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Orthogonal frequency division multiplexing system channel estimation method and terminal

A channel estimation and orthogonal frequency division technology, which is applied in the field of channel estimation of orthogonal frequency division multiplexing systems, can solve the problems of discontinuity in the frequency domain, error of channel estimation value of edge subcarriers, and reduce user experience satisfaction, so as to reduce the Errors, improved performance, and the effect of improving user experience satisfaction

Inactive Publication Date: 2018-07-13
ZTE CORP
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  • Application Information

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Problems solved by technology

[0004] However, for the channel estimation value obtained by the above method, since the pilot signal received by the receiving end is a section of signal correspondingly intercepted from a continuous frequency domain channel, the two ends of the frequency domain are discontinuous, and the discrete Fourier transform When processing the inverse discrete Fourier transform, the final channel estimation value of the edge subcarriers will have a large error, which will seriously affect the performance of the entire OFDM system and reduce the satisfaction of the user experience.

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  • Orthogonal frequency division multiplexing system channel estimation method and terminal
  • Orthogonal frequency division multiplexing system channel estimation method and terminal
  • Orthogonal frequency division multiplexing system channel estimation method and terminal

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Embodiment 1

[0027] In order to avoid the problem that the channel estimation value error of edge subcarriers in the existing OFDM system channel estimation method is relatively large, and improve the performance of the OFDM system, the embodiment of the present invention provides a new Orthogonal frequency division multiplexing system channel estimation method, please refer to figure 1 , its testing process includes:

[0028] S101: Acquire a pilot signal for channel estimation;

[0029] S102: Process the pilot signal to obtain channel estimation values ​​of N subcarriers;

[0030] S103: Select channel estimation values ​​of edge subcarriers at both ends from the obtained channel estimation values ​​of N subcarriers, and select channel estimation values ​​of credible subcarriers from the remaining channel estimation values;

[0031] S104: Based on the channel estimation value of the selected trusted subcarrier, the channel estimation value of each edge subcarrier is reconstructed to obta...

Embodiment 2

[0053] see image 3 , image 3 A terminal that can implement the channel estimation method for the OFDM system shown in the first embodiment is provided for this embodiment, including:

[0054] The signal acquisition module 31 is configured to acquire a pilot signal for channel estimation.

[0055] The processing module 32 is used to process the pilot signal to obtain channel estimation values ​​of N subcarriers; and select channel estimation values ​​of edge subcarriers at both ends from the obtained channel estimation values ​​of N subcarriers, and obtain channel estimation values ​​from the remaining channel The channel estimation value of the credible subcarrier is selected from the estimated value.

[0056] The channel estimation value reconstruction replacement module 33 is used to reconstruct the channel estimation value of each edge subcarrier based on the channel estimation value of the trusted subcarrier selected by the processing module 32 to obtain the reconstruc...

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Abstract

The invention provides an orthogonal frequency division multiplexing system channel estimation method and a terminal. The orthogonal frequency division multiplexing system channel estimation method comprises the following steps: obtaining a pilot signal used for channel estimation; processing the pilot signal to obtain the channel estimation values of N subcarriers; selecting the channel estimation values of the two ends edge subcarriers from the obtained channel estimation values of the N subcarriers, and selecting the channel estimation value of a trusted subcarrier from the remaining channel estimation values; and reconstructing the channel estimation value of each edge subcarrier based on the channel estimation value of the selected trusted subcarrier to obtain the reconstructed channel estimation value of each edge subcarrier, and replacing the channel estimation value of each edge subcarrier with the corresponding reconstructed channel estimation value. Thus, the reconstruction of the channel estimation values with larger errors of the edge subcarriers is realized by means of the channel estimation value of the trusted subcarrier; therefore, the errors of the channel estimation values of the edge subcarriers are effectively reduced, the performance of orthogonal frequency division multiplexing system is improved, and user experience satisfaction is improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a channel estimation method and a terminal of an orthogonal frequency division multiplexing system. Background technique [0002] With the continuous development of wireless communication technology, the application of Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) system is becoming more and more popular. At the same time, the performance requirements for Orthogonal Frequency Division Multiplexing system are also increasing high. However, in OFDM systems, the accuracy of channel estimation will directly affect the performance of the entire system. [0003] Currently, the channel estimation method of the OFDM system is as follows: the transmitting end of the OFDM system places corresponding pilot signals on certain subcarriers and sends them to the receiving end. After the receiving end (such as some terminal...

Claims

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Application Information

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IPC IPC(8): H04L25/02
CPCH04L25/02H04L25/0204H04L25/0224H04L25/024
Inventor 陈海红
Owner ZTE CORP