Within a radio, a broadband digitizer is configured for channel assessment. In an example, a radio band is digitized to form a data stream. The data stream is channelized to form first and second in-phase in-quadrature (I/Q) sample streams. The first and second I/Q sample streams are provided to first and second channel assessors, respectively. Additionally, the first and second I/Q sample streams are bifurcated, to thereby provide the same first and second I/Q streams to first and second channel decoders, respectively. Accordingly, same portions of the first and second I/Q sample streams are presented to the first and second channel assessors and the first and second decoders, respectively, at the same time. Based at least in part on the channel assessments made by the channel assessors, a channel plan with less radio frequency noise may be selected.

The disclosure relates to technology for compensating for I/Q imbalance. An apparatus includes I-path circuitry having a first analog filter configured to filter an I-path signal and Q-path circuitry having a second analog filter configured to filter a Q-path signal. An I/Q imbalance compensation circuit of the apparatus is configured to process digital versions of the I-path signal and the Q-path signal to compensate for mismatch between the I-path circuitry and the Q-path circuitry. A first circuit of the apparatus is configured to apply a coarse adjustment to at least one of the first analog filter or the second analog filter to reduce an initial mismatch between the I-path circuitry and the Q-path circuitry. The first circuit is configured to operate the I/Q imbalance compensation circuit to compensate for a residual mismatch between the I-path circuitry and the Q-path circuitry with the coarse adjustment applied.

Aspects include an apparatus and a method for performing Second Order Input Intercept Point (IIP2) calibration of a Digital-to-Analog (DAC) during a full-duplex mode receive operation. In some aspects, a plurality of correlation values are obtained, indicating an amount of IMD energy of an RF signal, wherein the correlation values are associated with IIP2DAC values of a DAC. In some aspects, the apparatus can calculate a mixer bias value, based on the correlation values, and adjust a bias value of a mixer according to the determined bias value. The apparatus can obtain the correlation values, calculate the bias value, and adjust the bias value of the mixer during the full-duplex mode receive operation. In some aspects, the apparatus can thus improve IIP2 of the mixer and reduce IMD energy in a receive signal, during the receive operation, without the need of standby or factory calibration.

An input signal has a desired signal component and an interfering signal component superimposed thereon. Interfering component estimation processing is applied to the input signal, obtaining as a result a filtered signal comprising a sequence of filtered data samples. The filtered signal is subtracted from the input signal obtaining as a result an output signal comprising a sequence of output data samples. The interfering component estimation processing applies conjugating processing to the input signal, providing a conjugated version of the input signal. An adaptive signal processing coefficient is computed and adaptive signal processing is applied to the conjugated version of the input signal using the adaptive processing coefficient.

A communication system includes a baseband circuit, a transmitting end circuit, and a receiving end circuit is disclosed. The transmitting end circuit includes a digital analog conversion circuit and a transmitting end filtering circuit. The receiving end circuit includes a receiving end amplifying circuit, a receiving end filtering circuit, and an analog digital conversion circuit. A first data signal is transmitted to the analog digital conversion circuit through the digital analog conversion circuit and the transmitting end filtering circuit, so that the baseband circuit obtains a first compensation parameter. A second data signal is transmitted to the receiving end filtering circuit, the receiving end amplifying circuit and the analog digital conversion circuit through the digital analog conversion circuit and the transmitting end filtering circuit, so that the baseband circuit obtains a second compensation parameter. The baseband circuit performs calibration according to the first and the second compensation parameter.

Techniques are described for avoiding contention between synchronization packets (for example, Institute of Electrical and Electronics Engineers (IEEE) 1588 Precision Time Protocol (PTP) synchronization packets) and in-phase and quadrature (IQ) packets communicated over a fronthaul network used in a radio access network (for example, a Fifth Generation (5G) radio access network).

One embodiment provides a system for detecting and reporting information associated with RF signals. The system obtains in-phase and quadrature (IQ) data of the RF signals received at a predetermined center frequency and computes statistics associated with time-dependent changes of the IQ data. Computing the statistics includes: placing IQ data points included in the IQ data into a plurality of bins in an IQ plane; computing, for each IQ data point, a change in position in the IQ plane between the IQ data point and a corresponding IQ data point recorded prior to a predetermined time interval; and computing, for each bin, an average change in position of IQ data points inside the bin. The system assembles a data packet to be transmitted over a bandwidth-limited communication channel. The data packet includes a small number of bits representing the computed statistics associated with the time-dependent changes of the IQ data.

The present disclosure provides a method for compensating an imbalance between an I path and a Q path of a receiver. The method includes: sending a cosine signal and a sine signal through a signal generator, transmitting the cosine signal and the sine signal in the I path and Q path respectively; calculating autocorrelation values of the I path and the Q path in the signal receiving direction; determining a comparison result of amplitudes of the cosine signal received by the I path and the sine signal received by the Q path according to the autocorrelation values; calculating an adjustment compensation value of an analog domain gain amplifier, and an amplitude value and a phase value in a digital domain according to the comparison result of amplitudes; and compensating and adjusting the signal according to the adjustment compensation value, the amplitude value and the phase value.

A 5th generation (5G) or pre-5G communication system for supporting a data transmission rate higher than that of a 4th generation (4G) communication system, such as long term evolution (LTE) is provided. The wireless communication system, includes a plurality of antennas for identifying a plurality of radio signal, a receiver for receiving the plurality of the radio signals via the plurality of the antennas, wherein the receiver may include a coupler circuit for coupling the plurality of the received signals to different signal paths, to generate a first coupling signal by summing the plurality of the received signals and a second coupling signal corresponding to a difference of the plurality of the received signals, and a beam generator for generating a plurality of beamformed signals based on in-phase signals and quadrature-phase signals corresponding to the first coupling signal and the second coupling signal.

A communication system includes a baseband circuit, a transmitting end circuit, and a receiving end circuit is disclosed. The transmitting end circuit includes a digital analog conversion circuit and a transmitting end filtering circuit. The receiving end circuit includes a receiving end amplifying circuit, a receiving end filtering circuit, and an analog digital conversion circuit. A first data signal is transmitted to the analog digital conversion circuit through the digital analog conversion circuit and the transmitting end filtering circuit, so that the baseband circuit obtains a first compensation parameter. A second data signal is transmitted to the receiving end filtering circuit, the receiving end amplifying circuit and the analog digital conversion circuit through the digital analog conversion circuit and the transmitting end filtering circuit, so that the baseband circuit obtains a second compensation parameter. The baseband circuit performs calibration according to the first and the second compensation parameter.