CN116318463A - Method, system and device for correcting distorted channel response - Google Patents
Method, system and device for correcting distorted channel response Download PDFInfo
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Abstract
The application discloses a method, a system and a device for correcting distorted channel response, and relates to the field of signal transmission. In the scheme, an ideal channel and a distorted channel are constructed in advance; inputting the initial signals to an ideal channel and a distortion channel respectively to obtain corresponding ideal signals and distortion signals; and calculating a response sequence of the compensation system according to the ideal signal and the distortion signal, so that the distortion signal is input into the compensation system to obtain the ideal signal. Therefore, by means of the method, the response sequence of the compensation system for compensating the distortion signals can be obtained, so that inaccurate distortion signals are input into the compensation system during signal transmission, and accuracy in the signal transmission process can be improved.
Description
Technical Field
The present disclosure relates to the field of signal transmission, and in particular, to a method, system, and apparatus for correcting distorted channel response.
Background
In the signal transmission process (such as a voltage signal or a current signal), distortion phenomenon may occur in the signal transmission process due to interference of external factors or due to limitation of channels in a transmission device (such as a receiver), and thus the finally received and output signal is inaccurate.
Therefore, providing a method to compensate for the distorted signal, and further improve the reliability and accuracy of signal transmission is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a method, a system and a device for correcting distorted channel response, which can obtain a response sequence of a compensation system for compensating distorted signals, so that inaccurate distorted signals are input into the compensation system during signal transmission, and the accuracy in the signal transmission process is improved.
In order to solve the above technical problems, the present application provides a method for correcting distorted channel response, including:
pre-constructing an ideal channel and a distorted channel;
inputting initial signals to the ideal channel and the distorted channel respectively to obtain corresponding ideal signals and distorted signals;
and calculating a response sequence of a compensation system according to the ideal signal and the distortion signal, so that the ideal signal is obtained after the distortion signal is input into the compensation system.
Preferably, the pre-constructing the ideal channel includes:
the ideal channel is modeled using a filter.
Preferably, simulating an ideal channel using a filter includes:
the ideal channel is modeled using a bessel-thomson filter.
Preferably, inputting the initial signal into the ideal channel to obtain a corresponding ideal signal, including:
and convolving the initial signal with a unit impulse response sequence of the Bessel-Thomson filter to obtain the ideal signal.
Preferably, the distorted channel is a channel within a receiver that receives the initial signal.
Preferably, after calculating a response sequence of the compensation system from the ideal signal and the distortion signal, the method further comprises:
and calculating the filter coefficient corresponding to the compensation system according to the response sequence of the compensation system.
Preferably, the method further comprises:
converting the initial signal into an initial wavetable signal;
inputting the initial signal to the ideal channel and the distorted channel respectively to obtain a corresponding ideal signal and a distorted signal, including:
and inputting the initial wave table signal to the ideal channel and the distorted channel to obtain a corresponding ideal signal and a distorted signal.
Preferably, calculating a response sequence of the compensation system from the ideal signal and the distortion signal comprises:
a transfer function of the compensation system is calculated from the spectral density and the cross-spectral density of the ideal signal and the distorted signal.
In order to solve the above technical problem, the present application further provides a system for correcting distorted channel response, including:
a channel construction unit for constructing an ideal channel and a distorted channel in advance;
the signal generating unit is used for respectively inputting initial signals into the ideal channel and the distortion channel to obtain corresponding ideal signals and distortion signals;
and the compensation unit is used for calculating a response sequence of a compensation system according to the ideal signal and the distortion signal so that the ideal signal is obtained after the distortion signal is input into the compensation system.
In order to solve the above technical problem, the present application further provides an apparatus for correcting distorted channel response, including:
a memory for storing a computer program;
a processor for implementing the steps of the method of correcting distorted channel responses as described above when storing a computer program.
