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Adaptive non-linear filter based on laguerre structure

A nonlinear filter and adaptive technology, applied in the direction of adaptive network, impedance network, electrical components, etc., can solve the problems of insufficient memory capacity of delay units, increased complexity of adaptive process implementation, multiple delay units and filter coefficients, etc. , to achieve the effect of fewer orders, simple structure, and improved frequency selectivity

Inactive Publication Date: 2006-05-17
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Due to the delay unit z -1 memory deficits, and The coefficient is the same as e(k-i), which leads to the need for more delay units and filter coefficients to achieve a better narrowband interference suppression effect when this type of adaptive nonlinear filter is used for spread spectrum communication narrowband suppression, resulting in the adaptive process. Increased implementation complexity

Method used

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  • Adaptive non-linear filter based on laguerre structure
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  • Adaptive non-linear filter based on laguerre structure

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Embodiment

[0034] like figure 1 Shown, a kind of specific embodiment of the present invention is: a kind of adaptive nonlinear filter based on Laguerre structure, it is used for narrow-band interference suppression in the spread spectrum communication, its subtractor 1 is received signal z(k ) and the predicted value of the narrowband interference signal of the adaptive predictor 4 based on the Laguerre structure at the current moment Subtract to obtain the prediction / subtraction error signal e(k) after the narrowband interference is removed, and send it to a nonlinear unit for nonlinear processing to obtain the error signal e(k), and then the error signal e(k) and the predicted value of the narrowband interference signal at the current moment Send it to the front-end adder 3 for addition, and the result is used as the input signal z(k) of the current moment of the adaptive predictor 4; then use the error signal e(k) to update the tap weight vector W of the adaptive predictor 4=[w 0...

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Abstract

An adaptive nonlinear filter based on Laguerre structure is featured as obtaining the first stage of tap output signal by sending adaptive predictor input signal to delay unit for delaying, obtaining the second stage of tap output signal by sending said input signal to Laguerre delay unit with memory depth greater than 1, using Laguerre delay unit with memory depth greater than 1 as the third stage of tap output signal and after, sending each stage of tap output signal to their corresponding multiplier for multiplying their tapping coefficient than sending result to tap output adder for obtaining prediction value of current narrowband interference.

Description

Technical field [0001] The invention relates to an adaptive non-linear filter for suppressing narrow-band interference in spread spectrum communication. Background technique [0002] Spread spectrum communication is favored in the field of military communication due to its strong anti-interference ability, concealed information signal, easy encryption and arbitrary site selection, and easy networking. However, in modern high-tech warfare, the electromagnetic field of the electronic battlefield The environment is becoming more and more complex, and the interference is becoming more and more serious. In many cases, due to the limitation of the spread spectrum bandwidth, the spread spectrum gain alone is not enough to suppress the interference. Especially in the case of strong interference, other measures must be taken to further improve the spread spectrum communication. Anti-interference ability; With the rapid growth of mobile communication and personal communication service...

Claims

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Application Information

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IPC IPC(8): H03H21/00
Inventor 张家树黄高勇
Owner SOUTHWEST JIAOTONG UNIV
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