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Channel equalization method and device and channel estimation method and a device

A channel estimation and channel equalization technology, applied in the field of communication, can solve the problems of poor equalization performance and timely adjustment of channels, and achieve the effect of reducing implementation complexity and achieving good equalization performance.

Active Publication Date: 2009-08-26
BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this channel equalization device and method using a single structure cannot make timely adjustments according to channel changes, and cannot provide better equalization performance under various channels.

Method used

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  • Channel equalization method and device and channel estimation method and a device
  • Channel equalization method and device and channel estimation method and a device
  • Channel equalization method and device and channel estimation method and a device

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Experimental program
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Embodiment 1

[0080] refer to figure 2 , is a flowchart of a channel equalization method described in Embodiment 1.

[0081] This embodiment is a two-dimensional channel adaptive equalization method, which adapts to different channels by presetting several channel estimators in the frequency direction. Wherein, the two-dimensional refers to performing channel estimation in the time direction and the frequency direction respectively; the self-adapting refers to that different channel estimators can be selected in real time to perform channel estimation according to the needs during the equalization process, and the channel of the system can be obtained. response.

[0082] The detailed processing flow of this embodiment is as follows:

[0083] S201. Perform channel estimation in the time direction by using the pilot signal in the received symbol, and obtain a channel response after channel estimation in the time direction;

[0084] In digital communication, symbols with the same time inte...

Embodiment 2

[0115] In this embodiment, the channel equalization method is used in the European terrestrial digital television broadcasting system to further describe the present invention in detail.

[0116] refer to image 3 , is a flow chart of the second embodiment using the channel equalization method in the European terrestrial digital television broadcasting system.

[0117] The pattern of the pilot signal in the known European terrestrial digital television broadcasting system is as follows Figure 4 As shown, the interval in the time direction is 4 symbols, and the interval in the frequency direction is 12 symbols.

[0118] S301, use the pilot signal in the received symbol to perform channel estimation in the time direction, and obtain the channel response H after channel estimation in the time direction p (k);

[0119] The first step is to configure the interpolation coefficient;

[0120] In this embodiment, a high-order interpolation algorithm in the time direction is used, ...

Embodiment 3

[0156] On the basis of the above channel equalization method, the present invention also provides a channel estimation method.

[0157] refer to Figure 7 , is a flow chart of a channel estimation method described in the third embodiment.

[0158] This embodiment is a two-dimensional forward adaptive channel estimation method.

[0159] S701. Perform channel estimation in the time direction by using the pilot signal in the received symbol, and obtain a channel response after channel estimation in the time direction;

[0160] In this embodiment, a high-order interpolation algorithm in the time direction is used for channel estimation, specifically:

[0161] The first step is to configure the interpolation coefficient;

[0162] The second step is to use the pilot signal in the received symbol to obtain the channel response of the subcarrier position where the pilot signal is located in the time direction;

[0163] The third step is to use the interpolation coefficients to per...

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Abstract

The invention provides a channel equalization method and a device which can provide better equalization performance to a communication system under diverse channels. The method comprises the following steps: carrying out channel estimation in the time direction by adopting pilot signals in receiving code elements to obtain channel response after channel estimation in the time direction; selecting one channel estimator in the frequency direction from a plurality of channel estimators in the frequency direction; carrying out channel estimation in the frequency direction to obtain channel response after channel estimation in the frequency direction by adopting the channel response after channel estimation in the time direction and the selected channel estimator in the frequency direction; using the channel response after channel estimation in the frequency direction as a channel estimate value; carrying out channel compensation on data signals in the receiving code elements by adopting the channel estimate value. The invention reduces the complexity of the system, cause the system to conduct timely adjustment according to the change of the channel and can more easily realize good equalization performance under diverse channels.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a channel equalization method and device, and a channel estimation method and device. Background technique [0002] In recent years, with the development of communication technology, channel equalization technology has been widely used in communication systems, mainly including digital telephone communication system, digital microwave communication system, satellite communication system, optical fiber communication system, digital mobile communication system and digital TV PA system, etc. [0003] Channel equalization refers to a process of reducing the amplitude, frequency and phase distortion in the channel in order to improve the transmission performance. In a communication system, in order to ensure the accurate transmission of information, it is necessary to perform channel equalization on the received signal, and compensate the influence of the channel on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
Inventor 黄晓
Owner BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD