Signal recovery method and device based on continuous time linear equalizer

Abstract

The invention discloses a signal recovery method and device based on a continuous time linear equalizer. The method includes: determining attenuation data based on an attenuated target signal received from a channel; configuring a compensation gain of a continuous time linear equalizer according to the attenuation data, and starting the continuous time linear equalizer to perform first signal compensation on the received target signal based on the compensation gain to generate a first compensation target signal; and sending the first compensation target signal to a feedback equalizer configured with a fixed working stage number so as to perform signal recovery on the target signal. According to the invention, the adaptive complexity of the equalizer system can be reduced, and the data recovery precision is ensured.

Description

Technical Field

[0001] The present invention relates to the field of signal transmission technology, and in particular to a signal recovery method and device based on a continuous time linear equalizer. 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. At present, 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. The working parameters of the FFE equalizer and the DFE equalizer need to be adaptively adjusted according to the signal attenuation each time they work. As the line range is larger, the number of working levels of the equalizer is more, and the working conditions of the equalizer are more complex, the self-adaptation of the equalizer working parameters is more difficult, the design of the equalizer system is more difficult, and the data recovery accuracy is lower. Summary of the invention

[0003] The present invention provides a signal recovery method and device based on a continuous-time linear equalizer, which can reduce the adaptive complexity of the equalizer system while ensuring data recovery accuracy.

[0004] In one aspect of the present invention, a signal recovery method based on a continuous time linear equalizer is provided. The method comprises: determining attenuation data based on an attenuated target signal received from a channel; configuring a compensation gain of a continuous time linear equalizer according to the attenuation data, and enabling the continuous time linear equalizer to perform a first signal compensation on the received target signal based on the compensation gain to generate a first compensated target signal; and sending the first compensated target signal to a feedback equalizer configured with a fixed working level to perform signal recovery on the target signal.

[0005] In another aspect of the present invention, a signal recovery device based on a continuous time linear equalizer is provided. The device includes: a feedback equalizer; a continuous time linear equalizer; and an equalization controller configured to determine attenuation data based on an attenuated target signal received from a channel; configure a compensation gain of the continuous time linear equalizer according to the attenuation data, and enable the continuous time linear equalizer to perform a first signal compensation on the received target signal based on the compensation gain to generate a first compensated target signal; and send the first compensated target signal to a feedback equalizer configured with a fixed working level to perform signal recovery on the target signal.

[0006] According to the technical solution of the present invention, the continuous-time linear equalizer dynamically configures its compensation gain according to the attenuation data of the target signal after signal attenuation to compensate for the attenuation and distortion of the target signal during transmission. At the same time, the compensated target signal is sent to the feedback equalizer for signal equalization processing to restore the signal. Since the working level of the feedback equalizer in the present invention is pre-fixed, there is no need to perform adaptive adjustment according to different channel conditions, thereby reducing the complexity of the adaptive algorithm of the equalizer system and effectively simplifying the management of the feedback equalizer. In addition, since the compensation gain of the continuous-time linear equalizer is adaptively adjusted according to the channel conditions, it can effectively optimize the pre-processing process of the target signal, so that the feedback equalizer can focus on its specific equalization task, which not only improves the signal processing efficiency, but also ensures the data recovery accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A flow chart of a signal recovery method based on a continuous time linear equalizer according to an embodiment of the present invention; Figure 2 Schematic diagram of the waveform of a pulse signal after signal compensation by a continuous time linear equalizer under different network cable lengths according to an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a signal recovery device based on a continuous-time linear equalizer according to an embodiment of the present invention; Figure 4 Schematic diagram of a balancing controller according to an embodiment of the present invention. DETAILED DESCRIPTION

[0008] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0009] In the prior art, the working parameters of the FFE equalizer and the DFE equalizer need to be adaptively adjusted according to the signal attenuation each time they work. As the line range is larger, the number of working levels of the equalizer is more, and the working conditions of the equalizer are more complex, the adaptiveness of the working parameters of the equalizer is more difficult, the design of the equalizer system is more difficult, and the data recovery accuracy is lower.

