Aspects of the present disclosure describe a system and method for synchronizing time, frequency, and phase among a plurality of devices.

A reception apparatus includes: an interference estimation unit configured to estimate a frequency band of an interference signal in a reception signal on which the interference signal having a narrower frequency band than that of a transmission signal transmitted by a transmission apparatus is superimposed; a feedback unit configured to feed back the frequency band of the interference signal estimated by the interference estimation unit to the transmission apparatus; and a band synthesis unit configured to synthesize a plurality of sub-spectra in a frequency band corresponding to a plurality of sub-spectra decomposed by the transmission apparatus, and a transmission apparatus includes: a band division control unit configured to perform control for determining a band in which a transmission signal is divided based on the frequency band of the interference signal fed back from the reception apparatus; and a band division unit configured to band-divide the transmission signal into a plurality of sub-spectra so that the interference signal and the sub-spectra is partially superimposed, based on the band determined by the band division control unit.

A mobile station operable to perform cell synchronization is described. The mobile station can process one or more synchronization signals received in a downlink from one or more base stations providing coverage in one or more cells. The mobile station can process the one or more synchronization signals received from the one or more base stations to synchronize the mobile station with the one or more base stations. The mobile station can adjust signals for communication from the mobile station in accordance with the cell synchronization performed at the mobile station.

Carrier frequency offset (CFO) estimation is effected by transmission of contemporaneous bit patterns, detectable by a receiver. By analysis of periodicity of bit error occurrences at the receiver, a beating period caused by interference between the two transmitters can be identified. From this beating period, a measure of CFO can be obtained.

There is provided an apparatus, said apparatus comprising means for receiving from a network, at a user equipment, Doppler shift information associated with at least one cell of the network as a function of time for at least one area and using the Doppler shift information at the user equipment to compensate for the Doppler shift in communication with the network when the user equipment is in the at least one area.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for training and deploying machine-learned communication over RF channels. In some implementations, information is obtained. An encoder network is used to process the information and generate a first RF signal. The first RF signal is transmitted through a first channel. A second RF signal is determined that represents the first RF signal having been altered by transmission through the first channel. Transmission of the first RF signal is simulated over a second channel implementing a machine-learning network, the second channel representing a model of the first channel. A simulated RF signal that represents the first RF signal having been altered by simulated transmission through the second channel is determined. A measure of distance between the second RF signal and the simulated RF signal is calculated. The machine-learning network is updated using the measure of distance.

In at least one embodiment, a method for measuring a distance between a first communications device including a first local oscillator and a second communications device including a second local oscillator includes unwrapping N phase values to generate N unwrapped phase values. N is an integer greater than one. Each of the N phase values indicate an instantaneous phase of a received signal. The method includes averaging the N unwrapped phase values to generate an average phase value. The method includes wrapping the average phase value to generate a final phase measurement of the first local oscillator with respect to the second local oscillator.

The method of synchronizing data frames between 5G baseband processing stations by GPS-integrated local oscillator block control, including the following steps: step 1: synchronize the baseband processor's local oscillator block with the GPS's 1 pps pulse and generate a 10 ms pulse from the local oscillator; step 2: use the 10 ms synchronous pulse sync monitor block to get the sync offset between this pulse and the GPS 1 pps pulse; step 3: use the control algorithm to reconfigure the local oscillator so that the 10 ms synchronous pulse can follow the 1 pps GPS pulse.

A method for communicating between a first radio frequency communications device including a first local oscillator and a second radio frequency communications device including a second local oscillator includes generating phase values based on samples of a received signal. Each of the phase values indicates an instantaneous phase of the received signal. The method includes unwrapping the phase values to generate unwrapped phase values. The method includes generating frequency offset estimates based on the unwrapped phase values. The method includes generating an average frequency offset estimate based on the unwrapped phase values. The method includes wrapping the average frequency offset estimate to generate a residual frequency offset estimate. The method includes adjusting the first local oscillator based on the residual frequency offset estimate, thereby reducing a frequency offset between the first local oscillator and the second local oscillator.

The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data rate, after a 4G communication system such as an LTE system. The present invention relates to a method for guaranteeing a quality of a service in a wireless communication system. Specifically, a method for a base station according to an embodiment of the present invention comprises the steps of: receiving a PRACH from a terminal; identifying a transmission pattern of the PRACH for a symbol group including a plurality of symbols transmitted in a single tone; acquiring information of phase difference between tones, in which the PRACH has been received, according to multiple intervals between symbol groups on the basis of the transmission pattern of the PRACH; estimating a phase offset on the basis of the information of phase difference; and generating uplink timing information for transmission to the terminal, by using a timing offset converted from the estimated phase offset.