Abstract: Disclosed herein are system, apparatus, article of manufacture, method and/or computer program product embodiments, and/or combinations and sub-combinations thereof, for synchronizing playback of audiovisual content with a dumb speaker. In some embodiments, a display device transmits a spread spectrum signal to a dumb speaker over a data channel using a spread spectrum code. The display device then receives the spread spectrum signal from the dumb speaker over an audio data channel. The display device despreads the spread spectrum signal based on the spreading code. The display device determines a time of receipt of the spread spectrum signal. The display device calculates an audiovisual output path delay for the dumb speaker based on the time of receipt and a time of transmission. The display device then synchronizes the playback of the audiovisual content at the dumb speaker and a smart speaker based on the audiovisual output path delay.

Abstract: A method comprises: digitizing a signal to produce a reference frame of amplitude samples in a time-domain; generating a spectrogram that includes energy content of the reference frame, represented by amplitude and phase, across frequency and time of the spectrogram; detecting regions of the spectrogram that have energy levels greater than a threshold level to produce detected regions; copying energy content from the detected regions into an energy vector; and performing an Inverse Fourier transform (IFT) based on the energy vector to transform the energy vector into in-phase (I) and quadrature (Q) (IQ) samples in the time-domain.

Abstract: Disclosed retimer modules and methods enable equalizer training during link speed negotiation. One illustrative retimer module includes: an analog to digital converter that uses a sampling clock to digitize a receive signal; an equalizer that converts the digitized receive signal into an equalized signal; a decision element that derives a receive symbol stream from the equalized signal; and a clock recovery module that derives the sampling clock based at least in part on an equalization error of the equalized signal, the sampling clock having a frequency with a range including a baud rate of the receive signal at a first supported speed and including a frequency not less than twice the baud rate of the receive signal at a second supported speed.

Abstract: A radio frequency module includes: a module board including a first principal surface and a second principal surface on opposite sides of the module board; a transmission input terminal; a first transmission amplifier disposed on the first principal surface that amplifies a transmission signal input through the transmission input terminal; and a first switch disposed on the second principal surface that connects and disconnects the transmission input terminal and the first transmission amplifier.

Abstract: A frequency-division duplex communication apparatus, including a first radio frequency port, a second radio frequency port coupled to an antenna, a third radio frequency port, a fourth radio frequency port coupled to a balancing circuit, and a filtering arrangement having filters of a first type, a filter of a second type and a filter of a third type. The filters of the first type pass signals at a first frequency band and reject signals at a second frequency band. The filter of the second type rejects signals at the first frequency band and passes signals at the second frequency band. The filter of the third type rejects signals at the first frequency band and passes signals at the second frequency band and the phase response of the filter of the second type is 180 degrees from the phase response of the filter of the third type.

Abstract: A radio-frequency module includes a module substrate having a first principal surface and a second principal surface on opposite sides of the module substrate, a power amplifier capable of amplifying a transmission signal, a low-noise amplifier capable of amplifying a reception signal, a first switch connected to an input terminal of the power amplifier and disposed on the second principal surface, a second switch connected to an output terminal of the low-noise amplifier and disposed on the second principal surface, and a first ground terminal disposed in a region that is on the second principal surface and that is between the first switch and the second switch in plan view of the module substrate.

Abstract: A PAM-4 DFE receives an input signal distorted by inter-symbol interference (IS I) and expressing a series of symbols each representing one of four pulse amplitudes to convey two binary bits of data per symbol. High-order circuitry resolves the most-significant bit (MSB) of each two-bit symbol, whereas low-order circuitry 115 resolves the immediate least-significant bit (LSB). An immediate value of the MSB is used to select a set of IS I offsets used to resolve the LSB. Resolved values of the prior values of the MSB and LSB are then used to select the IS I offset for the immediate symbol.

Abstract: An electronic device including: an antenna; a first switch functionally connected to the antenna and configured to perform switching to connect the antenna with a transmission path or a reception path; a first filter and a first amplifier configured to form the reception path; a second filter and a second amplifier configured to form the transmission path; a Radio Frequency Integrated Circuit (RFIC) connected to the reception path and the transmission path and configured to process an RF signal; and at least one processor configured to control the RFIC and the first switch such that a transmission signal generated by the RFIC is radiated from the antenna via the transmission path.

Abstract: The present disclosure relates to an interference estimation method and apparatus. The apparatus includes at least one first processor, a serving channel matrix, and an interference channel matrix. The at least one first processor generates an input vector from at least one of a received signal vector corresponding to a received signal with a serving signal and an interference signal. The serving channel matrix corresponds to the serving signal. The interference channel matrix corresponds to the interference signal and a second processor. The second processor executes at least one machine learning model trained by sample input vectors and sample interference parameters. The at least one first processor provides the input vector to the second processor and determines interference parameters corresponding to the interference signal based on an output vector of the at least one machine learning model provided by the second processor.

Abstract: A filter includes: a series-arm resonator; and a parallel-arm resonator. The series-arm resonator and the parallel-arm resonator each include: an interdigital transducer (IDT) electrode formed on a substrate and including a plurality of electrode fingers; and a protective film. The protective film included in the parallel-arm resonator is thinner than the protective film included in the series-arm resonator. The parallel-arm resonator has a first fractional bandwidth ((the higher-order resonance frequency?the resonant frequency)/the resonant frequency) greater than the first fractional bandwidth of the series-arm resonator. The parallel-arm resonator has a second fractional bandwidth ((the higher-order antiresonant frequency?the antiresonant frequency)/the antiresonant frequency) greater than the second fractional bandwidth of the series-arm resonator.

