CN111245765A - Wired carrier communication signal adaptive gain tracking and capturing method and device - Google Patents
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Abstract
The invention discloses a method and a device for tracking and capturing a wired carrier communication signal adaptive gain, aiming at the condition that the signal in an OFDM receiving system has higher speed and different powers, the searching capability of a synchronous frame header is improved and the gain adjusting functions of an AAGC and a DAGC are locked through the cooperation of the AAGC and the DAGC and the action of a power detection module and an automatic gain adjusting algorithm module, so that the system stability is enhanced; the automatic gain control function is started after the arrival of the leader sequence is determined in a synchronous detection mode, the frame header searching performance is improved, and the frame leakage rate under a low signal-to-noise ratio is reduced; under the action of the gain automatic adjustment algorithm, the fast power adjustment can be realized through the analog AGC, the transmission of a received signal in the maximum dynamic range is ensured, and the coarse acquisition process of an input signal is completed; the receiving range of the system is enlarged, the tracking and locking in a stable state can be quickly realized according to the common adjustment of the analog AGC and the digital AGC, and the sensitivity of the receiving system is improved.
Description
Technical Field
The invention relates to a gain tracking and capturing method and a device, in particular to a wired carrier communication signal self-adaptive gain tracking and capturing method and a device.
Background
The OFDM multi-carrier technology has a wide bandwidth, and in wired carrier communication, attenuation of different carrier frequencies differs, and due to the influence of factors such as transmission distance and transmission power, output power of a receiving end differs greatly. In order to solve this problem, automatic gain control is required to adjust the gain of the receiver, and the amplitude of the input signal of an Analog to digital Converter (ADC) is adjusted to an optimal threshold suitable for demodulation, so that the dynamic range of the ADC is better utilized to reduce the quantization distortion after sampling, and improve the sensitivity of the receiver.
The most important thing is to determine the magnitude of the gain value when performing automatic gain control, and in a wired carrier communication system, the existence of a burst communication mode causes that frames are not necessarily continuously transmitted, and empty symbols exist in the middle sometimes. If the gain value is determined by continuous power detection, it may cause misjudgment of the power level, for example, when no signal exists, the signal is considered to be attenuated incorrectly, so that the automatic gain control function is enabled after the preamble sequence is determined to arrive by means of synchronous detection. For a system with higher transmission rate requirement, the time for searching the frame head is shorter, and if the system still determines the gain value during the frame searching, the frame missing rate of the searching is increased to a great extent; therefore, the existing gain tracking and capturing method and device have the problem that the frame leakage rate is large, so that the gain tracking and capturing are inaccurate.
Disclosure of Invention
The invention aims to provide a method and a device for tracking and capturing a wired carrier communication signal by adaptive gain, which are used for solving the problem of inaccurate gain tracking and capturing caused by high frame leakage rate of the conventional method and device for tracking and capturing the gain.
In order to realize the task, the invention adopts the following technical scheme:
a method for tracking and capturing the adaptive gain of a wired carrier communication signal is used for obtaining the adaptive gain value of the wired carrier communication signal and is implemented according to the following steps:
step 1, obtaining a wired carrier communication signal, wherein the wired carrier communication signal is an analog signal;
step 2, performing gain compensation processing on the wired carrier communication signal by using a first gain value to obtain a gain-compensated analog signal;
wherein the initial value of the first gain value is 0 dB;
step 3, filtering the analog signal after the gain compensation to obtain a filtered analog signal;
step 4, sampling digital signals of the filtered analog signals to obtain digital signals;
step 5, performing gain compensation processing on the digital signal by using a second gain value to obtain a gain-compensated digital signal;
wherein the initial value of the second gain value is 0 dB;
step 6, obtaining a signal power value P of the gain compensated digital signal, wherein the unit is dBm;
judging whether the signal power value is within a power threshold range, and if so, executing the step 7; wherein the power threshold range is from the lowest threshold power value to the highest threshold power value which is normally adjusted by the receiver;
otherwise, returning to the step 2 after adjusting the first gain value;
step 7, calculating gain adjustment value delta as P-Ps，PsThe unit is a signal adjustment threshold value which is dBm, and the unit of a gain adjustment value delta is dB;
and 8, obtaining the self-adaptive gain value, wherein the self-adaptive gain value comprises a new first gain value and a new second gain value, the new first gain value is α multiplied by delta, the unit is dB, the new second gain value is β multiplied by delta, the unit is dB, α and β are constant parameters which are both more than 0 and less than 1, and α + β is 1.