[0010] In order to solve at least the above-mentioned technical problems, the present disclosure provides a signal recovery method based on a continuous-time linear equalizer. According to the present disclosure, the continuous-time linear equalizer dynamically configures its compensation gain according to the attenuation data of the target signal after signal attenuation to compensate for the attenuation and distortion of the target signal during transmission. At the same time, the compensated target signal is sent to the feedback equalizer for signal equalization processing to restore the signal. In this way, according to the embodiment of the present disclosure, since the working level of the feedback equalizer is pre-fixed and set, there is no need to perform adaptive adjustment according to different channel conditions, thereby reducing the complexity of the adaptive algorithm of the equalizer system and effectively simplifying the management of the feedback equalizer. In addition, since the compensation gain of the continuous-time linear equalizer is adaptively adjusted according to the channel conditions, it can effectively optimize the pre-processing process of the target signal, so that the feedback equalizer can focus on its specific equalization task, which not only improves the signal processing efficiency, but also ensures the data recovery accuracy.

[0011] According to the disclosed embodiment, the working number of FFE and DFE equalizers is configured, and the compensation value of the continuous time linear equalizer (CTLE) is adaptively selected by extracting the attenuation of the signal. The CTLE can adaptively adjust its compensation gain according to the length of the network cable, which means that the system can automatically optimize to adapt to different channel characteristics without manual intervention or pre-configuration. Different network cable lengths will cause different signal attenuation and distortion. By automatically adjusting the gain of the CTLE, the system can compensate for these effects, thereby maintaining the quality of the signal at different network cable lengths. Fixed FFE and DFE levels can simplify the design because there is no need to implement complex adaptive algorithms for these equalizers. Fixed FFE and DFE configurations can provide more predictable performance and reduce potential stability issues caused by adaptive algorithms. This technical solution can adjust the gain compensation value of the CTLE according to different channel conditions and actual signal attenuation conditions, achieve more accurate signal compensation, and adapt to different channel conditions and environments.

[0012] According to the embodiment of the present disclosure, the system can automatically detect the transmission characteristics of the channel, such as attenuation, dispersion and multipath effects. These characteristics will change with the changes in channel length, materials and environmental conditions. The compensation degree of CTLE can be dynamically adjusted according to the detected channel characteristics. This adjustment is achieved by changing the filter parameters of CTLE to compensate for the attenuation and distortion of the signal during transmission. The compensated signal will be sent to FFE and DFE for further equalization processing. FFE is usually used to reduce the front-end interference, while DFE uses the previous decision results to reduce the rear-end interference. The compensation of CTLE ensures that FFE and DFE work under optimal conditions. Fixed working levels of FFE and DFE simplify the management of the equalizer. There is no need to adjust the complexity of FFE and DFE for different channel conditions, thereby reducing the complexity of system design and maintenance. The adaptive adjustment of CTLE can optimize the pre-processing of the signal, while FFE and DFE can focus on their specific equalization tasks. This division of labor can improve the efficiency of overall signal processing. The technical solution according to the embodiment of the present disclosure helps to improve the overall performance of the system, including data transmission rate and communication distance. This enables the system to be used in a wider range of application scenarios, including those with challenging channel conditions.

[0013] Hereinafter, the technical solution according to the present disclosure will be described with reference to specific embodiments and in conjunction with the accompanying drawings.

[0014] Figure 1 1 is a flow chart showing a signal recovery method 100 based on a continuous time linear equalizer according to an embodiment of the present disclosure. Figure 1 The method 100 includes the following steps 102 to 106.

[0015] At step 102, attenuation data is determined based on an attenuated target signal received from a channel.

[0016] In some embodiments, determining the attenuation data based on the attenuated target signal received from the channel includes: deactivating the continuous time linear equalizer, and controlling the route selector to receive the target signal through the first route, so that the target signal is input to the analog-to-digital converter to generate a converted target signal; and obtaining the attenuation data based on the converted target signal. In this way, in order to ensure the accuracy of the equalizer system estimating the line length, in the stage of estimating the line length, the first route is used to receive the signal, that is, the signal does not pass through the CTLE and is not amplified, so as to ensure that the working conditions of the equalizer system when judging the line length are consistent, and avoid different gain settings affecting the judgment of the line length.

