Provided are systems and methods for conversion and transmission of radio signals. A system for conversion and transmission of radio signals includes a frequency converter and a transmitter associated with a base station. The frequency converter is configured to receive, via a cable, a first radio signal having a predetermined frequency. The predetermined frequency is based on a Data over Cable Service Interface Specifications standard. The frequency converter is configured to convert the first radio signal into a second radio signal. The second radio signal has a frequency higher than the predetermined frequency. The transmitter is configured to wirelessly transmit the second radio signal to a customer premises equipment.

In one aspect, a radio device comprises: an analog front end (AFE) circuit to receive and process an incoming radio frequency (RF) signal comprising a packet; an analog-to-digital converter (ADC) coupled to the AFE circuit to receive and digitize the processed incoming RF signal into a digital signal; a detector coupled to the ADC to detect a carrier frequency offset (CFO) in the digital signal based at least in part on a preamble of the packet; and a controller coupled to the detector. The controller may generate a compensation value for the CFO based on the detected CFO and cause one or more components of the radio device to compensate for the CFO using the compensation value.

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 system may include a transmitter node and a receiver node. Each node may include a communications interface including at least one antenna element and a controller operatively coupled to the communications interface, the controller including one or more processors. Each node may be time synchronized to apply Doppler corrections to said node's own motions relative to a stationary common inertial reference frame. The stationary common inertial reference frame may be known to the transmitter node and the receiver node prior to the transmitter node transmitting signals to the receiver node and prior to the receiver node receiving the signals from the transmitter node.

A method includes calculating first correlation values corresponding to a first symbol duration based on input samples, the input samples being generated from a received signal; calculating phase differences respectively corresponding to the input samples based on the first correlation values and second correlation values corresponding to a second symbol duration preceding the first symbol duration; updating accumulative phase differences respectively corresponding to the input samples based on the phase differences; and detecting a symbol boundary based on the updated accumulative phase differences.

A reverse time synchronization may be performed between a sending device and a receiving device. Then a Time Error (TE) between the sending device and the receiving device may be determined based on the reverse time synchronization. A gate time on the receiving device may be scheduled based on the determined TE.

A method for a user equipment (UE) operating in a non-terrestrial network (NTN) is provided. The method includes receiving, from a base station (BS), assistance information; starting or restarting a timer upon receiving the assistance information; applying the assistance information to perform uplink synchronization; and determining that the UE has lost the uplink synchronization upon expiration of the timer.

The scheduling flexibility of CSI reference signals enables time and frequency synchronization using multiple non-zero CSI-RSs transmitted in the same subframe, or using CSI-RSs transmitted in the same subframe with other synchronization signals. Also, multiple synchronization signals may be scheduled in the same subframe to enable fine time and frequency synchronization without cell-specific reference signals.

A wireless communication method for use in a wireless terminal is disclosed. The wireless communication method comprises transmitting, to a wireless network node, a random access preamble selected from a plurality of predetermined preambles for a random access.

A wireless communication method for use in a wireless terminal is disclosed. The wireless communication method comprises determining at least one synchronization value based on at least one time stamp, and transmitting, to a wireless network node, a signal based on the at least one synchronization value.