Further, when the first gain value is adjusted in step 6, Q is set to Q + Q, where Q denotes the first gain value and has a unit of dB; q represents the increment of the first gain value in dB, and q is a constant.
Further, when the first gain value is adjusted in step 6, setting is performed
Where Q represents a first gain value in dB.
Further, α: β is 3: 7.
A wired carrier communication signal adaptive gain tracking and capturing device comprises a signal input module, an analog AGC module, a filter module, an ADC (analog-to-digital converter) sampling module, a digital AGC module, a power detection module, a gain adjustment value calculation module and an adaptive gain value acquisition module;
the signal input module is used for acquiring a wired carrier communication signal, and the wired carrier communication signal is an analog signal;
the analog AGC module is used for carrying out gain compensation processing on the wired carrier communication signal by using a first gain value to obtain an analog signal after gain compensation;
wherein the initial value of the first gain value is 0 dB;
the filter module is used for filtering the analog signal after the gain compensation to obtain a filtered analog signal;
the ADC sampling module is used for carrying out digital signal sampling on the filtered analog signal to obtain a digital signal;
the digital AGC module is used for carrying out gain compensation processing on the digital signal by using a second gain value to obtain a gain-compensated digital signal; wherein the initial value of the second gain value is 0 dB;
the power detection module is used for obtaining a signal power value P of the gain-compensated digital signal, and the unit is dBm;
the power detection module is also used for judging whether the signal power value is within a power threshold range, and if so, inputting a gain adjustment value calculation module; wherein the power threshold range is from the lowest threshold power value to the highest threshold power value which is normally adjusted by the receiver;
otherwise, the first gain value is adjusted and then the analog AGC module is returned;
the gain adjustment value calculation module is used for calculating a gain adjustment value delta P-Ps，PsThe unit is a signal adjustment threshold value which is dBm, and the unit of a gain adjustment value delta is dB;
the adaptive gain value obtaining module is used for obtaining the adaptive gain value, the adaptive gain value comprises a new first gain value and a new second gain value, the new first gain value is α multiplied by delta, the unit is dB, the new second gain value is β multiplied by delta, the unit is dB, α and β are constant parameters which are both larger than 0 and smaller than 1, and α + β is 1.
Further, when the first gain value is adjusted in the power detection module, Q is set to Q + Q, where Q denotes the first gain value and has a unit of dB; q represents the increment of the first gain value in dB, and q is a constant.
Further, when the first gain value is adjusted in the power detection module, setting is performed
Where Q represents a first gain value in dB.
Further, α: β is 3: 7.
Compared with the prior art, the invention has the following technical effects:
1. the method and the device for capturing the wired carrier communication signal adaptive gain tracking provided by the invention have the advantages that the automatic gain control function is started after the arrival of the leader sequence is determined in a synchronous detection mode, the frame header searching performance is improved, and the frame leakage rate under the low signal-to-noise ratio is reduced;
2. the method and the device for tracking and capturing the adaptive gain of the wired carrier communication signal provided by the invention have the advantages that the automatic gain adjusting method is provided, the rapid power adjustment can be realized through the analog AGC, the transmission of the received signal in the maximum dynamic range is ensured, and the coarse capturing process of the input signal is completed;
3. the wired carrier communication signal self-adaptive gain tracking capture method and the device provided by the invention have the advantages that the system receiving range is enlarged, the tracking locking in a stable state can be quickly realized according to the common adjustment of the analog AGC and the digital AGC, and the sensitivity of a receiving system is improved;
4. the method and the device for tracking and capturing the adaptive gain of the wired carrier communication signal adjust the first gain value of the analog AGC by using a fixed step search method, so that the adjustment interval of the analog AGC, which meets the demodulation threshold range, can be determined; the first gain value of the analog AGC is adjusted by utilizing the bisection method, the calculation is simple, the method is reliable, the search range can be reduced by half through comparison every time, and the rapid adjustment of the analog AGC is realized.
