Abstract:
A method includes: a transmit end transmits at least two mixed pilot signals to a receive end separately by using at least two physical antennas. The at least two mixed pilot signals are separately obtained after preset pilot signals corresponding to logical antennas in the at least two logical antennas are weighted by using a precoding weight matrix. The transmit sends a first codebook subset restriction instruction to the receive end. The first codebook subset restriction instruction carries a rank indication RANK and at least one precoding matrix index PMI. The transmit end receives a channel quality feedback message that is fed back by the receive end according to downlink channel quality of an equivalent channel of a specified antenna. Accordingly, a suitable serving antenna is selected for a receive end, thereby improving signal quality.
Abstract:
A communication method, a base station, and user equipment are provided. The method includes: forming m beams by using a manner of antenna weighting, where m is a positive integer greater than 1; determining an uplink receive power of each beam according to an uplink sounding signal of UE; selecting n beams from the m beams according to the uplink receive power of each beam, where n is a positive integer, and n
Abstract:
Embodiments of the present invention provide a digital predistortion processing method and a user terminal, which relate to the field of communications, and can simplify the structure of a digital predistortion apparatus and reduce the cost. The method includes: setting a control command; and tuning, when the control command is selecting a data collection mode as the working mode of a receive channel, the frequency of a local oscillator and the central frequency of a band-pass filter in the receive channel to the transmitting frequency of the user terminal, so that the user terminal performs predistortion factor update. The embodiments of the present invention are applied to the user terminal for digital predistortion processing.
Abstract:
The present disclosure disclose a method including: a transmit end transmits at least two mixed pilot signals to a receive end separately by using at least two physical antennas. The at least two mixed pilot signals are separately obtained after preset pilot signals corresponding to logical antennas in the at least two logical antennas are weighted by using a precoding weight matrix. The transmit sends a first codebook subset restriction instruction to the receive end. The first codebook subset restriction instruction carries a rank indication RANK and at least one precoding matrix index PMI. The transmit end receives a channel quality feedback message that is fed back by the receive end according to downlink channel quality of an equivalent channel of a specified antenna. According to the present invention, a suitable serving antenna is selected for a receive end, thereby improving signal quality.
Abstract:
Disclosed are a method, device and system for transmitting a Multi-user Multiple-Input-Multiple-Output (MU-MIMO) pilot and data. The method includes: when at least two terminals transmit a MU-MIMO pilot and data on one same time/frequency resource, constructing a k-stream SU-MIMO pilot and data; based on the configuration mode of the k-stream SU-MIMO pilot, modifying demodulation pilot port parameters of the at least two terminals; and based on the transmission mode of the k-stream SU-MIMO pilot and data, transmitting the k-stream SU-MIMO pilot and data to the at least two terminals, respectively. Further disclosed are a device and system for transmitting a MU-MIMO pilot and data
Abstract:
This application provides a sensor calibration method and an apparatus, and relates to the field of communication technologies, to improve sensor calibration efficiency. In the calibration method, a first data frame group is received from a first sensor; a second data frame group is received from a second sensor; whether the first data frame group and the second data frame group correspond to a same target group is determined; and if the first data frame group and the second data frame group correspond to the same target group, the second sensor may be calibrated based on the first data frame group and the second data frame group. In this way, a manner of automatically calibrating a sensor is provided, and manual intervention is not required. This improves sensor calibration efficiency.
Abstract:
This application discloses signal processing methods and apparatuses, in the field of radar technologies, and may be applied to scenarios such as intelligent transportation (for example, intelligent transportation, assisted driving, or autonomous driving), a smart home, and a robot. In an example method, a first range time-domain signal of a first subband and a second range time-domain signal of a second subband adjacent to the first subband are obtained. The first range time-domain signal and the second range time-domain signal are synthesized and superposed to obtain a third range time-domain signal. A first peak point and a second peak point of the third range time-domain signal are obtained. A constant phase error θerr between the first range time-domain signal and the second range time-domain signal is obtained based on the first peak point and the second peak point.
Abstract:
The present invention discloses a power-on/off drive circuit and a method for controlling the power-on/off drive circuit, and belongs to the field of electronic technologies. The power-on/off drive circuit includes a load, a switch circuit, a relay, and a single-source drive circuit; one end of a coil in the relay and a first input end of the single-source drive circuit are separately connected to a positive electrode of a second external power supply, and the other end of the coil in the relay is connected to a second input end of the single-source drive circuit; and a first output end of the single-source drive circuit is connected to a second input end of the switch circuit, a second output end of the single-source drive circuit is connected to the output end of the switch circuit, and a third output end of the single-source drive circuit is connected to a negative electrode of the second external power supply. In the present invention, a volume of a power-on/off drive circuit is reduced.
Abstract:
This application provides a method for obtaining downlink channel information. The method includes: performing preceding weighting on M CSI-RSs of each of N sub-cycles, where each sub-cycle is a quantity of measurement pilot subframes for bearing and transmitting the M CSI-RSs; sending the M weighted CSI-RSs to UE; receiving M PMIs and M CQIs that are sent by the UE and that correspond to the M CSI-RSs, where the M PMIs and the M CQIs are obtained by the UE by separately measuring the M weighted CSI-RSs based on a set a rank 1 preceding codebooks corresponding to the predetermined antenna quantity; obtaining M signal-to-noise ratios of a downlink channel of the UE according to the M CQIs, obtaining M equivalent codebooks according to the M PMIs and weights of the preceding weighting; and obtaining a covariance matrix according to the M signal-to-noise ratios and the M equivalent codebooks.