Gain adjustment method and device, terminal station, communication system, medium and product

Abstract

The invention discloses a gain adjustment method and device, a terminal station, a communication system, a medium and a product, and relates to the technical field of wireless communication, and the disclosed gain adjustment method comprises the following steps: in a data transmission stage, obtaining a current signal strength value of a received current downlink data signal; comparing the current signal intensity value with a preset signal intensity range to obtain a first comparison result; when the first comparison result is that the current signal strength value is greater than or equal to the first signal strength threshold value, reducing the current signal gain value, and obtaining a target signal gain value when the downlink data signal is received; and when the first comparison result is that the current signal strength value is smaller than the second signal strength threshold value, increasing the current signal gain value to obtain a target signal gain value when the downlink data signal is received. According to the invention, the anti-interference capability of the gain adjustment method is improved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a gain adjustment method, device, terminal station, communication system, medium and product. Background Art

[0002] In the related art, the terminal station of the wireless communication system directly compares the signal strength of the received downlink data signal with the reference signal strength, obtains the error signal and performs gain adjustment. However, when there are signal outliers or external channel interference in the downlink data signal, the measured signal strength will have a large jump. Since the jump is not caused by the increase or decrease of the signal power itself, if the gain is adjusted directly according to the error signal, the signal strength of the subsequently received downlink data signal will be too large to exceed the energy limit threshold, or too small to zero. Therefore, the gain adjustment method needs to have a certain anti-interference ability against signal outliers and channel interference. Summary of the invention

[0003] The main purpose of this application is to provide a gain adjustment method, device, terminal station, communication system, medium and product, aiming to solve the technical problem of how to improve the anti-interference ability of the gain adjustment method.

[0004] To achieve the above object, the present application proposes a gain adjustment method, which includes:

[0005] In the data transmission phase, the current signal strength value of the received current downlink data signal is obtained;

[0006] Compare the current signal strength value with the first signal strength threshold and the second signal strength threshold to obtain a first comparison result, where the first signal strength threshold is greater than the second signal strength threshold;

[0007] When the first comparison result is that the current signal strength value is greater than or equal to the first signal strength threshold, reducing the current signal gain value to obtain a target signal gain value when receiving a downlink data signal;

[0008] When the first comparison result is that the current signal strength value is less than the second signal strength threshold, the current signal gain value is increased to obtain a target signal gain value when receiving a downlink data signal.

[0009] In one embodiment, before the step of comparing the current signal strength value with the first signal strength threshold and the second signal strength threshold to obtain a first comparison result, the gain adjustment method further includes:

[0010] A first signal strength threshold and a second signal strength threshold are determined based on the number of sampling bits when the current signal strength value is obtained.

[0011] In one embodiment, the first signal strength threshold is determined by the following formula:

[0012]

[0013] a is the first signal strength threshold, It is the preset sampling fixed point value, and the value range is 1 to 2 μ , μ is the number of sampling bits, τ is the preset redundancy value;

[0014] The second signal strength threshold is determined by the following formula:

[0015]

[0016] b is the second signal strength threshold.

[0017] In one embodiment, after the step of comparing the current signal strength value with the first signal strength threshold and the second signal strength threshold to obtain a first comparison result, the gain adjustment method further includes:

[0018] When the first comparison result is that the current signal strength value is less than the first signal strength threshold and greater than or equal to the second signal strength threshold, the current signal gain value is adjusted based on the first signal strength difference between the current signal strength value and the first reference signal strength value to obtain the target signal gain value.

[0019] In one embodiment, the step of adjusting the current signal gain value based on a first signal strength difference between the current signal strength value and the first reference signal strength value to obtain a target signal gain value includes:

[0020] Calculating a first signal strength difference between a current signal strength value and a first reference signal strength value;

[0021] When the first signal strength difference is less than zero, increasing the current signal gain value to obtain a target signal gain value;

[0022] When the first signal strength difference is greater than zero, the current signal gain value is reduced to obtain a target signal gain value.

[0023] In one embodiment, the step of reducing the current signal gain value to obtain the target signal gain value includes:

[0024] Based on the first preset gain step value, reducing the current signal gain value to obtain a target signal gain value;

[0025] or,

[0026] Based on a first gain adjustment value, reducing the current signal gain value to obtain a target signal gain value, the first gain adjustment value being the smaller of an absolute value of the first signal strength difference and a preset limit adjustment value;

[0027] The step of increasing the current signal gain value to obtain the target signal gain value includes:

[0028] Based on the second preset gain step value, increasing the current signal gain value to obtain a target signal gain value;

[0029] or,

[0030] Based on the second gain adjustment value, the current signal gain value is increased to obtain the target signal gain value, and the second gain adjustment value is the smaller one between the absolute value of the first signal strength difference and the preset limit adjustment value.

