85 results about "Carrier signal" patented technology

The invention relates methods for time aligning uplink transmissions by a mobile terminal in a mobile communication system, and to methods for performing a handover of a mobile terminal to a target aggregation access point. The invention is also providing apparatus and system for performing these methods, and computer readable media the instructions of which cause the apparatus and system to perform the methods described herein. In order to allow for aligning the timing of uplink transmissions on uplink component carriers, where different propagation delays are imposed on the transmissions on the uplink component carriers, the inventions suggests to time align the uplink component carriers based on a reference time alignment of a reference cell and a reception time difference or propagation delay difference between the downlink transmissions in the reference cell and the other radio cells, the uplink component carriers of which need to be time aligned.

The invention relates to a method and circuit for linearizing amplifiers and other nonlinear circuits for multi-carrier signals. An output signal from the amplifier is sampled, and a correlation matrix of size N×N is computed from the sampled signal, wherein N exceeds the number of multiplexed carriers in the signal. A signal-to-distortion ratio (SDR) is then estimated based on a ratio of one or more largest to one or more smallest eigenvalues of the correlation matrix, and the signal into the amplifier is pre-distorted so as to maximize the SDR.

Systems and methods for reliably communicating data at high data rates between surface and downhole equipment over a power cable by multiplexing data, modulating the data onto orthogonal carrier frequencies, communicating the modulated carrier signals over the power cable, recovering of the modulated signals, and demodulating the data stream from the recovered signal. One embodiment comprises a system that includes surface equipment connected by a power cable to an ESP system that has a gauge package connected to it. The gauge package uses a high-temperature DSP to perform the data processing associated with OFDM communications.

A method is provided for performing a clear channel assessment in a wireless network. The method involves first listening for channel energy on a wireless channel. Whatever channel energy is heard over the wireless channel is demodulated into non-synchronized in-phase and non-synchronized quadrature phase components. Each of the non-synchronized in-phase and non-synchronized quadrature phase components are squared, and then the non-synchronized in-phase component is multiplied by the non-synchronized quadrature phase component to produce an I−Q product. The sum of the squared non-synchronized in-phase component, the inverse of the squared non-synchronized quadrature component, and double the I−Q product is determined as a clear channel assessment input value. A carrier signal detection function is then performed on the clear channel assessment input value to produce a clear channel assessment output value, which is used to determine whether a signal is present in the wireless channel.

A network node, a wireless device and a respective method performed by the same in a wireless communication network employing heterogeneous frequency band types, the network node being operative to serve wireless devices in a non-licensed frequency band and in a licensed frequency band, the network node serving a wireless device in a non-licensed frequency band are provided. The method in the network node comprises configuring (110) a fallback carrier in the licensed frequency band to the wireless device, wherein if the network node determines that the wireless device should switch to the licensed frequency hand, the method comprises handing over (130) the wireless device to the fallback carrier.

The invention provides a method aiming at the overall consideration and complexity of an uplink in a synergetic OFDM (orthogonal frequency division multiplexing) system for the resource allocation in a synergetic OFDM system. The method is characterized in that relays with the number thereof being a positive integer are arranged between a subscriber and a base station and each relay is provided with a plurality of subcarriers with the number being identical with that of the relays. The method comprises the following steps: firstly, the base station selects a relay according to the minimum equivalent signal-to-noise ratios of the subcarriers in each relay, that is, the base station selects the relay with the maximal equivalent signal-to-noise ratio of the subcarriers from the relays with the minimal equivalent signal-to-noise ratio of the subcarriers as the relay node for the subsequent synergetic transmission; then, the selected relay sequences the subcarriers between the subscriber and the selected relay and between the subscriber and the base station sequentially pair the subcarriers, namely, the subcarriers of the relay with high signal-to-noise ratio are used for transmitting the data supposed to be transmitted by the subcarriers of the subscriber with high signal-to-noise ratio; and finally, the base station carries out the water-filling power allocation on each intra-subcarrier according to the equivalent channel gain of each subcarrier pair, and starts the synergetic transmission.

