Abstract: Included are a demodulation unit 20 that demodulates a received OFDM modulation signal to acquire a demodulated constellation signal, an ideal constellation signal generation unit 312 that generates an ideal constellation signal from the demodulated constellation signal, a data extraction unit 313 that extracts signal data included in some symbol sections including a known reference symbol, among all symbol sections, from the demodulated constellation signal and the ideal constellation signal, a phase error calculation unit 314 that calculates the phase error of the demodulated constellation signal for the ideal constellation signal, with respect to the extracted signal data, a phase error characteristics estimation unit 315 that estimates the frequency characteristics of the phase error, and a phase error correction unit 316 that corrects the phase error of the demodulated constellation signal, based on the frequency characteristics of the phase error.

Abstract: It is possible to determine, with a simple configuration, that the connection direction of a cable is the reverse direction. A cable is connected for use between a transmission device and a reception device, and transmits data in one direction. A connection direction determination unit determines whether the connection direction is the reverse direction, on the basis of a result of voltage monitoring at a predetermined position on a power-supply line. When the connection direction is determined to be the reverse direction, the information transmission unit transmits information indicating that the connection direction is the reverse direction, to the transmission device or the reception device.

Abstract: A system and method are provided for measuring residual phase noise of a measurement signal using a phase detector including a mixer. The method includes injecting a phase noise spur in a stimulus signal having a known magnitude at a known offset frequency from the stimulus signal carrier frequency; inputting the stimulus signal to a DUT to output a measurement signal; inputting the measurement signal to RF input of the mixer via RF path; inputting the stimulus signal to LO input of the mixer via LO path; mixing the measurement and stimulus signals to provide a residual phase noise signal; measuring actual rejection of stimulus phase noise at the know offset frequency; determining a relative delay between the measurement and stimulus signals in the RF and LO paths based on the actual rejection; and minimizing relative delay between the measurement and stimulus signals to reduce residual phase noise measurement floor.

Abstract: Example electric appliance identification methods and apparatuses are provided. One example method includes obtaining, by a power line communication (PLC) device, a first noise signal in a circuit. The PLC device can then obtain first data based on the first noise signal, where the first data is used to describe a time-frequency feature of the first noise signal. The PLC device can then obtain, based on an electric appliance identification model and the first data, an electric appliance identification result corresponding to the first noise signal, where the electric appliance identification model is obtained based on a signal including a second noise signal of at least one known electric appliance.

Abstract: Methods, apparatus, and processor-readable storage media for generating a frequency hopping arrangement are provided herein. An example computer-implemented method includes calculating a number of useable frequency channels between a starting frequency channel and a stopping frequency channel for a frequency hopping arrangement for a communication session; calculating a frequency channel step value based at least in part on a predetermined required minimum number of frequency channels for the frequency hopping arrangement; selecting frequency channel values to be used in the communication session by iterating through frequency channel values for the useable frequency channels between the starting frequency channel and the stopping frequency channel at intervals of a random frequency channel selection offset value; and establishing the frequency hopping arrangement based at least in part on the selected frequency channel values.

Abstract: Systems and methods are described for dynamically updating a duration of link training time for a first stage of link training implemented to set up a first characteristic of a link connection between a physical layer transceiver (PHY) and a link partner. A first stage of link training preconfigured to last for a first duration of time is initiated and a metric of link quality that measures a link connection quality is initiated. Based on the determined metric of link quality, updating the first duration of time for the first stage of link training.

Abstract: Embodiments disclosed herein relate to reducing or substantially eliminating an insertion loss caused by isolating a transmit circuit from a receive circuit of an electronic device. To do so, an isolation circuit may be disposed between the transmit circuit and the receive circuit. The isolation circuit may have a first signal path and a second signal path. A first portion of the signal may propagate along the first signal path and a second portion of the signal may propagate along the second signal path. A phase shifter may be disposed on the first signal path to shift a phase of the first portion to match a phase of the second portion. The phase-shifted first portion may be combined with the second portion to reduce or substantially eliminate an insertion loss caused by the isolation circuit.

