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Estimation method for plurality of Doppler frequency offsets of OFDM (orthogonal frequency division multiplexing) system in high-speed mobile environment

A high-speed mobile, frequency offset estimation technology, applied in the field of OFDM system

Inactive Publication Date: 2013-03-13
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

The actual measurement shows that the existing mobile communication means are difficult to communicate effectively when the train is running at high speed

Method used

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  • Estimation method for plurality of Doppler frequency offsets of OFDM (orthogonal frequency division multiplexing) system in high-speed mobile environment
  • Estimation method for plurality of Doppler frequency offsets of OFDM (orthogonal frequency division multiplexing) system in high-speed mobile environment
  • Estimation method for plurality of Doppler frequency offsets of OFDM (orthogonal frequency division multiplexing) system in high-speed mobile environment

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Embodiment Construction

[0068] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0069] The multi-Doppler frequency offset estimation method under the high-speed mobile environment proposed by the present invention is mainly aimed at the downlink, including the following steps:

[0070] Set up a mobile relay terminal on a high-speed moving vehicle to forward the communication data between the base station and the mobile station. At this time, there are limited transmission paths between the base station and the mobile relay terminal, and each path corresponds to a different Doppler frequency. By analyzing the multi-Doppler frequency deviation between the base station and the mobile relay terminal, the multi-Doppler frequency deviation between the base station and the mobile station on the vehicle is obtained.

[0071] Specifically, it mainly includes:

[0072] In order t...

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Abstract

The invention discloses an estimation method for a plurality of Doppler frequency offsets of an OFDM (orthogonal frequency division multiplexing) system in a high-speed mobile environment. The estimation method comprises the following steps that: a mobile relay terminal is set on a high-speed mobile vehicle and used for forwarding communication data between a base station and a mobile station, at the time, transmission routes with a limited number exist between the base station and the mobile relay terminal, and each route corresponds to different Doppler frequency offsets; and a plurality of Doppler frequency offsets between the base station and the mobile station on the vehicle are obtained by analysing the plurality of Doppler frequency offsets between the base station and the mobile relay terminal. With the adoption of the method disclosed by the invention, estimation for the plurality of Doppler frequency offsets in the high-speed mobile environment is realized. Moreover, the greater a sub-carrier number Nc is, the smaller a mean square error under the same signal-to-noise ratio is, namely, the more accurate the estimation for the frequency offsets is. Because in the case that Nb is given, increase for the Nc is increase for Na essentially, and the Na is equal to the fast beat number of a signal, the accuracy of estimation for a covariance matrix Rd can be improved via the increase for the Nc, thus the estimation for the frequency offsets is more accurate.

Description

technical field [0001] The invention belongs to the technical field of OFDM systems, and relates to a multi-Doppler frequency offset estimation method of an OFDM system in a high-speed mobile environment. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology with higher spectral efficiency is recognized as the core technology of next-generation wireless broadband communication. In fact, the reason why OFDM technology has better spectrum utilization is that it divides the entire frequency band into several overlapping sub-bands (sub-carriers). In order to ensure that the overlapping sub-bands do not affect each other, it is essentially required Each subcarrier must be orthogonal. However, the frequency inconsistency between the transceiver systems will greatly damage the orthogonality between the subcarriers of the received signal, resulting in inter-carrier interference (ICI), which will cause a significant decline in the performance of ...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 穆鹏程殷勤业郭伟
Owner XI AN JIAOTONG UNIV
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