Abstract: A radio-transmitting device comprises a radio interface operating in a predetermined frequency band, operatively arranged for modulating a carrier having a frequency in the frequency band, while switching the frequency of the carrier among several hopping frequencies in the frequency band, according to a hopping sequence, to obtain a spread-spectrum modulated signal, wherein the spread-spectrum modulated signal includes, in a preamble portion, a plurality of sync words, each combined with at least one instance of a sequential index, the sync words being transmitted at different frequencies, and a data portion following the preamble portion and including a plurality of frequency hops.

Abstract: This disclosure provides methods, devices and systems for wireless communication, and particularly, methods, devices and systems for implementing a joint transmission feature in a wireless communication system. Using the joint transmission feature, multiple access points (APs) may use an aggregated collection of antennas of multiple APs to simultaneously transmit a joint beamformed transmission to one or more stations (STAs). The techniques in this disclosure may prevent or reduce variations in relative gain adjustments by the APs that could otherwise negatively impact the joint transmission. In some implementations, a network device may determine a normalized gain adjustment value based on power parameters associated with each of the multiple APs. In some other implementations, each AP may determine the normalized gain adjustment value based on power parameters shared between the APs.

Abstract: Various embodiments provide for quarter-rate data sampling with loop-unrolled decision feedback equalization (DFE) that uses a two-summer (e.g., two-summing node) approach. For example, some embodiments provide for quarter-rate data sampling comprising a plurality of unrolled first-tap DFE loops, and two summers and a two-to-one multiplexer for each of the other tap loops used for direct feedback (e.g., second tap, third tap, fourth tap, etc.

Abstract: Systems and techniques are described that are directed to filter frequency response shift compensation, including attenuation compensation. Attenuation compensation can apply a pre-distortion to compensate for the magnitude of attenuated resource units (RUs). Additionally, filter frequency response shift can involve applying PHY Protocol Data Unit (PPDU) scheduling schemes. For example, a PPDU scheduling scheme can reduce bandwidth in the channel, thereby dropping the affected RUs. The attenuation compensation is implemented using front ends that provide feedback to a respective radio, which allows that radio to apply the appropriate pre-distortion. The front end can include one or more filters enabling frequency domain coexistence between collocated radios operating in the differing Wi-Fi bands, and a coupler that provides the feedback indicating the frequency response shift to a radio.

Abstract: Systems, methods, and devices for reducing insertion loss and/or swapping transmitter (TX) and receiver (RX) frequencies in an electrical balance duplexer (EBD) used in a transceiver device for frequency division duplexing (FDD) applications are provided. Feed-forward receiver path from the antenna to a low noise amplifier (LNA) and a feed-forward path from the antenna to a power amplifier (PA) of the EBD may be used for reducing insertion loss of the RX and TX signals. In some embodiments, switches may be used to selectively alter operational modes for varied levels of isolation and/or swapping of TX and RX frequencies.

Abstract: A radio frequency module includes: a module board including a first principal surface; a reception filter disposed on or above the first principal surface; a transmission filter disposed on the reception filter; a switch mounted on the module board; and a bonding wire that connects the transmission filter to the switch. One end of the bonding wire is connected to the transmission filter and the other end of the bonding wire is connected to the switch.

Abstract: A transmission apparatus that (i) generates a Quadrature Phase Shift Keying (QPSK) modulation signal s1(t) by applying a QPSK modulation scheme to a first data sequence, (ii) generates a 16-Quadrature Amplitude Modulation (QAM) modulation signal s2(t) by applying a 16-QAM modulation scheme to a second data sequence, (iii) generates a transmission signal z1(t) and a second transmission signal z2(t) by applying a phase hopping process, a precoding process, and a power adjust process to the QPSK modulation signal s1(t) and the 16-QAM modulation signal s2(t), wherein an average transmission power of the 16-QAM modulation signal s2(t) being the same as an average transmission power of the QPSK modulation signal s1(t), and (iv) transmits the transmission signal z1(t) from a first antenna at a first time and a first frequency and the second transmission signal z2(t) from a second antenna at the first time and the first frequency.

Abstract: An apparatus and a method for handling non-continuous data transfer for a decision feedback equalizer in a memory subsystem. The apparatus includes a plurality of end-of-transfer detection flip-flops configured to sample a read data enable signal; a flag flip-flop; a first logic circuit configured to generate a load enable signal in response to the end-of-transfer detection flip-flops and the flag flip-flop; a second logic circuit configured to generate a load data in response to the end-of-transfer detection flip-flops, the flag flip-flop and the read data enable signal; a plurality of first-in-first-out buffers configured to receive the load enable signal and the load data, and unload the load data as an end-of-transfer indicator in line with data strobe; and a plurality of bypass flip-flops configured to generate a bypass signal in response to the end-of-transfer indicator.

Abstract: Method for processing a sequence of digital signal samples including a first sub-sequence and a second sub-sequence. Forming a first block of samples comprising the first sub-sequence and a second block of samples comprising header samples followed by the second sub-sequence. Demodulating the first block of samples through a digital demodulator to produce a first block of symbols, and the second block of digital signal samples through a second digital demodulator to produce a second block of symbols. The second demodulator implementing a carrier synchronisation or symbol rate synchronisation starting with the header samples, which comprise samples in a number adapted in such a way that the synchronisation is effective before the second demodulator demodulates the second sub-sequence. Reconstructing a sequence of symbols by concatenating the first symbol block with the second symbol block.

Abstract: Systems and methods are disclosed for an integrated circuit (IC) comprising an oscillator, an on-off-keying modulator configured to modulate input data coupled to the oscillator, a serial communications transmitter coupled to the on-off-keying modulator, a serial communications receiver coupled to the serial communications transmitter by a set of cables, and an envelope detector coupled to the serial communications receiver. In the IC, power and data are simultaneously delivered across the same set of cables from the serial communications transmitter to the serial communications receiver.