Abstract: The application provides a short training sequence design method and apparatus. The method includes: determining a short training sequence, where the short training sequence may be obtained based on an existing sequence, and the short training sequence with comparatively good performance may be obtained through simulation calculation, for example, by adjusting a parameter, and sending a short training field on a target channel, where the short training field is obtained by performing inverse fast Fourier transformation IFFT on the short training sequence, and a bandwidth of the target channel is greater than 160 MHz.

Abstract: A method for operating a user equipment (UE) comprises receiving information about a downlink (DL) transmission transmitted from NRRH>1 RRHs, wherein: NRRH=number of remote radio heads (RRHs), RRH r comprises a group of antenna ports, and r=1, . . . , NRRH; receiving the DL transmission; and decoding the information about the DL transmission; wherein the DL transmission is based on a scheme that is a combination of a precoding scheme and a diversity scheme, wherein the precoding scheme corresponds to applying an intra-RRH precoder component to antenna ports within an RRH, and wherein the diversity scheme corresponds to applying an inter-RRH diversity component to antenna ports across RRHs.

Abstract: This application provides a reference signal generation method in which a terminal device or a network device generates a reference signal by using a pseudo-random sequence initial factor cinit provided in the embodiments of this application. Compared with a solution in the current technology, the reference signal generation method can support a relatively large quantity of reference signal sequences, to better meet the requirements of different 5G scenarios. The reference signal generation method may include obtaining a reference signal sequence based on a pseudo-random sequence initial factor cinit, and mapping the sequence to one or more OFDM symbols. The pseudo-random sequence initial factor cinit is related to a parameter d, d=max(log2(nID,max+1)?10,0) or d=max(log2)(nID,max+1)?12,0), max represents that a larger value is selected from two values, and nID,max represents a maximum value of a reference signal sequence ID.

Abstract: An information handling system includes a transmitter that transmits data over a channel to a receiver. The transmitter operates to transmit a test sequence including a repeating sequence of a number of logic 1's and the number of logic 0's. The receiver operates to detect noise injected onto the channel based upon an output from a data eye sampler in response to the test sequence.

Abstract: Methods and apparatuses for uplink multi-beam operation. A method for operating a user equipment (UE) includes receiving, from a base station, an aperiodic reference signal (RS) trigger and, at a later time instant, an uplink (UL) beam indication. The method further includes decoding the aperiodic RS trigger and decoding the UL beam indication. The method includes determining, from the UL beam indication, a transmit spatial filter applied to a signal to be transmitted on a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH) and transmitting, to the base station, the signal on the PUSCH or the PUCCH. The transmit spatial filter corresponds to a reference RS. The UL beam indication includes a state of a transmit configuration associated with the reference RS.

Abstract: A method for adaptive transmitter symbol arrangement in delay-Doppler domain grids including retrieving one or more current communication relevant parameters; deriving from the one or more current communication relevant parameters at least a maximum expected Doppler frequency shift for a transmitted signal; placing at least one pilot symbol in a delay-Doppler domain grid; placing a minimum number of guard symbols around the at least one pilot symbol in the delay-Doppler domain grid so the guard symbols occupy a guard space around the at least one pilot so any grid position outside the guard space around the at least one pilot has a distance along the first grid direction exceeding the derived first guard space parameter and also has a distance along the second grid direction that exceeds the second guard space parameter; and placing data symbols in the delay-Doppler domain grid outside the guard space for data transmission.

Abstract: A physical layer transceiver for a data channel includes receiver circuitry configured to receive signals on the data channel, transmit circuitry configured to transmit signals onto the data channel, and adaptive filter circuitry coupled to the receiver circuitry and the transmit circuitry and configured to filter the data channel by operating on input frequency-domain data samples to output filtered data samples. The adaptive filter circuitry includes error sample generation circuitry configured to generate error samples representing a difference between a target response and the filtered data samples, arithmetic-only circuitry configured to approximate a windowing function to operate on the error samples, and output sample generation circuitry configured to operate on windowed error samples to provide the output filtered data samples. The comparison circuitry may be configured for time-domain operation and may further be configured to transform the error signals into frequency-domain error signals.

