Method and device for recovering line signal

Abstract

The invention discloses a method and a device for recovering line signals. The method comprises the following steps: determining signal attenuation data of a line according to a target signal received from the line; and configuring a working stage number of a feedback equalizer according to the signal attenuation data so as to enable a target feedback equalizer corresponding to the working stage number to perform signal compensation on the target signal. The working stage number of the equalizer can be adjusted in a self-adaptive mode, invalid work of the equalizer is avoided, and signal recovery errors are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of signal transmission, and in particular to a method and device for restoring line signals. Background Art

[0002] When a signal is transmitted over a long distance on a network cable, the shape of the signal will change due to the characteristics of the cable, resulting in overlap of the front and rear signals and inter-symbol interference. Currently, the forward feedback equalizer (FFE) is mainly used to eliminate forward interference, and the decision feedback equalizer (DFE) is used to eliminate backward interference. The two equalizers are combined to offset the tail amplitude to eliminate forward and backward tails.

[0003] The current solution recovers the data transmitted over a long cable by offsetting the amplitude of the forward or backward tail. This signal recovery method has limited effect, especially for signal transmission over a long cable. The tail may be as long as dozens of cycles (a complete cycle of the signal period). If you want to completely eliminate the tail, you need dozens of equalizers, which consumes a lot of resources. At the same time, since the current solution cannot achieve adaptive adjustment of the equalizer level and initial coefficient, if dozens of equalizers are introduced to solve the attenuation problem of long cables, then under the working conditions of short cables, many equalizer levels will not be used, which will cause the accumulation of errors at each level, resulting in reduced accuracy of the final decision. Summary of the invention

[0004] The present invention provides a method and device for recovering line signals, which can adaptively adjust the working level of an equalizer, avoid ineffective operation of the equalizer, and reduce signal recovery errors.

[0005] In one aspect of the present invention, a method for restoring a line signal is provided, the method comprising: determining signal attenuation data of the line according to a target signal received from the line; and configuring a working level of a feedback equalizer according to the signal attenuation data, so that a target feedback equalizer corresponding to the working level can perform signal compensation on the target signal.

[0006] In another aspect of the present invention, a device for restoring a line signal is provided. The device includes an equalization controller configured to determine signal attenuation data of the line according to a target signal received from the line, and configure the working level of the feedback equalizer according to the signal attenuation data, so as to enable the target feedback equalizer corresponding to the working level to perform signal compensation on the target signal; and a multi-level feedback equalizer electrically coupled to the equalization controller and configured to perform signal compensation on the target signal according to an enable signal.

[0007] According to the technical solution of the present invention, the signal attenuation data of the line is determined according to the target signal received from the line, so as to enable the necessary feedback equalizer to work according to the signal attenuation data, wherein enabling the feedback equalizer means enabling or activating the feedback equalizer. In order to achieve signal recovery for long lines, it is necessary to set a corresponding number of feedback equalizers to eliminate interference. However, due to the short line condition, some feedback equalizers do not work, resulting in the error of each level of feedback equalizer being affected by the first N levels of feedback equalizers. Therefore, under different line conditions, adaptive selection is made to enable different levels of feedback equalizers to work to avoid ineffective operation of the equalizer. When transmitting signals through long lines, all equalizers are enabled to work to completely eliminate tailing; when transmitting signals through short lines, only necessary equalizers are enabled to work to avoid error accumulation and mutual influence, thereby reducing errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a waveform diagram of the pulse signal after attenuation under different network cable lengths; Figure 2 A flowchart of a method for restoring a line signal according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the amplitude after a pulse signal is attenuated; Figure 4 A schematic diagram of the structure of a device for restoring line signals according to an embodiment of the present invention; Figure 5 A schematic diagram of an execution method of a balancing controller according to an embodiment of the present invention; Figure 6 The figure is a schematic diagram of the structure of a multi-stage feedback equalizer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0009] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0010] In the existing technology, the data transmitted by the long network cable is restored by offsetting the amplitude of the forward or backward tail. This signal recovery method has limited effect, especially for signal transmission under long network cables. The tail may be as long as dozens of cycles (a complete cycle of the signal period). If you want to completely eliminate the tail, you need to have dozens of equalizers, which consumes a lot of resources. At the same time, since the current solution cannot realize the adaptive adjustment of the equalizer level and initial coefficient, if dozens of equalizers are introduced to solve the attenuation problem of long network cables, then under the working conditions of short network cables, many equalizer levels will not be used, which will cause the accumulation of errors at each level, resulting in a decrease in the final judgment accuracy.

