Frequency difference compensation method and device

Abstract

The invention provides a frequency difference compensation method and device, applied to a mobile terminal with a millimeter wave communication function. The method comprises the steps of A, collecting a current local frequency signal of the mobile terminal and a current transmission frequency signal of a pointing device in real time, performing subtraction operation on the current local frequencysignal and the current transmission frequency signal to acquire a current intermediate frequency signal, and performing spectral analysis on the current intermediate frequency signal to acquire a frequency difference; B, judging whether the frequency difference exceeds the local frequency, if yes, executing the step C, and otherwise, returning to the step A; and C, adjusting the current local frequency of the mobile terminal according to the frequency difference, so as to allow the frequency difference to be not more than the frequency difference tolerance, and returning to the step A. Basedon the method provided by the invention, the frequency difference is monitored and compensated in real time, so that the condition that the frequency difference is always in a certain tolerance is ensured, the Doppler frequency offset problem and the individual frequency difference problem existing in the high-speed rail environment millimeter wave communication are solved, and meanwhile, according to the method and the device provided by the invention, the Doppler spread problem and the vehicle body radiation problem are avoided.

Description

technical field [0001] The invention relates to the communication field, in particular to a frequency difference compensation method and device. Background technique [0002] At present, high-speed rail transit and the Internet have become an important part of life. The speed of high-speed rail is getting faster and faster, and the demand for mobile data transmission is growing explosively. Millimeter wave communication technology is considered by the industry to be the best solution for wireless broadband access in high-speed rail. Good way, it has the advantages of broadband communication, and at the same time, millimeter wave communication is connected through the vehicle-ground broadband, so there is no problem of excessive electromagnetic radiation caused by the unstable signal of the existing LTE communication. However, millimeter wave communication also faces problems in the high-speed rail environment, including: [0003] One: Doppler frequency deviation (frequency ...

AI Technical Summary

Problems solved by technology

[0003] One: Doppler frequency deviation (frequency difference) caused by high-speed movement

[0004] Two: Individual differences and frequency differences caused by time aging

However, the problem with method (1) is that the compensation is inaccurate because the sampling frequency in the sampling process is too high, and this processing method cannot solve the problem of Doppler spread caused by multipath in traditional communication.

The problem with method (2) is that this processing method does not compensate for Doppler, and it is also an inefficient processing method from the perspective of performance

[0006] For the frequency difference problem caused by individual differences and time aging, the satellite frequency calibration method is usually used to achieve the same frequency of the base station, and sometimes the manual frequency calibration method is also used; Tunnel, etc., the entire network coverage cannot be achieved through satellite frequency calibration, and the cost of manual frequency calibration is too high

[0007] For the above problems, no effective solution has been proposed

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