The application provides a method, a system and a device for correcting distorted channel response, and relates to the field of signal transmission. In the scheme, an ideal channel and a distorted channel are constructed in advance; inputting the initial signals to an ideal channel and a distortion channel respectively to obtain corresponding ideal signals and distortion signals; and calculating a response sequence of the compensation system according to the ideal signal and the distortion signal, so that the distortion signal is input into the compensation system to obtain the ideal signal. Therefore, by means of the method, the response sequence of the compensation system for compensating the distortion signals can be obtained, so that inaccurate distortion signals are input into the compensation system during signal transmission, and accuracy in the signal transmission process is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings needed in the prior art and embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for correcting distorted channel response provided in the present application;
FIG. 2 is a schematic diagram of one principle provided in the present application;
FIG. 3 is a schematic illustration of another principle provided in the present application;
FIG. 4 is a corresponding eye diagram provided in the present application when the initial signal is not compensated;
fig. 5 is a corresponding eye diagram after compensating an initial signal provided in the present application;
FIG. 6 is a diagram showing the difference between the spectrum after compensating the initial signal and the original uncompensated spectrum;
fig. 7 is a schematic diagram of a unit impulse response after compensating an initial signal provided in the present application;
FIG. 8 is a graph of a compensation system provided herein;
FIG. 9 is a block diagram of a system for correcting distorted channel responses provided herein;
fig. 10 is a block diagram of an apparatus for correcting distorted channel responses provided herein.
Detailed Description
The core of the application is to provide a method, a system and a device for correcting distorted channel response, which can obtain a response sequence of a compensation system for compensating distorted signals, so that inaccurate distorted signals are input into the compensation system during signal transmission, and the accuracy in the signal transmission process is improved.
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, fig. 1 is a flowchart of a method for correcting distorted channel response provided in the present application, where the method includes:
s11: pre-constructing an ideal channel and a distorted channel;
s12: inputting the initial signals to an ideal channel and a distortion channel respectively to obtain corresponding ideal signals and distortion signals;
s13: and calculating a response sequence of the compensation system according to the ideal signal and the distortion signal, so that the distortion signal is input into the compensation system to obtain the ideal signal.
In particular, when considering the prior art of transmitting signals, distortion of the signal output by the receiver may occur due to interference from external factors or due to channel limitations of the receiver itself.
For solving the technical problem, the design thought of the application is as follows: the design of a compensation system to compensate the distorted signal to obtain a compensated signal, which is closer to the ideal signal, and how to obtain the response sequence of the compensation system, so that the design of the compensation system according to the response sequence is a technical problem to be solved at present.
Specifically, referring to fig. 2, fig. 2 is a schematic diagram provided herein, wherein R (n) is an input signal, y (n) is an output signal after passing through a distortion channel and a compensation system, H (z) is a distortion channel, H c (z) is a compensation system, H d (z) as an ideal channel, the corresponding operational relationship is: h (z) H c (z)＝H d (z); the corresponding system response operations are: h (n) h c (n)＝h d (n) (h (n) is the response sequence of the distorted channel, h c (n) is the response sequence of the compensation system, h d (n) response sequence as ideal channel).
Further, referring to fig. 3, fig. 3 is a schematic diagram of another principle provided in the present application, when an initial signal is present, the initial signal is input to an ideal channel to obtain an ideal output signal y (n), and the initial signal is input to a distorted channel to obtain a corresponding distorted signal x (n), and the compensation system needs to satisfy that the distorted signal x (n) is input to the compensation system, and then the corresponding ideal signal y (n) can be obtained.
Therefore, in the method, a distortion channel and an ideal channel are constructed in advance, then initial signals are respectively input into the distortion channel and the ideal channel to respectively obtain the distortion signal and the ideal signal, and further analysis and operation are carried out based on the distortion signal and the ideal signal to calculate a response sequence of a corresponding compensation system.
The ideal channel and/or the distorted channel may be pre-constructed when calculating the response sequence of the compensation system, or may be a distorted channel or an ideal channel existing in the prior art, for example, the distorted channel may be a channel inside the transmission device, and the initial signal may be a signal source or a voltage signal or a current signal. The present application is not limited herein, particularly as the actual situation may suggest.
