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OFDM (Orthogonal Frequency Division Multiplexing) channel estimation method and device

A technology of channel estimation and pilot information, which is applied in the field of OFDM channel estimation methods and devices, can solve problems such as limited application and slow convergence speed, and achieve the effects of improving overall performance, reducing bit error rate, and improving anti-noise ability

Inactive Publication Date: 2011-06-01
ZTE CORP
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Problems solved by technology

[0003] The OFDM channel estimation algorithm is divided into blind channel estimation and pilot channel estimation according to whether pilot assistance is needed; because blind channel estimation does not require pilot assistance, the convergence speed is generally slow, which limits its application in practical systems

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  • OFDM (Orthogonal Frequency Division Multiplexing) channel estimation method and device
  • OFDM (Orthogonal Frequency Division Multiplexing) channel estimation method and device
  • OFDM (Orthogonal Frequency Division Multiplexing) channel estimation method and device

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Embodiment Construction

[0036] The main idea of ​​the present invention is to extract the real part and the imaginary part of the time domain impulse response of the noisy channel estimation after obtaining the channel estimation frequency domain impulse response and the time domain impulse response containing the noisy pilot bit, and the real part and the imaginary part After wavelet denoising processing is performed on the part respectively, the real part and the imaginary part of the channel estimation after denoising are combined to obtain the channel estimation value after wavelet denoising.

[0037] In order to achieve a better effect, the present invention can also perform windowing and denoising processing on the channel estimation value after wavelet denoising, thereby better estimating channel parameters.

[0038] The implementation of the technical solution will be further described in detail below in conjunction with the accompanying drawings.

[0039] refer to figure 1 Shown is a simple...

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Abstract

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) channel estimation method and device. The method comprises the following steps of: extracting pilot frequency information to obtain a channel estimation time domain shock response value containing a noise pilot frequency site; extracting a real part and an imaginary part of the channel estimation time domain shock response value containing the noise pilot frequency site; respectively carrying out wavelet denoising on the real part and the imaginary part of the channel estimation time domain shock response value containing the noise pilot frequency site; and combining the real part and the imaginary part of the wavelet denoised channel estimation time domain shock response value containing the noise pilot frequency site to obtain a denoised channel estimation time domain shock response value. The invention has the advantages of improving the anti-noise capacity of OFDM channel estimation, effectively reducing the error rate of the system, estimating a channel parameter with a high precision and improving the integral performance of the system.

Description

technical field [0001] The present invention relates to a signal processing method of a wireless communication system, in particular to an OFDM (Orthogonal Frequency Division Multiplex, Orthogonal Frequency Division Multiplexing) channel estimation method and device. Background technique [0002] OFDM technology is a special multi-carrier transmission scheme, which divides a wideband channel into multiple orthogonal narrowband flat fading channels to transmit data at the same time, and has the advantages of eliminating multipath interference, convenient adjustment of adaptive data rate, simple equalization process and spectrum The characteristics of high efficiency have been widely concerned and applied. In wireless communication systems, coherent detection has 3-4dB gain more than non-coherent detection, so coherent detection technology is usually used. Realizing coherent detection requires channel estimation at the receiving end, so channel estimation is one of the key te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 许月圆李萍雷杰
Owner ZTE CORP
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