Abstract: A transmission interface between at least a first module and a second module is proposed. The transmission interface includes at least two physical transmission mediums. Each physical transmission medium is arranged to carry a multiplexed signal in which at least two signals are integrated. The at least two physical transmission mediums include a first physical transmission medium arranged to carry a first multiplexed signal including a first IF signal and a reference clock signal. The first IF signal and the reference clock signal are at different frequencies.

Abstract: A method and communications apparatus to help improve time-frequency resource utilization. The method includes generating, based on a first non-orthogonal access parameter, a signal that carries uplink data, where the signal that carries the uplink data occupies a first time-frequency resource, generating, based on a second non-orthogonal access parameter, a signal that carries uplink control information, where the signal that carries the uplink control information occupies a second time-frequency resource, the first time-frequency resource overlaps the second time-frequency resource, and the first non-orthogonal access parameter is different from the second non-orthogonal access parameter, and sending the signal that carries the uplink data and the signal that carries the uplink control information.

Abstract: An independent cart system with safety functions prevents unintended motion independently within different sections of the track while permitting motion along other sections of the track. A safety controller receives one or more input signals corresponding to operating conditions along the track. A safety program executing in the safety controller monitors the state of the input signals to determine whether a safety function is to be executed. When a safety program is executed, the safety controller transmits an output signal to one or more segment controllers present in one section along the track. Each segment controller is responsible for regulating current flow to the coils mounted to the corresponding track segment. In response to the signal from the safety controller, each segment controller in the section controls the power output to the coils along that section of track to achieve the safe operation desired in that segment.

Abstract: Disclosed are techniques for wireless communication. In an aspect, a base station receives one or more signals indicative of a downlink compensation capability (e.g., an in-band capability to compensate for non-linear distortion, or an out-of-band capability to compensate for other FDM'd signal(s) to other UE(s), etc.) of at least one UE. The base station determines a set of downlink transmission requirements based on the downlink compensation capability of the at least one UE, and transmits data to the at least one UE in accordance with the set of downlink transmission requirements.

Abstract: It is aimed to provide a power supply device and a power supply system which enable consumers to freely choose electrical power and specify transmission sources when receiving electrical power, and enable parties involved in transactions (power supply side and power receiving side) to reliably and safely perform transmission between them. There are provided a power supply device and a power supply system. The power supply device includes a baseband unit that generates a power signal, a modulation processing unit that modulates the power signal generated by the baseband unit to impart a code thereto for specifying a transmission source of the power signal and generates a modulated signal that can be demodulated by a power receiving device, and a transmission unit that transmits the modulated signal generated by the modulation processing unit.

Abstract: An electric filtering device (200) for filtering Repetitive Electrical Impulse Noise (REIN) in a fixed-access telecommunications network (100), the electric filtering device comprising: a REIN filter (210), said REIN filter comprising a first electrical contact (220-1) and a second electrical contact (220-2) for connecting to a telecommunications cable (140) of the fixed-access telecommunications network; an enclosure (230) for enclosing the REIN filter; an input (250-1) and an output (250-2), formed as part of the enclosure, each for receiving a telecommunications cable (140) so as to be connected to the first and the second electrical contacts, thereby to connect the REIN filter to the fixed-access telecommunications network; a coupling formation (260) for coupling the electric filtering device to an external distribution point (130) for a telecommunications cable of the fixed-access telecommunications network.

Abstract: A method and network node for classification of interference connections between Citizens Broadband Radio Service Devices, CBSDs, in a wireless communication network are provided. According to one aspect, a method includes calculating an interference level, the calculation being based on whether two interfering CBSDs are operating in one of the alternate channels, adjacent channels and the same channel. The method also includes comparing the calculated interference level to a threshold to determine a classification of an interference connection.

