Frequency offset compensation method and device

Abstract

The invention discloses a frequency offset compensation method and device. The method comprises steps that terminal equipment triggers frequency calibration of a reference clock of the equipment according to the current receiving link frequency offset fo when monitoring that the terminal is in a static state, and obtains a current reference clock frequency offset value fc; when the terminal equipment receives data, receiving frequency offset estimation is carried out according to the received pilot frequency or demodulation reference signal to obtain a current receiving link frequency offset fo; a current receiving frequency offset compensation value and a sending frequency offset compensation value are calculated by utilizing the current reference clock frequency offset value fc and the receiving link frequency offset fo; and the terminal equipment performs frequency offset compensation on the data on the corresponding link by using the current receiving frequency offset compensationvalue and the sending frequency offset compensation value. By adopting the method, a Doppler frequency shift problem in a high-speed environment can be effectively solved, implementation cost is low,and implementation is easy.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a frequency offset compensation method and device. Background technique [0002] With the development of society and mobile communication, there are also requirements for communication in a high-speed environment. Usually, the clock of the terminal is locked on the downlink pilot of the base station. For high-speed scenarios, the uplink signal will reach the base station with twice the Doppler frequency deviation (such as figure 1 shown), resulting in unavailable links during high-speed mobile communications. [0003] The supported movement speed of 5G planning is 500km / h. For higher speed communication (such as aircraft and ground communication), the speed can reach up to 1200km / h, which cannot be supported by the current 4G / 5G air interface standards. Aiming at this problem, the following solutions are currently proposed. [0004] One is to introduce a highly stable referen...

AI Technical Summary

Problems solved by technology

Usually, the clock of the terminal is locked on the downlink pilot of the base station. For high-speed scenarios, the uplink signal will reach the base station with twice the Doppler frequency deviation (such as figure 1 shown), resulting in link unavailability during high-speed mobile communication

[0003] The supported movement speed of 5G planning is 500km / h. For higher-speed communication (such as aircraft and ground communication), the speed can reach up to 1200km / h. The current 4G / 5G air interface standards cannot support it.

If the GPSDO solution is adopted, the terminal needs to install a GPS antenna or obtain a GPS reference clock source, which will lead to complex terminal design and increased cost

[0008] The above-mentioned second solution needs to obtain the terminal’s position, speed and base station’s position. On the one hand, the design of the terminal will be complicated; on the other hand, when the system adds a new base station, if the corresponding system data is not updated in time, it will Cause the original solution of the terminal to fail, therefore, it will also cause difficulties in the implementation of the solution

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