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Radio-frequency interference cancellation method and system

A radio frequency interference and self-interference technology, applied in the field of communication, can solve problems such as the inability to obtain α and θ values, and the difficulty in establishing self-interference signals

Active Publication Date: 2014-09-17
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0008] Although the existing radio frequency interference cancellation method can remove the self-interference signal to a certain extent, there are the following problems: when the gradient of the objective function does not exist or cannot be obtained at some search points, the optimal α will not be obtained and θ values, it is difficult to establish an estimated self-interference signal

Method used

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  • Radio-frequency interference cancellation method and system

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Embodiment 1

[0127] like figure 1 As shown, this embodiment provides a method for canceling radio frequency interference, including:

[0128] 101. Obtain a predicted search point. The predicted search point includes a preset characteristic parameter change amount, and the characteristic parameter change amount is the characteristic parameter change amount of the self-interference signal when the self-interference signal propagates from the local transmitting antenna to the local receiving antenna.

[0129] The self-interference signal is a transmission signal sent from the transmission antenna of the local end. When the transmission signal propagates to the reception antenna of the local end, it will interfere with the receiving antenna to receive the signal of interest sent by the remote end. Therefore, the transmission signal is the self-interference signal of the local end. Jamming signal. In step 101, the change amount of the characteristic parameter may be an amplitude attenuation a...

Embodiment 2

[0140] like figure 2 As shown, this embodiment provides a method for canceling radio frequency interference, including:

[0141] 201. Obtain a predicted search point. The predicted search point includes a preset characteristic parameter variation, and the characteristic parameter variation is the characteristic parameter variation of the self-interference signal when the self-interference signal propagates from the local transmitting antenna to the local receiving antenna.

[0142] 202. Select a predetermined number of test search points around the predicted search point.

[0143] 203. Using the characteristic parameters contained in the test search point as the characteristic parameters of the estimated self-interference signal, measure the energy E corresponding to the test search point, and the energy E is the self-interference signal and the estimated self-interference signal Energy after cancellation.

[0144] 204. Compare the energy E corresponding to the test search...

Embodiment 3

[0171] like image 3 As shown, this embodiment provides a method for canceling radio frequency interference, including:

[0172] 301. Obtain a predicted search point. The predicted search point includes a preset characteristic parameter change amount, and the characteristic parameter change amount is the characteristic parameter change amount of the self-interference signal when the self-interference signal propagates from the local transmitting antenna to the local receiving antenna.

[0173] 302. Select a predetermined number of test search points around the predicted search point.

[0174] 303. Using the characteristic parameters contained in the test search point as the characteristic parameters of the estimated self-interference signal, measure the energy E corresponding to the test search point, and the energy E is the self-interference signal and the estimated self-interference signal Energy after cancellation.

[0175] 304. Compare the energy E corresponding to the ...

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Abstract

The invention discloses a radio-frequency interference cancellation method which is characterized by selecting a plurality of test points around a preset prediction search point, determining corresponding test points having the minimum energy E so as to find gradient direction where the energy E reduces fastest, and obtaining an optimal search point. Therefore, according to the method in the invention, based on the plurality of test points for test, the gradient direction where the energy E reduces fastest can be determined without the limitation of objective function, and the case that at some search point, the gradient does not exist or cannot be obtained does not exist. An embodiment of the invention also discloses another radio-frequency interference cancellation method which is characterized by selecting regions, of which the number is predetermined, around the preset prediction search point; selecting test search points, of which the number is predetermined, in the regions; determining the gradient direction by utilizing the change of average values of the test search points; and determining the corresponding test point having the minimum energy E in the gradient direction so as to obtain the optimal search point, thereby improving the searching precision and reducing influence of noise interference on search results.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and system for canceling radio frequency interference. Background technique [0002] In a full-duplex system, since the frequencies of the transmitting signal and the receiving signal at the local end are similar, and the distance between the transmitting antenna and the receiving antenna is relatively close, when the receiving antenna at the local end receives the signal of interest sent by the remote end, the transmitting signal at the local end will be interfere with the signal of interest. Especially when the power difference between the transmitted signal and the signal of interest is large, the transmitted signal will cause strong interference to the signal of interest, so that the power of the signal received by the receiving antenna at the local end exceeds the dynamic range of AC and DC AD, resulting in AD saturation and blocking, affecting the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/12H04B17/00
Inventor 罗龙顾立宏吕林军韩波
Owner HUAWEI TECH CO LTD
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