF A BLUETOOTH.RTM. CONNECTION - A method for communication is disclosed and may include dynamically changing the bit-rate of an audio and/or video stream communicated over a Bluetooth connection based on conditions of the Bluetooth connection. A rate at which corresponding audio and/or video samples, for said audio and/or video stream, are encoded for communication via the Bluetooth connection, may be based on Bluetooth piconet event information. The bit-rate of the audio and/or video stream may be dynamically adjusting based on bandwidth of the Bluetooth connection. The bit-rate of the audio and/or video stream may be dynamically increased based on bandwidth of the Bluetooth connection. The bit-rate of the audio and/or video stream may be dynamically decreased based on bandwidth of the Bluetooth connection. The audio and/or video samples may be encoded utilizing a variable bit rate. | 06-11-2009 |
20090154528 | ADAPTIVE MULTI-CHANNEL INTEGRATED WIRELESS NETWORK SYSTEM ARCHITECTURE - An adaptive multi-channel architecture for a wireless network is provided. A frequency hopping sequence generator module is compliant with a frequency hopping spread spectrum (FHSS) communications protocol. The frequency hopping sequence generator module is capable of performing FHSS concurrently on a plurality of communications channels. A frequency replacement module is coupled to the frequency hopping sequence generator module. The frequency replacement module is configured to receive feedback data over a feedback channel and adaptively select a transmission channel from the plurality of communications channels using the feedback data. | 06-18-2009 |
20100014564 | CONFIGURABLE FREQUENCY HOPPING SYSTEM AND METHODS - Disclosed is a method, system and apparatus for providing a configurable frequency hopping system that will accord with FCC mandated FHSS schemes while allowing different sensor and keypads types to communicate to a control panel or network node in the 902-928 Mhz frequency band on a single transceiver. More specifically comprising a plurality of FHSS profiles are disclosed, including a plurality of channels, each said plurality of channels having a predetermined channel spacing, a predetermined data rate, a frequency range, and a predetermined transmission power; and a FHSS determining unit for selecting an individual FHSS profile from said plurality of FHSS profiles according to a data type. | 01-21-2010 |
20100034239 | Method For Fast Synchronization and Frequency Hop Sequence Detection in Wireless Sensor Networks - A method of synchronizing wireless devices includes establishing a recurring sequence of frequency channels at which the wireless devices are to communicate. The frequency channels are divided into a plurality of groups. Synchronization information is transmitted at a respective first frequency channel in each of the groups of frequency channels during a first sampling time period. One of the groups of frequency channels is selected. A wireless device is used to sample each of the frequency channels in the selected group during the first sampling time period. Non-synchronization information is transmitted after the first sampling time period. Synchronization information is transmitted at a next respective frequency channel in each of the groups of frequency channels during a next sampling time period. The next sampling time period occurs after the transmitting of the non-synchronization information. | 02-11-2010 |
20100046584 | METHOD AND APPARATUS FOR GENERATING A PERMUTATION FOR FORWARD LINK HOPPING IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for generating a permutation for forward link hopping is provided, comprising initializing permutation constants, determining a value for p such that i is less than 2 | 02-25-2010 |
20100046585 | Frequency Hopping Network with a Guaranteed Handoff Delay - A system and method for operating a communications system network, the method including operating an access point (AP) acting as a network controller in a frequency hopping network, the AP communicating with other communication devices of the network over m number of frequencies using a hopping sequence of at least some of the m number of frequencies and a dwell time d for the plurality of frequencies; and operating a communication device seeking to establish synchronized communication with other communication devices of the frequency hopping network without any cross-AP coordination, the communication device scanning all of the m number of frequencies using a scanning time s for each of the m number of frequencies; and, wherein the scanning time s is no greater than 1/m of the AP dwell time d. | 02-25-2010 |
