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Channel estimation method and system

A technology of channel estimation and estimated value, which is applied in the field of signal processing, can solve the problem that the bit error rate of the system needs to be improved, and achieve the effect of reducing the influence of noise

Inactive Publication Date: 2010-12-15
无锡端网云联科技有限公司
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Problems solved by technology

However, there is still a certain gap between the performance of LMMSE channel estimation and the ideal channel estimation, and the bit error rate of the system needs to be improved

Method used

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  • Channel estimation method and system
  • Channel estimation method and system

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Embodiment Construction

[0037] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] The present invention proposes a channel estimation method, which is improved on the basis of the existing LMMSE channel estimation method, thereby improving the accuracy of channel estimation.

[0039] Since the present invention is closely related to the existing LMMSE channel estimation method, in order to describe the improvement ideas and specific improvement methods of the present invention in detail, the following first introduces the existing LMMSE channel estimation method in detail.

[0040] First, the pilot refers to the cell-specific reference signal. The pilot-assisted channel estimation process is usually as follows: the receiving end first extracts the pilot signal from the received signal, and uses the pilot ...

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Abstract

The invention provides a channel estimation method and a channel estimation system to improve the accuracy of channel estimation. The method comprises the following steps of: calculating a channel response estimation value at a pilot signal position; performing iterative filtering on the channel response estimation value at the pilot signal position to obtain a final channel response estimation value at the pilot signal position; and estimating channel response estimation values of all subcarriers and symbols according to the final channel response estimation value at the pilot signal position. Through multiple iterations, the method and the system can reduce the influence of noise on the channel response estimation values so as to improve the accuracy of the channel estimation.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to a channel estimation method and system. Background technique [0002] As the LTE (LongTerm Evolution, Long Term Evolution) technology in the post-3G era of wireless networks, it has more advantages than 3G, such as: improving communication speed, spectrum efficiency, backward compatibility, and reducing delay. 3GPP (Third Generation Partnership Project) adopts OFDM (Orthogonal Frequency Division Multiplexing) in the downlink, which is Orthogonal Frequency Division Multiplexing technology. The sub-channels in OFDM technology are mutually orthogonal, thereby reducing the interference between carriers and eliminating Intersymbol interference is eliminated, and channel equalization after channel estimation is relatively easy. [0003] Generally, channel estimation methods can be classified into blind estimation methods and semi-blind estimation methods. Among them...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03H04L27/26
Inventor 张辉王西强宋磊王飒爽
Owner 无锡端网云联科技有限公司
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