A digital triggering system for processing data relating to a signal received is described, with an analog-to-digital converter, an IQ data source providing IQ data, a first digital signal processor, and at least a second digital signal processor. The first digital signal processor is connected with the IQ data source via a first signal path. The second digital signal processor is connected with the IQ data source via a second signal path. The first digital signal processor has at least a first signal processing parameter. The second digital signal processor has at least a second signal processing parameter. The first signal processing parameter and the second signal processing parameter are independent from each other. The first digital signal processor generates a trigger signal based upon a characteristic of the IQ data obtained from the IQ data source. The first digital signal processor triggers the second digital signal processor via the trigger signal to acquire IQ data obtained from the IQ data source. Further, a method for processing data is described.

5G and especially 6G are susceptible to phase faults due to rapid phase fluctuations, usually in the local oscillator of the user device. Low-cost IoT applications that 6G is intended to serve may be impractical unless phase noise mitigation can be applied on each uplink and downlink message. Accordingly, a single-branch phase-tracking reference is disclosed occupying just a single resource element, in which one quadrature branch is transmitted with a predetermined maximum modulation amplitude, and the other branch has zero amplitude. The receiver can then quantify the phase noise (or the phase rotation angle) according to a ratio of the as-received branch amplitudes, and mitigate a concurrent message by de-rotating each message element by the same phase angle, thereby restoring high reliability at high frequencies at negligible cost.

A wireless device, and corresponding method, having a receiver configured to receive a signal having in-phase and quadrature components; a non-linear filter demodulator configured to translate noncoherently the in-phase and quadrature components into phase and frequency domain signals, and to estimate and correct carrier frequency offset; a coherence signal parameter acquisition unit is configured to estimate and correct at least one correct coherence signal parameter based on the in-phase and quadrature components and the phase or frequency domain signal; and a symbol detector is configured to detect information in the phase or frequency domain signal. If optimal coherent information detection is desired, the at least one signal parameter is not only carrier phase offset and carrier timing offset, but also phase frequency offset, wherein the estimation and correction of the carrier frequency offset performed by the signal parameter acquisition unit is more precise than that performed by the non-linear filter demodulator. In such a case the detector is configured to detect information in the phase domain signal.

The proposed solution relates to a method and an apparatus in a communication system. The solution includes receiving as an input a frame including of a set of data symbols and reference symbols, each data symbol forming a rectangular symbol constellation of samples, derotating the first symbol of the set on the basis of the reference symbols, and setting phase rotating angle of the first symbol as zero. The solution further includes for each following successive symbol in the set of symbols: performing equalization; reducing the number of samples in the constellation by selecting samples in two or more corners of the constellation by utilizing two or more threshold values; estimating the phase rotating angle of the symbol from the reduced number of samples and derotating the symbol on the basis of the determined phase rotating angle.

5G and especially 6G are susceptible to phase faults due to rapid phase fluctuations, usually in the local oscillator of the user device. Low-cost IoT applications that 6G is intended to serve may be impractical unless phase noise mitigation can be applied on each uplink and downlink message. Accordingly, a single-branch phase-tracking reference is disclosed occupying just a single resource element, in which one quadrature branch is transmitted with a predetermined maximum modulation amplitude, and the other branch has zero amplitude. The receiver can then quantify the phase noise (or the phase rotation angle) according to a ratio of the as-received branch amplitudes, and mitigate a concurrent message by de-rotating each message element by the same phase angle, thereby restoring high reliability at high frequencies at negligible cost.

Methods, systems, and devices for wireless communications are described. A transmitting wireless device may identify different sets of bits that are included in information bits of a signal to be transmitted. For example, a first set of bits may be used as an index for a second set of bits, and the second set of bits may include multiple groups of bits, where each group may have a same size (e.g., a same quantity of bits). Based on the groups of bits having the same size, the transmitting wireless device may obtain candidate partial transmit sequences (PTSs) based on applying phase rotations to respective inverse Fast Fourier Transform (IFFT) outputs associated with each group of bits. The transmitting wireless device may select a PTS from the candidate PTSs and may transmit the signal including the information bits to a receiving wireless device using the selected PTS.

The present disclosure describes the generation of long sequences from short sequences to support concurrent transmissions of large numbers of machine-type communication devices operating in a wireless communication system. These long sequences may be assigned to devices so that the devices can use the long sequences scramble their transmissions. The use of such long sequences permits many machine-type communication devices to transmit during the same time and frequency resource.

A method includes: determining a plurality of first subcarrier data items on a plurality of first subcarriers of a first frequency subband; performing first phase rotation on each first subcarrier data item based on a mixing frequency and a first reference frequency corresponding to the first frequency subband; determining a to-be-transmitted signal based on a plurality of first subcarrier data items obtained through first phase rotation; and sending the to-be-transmitted signal. In this way, phase rotation can be performed based on at least the first reference frequency, so that modulation can be correctly implemented without a need to know a mixing frequency of a receiving end. In addition, there is no need to notify the receiving end of the used mixing frequency, and the receiving end can correctly demodulate a received signal even if the receiving end does not know the mixing frequency.

In 5G-Advanced and 6G, due to the higher frequencies involved, phase noise is expected to be a major source of faults. Disclosed herein is a small (single resource element) phase-tracking reference signal that also provides an updated amplitude calibration. The compact phase-tracking reference signal, in QAM, includes a first branch at a maximum amplitude and an orthogonal second branch at either the maximum amplitude or zero amplitude, as transmitted. The receiver can readily determine a phase rotation angle according to a ratio of the two branch amplitudes, and also an amplitude calibration according to the vector magnitude of the received branches, thereby negating both amplitude noise and phase noise.

A phase ambiguity processing method and device are provided. The phase ambiguity processing method includes: deciding symbols on a Y polarization state and an X polarization state of a received signal, and mapping to obtain first bit information, where the received signal includes a plurality of first signals; checking and analyzing the first bit information to generate a first check result; judging the first check result to obtain a judgment result as to whether the received signal has phase ambiguity; acquiring at least one of the plurality of first signals in the received signal when the judgment result indicates that the received signal has phase ambiguity; performing phase rotation on the first signal to obtain a second signal; and checking and analyzing the second signal, storing the second signal so that the first signal is replaced with the second signal for decoding processing if a check result is normal.