Abstract: A user equipment (UE) includes a receiver that receives a Reference Signal (RS) from a base station (BS), and a transmitter that transmits, to the BS, only precoding-related information used for precoding in the BS in response to the RS. The precoding-related information is at least one of a RS Resource Indicator (RRI) that identifies a radio resource used for RS BS transmission, a Precoding Matrix Indicator (PMI), a Rank indicator (RI), and a Reference Signal Received Power (RSRP). The transmitter only periodically transmits the only precoding-related information. The receiver receives a signal precoded using the precoding-related information by the BS.

Abstract: A signal estimator for an OFDM radio receiver is configured to generate a signal power estimate for a reference signal received on a subcarrier from a plurality of OFDM subcarriers. The signal estimator generates a first channel estimate as a first function of a first set of one or more unfiltered reference-signal channel estimates, where the first set includes an unfiltered reference-signal channel estimate. It generates a second channel estimate as a second function of a second set of one or more unfiltered reference-signal channel estimates, where the second set has no unfiltered reference-signal channel estimate in common with the first set. The signal estimator then generates the signal power estimate by multiplying the first channel estimate with the second channel estimate, such that the generated signal power estimate does not increase with the absolute square of any of the unfiltered reference-signal channel estimates in the first and second sets.

Abstract: The present disclosure includes a time-to-digital converter (TDC) based RF-to-digital (RDC) data converter for time domain signal processing polar receivers. Polar data conversion achieves better SNR tolerance owing to its phase convergence near the origin in a polar coordinate. The proposed RDC consists of a TDC for phase detection and an analog-to-digital converter (ADC) for amplitude conversion. Unlike the conversional data converter, the proposed ADC's sampling position is guided by the detected phase result from the TDC's output. This TDC assisted data-converter architecture reduces the number of bits required for the ADC. In addition, oversampling is no longer needed. With precisely controlled tunable delay cells and gain compensator, this hybrid data convertor is capable to directly convert Quadrature Amplitude Modulation (QAM) waveforms and Amplitude Phase Shift Keying (APSK) waveforms directly from the RF signal without down-conversion.

Abstract: In some examples, a time-based equalizer can be configured to receive an input signal from a channel. The input signal can be distorted by previously received input signals transmitted over the channel. The time-based equalizer can be configured to compensate for distortions in the input signal caused by at least one previously received input signal to provide an ISI compensated input signal. The time-based equalizer can be configured to compensate for the distortions by edge time shifting respective edges of the input signal in time over a time interval for detecting the input signal to new edge time locations based on a feedback signal and edge movement signals. The feedback signal can be generated based on at least one previously received input signal.

Abstract: A wireless audio system including a transmitter using multiple antenna diversity techniques for different signal types is provided. Multipath performance may be optimized, along with improved spectral efficiency of the system.

Abstract: A transmit circuit operated with time-interpolated digital pre-distortion (DPD) coefficients to improve adjacent channel power ratio (ACPR) performance during a power mode change is provided. The transmit circuit includes a DPD circuit configured to operate with a first DPD coefficient according to a first transmit power level of a transmit power amplifier of the transmit circuit. The transmit circuit further includes a DPD coefficient management engine configured to retrieve a second DPD coefficient corresponding to the second transmit power level. The transmit circuit further includes a DPD coefficient time-interpolation engine configured to compute a set of time-interpolated DPD coefficients corresponding to a set of time instants for a transient period when the transmit power amplifier is adapted to the second DPD coefficient.

Abstract: Disclosed is a device capable of compensating for amplitude-modulation to phase-modulation distortion. The device includes a transmitter and a controller. The transmitter includes an amplifier circuit, a phase-shift adjustment circuit, and an output circuit. The amplifier circuit is configured to output an amplified signal according to an input signal. The phase-shift adjustment circuit, set between the amplifier circuit and the output circuit, includes at least one of an adjustable capacitor and an adjustable inductor and is configured to adjust the phase shift of the amplified signal according to a control signal. The output circuit is configured to output an output signal according to the amplified signal. The controller is configured to generate the control signal according to the input signal, in which the control signal varies with the input signal.

Abstract: Certain aspects of the present disclosure relate to methods and apparatus relating to an RE mapping rule for UCI piggyback on PUSCH. For example, a method may include determining a set of uplink resources to use for transmitting acknowledgment (ACK) information in a physical uplink shared channel (PUSCH) transmission, wherein the determination is based at least in part on a payload size of the ACK information, and transmitting the ACK information using the determined set of uplink resources.

Abstract: In a communication apparatus, a specific bit is detected from a communication data decoded in a low-speed state of a communication speed. The specific bit is a bit having undergone an inverse change in a logical value. A signal waveform of the communication signal is acquired, which is recorded in a memory and corresponds to the specific bit. Then, a sampling point of the communication signal in a high-speed state of the communication signal is calculated based on (i) the acquired signal waveform and (ii) a logical value of the specific bit.

Abstract: Provided is a data processing method and apparatus. The method includes: performing an inverse fast Fourier transform (IFFT) on frequency-domain data of L consecutive symbols to obtain time-domain data of the L consecutive symbols, wherein the frequency-domain data of the L consecutive symbols have a subcarrier spacing of fsc, and L?2; and modulating the time-domain data of the L consecutive symbols with a preset function, where the modulated time-domain data of the L consecutive symbols have a symbol interval of 1/f1, and f1<fsc; where a length of a value interval of an independent variable of the preset function is N/f1, and N is a real number greater than or equal to 1.