Abstract: Apparatus and method for communication in non-terrestrial networks are disclosed. A set of Doppler shift curves for different distances to one or more satellite orbits is obtained. Measurements of satellite transmission are performed to obtain estimate of instantaneous Doppler shift of the transmission, the measurements including a timestamp. A Doppler shift curve corresponding to the measurements is calculated. A time offset on the selected curve is determined utilising the timestamps of the measurements, the time offset indicating the position of the Doppler shift of the apparatus on the curve. The Doppler shift of the satellite transmission is determined utilising the selected curve and the time offset.

Abstract: Performing distributed Remote PHY scheduling operations. A low latency scheduler is disposed within or in proximity to a Remote PHY node. Upon identifying that a particular data flow qualifies for processing by the low latency scheduler, the low latency scheduler performs upstream Remote PHY scheduling operations for the particular data flow using a one or more dedicated channels that are designated as low latency channels. The Remote PHY upstream scheduling operations define when data may be transmitted by a Cable Modem (CM) to a Converged Cable Access Platform (CCAP) Core. A centralized scheduler is also located at the CCAP Core. The centralized scheduler performs Remote PHY upstream scheduling operations for all data flows which have not been identified as qualifying for processing by the low latency scheduler.

Abstract: A rate Detection Apparatus (RDA) includes a power spectral density (PSD) estimator and a rate selector. The PSD estimator is configured to receive samples of a signal, and to estimate a PSD of the signal. The rate selector is configured to identify a transmission rate of the signal responsively to the estimated PSD.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for visibility filtering. One of the methods includes receiving a request for particular data on a social messaging platform; passing the request to one or more services, wherein each service is configured to call to data sources or to additional services to collect the particular data according to a request path defined for a type of request; performing visibility filtering at each service upon obtaining responses to calls made by that service, wherein performing visibility filtering at a service comprises calling a local visibility library that evaluates one or more rules with respect to the obtained response data, and wherein the results of the visibility filtering are passed upstream along the request path until a last service obtains all filtered response data; and assembling a final response to the request based on the filtered response data.

Abstract: Methods, systems, and devices for wireless communications are described. Some methods include receiving an indication of a traffic flow to be served by a wireless communication system, determining scheduling information for the traffic flow based on the indication, wherein the scheduling information comprises one or more of a time offset, a reliability, and a minimum throughput of delivery of data traffic for the flow, and transmitting the scheduling information in response to the indication. Some methods include determining delta time offset information relative to one or more existing time offsets of packet arrivals of one or more traffic flows for scheduling transmissions of a first traffic flow in the wireless communication system, and transmitting the delta time offset information to a node of the first traffic flow for scheduling transmissions of the first traffic flow in the wireless communication system. Other aspects and features are also claimed and described.

Abstract: Described herein are techniques for performing cell reselection in a wireless transmit/receive unit (WTRU). The method includes receiving a radio network terminal identifier (RNTI) from a first cell, transitioning from a connected state, performing cell reselection and to select a second cell different than the first cell, initiating resumption of communication by transmitting the RNTI to the second cell and resuming communications based on the transmitted RNTI.

Abstract: An electronic device and a communication method. The electronic device comprises: a processing circuit, configured to: determine transmitting signals simultaneously to at least two user devices and proximity of directions of downlink transmission signals for the at least two user devices satisfying a predetermined condition; and acquire, an amount of antenna elements to be activated for downlink beamforming, which is determined based on the directions of downlink transmission signals for the at least two user devices.

Abstract: Embodiments of the present disclosure relate to methods, apparatuses and computer program products for signal detection in a wireless communication system. A method implemented at a receiver device includes obtaining a set of received signals; determining a channel on which the set of received signals are transported; and detecting a set of transmitted signals from the set of received signals in an iterative manner based on the determined channel, a modulation mode for the set of transmitted signals, and the set of received signals, by using a gradient descent (GD) algorithm. Embodiments of the present disclosure may reduce computation complexity required in signal detection and/or improve detection performance.