[0017] In step 104, a compensation gain of a continuous time linear equalizer is configured according to the attenuation data, and the continuous time linear equalizer is enabled to perform a first signal compensation on the received target signal based on the compensation gain to generate a first compensated target signal.

[0018] In some embodiments, configuring the compensation gain of the continuous time linear equalizer according to the attenuation data includes: determining the line length of the signal transmission according to the attenuation data; and configuring the compensation gain of the continuous time linear equalizer according to the line length. In this way, due to the different attenuation conditions caused by different channel line lengths, the compensation gain that needs to be configured for the continuous time linear equalizer is also different. Therefore, the compensation gain is dynamically configured according to the line length to achieve the optimal signal recovery effect.

[0019] In some embodiments, determining the line length of the signal transmission according to the attenuation data includes: inputting the attenuation data into a preset signal attenuation model to estimate the line length. In this way, estimating the line length based on the preset signal attenuation model can effectively improve the dynamic configuration efficiency of the compensation gain.

[0020] In some embodiments, configuring the compensation gain of the continuous time linear equalizer according to the line length includes: obtaining a standard gain value corresponding to the line length from a preset gain database; configuring the compensation gain of the continuous time linear equalizer to the standard gain value; the standard gain value is the compensation gain of the continuous time linear equalizer to achieve optimized signal compensation under different line lengths. In this way, after determining the line length of the channel, the continuous time linear equalizer, i.e., the compensation gain of the CTLE, can be automatically configured according to the standard gain in the gain database to adapt to the current transmission conditions, thereby improving the applicability of the equalizer system to different transmission scenarios.

[0021] It should be noted that when the line length is short, that is, the line length is in the preset short line interval, it indicates that the signal attenuation is small, so the compensation gain configured by the continuous time linear equalizer is low to avoid excessive signal compensation and signal distortion. When the line length is medium, that is, the line length is in the preset medium line interval, it indicates that the signal attenuation is more significant, so the compensation gain configured by the continuous time linear equalizer will be higher than the compensation gain of the short line to ensure signal integrity and communication quality. When the line length is long, that is, the line length is in the preset long line interval, it indicates that the signal attenuation is serious, so the compensation gain configured by the continuous time linear equalizer is high, which can minimize signal distortion and improve signal readability.

[0022] In some embodiments, enabling the continuous time linear equalizer to perform first signal compensation on the received target signal based on the compensation gain includes: controlling the route selector to receive the target signal through a second route, so that the continuous time linear equalizer performs first signal compensation on the target signal based on the compensation gain. In this way, the route selector controls whether the target signal is processed by the continuous time linear equalizer.

[0023] In step 106, the first compensated target signal is sent to a feedback equalizer configured with a fixed working level to perform signal recovery on the target signal.

[0024] In some embodiments, sending the first compensated target signal to a feedback equalizer configured with a fixed working level to perform signal recovery on the target signal includes: inputting the first compensated target signal to an analog-to-digital converter to generate a converted first compensated target signal; and inputting the converted first compensated target signal to the feedback equalizer including a forward feedback equalizer and a decision feedback equalizer to perform signal recovery on the target signal. In this way, the target signal in the line is converted from an analog signal to a digital signal, so that the feedback equalizer performs digital equalization processing.

[0025] In some embodiments, after performing signal recovery, the method may further include: obtaining the tap coefficient of the feedback equalizer of the last stage in the fixed working stage, and adjusting the compensation gain according to the tap coefficient. In this way, the tap coefficient of the equalizer refers to the weight value corresponding to each tap inside the equalizer. Each tap has a corresponding tap coefficient, and these tap coefficients determine the gain or attenuation of the equalizer for signals with different frequency components. When the tap coefficient of the equalizer tends to converge, it indicates that the current signal processing effect is optimal. Since the compensation gain configured by the line length may not be able to directly achieve the optimal signal compensation, the compensation gain is further adjusted by the tap coefficient of the feedback equalizer to improve the signal recovery effect.