As a preferred embodiment, the distorted channel is a channel within the receiver that receives the original signal.
Specifically, when the receiver receives the initial signal, the receiver receives the initial signal through its own channel and outputs it through its own channel or processes the initial signal, and the receiver's own channel may cause distortion of the initial signal. For example, when the receiver is an oscilloscope, the signal displayed by the oscilloscope is distorted due to the limitation of the bandwidth of the oscilloscope channel when the initial signal is received and displayed by the oscilloscope. Therefore, if an ideal channel and/or a distorted channel exist in practical application, the ideal channel and/or the distorted channel can be directly used without reconstructing the ideal channel and/or the distorted channel, so that the step of constructing the channel can be saved.
In addition, the purpose of the compensation system calculated in the application is to solve the distortion phenomenon existing in some application scenes in the prior art, so when an ideal channel and/or a distorted channel existing in practical application are used, the channel is directly used, and when the corresponding compensation system is calculated, the matching degree is better when the compensation system is applied to the application scenes.
In summary, the method for correcting distorted channel response provided in the present application may obtain a response sequence of a compensation system for compensating a distorted signal, so that an inaccurate distorted signal is input into the compensation system during signal transmission, thereby improving accuracy in a signal transmission process.
Based on the above embodiments:
as a preferred embodiment, the pre-constructing of the ideal channel includes:
the ideal channel is simulated using a filter.
This embodiment is intended to define a specific implementation of constructing an ideal channel, considering that the prior art generally uses filters to implement the transmission and filtering functions of signals.
Thus, in designing an ideal channel, this application may be, but is not limited to, using a filter to achieve a simulation of the ideal channel.
Therefore, the simulation of the ideal channel can be realized by using the filter, and the simulation mode by using the filter is simple and easy to realize.
As a preferred embodiment, using a filter to simulate an ideal channel, comprises:
the ideal channel is modeled using a bessel-thomson filter.
The present embodiment is intended to define a specific implementation of a filter simulating an ideal channel, and specifically, but not limited to, a bessel-thomson filter is used, and specifically, the N-order expression of the bessel-thomson filter is:
wherein, the liquid crystal display device comprises a liquid crystal display device,
H a (s) is a system function of a Bessel-Thomson filter, d 0 、b k For the fixed parameters (as in the prior art, which is not described in detail herein), k is the order.
If the receiver is an oscilloscope, the four-order bessel-thomson filter is selected in consideration of the signal transmission protocol of the oscilloscope, and the expression of the corresponding four-order bessel-thomson filter is:
as a preferred embodiment, inputting the initial signal into the ideal channel to obtain the corresponding ideal signal includes:
the initial signal is convolved with a unit impulse response sequence of a Bessel-Thomson filter to obtain an ideal signal.
Specifically, when an ideal channel is simulated using a bessel-thomson filter, an initial signal is input to the bessel-thomson filter, and then the ideal signal is obtained.
Specifically, the specific calculation mode that the ideal signal can be obtained through the ideal channel is as follows: and carrying out convolution operation on the initial signal and a unit impulse response sequence of the Bessel-Thomson filter, and obtaining an ideal signal as a result.
As a preferred embodiment, after calculating the response sequence of the compensation system from the ideal signal and the distortion signal, it further comprises:
and calculating the filter coefficient corresponding to the compensation system according to the response sequence of the compensation system.
Specifically, after the above calculation results in the response sequence of the compensation system, how the staff designs (virtual) hardware implementation according to this response sequence is a technical problem that needs to be solved by this embodiment.
Therefore, in the present application, the filter coefficient corresponding to the compensation system is calculated according to the response sequence of the compensation system, so that a worker designs a corresponding software-form filter (which may also be understood as virtual hardware) and/or a hardware-form filter based on the calculated filter coefficient, and further applies the filter to a receiver with a distorted channel, so that compensation for the distorted signal can be achieved, and an accurate ideal signal can be obtained.