Abstract: A system for securing a secret word during a read of the secret word from a read-only memory (ROM) is disclosed. The system includes a memory controller coupled to the ROM and a random number generator coupled to the memory controller. The random number generator is configured to generate a random number. The system further includes a number shuffler coupled to the random number generator and the memory controller. The number shuffler is configured to generate a bit read order based on the random number and the memory controller is configured to read bits of the secret word from the ROM according to the bit read order.

Abstract: A system and methods for transmission and non-coherent detection of data signals modulated by a plurality of overlapping chirps in a chirp spread spectrum communication system (CSS). Data signals input to an adaptive overlapping transmitter are modulated by a plurality of overlapping chirps and transmitted over a wireless communication system to a non-coherent receiver. The coherent receiver includes a chirp matched filter which matches the chirps to an internal chirp signal, a delay filter which delays each chirp, a multiplier which multiplies each delayed chirp by a next chirp, an integrator which sums the amplitudes of the chirps and decision circuitry which determines the polarity of each sum and outputs a stream of ones and zeroes representing the data signals.

Abstract: A method and an apparatus is provided for transmitting uplink data on uplink resources. The method and apparatus includes receiving a radio resource control (RRC) message indicating uplink resources for wireless transmit/receive unit (WTRU) and medium access control (MAC) timer information, transmitting uplink data based on the indicated uplink resources, and deactivating the indicated uplink resources in response to a MAC timer expiring, wherein the MAC timer is configured based on the MAC timer information.

Abstract: Compressive sensing (CS) channel recovery using history measurements. Both current and history measurements for AoAs estimation, and only use current measurement for coefficient estimation. The dominant angle of arrival (AoA) is estimated using history and current measurements. In Approach 1, the dominant AoA is invariant and the coefficients are uncorrelated. In Approach 2, the dominant AoA is invariant and the coefficients are fully correlated. The remaining AoAs are estimated. The coefficients corresponding to each estimated dominant AoA are estimated. And the channel is recovered.

Abstract: A backhaul radio is disclosed that operates in multipath propagation environments such as obstructed LOS conditions with uncoordinated interference sources in the same operating band. Such a backhaul radio may use adaptive beamforming and sample alignment at the transmitter to enhance the link performance. Such backhaul radios may communicate with each other to compute and apply optimal beamforming parameters for a particular propagation environment through a closed-loop feedback mechanism.

Abstract: A system and methods for transmission and non-coherent detection of data signals modulated by a plurality of overlapping chirps in a chirp spread spectrum communication system (CSS). Data signals input to an adaptive overlapping transmitter are modulated by a plurality of overlapping chirps and transmitted over a wireless communication system to a non-coherent receiver. The coherent receiver includes a chirp matched filter which matches the chirps to an internal chirp signal, a delay filter which delays each chirp, a multiplier which multiplies each delayed chirp by a next chirp, an integrator which sums the amplitudes of the chirps and decision circuitry which determines the polarity of each sum and outputs a stream of ones and zeroes representing the data signals.

Abstract: A system for securing a secret word during a read of the secret word from a read-only memory (ROM) is disclosed. The system includes a memory controller coupled to the ROM and a random number generator coupled to the memory controller. The random number generator is configured to generate a random number. The system further includes a number shuffler coupled to the random number generator and the memory controller. The number shuffler is configured to generate a bit read order based on the random number and the memory controller is configured to read bits of the secret word from the ROM according to the bit read order.

Abstract: Embodiments include methods and apparatus for wireless network communication between a device that operates a radio in compliance with a wireless communication standard and another device that may not be capable of complying with the wireless communication standard. In an embodiment a sender of a wireless standard compliant message modulates backchannel data on a wireless standard compliant message. The wireless standard compliant message may be addressed to an IP address of a compliant device. However the compliant message may have no meaning for the addressee. A noncompliant device within wireless range of the compliant message receives the message and demodulates the backchannel information. The noncompliant device this does not require a wireless standard radio to be on in order to receive messages and can operate at very low power.