[0026] In some embodiments, the feedback equalizer includes a forward feedback equalizer and a decision feedback equalizer, wherein obtaining the tap coefficients of the feedback equalizer of the last stage in the fixed working level includes: obtaining the tap coefficients of the decision feedback equalizer of the last stage.

[0027] In some embodiments, adjusting the compensation gain according to the tap coefficient includes: if the tap coefficient is not within a preset range, adjusting the compensation gain according to a preset step gain, so that the continuous time linear equalizer performs a second signal compensation on the target signal based on the adjusted compensation gain to generate a second compensated target signal; and sending the second compensated target signal to the feedback equalizer for signal recovery until the tap coefficient is within the preset range. In this way, when the tap coefficient is outside the preset range, it indicates that the compensation gain of the CTLE is insufficient, resulting in the current feedback equalizer being unable to completely eliminate the tail of the target signal to achieve signal recovery. Therefore, the compensation gain is fine-tuned successively by a specific step gain, thereby improving the signal compensation effect of the CTLE and optimizing the signal recovery effect.

[0028] In some embodiments, the preset range is a numerical interval symmetrical about 0. According to the signal attenuation, the earlier the working level of the feedback equalizer is, the greater the signal compensation that the feedback equalizer needs to provide, that is, the larger its tap coefficient is, and the later the working level of the feedback equalizer is, the signal amplitude is close to 0, and the smaller the signal compensation that the feedback equalizer needs to provide is, that is, the closer its tap coefficient is to 0. Therefore, ideally, the tap coefficient of the last level of feedback equalizer should be close to 0 to indicate that all tails of the signal can be eliminated.

[0029] In a specific application scenario, the preset range is [-x, x], and x<0.5. The larger the x value in the preset range, the lower the adjustment sensitivity of the equalizer system to the continuous-time linear equalizer. In this case, when the tap coefficient of the feedback equalizer is not within the preset range, it indicates that the compensation gain currently configured for the continuous-time linear equalizer is insufficient, and the compensation gain needs to be fine-tuned according to the step gain to increase the compensation gain. When the tap coefficient of the feedback equalizer is within the preset range, it indicates that the compensation gain currently configured for the continuous-time linear equalizer is reasonable and does not need to be adjusted. Specifically, the step gain can be set to 1db. If the first-stage compensation gain currently configured for the continuous-time linear equalizer is 10db, and the tap coefficient of the feedback equalizer is not within the preset range, the step gain of 1db can be increased to the first-stage compensation gain of 10db, resulting in a second-stage compensation gain of 11db. At this time, after the continuous time linear equalizer and the feedback equalizer perform signal recovery based on the second stage compensation gain 11db, the tap coefficient is detected again. If the tap coefficient is still not within the preset range, a step gain of 1db is added to the second stage compensation gain 11db until the tap coefficient is detected to be within the preset range. In this way, each time the continuous time linear equalizer is adjusted, a step gain is added to the current compensation gain for fine tuning.

[0030] In some embodiments, the method may include: if it is detected that the channel condition or the line length has changed, configuring the compensation gain of the continuous time linear equalizer according to the attenuation data again. In this way, if the line length or channel condition changes, the equalizer system will re-evaluate the line condition and adjust the compensation gain of the CTLE accordingly to flexibly adapt to different signal transmission scenarios.

[0031] Figure 2 It is a schematic diagram showing the waveform of the pulse signal after the continuous time linear equalizer performs signal compensation under different network cable lengths. Figure 2 , Figure 2 (a) is the waveform of the pulse signal under the short network cable after the continuous time linear equalizer performs signal compensation. The compensation gain of the continuous time linear equalizer corresponds to the length of the short network cable. Figure 2 (b) is the waveform of the pulse signal under the medium-length network cable after the continuous-time linear equalizer performs signal compensation. The compensation gain of the continuous-time linear equalizer corresponds to the length of the medium-length network cable. Figure 2 (c) in the figure is the waveform of the pulse signal under the long network line after the signal is compensated by the continuous time linear equalizer, and the compensation gain of the continuous time linear equalizer corresponds to the length of the long network line. The CTLE in the figure is the continuous time linear equalizer. It can be seen that the attenuation waveform of the pulse signal under three different network cable lengths can be converted into the attenuation waveform of the pulse signal under the same fixed network cable length after the signal is compensated by the continuous time linear equalizer with different compensation gains. The present invention adaptively configures the compensation gain of the continuous time linear equalizer according to the network cable length of the pulse signal transmission, so that the pulse signals under different network cable lengths can be compensated to a pulse signal of a fixed network cable length. At the same time, the fixed working level of the feedback equalizer is manually configured to the working level corresponding to the fixed network cable length, so that the restored signal obtained after the pulse signal is processed by the continuous time linear equalizer and the feedback equalizer has a higher accuracy. In this way, even at different network cable lengths, signal recovery can be achieved by the feedback equalizer with the same working level, which effectively reduces the complexity of the feedback equalizer adaptive algorithm, and because the feedback equalizer is only configured with the necessary equalizer level, the initial state of the equalizer system is optimized.

[0032] According to another aspect of the present invention, Figure 3 2 is a schematic diagram showing the structure of a signal recovery device 200 based on a continuous time linear equalizer according to an embodiment of the present disclosure. Figure 3 The device 200 includes a feedback equalizer 202, a continuous-time linear equalizer 204, and an equalization controller 206.

[0033] In some embodiments, the apparatus 200 may further include a route selector 208. The route selector 208 is configured to select different routes to receive the target signal based on the control signal of the equalization controller 206.

[0034] In some embodiments, the device 200 may further include an equalization configurator 210, an analog-to-digital converter 212, and a decision device 214. Each level of feedback equalizer 202 includes a forward feedback equalizer 2022 and a decision feedback equalizer 2024. The output of the analog-to-digital converter 212 is connected to the equalization configurator 210 and the forward feedback equalizer 2022, respectively. The equalization configurator 210 is connected to the forward feedback equalizer 2022 and the decision feedback equalizer 2024, respectively, and the outputs of the forward feedback equalizer 2022 and the decision feedback equalizer 2024 are connected to the input of the decision device 214, and the output of the decision device 214 is connected to the input of the decision feedback equalizer 2024, forming a feedback loop. The equalization configurator 210 is configured to enable the corresponding number of forward feedback equalizers 2022 and decision feedback equalizers 2024 according to a preset fixed number of working levels. In addition, the first route of the route selector 208 is to directly receive the target signal via the analog-to-digital converter 212 , and the second route of the route selector 208 is to receive the target signal via the continuous-time linear equalizer 204 .

[0035] Figure 4 is a schematic diagram showing a balancing controller according to an embodiment of the present disclosure. Figure 4 The output of the analog-to-digital converter 212 is electrically coupled to the equalizer controller 206, and the output of the equalizer controller 206 is electrically coupled to the continuous-time linear equalizer 204. The equalizer controller 206 is configured to implement the corresponding steps or actions in the signal recovery method based on the continuous-time linear equalizer as described above, which will not be described in detail here.

[0036] In summary, the present invention provides a signal recovery method and device based on a continuous-time linear equalizer, which adaptively configures the compensation gain of the continuous-time linear equalizer according to the attenuation of the signal, thereby improving the integrity and communication quality of the signal and effectively reducing the bit error rate of the signal. At the same time, since the compensation gain of the continuous-time linear equalizer is dynamically configured, the feedback equalizer can also adapt to the attenuation signal processing of different line lengths under the condition of a fixed working level, which effectively broadens the application scenarios of the system and enhances the robustness of the system in different environments. In addition, the continuous-time linear equalizer performs precise compensation based on the signal attenuation, effectively reducing unnecessary performance loss in the equalizer system.

[0037] 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 signal recovery method based on a continuous time linear equalizer, characterized in that: include: determining attenuation data based on an attenuated target signal received from the channel; configuring a compensation gain of a continuous time linear equalizer according to the attenuation data, and enabling the continuous time linear equalizer to perform a first signal compensation on the received target signal based on the compensation gain to generate a first compensated target signal; as well as The first compensated target signal is sent to a feedback equalizer configured with a fixed working level to perform signal recovery on the target signal.

2. The method according to claim 1, characterized in that After signal restoration, it also includes: The tap coefficient of the feedback equalizer of the last stage in the fixed working stages is obtained, and the compensation gain is adjusted according to the tap coefficient.

3. The method according to claim 2, characterized in that The feedback equalizer includes a forward feedback equalizer and a decision feedback equalizer. Wherein obtaining the tap coefficients of the feedback equalizer of the last stage in the fixed working stages includes: obtaining the tap coefficients of the decision feedback equalizer of the last stage.

4. The method according to claim 2, characterized in that: Adjusting the compensation gain according to the tap coefficient comprises: If the tap coefficient is not within a preset range, adjusting the compensation gain according to a preset step gain, so that the continuous time linear equalizer performs a second signal compensation on the received target signal based on the adjusted compensation gain to generate a second compensated target signal; and The second compensated target signal is sent to the feedback equalizer to perform signal restoration on the target signal until the tap coefficient is within the preset range.

5. The method according to claim 1, characterized in that Determining attenuation data based on an attenuated target signal received from a channel includes: deactivating the continuous time linear equalizer, and controlling a route selector to receive the target signal through a first route so that the target signal is input to an analog-to-digital converter to generate a converted target signal; and The attenuation data is acquired based on the converted target signal.

6. The method according to claim 5, characterized in that Enabling the continuous time linear equalizer to perform first signal compensation on the received target signal based on the compensation gain includes: The route selector is controlled to receive the target signal through the second route, so that the continuous time linear equalizer performs a first signal compensation on the target signal based on the compensation gain.

7. The method according to claim 1, characterized in that Sending the first compensated target signal to a feedback equalizer configured with a fixed working level to perform signal recovery on the target signal comprises: inputting the first compensated target signal to an analog-to-digital converter to generate a converted first compensated target signal; and The converted first compensated target signal is input to the feedback equalizer including a forward feedback equalizer and a decision feedback equalizer to perform signal restoration on the target signal.

8. The method according to claim 1, characterized in that Configuring the compensation gain of the continuous-time linear equalizer according to the attenuation data includes: Determining the line length of signal transmission according to the attenuation data; and The compensation gain of the continuous time linear equalizer is configured according to the line length.

9. The method according to claim 8, characterized in that Determining the line length of signal transmission according to the attenuation data includes: The attenuation data is input into a preset signal attenuation model to estimate the line length.

10. The method according to claim 8, characterized in that Configuring the compensation gain of the continuous time linear equalizer according to the line length includes: Acquiring a standard gain value corresponding to the line length from a preset gain database; and configuring the compensation gain of the continuous-time linear equalizer to the standard gain value, The standard gain value is the compensation gain of the continuous time linear equalizer to achieve optimized signal compensation under different line lengths.

11. The method according to claim 8, characterized in that Also includes: If it is detected that the channel condition or the line length changes, the compensation gain of the continuous time linear equalizer is configured again according to the attenuation data.

12. A signal recovery device based on a continuous time linear equalizer, characterized in that: include: Feedback equalizer; Continuous-time linear equalizer; as well as The balancing controller is configured as: determining attenuation data based on an attenuated target signal received from the channel; configuring a compensation gain of the continuous time linear equalizer according to the attenuation data, and enabling the continuous time linear equalizer to perform a first signal compensation on the received target signal based on the compensation gain to generate a first compensated target signal; as well as The first compensated target signal is sent to the feedback equalizer configured with a fixed working level to perform signal restoration on the target signal.

13. The device according to claim 12, characterized in that Also includes: A route selector is configured to select different routes to receive the target signal based on a control signal of the equalizer controller.

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