[0031] In one embodiment, the step of obtaining a current signal strength value of a currently received downlink data signal includes:

[0032] Obtaining an initial signal strength value of a currently received downlink data signal, where the currently received downlink data signal is a downlink data signal received at a current moment;

[0033] Based on at least one historical signal strength value, complementary filtering is performed on the current signal strength value to obtain the current signal strength value, where the historical signal strength value is a signal strength value of a historical downlink data signal received at a historical moment before the current moment.

[0034] In one embodiment, the step of obtaining a current signal strength value of a currently received downlink data signal includes:

[0035] According to a preset adjustment period, a current signal strength value of the currently received downlink data signal is periodically obtained.

[0036] In one embodiment, the step of obtaining a current signal strength value of a currently received downlink data signal includes:

[0037] Discretely sampling the received current downlink data signal to obtain multiple current sampling signals;

[0038] Performing a fast Fourier transform on each current sampling signal to obtain a corresponding plurality of current spectrum data;

[0039] Based on the current spectrum data, a current signal strength value of the current downlink data signal is determined.

[0040] In one implementation, the step of determining a current signal strength value of a current downlink data signal based on current spectrum data includes:

[0041] For each DC subcarrier in a plurality of current sampling signals, based on adjacent spectrum data of adjacent subcarriers of the DC subcarrier, determine DC spectrum data of each DC subcarrier;

[0042] The current signal strength value is determined based on the DC spectrum data and other spectrum data of other subcarriers except the DC subcarriers in the current spectrum data.

[0043] In one embodiment, in the data transmission stage, before the step of obtaining the current signal strength value of the currently received downlink data signal, the gain adjustment method further includes:

[0044] In the cell synchronization phase, the synchronization signal gain value is determined based on the target search signal gain value, and the target search signal gain value is the signal gain value when the frequency search is successful in the cell search phase;

[0045] Based on the synchronization signal gain value, the received downlink synchronization signal is demodulated to complete cell synchronization;

[0046] The synchronization signal gain value is used as the current signal gain value, and the data transmission phase is entered.

[0047] In one embodiment, the step of determining the synchronization signal gain value based on the target search signal gain value includes:

[0048] Adjusting the target search signal gain value based on a second signal strength difference between a synchronization signal strength value of the downlink synchronization signal and a second reference signal strength value to obtain an initial synchronization signal gain value;

[0049] Compare the initial synchronization signal gain value with the first gain threshold and the second gain threshold to obtain a second comparison result, where the first gain threshold is greater than the second gain threshold;

[0050] Based on the second comparison result, a synchronization signal gain value is determined.

[0051] In one embodiment, the step of determining the synchronization signal gain value based on the second comparison result includes:

[0052] When the second comparison result is that the initial synchronization signal gain value is less than or equal to the first gain threshold and greater than or equal to the second gain threshold, the initial synchronization signal gain value is used as the synchronization signal gain value;

[0053] When the second comparison result is that the initial synchronization signal gain value is greater than the first gain threshold, the first gain threshold is used as the synchronization signal gain value;

[0054] When the second comparison result is that the initial synchronization signal gain value is less than the second gain threshold, the second gain threshold is used as the synchronization signal gain value.

[0055] In one embodiment, in the cell synchronization stage, before the step of determining the synchronization signal gain value based on the target search signal gain value, the gain adjustment method further includes:

[0056] In the cell search phase, frequency point traversal search is performed based on the current search signal gain value;

[0057] In the case where the frequency point search fails, adjusting the current search signal gain value, and returning to the step of performing a frequency point traversal search based on the current search signal gain value;

[0058] If the frequency search is successful, the cell synchronization phase begins.

[0059] In one embodiment, before the step of performing a frequency point traversal search based on the current search signal gain value, the gain adjustment method further includes:

[0060] determining an initial signal gain value based on a preset percentage of a gain difference between a first gain threshold and a second gain threshold;

[0061] The initial signal gain value is used as the current search signal gain value.

[0062] In one implementation, when the frequency search fails, the step of adjusting the current search signal gain value includes:

[0063] In case the frequency search fails, comparing the current search signal gain value with the initial signal gain value, the first gain threshold and the second gain threshold;

[0064] When the current search signal gain value is greater than or equal to the initial signal gain value and less than the first gain threshold, increase the current search signal gain value;

[0065] When the current search signal gain value is greater than or equal to the first gain threshold, the initial signal gain value is used as the current search signal gain value, and the current search signal gain value is reduced;

[0066] When the current search signal gain value is less than the initial signal gain value and greater than the second gain threshold, the current search signal gain value is reduced.