Drawings
Fig. 1 is a schematic structural diagram of a wired carrier communication signal adaptive gain tracking and capturing apparatus provided in the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples. So that those skilled in the art can better understand the present invention. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
The following definitions or conceptual connotations relating to the present invention are provided for illustration:
gain tracking acquisition: the process of searching the gain value in a large range and finally determining the specific gain value.
Analog Automatic Gain Control (AAGC): and the feedback control circuit converts the average value of the output voltage into a proper direct current level through the detection circuit and feeds the proper direct current level back to the gain control end of the voltage-controlled gain amplifier.
Digital Automatic Gain Control (DAGC): a feedback control circuit in which the main function of the feedback section is implemented digitally.
Gain value: a multiple of signal amplification; the unit is dB.
ADC sampling: it is a process of converting an analog quantity continuously changing with time into a time-discrete analog quantity in an analog-to-digital converter.
A receiver: in many electromagnetic waves, the required frequency components are selected, the unwanted signals are suppressed or filtered, and then the original useful information is obtained through amplification and demodulation.
Example one
In this embodiment, a method for tracking and capturing adaptive gain of a wired carrier communication signal is disclosed, which is used to obtain an adaptive gain value of an analog signal.
Aiming at the signals in the OFDM receiving system with higher speed and different powers, the wired carrier communication signal adaptive gain tracking and capturing method improves the searching capability of a synchronous frame header and locks the gain adjusting functions of the AAGC and the DAGC by the cooperation of the analog AGC and the digital AGC and the functions of the power detection module and the gain automatic adjusting algorithm module so as to enhance the stability of the system.
The method is executed according to the following steps:
step 1, obtaining a wired carrier communication signal, wherein the wired carrier communication signal is an analog signal;
in this step, the input analog signal is the signal input end of the whole receiving system module in the physical layer, and is characterized by different power signal sizes and a large fluctuation range, where the signal fluctuation range is the range that needs to be adjusted by the subsequent system, and the final output signal is a signal with fixed power and meeting a certain signal-to-noise power ratio.
Step 2, performing gain compensation processing on the wired carrier communication signal by using a first gain value to obtain a gain-compensated analog signal;
wherein the initial value of the first gain value is 0 dB;
in this embodiment, step 2 is implemented by using an AAGC module, and an integrated physical device with a large dynamic range is selected, so as to ensure that the power of the intermediate frequency input signal with different power levels output by the AAGC can be stabilized at a relatively stable amplitude. The method mainly aims to improve the transmission quality of the whole signal, and adjusts the amplitude of the input signal of the ADC to the optimal threshold suitable for demodulation by amplifying or reducing the input signal reaching the ADC so as to reduce the quantization distortion after sampling by using the dynamic range of the ADC, improve the sensitivity of a receiving system, prevent the overflow of the output signal, avoid the occurrence of error codes and well achieve the aim of signal processing;
step 3, filtering the analog signal after the gain compensation to obtain a filtered analog signal;
in this embodiment, step 3 is implemented by using an anti-aliasing filter module, which is a low-pass filter built by LC through theoretical calculation, and mainly aims to reduce aliasing frequency components in the output signal level to an insignificant degree, thereby substantially or completely satisfying the sampling theorem of the post-stage ADC sampling module and avoiding signal distortion;
step 4, sampling digital signals of the filtered analog signals to obtain digital signals;
in this embodiment, step 4 is implemented by using an ADC sampling module, and this part selects an integrated chip meeting the requirements, and mainly aims to convert an analog signal into a digital signal, so that, for this design, it is convenient to process relevant physical quantities in an FPGA;
in the steps 1 to 4 of the present invention, which are steps of processing an analog signal to finally obtain a digital signal, AAGC is used to control the amplitude of a signal arriving at the input terminal of the ADC, and the AAGC has three working states: amplification, attenuation and 0dB (namely no amplification and no attenuation), the initial state is 0dB, and the ADC is ensured to find the optimal threshold suitable for demodulation by adjusting the control voltage range of the AAGC. The AGC output is connected with a filter, the input signal is filtered and converted into a band-limited signal, for example, the working frequency after filtering is limited to fh, so that a sampling frequency fs can be found, the nyquist sampling law is met, namely fs is more than or equal to 2fh, and the signal spectrum after ADC sampling is ensured not to be aliased. And the ADC sampling module converts the analog signal output by the filter into a digital signal after receiving the analog signal.
