38results about "Frequency-division multiplex" patented technology

To provide a communication device and a communication signal generation method for adaptively performing power line communication using a cable capable of obtaining desired communication characteristics enough to respond to a user's request.SOLUTION: A communication device includes a selection unit that selects one mode from a plurality of modes that are defined in a predetermined frequency band used for communication with another communication device and define different numbers of channels, and selects a channel in the selected mode, and a communication unit that performs communication with the other communication device using the selected mode and channel. When the communication unit does not receive the control signal from the other communication device, the selection unit changes the channel used for communication.SELECTED DRAWING: Figure 5

To provide a terminal that can set an appropriate cyclic prefix (CP) according to the compression rate in the time domain using Faster-Than-Nyquist (FTN) or the like.SOLUTION: A terminal transmits and receives slots consisting of multiple symbols. The terminal sets the length of the cyclic prefix added to the symbol on the basis of the degree of compression of the symbol in the time domain.SELECTED DRAWING: Figure 7

The present application relates to filter device, multiplexer and communication device, provide the filter device of multi-band response with wide band and low loss passband, wide band stopband and narrow band and steep stopband. The filter (1) has: input and output terminal (100, 110);LC parallel resonant circuit (10) has inductor (L1) and capacitor (C1) connected in parallel with each other;And elastic wave series resonant circuit, have series arm resonator (s1, s2) connected in series with each other, LC parallel resonant circuit (10) and elastic wave series resonant circuit are connected in series between input and output terminal (100) and input and output terminal (110).

In a wireless communication system in which when connecting one terminal apparatus to a base station apparatus and another base station apparatus, the other base station apparatus selects a frequency band to be used for control channels transmitted from the terminal apparatus to the other base station apparatus from a plurality of frequency bands usable by the other base station apparatus, and notifies the terminal apparatus of the selected frequency band, the base station apparatus acquires, from the terminal apparatus, information about radio quality of a signal received from the other base station apparatus for at least one frequency band out of the plurality of frequency bands, extracts portion of frequency bands out of the plurality of frequency bands based on the acquired information about radio quality, and notifies the other base station apparatus of information representing the portion of frequency bands.

The embodiments of the present application provide a data transmission method, a communication device, and a communication system. The method includes: a baseband unit determines first data mapped to a first time unit from a first data stream of a first user, the number of symbols included in the first time unit is less than the number of symbols included in one slot, the first data is a part of the data in the first data stream, and the baseband unit transmits the first data to a radio frequency unit in a time window corresponding to the first time unit. In this solution, when the baseband unit transmits user data to the radio frequency unit, the user's data stream is divided in the time domain based on a time unit granularity, and a data amount of a single time unit granularity obtained by the division is transmitted each time, thereby reducing the data amount transmitted at one time. When a bit error or data loss occurs in the data transmitted at one time, the method can reduce the amount of data to be retransmitted and improve data transmission efficiency.

The first station (STA) receives a trigger frame from overlapping Basic Service Set (OBSS) access points (APs) that allocates a first distributed resource unit within the frequency channel bandwidth. The first STA transmits the data portion of the first physical layer protocol data unit (PPDU) through a second distributed resource unit within the frequency channel bandwidth that is not allocated by the trigger frame. In one embodiment, the second distributed resource unit is indicated in the user information field of the trigger frame.

An Electrical Vehicle (EV) charging station and communication network with redundancy protocol including a network server, a plurality of gateways with at least a first and second gateway, and a plurality of EV charging stations structured to be in WiFi communication with the plurality of gateways. First gateway, by default is the primary gateway and structured to be in cellular communication with the network server via first cellular communication provider. Second gateway by default is available as a charger, but in standby and structured to be in cellular communication with the network server via second cellular communication provider. The plurality of EV charging stations is structured to send and receive charging information via WiFi first gateway when it is the active primary gateway. They are structured to switch to second gateway when it has become the primary gateway due to communication failure of the first gateway with the network server.

