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Broadband receiver nonlinear blind recognition and compensation method

A wideband receiver and compensation method technology, applied to the shaping network, baseband system components, electrical components and other directions in the transmitter/receiver, can solve the stability problem of the feedback system, limit the maximum bandwidth of the transmission signal, and affect the receiver. Dynamic receiving range and other issues, to achieve the effect of improving the ability to extract weak signals and improving the spurious-free dynamic range

Active Publication Date: 2014-07-16
成都电科慧安科技有限公司
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Problems solved by technology

The disadvantage of the power back-off method is that it seriously affects the dynamic receiving range of the receiver and at the same time sacrifices the transmission efficiency
The second is to use feedback technology to extract the distortion component in the nonlinear output signal, feed it back to the input terminal, and then perform inverse phase cancellation with the input signal to obtain the output signal after suppressing the nonlinear component, but there is a feedback in this method The stability of the system, while the signal delay in the transmission system limits the maximum bandwidth of the transmission signal
Therefore, the hardware implementation complexity of this method greatly limits its application

Method used

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  • Broadband receiver nonlinear blind recognition and compensation method

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Embodiment Construction

[0016] Step 1: The receiver receives an analog signal, which is distorted after being processed by the RF front end of the receiver and sampled by AD to obtain a distorted signal, which is composed of a linear component and a distortion component.

[0017] Step 2: Construct the Volterra compensation model, preset the initial value ω of the compensation parameter ω of the model 0 , assuming that the order of Volterra model D=3, then the compensation model output compensation signal is p(k)=v(k)ω 0 ,

[0018] where v(k)=[y 2 (k),y(k)y(k-1)...,y 3 (k),y 2 (k)y(k-1)...y 3 (k-1)], ω 0 =[ω 1 ,ω 2 ,ω 3 ,ω 4 ,ω 5 ,ω 6 ,ω 7 ] T =[1,0,0,0,0,0,0] T is the initial value of the model parameters, namely:

[0019] p(k)=ω 1 the y 2 (k)+ω 2 y(k)y(k-1)+ω 3 the y 2 (k-1)+ω 4 the y 3 (k)+ω 5 the y 2 (k)y(k-1)+ω 6 y(k)y 2 (k-1)+ω 7 the y 3 (k-1)

[0020] Then get the mixed signal s(k)=y(k)-p(k), where y(k) is the distorted signal and p(k) is the compensation signal.

...

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Abstract

The invention relates to the field of wireless monitoring, in particular to a broadband receiver nonlinear blind recognition and compensation method. In the method, a distorted signal is compensated for to obtain a mixed signal, a cost function of short-time energy information of distortion components in the mixed signal is worked out, the compensation parameter corresponding to the minimum distortion compensation is worked out, compensation parameters in the compensation model are updated, the steps are carried out repeatedly until the distortion components are well inhibited, and therefore the spurious-free dynamic range of the receiver is expanded, and the weak-signal extraction ability is improved as well.

Description

technical field [0001] The invention belongs to the field of radio monitoring, in particular to a nonlinear blind identification and compensation method for wideband receivers. Background technique [0002] Compared with the strong nonlinearity that may exist in the transmitter system, the nonlinearity of the receiver is weak. After the receiver receives the signal, it passes through analog devices such as amplifiers, filters, and mixers. When the signal passes through these analog devices, nonlinear distortion will occur. As a hybrid processing device, ADC (Analog-to-Digital Converter) is also an important source of nonlinearity in the receiver link. Signals passing through the ADC will generate distortion in the time domain, and harmonic distortion and intermodulation distortion in the frequency domain. One of the methods to reduce the non-linearity of the receiver is to select an ADC with faster speed, higher conversion accuracy, and larger spurious-free dynamic range. ...

Claims

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Application Information

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IPC IPC(8): H04B1/12H04L25/03
Inventor 李朝海黄超黄宇声董祥雷何子述李迅向波苏洲阳
Owner 成都电科慧安科技有限公司
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