[0067] In one embodiment, the step of increasing the current search signal gain value includes:

[0068] Based on the third preset gain step value, increasing the current search signal gain value;

[0069] The step of reducing the current search signal gain value comprises:

[0070] Based on the fourth preset gain step value, the current search signal gain value is reduced.

[0071] In addition, to achieve the above purpose, the present application also proposes a gain adjustment device, the gain adjustment device comprising:

[0072] An acquisition module is used to acquire the current signal strength value of the current downlink data signal received during the data transmission phase;

[0073] A comparison module, used to compare the current signal strength value with the first signal strength threshold and the second signal strength threshold to obtain a first comparison result, where the first signal strength threshold is greater than the second signal strength threshold;

[0074] A first adjustment module, configured to reduce the current signal gain value to obtain a target signal gain value when receiving a downlink data signal when the first comparison result is that the current signal strength value is greater than or equal to the first signal strength threshold;

[0075] The second adjustment module is used to increase the current signal gain value to obtain a target signal gain value when receiving a downlink data signal when the first comparison result is that the current signal strength value is less than a second signal strength threshold.

[0076] In addition, to achieve the above objectives, the present application also proposes a terminal station, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the gain adjustment method as described above.

[0077] In addition, to achieve the above purpose, the present application also proposes a communication system, the communication system comprising:

[0078] Such as the terminal station mentioned above.

[0079] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the gain adjustment method as described above are implemented.

[0080] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the gain adjustment method as described above are implemented.

[0081] One or more technical solutions proposed in this application have at least the following technical effects:

[0082] The present application provides a gain adjustment method, device, terminal station, communication system, medium and product. In the data transmission stage, a current signal strength value of a currently received downlink data signal is obtained; the current signal strength value is compared with a preset signal strength range to obtain a first comparison result; when the first comparison result is that the current signal strength value is greater than or equal to a first signal strength threshold, the current signal gain value is reduced to obtain a target signal gain value when receiving the downlink data signal; when the first comparison result is that the current signal strength value is less than a second signal strength threshold, the current signal gain value is increased to obtain a target signal gain value when receiving the downlink data signal.

[0083] Therefore, the present application provides a gain adjustment method. In the data transmission stage, when the current signal strength value is greater than the first signal strength threshold, the current signal gain value is reduced, and when the current signal strength value is less than the second signal strength threshold, the current signal gain value is increased. In the case where the current signal strength value changes significantly, the gain adjustment is performed based on the first comparison result between the current signal strength value and the first signal strength threshold and the second signal strength threshold, so that the signal strength value of the received downlink data signal is limited by the first signal strength threshold and the second signal strength threshold, thereby avoiding directly performing gain adjustment based on the error signal, so that the signal strength of the subsequently received downlink data signal is too large to exceed the energy limit threshold, or too small to be zero, thereby improving the anti-interference ability of the gain adjustment method. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0085] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0086] Figure 1 This is a flow chart of the first embodiment of the gain adjustment method of the present application;

[0087] Figure 2 This is a flow chart of an implementation method of the data transmission phase of the gain adjustment method of the present application;

[0088] Figure 3 This is a flow chart of another implementation method of the data transmission stage of the gain adjustment method of the present application;

[0089] Figure 4 is an exemplary DDS false detection rate simulation curve under different signal strengths;

[0090] Figure 5 is an exemplary DSS false detection rate simulation curve when the signal strength is 0dBFS;

[0091] Figure 6 A flowchart of an implementation method of a cell search phase of the gain adjustment method of the present application;

[0092] Figure 7 This is a schematic diagram of the change of the current search signal gain during the cell search phase of this application;

[0093] Figure 8 A flowchart of an implementation method of a cell search phase and a cell synchronization phase of a gain adjustment method of the present application;

[0094] Fig. 9 This is a schematic diagram of the module structure of the gain adjustment device according to an embodiment of the present application;

[0095] Fig.10 A schematic diagram of the terminal station structure of the hardware operating environment involved in the gain adjustment method in the embodiment of the present application.

[0096] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0097] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0098] In this application, the term "comprises", "includes" or any other variation thereof is intended to cover non-exclusive inclusion, so that a device or system including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a device or system. In the absence of more restrictions, an element defined by the sentence "includes..." does not exclude the presence of other identical elements in the device or system including the element.

