Abstract: A TX-TX pre-compensation system that estimates unwanted coupling in a victim transmit chain caused by an aggressor transmit chain and injects a pre-compensation signal to cancel out the estimated coupling. In some embodiments, a signal measurement module estimates the amplitude, phase, and envelope delay of the coupling and an isolation pre-compensation module generates the pre-compensation signal based on the estimated amplitude, the estimated phase, the estimated envelope delay, and the difference between the carrier frequencies of the transmit chains. Since the phase of the coupling may be affected by the carrier frequency of the transmit chains, in some embodiments the phase of the pre-compensation signal is adjusted in response to a change in carrier frequency. Since the amplitude of the coupling may be affected by attenuator gain settings, in some embodiments the amplitude of the pre-compensation signal may be adjusted in response to a change in attenuator gain setting.

Abstract: Systems and methods are disclosed herein for providing efficient Digital Predistortion (DPD). In some embodiments, a system comprises a DPD system comprising a DPD actuator. The DPD actuator comprises a Look-Up Table (LUT), selection circuitry, and an approximate multiplication function. Each LUT entry comprises information that represents a first set of values {p1, p2, . . . , pk} and a second set of values {s1, s2, . . . , sk} that represent a LUT value of s1·2p1+s2·2p2+ . . . +sk·2pk where each value si ?{+1 , ?1} where k?2. The selection circuitry is operable to, for each input sample of an input signal, select a LUT entry based on a value derived from the input sample that is indicative of a power of the input signal. The approximate multiplication function comprises shifting and combining circuitry that operates to, for each input sample, shift and combine bits that form a binary representation of the input sample in accordance with {p1, p2, . . . , pk} and {s1, s2, . . .

Abstract: An interface circuitry includes an interface, a transmitter module and a receiver module. The transmitter module includes an input stage, a driving circuit and a regulator circuit. The input stage is powered by a regulated voltage and configured to receive an input signal and generate a first output signal and a second output signal. The driving circuit is configured to drive the interface according to the first output signal and the second output signal and to provide a first data signal, a second data signal and a driving signal. The regulator circuit is coupled between the input stage and the driving circuit, and configured to provide the supply voltage according to the driving current.

Abstract: Disclosed is an RF (Radio Frequency) power source having a power supply configured to convert an AC (Alternating Current) voltage at a power supply input to a second voltage at a power supply output, and an RF generator configured to receive the second voltage at an RF generator input and to use the second voltage to produce an output RF signal at an RF generator output. According to an embodiment of the disclosure, the power supply performs the voltage conversion without galvanic isolation between the power supply input and the power supply output, which can increase energy efficiency while reducing complexity and cost as well. Instead, the RF generator is provided with galvanic isolation between the RF generator input and the RF generator output, which can be sufficient for achieving galvanic isolation between the power supply input and the RF generator output for safety reasons.

Abstract: A signal predistortion circuit configuration includes a digital predistortion circuit, a first transceiver, a first analog front-end (AFE) circuit, a second transceiver, and a second AFE circuit. The digital predistortion circuit outputs a first transmission signal according to first predistortion parameters and outputs a second transmission signal according to second predistortion parameters, and the digital predistortion circuit determines whether to adjust the first predistortion parameters according to a first reception signal and determines whether to adjust the second predistortion parameters according to a second reception signal. A transmitting circuit of the first transceiver, the first AFE circuit, and a receiving circuit of the second transceiver jointly generates the first reception signal according to the first transmission signal.

Abstract: In some examples, a device includes a capacitor arranged across the galvanic isolation barrier, where the capacitor is configured to communicate a single-ended signal from a first voltage domain to a second voltage domain. The device also includes a high-pass filter arranged in the second voltage domain and configured to receive the single-ended signal from the capacitor. The device further includes a low-pass filter arranged in the second voltage domain and coupled between the high-pass filter and a low-impedance node. The high-pass filter is coupled between the capacitor, the low-pass filter, and the low-impedance node, and the low-pass filter is configured to generate a differential signal.

Abstract: This application relates to the field of communications technologies and provides a quasi co-location indication method and an apparatus, so that a terminal learns of a quasi co-location relationship between a plurality of antenna ports of a first reference signal resource. The method includes: A terminal receives quasi-co-location indication information, where the quasi-co-location indication information is used to indicate M antenna port groups corresponding to a first reference signal resource, each of the M antenna port groups includes one or more CDM groups of the first reference signal resource, the CDM group includes a plurality of antenna ports, and any two antenna ports in a same antenna port group are in a quasi-co-location relationship. Then, the terminal determines a quasi-co-location relationship between a plurality of antenna ports of the first reference signal resource based on the quasi-co-location indication information.

Abstract: Provided is a human body communication (HBC) apparatus for a near field communication (NFC) signal, the HBC apparatus including: a first communicator configured to receive a first NFC signal from an NFC reader through a body in proximity to the body; and a second communicator configured to transmit a signal to a user device, wherein first data included in the first NFC signal received from the NFC reader through the body by the first communicator is transmitted to the user device by the second communicator.

Abstract: Methods and systems are described for receiving a reference clock signal and a phase of a local oscillator signal at a dynamically-weighted XOR gate comprising a plurality of logic branches, generating a plurality of weighted segments of a phase-error signal, the plurality of weighted segments including positive weighted segments and negative weighted segments, each weighted segment of the phase-error signal having a respective weight applied by a corresponding logic branch of the plurality of logic branches, generating an aggregate control signal based on an aggregation of the weighted segments of the phase-error signal, and outputting the aggregate control signal as a current-mode output for controlling a local oscillator generating the phase of the local oscillator signal, the local oscillator configured to induce a phase offset into the local oscillator signal in response to the aggregate control signal.