[0011] In view of the limited compensation effect of FFE and DFE equalizers on long network cables, a continuous time linear equalizer (CTLE) is added to compensate for the high-frequency part of the signal through CTLE. However, CTLE is a linear equalizer and will synchronously amplify the noise signal. Therefore, under the premise of ensuring that the noise signal is within the system's processing capacity, the FFE+DFE method is still used to restore the signal. The CTLE+FFE+DFE equalization solution can better restore the signal attenuation of long network cables.

[0012] In order to solve at least the above technical problems, the present disclosure provides a method for restoring line signals. According to the present disclosure, under different line attenuation conditions, feedback equalizers of different levels are adaptively selected to work to avoid ineffective operation of the equalizer. In this way, according to the embodiments of the present disclosure, when a signal is transmitted over a long line, a sufficient number of feedback equalizers can be enabled to work to completely eliminate the tail; at the same time, when a signal is transmitted over a short line, a necessary number of feedback equalizers can be enabled to work to avoid error accumulation and mutual influence of ineffective equalizers, thereby reducing errors.

[0013] According to the embodiments of the present disclosure, a technical solution is provided for controlling the working levels of FFE+DFE and setting the initial training coefficient value. Specifically, the equalizer controller can extract the attenuation of the network cable by analyzing the signal received from the network cable. The system enables the necessary working levels of the equalizer according to the attenuation of the signal, thereby avoiding the problem of introducing errors and increasing power consumption due to too many equalizer levels. In addition, the equalizer controller further adaptively sets the initial training coefficient value of each level of the equalizer by extracting the signal attenuation, instead of starting the training from 0 or a fixed value. By adaptively setting the initial training coefficient value, the adaptation speed can be accelerated, allowing the system to reach a stable state faster.

[0014] Hereinafter, the technical solution according to the present disclosure will be described with reference to specific embodiments and in conjunction with the accompanying drawings.

[0015] Figure 1 It is a schematic diagram showing the waveform of the pulse signal after attenuation under different network cable lengths. Figure 1 (a) is the waveform after the pulse signal attenuates under a short network line. Figure 1 (b) is the waveform after the pulse signal attenuates under a medium-length network cable. Figure 1 (c) in the figure is the waveform after the pulse signal attenuates under the long network line. Figure 1 As can be seen from the waveform diagram, the longer the network cable is, the lower the waveform amplitude is, and the more serious the front and rear tails are. The horizontal axis of each black dot in the waveform represents the position of the pulse signal clock cycle, and the vertical axis of each black dot represents the amplitude of the pulse signal in the current clock cycle. The equalizer system is used to eliminate the amplitude of the pulse signal in the clock cycle to eliminate the front and rear tails.

[0016] In order to ensure that the equalizer system can handle the signal attenuation problem of long network cables, the number of feedback equalizers turned on by the equalizer system needs to be more than that of short network cables to eliminate signal tailing, but due to the pipelined working mode of the feedback equalizer, the error of each level of feedback equalizer will be affected by the equalization result output by the first N levels of feedback equalizers. Under different network cable conditions, the optimal working mode of the equalizer system is: only the necessary feedback equalizer levels are turned on to work, avoiding the accumulation and mutual influence of errors, and avoiding the feedback equalizer that works invalidly from affecting the final judgment result. Therefore, the present invention analyzes the signal transmitted through the network cable, extracts the signal attenuation of the network cable, and the equalizer system enables the necessary equalizer working levels according to the attenuation of the signal, so that the equalizer system can work under optimal conditions. Among them, the inevitable sources of errors in the equalizer system when restoring the line signal include ADC sampling accuracy, data operation processing, such as saturation and truncation at multiple locations in the data stream, etc.

[0017] Figure 2 1 is a flow chart showing a method 100 for restoring a line signal according to an embodiment of the present disclosure. Figure 2 The method 100 includes the following steps 102 to 104.

[0018] In step 102, signal attenuation data of a line is determined based on a target signal received from the line.