Step 5, performing gain compensation processing on the digital signal by using a second gain value to obtain a gain-compensated digital signal; wherein the initial value of the second gain value is 0 dB;
in this embodiment, step 5 is implemented by using a DAGC module, which mainly aims to ensure that the power detection module can perform a signal search function, and reserve the DAGC module to compensate the signal output by the ADC sampling in the digital domain;
step 6, obtaining the signal power value of the digital signal after the gain compensation, wherein the unit is dBm;
judging whether the signal power value is within a power threshold range, and if so, executing the step 7; wherein the power threshold range is from the lowest threshold power value to the highest threshold power value which can be normally adjusted by the receiver;
otherwise, returning to the step 2 after adjusting the first gain value;
in this step, DAGC may compensate discrete signal components output by ADC, which has three working states, amplification, attenuation or 0dB (i.e. no amplification or attenuation), where the initial state is 0dB, and then it performs data search through the frame synchronization header output by the power detection module, and further randomly intercepts a segment of signal to perform trigger power calculation of discrete components, and performs difference processing with the optimal demodulation threshold, where the obtained data is recorded as △, and △ performs processing through the automatic gain adjustment algorithm module, so as to implement the search and lock states, and finally ensure △ to be constant and not approach to 0, at this time, it can be considered that the ADC input signal amplitude has been locked to the optimal demodulation threshold, that is, the receiving performance of the whole device has reached stability.
And searching a standard signal of a synchronization head of the DAGC output signal, thereby randomly intercepting a certain section of signal to calculate power. The power calculation formula of the received signal with the length sequence of N is as follows:
p is the received signal power value with length sequence N, s (t) is the DAGC output signal (i.e. the short time burst signal arriving at the input of the power detection module), Re is the real part of the signal, Im is the imaginary part of the signal.
In this step, one purpose is to accomplish peak detection of the ADC sampled output signal. Carrying out coarse search on a synchronous head standard signal at the beginning of an effective signal, thereby randomly intercepting a certain section of signal to carry out trigger power calculation;
in this step, another purpose is to achieve gain search (tracking) and lock (acquisition).
Searching: the receiving system starts to receive data, the AAGC and the DAGC are both in a 0dB state under the initial condition, under the condition, the AAGC circularly searches in a linear voltage control range under the action of the gain automatic adjustment algorithm module according to the comparison of the detected trigger power value and the optimal demodulation threshold value until the power value detected by the power detection module is in the optimal demodulation threshold range, and when the state is reached, the searching process is finished.
In this embodiment, the automatic gain adjustment algorithm in the search process may adopt a linear gain stepping method or a bisection method to implement the gain adjustment of the AAGC.
Optionally, when the first gain value is adjusted in step 6, Q ═ Q + Q is set, where Q denotes the first gain value and has a unit of dB; q represents the increment of the first gain value in dB, and q is a constant.
