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Channel estimation method and device based on OFDM (Orthogonal Frequency Division Multiplexing)

A channel estimation and channel technology, applied in the field of OFDM-based channel estimation methods and devices, can solve the problem of low performance and achieve the effect of improving channel estimation accuracy

Inactive Publication Date: 2010-08-18
大唐联诚信息系统技术有限公司
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Problems solved by technology

[0012] The purpose of the embodiment of the present application is to provide an OFDM-based channel estimation method and device to solve the problem of low performance of channel estimation using the LS algorithm in the case of low signal-to-noise ratio

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  • Channel estimation method and device based on OFDM (Orthogonal Frequency Division Multiplexing)

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no. 1 example

[0063] see figure 1 , is the flow chart of the first embodiment of the channel estimation method based on OFDM in this application:

[0064] Step 101: Calculate the initial channel estimation value of the received channel pilot signal through the least squares LS algorithm.

[0065] Step 102: padding the initial channel estimation value with zeros, and calculating the channel time domain response value of the zero-padding initial channel estimation value.

[0066] Specifically, it is judged whether the dimension of the initial channel estimation value is a power of 2, and if not, several zeros are inserted into the initial channel estimation value, so that the dimension of the initial channel estimation value becomes 2 Inverse Fast Fourier Transform (IFFT) calculation is performed on the initial channel estimation value after zero padding to obtain the channel time domain response value.

[0067] Step 103: Set to zero the taps whose tap power is smaller than the preset thres...

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Abstract

The embodiment of the invention discloses channel estimation method and device based on an OFDM (Orthogonal Frequency Division Multiplexing). The method comprises the following steps of: calculating an initial channel estimated value of received channel pilot signals by the least square (LS) algorithm; zeroizing the initial channel estimated value, and calculating the channel time domain response value of the zeroized initial channel estimated value; resetting taps of which the tap power is less than a preset threshold value in the channel time domain response value to obtain a denoised channel time domain response value; acquiring a channel frequency domain response value corresponding to the denoised channel time domain response value; and calculating the channel frequency domain response values of other signals except the pilot signals by the interpolation algorithm based on the channel frequency domain response value of the pilot signals. By denoising the channel time domain response based on the existing LS channel estimation, the embodiment of the invention improves the channel estimation accuracy of the OFDM system at a low signal-to-noise ratio, is easy to realize and correspondingly raises the speed of the channel estimation.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular to a channel estimation method and device based on OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing). Background technique [0002] OFDM technology divides the channel into several orthogonal sub-channels, converts high-speed data signals into parallel low-speed sub-data streams, and modulates them for transmission on each sub-channel. Orthogonal signals can be separated by using related technologies at the receiving end, so that Reduce mutual interference between sub-channels. In the OFDM system using OFDM technology, the channel estimation method based on the training sequence and the blind estimation method can be used for channel estimation. The estimation method based on the training sequence is to insert known information into the transmitted information, and then use the known information to recover at the rec...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 王鑫曹晏波李洪强董育新乔元新颜尧平
Owner 大唐联诚信息系统技术有限公司
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