Abstract: The present disclosure provides methods and apparatuses for transmitting and obtaining uplink HARQ feedbacks. The method of transmitting uplink HARQ feedbacks includes: an ordered service priority list associated with downlink subframes are obtained; based on the ordered service priority list, one or more groups of to-be-sent HARQ feedbacks are obtained by multiplexing HARQ feedbacks associated with the downlink subframes in a descending order of service priorities; an uplink subframe is assigned successively to each of the one or more groups of the to-be-sent HARQ feedbacks so to transmit the to-be-sent HARQ feedbacks to a base station.

Abstract: An information transmission method and device, capable of transmitting reference signal and data by using different sub-carrier intervals, are provided. The method includes: a first transmitting end transmits, on a first symbol in a first time-frequency region, a first signal by using a first sub-carrier interval, the first signal being a reference signal; the first transmitting end transmits, on a second symbol in the first time-frequency region, a second signal by using a second sub-carrier interval, the second signal being a data signal or control signal, wherein the first sub-carrier interval is different from the second sub-carrier interval, and the size of the first time-frequency region is the size of the minimum time-frequency scheduling unit of the data signal.

Abstract: A method for reading data stored in a flash memory. The flash memory comprises a plurality of memory cells and each memory cell has a particular threshold voltage. The method includes: obtaining a first threshold voltage distribution representing threshold voltages of a first group of the memory cells; obtaining a second threshold voltage distribution representing threshold voltages of a second group of the memory cells, wherein the second threshold voltage distribution is different from the first threshold voltage distribution, and the first group of the memory cells comprises at least a part of the second group of the memory cells; and controlling the flash memory to perform at least one read operation upon the first group of the memory cells according to the second threshold voltage distribution.

Abstract: This application discloses a dynamic time adjustment method, apparatus, and system, and pertains to the field of network communications. The method includes: determining a length of a new downstream transmission duration; updating lengths of upstream and downstream transmission durations based on the determined length of the new downstream transmission duration; and keeping silent or sending an idle symbol or another symbol with known content in a transition zone until all user-side devices complete updating of the lengths of the upstream and downstream transmission durations, where the transition zone is an additional zone of the new downstream transmission duration compared with a currently used downstream transmission duration, or an additional zone of a new upstream transmission duration compared with a currently used upstream transmission duration.

Abstract: Disclosed is a method and corresponding devices and computer programs for determining antenna weights for transmissions with punctured signals. The method comprises extracting, from a signal reception model for signals transmitted by at least two communication units, at least one of the communication units transmitting with punctured signals, a signal orthogonality loss quantity introduced by the punctured signals. The method also comprises calculating, based on the extracted signal orthogonality loss quantity, a covariance matrix quantifying the signal orthogonality loss between signals transmitted by the at least two communication units. The method also comprises determining, based on the covariance matrix, antenna weights for data symbols in the signals.

Abstract: A communication system receives a jammed signal including a sequence of complex numbers encoding one or combination of symbols transmitted by multiple transmitters. The system transforms the sequence of complex numbers into an image of real numbers having at least two columns and multiple rows, with real values of real and imaginary parts of each complex number forming different columns but the same row of the first image, processes the image with a neural network trained to suppress the wideband signal in the received signal, and detects the symbols transmitted by the transmitters from the de-jammed signal.

Abstract: A wireless device includes a digital receiver configured to receive data via an antenna array, and to determine a load metric based on a load of subcarriers around reference subcarrier signals of a reference signal, and a controller configured to compare the load metric to a load threshold to determine whether the load of the subcarriers is less than a predefined level, and if the load of the subcarriers is less than the predefined level, identify at least one time point where the reference signal repeats itself during a symbol period, and control the antenna array to switch among the plurality of antenna beamforming patterns based on the at least one time point.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for visibility filtering. One of the methods includes receiving a request for particular data on a social messaging platform; passing the request to one or more services, wherein each service is configured to call to data sources or to additional services to collect the particular data according to a request path defined for a type of request; performing visibility filtering at each service upon obtaining responses to calls made by that service, wherein performing visibility filtering at a service comprises calling a local visibility library that evaluates one or more rules with respect to the obtained response data, and wherein the results of the visibility filtering are passed upstream along the request path until a last service obtains all filtered response data; and assembling a final response to the request based on the filtered response data.

