A Uplink Frequency Offset Estimation Method Applied to High Speed Rail System
A frequency offset estimation and high-speed rail technology, applied in the field of frequency offset estimation, can solve the problems of high algorithm complexity, long development cycle, and insufficient frequency estimation accuracy.
Active Publication Date: 2022-06-21
丽水青达科技合伙企业(有限合伙)
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[0005] 1) Compared with the current frequency offset estimation algorithm based on the pilot phase difference of two slots in the current LTE public network, the accuracy of frequency estimation is not high enough;
[0006] 2) In order to meet the requirement of multi-user simultaneous access, compared with the downlink signal frequency offset application, it is necessary to convert the signal from the time domain to the frequency domain in advance of the multi-user separation operation of each user signal, so the frequency offset estimation algorithm is complicated In addition, the current LTE high-speed rail communication is still dominated by low-frequency bands, and the interference of different systems is also relatively strong. In order to enhance the anti-interference ability, the combination of the cyclic prefix of as many time-domain symbols as possible and the phase difference of the respective repeated data is generally adopted Estimate the frequency offset, which causes the algorithm complexity of the frequency offset estimation module of the LTE uplink PUSCH signal in practical applications to be very high, the development cycle is long, and the use of existing public network equipment for technical upgrades also has great limitations
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[0017] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as recited in the appended claims.
[0018] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that the term "and / or" as...
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The present invention provides an uplink frequency offset estimation method applied to a high-speed rail system. In the scenario of a 4G LTE high-speed rail communication system, the received pilot signal is equalized and converted into A single frequency signal, and then use chirp Z transform to estimate the difference between the actual frequency and the ideal frequency of the single pilot to obtain the frequency offset estimation of the uplink PUSCH channel of the 4G LTE system.
Description
technical field [0001] The invention relates to the technical field of frequency offset estimation, in particular to an uplink frequency offset estimation method applied to a high-speed rail system. Background technique [0002] my country is already the country with the largest operating mileage of high-speed railways in the world, and the construction of high-speed railways will continue to develop and build. Therefore, the development of 4G LTE communication systems in the high-speed railway system has a very broad application space. As we all know, Doppler frequency offset estimation is a very critical technology in high-speed rail communication. [0003] There are two main sources of frequency offset: one is the frequency offset caused by the inconsistent local oscillator frequencies of the transceivers. This part of the frequency offset is only one between a pair of transceivers and is relatively stable, so it is easier to estimate and eliminate. The second is the Do...
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IPC IPC(8): H04L27/00H04L5/00
CPCH04L27/0014H04L5/0048H04L2027/0026
Inventor 王亮祝涛冯宇吴传炎
Owner 丽水青达科技合伙企业(有限合伙)