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A method for estimating LTE residual carrier frequency deviation

A carrier frequency and deviation technology, applied in the field of estimating LTE residual carrier frequency deviation, can solve the problems of being easily affected by noise and low accuracy, and achieve the effect of excellent anti-noise performance and high estimation accuracy

Active Publication Date: 2022-03-04
WUHAN UNIV
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Problems solved by technology

[0006] The present invention proposes a method for estimating the LTE residual carrier frequency deviation by using a cell-specific reference signal, which is used to solve or at least partially solve the technical problems of low precision and susceptibility to noise in the existing methods.

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  • A method for estimating LTE residual carrier frequency deviation
  • A method for estimating LTE residual carrier frequency deviation
  • A method for estimating LTE residual carrier frequency deviation

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Embodiment Construction

[0046] In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following will be briefly introduced, and the drawings needed to be used in the existing technical description will be apparent, and the drawings in the following description are Some embodiments of the invention, for those of ordinary skill in the art, other drawings can also be obtained in accordance with these drawings without paying creative labor.

[0047] This example will be described in detail with a method of estimating the residual carrier frequency deviation using a cell-specific reference signal. When the example simulates the bandwidth of the downlink frequency division multiplexed LTE (FDD-LTE) signal, the cyclic prefix (CP) is configured to Normal, a single antenna configuration, 1 subframe containing 2 time slots, each time slot 7 OFDM symbols. Simulation transmitting end sample rate f s = 23.04 MHz, frequency interval f between subcarriers subcarrier =...

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Abstract

The present invention provides a method for estimating the LTE residual carrier frequency deviation. The present invention extracts L subframes from the LTE downlink signal and constructs a resource grid for each subframe; extracts a set of resource elements occupied by cell-specific reference signals on the resource grid of each subframe, and generates resources for each subframe at the receiving end The theoretical value set of the resource element occupied by the cell-specific reference signal on the grid; the resource element set occupied by the cell-specific reference signal on the resource grid of each subframe and the theoretical value set of the resource element are combined and calculated to further obtain each The phase sum in each subframe, and then estimate the relative carrier frequency deviation of each subframe according to the phase sum in each subframe; by calculating the average value of the relative carrier frequency deviation of multiple subframes, the estimation accuracy can be further improved and the influence of noise can be reduced. . The invention has higher precision and stronger anti-noise ability.

Description

Technical field [0001] The present invention relates to the field of wireless communication, and more particularly to a method of estimating the residual carrier frequency deviation of the LTE residual carrier. Background technique [0002] The multichannel technology used in Long Term Evolution (LTE) is an orthogonal frequency division multiple access (OFDMA) technology, which can be flexible through the terminal to flexibly allocate the number of corresponding subcarriers, which greatly enhances spectral efficiency. However, OFDMA technology is susceptible to the carrier frequency deviation. The carrier frequency deviation can break the orthogonality between the subcarriers, introduce the inter-carrier interference, and rotate the constellation phase of the subcarrier symbol, and this rotation phenomenon as the length of the received signal The growth is more and more serious, and the terminal is further difficult to solve the constellation chart of the subcarrier symbol, resul...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 万显荣但阳鹏易建新饶云华龚子平
Owner WUHAN UNIV