[0099] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0100] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0101] The main solution of the embodiment of the present application is: in the data transmission stage, obtain the current signal strength value of the current downlink data signal received; compare the current signal strength value with the preset signal strength range to obtain a first comparison result; when the first comparison result is that the current signal strength value is greater than or equal to the first signal strength threshold, reduce the current signal gain value to obtain the target signal gain value when receiving the downlink data signal; when the first comparison result is that the current signal strength value is less than the second signal strength threshold, increase the current signal gain value to obtain the target signal gain value when receiving the downlink data signal.

[0102] With the continuous iteration and progress of wireless communication technology, today's society has entered the information age, and wireless communication technology plays an increasingly important role in all walks of life. In modern wireless communication systems, the input signal received by the air interface of the terminal station is affected by the distance between the base station and the terminal station block. There are signal attenuation, multipath effect, physical shielding between channels, and interference signals, which makes the signal strength of the input signal vary in a large range. In order to ensure that the signal strength of the input signal received by the terminal station meets the optimal demodulation performance requirements, the concept of AGC technology is introduced in the wireless communication system.

[0103] AGC (Auto Gain Control) technology belongs to the field of automatic control and is widely used in various practical projects, such as voice loudness adjustment, brightness adjustment in image acquisition, motor power gain control, etc. In wireless communication systems, AGC technology is often used in various terminal stations, so that the terminal station can dynamically adjust the signal gain according to the strength or amplitude of the input signal to obtain a stable signal to be demodulated, in preparation for subsequent demodulation. Since, for most wireless communication systems, the signal to be demodulated is required to have a high peak-to-average ratio, and the signal gain adjustment needs to be started before the reception event begins, the stability and adjustment speed of the AGC module in the terminal station have an important impact on the performance of the terminal station.

[0104] Early AGC modules consisted of simple analog circuits, and gain adjustment was done manually, which was inefficient. With the development of semiconductor technology and automatic control technology, stable gain adjustment can be achieved by introducing comparison modules and feedback links in the AGC module. And with the development of digital circuits, digital control methods are also often used in AGC modules, which not only improves the accuracy of AGC modules, but also introduces some flexible digital control strategies, greatly increasing the performance of AGC modules.

[0105] Among them, in the LTE (Long Term Evolution) system and NR (New Radio) system dominated by WIFi (wireless local area network) system and 3GPP (The Third Generation Partnership Project), the terminal station can use OFDM (Orthogonal Frequency Division Multiplexing) technology to estimate the signal strength according to the corresponding time domain signal on the frame structure designed by each, compare the signal strength estimation value with the reference signal strength value to obtain an error signal, and then adjust the gain according to the error signal to ensure that the power of the received time domain signal to be demodulated is within an appropriate range.

[0106] In summary, the terminal station can implement automatic gain adjustment based on the error signal. However, the baseband signal will be affected by the DC leakage of the RF hardware, resulting in a DC signal with a large energy mixed into the time domain signal received by the terminal station, thereby affecting the accuracy of the strength detection of the time domain signal received by the terminal station. Moreover, although the gain adjustment is fast according to the error signal, it does not take into account the stability of the strength detection and the influence of the complex channel environment. When the baseband signal has a signal anomaly or channel interference, the measured signal strength will inevitably detect a large jump. Since the jump is not caused by the increase or decrease of the signal power itself, if the gain adjustment is performed directly according to the error signal, the signal strength of the subsequently received downlink data signal will be too large to exceed the energy limit threshold, or too small to zero, resulting in poor demodulation performance of the terminal station. Therefore, the gain adjustment method needs to have a certain anti-interference ability against signal anomalies and channel interference.

[0107] In addition, during the cell search phase, the terminal station (TS) needs to blindly search each frequency point supported by the cell. During the blind frequency search, the terminal station needs to estimate the signal strength of the received time domain signal at each frequency point, which will greatly prolong the cell search time.

[0108] Therefore, the present application provides a solution. On the first aspect, in the data transmission stage, when the current signal strength value is greater than the first signal strength threshold, the current signal gain value is reduced, and when the current signal strength value is less than the second signal strength threshold, the current signal gain value is increased. In the case of a large jump in the current signal strength value, the gain is adjusted according to the first comparison result between the current signal strength value and the first signal strength threshold and the second signal strength threshold, so that the signal strength value of the received downlink data signal is limited by the first signal strength threshold and the second signal strength threshold, thereby avoiding directly adjusting the gain according to the error signal, so that the signal strength of the subsequently received downlink data signal is too large to exceed the energy limit threshold, or too small to be zero, thereby improving the anti-interference ability of the gain adjustment method.

