Constellation point diversity-based frequency offset estimation method in 5G mobile communication system

Abstract

The invention discloses a constellation point diversity-based frequency offset estimation method in a 5G mobile communication system. The method comprises the following steps: 1, acquiring a time slotOFDM symbol; 2, carrying out divergence pre-compensation on OFDM symbols; 3, combining DMRS information of two time slots to carry out channel estimation and equalization on the OFDM symbol after divergence pre-compensation; and 4, estimating the frequency offset of the equalized OFDM symbol by using a constellation point diversity method. According to the invention, the problem that the DMRS only exists in one symbol in the prior art is overcome; according to the method, the problem of inaccurate frequency offset estimation caused by the fact that a channel value estimated by utilizing a DMRS cannot represent the channel condition of 14 OFDM symbols in one time slot is solved. The precision of frequency offset estimation is improved. Meanwhile, the defect that extra known training sequences need to be sent in the prior art is overcome. The occupation of bandwidth and power resources of the frequency offset estimation method in a 5G mobile communication system is reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a frequency offset estimation method based on constellation point diversity in a 5G mobile communication system in the field of mobile communication. The invention can be used for estimating the frequency offset of time slot OFDM symbols in 5G mobile communication. Background technique [0002] With the rapid development of the mobile Internet and the continuous evolution of new terminal forms, the demand for data services has shown exponential growth, and the fifth-generation mobile communication system has also kicked off. The 5G mobile communication system with flexible structure, high speed and low delay will bring a brand new experience to users. The key technology in 5G, Orthogonal Frequency Division Multiplexing (OFDM), has the characteristics of high data throughput transmission, high spectral efficiency, easy implementation, and resistance to frequency selec...

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Problems solved by technology

[0007] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art, and provide a frequency offset estimation method based on constellation point diversity in a 5G mobile communication system, which is used to solve the problem of sending additional known training sequences in the prior art, which will cause Waste of bandwidth and power resources, and it is not appropriate to send additional training sequences in 5G mobile communication systems. For DMRS, there is only one symbol. The channel value estimated by DMRS cannot represent the channel situation of 14 OFDM symbols in a time slot. , which further leads to inaccurate frequency offset estimation and increased bit error rate

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