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: 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 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: 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.

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: Devices and methods for detection of active return loss for an antenna element of a plurality of antenna elements of a phased array antenna are provided. An exemplary device can convert a voltage differential at an input of a power amplifier (PA) to first current. The device can convert a coupled voltage corresponding to a signal transmitted from the PA to a respective antenna element, to a second current. The device can convert a reflected voltage corresponding to a signal reflected from the respective antenna element, to a third current. The device can convert the first current, the second current, and the third current to an output voltage at a generator output. The device can further have a controller that can adaptively generate codebooks for transmission based on the output voltage.

Abstract: In one embodiment an apparatus includes: a mixer to downconvert a radio frequency (RF) spectrum including at least a first RF signal of a first channel of interest and a second RF signal of a second channel of interest to at least a first second frequency signal and a second second frequency signal; a first digitizer to digitize the first second frequency signal to a first digitized signal, the first digitizer configured to operate as a low-pass analog-to-digital converter (ADC); a second digitizer to digitize the second second frequency signal to a second digitized signal, the second digitizer configured to operate as a band-pass ADC; and a digital processor to digitally process the first digitized signal and the second digitized signal.

Abstract: Disclosed is a transceiver which includes a logic circuit that generates parallel transmission data in response to a first test mode signal or a second test mode signal, a serializer that converts the parallel transmission data into serial transmission data, a driver that outputs the serial transmission data through transmission pads, an analog circuit that receives serial reception data through reception pads, a deserializer that converts the serial reception data into parallel reception data, a plurality of test switches switched in response to the first test mode signal, and a test circuit that is electrically connected to the analog circuit through the plurality of test switches and outputs serial post data corresponding to the serial transmission data to the analog circuit.

Abstract: Antenna systems are provided. In one example, an antenna system includes a first antenna array having a plurality of first antenna elements. The first antenna elements are operable to communicate one or more signals via a communication protocol tin a multiple input multiple output (MIMO) mode. The antenna system includes a second antenna array having a plurality of second antenna elements. The antenna system includes a control circuit configured to control operation of one or more of the second antenna elements of the second antenna array in a first mode or a second mode. In the first mode, one or more of the second antenna elements are configured to provide a secondary function to support communication of the first antenna elements via the communication protocol. In a second mode. One or more of the second antenna elements are configured to support beam forming or beam steering of the first antenna elements.

Abstract: An array of antennae includes a monobit transmitter to insert dither into a transmit signal to form a dithered transmit signal. Monobit receivers process received signals that are combined with the dithered transmit signal to form composite received signals. Digital down converters process the composite received signals to form down converted received signals. A beamformer circuit processes the down converted received signals to form recovered signals.

Abstract: A time-domain reflectometer and a distance measurement method for devices sharing a common bus are provided. The time-domain reflectometer determines a time when to transmit a first ranging signal over a cable based at least in part on when a device presents a first impedance on the cable that is lower than a second impedance of the cable. The time-domain reflectometer transmits the first ranging signal over the cable and in response to transmitting the first ranging signal, receives, over the cable, a first response signal having a peak associated with an impedance mismatch present on the cable resulting from the device presenting the first impedance on the cable. The time-domain reflectometer determines, based on the first response signal, a distance between the time-domain reflectometer and the device.

Abstract: A radio frequency (RF) receiver has an antenna, a low-noise amplifier, a sigma-delta frequency synthesizer/voltage-controlled oscillator (VCO), an in-phase and quadrature (I/Q) mixer, a channel filter, and a digital baseband circuit. The digital baseband circuit has a demodulator, a preamble detection and carrier frequency offset (CFO) estimation circuit, and a CFO to sigma-delta modulation (SDM) input mapper. A preamble field of a digital demodulated signal generated by the demodulator is detected by the preamble detection and CFO estimation circuit. The RF receiver simultaneously compensates its CFO and optimizes a bandwidth of the channel filter based on the detection of the preamble field of the digital demodulated signal by the preamble detection and CFO estimation circuit.

Abstract: Using residential power lines communication (PLC) as the last hop of the CPRI-based front-haul to the indoor users, where unmodified time division multiplexed (TDM) CPRI hyper-frames are transported in between the outdoor distributed unit (DU) and the indoor radio unit (RU) transparently. To countermeasure the hostile environment of power lines, proposed is a novel device, called CPRI-PLC-Gateway (CPG), which serves as an agent for creating a virtual CPRI link between the DU and RU. The proposed CPG aims to meet the desired CPRI options in the presence of the noisy PLC channel while remaining completely transparent to the CPRI protocol operation.

Abstract: A method for detecting on-off keying symbols includes receiving, by each of distributed Rx nodes, a pilot signal for a pilot symbol transmitted from a transmitter, the distributed Rx nodes constituting the wireless body area communication network, obtaining, by each of the Rx nodes, a reference value using the received pilot signal, transmitting, by each of the Rx nodes, received data signal to a fusion center when the data signal for the on-off keying symbol transmitted from the transmitter is received by each of the Rx nodes, calculating, by the fusion center, a weight of the on-off keying symbol for each of the Rx nodes using the reference value obtained from each of the Rx nodes and the received data signal, and detecting, by the fusion center, the on-off keying symbol transmitted from the transmitter using the weight of the on-off keying symbol calculated for each of the Rx nodes.

Abstract: An operation method of a first communication node may include: mapping data symbols to be transmitted to a second communication node of the communication system to resources in a first two-dimensional (2D) domain; pre-processing the data symbols mapped to the resources in the first 2D domain to spread the data symbols on resources in a second 2D domain; mapping the pre-processed data symbols to the resources in the second 2D domain; and performing multi-carrier modulation on the data symbols mapped to the resources in the second 2D domain for each of the resources in the second 2D domain.

Abstract: A transceiver device includes a transmitter and a receiver connected through first and second lines. A first frame period includes an active period for transmitting a first payload and a vertical blank period including a frequency hopping period. The transmitter transmits, to the first and second lines, signals having a first voltage range in a first mode and signals having a second voltage range in a second mode. The transmitter generates a first horizontal synchronization signal in the second mode except for the frequency hopping period, encodes the first horizontal synchronization signal to horizontal synchronization data, and generates a second horizontal synchronization signal in the first mode in the frequency hopping period. The transmitter adds a first clock training pattern to the horizontal synchronization data except for the frequency hopping period, and adds a second clock training pattern to first horizontal synchronization data after the frequency hopping period.