[0109] Secondly, in the data transmission stage, if the current signal strength value is less than the first signal strength threshold and greater than or equal to the second signal strength threshold, the gain adjustment is performed according to the gain adjustment value determined in real time. If the current signal strength value is greater than or equal to the first signal strength threshold, or the current signal strength value is less than the second signal strength threshold, the gain adjustment is performed according to the preset gain step value. In the event that the current signal strength value changes significantly, the preset gain step value can be used for gain adjustment, so that the signal strength value of the received downlink data signal can be quickly limited to a reasonable energy range, thereby improving the efficiency of the gain adjustment method. When the current signal strength value is within the range between the first signal strength threshold and the second signal strength threshold, the gain adjustment is performed according to the gain adjustment value determined in real time, so that the target signal gain can be accurately adjusted to the optimal value, thereby improving the accuracy of the gain adjustment method.

[0110] Thirdly, during the data transmission stage, complementary filtering is performed on the initial signal strength value of the current downlink data signal based on the historical signal strength value, which can remove DC signal interference in the current downlink data signal and improve the accuracy of the current signal strength, thereby improving the accuracy of the gain adjustment method.

[0111] Fourthly, during the data transmission stage, gain adjustment is performed periodically according to a preset adjustment period, rather than for each frame of downlink data signal. This can avoid frequent changes in signal strength caused by frequent gain adjustments and severe jitter in the signal strength curve. It takes into account the impact of signal strength measurement stability and channel environment complexity on demodulation performance, meets the needs of actual channel environment changes, further improves the anti-interference ability of the gain adjustment method, and saves gain adjustment resources to a certain extent.

[0112] Fifthly, in the cell search stage, a frequency traversal search is performed in all frequency points of the cell where the terminal station is located under different current search signal gain values. During each frequency traversal search, there is no need to estimate the signal strength. It is only necessary to determine whether the downlink synchronization signal of each frequency point can be searched under the current search signal gain value to determine whether the frequency search is successful and complete the cell search, which saves the time of estimating the signal strength in the cell search stage and reduces the cell search time.

[0113] Sixthly, in the cell search phase, the current search signal gain value is limited between the first gain threshold and the second gain threshold. When the cell search is successful, the corresponding current search signal gain value can be directly set as the initial signal gain value of the cell synchronization phase. As a priori information, the downlink synchronization signal of the cell synchronization phase is adjusted to a reasonable energy value in the shortest time, thereby avoiding the occurrence of downlink synchronization signal error packets.

[0114] Seventhly, at different stages, the output signal gain value of each stage is used as a priori condition for the next stage, so that different stages can be efficiently connected, the gain adjustment time of different stages is reduced, and the occurrence of initial error packets in different stages is reduced.

[0115] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, a terminal station, etc. The following takes the terminal station as an example to illustrate this embodiment and the following embodiments.

[0116] Based on this, the embodiment of the present application provides a gain adjustment method, referring to Figures 1 to 3 , Figure 1 This is a flow chart of the first embodiment of the gain adjustment method of the present application. Figure 2 This is a flow chart of an implementation method of the gain adjustment method of the present application in the data transmission stage. Figure 3 This is a flow chart of another implementation of the gain adjustment method in the data transmission stage of the present application.

[0117] In this embodiment, Figure 1 As shown, the gain adjustment method may include steps S700 to S1000:

[0118] Step S700: in the data transmission phase, obtaining the current signal strength value of the currently received downlink data signal.

[0119] Step S800: Compare the current signal strength value with the first signal strength threshold and the second signal strength threshold to obtain a first comparison result.

[0120] The first signal strength threshold is greater than the second signal strength threshold.

[0121] Step S900: When the first comparison result shows that the current signal strength value is greater than or equal to the first signal strength threshold, the current signal gain value is reduced to obtain a target signal gain value when receiving a downlink data signal.

[0122] Step S1000: when the first comparison result is that the current signal strength value is less than the second signal strength threshold, increase the current signal gain value to obtain a target signal gain value when receiving a downlink data signal.

[0123] It should be noted that the terminal station can be a terminal station in a wireless communication system such as a WiFi system, LTE system, GSM (Global System for Mobile Communication) system, UMTS (Universal Mobile Telecommunications System), CDMA (Code Division Multiple Access) system or WiMAX (Worldwide Interoperability for Microwave Access) system.

[0124] The gain adjustment in the terminal station is implemented through an AGC (Automatic Gain Control) circuit. The AGC circuit may include a variable gain unit. During the gain adjustment process, the downlink data signal is the output signal of the variable gain unit, and the adjustment object of the gain adjustment method is the signal gain of the variable gain unit.

