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.

Abstract: A transmitter device includes a transmitter circuit, a voltage generator circuit, and a calibration circuit. The transmitter circuit is configured to selectively operate in a calibration mode or a normal mode in response to a first control signal, in which the transmitter circuit has a first output terminal and a second output terminal. The voltage generator circuit is configured to generate a bias voltage, in which the bias voltage has a first level in the calibration mode and has a second level in the normal mode, and the first level is different from the second level. The calibration circuit is configured to be turned on in the calibration mode according to the bias voltage and a second control signal, in order to calibrate a level of the first output terminal and a level of the second output terminal.

Abstract: A system for controlling a level of communication signals broadcast onto an associated power line communication (PLC) network by an associated transmitting device includes an input circuit, an adjustable amplifier circuit, and an output circuit. The input circuit receives a first communication signal having a first signal level from the associated transmitting device. The adjustable amplifier circuit applies a selectable gain to the first communication signal based on one or more of a monitored condition of the associated vehicle and/or a monitored condition of the associated PLC network to generate a level-adjusted communication signal having a second signal level different than the first signal level of the first communication signal. The output circuit receives the level-adjusted communication signal and broadcasts the level-adjusted communication signal onto the associated PLC network.

Abstract: A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.

Abstract: A millimeter-wave phase array system may include massive heterodyne transceivers as its building elements. A transceiver of each element may include an IQ image rejection heterodyne transmitter and a receiver. Each transmitter may include a single DAC, a Tx I channel, and a Tx Q channel. Each receiver may include an Rx I channel, an Rx Q channel, and a single ADC. For Tx IQ image rejection calibration, amplitude and phase offsets are determined, using both the Tx I and Tx Q channels from a first element and using only one of the Rx I or Rx Q channel from a second element. The IQ channel imbalances are compensated using the offsets in analog domain. A similar procedure is used for Rx IQ image rejection calibration with alternated signal path enabling. A frequency response variation of an RF front end is detected with a single path Tx/Rx channel setup.

Abstract: Techniques are presented to improve the accuracy of and reduce the time required for calibration of an in-phase/quadrature (I/Q) transmission circuit. A measurement receiver measures the I/Q mismatch, where an RF phase shift is introduced to distinguish between the transmitter and measurement receiver I/Q mismatches. Rather than assuming an amount of introduced phase shift, a measurement is used to estimate the phase shift. This phase estimate is then used to determine and correct the I/Q mismatch in the transmitter and measurement receiver. An iterative process can be used to improve the I/Q correction factors. Using simple signal processing to measure the phase shift during calibration and to perform the image calibration calculations, the phase shifter requirements can be significantly relaxed, resulting in faster design time and reduced design area/cost. This approach results in reduced calibration time, thus contributing to reduced factory production time and enabling faster live mode image calibration.