As a preferred embodiment, further comprising:
converting the initial signal into an initial wavetable signal;
inputting the initial signal to an ideal channel and a distorted channel respectively to obtain a corresponding ideal signal and a distorted signal, including:
and inputting the initial wave table signal into an ideal channel and a distorted channel to obtain a corresponding ideal signal and a distorted signal.
Specifically, when the response sequence of the compensation system is calculated by taking into account the analog signal and the corresponding filter coefficient corresponding to the response sequence of the compensation system is calculated, the method is closer to an actual application scene (when the method is actually applied, the method is generally calculated by using a digital signal), so that the method is convenient to apply to the actual scene (when the method is applied to the actual scene after the initial signal is converted into the initial wave table signal, the processing operation of the digital signal is more convenient to use computer software).
In order to solve the above technical problems, in the present application, after an initial signal is obtained, the initial signal may be further converted into an initial wave table signal, where the initial wave table signal corresponds to a waveform signal of a digital quantity, so that based on the initial wave table signal and a response sequence of an ideal channel and a distortion channel, a corresponding ideal signal and a distortion signal are calculated, and when a response sequence of a compensation system or a filter parameter is calculated, the method is closer to practical application (in practical application, the method is generally calculated by using a signal of a digital quantity), thereby being convenient to apply the method in the present application to a practical scene.
As a preferred embodiment, calculating a response sequence of the compensation system from the ideal signal and the distorted signal comprises:
the transfer function of the compensation system is calculated from the spectral density and the cross-spectral density of the ideal signal and the distorted signal.
In particular, when calculating the response sequence of the compensation system by means of wave table signals, the transfer function of the compensation system may be calculated by means of, but not limited to, using the spectral densities and inter-spectral densities of the ideal signal and the distorted signal.
Wherein, the spectral density and the cross spectral density of x (n) and y (n) are obtained by calculation, and the calculation formula is as follows:
wherein H (f) is the transfer function of the compensation system.
Here the cross spectral density operation uses the following formula:
wherein P is yx (f) For the cross spectral densities of x (n) and y (n), the x represents the conjugate, the FFT represents the fourier transform, the corresponding filter coefficients for the compensation systemThe (impulse response sequence) is calculated by inverse FFT, the calculation formula is as follows:
h c (n)＝IFFT[H(f)]；
wherein the IFFT represents an inverse fourier transform; after the filter coefficient is obtained, the compensated signal can be obtained through convolution operation of the initial wave table signal and the filter coefficient, and the calculation formula is as follows:
therefore, the mode in the application can calculate the response sequence and the filter coefficient corresponding to the compensation system, further calculate the compensated signal through the initial wave table signal and the filter coefficient, improve the reliability of signal transmission, and calculate the transfer function of the compensation system by using the cross spectral density and the spectral density in the embodiment, so that the calculation mode is simple and reliable.
Referring to fig. 4 to fig. 7, fig. 4 is an eye diagram corresponding to an initial signal provided by the present application when the initial signal is not compensated, fig. 5 is an eye diagram corresponding to an initial signal provided by the present application after the initial signal is compensated, and fig. 6 is a schematic diagram of a difference between a spectrum provided by the present application after the initial signal is compensated and an original uncompensated spectrum, so that by the compensation system in the present application, a corresponding compensated channel can be seen to be significantly improved compared with an original channel. Fig. 7 is a schematic diagram of a unit impulse response after compensating an initial signal provided by the present application, and fig. 8 is a spectrogram of a compensating system provided by the present application. Therefore, after the initial signal passes through the compensation system in the application to compensate the initial signal, the system response of the original distorted channel can be optimized to reach the response of the ideal channel as much as possible, and the compensation system in the application can achieve the purpose of correcting the distorted channel.