[0125] The current downlink data signal is the downlink data signal at the current moment, the current signal gain value is the signal gain value when the variable gain unit receives the current downlink data signal, the target signal gain value is the signal gain value when the variable gain unit receives the downlink data signal after the current moment, and the first signal strength threshold and the second signal strength threshold can be determined according to the hardware conditions of the terminal station. The specific implementation of the first signal strength threshold and the second signal strength threshold is as follows.

[0126] In a feasible implementation manner, before step S800, the gain adjustment method further includes: determining a first signal strength threshold and a second signal strength threshold based on the number of sampling bits when obtaining the current signal strength value.

[0127] It should be noted that the sampling bit number is the number of bits that the AGC circuit uses to discretely sample the downlink data signal when estimating the signal strength value of the downlink data signal. The sampling bit number can be 8 bits, 16 bits, etc., and the sampling bit number is determined according to the hardware conditions of the AGC circuit in actual use.

[0128] In a feasible implementation manner, the first signal strength threshold is determined by the following formula:

[0129]

[0130] a is the first signal strength threshold, It is the preset sampling fixed point value, and the value range is 1 to 2 μ , μ is the number of sampling bits, τ is the preset redundancy value;

[0131] The second signal strength threshold is determined by the following formula:

[0132]

[0133] b is the second signal strength threshold.

[0134] It should be noted that the number of sampling points of the AGC circuit is 1 to 2 μ , preset sampling fixed point value Preferably,

[0135] In addition, different hardware AGC circuits may have different sampling errors and calculation accuracies, so an additional preset redundancy value τ may be added to reduce the sampling error of the AGC circuit and improve the calculation accuracy of the first signal strength threshold and the second signal strength threshold. For example, the preset redundancy value may be set to 3 to 7, and preferably, the preset redundancy value is set to τ=5.

[0136] In a specific implementation, the AGC circuit can collect the current downlink data signal output by the variable gain unit, estimate the signal strength of the current downlink data signal, and after obtaining the current signal strength value, compare the current signal strength value with the first signal strength threshold and the second signal strength threshold to obtain a first comparison result, and increase or decrease the current signal gain value of the variable gain unit according to the first comparison result to obtain the target signal gain value of the variable gain unit. The AGC circuit can estimate the signal strength of the current downlink data signal by the following implementation.

[0137] In a feasible implementation, step S700 may include steps A710 to A730:

[0138] Step A710, discretely sample the received current downlink data signal to obtain a plurality of current sampling signals.

[0139] Step A720, performing fast Fourier transform on each current sampling signal to obtain a corresponding plurality of current spectrum data.

[0140] Step A730, determining the current signal strength value of the current downlink data signal based on the current spectrum data.

[0141] It should be noted that the AGC circuit may include an ADC (Analog-to-Digital Converter), and discrete sampling can be implemented by the ADC. The number of sampling bits is the number of sampling bits of the ADC. The number of current sampling signals is determined by the number of sampling points of the ADC, where the number of sampling points is 1 to 2. μ .

[0142] It is understandable that after the ADC collects multiple current sampling signals, the AGC circuit performs fast Fourier transform on each current sampling signal to obtain the corresponding current spectrum data, and then, based on all the current spectrum data, the current signal strength value of the current downlink data signal can be estimated.

[0143] In one example, the sampling bit number is 8. The ADC can intercept the 284-point initial sampling signal in the received current downlink data signal, and then remove the 28-point CP (Cyclic Prefix) points in the initial sampling signal to obtain a 256-point current sampling signal x[n], where n=0, 1, 2, 3, ..., 255.

[0144] Then, the 256-point current sampling signal x[n] is converted to the frequency domain through the fast Fourier transform FFT to obtain the 256-point current spectrum data X[k], where

[0145]

[0146] N=256, k=0,1,2,3,...,255.

[0147] Finally, the RSSI (Reference Signal Strength Indicator) is calculated for the current downlink data signal in the frequency domain to obtain the current signal strength value RSSI, where:

[0148]

[0149] In a feasible implementation, step A730 may include: for each DC subcarrier in multiple current sampling signals, based on the adjacent spectrum data of the adjacent subcarriers of the DC subcarrier, determining the DC spectrum data of each DC subcarrier; based on the DC spectrum data and other spectrum data of other subcarriers other than each DC subcarrier in the current spectrum data, determining the current signal strength value.