Abstract: A wireless communications system includes a pre-distortion actuator configured to receive a carrier-modulated signal and convert the carrier-modulated signal into an output signal. The system includes one or more antennas configured to receive the output signal and transmit the output signal, one or more power amplifiers electrically coupled between the pre-distortion actuator and the one or more antennas and a receiver configured to receive the output signal over-the-air and generate feedback based on the output signal. The pre-distortion actuator is configured to generate the output signal by applying a correction to the carrier-modulated signal that cancels out nonlinearities associated with the one or more antennas and/or the one or more power amplifiers. The pre-distortion actuator is configured based on the feedback.

Abstract: The disclosure provides a method and system to recover some or all of the data missing in types of gaps that occur in data streams received via telemetry. The gaps can be filled in real time to enhance operator understanding of current operations. For gaps created by special sequences sent via telemetry during a time interval that telemetry would be sending measurement blocks (MB) of data, the gaps can be filled using special MBs combined with MBs for a next time interval to create combined MBs, sent via telemetry, and extracted to backfill the gaps. For gaps caused by corrupted data, the gaps can be filled with data from overlapping MBs having overlapping data based on overlapping time intervals. For gaps caused by gap events, including different drilling rates of penetration, event MBs with sampling rates different than a predetermined sampling rate can be sent via telemetry.

Abstract: Provided is a distortion compensation device performing distortion compensation on a signal to be amplified by an amplifier, of which an internal state affecting a distortion characteristic varies, using a distortion compensation model, wherein the distortion compensation model includes a plurality of calculation models having respective distortion compensation characteristic for the amplifier in different internal states, and a combiner combining the plurality of calculation models at a combination ratio corresponding to the internal state that varies.

Abstract: A communication apparatus includes a PHY frame generating circuit that generates a PHY frame including either of a short Sector Sweep frame and a Sector Sweep frame; and an array antenna that selects, based on the PHY frame, any sector from among a plurality of sectors and transmits the PHY frame. In a case where, in the PHY frame including the short Sector Sweep frame, a Direction field of the short Sector Sweep frame indicates Initiator Sector Sweep, the PHY frame generating circuit replaces a Short Sector Sweep Feedback field indicating a number of a selected best short Sector Sweep with a Short Scrambled Basic Service Set ID field indicating an abbreviated address generated from an address of a destination communication apparatus.

Abstract: A precoded signal including reference symbols can be received. Channels for the reference symbols can be estimated. A channel for the data symbols can be estimated by taking an inner product of a conjugate of a data symbol precoder and the reference symbol channel estimates. Received data symbols can be demodulated based on the estimated channel.

Abstract: Methods, systems, and devices for wireless communications are described in which measurements of a number of beams that are transmitted from a first device, measured at a second device are provided in a beam switch metric report from the second device. The beam switch metric report may provide the first device with information that is otherwise unavailable to the first device and that may be used for setting beam management parameters.

Abstract: A method for data transmission of a value pair in a network system. The method is performed in a network node and comprises transforming a value pair, wherein the value pair is represented as a complex number, by changing a magnitude of the value pair with a factor of 2 raised to the power of N/2, where N is an integer, and when N is odd the transform comprises a rotation in the complex plane of an odd integer multiple of 45 degrees, and transmitting the transformed value pair to another network node, wherein the transmission comprises an indication of the value of N. Network nodes, computer programs and a computer program product for data transmission of a value pair in a network system are also presented.

Abstract: Device, methods and systems for aspects of channel estimation for orthogonal time frequency space (OTFS) modulation in wireless systems are described. In an aspect, a method for wireless communication may include receiving, using multiple receive antennas, from a number of user devices, non-orthogonal pilots wherein at least some transmissions of the non-orthogonal pilots from different user devices overlap in at least some time and frequency resources, estimating individual pilots from the number of user devices by computing a pilot separation filter for each antenna, and estimating the wireless channel at time and frequency resources used by the non-orthogonal pilots by filtering the receiving signal at the multiple receiver antennas.

Abstract: An extensible communication system is described herein. The system includes a first module for receiving a root index value and for generating a constant amplitude zero auto-correlation sequence based on the root value. The system further includes a second module for receiving a seed value and for generating a Pseudo-Noise sequence based on the seed value. The system further includes a third module for modulating the constant amplitude zero auto-correlation sequence by the Pseudo-Noise sequence and for generating a complex sequence. The system further includes a fourth module for translating the complex sequence to a time domain sequence, wherein the fourth module applies a cyclic shift to the time domain sequence to obtain a shifted time domain sequence.

Abstract: An OFDM transmitter and an OFDM receiver respectively transmit and receive N (N?2, N is an integer) control symbols. For each control symbol, a guard interval time-domain signal is, for example, identical to a signal obtained by frequency-shifting at least a portion of a useful symbol time-domain signal by an amount different from any other symbol, or to a signal obtained by frequency-shifting one or both of a portion and a span of a useful symbol interval time-domain signal different from any other symbol by a predetermined amount.

Abstract: Methods for performing mixed-mode Multiply-Accumulate (MAC) functions in an integrated circuit (IC) are disclosed. By performing part of the MAC operation spatially and in parallel, and part of it temporally and serially, the number of MAC operations can be programmed in the serial/temporal MAC segment as a multiple of the parallel/spatial MAC segment. Such a trait provides a degree of flexibility in programming the mixed-mode MAC function. A Programmable-Hybrid-Accumulation (PHA) method, performs the accumulation function of the MAC IC, by transforming the accumulation signal to a hybrid accumulation signal. The hybrid accumulation signal is comprised of a Most-Significant-Portion (MSP) and a Least-Significant-Portion (LSP), wherein the portions of the hybrid accumulation signal can be programmed in accordance with cost-performance objectives of an end application.