20100074304 | Power Line Communication Using Frequency Hopping - Communications among multiple nodes via a shared power line medium are carried out by dividing the available frequency spectrum in the shared power line medium into plural non-overlapping channels. A first channel is assigned to a first group of nodes, and a second channel, different from the first channel, is assigned to a second group of nodes. Communications between the first group of nodes can occur simultaneously with communications between the second group of nodes via the shared power line medium. Time slots may be assigned for the communications between the first group of nodes that occurs simultaneously with the communications between the second group of nodes via the shared power line medium. The simultaneous communications between different groups of nodes via a shared power line medium may be implemented using a frequency-hopping spread spectrum technique. | 03-25-2010 |
20100183049 | RESOURCE SHARING - A method comprising: determining which of a first process and a second process uses a first resource, wherein the first process requires use of a first resource to produce a result and the second process competes with the first process for use of the first resource; and controlling the first process, when the second process uses the first resource, to produce a result without use of the first resource. | 07-22-2010 |
20100284439 | SIGNAL JAMMING AVOIDANCE METHOD FOR A FREQUENCY HOPPING COMMUNICATION SYSTEM - To avoid signal jamming, a method is provided for selecting a dwell channel on a receiver in a frequency hopping communication system. The method includes: measuring a noise level on channels over which a data signal is received at the receiver; selecting a dwell channel based on the estimated noise levels, where the dwell channel having the lowest noise level amongst a group of permissible channels over which to acquire a signal from a transmitter; and tuning the receiver to the selected dwell channel during a search state in which the receiver attempts to synchronize with a transmitter. | 11-11-2010 |
20120224608 | APPARATUS AND METHOD FOR PROVIDING FREQUENCY HOPPING SCHEME IN BROADCAST COMMUNICATION SYSTEM - An apparatus and a method for using a frequency hopping scheme in a broadcast communication system are provided. A method for transmitting a broadcast signal via at least two frequency bands by a transmission end device in the broadcast communication system includes determining a frequency hopping pattern for providing a broadcast service and transmitting the same; transmitting control information via a first frame after a frequency is changed according to the frequency hopping pattern; and transmitting broadcast data for the broadcast service via a frame transmitted after the first frame. | 09-06-2012 |
20130016757 | TIMING RE-SYNCHRONIZATION WITH REDUCED COMMUNICATION ENERGY IN FREQUENCY HOPPING COMMUNICATION NETWORKSAANM Hui; Jonathan W.AACI Foster CityAAST CAAACO USAAGP Hui; Jonathan W. Foster City CA USAANM Woo; Lik Chuen AlecAACI Union CityAAST CAAACO USAAGP Woo; Lik Chuen Alec Union City CA USAANM Hong; WeiAACI BerkeleyAAST CAAACO USAAGP Hong; Wei Berkeley CA US - In one embodiment, a battery-operated communication device “quick-samples” a frequency hopping sequence at a periodic rate corresponding to a substantially low duty cycle, and is discovered by (e.g., attached to) a main-powered communication device. During a scheduled sample, the main-powered communication device transmits a control packet to be received by the battery-operated communication device, the control packet containing timing information and transmitted to account for worst-case clock drift error between the two devices. The battery-operated communication device responds to the control packet with a link-layer acknowledgment containing timing information from the battery-operated communication device. Accordingly, the two devices may re-synchronize their timing based on the timing information in the control packet and acknowledgment, respectively. | 01-17-2013 |
20130016758 | OVERLAYING INDEPENDENT UNICAST FREQUENCY HOPPING SCHEDULES WITH A COMMON BROADCAST SCHEDULEAANM Hui; Jonathan W.AACI Foster CityAAST CAAACO USAAGP Hui; Jonathan W. Foster City CA USAANM Hong; WeiAACI BerkeleyAAST CAAACO USAAGP Hong; Wei Berkeley CA USAANM Woo; Lik Chuen AlecAACI Union CityAAST CAAACO USAAGP Woo; Lik Chuen Alec Union City CA US - In one embodiment, each device in a frequency hopping communication network independently determines its own local unicast listening schedule, and discovers a neighbor unicast listening schedule for each of its neighbors. The devices also synchronize to a common broadcast schedule for the network that simultaneously overlays a configured portion of all unicast listening schedules in the network. Accordingly, the device operate in a receive mode according to their local unicast listening schedule and the common broadcast schedule during the overlaid configured portion, and in a transmit mode according to each neighbor unicast listening schedule and the common broadcast schedule during the overlaid configured portion depending upon a destination of transmitted traffic. | 01-17-2013 |
20130022084 | DYNAMIC COMMON BROADCAST SCHEDULE PARAMETERS FOR OVERLAYING AN INDEPENDENT UNICAST SCHEDULE - In one embodiment, each device in a frequency hopping communication network operates according to a common broadcast schedule for the network that simultaneously overlays a configured portion of all independently determined unicast listening schedules in the network, wherein the overlaid configured portion is based on broadcast schedule parameters consisting of a first time spent for broadcast transmissions in each broadcast period and a second time between broadcast periods. By monitoring network characteristics relating to unicast traffic and broadcast traffic in the network, updated broadcast schedule parameters may then be determined based on the network characteristics. Operation of the common broadcast schedule may thus be updated with the updated broadcast schedule parameters, accordingly. | 01-24-2013 |
20130051430 | METHOD AND DEVICE FOR DETERMINING A SET OF FREQUENCIES THAT CAN BE USED FOR TRANSMITTING INFORMATION BETWEEN RADIO TRANSCEIVERS OF A NETWORK OPERATING WITH FREQUENCY HOPPING - The invention relates to a method for determining a set of frequencies that can be used in a frequency plane for transmitting information between at least two transceivers of a network operating with frequency hopping, which includes a step of initially determining an initial set of frequencies that can be used, each one of which has a magnitude lower than a threshold, at least one step ( | 02-28-2013 |
20130077654 | Method and Network for Data Transmission Between a Plurality of Radio Stations - This method for transmitting data between a plurality of radio stations of one same network, each station having a transmitter and a receiver, comprises: a first transmission mode in which the network operates with frequency hopping in a first frequency plan, the frequency used for data transmission being maintained for a FH dwell time, and changing from one FH dwell time to another as per a law of frequency change; a second transmission mode in a second frequency plan in which a transmitter station (A) transmits data on a fixed frequency to a receiver station (B), the second mode comprising a step ( | 03-28-2013 |
20130094537 | DYNAMIC HOPPING SEQUENCE COMPUTATION IN CHANNEL HOPPING COMMUNICATION NETWORKS - In one embodiment, a device in a channel hopping communication network independently maintains a slot counter, and computes a channel identification (ID) based on a function having inputs of i) a unique feature of the device, ii) a current slot of the slot counter, and iii) a set of possible channel IDs. Accordingly, the device configures its radio to receive on the computed channel ID for the respective current slot. In another embodiment, the device may determine, for a neighbor device, a current neighbor slot and unique neighbor feature, and correspondingly computes a neighbor channel ID based on the function using the unique neighbor feature, the current neighbor slot, and the set of possible channel IDs. As such, the device configures its radio to transmit on the computed neighbor channel ID for the respective current neighbor slot. | 04-18-2013 |
20130243039 | PILOT TRANSMISSION IN A WIRELESS COMMUNICATION SYSTEM - Techniques for transmitting pilot and traffic data are described. In one aspect, a terminal may scramble its pilot with a scrambling sequence generated based on a set of static and dynamic parameters. The static parameter(s) have fixed value for an entire communication session for the terminal The dynamic parameter(s) have variable value during the communication session. The terminal may generate a scrambling sequence by hashing the set of parameters to obtain a seed and initializing a pseudo-random number (PN) generator with the seed. The terminal may then generate the pilot based on the scrambling sequence. In another aspect, the terminal may use different scrambling sequences for pilot and traffic data. A first scrambling sequence may be generated based on a first set of parameters and used to generate the pilot. A second scrambling sequence may be generated based on a second set of parameters and used to scramble traffic data. | 09-19-2013 |
20130251000 | Synchronous Frequency Hopping Spread Spectrum Communications - Methods, systems and metering devices are provided for performing synchronous communication in a frequency hopping communication system without the use of expensive clock circuitry and/or significant amounts of data traffic on the communication system. | 09-26-2013 |
20130343431 | METHOD AND DEVICE FOR SEARCHING FOR NEIGHBORING BLUETOOTH DEVICES - A method and apparatus are disclosed for searching for a neighboring bluetooth device. The method includes: when searching out a neighboring bluetooth device, a bluetooth device initiating a searching operation judging whether the neighboring bluetooth device is a recorded bluetooth device in a bluetooth management database; if no, sending a name request command to the neighboring bluetooth device, and acquiring a name of the neighboring bluetooth device; or else, judging whether the name of the neighboring bluetooth device has ever been changed by a user according to a name management field carried in a Frequency Hop Synchronization (FHS) group of the neighboring bluetooth device; if the name has not ever been changed, acquiring a stored name of the neighboring bluetooth device from the bluetooth management database; if changed, sending the name request command to the neighboring bluetooth device, and acquiring the name of the neighboring bluetooth device. | 12-26-2013 |