Abstract: A system and methods for transmission and non-coherent detection of data signals modulated by a plurality of overlapping chirps in a chirp spread spectrum communication system (CSS). Data signals input to an adaptive overlapping transmitter are modulated by a plurality of overlapping chirps and transmitted over a wireless communication system to a non-coherent receiver. The coherent receiver includes a chirp matched filter which matches the chirps to an internal chirp signal, a delay filter which delays each chirp, a multiplier which multiplies each delayed chirp by a next chirp, an integrator which sums the amplitudes of the chirps and decision circuitry which determines the polarity of each sum and outputs a stream of ones and zeroes representing the data signals.

Abstract: Techniques for employing precise transmission capabilities of a physical (PHY) layer to transmit time-synchronization beacons at an edge-of-field-resolution increment of a field of MAC layer frame. In some examples, the PHY layer may transmit beacons with a greater precision than permitted by lower-resolution MAC layer header fields. The communication protocol may specify the size of the field that is populated with timing information at a first precision. However, the PHY layer may be capable of transmitting with a second precision that is greater than the first precision. Thus, to virtually increase the time-synchronization resolution of the beacons, the beacons may be transmitted by the PHY layer at an edge-of-field resolution of the MAC layer header field. In this way, the first precision of the timing information in the MAC layer header field is virtually increased to the second precision of the PHY layer.

Abstract: The present disclosure provides an orthogonal codes based code division multiplexing method of performing the code division multiplexing of demodulation reference signals in multiple layers of resource blocks by using orthogonal matrices, the method comprising: changing the order of chips in particular rows of a first orthogonal matrix to obtain a second orthogonal matrix with the changed order of chips; and multiplying the chips in respective rows of the second orthogonal matrix by the demodulation reference signals in corresponding layers of resource blocks correspondingly in the time direction to obtain code division multiplexing signals. The technical scheme of the present disclosure can improve the power jitter situation of downlink signals on the time, thereby the usage efficiency of the power amplifier at the base station side can be improved.

Abstract: A transmission device includes: a first mapper that maps a first bit stream of a first data series to generate a first modulated symbol stream of the first data series; a second mapper that maps a second bit stream of a second data series to generate a second modulated symbol stream of the second data series; a converter that subjects the second modulated symbol stream to conversion in accordance with the first modulated symbol stream; a superposition unit that superposes the first modulated symbol stream and the second modulated symbol stream at a predetermined amplitude ratio to generate a multiplexed signal, the second modulated symbol stream having been subjected to the conversion in accordance with the first modulated symbol stream; and a transmitter that transmits the multiplexed signal.

Abstract: Systems, methods, and apparatuses for synthesizing a wireless communication signal are provided. A base expanded matrix is generated, wherein a sum of values in each row of the base expanded matrix produces a base signal vector. Values in at least one column of the base expanded matrix are updated to produce an updated expanded matrix. The values in each row of the updated expanded matrix are summed to produce an updated signal vector. The updated signal vector is transmitted over a wireless channel.

Abstract: The present disclosure relates to a method and apparatus for beamformed transmission in a wireless local area network. According to one aspect of the present disclosure, a method for transmitting a Physical layer Protocol Data Unit (PPDU) frame to a plurality of stations (STAs) by an Access Point (AP) in a wireless local area network may be provided. The method may include transmitting a SIGNAL field of the PPDU frame, the SIGNAL field including beamforming information indicating whether beamforming is applied to respective data units of the PPDU frame, and transmitting the data units of the PPDU frame, the data units being individually beamformed or not beamformed according to the beamforming information.

