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Channel estimation device, method and user equipment

A channel estimation and user equipment technology, applied in the field of communication, can solve problems such as transmission layer interlayer interference, system performance degradation, channel estimation accuracy reduction, etc., to achieve the effect of eliminating interlayer interference, improving accuracy and system performance

Inactive Publication Date: 2016-07-06
FUJITSU LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the inventors found that the defect of the existing technology is that: the initial channel response of the UE-specific reference signal not only includes the estimation errors of other resource elements in the signal group, but also includes layers from other transmission layers overlapping with the target downlink transmission layer Interference
At present, traditional methods such as linear interpolation or classical minimum mean square error (MMSE, Minimum Mean Squared Error) filtering do not include the processing of the interference for channel response estimation at data information resource particles, so UE-specific reference signal initial channel response The interlayer interference contained will inevitably lead to the reduction of channel estimation accuracy and the degradation of system performance

Method used

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  • Channel estimation device, method and user equipment
  • Channel estimation device, method and user equipment
  • Channel estimation device, method and user equipment

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Embodiment 1

[0050] An embodiment of the present invention provides a channel estimation device, image 3 is a schematic diagram of the structure of the channel estimation device according to the embodiment of the present invention. Such as image 3 As shown, the channel estimation device includes: a preprocessing unit 301, an interference cancellation unit 302, and a channel estimation unit 303;

[0051] Among them, the preprocessing unit 301 uses the pre-generated reference signal sequence to perform demultiplexing and despreading processing on the received signal, so as to extract the initial channel response information at the resource element occupied by the reference signal in the downlink transmission layer that is superimposed together; interference elimination Unit 302 performs interference cancellation according to the interference cancellation matrix for eliminating interlayer interference and the initial channel response information, and obtains the channel response informatio...

Embodiment 2

[0073] An embodiment of the present invention provides a channel estimation device. On the basis of Embodiment 1, the interference cancellation matrix generated according to the statistical characteristics of the transmission channel is described in detail. Wherein, the same content as that of Embodiment 1 will not be repeated here.

[0074] Figure 4 It is another schematic diagram of the structure of the channel estimation device according to the embodiment of the present invention. Such as Figure 4 As shown, the channel estimation device includes: a preprocessing unit 401 , an interference cancellation unit 402 and a channel estimation unit 403 . In addition, the channel estimation apparatus may further include: a matrix calculation unit 404, configured to generate the interference cancellation matrix according to the statistical characteristics of the transmission channel.

[0075] In a specific implementation, the matrix calculation unit 404 may be specifically config...

Embodiment 3

[0086] The embodiment of the present invention also provides a channel estimation method, and the same content as the above-mentioned device will not be repeated here. Image 6 is a flowchart of a channel estimation method in an embodiment of the present invention, such as Image 6 As shown, the channel estimation method includes:

[0087] Step 601, using the pre-generated reference signal sequence to perform demultiplexing and despreading processing on the received signal, so as to extract the initial channel response information at the resource element occupied by the reference signal in the downlink transmission layer that is superimposed together;

[0088] Step 602, perform interference cancellation according to the interference cancellation matrix used to eliminate inter-layer interference and the initial channel response information, and obtain channel response information at the resource element occupied by the reference signal after interference cancellation;

[0089]...

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Abstract

PROBLEM TO BE SOLVED: To provide a channel estimation apparatus, a channel estimation method, and a user apparatus.SOLUTION: A channel estimation apparatus includes: a pre-processing part for extracting initial channel response information of a resource element occupied by overlapped reference signals on a downlink link transmission layer, by performing a demultiplexing and despread processing on a reception signal using a reference signal sequence generated beforehand; an interference elimination part for eliminating interference on the basis of an interference elimination matrix for eliminating interference between layers and the initial channel response information, and obtaining a channel response information of a resource element occupied by a reference signal after interference elimination; and a channel estimation part for estimating a channel response of a resource element occupied by downlink transmission data, on the basis of the channel response information of the resource element occupied by the reference signal after interference elimination.

Description

technical field [0001] The present invention relates to the communication field, in particular to a channel estimation device, method and user equipment in an LTE-Advanced system. Background technique [0002] 3GPP LTE-Advanced is currently the preferred technology for the fourth generation of mobile communications. To support downlink transmission with a peak rate of up to 1Gbps, the LTE-AdvancedR10 protocol uses beamforming and precoding technologies based on 8-port UE-specific reference signals (UE-specificReferenceSignals). At the receiving end of LTE-Advanced user equipment, in order to perform coherent detection, channel estimation techniques based on UE-specific reference signals are usually used to track and predict real-time changes in wireless transmission channels. [0003] In the LTE-AdvancedR10 protocol, the design of up to 8-port UE-specific reference signals not only adopts traditional frequency division multiplexing (FDM, frequency division multiplexing) and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 王晓琴王昕
Owner FUJITSU LTD