The embodiment of the invention relates to the technical field of wireless communication, in particular to a method, a system and equipment for scheduling, which are used for conducting span-carrier wave scheduling on overlapped subframes after using carrier wave aggregation with different TDD (time division duplex) uplink/downlink configuration. The method in the embodiment of the invention comprises the following steps: when network side equipment needs to carry out scheduling to user equipment using the carrier waves with different TDD uplink/downlink configuration to carry out aggregation, SIF (sound intermediate frequency) for scheduling the carrier waves with the configuration different from the TDD uplink/downlink configuration of the carrier waves is determined; the network side equipment transmits DCI (data communication interrogate) containing the SIF to a user terminal by bearing downlink subframes n in the carrier waves of downlink control information, wherein n is integral number not less than 0. In the invention, span-carrier wave scheduling can be carried out on the overlapped subframes aiming at the aggregated carrier waves with different TDD uplink/downlink configuration, and the system performance and the resource utilization rate can be improved.

Apparatus and method for communication are provided. The apparatus includes a controller for controlling the transmission and reception of data on one or more carriers utilizing Time Division Duplexing and frames including sub frames, where multiple carriers utilized by different apparatuses are synchronized with each other and a predetermined number of sub frames of each frame are reserved for predetermined transmission directions and a scheduler for allocating the rest of the sub frames carrier specifically either in downlink or uplink direction.

A transmitting unit divides a transmit data into a plurality of code blocks, and encodes each of the plurality of code blocks to generate a transmission signal. The transmitting unit transmits the transmission signal, and a receiving unit receives the transmission signal as a reception signal. The receiving unit receives performs an iterative decoding to each of the plurality of code blocks of the reception signal. The iterative decoding is terminated to a first code block group in which an error has not been detected before a first setting iteration count. The receiving unit, when being an error in the reception signal, transmits a retransmission request feedback data which contains a NACK data and a data indicating the first code block group to the transmitting unit. First resources are assigned for each of the plurality of code blocks of the transmission signal. The transmitting unit assigns resources of the first code block group of the plurality of code blocks of the transmission signal to second resources which are fewer than the first resources, based on the retransmission request feedback data, and retransmits the transmission signal to the receiving unit.

CSIT error considerate delay-sensitive user access systems are provided in a multi-user OFDMA environment comprises a user delay sensitivity tracking component, a CSIT estimating component, a system queue state tracking component and a cross layer scheduling component. The techniques assume heterogeneous users with respect to delay and assume that CSIT information includes error, and optimally allocates broadcast resources, e.g., power, subcarriers and data rate, based on such assumptions.

In a mobile communication system in which a plurality of component carriers are used, transmitting and receiving control information of HARQ effectively is realized. In a mobile communication system in which a base station apparatus (100) sets a plurality of downlink component carriers for a mobile station apparatus (200), the base station apparatus (100) transmits a downlink transport block to the mobile station apparatus (200) on one or a plurality of downlink component carriers among the plurality of downlink component carriers, and the mobile station apparatus transmits, to the base station apparatus (100), control information of HARQ for the downlink transport block on any one of physical uplink control channel resources corresponding to the one or plurality of downlink component carriers on which the downlink transport block has been transmitted.

The present invention relates to a method and apparatus for determining radio link failure between the UE and the eNB in a wireless communication system. Particularly, the present invention provides a method and apparatus for determining radio link failure efficiently in such a way that the UE measures the radio link quality of the anchor carrier, the radio link qualities of the aggregated carriers, and the radio link quality of neighbor cells in order, and determines whether the radio link quality fulfills a predetermined condition.

An embodiment of the invention discloses a method for transmitting uplink control information and a related device. The method for transmitting uplink control information and the related device are used for choosing channels to transmit the uplink control information at the scene that more than two program-controlled computers (PCC) exist on a carrier resource corresponding to user equipment (UE). The method includes: the UE receives uplink control channel simultaneous allowable parameters simultaneous physical uplink control channel-physical uplink control channel (PUCCH-PUCCH) sent by a base station, if the simultaneous PUCCH-PUCCH indicates yes, the uplink control information (UCI) required to be transmitted by each band is transmitted on a physical uplink control channel (PUCCH) carried by a main member carrier PPC of each band in a plurality of bands. In addition, the related device for achieving the method is further provided.