[0019] In some embodiments, determining the signal attenuation data of the line according to the target signal received from the line includes: obtaining the final amplitude of the target signal after being transmitted through the line, and obtaining the signal attenuation data of the line by calculating the final amplitude of multiple cycles. In this way, since the signal attenuation amplitude caused by different network cable lengths is different, the attenuation data of the target signal after being transmitted through the line is determined by extracting the final amplitude after the signal is transmitted.

[0020] In some embodiments, obtaining the final amplitude of the target signal after transmission through the line includes: using a pre-configured continuous time linear equalizer to perform channel distortion compensation on the target signal to obtain the compensated signal amplitude as the final amplitude. In this way, since the feedback equalizer, i.e., the forward feedback equalizer and the decision feedback equalizer, has limited effect on signal compensation of long lines, it is impossible to compensate for the signal imbalance caused by the channel distortion of the long line. Therefore, before restoring the data transmitted by the long network line by offsetting the amplitude of the forward or backward tail, it is necessary to first compensate the high frequency part of the signal through the continuous time linear equalizer, and then perform signal recovery through the feedback equalizer to improve the effect of signal recovery.

[0021] In step 104, the working level of the feedback equalizer is configured according to the signal attenuation data, so that the target feedback equalizer corresponding to the working level can perform signal compensation on the target signal.

[0022] In some embodiments, configuring the working level of the feedback equalizer according to the signal attenuation data includes: determining the total length of the line based on the line simulation test results according to the signal attenuation data, and configuring the working level of the feedback equalizer according to the total length of the line. In this way, ideally, as the total length of the line increases, the number of feedback equalizer levels should be longer to eliminate longer tail amplitudes in the signal. In the case where the total length of the line is short, the signal itself does not have a very long tail amplitude. If the number of feedback equalizer levels is too large, not only errors are introduced, but also power consumption is increased. Therefore, the opening and closing of each level of feedback equalizer is determined according to the total length of the line, while ensuring the signal recovery effect, avoiding increasing errors and power consumption.

[0023] In some embodiments, configuring the working level of the feedback equalizer according to the total line length includes: obtaining the basic line length for each level of the feedback equalizer to perform signal compensation, determining a multiple value between the total line length and the basic line length, the multiple value being an integer, and configuring the working level of the feedback equalizer to the multiple value. In this way, the basic line length that can be compensated by each level of the feedback equalizer is first determined, and then the multiple value is determined by the basic line length and the total line length. The multiple value represents the linear relationship between the total line length and the working level enabled by the feedback equalizer. Therefore, the multiple value is set as the working level of the feedback equalizer, so that the device can adaptively start the corresponding level of feedback equalizer to perform signal compensation according to the total line length.

[0024] The opening or closing of each level of feedback equalizer needs to be combined with multiple factors such as the environment, the quality of the network cable, and the hardware conditions. The present invention comprehensively reflects multiple factors in the signal attenuation data of the line. In an application scenario, if the initial amplitude of the pulse signal is 1V when it is input into the network cable, and it decays to 0.8V after being transmitted through the network cable, it means that the current network cable length is shorter, so the equalizer system adaptively sets the working level to correspond to the shorter network cable. If the pulse signal decays to 0.4V after being transmitted through the network cable, it means that the current network cable length is medium, so the equalizer system adaptively sets the working level to correspond to the medium network cable. If the pulse signal decays to 0.1V after being transmitted through the network cable, it means that the current network cable length is longer, so the equalizer system adaptively sets the working level to correspond to the long network cable. Through simulation or actual measurement, it can be known that if the initial amplitude of the pulse signal input to the network cable is 1V, when the network cable length is 50m (the network cable length is short), the final amplitude after attenuation is 0.6V; when the network cable length is 100m (the network cable length is medium), the final amplitude after attenuation is 0.3V; when the network cable length is 150m (the network cable length is long), the final amplitude after attenuation is 0.18V. In this scenario, the initial amplitude of the pulse signal input to the network cable is 1V. When the final amplitude is 0.6V, the working level of the feedback equalizer is configured to 4, that is, the working level can be selected as 4 when the network cable length is short; when the final amplitude is 0.3V, the working level of the feedback equalizer is configured to 8, that is, the working level can be selected as 8 when the network cable length is short; when the final amplitude is 0.18V, the working level of the feedback equalizer is configured to 12, that is, the working level can be selected as 12 when the network cable length is short. In this way, the working level of the feedback equalizer is automatically selected based on the final amplitude of the pulse signal after attenuation.