Abstract: A servo control system for controlling a plurality of axes of a machine tool, comprises: a plurality of servo control units for controlling the plurality of axes, respectively; a plurality of learning control units that are provided one each in the plurality of servo control units, and each configured to control a cyclic operation highly precisely; a common learning memory for storing correction data which at least a portion of the plurality of learning control units generates; a memory allocation unit for allocating at least a portion of a memory area in the learning memory to the axis that the learning control unit that generated the correction data controls; and a memory amount notifying unit for notifying the memory allocation unit as to the amount of memory that each of the plurality of learning control units of the respective axes requires.

Abstract: An Orthogonal Frequency Division Multiplexing (OFDM) transmitter generates OFDM multiple-access signals with low Peak-to-Average-Power Ratio (PAPR). A code-division multiplexer arranges original data symbols from different data streams inside each length-N symbol block, which is spread by a Discrete Fourier Transform (DFT) spreader. The arrangement of the original data symbols configures the DFT spreader to spread each original data symbol into a predetermined spread-DFT code division multiple access channel. The resulting DFT-spread data symbols are mapped to OFDM subcarriers, and an inverse discrete Fourier transform (IDFT) operates on the DFT-spread data symbols to generate an OFDM transmission signal having low PAPR.

Abstract: A distributed database transaction processing method and device based on a GPS atomic clock, the method includes: receiving a plurality of transaction requests by the first node server; determining a concurrency conflict between transaction requests received by the first node server; obtaining start time of each transaction in a case that the concurrency conflict exists, wherein the start time is local time of the second node server when the transaction request is sent; and local time of the second node server is synchronized with time of the GPS atomic clock server in an area which the second node server locates; processing all transactions by the first node server according to the sequence of the start time of each transaction. Throughput of distributed database system can be increased and an arrangement complexity of servers is reduced.

Abstract: A communication system includes a receiver to receive a signal with symbols encoded with a spreading code selected from a set of spreading codes, a filter to produce a filtered signal using a number of correlators less than a number of the spreading codes in the set of spreading codes, and a detector to detect the symbols transmitted by the transmitters from the filtered signal using sparse recovery with the dictionary matrix. The communication system also includes a processor to determine a minimum mean squared error (MMSE) matrix based on the set of spreading codes and a variance of noise in the channels, project the MMSE matrix to a low-dimensional space to produce a low-dimensional MMSE matrix, update the set of coefficients of set of correlators with the elements of the low-dimensional MMSE matrix, and update elements of a dictionary matrix based on the elements of the low-dimensional MMSE matrix.

Abstract: An analog beamforming transmitter includes: a plurality of beamforming transmission circuits coupled in parallel between a signal input and an array of antenna ports, wherein the signal input is configured to receive an analog complex-valued communication signal having an in-phase and a quadrature component, wherein each antenna port of the array of antenna ports is configured to provide a dual-polarized antenna signal having a first polarization component and a second polarization component, wherein each beamforming transmission circuit is coupled between the signal input and a respective antenna port of the array of antenna ports, wherein each beamforming transmission circuit comprises a first coefficient input for receiving a first analog complex-valued beamforming coefficient a set of first analog complex-valued beamforming coefficients and a second coefficient input for receiving a second analog complex-valued beamforming coefficient of a set of second analog complex-valued beamforming coefficients.

Abstract: The appliance for receiving radio frequency signals, usable in particular for the management of uplink signals, comprises an input port of a radio frequency input signal, an amplification unit connected to the input port an output port connected to the amplification unit, an adjustable notch filter operatively connected to the amplification unit, a detection unit of the interference frequency of a disturbance signal of the input signal, an adjustment unit operatively connected to the adjustable notch filter and to the detection unit and able to adjust the central frequency of the adjustable notch filter on the interference frequency.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure provides a power allocating method. A User Equipment (UE) receives power control indication information from a control node, obtains a power control mode, and/or, uplink transmission power configuration information. The UE allocates power for each uplink carrier, based on the power control mode, and/or, the uplink transmission power configuration information. By applying the present disclosure, power waste generated in the following scene may be reduced. A scheduled uplink signal cannot be transmitted in a corresponding carrier due to a busy channel. Subsequently, uplink scheduling efficiency of the UE may be improved, and the whole network efficiency may also be enhanced.