In this embodiment, the specific implementation method of the linear gain stepping method is: within the linear gain adjustment range of the AAGC, cyclic stepping is performed with gain steps of, for example, 2dB until the received power meets the demodulation threshold range requirement of the receiving system.
Optionally, when the first gain value is adjusted in step 6, setting is performed
Where Q represents a first gain value in dB.
In this embodiment, the dichotomy is realized by reducing the voltage range of the AAGC by a factor of two, continuously searching for the gain compensation value corresponding to the middle value of the linear voltage range of the AAGC, if the value fails to meet the requirement of the demodulation threshold range of the receiving system, continuing to reduce the range and search for the middle value according to the algorithm, and repeating the process until a suitable gain compensation value is found.
Step 7, calculating gain adjustment value delta as P-PsP is the signal power value, PsThe unit is a signal adjustment threshold value which is dBm, and the unit of a gain adjustment value delta is dB;
in this embodiment, after the search state is completed, under the action of the gain automatic adjustment module, the power value obtained by power detection is subjected to difference processing with the demodulation threshold value required by the system, the obtained data is recorded as △, since △ is a dynamically changing value, △ is fed back to AAGC and DAGC respectively in a fixed proportion through an algorithm, it is ensured that △ is in a minimum interval, at this time, it can be considered that the amplitude of the ADC input signal is locked to the optimal demodulation threshold, that is, the receiving performance of the entire device is dynamically stable, when △ is a negative number, amplification is performed, and when △ is a positive number, attenuation is performed.
And 8, obtaining the self-adaptive gain value, wherein the self-adaptive gain value comprises a new first gain value and a new second gain value, the new first gain value is α multiplied by delta, the unit is dB, the new second gain value is β multiplied by delta, the unit is dB, α and β are constant parameters which are both more than 0 and less than 1, and α + β is 1.
Optionally, α: β ═ 3: 7.
In this embodiment, the algorithm idea involved in the locking process is to make the difference between the power value obtained by power detection and the demodulation threshold value required by the system be 3: and 7, distributing the ratio to the AAGC and the DAGC to perform compensation correction of the gain, wherein the process is a fine adjustment process for the AAGC, and the gain is only finely adjusted in a small range.
The advantage of using coarse search by AAGC and fine locking by AAGC and DAGC is that the entire receiving system can be guaranteed to quickly achieve steady state according to system requirements.
Example two
The embodiment discloses a wired carrier communication signal adaptive gain tracking and capturing device, which comprises a signal input module, an analog AGC module, a filter module, an ADC (analog to digital converter) sampling module, a digital AGC module, a power detection module, a gain adjustment value calculation module and an adaptive gain value acquisition module;
the signal input module is used for acquiring an analog signal;
the analog AGC module is used for carrying out gain compensation processing on the analog signal by utilizing a first gain value to obtain an analog signal after gain compensation;
wherein the initial value of the first gain value is 0 dB;
the filter module is used for filtering the analog signal after the gain compensation to obtain a filtered analog signal;
the ADC sampling module is used for carrying out digital signal sampling on the filtered analog signal to obtain a digital signal;
the digital AGC module is used for carrying out gain compensation processing on the digital signal by using a second gain value to obtain a gain-compensated digital signal; wherein the initial value of the second gain value is 0 dB;
the power detection module is used for obtaining a signal power value of the gain-compensated digital signal, and the unit is dBm;
the power detection module is also used for judging whether the signal power value is within a power threshold range, and if so, inputting a gain adjustment value calculation module; wherein the power threshold range is from the lowest threshold power value to the highest threshold power value which can be normally adjusted by the receiver;
otherwise, the first gain value is adjusted and then the analog AGC module is returned;
the gain adjustment value calculation module is used for calculating a gain adjustment value delta P-PsP is the signal power value, PsThe unit is a signal adjustment threshold value which is dBm, and the unit of a gain adjustment value delta is dB;
the adaptive gain value obtaining module is used for obtaining the adaptive gain value, the adaptive gain value comprises a new first gain value and a new second gain value, the new first gain value is α multiplied by delta, the unit is dB, the new second gain value is β multiplied by delta, the unit is dB, α and β are constant parameters which are both larger than 0 and smaller than 1, and α + β is 1.