[0025] If you want to more finely distinguish the correspondence between the attenuation amplitude and the working level of the feedback equalizer, you need to combine chip quality design.

[0026] In some embodiments, configuring the working level of the feedback equalizer according to the signal attenuation data includes: configuring the working level of the forward feedback equalizer and the working level of the decision feedback equalizer according to the signal attenuation data. In this way, forward interference is eliminated based on the forward feedback equalizer, and backward interference is eliminated based on the decision feedback equalizer.

[0027] In some embodiments, after configuring the working level of the feedback equalizer according to the signal attenuation data, the method may further include: configuring the initial coefficient value for tap coefficient training of each level of the target feedback equalizer according to the signal attenuation data and the total length of the line, so as to enable the target feedback equalizer to iteratively train the tap coefficient from the initial coefficient value until the tap coefficient tends to be stable. In this way, compared to the method of starting tap coefficient training from 0 or a preset fixed value, the present invention can adaptively set the initial coefficient value of each level of the equalizer according to the line signal attenuation amplitude, and can effectively accelerate the training speed of the tap coefficient in the equalizer, so that the system can reach a stable state faster, thereby accelerating the signal recovery efficiency. The tap coefficient tends to be stable when it converges.

[0028] In some embodiments, configuring the initial coefficient value for tap coefficient training of each target feedback equalizer according to the signal attenuation data and the total length of the line includes: estimating the transmission amplitude of the target signal when it is input into each target feedback equalizer according to the signal attenuation data and the total length of the line; setting the initial coefficient value for tap coefficient training of each target feedback equalizer to the opposite of the transmission amplitude. In this way, the tap coefficient of the equalizer refers to the weight value corresponding to each tap inside the equalizer, and each tap has a corresponding tap coefficient, which determines the gain or attenuation of the equalizer to signals with different frequency components. Since the tap coefficient of each level of feedback equalizer will eventually converge and stabilize near the value that can eliminate its tail amplitude, the transmission amplitude corresponding to the signal in the feedback equalizer of this level is estimated by the attenuation amplitude and the total length of the line, thereby setting the initial training value of the number of taps, which can speed up the time of adaptive training of the equalizer and effectively avoid signal recovery abnormalities caused by system divergence.

[0029] In some embodiments, enabling the target feedback equalizer corresponding to the working level to perform signal compensation on the target signal includes: enabling the target feedback equalizer whose level is less than or equal to the working level to perform signal compensation on the target signal with the tap coefficient that tends to be stable. In this way, only enabling the necessary feedback equalizer to perform signal compensation can reduce errors and power consumption. At the same time, by performing signal compensation with the tap coefficient that tends to be stable, the inter-symbol interference caused by signal transmission can be effectively reduced, thereby improving the transmission quality of the signal.

[0030] Figure 3 Schematic diagram showing the amplitude of a pulse signal after attenuation. Figure 3In one application scenario, if the initial amplitude of the pulse signal when it is input into the network cable is 1V, the position amplitude of the pulse signal in the middle period is 1V, the position amplitude of the pulse signal in the first period of the backward tail is 0.62V, and the position amplitude of the pulse signal in the second period of the backward tail is 0.28V. If the equalizer system wants to eliminate the backward tail of the pulse signal, it is necessary to eliminate the position amplitude in the first and second periods of the backward tail. Therefore, the tap coefficient of the feedback equalizer with the first period should be -0.62, and the tap coefficient of the feedback equalizer with the second period should be -0.28. The tap coefficient is obtained by adaptive training of each level of the equalizer, while in the traditional method, the initial coefficient value of the equalizer when training the tap coefficient is 0 by default, resulting in a slow adaptive speed, that is, the tap coefficient of the equalizer needs to be adaptively trained from 0 until the tap coefficient reaches -0.62 or -0.28 to complete the adaptive process. In the present invention, by extracting the signal attenuation data and estimating the amplitude of the signal attenuation in each cycle, the initial coefficient value is set to the corresponding amplitude, so that the tap coefficient can reach a converged and stable state faster. Specifically, according to the attenuation amplitude of the pulse signal under the current network cable length, it can be estimated that the amplitude of the pulse signal in the first cycle of the backward tail is 0.6, and the amplitude of the second cycle of the backward tail is 0.3. Then the initial coefficient value of the feedback equalizer whose level is in the first cycle is set to -0.6, and the initial coefficient value of the feedback equalizer whose level is in the second cycle is set to -0.3. In this way, the initial coefficient value of the feedback equalizer is very close to the final stable tap coefficient value, and can quickly complete the adaptation without having to adapt from 0 as in the existing solution.