The present invention provides a system and method to permit the network management system to indirectly manage layer one telecommunication resources dedicated to a carrier virtual network from a dedicating telecommunication network. In each telecommunication network a business layer allows that telecommunication network's management system and the layer one resources in that network to exchange network information and network instructions. One or more communication layers transmits messages having a predetermined format, such as XML or ASCII text, between the telecommunication layer to a format useable by the network management system associated with the interpretation layer for use as network information or network instructions.

The invention provides a power line carrier communication terminal device which comprises a power line carrier power adapter system used for allowing a strong-current power supply to be subjected to voltage reduction processing for outputting a low-voltage power supply, a signal modulation-demodulation system used for modulating/demodulating signals, and a signal transmission device used for transmitting low-voltage power supply and power line carrier signal, wherein the power output interface of the power line carrier power adapter system is connected with the power input interface of the signal modulation-demodulation system through the signal transmission device, so as to supply low-voltage direct current supply; and the power line carrier signal transmission interface of the power line carrier power adapter system is connected with the power line carrier signal transmission interface of the signal modulation-demodulation system through the signal transmission device, so as to realize the power line carrier signal communication. The device provided by the invention solves the electric safety problem, has an integrally reduced size and brings convenience for integration.

The invention discloses the transmitting and receiving method for mobile digital multimedia broadcast physical layer signaling message. Wherein, the transmission method comprises: mapping the signaling message on the idle data sub-carrier or both the continual pilot frequency and idle data sub-carrier, and modulating former sub-carrier or both continual pilot frequency and sub-carrier in OFDM signal for transmitting. The receiving method comprises: receiving OFDM signal to demodulate the idle data sub-carrier or both the idle data sub-carrier and continual pilot frequency; hereby, obtaining the signaling message. This invention improves transmission efficiency, saves system resource, and reduces decoding complexity.

The invention provides a power line carrier modulation method, a demodulation method, a circuit and a chip. The modulation method comprises the following steps of: detecting narrow-band nongaussian noise frequency in a power line; selecting non-noise frequency from a preset carrier frequency band as modulation carrier frequency; generating a modulation carrier according to the modulation carrier frequency; modulating a digital signal to be modulated to the modulation carrier to generate a power line carrier signal. By using the modulation method, the narrow-band nongaussian noise frequency can be avoided, the change of noise environment of the power line can be adapted, and the quality of power line communication can be improved.

The present invention relates to a method for defining, in a TDD wireless communication system in which broadband is configured by means of carrier aggregation, transceiving timing for a data channel and a control channel when cross-carrier scheduling is implemented.

A method and device for wireless data transmission between a base station and one or more transponders, in which electromagnetic carrier waves are emitted by the base station and symbols are transmitted from a given transponder to the base station by modulation and backscattering of the electromagnetic carrier waves, wherein a change in a modulation state takes place synchronously with synchronization markers transmitted by the base station. A change in the modulation state is carried out by a transponder with a specifiable time delay that is relative to the synchronization markers.

The invention relates to a traction converter and control, fault processing and carrier phase shifting methods thereof. The traction converter comprises a first pre-charging loop and a second pre-charging loop that are connected with a secondary-side winding of the traction transformer respectively, a first four-quadrant rectifier module connected in series with the first pre-charging loop, a second four-quadrant rectifier module connected in series with the second pre-charging loop, an intermediate direct-current voltage loop with the input terminal connected with the output terminal of the first four-quadrant rectifier module and the output terminal of the second four-quadrant rectifier module, a first traction inverter module with the input terminal connected with the output terminal ofthe intermediate direct-current voltage loop, a second traction inverter module with the input terminal connected with the output terminal of the intermediate direct-current voltage loop, and an auxiliary inversion system with the input terminal connected with the output terminal of the intermediate direct-current voltage loop. According to the traction converter, the single four-quadrant rectifier module can work and the single traction inverter module can work; and the robustness is high, the fault rate is low, the size is reduced, and the cost is lowered.