Optionally, when the first gain value is adjusted in the power detection module, Q is set to Q + Q, where Q denotes the first gain value and has a unit of dB; q represents the increment of the first gain value in dB, and q is a constant.
Optionally, when the first gain value is adjusted in the power detection module, setting is performed
Where Q represents a first gain value in dB.
Optionally, α: β ═ 3: 7.
The process of performing adaptive gain tracking and capturing by using the apparatus for tracking and capturing the adaptive gain of the wired carrier communication signal provided in this embodiment is, as shown in fig. 1, that:
the method comprises the following steps: the analog signal A reaches an input port of an analog AGC module at a signal input module with small signal power;
step two: when a receiving system starts to work, a first gain value of an analog AGC module is initially defaulted to 0dB, the output power B (at the moment, the signal power B is approximately equal to A) of the analog AGC module in the state must be filtered by a filter module, an LC type anti-aliasing filter is selected for processing in order to meet the sampling theorem of an ADC (analog-to-digital converter) sampling module, and the output signal power is marked as C; then sampling and outputting the signal through an ADC module to obtain an output level D and a corresponding signal-to-noise ratio E;
step three: firstly, a signal D output by the ADC sampling module passes through the digital AGC module, a second gain value of the digital AGC module is initially defaulted to 0dB, and the output level is marked as F (at the moment, the signal power F is approximately equal to D); and then, calculating a receiving power value P in the power detection module, wherein the size of the power value can be used as a basis for starting the AAGC function.
When P is more than Pmax (the highest threshold that the receiver can demodulate) or P is less than Pmin (the lowest threshold that the receiver can demodulate), the corresponding analog AGC module rapidly enters the search adjustment process of gain attenuation or amplification state under the action of the power detection module; wherein Pmax and Pmin are respectively the highest threshold that the receiver can demodulate normally and the lowest threshold that the receiver can demodulate normally, and can be calculated according to the theory of the receiving system.
When Pmin is less than or equal to P and less than or equal to Pmax, for the search state, neither AAGC nor DAGC is needed to be adjusted.
The final judgment standard for the completion of the search state is that Pmin is less than or equal to P and less than or equal to Pmax.
Step four: if the searching state is judged to be realized, the receiving system can enter the locking process, otherwise, the step three is skipped to, and the gain adjustment of the searching process is continued.
Entering the locking process, the gain adjustment value calculation module starts to calculate the gain adjustment value delta, and the demodulation threshold required by the receiver system to reach is a fixed power value, which is marked as PSSince P received by the receiver system is a dynamically changing power value, let P-PS＝Δ。
△ are distributed according to a preset proportion according to an automatic gain adjustment algorithm, and finally the self-adaptive gain value is obtained.
The adaptive gain value obtained in this embodiment is finally fed back to the AAGC and the DAGC, so that the AAGC and the DAGC perform the increase or attenuation compensation within a small range within their linear gain intervals at the same time, and when the receiving system reaches a dynamic stable state, the obtained adaptive gain value is used to process the analog signal, and then the obtained output power P enters the subsequent signal mediation module.
Claims (8)
1. A method for acquiring the adaptive gain tracking of a wired carrier communication signal is used for obtaining the adaptive gain value of the wired carrier communication signal, and is characterized by comprising the following steps:
step 1, obtaining a wired carrier communication signal, wherein the wired carrier communication signal is an analog signal;
step 2, performing gain compensation processing on the wired carrier communication signal by using a first gain value to obtain a gain-compensated analog signal;
wherein the initial value of the first gain value is 0 dB;
step 3, filtering the analog signal after the gain compensation to obtain a filtered analog signal;
step 4, sampling digital signals of the filtered analog signals to obtain digital signals;
step 5, performing gain compensation processing on the digital signal by using a second gain value to obtain a gain-compensated digital signal;
wherein the initial value of the second gain value is 0 dB;
step 6, obtaining a signal power value P of the gain compensated digital signal, wherein the unit is dBm;
judging whether the signal power value is within a power threshold range, and if so, executing the step 7; wherein the power threshold range is from the lowest threshold power value to the highest threshold power value which is normally adjusted by the receiver;
otherwise, returning to the step 2 after adjusting the first gain value;
step 7, calculating gain adjustment value delta as P-Ps，PsThe unit is a signal adjustment threshold value which is dBm, and the unit of a gain adjustment value delta is dB;
and 8, obtaining the self-adaptive gain value, wherein the self-adaptive gain value comprises a new first gain value and a new second gain value, the new first gain value is α multiplied by delta, the unit is dB, the new second gain value is β multiplied by delta, the unit is dB, α and β are constant parameters which are both more than 0 and less than 1, and α + β is 1.
2. The method as claimed in claim 1, wherein when the first gain value is adjusted in step 6, Q ═ Q + Q is set, where Q denotes the first gain value and has a unit of dB; q represents the increment of the first gain value in dB, and q is a constant.
3. The method of claim 1, wherein said step 6 of adjusting said first gain value sets said gain value
Where Q represents a first gain value in dB.
4. The wired-carrier communication signal adaptive gain tracking acquisition method of claim 1, wherein α: β: 3: 7.
5. A wired carrier communication signal adaptive gain tracking and capturing device is characterized by comprising a signal input module, an analog AGC module, a filter module, an ADC (analog to digital converter) sampling module, a digital AGC module, a power detection module, a gain adjustment value calculation module and an adaptive gain value acquisition module;
the signal input module is used for acquiring a wired carrier communication signal, and the wired carrier communication signal is an analog signal;
the analog AGC module is used for carrying out gain compensation processing on the wired carrier communication signal by using a first gain value to obtain an analog signal after gain compensation;
wherein the initial value of the first gain value is 0 dB;
the filter module is used for filtering the analog signal after the gain compensation to obtain a filtered analog signal;
the ADC sampling module is used for carrying out digital signal sampling on the filtered analog signal to obtain a digital signal;
the digital AGC module is used for carrying out gain compensation processing on the digital signal by using a second gain value to obtain a gain-compensated digital signal; wherein the initial value of the second gain value is 0 dB;
the power detection module is used for obtaining a signal power value P of the gain-compensated digital signal, and the unit is dBm;
the power detection module is also used for judging whether the signal power value is within a power threshold range, and if so, inputting a gain adjustment value calculation module; wherein the power threshold range is from the lowest threshold power value to the highest threshold power value which is normally adjusted by the receiver;
otherwise, the first gain value is adjusted and then the analog AGC module is returned;
the gain adjustment value calculation module is used for calculating a gain adjustment value delta P-Ps，PsThe unit is a signal adjustment threshold value which is dBm, and the unit of a gain adjustment value delta is dB;
the adaptive gain value obtaining module is used for obtaining the adaptive gain value, the adaptive gain value comprises a new first gain value and a new second gain value, the new first gain value is α multiplied by delta, the unit is dB, the new second gain value is β multiplied by delta, the unit is dB, α and β are constant parameters which are both larger than 0 and smaller than 1, and α + β is 1.
6. The apparatus as claimed in claim 5, wherein when the first gain value is adjusted in the power detection module, Q is set to Q + Q, where Q represents the first gain value and has a unit of dB; q represents the increment of the first gain value in dB, and q is a constant.
7. The apparatus as claimed in claim 5, wherein said power detection module sets said first gain value when adjusting said power detection module
Where Q represents a first gain value in dB.
8. The wired-carrier communication signal adaptive gain tracking acquisition device of claim 5, wherein α: β: 3: 7.
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