A method of wireless communication performed by a base station includes grouping a plurality of wireless devices associated with a coverage area of the base station into multiple spatial groups, and configuring the wireless devices in each spatial group to use overlapping time-frequency transmission resources for uplink (UL) data transmissions to the base station. The method also includes scheduling, on a same set of time-frequency transmission resources, demodulation reference signal (DMRS) transmissions by the wireless devices in a respective spatial group of the multiple spatial groups. In various aspects, the multiple spatial groups are determined based on respective estimated angles of arrival of the plurality of wireless devices associated with the coverage area of the base station. In some instances, each of the wireless devices in the respective spatial group uses the same antenna ports as the other wireless devices in the respective spatial group for the DMRS transmissions.

A wireless communication system includes: a transmitter configured to transmit a carrier wave that is unmodulated; a plurality of passive terminals; and a receiver. Each of the plurality of passive terminals is configured to receive the carrier wave, superimpose a subcarrier of which frequency is determined in advance for each of the plurality of passive terminals on a backscatter of the carrier wave, modulate a signal generated by a signal source onto the subcarrier using a predetermined modulation scheme, and transmit the backscatter. The receiver is configured to receive multiple backscatters transmitted from the plurality of passive terminals, perform frequency conversion and orthogonal transformation on the multiple backscatters to generate a finite-length data series having an I component and a Q component, remove an interference component from the finite-length data series, and perform demodulation to acquire the signal of the signal source in each of the plurality of passive terminals.

To provide a radio communication system capable of suppressing reduction of communication quality caused by inter-channel interference and / or self-interference due to channel bonding.SOLUTION: A transmission apparatus 100 of a radio communication system 1 includes N pieces of transmission-side circuit devices 103g-n. The n-th transmission-side circuit device 103g-n acts on an n-th transmission signal from an n-th transmission-side band pass filter 103d-n. The n-th transmission-side circuit device 103g-n is an attenuator or amplifier having a wider operation bandwidth than a bandwidth of a channel bonding signal. A reception apparatus 200 of the radio communication system 1 includes N pieces of reception-side circuit devices 203g-n. The n-th reception-side circuit device 203g-n acts on an n-th reception signal from a distributor 203a. The n-th reception-side circuit device 203g-n is an attenuator or amplifier having a wider operation bandwidth than the bandwidth of the channel bonding signal.SELECTED DRAWING: Figure 10

An aggregation station: receives, from each of the base stations, communication path information with each of accommodated user terminals, for each user terminal; in a case where it is determined that the two of the base stations and the two user terminals are arranged on the straight line, generates first information for performing setting such that a transmission beam of any one of the base stations arranged on the straight line is stopped and another of the base stations non-orthogonally superimposes and multiplexes pieces of transmission data for the two respective user terminals with a predetermined power difference or power ratio; and controls the transmission beam of each of the two of the base stations arranged on the straight line on the basis of the first information.

To provide an information instruction method, specifically in the field of wireless fidelity technology.SOLUTION: The method includes an access point (AP) determining resource instruction information and transmitting the resource instruction information. The resource instruction information includes a plurality of bit sequences. A first bit sequence in the plurality of bit sequences corresponds to a first resource unit. The first resource unit is a resource unit in a resource block set that is allocated to a first station (STA) or a plurality of STAs. The resource block set includes at least two resource units. The method provided in an embodiment of the present application is used for two content channels to transmit HE-SIGNAL B in order to indicate that the plurality of resource units are allocated to one or more stations, for the purpose of reducing a signaling overhead.SELECTED DRAWING: Figure 13

The present invention is designed so that, even when communication is carried out by multiplexing a number of numerologies in the same carrier, it is still possible to communicate properly. A user terminal communicates in a radio communication system where frame structures of a plurality of numerologies are frequency-division-multiplexed, and has a receiving section that receives first information, which relates to a frame structure of a predetermined numerology, and second information, which specifies a period in which DL communication and / or UL communication are disallowed, or a period in which a specific communicating direction is configured, in the predetermined numerology, and a control section that controls DL receipt and / or UL transmission based on the first information and the second information.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.

The present invention is designed to allow communication based on appropriate numerologies even when multiple numerologies are used. According to one aspect of the present invention, a user terminal has a receiving section that monitors downlink control information by assuming a plurality of communication parameters that relate to a frequency domain and / or a time domain, and a control section that judges that at least part of parameters that relate to a search space for monitoring the downlink control information is different, for each of the communication parameters.