20140036962 | SYNCHRONIZATION METHOD AND SYSTEM - A method of emission of a frequency synchronization signal comprises a first step of determining at least two first emission frequencies respectively associated with at least two first intervals separated temporally by a first duration. The first temporal intervals are of identical duration. The first durations are identical for identical first frequencies and the first durations are different for different first frequencies. The method also comprises a second step of emitting at least one synchronization signal in the first temporal intervals and by using the first frequency, the signal emitted in the first intervals being identical. | 02-06-2014 |
20140126610 | FAST FREQUENCY-HOPPING SCHEDULE RECOVERY - In one embodiment, a device determines a need to resynchronize a broadcast and unicast frequency-hopping schedules on its network interface. In response to the need, the device may solicit the broadcast schedule from one or more neighbor devices having the synchronized broadcast schedule, and then establishes the unicast schedule for the network interface using communication during the synchronized broadcast schedule. | 05-08-2014 |
20140146857 | Method for Setting Frequency Channels in a Multi-Hop Wireless Mesh Network - A method for setting frequency channels in a multi-hop wireless mesh network including a plurality of nodes. Each node hops on frequency channels, with a hop period, according to a frequency channels hopping sequence. All data packets transmitted by the nodes have a duration strictly longer than the hop period. When a given node of the plurality of nodes is in a first transmit mode in order to transmit a data packet, it carries out steps of: selecting a transmit frequency channel as a function of the frequency channels hopping sequence; and transmitting the data packet using, for the entire duration of the data packet, the selected transmit frequency channel. | 05-29-2014 |
20140204980 | LOCATION TRACKING MULTIPLE ACCESS PROTOCOL OF A BEACON - Systems, methods and apparatus are provided through which in some implementations a here-i-am (HIA) transmission on a first RF channel, a registration (REG) transmission on a second RF channel and a location tacking messaging (LOC) transmission on a third RF channel is operable to identify location between a network and beacons using a wireless communications channel that permits the beacons to be tracked by the network for location of the beacons. | 07-24-2014 |
20140219319 | SIGNAL PROCESSING METHOD, CONNECTOR, AND MEMORY STORAGE DEVICE - A signal processing method, a connector and a memory storage device are provided. The signal processing method is for the connector which does not include a crystal oscillator. The signal processing method includes: receiving a first signal stream from a host system; tracking a transmission frequency of the first signal stream, and obtaining a frequency shift quantity of the first signal stream relative to the transmission frequency; determining if a spread spectrum operation is performed on the first signal stream according to the frequency shift quantity to generate a determination result; generating a second signal stream according to the determination result and the transmission frequency. Accordingly, the spread spectrum operation is handled under the situation without a crystal oscillator. | 08-07-2014 |
20140269842 | LOW ENERGY SIGNALING SCHEME FOR BEACON FENCING APPLICATIONS - Systems, methods, and devices of the various embodiments provide modified frequency hopping patterns that enable synchronization of a wireless tracking device with a beacon signal that defines a predetermined area (i.e., beacon fence). In an embodiment, a beacon may transmit a beacon signal according to a modified frequency hopping pattern and a wireless tracking device may receive the beacon signal by tuning a receiver according to the frequency hopping pattern. In an embodiment, the modified frequency hopping pattern may include a reference frequency generated at a high redundancy pattern multiplexed with a pseudo random sequence of frequencies. In an embodiment, the packets of the beacon signal transmitted at the reference frequency may include an indication of the next frequency according to the modified frequency hopping pattern. | 09-18-2014 |
