Automatic frequency controller, and wireless communicating apparatus and method

Abstract

Automatic frequency controllers, automatic frequency control methods, wireless communication devices, and / or wireless communication methods are provided. The automatic frequency controllers for correcting a frequency offset between a base station and a terminal includes at least one processor communicatively coupled to a memory and configured to execute computer-readable instructions stored in thememory to obtain a phase estimate from a reference signal received from the base station; classify a downlink channel as a high speed train (HST) channel or a non-HST channel based on the phase estimate; adjust a loop gain according to the classified downlink channel; calculate a phase error based on the phase estimate and the loop gain; correct the frequency offset using the phase error; and communicate with the base station after correcting the frequency offset. Therefore, the automatic frequency controller can adjust the loop gain in the condition of the high speed train channel.

Description

[0001] [Cross-reference to related applications] [0002] This application claims the rights of Korean Patent Application No. 10-2016-0177947 filed with the Korean Intellectual Property Office on December 23, 2016, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] Some exemplary embodiments relate to wireless communications, and more particularly, to automatic frequency controllers for correcting frequency offsets between base stations and terminals, automatic frequency control methods, wireless communication devices including automatic frequency controllers, and and / or wireless communication methods. Background technique [0004] In a wireless communication system, a terminal uses a local oscillator to convert a radio frequency (radio frequency, RF) signal into a baseband signal, and since the local oscillator is independent from the base station, carrier frequency offset may occur. In addition, when there is relative mov...

AI Technical Summary

Problems solved by technology

In addition, when there is relative movement between the terminal and the base station, an additional frequency offset may occur due to the Doppler effect

Specifically, in a high-speed train (HST) environment, when a terminal passes between fixed base stations at high speed, the Doppler shift can change rapidly over time, and thus the reception performance may vary with frequency deteriorating due to offset

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