The invention discloses an MMF problem optimization method for a received signal SINR of an RIS-AFDM-NOMA system. The MMF problem optimization method comprises the following steps: constructing an uplink communication link of the RIS-AFDM-NOMA system; iDAFT is carried out on the DAFT domain signals of the K user terminals to generate transmission signals; the method comprises the following steps of: establishing a double-selectivity channel model, after a transmission signal passes through the channel, acquiring a total receiving signal by a receiving end, and performing DAFT conversion, matrix-vector form, sorting and SIC operation processing; and an MMF optimization problem of the UTk received signal SINR is constructed, and a power distribution coefficient, a precoding matrix and an RIS phase shift matrix are adjusted to carry out joint optimization solution. By the adoption of the method, on the basis of original signal enhancement and user rate improvement, parameter configuration during optimization of the multi-user SINR on the premise that fairness is met is obtained, and corresponding technical support is provided for AFDM communication in a 6G high mobility scene.

This disclosure relates to the field of oil and gas extraction technology, and in particular to a DC power line carrier communication method, apparatus, measurement and control equipment, and medium, which can solve the problems of synchronous transmission and reception in half-duplex communication and the complexity and redundancy of full-duplex schemes. The method includes selecting at least one of a first communication frequency band and a second communication frequency band to complete data transmission according to data transmission requirements, wherein the first and second communication frequency bands are mutually isolated; in the first communication frequency band, a first mixed signal is received, and a first carrier signal is isolated from the first mixed signal for parsing to obtain control commands; in the second communication frequency band, a second carrier signal characterizing downhole physical feature data is superimposed on the DC power supply base component and encoded to generate a second mixed signal for transmission. By achieving full-duplex communication through frequency division multiplexing, downhole equipment can simultaneously receive control commands and transmit monitoring data, solving the latency problem of half-duplex communication.

This application relates to the field of wireless communication technology and discloses a method and apparatus for transmitting encoded bits to improve the spectral resource utilization rate and data rate of a Wi-Fi system. [Solution] The method includes the following: The transmitting side performs channel coding on information bits according to the MCS used to generate coded bits, and distributes the coded bits to multiple channel sets or multiple resource units according to distribution rules. The receiving side receives the coded bits carried by multiple channel sets used for single-user preamble puncturing transmission or multiple resource units used for orthogonal frequency division multiple access OFDMA transmission according to reception and coupling rules, and performs channel decoding on the coded bits according to the modulation and coding scheme MCS used to generate information bits. The MCS is an MCS used for each of the multiple channel sets or an MCS used for each of the multiple resource units.

To appropriately configure an SUL (Supplemental UpLink) carrier when the SUL carrier is used, a user terminal according to one aspect of the present invention is a user terminal that performs communication by using a first carrier on which at least DL transmission is performed and a second carrier on which only UL transmission is performed. The user terminal includes a receiving section that receives certain downlink control information transmitted from the first carrier, and a control section that controls UL signal transmission on the second carrier, based on the certain downlink control information. The certain downlink control information is one of a downlink control information transmitted on a certain condition without a carrier indicator field (CIF), and a downlink control information including a CIF configured independently of a CIF of downlink control information used for notification of at least DL allocation.

The application provides a communication signal data processing scheduling system, method and electronic equipment, wherein the system comprises: a data receiving and preprocessing subsystem which performs preprocessing operation on original data to obtain preprocessing products and metadata comprising signal type information of the original data; a task planning management subsystem which is used for determining a task plan associated with the original data; and a signal processing subsystem which adaptively triggers a special communication signal processing flow corresponding to the signal type information according to the task plan and the signal type information in the metadata, and processes the preprocessing products to obtain signal processing products. The system introduces an adaptive triggering mechanism based on signal type information, realizes accurate on-demand calling of processing flows, effectively avoids occupation of redundant computing resources for unknown signal types, significantly improves system resource utilization, and guarantees processing capacity and user experience of the system in high-concurrency or resource-limited scenarios.