Abstract: The present invention relates to a method and apparatus for beamformed transmission in a wireless local area network. According to one aspect of the present invention, a method for transmitting a Physical layer Protocol Data Unit (PPDU) frame to a plurality of stations (STAs) by an Access Point (AP) in a wireless local area network may be provided. The method may include transmitting a SIGNAL field of the PPDU frame, the SIGNAL field including beamforming information indicating whether beamforming is applied to respective data units of the PPDU frame, and transmitting the data units of the PPDU frame, the data units being individually beamformed or not beamformed according to the beamforming information.

Abstract: An interference cancellation repeater for canceling an interference signal included in an input signal including a first adaptive filter configured to generate a first estimated signal; a second adaptive filter configured to generate a second estimated signal; a first scaler configured to scale the first estimated signal based on a first scale factor determined according to a channel state; a second scaler configured to scale the second estimated signal based on a second scale factor determined according to the channel state; a first canceller configured to generate a first interference canceled signal based on the input signal and the scaled first estimated signal; and a second canceller configured to generate a second interference canceled signal based on the first interference canceled signal and the scaled second estimated signal.

Abstract: A method of transmitting information on a modulation and coding scheme (MCS) in a wireless local area network system is provided. A responding station receives a physical layer protocol data unit (PPDU) from a requesting station, configures a MCS feedback (MFB) based on the PPDU, and transmits feedback information to the requesting station. If the MFB is configured as a response to a MFB request (MRQ) of the requesting station, the feedback information includes the configured MFB and a MFB type field indicating that the MFB is configured as a response to the MRQ of the requesting station. If the MFB is not configured as a response to the MRQ of the requesting station, the feedback information includes the configured MFB, a MFB type field indicating that the MFB is not configured as a response to the MRQ of the requesting station, and coding information indicating a PPDU coding type.

Abstract: In a splitter, a first band pass filter is connected between an antenna terminal and a first terminal, a high pass filter and a second band pass filter are connected between the antenna terminal and a second terminal, a pass band of the second band pass filter is higher than a pass band of the first band pass filter, a cut off frequency of the high pass filter is located closer to the high-frequency side than the pass band of the first band pass filter, the pass band of the second band pass filter is located closer to the high-frequency side than the cut off frequency, and the high pass filter also functions as a notch filter having an anti-resonant frequency in a transition region such that the steepness of the transition region between the pass band of the second band pass filter and the attenuated band is high.

Abstract: A Time and Frequency Division (TaFD) scheduler based on a TaFD allocation unit based credit allocation may schedule both time and frequency division for both legacy Data Over Cable Service Interface Specification (DOCSIS) channels and DOCSIS orthogonal frequency division multiple access (OFDMA) channels. In embodiments, scheduling by the TaFD schedules both single carrier quadrature amplitude modulation (SC-QAM) transmissions and OFDMA upstream transmissions. In embodiments, the scheduler schedules based on TaFD allocation unit based credit allocations, where TaFD allocation unit based credits may be allocated for OFDMA overlapped regions. The credits may be dynamically adjusted based on channel utilization and an outstanding bandwidth demand or a prioritized pending bandwidth demand. The TaFD scheduler may use independent hierarchy priority queuing schemes.

Abstract: Methods, techniques, and systems for transmitting a data frame of an electromagnetic (EM) telemetry signal to or from a downhole location can be performed using multi-channel transmissions in which at least two different channels at two different frequencies are used to send a long header and the data frame. At least a portion of the long header is transmitted at a first frequency, and at least a portion of the data frame and any remaining portion of the long header not transmitted at the first frequency are transmitted at one or more additional frequencies different from each other and the first frequency. In one example, only two channels are used: one channel is used to transmit all of the long header, another channel is used to transmit all of the data frame, and either of the channels is used to transmit an identifier identifying the type of the data frame.