[0031] According to another aspect of the present invention, Figure 4 2 is a schematic diagram showing a structure of a device 200 for restoring a line signal according to an embodiment of the present disclosure. Figure 4 , the device 200 includes an equalizer controller 202 and a multi-stage feedback equalizer.

[0032] Figure 5 Schematic diagram showing an execution method of a balancing controller according to an embodiment of the present disclosure. Figure 5 The equalization controller 202 is configured to implement the various steps of the method for restoring a line signal as described above. The multi-stage feedback equalizer is electrically coupled to the equalization controller 204 and configured to perform signal compensation on the target signal according to an enable signal.

[0033] Each level of feedback equalizer includes a forward feedback equalizer 204 and a decision feedback equalizer 206. The equalization controller 202 is connected to the forward feedback equalizer 204 and the decision feedback equalizer 206 respectively, the forward feedback equalizer 204 is used to eliminate the forward tail of the target signal, and the decision feedback equalizer 206 is used to eliminate the backward tail of the target signal. The equalization controller 202 is configured to predict the forward tail and backward tail distribution state of the data according to the signal attenuation data. The equalization controller 202 is configured to configure the working level of the forward feedback equalizer and the decision feedback equalizer according to the distribution state. In addition, the equalization controller 202 is configured to determine the initial training values ​​of the tap coefficients of each level of the forward feedback equalizer and the decision feedback equalizer according to the distribution state.

[0034] Each level of feedback equalizer also includes a decision maker 208. The outputs of the forward feedback equalizer 204 and the decision feedback equalizer 206 are connected to the input of the decision maker 208, and the output of the decision maker 208 is connected to the input of the decision feedback equalizer 206 to form a feedback loop. The decision maker 208 is responsible for quantizing and judging the received signal to restore the original digital data; quantizing the input signal is equivalent to a 1-bit ADC (analog-to-digital converter). The quantized logic can be regarded as the restored data. For example, if the digital signal is 0.7, there are only three states of -1 / 0 / 1 after the digital system restores the signal, so the decision maker will judge 0.7 as 1.

[0035] Figure 6 is a schematic diagram showing the structure of a multi-stage feedback equalizer according to an embodiment of the present disclosure. Figure 6 , FFE is a forward feedback equalizer, DFE is a decision feedback equalizer, enable1~N represents the enable signal of each level of feedback equalizer, F1~N represents the initial coefficient value of each level of forward feedback equalizer, and D1~N represents the initial coefficient value of each level of decision feedback equalizer.

[0036] In some embodiments, the apparatus 200 further includes a continuous time linear equalizer 210. The continuous time linear equalizer 210 is configured to receive the target signal transmitted via the line, and perform channel distortion compensation on the target signal to obtain the compensated target signal.

[0037] In some embodiments, the device 200 also includes an equalizer configurator 212 and an analog-to-digital converter 214. The equalizer configurator 212 is connected to the continuous-time linear equalizer 210, the output of the continuous-time linear equalizer 210 is connected to the input of the analog-to-digital converter 214, and the output of the analog-to-digital converter 214 is respectively connected to the equalizer controller 202 and the forward feedback equalizer 204. The equalizer configurator 212 is used to configure the working parameters of the continuous-time linear equalizer, and the working parameters only need to be manually configured once through the equalizer configurator 212, so that the working parameters of the continuous-time linear equalizer remain consistent during operation and do not participate in the self-adaptation and coefficient self-update of the feedback equalizer. The analog-to-digital converter 214 is used to convert the analog signal transmitted on the network cable into a digital signal that can be recognized and processed by the digital system, so that the subsequent equalizer can process these signals.