Referring to fig. 9, fig. 9 is a block diagram of a system for correcting distorted channel responses provided in the present application, where the system includes:
a channel construction unit 91 for constructing an ideal channel and a distorted channel in advance;
a signal generating unit 92 for inputting the initial signal to the ideal channel and the distorted channel, respectively, to obtain a corresponding ideal signal and distorted signal;
and the compensation unit 93 is used for calculating a response sequence of the compensation system according to the ideal signal and the distortion signal so that the distortion signal is input into the compensation system to obtain the ideal signal. For an introduction of the system for correcting distorted channel responses, refer to the above embodiments, and the description is omitted herein.
Referring to fig. 10, fig. 10 is a block diagram of an apparatus for correcting distorted channel response provided in the present application, where the apparatus includes:
a memory 101 for storing a computer program;
a processor 102 for implementing the steps of the method of correcting distorted channel responses as described above when storing a computer program. For an apparatus for correcting distorted channel response, refer to the above embodiments, and the description is omitted herein.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of correcting distorted channel responses, comprising:
pre-constructing an ideal channel and a distorted channel;
inputting initial signals to the ideal channel and the distorted channel respectively to obtain corresponding ideal signals and distorted signals;
and calculating a response sequence of a compensation system according to the ideal signal and the distortion signal, so that the ideal signal is obtained after the distortion signal is input into the compensation system.
2. The method of correcting distorted channel responses according to claim 1, wherein constructing an ideal channel in advance comprises:
the ideal channel is modeled using a filter.
3. The method of correcting for distorted channel responses of claim 2, wherein modeling an ideal channel using a filter comprises:
the ideal channel is modeled using a bessel-thomson filter.
4. A method of correcting for distorted channel responses as defined in claim 3, wherein inputting an initial signal into the ideal channel to obtain a corresponding ideal signal comprises:
and convolving the initial signal with a unit impulse response sequence of the Bessel-Thomson filter to obtain the ideal signal.
5. A method of correcting a distorted channel response according to claim 1, wherein the distorted channel is a channel within a receiver that receives the initial signal.
6. The method of correcting a distorted channel response according to claim 1, further comprising, after calculating a response sequence of a compensation system from the ideal signal and the distorted signal:
and calculating the filter coefficient corresponding to the compensation system according to the response sequence of the compensation system.
7. A method of correcting distorted channel responses according to any one of claims 1-6, further comprising:
converting the initial signal into an initial wavetable signal;
inputting the initial signal to the ideal channel and the distorted channel respectively to obtain a corresponding ideal signal and a distorted signal, including:
and inputting the initial wave table signal to the ideal channel and the distorted channel to obtain a corresponding ideal signal and a distorted signal.
8. The method of correcting a distorted channel response of claim 7, wherein calculating a response sequence of a compensation system from the ideal signal and the distorted signal comprises:
a transfer function of the compensation system is calculated from the spectral density and the cross-spectral density of the ideal signal and the distorted signal.
9. A system for correcting distorted channel responses, comprising:
a channel construction unit for constructing an ideal channel and a distorted channel in advance;
the signal generating unit is used for respectively inputting initial signals into the ideal channel and the distortion channel to obtain corresponding ideal signals and distortion signals;
and the compensation unit is used for calculating a response sequence of a compensation system according to the ideal signal and the distortion signal so that the ideal signal is obtained after the distortion signal is input into the compensation system.
10. An apparatus for correcting distorted channel responses, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method of correcting distorted channel responses according to any of claims 1-8 when storing a computer program.
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| CN115174330A (en) * | 2022-06-22 | 2022-10-11 | 苏州大学 | Compensation method for distorted signals of multi-carrier access network and nonlinear equalizer |
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| US6519344B1 (en) * | 1998-09-30 | 2003-02-11 | Pioneer Corporation | Audio system |
| CN1832355A (en) * | 2005-03-07 | 2006-09-13 | 富士通株式会社 | Distortion compensation apparatus |
| US20160134248A1 (en) * | 2013-06-03 | 2016-05-12 | Sumitomo Electric Industries, Ltd. | Distortion compensation apparatus and wireless communication apparatus |
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