Abstract: System and method for identifying an RF emitter include: channelizers for channelizing RF signals into several channels; a compressive sensing (CS) encoder for each channel to CS encode the channelized signal to produce an encoded channelized signal in each of the plurality of channels; a summer to sum the encoded channelized signals of all of the plurality of channels to produce an I/Q data; a channelized pulse detection circuit to detect pulses in each channel and produce encoded pulse snippets from the I/Q data; a CS decoder for each channel to CS decode the encoded pulse snippets; a first machine learning device to characterize the decoded pulse snippets and to produce pulse description words (PDWs); and a second machine learning device to associate the PDWs with one or more RF emitters and identify the one or more RF emitters.

Abstract: Apparatus and associated methods relate to a dynamic lane-to-lane skew reduction technique having (a) a clocking architecture configured to provide a corresponding first delayed clock signal and a corresponding second delayed clock signal through a first and a second plurality of routing traces, respectively, and (b) a number of skew compensation circuits configured to process the corresponding first delayed clock signal and the corresponding second delayed clock signal to generate a corresponding user clock signal for a corresponding lane of a transmitter. In an illustrative example, a first routing trace may transmit a first delayed clock signal in a direction opposite to a second routing trace transmitting a second delayed clock signal. By implementing the technique, each transmitter lane may receive a corresponding user clock signal having substantially the same delay relative to a reference clock signal such that dynamic lane-to-lane skew may be advantageously reduced.

Abstract: A method includes, at a first node: transmitting a first calibration signal at a first time-of-departure measured by the first node; and transmitting a second calibration signal at a second time-of-departure measured by the first node. The method also includes, at a second node: receiving the first calibration signal at a first time-of-arrival measured by the second node; and receiving the second calibration signal at a second time-of-arrival measured by the second node. The method further includes: defining a first calibration point and a second calibration point in a set of calibration points, each calibration point comprising a time-of-departure and a time-of-arrival of each calibration signal; calculating a regression on the set of calibration points; and calculating a frequency offset between the first node and the second node based on the first regression.

Abstract: There is provided a method in a network node for controlling multiple input multiple output antenna system, the method including obtaining a plurality of time domain symbols to be transmitted, the plurality of time domain symbols including time domain symbols to be broadcasted via the multiple input multiple output antenna system; determining a mapping between the plurality of time domain symbols and parameters of control units associated with respective antenna elements of the multiple input multiple output antenna system, each control unit including a phase shifter, wherein the parameters control values of the phase shifters, and wherein the mapping is performed based on an algorithm for minimizing distortion and/or bit error rate at receiving user equipment; causing applying the parameters at the control units; and causing transmission of the plurality of time domain symbols via the multiple input multiple output antenna system.

Abstract: A speculative decision feedback equalizer with split unroll multiplexers is provided. The speculative decision feedback equalizer splits an unroll multiplexer into two multiplexers. One split multiplexer provides a data path for the unroll selection signal, and the other split multiplexer provides a separate data path for the summer differential tap. In this way, the loading of an input stage of the summer circuit and the loading from the h1 unrolling loop are decoupled, allowing each split multiplexer to be configured according to a specific timing requirement along a respective data path. Thus, timing performance of the speculative decision feedback equalizer is improved.

Abstract: A method and system implements a repeater in a link of a communication medium. The method and system enables a counter to count alternations of a clock signal received from a host or device over the link, compares a value of the counter to a reference count, adjusts a frequency selection based on the comparison of the value of the counter to the reference count, and locks the frequency selection in response to the counter matching the reference count.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. A first wireless communication device determines a co-phasing factor between at least two transmit beams transmitted by a second wireless communication device. The co-phasing factor is determined for generation of at least one co-phased beam by the second wireless communication device. The first wireless communication device transmits information to the second wireless communication device identifying the co-phasing factor. Numerous other aspects are provided.

Abstract: A transmitter transmits payload data using Orthogonal Frequency Division Multiplexed (OFDM) symbols. The transmitter comprises a frame builder configured to receive the payload data to be transmitted and to receive first signalling data for use in detecting and recovering the payload data at a receiver, and to form the payload data and the first signalling data into frames for transmission, the first signalling data forming a part of the frames with the payload data. A modulator is configured to modulate a first OFDM symbol with the first signalling data and to modulate one or more second OFDM symbols with the payload data. A signature sequence processor provides a signature sequence, a combiner combines the signature sequence with the first OFDM symbol, and a transmission unit transmits the first and second OFDM symbols.

Abstract: A dual-input voltage memory digital pre-distortion (mDPD) circuit and related ET apparatus are provided. In examples discussed herein, an ET apparatus includes an amplifier circuit(s) configured to amplify a radio frequency (RF) signal based on an ET voltage. A tracker circuit is configured to generate the ET voltage based on a number of target voltage amplitudes derived from a number of signal amplitudes of the RF signal. However, the tracker circuit can cause the ET voltage to deviate from the target voltage amplitudes due to various inherent impedance variations, particularly at a higher modulation bandwidth. In this regard, a dual-input voltage mDPD circuit is configured to digitally pre-distort the target voltage amplitudes based on the signal amplitudes such that the ET voltage can closely track the target voltage amplitudes. As such, it is possible to mitigate ET voltage deviation, thus helping to improve overall linearity performance of the ET apparatus.

Abstract: Embodiments of the present disclosure discloses a method for enabling CSI feedback in Multiple Input Multiple Output (MIMO) wireless communication system comprising at least one user equipment (UE) and at least one base station (BS). The UE receives a plurality of downlink (DL) channel state information CSI from the BS and generate an explicit CSI from the received DL CSI. The UE determines a range of frequency domain values and channel state values from the received DL CSI. Upon determination, the UE performs IDFT to determine time domain channel impulse response matrices for the range of frequency domain values and perform CSI quantization. In another embodiment, the processor performs CSI quantization on either full range or a partial range of the time domain channel impulse response matrices to obtain optimized time domain channel explicit CSI and transmit the generated explicit CSI as a feedback to the one or more BS.