[0038] In summary, the present invention provides a method and device for recovering line signals. In order to ensure that the equalizer system can handle the signal attenuation problem of long network cables, the number of feedback equalizers turned on by the equalizer system needs to be more than that of short network cables to eliminate signal tailing. However, due to the pipeline working mode of the feedback equalizer, the error of each level of feedback equalizer will be affected by the equalization results output by the first N levels of feedback equalizers. Therefore, under different line conditions, different levels of feedback equalizers are adaptively selected to work to avoid ineffective operation of the equalizer. When transmitting signals through long lines, all equalizers are enabled to work to completely eliminate tailing; when transmitting signals through short lines, only necessary equalizers are enabled to work to avoid error accumulation and mutual influence, thereby reducing signal recovery errors.

[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for restoring a line signal, characterized in that: include: determining signal attenuation data of the line based on a target signal received from the line; as well as The working level of the feedback equalizer is configured according to the signal attenuation data, so that the target feedback equalizer corresponding to the working level can perform signal compensation on the target signal.

2. The method according to claim 1, characterized in that Determining signal attenuation data of a line based on a target signal received from the line includes: The final amplitude of the target signal after being transmitted through the line is obtained, and the signal attenuation data of the line is obtained by calculating the final amplitude of multiple cycles.

3. The method according to claim 2, characterized in that Configuring the working level of the feedback equalizer according to the signal attenuation data includes: Determine the total length of the line based on the line simulation test result according to the signal attenuation data; The working level of the feedback equalizer is configured according to the total length of the line.

4. The method according to claim 3, characterized in that The working stages of the feedback equalizer configured according to the total length of the line include: Obtaining a basic line length for signal compensation of each level of the feedback equalizer, and determining a multiple value between the total line length and the basic line length, wherein the multiple value is an integer; The working level of the feedback equalizer is configured to be the multiple value.

5. The method according to claim 2, characterized in that: Configuring the working level of the feedback equalizer according to the signal attenuation data includes: The working levels of the forward feedback equalizer and the decision feedback equalizer are configured according to the signal attenuation data.

6. The method according to claim 3, characterized in that After configuring the working level of the feedback equalizer according to the signal attenuation data, the method further includes: The initial coefficient value for tap coefficient training of each stage of the target feedback equalizer is configured according to the signal attenuation data and the total line length, so as to enable the target feedback equalizer to iteratively train the tap coefficient starting from the initial coefficient value until the tap coefficient tends to be stable.

7. The method according to claim 6, characterized in that Configuring the initial coefficient value of each stage of the target feedback equalizer for tap coefficient training according to the signal attenuation data and the total line length includes: estimating the transmission amplitude of the target signal when it is input into each stage of the target feedback equalizer according to the signal attenuation data and the total length of the line; The initial coefficient value used for tap coefficient training of each stage of the target feedback equalizer is set to the opposite number of the transmission amplitude.

8. The method according to claim 6, characterized in that Enabling a target feedback equalizer corresponding to the working level to perform signal compensation on the target signal includes: A target feedback equalizer with a level less than or equal to the working level is enabled to perform signal compensation on the target signal with the tap coefficient tending to be stable.

9. The method according to claim 2, characterized in that: Acquiring the final amplitude of the target signal after being transmitted through the line includes: A preconfigured continuous-time linear equalizer is used to perform channel distortion compensation on the target signal to obtain a compensated signal amplitude as the final amplitude.

10. A device for restoring line signals, characterized in that: include: an equalizer controller configured to determine signal attenuation data of the line according to a target signal received from the line, and configure a working level of the feedback equalizer according to the signal attenuation data, so that a target feedback equalizer corresponding to the working level can perform signal compensation on the target signal; as well as The multi-stage feedback equalizer is electrically coupled to the equalization controller and is configured to perform signal compensation on the target signal according to an enable signal.

11. The device according to claim 10, characterized in that Also includes: a continuous time linear equalizer configured to receive the target signal transmitted via the line and perform channel distortion compensation on the target signal to obtain the compensated target signal, The equalization controller is configured to determine signal attenuation data of the line according to the compensated target signal.

12. The device according to claim 10, characterized in that Each level of feedback equalizer includes a forward feedback equalizer and a decision feedback equalizer, wherein the equalization controller is configured as follows: Predicting data forward tailing and backward tailing distribution states according to the signal attenuation data; configuring the working levels of the forward feedback equalizer and the decision feedback equalizer according to the distribution state; as well as The initial training values ​​of the tap coefficients of each level of the forward feedback equalizer and the decision feedback equalizer are determined according to the distribution state.

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