The invention discloses a signal configuration method, an information processing method, and devices. The signal configuration method comprises the following steps: selecting a plurality of synchronous windows contained in a preset period of time to carry a synchronous signal; configuring a broadcast channel according to the preset constraint relationship between the synchronous signal and the broadcast channel; and sending a configured signal by means of periodic trigger or non-periodic trigger, wherein the configured signal includes at least one of the synchronous signal and the broadcast channel, and a complete process of signal transmission is completed in the preset period of time. Each synchronous window includes a plurality of successive symbols. The synchronous signal is carried by a plurality of subcarriers of each symbol. The transmission process of the synchronous signal is completed in the preset period of time.

The invention discloses a visible light communication based bridging system which comprises a plurality of LED optical access points. One LED optical access point is set to be in an optical access mode and connected with a network through broadband access equipment, and the rest LED optical access points are set to be in an optical bridging mode and connected with each other through a power line carrier bus and/or visible light to realize communication connection. By the visible light communication based bridging system in the technical scheme, a distributed system of visible light communication is formed through a bridging technique, coverage area and transmission rate of a visible light communication system are increased, typical safety and radiationless performance are given into play for different scenes, and flexibility and convenience of the whole network structure are improved greatly.

An infrastructure equipment transmitting/receiving data to/from one or more communications devices in a wireless communications network, includes a transmitter, receiver, and controller controlling the transmitter and receiver to provide a wireless access interface providing communications resources arranged in time divided units of a system bandwidth providing plural blocks of communications resources, and one or more narrowband carriers. Each carrier provides, within a carrier frequency bandwidth, communications resources for allocation to narrow band communications devices, the carrier bandwidth being less than and within the system bandwidth, signals being transmitted to the narrowband communications devices via the narrow band carriers with a first power. The controller controls the transmitter to transmit signals on a down-link of a narrowband carrier to a narrow-band communications device with an increased power, power of the signals being increased to a greater second power to reduce a time of communicating a high priority message.

The invention provides a monitoring system for a water injection state of each layer of a multi-layer water injection well. The system comprises a ground control main machine and a sleeve, wherein a carrier steel pipe cable, cable passing packers and multiple underground water distribution devices are arranged in an inner cavity of the sleeve; the multiple underground water distribution devices are connected with the carrier steel pipe cable and an oil pipe in the sleeve; each underground water distribution device is corresponding to one distribution stratum, and is used for acquiring injection state data of the corresponding distribution stratum in real time; the cable passing packers are connected with the oil pipe, and are packed at the two ends of each underground water distribution device, so that a sealed water injection cavity is formed at each place where an underground water distribution device is situated; the carrier steel pipe cable is used for transmitting the injection state data of each distribution stratum acquired by each underground water distribution device to the ground control main machine in real time; and the ground control main machine is used for storing the injection state data of each distribution stratum. The system can monitor the injection state data of the water injection well in real time for a long time, and prevents the scene monitoring.

A communications transmitter configured to reduce the average-to-minimum magnitude ratio (AMR) of a communications signal includes a symbol mapper, a pulse-shaping filter, an AMR reduction circuit, and a modulator. The symbol mapper operates to generate a sequence of symbols from a binary-source data stream containing a message to be transmitted, and the pulse-shaping filter generates a baseband signal based on the sequence of symbols. The AMR reduction circuit is configured to compare magnitudes of samples of the baseband signal to a time-varying low-magnitude threshold, and modify the baseband signal to produce a modified baseband signal having a reduced AMR if a sample of the baseband signal is determined to have a magnitude less than the time-varying low-magnitude threshold. Finally, the modulator operates to modulate a carrier signal based on the modulation information contained in the modified baseband signal.