[0150] It should be noted that there is a DC component leakage in the current downlink data signal of the terminal station, and the DC component leakage value is usually large, which will have a greater impact on the RSSI estimation, resulting in a large error in the estimated RSSI. Therefore, when estimating the current signal strength value, the impact of the DC component leakage needs to be considered.

[0151] In this embodiment, based on the data signal design of the IWCT system, the RE (Resource Element) corresponding to k=127, 128, and 129 is used as a DC subcarrier (DC subcarrier) in the frequency domain. Therefore, when estimating RSSI, the DC spectrum data of the DC subcarrier when k=127 is determined based on the adjacent spectrum data of the adjacent subcarrier when k=126, the DC spectrum data of the DC subcarrier when k=129 is determined based on the adjacent spectrum data of the adjacent subcarrier when k=130, and the DC spectrum data of the DC subcarrier when k=128 is determined based on the adjacent spectrum data of the adjacent subcarriers when k=127 and k=129. In this way, the influence of the DC component leakage in the current downlink data signal on the current signal strength value can be eliminated. Among them,

[0152] |X

[127] | 2 =|X

[126] | 2

[0153] |X

[129] | 2 =|X

[130] | 2

[0154]

[0155] It can be understood that other subcarriers are subcarriers other than the DC subcarrier among the multiple subcarriers corresponding to the multiple current sampling signals. After determining the DC spectrum data of the DC subcarrier based on the adjacent spectrum data of the adjacent subcarriers of the DC subcarrier, since the DC spectrum data is not directly obtained based on the DC subcarrier conversion, the RSSI estimated based on the DC spectrum data and other frequency deviation data of other subcarriers is not affected by the DC component leakage.

[0156] In addition, it is understandable that Figure 2As shown, when the current signal strength value is greater than or equal to the first signal strength threshold, it means that the current signal gain value when the terminal station receives the current downlink data signal is too large, resulting in the current signal strength value being too large. Therefore, it is necessary to reduce the current signal gain value to obtain the target signal gain value so that the signal strength of the downlink data signal received at the target signal gain value after the current moment is within the limit range of the first signal strength threshold and the second signal strength threshold.

[0157] like Figure 2 As shown, when the current signal strength value is less than the second signal strength threshold, it means that the current signal gain value when the terminal station receives the current downlink data signal is too small, resulting in the current signal strength value being too small. Therefore, it is necessary to increase the current signal gain value to obtain the target signal gain value so that the signal strength of the downlink data signal received at the target signal gain value after the current moment is within the limit range of the first signal strength threshold and the second signal strength threshold.

[0158] In addition, as in the implementation method described below, when the current signal strength value is less than the first signal strength threshold and greater than or equal to the second signal strength threshold, the current signal gain value also needs to be adjusted to adjust the target signal strength of the downlink data signal received at the target signal gain value after the current moment to the optimal signal strength value.

[0159] In a feasible implementation manner, after step S800, the gain adjustment method may further include step S1100:

[0160] Step S1100, when the first comparison result is that the current signal strength value is less than the first signal strength threshold and greater than or equal to the second signal strength threshold, adjust the current signal gain value based on the first signal strength difference between the current signal strength value and the first reference signal strength value to obtain the target signal gain value.

[0161] It should be noted that the first reference signal strength value may be an optimal signal strength value required for demodulation by the terminal station. The first reference signal strength value may be determined according to the hardware conditions of the terminal station. When the current signal strength value is less than the first signal strength threshold and greater than or equal to the second signal strength threshold, the current signal gain value may be adjusted based on the first signal strength difference to obtain a target signal gain value, and the target signal strength may be adjusted to the optimal signal strength value.

[0162] In addition, as described in the following implementation, adjusting the current signal gain value may also be implemented using different solutions.

[0163] In a feasible implementation manner, step S1100 may include steps A1101 to A1103:

[0164] Step A1101: Calculate a first signal strength difference between a current signal strength value and a first reference signal strength value.

[0165] Step A1102: when the first signal strength difference is less than zero, increase the current signal gain value to obtain a target signal gain value.

[0166] Step A1103: when the first signal strength difference is greater than zero, reduce the current signal gain value to obtain the target signal gain value.

[0167] It should be noted that when the first signal strength difference is less than zero, the current signal strength value is less than the first reference signal strength value, indicating that the current signal gain value when the terminal station receives the current downlink data signal is small, and the current signal gain value needs to be increased to obtain the target signal gain value, and the target signal strength is adjusted to be close to or equal to the first reference signal strength value.

[0168] When the first signal strength difference is greater than zero, the current signal strength value is greater than the first reference signal strength value, indicating that the current signal gain value when the terminal station receives the current downlink data signal is large, and it is necessary to reduce the current signal gain value to obtain the target signal gain value, and adjust the target signal strength to be close to or equal to the first reference signal strength value.

