Various aspects described herein relate to calibrating transceiver impairment in wireless communications. Direct current (DC) components of one or more signals can be modified, using one or more configured DC components, for transmitting to a user equipment (UE) via a transmitter. A receiver can receive the one or more signals as transmitted via the transmitter. An impairment of at least one of the transmitter, the receiver, or a combination thereof, can be determined based at least in part on comparing the DC components of the one or more signals as received via the receiver to the one or more configured DC components. One or more components of at least one of the transmitter, the receiver, or a combination thereof can be adjusted to compensate for the impairment.

A terminal is disclosed including a receiver that receives configuration information indicating a gap offset in subframe units related to a measurement gap (MG), and a shift time shorter than one subframe and related to the MG. The terminal further includes a processor that determines a timing of the MG based on the gap offset and the shift time. In other aspects, a radio communication method for a terminal and a base station are also disclosed.

Disclosed are circuits and method for reducing or eliminating reference spurs in frequency synthesizers. In some implementations, a phase-locked loop (PLL) such as a Frac-N PLL of a frequency synthesizer can include a phase frequency detector (PFD) configured to receive a reference signal and a feedback signal. The PFD can be configured to generate a first signal representative of a phase difference between the reference signal and the feedback signal. The PLL can further include a compensation circuit configured to generate a compensation signal based on the first signal. The PLL can further includes a voltage-controlled oscillator (VCO) configured to generate an output signal based on the compensation signal. The compensation signal can include at least one feature for substantially eliminating one or more reference spurs associated with the PLL.

When using a plurality of antenna elements, calibration is performed appropriately, while preventing processing time from increasing. A base station apparatus has a plurality of antenna elements; a combiner configured to receive and combine downlink transmission signals, each including a reference signal, from monitor ports provided corresponding to the antenna elements; a channel estimator configured to estimate a channel of the reference signal for each of the antenna elements; and a calibration controller configured to calculate a calibration correction value to be applied to each of the antenna elements based upon channel estimation result.

The rise of the connected objects known as the “Internet of Things” (IoT) will rival past technological marvels. This application discloses a novel object control system for navigation of moving vehicles in country roads and freeways. The object control system uses roadside, lane lines, and center barrier stud Internet of Things (IoT) devices to assist the navigation. In mountainous terrains that stud IoT devices have no access to IoT network and GPS a relay or grandmaster IoT device at the top of the mountain is used to provide access to IoT network by stud IoT devices.

The disclosure discloses a synchronization method, which includes: sending first synchronization information carrying a Synchronization Signal (SS) and state information; receiving second synchronization information sent by a third terminal based on the first synchronization information after a first terminal has received synchronization information sent by a second terminal; under a condition the state information sent by the third terminal indicates that the third terminal enters a pre-synchronization state, determining receiving time information of the third terminal according to time domain resources used by transmission of the first synchronization information and receiving time information of the second terminal; sending third synchronization information, where the third synchronization information is used to trigger the third terminal to be synchronized with the first terminal; and synchronizing the first terminal with the third terminal according to the receiving time information of the third terminal. The disclosure also provides a synchronization apparatus, a network element, and a computer storage medium.

The present disclosure is directed to a system and method for measuring small frequency differences between two signals quickly and with high precision. In particular examples, an offset between two clock signals on a satellite can be accurately determined in a time period enabling rapid clock synchronization useful in position, navigation, and tracking (PNT) and satellite communications applications. The system and method may also be implemented in constellation of cooperative satellites or other space-borne and high-altitude assets, wherein a plurality of such assets are accurately time-synchronized and more accurate ensemble average calculations are enabled using two-way time transfer (TWTT) protocols. A particular application presently disclosed measurement and correction of very small frequency differences between an atomic clock signal and a tunable clock signal.

Embodiments of the present disclosure relate to wireless communication field and disclose a method for speed measurement and positioning and a terminal. The speed measurement and positioning method in the present disclosure applied to a receiving end comprises: when it is determined that the local oscillation frequency of the receiving end is the same as that of each transmitting end, receiving a test signal transmitted by at least one transmitting end; determining frequency difference between the frequency of the test signal and the local oscillation frequency of the receiving end; determining, according to the frequency difference, the relative speed between the receiving end and the transmitting end corresponding to the test signal; and determining, according to the determined relative speed and first position information of the transmitting end corresponding to the test signal, second position information of the receiving end relative to the transmitting end corresponding to the test signal.

The present invention relates to a wireless communication system and particularly to a method and a device therefor, the method comprising the steps of: detecting an SSB, the SSB comprising 15 kHz-granularity-based offset information; determining, on the basis of the 15 kHz-granularity-based offset information, a subcarrier offset used to identify the frequency position of a CORESET linked to the SSB; and monitoring, on the basis of the subcarrier offset, the CORESET linked to the SSB.

A method, an apparatus and a computer program product for enhancing reception of signals in a wireless communication system. A signal containing a frame including a plurality of symbols is received on an uplink communication channel. An angular position of at least one symbol in the plurality of symbols in a constellation of symbols is detected. The plurality of symbols include equalized symbols. An angular difference corresponding a phase error between the detected angular position of the symbol and an expected reference angular position in the constellation of symbols corresponding to an expected reference symbol corresponding to the received frame is determined. Using the determined phase error, a phase of the symbol is compensated.