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Channel estimation method and device

A technology of channel estimation and channel impulse response, applied in the field of channel estimation methods and devices

Active Publication Date: 2015-08-12
BEIJING GUODIANTONG NETWORK TECH CO LTD +2
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Problems solved by technology

[0005] This application provides a channel estimation method and device, aiming to solve the problem of how to improve the performance of existing channel estimation algorithms

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Embodiment Construction

[0052] The embodiment of the present application discloses a channel estimation method and device, which can be applied in an OFDM system, and the purpose is to improve the performance of channel estimation in the OFDM system. Among them, such as figure 1 As shown, the channel to be estimated in the OFDM system has sparse characteristics in the time domain.

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0054] A channel estimation method disclosed in the embodiment of the present application, such as figure 2 shown, includi...

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Abstract

The invention provides a channel estimation method and device. Singular value decomposition is performed on an original observation matrix, according to a result of the singular value decomposition, a reconstructed observation matrix is obtained, sparsity is estimated, the sparsity is the number of nonzero elements in a union of a preset channel impulse response value and an index set omega, wherein omega is generated according to the reconstructed observation matrix and a preset residual vector, and finally, channel estimation is performed using the sparsity. Since the singular value decomposition has the characteristic of relatively strong noise robustness, the method and the device provided by the invention have relatively strong noise robustness, in addition, the method and the device can perform estimation of sparsity without the need to know the sparsity, and thus have relatively high practicability, and the channel estimation method and the device provided by the embodiment have relatively high performance.

Description

technical field [0001] The present application relates to the communication field, and in particular to a channel estimation method and device. Background technique [0002] In OFDM communication systems, accurate channel estimation methods are the basis for demodulation and equalization at the receiver. As an advanced technology, the channel estimation algorithm based on compressed sensing can complete channel estimation with less pilot frequency, and the estimation accuracy is high, so it has great practical significance. [0003] At present, in the channel estimation algorithm based on compressed sensing, the greedy reconstruction method is widely used, but the noise robustness of this method is not strong, and this method requires a known sparsity, so its practicability is not high. It can be seen from the above two problems that the performance of existing channel estimation algorithms is not high. [0004] Therefore, how to improve the performance of channel estimati...

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Application Information

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IPC IPC(8): H04L25/02H04L25/03H04L27/26
Inventor 王一蓉邓伟王艳茹范军丽郑越峰刘伟才刘凯明
Owner BEIJING GUODIANTONG NETWORK TECH CO LTD
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