20150023395 | WIRELESS COMMUNICATION SYSTEM INCLUDING FREQUENCY HOPPING ELECTRONIC DEVICES, AND CONTROL METHOD AND STORAGE MEDIUM THEREFOR - A wireless communication system in which a master device and a slave device each performing wireless communication by a frequency hopping system can operate in synchronism with each other. In the master device, a master microcomputer outputs a first sync signal to a RTC unit after a transmission timing signal is received and a carrier frequency is changed a predetermined number of times according to a first change timing signal. In the slave device, a slave microcomputer outputs a second sync signal to a RTC unit after a reception timing signal is received and a carrier frequency is changed the predetermined number of times according to a second change timing signal. | 01-22-2015 |
20150071329 | METHOD AND APPARATUS FOR LATE ENTRY IN ASYNCHRONOUS FREQUENCY HOPPING SYSTEMS USING RANDOM PERMUTATION SEQUENCES - A wireless method and apparatus for late entry in frequency hopping systems that, during call setup, computes a random permutation sequence through a hop set of frequencies, chooses preamble frequencies to omit data thereon in lieu of preamble data, and swaps frequencies in the random permutation sequence such that synchronization frequencies lie next to the preamble frequencies with an expected delay such that late entrants can join. The wireless method and apparatus meets the FCC requirement of maintaining a pseudorandom hopping pattern and equal distribution of all frequencies in a hop set while guaranteeing late entry and having no effect on battery performance of radios. | 03-12-2015 |
20150326276 | FREQUENCY HOP SEQUENCE DISCOVERY MECHANISM - An apparatus including narrowband receivers and a controller. The narrowband receivers are deployed geographically within a grid, where each of the narrowband receivers is configured to receive transmissions from a least one of a plurality of automated meter reading (AMR) meters, and where each of the plurality of AMR meters transmits identical data on each of a plurality of frequency bands that are hopped according to an unknown hopping sequence, but a known hop rate. The controller is coupled to the narrowband receivers, and is configured to control the narrowband receivers such that the each of the plurality of AMR meters is identified, and is configured to control the narrowband receivers such that corresponding data from the each of the AMR meters is received on at least one of the plurality of frequency bands. | 11-12-2015 |
20150372716 | METHOD FOR SETTING FREQUENCY CHANNELS IN A MULTI-HOP WIRELESS MESH NETWORK - A method for setting frequency channels in a multi-hop wireless mesh network including a plurality of nodes. Each node hops on frequency channels, with a hop period, according to a frequency channels hopping sequence. All data packets transmitted by the nodes have a duration strictly longer than the hop period. When a given node of the plurality of nodes is in a first transmit mode in order to transmit a data packet, it carries out steps of: selecting a transmit frequency channel as a function of the frequency channels hopping sequence; and transmitting the data packet using, for the entire duration of the data packet, the selected transmit frequency channel. | 12-24-2015 |
20160072548 | Techniques for Generation of a Frequency Hopping Sequence - A device operated in a network using a channel hopping communication protocol may select a channel for each transmission by first generating and storing a sequence of pseudo-random index numbers. A list of good channels is selected from a plurality of channels. For each channel hop, one of the good channels is selected from the list of good channels for use by a transceiver in the device by using an index number selected from the sequence of pseudo-random index numbers. The list of good channels may be revised periodically and channels may be selected from the list of good channels for use by the transceiver without revising the sequence of pseudo-random index numbers. | 03-10-2016 |
20160080030 | FAST FREQUENCY-HOPPING SCHEDULE RECOVERY - In one embodiment, a device determines a need to resynchronize a broadcast and unicast frequency-hopping schedules on its network interface. In response to the need, the device may solicit the broadcast schedule from one or more neighbor devices having the synchronized broadcast schedule, and then establishes the unicast schedule for the network interface using communication during the synchronized broadcast schedule. | 03-17-2016 |
20160112090 | SYNCHRONOUS FREQUENCY HOPPING SPREAD SPECTRUM METHOD FOR MESH NETWORKS - Synchronous FHSS networks operating within mesh networks typically require a certain amount of network traffic to maintain time as well as for executing other functions, such as registration and neighbor discovery. The concepts presented in this disclosure provide a mesh network with enhanced communication capabilities without adding significant hardware or firmware costs to nodes within the network. The disclosed concept of using acquisition channels (frequencies) integrated within FHSS pseudo-random sequences speeds network responses to conditions like outage and restoration. Assignment of unique hop sequences by hop level or at time of manufacture can guarantee minimal network contention while minimizing system network traffic. | 04-21-2016 |