Abstract: Apparatus and methods for envelope alignment calibration in radio frequency (RF) systems are provided. In certain embodiments, calibration is performed by providing an envelope signal that is substantially triangular along an envelope path, and by providing an RF signal to a power amplifier along an RF signal path. Additionally, an output of the power amplifier is observed to generate an observation signal using an observation receiver. The observation signal includes a first peak and a second peak, and a delay between the envelope signal and the RF signal is controlled based on relative size of the peaks of the observation signal to one another.

Abstract: Provided are a data modulation method and apparatus, and a storage medium. The method includes: modulating a data sequence [b(i)] to obtain a data sequence [s(k)]; wherein [s(k)] has the following characteristics: in a case where k = 2 ? i , s ? ( k ) = e j ? ( ? 2 ? ( i ? ? mod ? ? 2 ) + ? ) 2 ? [ ( 1 - 2 ? b ? ( i ) ) + j ? ( 1 - 2 ? b ? ( i ) ) ] , or ? ? s ? ( k ) = e j ? ( ? 2 ? i + ? ) 2 ? [ ( 1 - 2 ? b ? ( i ) ) + j ? ( 1 - 2 ? b ? ( i ) ) ] ; in a case where k = 2 ? i - 1 , s ? ( k ) = 1 2 ? ( s ? ( k - 1 ) + s ? ( k + 1 ) ) , or ? ? s ? ( k ) = ( s ? ( k - 1 ) ? s ? ( k + 1 ) ) 1 2 ; wherein i and k are non-negative integers, and ? is a preset constant.

Abstract: Systems and methods for automated network cabling integrity monitoring are provided. In one embodiment a system manager for a network that includes a network switch coupled to patching equipment comprises: at least one processor configured to execute software, the software comprising a network integrity monitor. The network integrity monitor controls a cable diagnostic test function to obtain a fault-distance measurement for a port of the switch. The network integrity monitor correlates the fault-distance measurement with network cable length information associated with the switch port to identify one or both of a network cable segment associated with the fault-distance measurement and a fault location. The cable length information is retrieved from a database. The network integrity monitor produces an output identifying of one or both of the network cable segment associated with the fault-distance measurement and the fault location to be displayed on a display device.

Abstract: Methods, systems, and devices for wireless communications are described in which a user equipment (UE) or base station may generate orthogonal frequency division multiplexing (OFDM) symbols based on a permutation matrix (P) that permutes guard interval (GI) samples and data samples such that the OFDM symbols have power values across the symbols that are supportable by a transmitting device. The permutation matrix may map GI inputs to a subset of subcarriers for an OFDM communication, where the permutation matrix determined based at least in part on a first number of columns of a sub-matrix of a first matrix. The first matrix may be an inverse fast Fourier transform (IFFT) matrix, or may be a product of the IFFT matrix and a subcarrier mapping matrix. The first number of columns may correspond to a number of subcarriers that carry time-domain GI samples.

Abstract: Apparatuses, methods, and systems are disclosed for precoding wireless communications. An apparatus includes a processor that determines a transform precoder. The processor (805) precodes a plurality of source information symbols over a set of available physical transmission resources using the determined transform precoder. The processor combines the precoded source information symbols using a redundant representation.

Abstract: Method and apparatus for PTRS for OTFS waveforms. The apparatus measures a PTRS using an OTFS including a delay-Doppler domain. The OTFS includes a plurality of symbols in the delay-Doppler domain based on the PTRS. A first symbol of the plurality of symbols includes a first PTRS resource sample having a first value in the delay-Doppler domain. A second symbol of the plurality of symbols includes a second PTRS resource sample having a second value in the delay-Doppler domain. The first PTRS resource sample is adjacent to the second PTRS resource sample. The apparatus performs phase noise tracking for a data channel based on the measured PTRS.