A demodulator for pulse-width modulated clock signals is disclosed. In one aspect, the demodulator includes an edge detector configured to detect transitions in a reference clock and output a signal indicative of timing of the detected transitions. The demodulator may also include a modulation detection circuit configured to identify modulation events of at least one pulse-width modulated pulse in the reference clock based on the signal output from the edge detector and output a signal indicative of the at least one pulse-width modulated pulse modulation event being identified. The demodulator may further include a retiming circuit configured to generate an output clock synchronized with the at least one pulse-width modulated pulse modulation event based on the signal output from the modulation detection circuit.

A demodulator for pulse-width modulated clock signals is disclosed. In one aspect, the demodulator includes an edge detector configured to detect transitions in a reference clock and output a signal indicative of timing of the detected transitions. The demodulator may also include a modulation detection circuit configured to identify modulation events of at least one pulse-width modulated pulse in the reference clock based on the signal output from the edge detector and output a signal indicative of the at least one pulse-width modulated pulse modulation event being identified. The demodulator may further include a retiming circuit configured to generate an output clock synchronized with the at least one pulse-width modulated pulse modulation event based on the signal output from the modulation detection circuit.

A direct conversion wireless transmitter includes IQ mismatch pre-compensation using direct learning adaptation to adjust IQ pre-compensation filtering. Widely-linear IQ_mismatch pre-compensation filtering compensates for IQ mismatch in the TX analog chain, filtering of input data x(n) to provide pre-compensated data y(n) with a compensation image designed to interfere destructively with the IQ_mismatch image. A feedback receiver FBRX captures feedback data z(n) used for direct learning adaptation. DL adaptation adjusts IQ_mismatch filters, modeled as an x(n)_direct and complex conjugate x(n)_image transfer functions w1 and w2, including generating an adaptation error signal based on a difference between TX/FBRX-path delayed versions of x(n) and z(n), and can include estimation and compensation for TX/FBRX phase errors. DL adaptation adjusts the IQ pre-comp filters w1/w2 to minimize the adaptation error signal. Similar modeling can be used for IQ mismatch. The IQ_mismatch pre-compensator can be implemented as a combination of digital signal processing and hardware acceleration.

Systems and methods are provided for enhancing signal quality at receivers in a wireless network. In one embodiment, an antenna is selected from a subset of antennas based on a signal quality parameter such as received signal power or signal-to-noise ratio (SNR). In another embodiment, multiple antennas are applied to independent signal processing paths for the respective antennas where output from the paths is then combined to enhance overall signal quality at the receiver.

A method of operation of a wireless communication system includes: filtering a composite input from a radio frequency signal; developing a raw digital stream by applying an analog correction to the composite input; sampling an extracted signal, from the raw digital stream, by a primary analog-to-digital converter; and monitoring, by a correction control block, the extracted signal including adjusting the analog correction by a digital control from the correction control block.

An apparatus and a method are provided for selecting a receiver in a user equipment (UE). The method includes receiving, at the UE, a signal; determining, at the UE, a switch metric based on correlation metrics of a training sequence of the signal; comparing, at the UE, the switch metric with a threshold; and selecting, at the UE, one of a voice services over adaptive multi-user channels on one slot (VAMOS) receiver and a non-VAMOS receiver based on the comparing result.

The present disclosure discloses an information feedback method, an apparatus and a storage medium. The method includes: receiving, by a first terminal, N groups of reference signals sent by a second terminal, N being a positive integer, where transmission resources of the reference signals of different groups are in a pattern of time division; selecting, by the first terminal, a target reference signal based on the received N groups of reference signals; and sending, by the first terminal, index information of the target reference signal to the second terminal, where the index information is carried in a feedback channel.

A wireless communication apparatus, a wireless communication system, and a wireless communication method enabling any plurality of apparatuses to engage in time division multiplex communication for communicating a plurality of data even if not all apparatuses in the network are accurately synchronized, perform a time division multiplex connection method of an autonomous distributed network that performs a continuous receiving (scan) operation over a frame period so as to obtain a grasp of the wireless communication apparatuses located at the neighborhood at predetermined periods, that includes the steps of receiving beacon signals from other wireless communication apparatuses to obtain a grasp of the wireless communication apparatuses that they are communicable with, calculating the reception slot of the wireless communication apparatus from the received beacon information, setting its own reception slot so as not to collide with the set situation thereof, and forming network autonomously engaging in time division multiplex communication with other wireless communication apparatuses located at the neighborhood.

A method includes, in a receiver, receiving a signal carrying data using multiple antennas, so as to produce multiple respective input signals. The input signals are divided into two or more subsets. The input signals within each of the subsets are combined in a first diversity-combining stage, to produce respective intermediate signals. In a second diversity-combining stage, the intermediate signals are combined to produce an output signal. The output signal is decoded so as to reconstruct the data carried by the received signal.

A transmitter and receiver of a broadcast signal and corresponding methods are provided. The transmitter includes: a preamble symbol inserter configured to insert a preamble symbol including a synchronization part and an information part into a frame; and a transmitting unit configured to transmit the frame including the preamble symbol. The synchronization part includes a plurality of first sequences for measuring frequency offset of the preamble symbol, and the information part includes a plurality of second sequences for measuring a phase shift amount of the information part.