To provide a system and method for communicating an orthogonal frequency division multiplexing (OFDM) frame format.SOLUTION: An Orthogonal Frequency Division Multiple Access (OFDMA) frame communicated over a 20 MegaHertz (MHz) channel may include eight 26-tone resource units (RUs), one 26-tone bifurcated RU, and a direct current (DC) region. The eight 26-tone RUs may include twenty-six consecutive data and pilot tones, and the bifurcated 26-tone RU may be split into two 13-tone portions each of which includes thirteen consecutive data and pilot tones. The DC region may include seven null tones. In one example, the DC region of the 20 MHz MU-OFDMA frame consists of three DC tones and four null-data tones.SELECTED DRAWING: Figure 3A

A communication apparatus includes: a communication unit configured to perform communication with a terrestrial apparatus by FD (Full Duplex) in a service link or a feeder link of a non-terrestrial network; and a control unit configured to remove a self-interference that is an interference to a reception signal by a transmission signal.

A communication device is disclosed that includes a transmission unit that transmits a signal by adding a cyclic prefix to a symbol and a control unit that sets a length of the cyclic prefix longer when the symbol is compressed in a time domain. In other aspects, a communication method is also disclosed.

To provide a system for providing duplicate mode orthogonal frequency-division multiple access transmissions while maintaining a relatively low peak-to-average power ratio.SOLUTION: In a system for transmitting long range communication by sending duplicate symbol transmissions using a number of resource units, data to be transmitted is converted into symbols which are duplicated over a number of resource units. Phase shifts are applied to a number of symbols prior to conversion to the time domain for transmission. The phase shifts can be removed at a receiver prior to decoding the signal to the transmitted data.SELECTED DRAWING: None

To enable simultaneous wireless transmission of information and power without using a special configuration for a power reception-side device.SOLUTION: For example, an electronic apparatus includes: a plurality of antennas 11; a transmitter 13 capable of transmitting, from the plurality of antennas 11, a first radio wave with a beam directed in a first direction and a second radio wave with a beam directed in a second direction different from the first direction; and a controller 16 that controls a transmission weight of the first radio wave so that a null is directed in the second direction.SELECTED DRAWING: Figure 2

To facilitate the establishment of frame synchronization between channels.SOLUTION: A transmitting device includes first and second sub-frame generation units that generate first and second sub-frames based on first and second data signals, respectively, a first frame configuration unit that outputs the first or second sub-frame to a first physical channel, a second frame configuration unit that outputs the second sub-frame to a second physical channel, and an adjustment unit that adjusts the operation of the second sub-frame generation unit. The first frame configuration unit outputs an input signal to the first physical channel while switching a signal input destination between the first and second sub-frame generation units at a predetermined timing, and the second frame configuration unit outputs a signal based on the second sub-frame to the second physical channel, and the adjustment unit adjusts the operation of the second sub-frame generation unit so that the frame length of the signal output to the second physical channel is the same as the frame length of the signal output to the first physical channel.SELECTED DRAWING: Figure 2

Time synchronization between communication devices may be necessary for proper communications. The time synchronization may include determining a first target Session Management Function of a first terminal based on first target Single Network Slice Selection Assistance Information, a first target Data Network Name, first identity information, and first type indication information of a first time-sensitive network grandmaster clock by using a Network Repository Function. A first target label information may be obtained from a Unified Data Manager based on the first target Single Network Slice Selection Assistance Information, the first target Data Network Name, the first identity information, and the first type indication information of the first time-sensitive network grandmaster clock.

A method and apparatus for setting limited RUs and MRUs in a wireless LAN system are proposed. [Solution] The receiving STA receives the PPDU from the transmitting STA via a pre-configured frequency band and decodes the PPDU. The receiving STA is an STA that operates only in the 20MHz band. The PPDU includes a preamble and a data field. The data field is received in the pre-configured frequency band, excluding the first RU and first MRU resources.

A method for synchronizing baseband clocks in an OFDMA wireless microphone system is disclosed. An exemplary method includes receiving a plurality of pilot subcarriers from an audio transmitter. The method also includes determining a timing offset estimate based on the pilot subcarriers. The method further includes determining a tuning value by passing the timing offset estimate through a proportional-integral controller. The method further includes determining a modified reference signal by modifying a reference oscillator based on the tuning value. The method further includes controlling (i) an audio sample clock and (ii) an antenna data clock based on the modified reference signal.