[0169] When the first signal strength difference is zero, the current signal strength value is equal to the first reference signal strength value, indicating that the current signal gain value when the terminal station receives the current downlink data signal is better, and the current signal gain value is directly used as the target signal gain value.

[0170] It can be understood that the scheme of reducing the current signal gain value and increasing the current signal gain is implemented as follows.

[0171] In a feasible implementation manner, the step of “reducing the current signal gain value to obtain the target signal gain value” may include:

[0172] Based on the first preset gain step value, reducing the current signal gain value to obtain a target signal gain value;

[0173] or,

[0174] Based on the first gain adjustment value, the current signal gain value is reduced to obtain the target signal gain value, and the first gain adjustment value is the smaller one between the absolute value of the first signal strength difference and the preset limit adjustment value.

[0175] The step of “increasing the current signal gain value to obtain the target signal gain value” may include:

[0176] Based on the second preset gain step value, increasing the current signal gain value to obtain a target signal gain value;

[0177] or,

[0178] Based on the second gain adjustment value, the current signal gain value is increased to obtain the target signal gain value, and the second gain adjustment value is the smaller one between the absolute value of the first signal strength difference and the preset limit adjustment value.

[0179] It should be noted that if Figure 2 As shown, when the gain is adjusted, the current signal gain value may be adjusted according to a preset gain step value, or the current signal gain value may be adjusted according to a gain adjustment value determined in real time.

[0180] It is understandable that the preset gain step value may include a first preset gain step value and a second preset gain step value. In different communication system scenarios, the attenuation of the signal will be different. Therefore, the first preset gain step value and the second preset gain step value can be determined according to the communication system scenario in which the terminal station is located. Preferably, in the same communication system scenario, the second preset gain step value is the same as the first preset gain step value. When the gain is adjusted according to the preset preset gain step value, the relationship between the current signal gain value and the target signal gain value is as follows:

[0181] Gain 目标 =Gain 当前 +Gain step1

[0182] Gain 目标 =Gain 当前 -Gain step1

[0183] Gain 目标 is the target signal gain value, Gain 当前 is the current signal gain value, Gain step1 It is the preset gain step value for the data transmission stage.

[0184] In addition, in order to adjust the target signal strength to the optimal signal strength value, the first gain adjustment value and the second gain adjustment value can be determined according to the first signal strength difference. At this time, in order to avoid the instability or poor performance of the communication system caused by excessive gain adjustment, a preset limit adjustment value can be set to limit the maximum range of the first gain adjustment value and the second gain adjustment value to avoid the gain adjustment value from affecting the stability of the communication system. Among them, the preset limit adjustment value can be set according to the signal change of the downlink data signal. For example, if the signal changes frequently and the terminal station needs to respond quickly, a larger preset limit adjustment value is required. If the signal changes slowly or the terminal station requires higher stability, a smaller preset limit adjustment value can be selected.

[0185] The gain adjustment value can be determined according to the following formula:

[0186] ΔGain=min(|RSSI-RSSI ref |,θ)

[0187] ΔGain is the gain adjustment value, RSSI ref is the reference signal strength value, and θ is the preset limit adjustment value.

[0188] When the gain adjustment is performed according to the gain adjustment value determined in real time, the relationship between the current signal gain value and the target signal gain value is as follows:

[0189]

[0190] In addition, it should be noted that the situation where the current signal strength value is greater than or equal to the first signal strength threshold, or the situation where the current signal strength value is less than the second signal strength threshold, is usually caused by the presence of signal anomalies or channel interference in the downlink data signal, that is, it is not that the actual current signal strength value exceeds the limit range of the first signal strength threshold and the second signal strength threshold, but that the measured current signal strength value is inaccurate. At this time, if the gain adjustment is performed based on the real-time determination of the signal strength difference, the target signal gain difference will be even more inaccurate.

[0191] Therefore, in this embodiment, if Figure 2 As shown, when the current signal strength value is greater than or equal to the first signal strength threshold, or the current signal strength value is less than the second signal strength threshold, the current signal gain value is adjusted according to the preset gain step value to obtain the target signal gain value. When the current signal strength value is less than the first signal strength threshold and greater than or equal to the second signal strength threshold, the current signal gain value is adjusted according to the gain adjustment value determined in real time to obtain the target signal gain value. This can avoid the inaccurate gain adjustment caused by the inaccurate measurement of the current signal strength value.

[0192] Therefore, this embodiment provides a gain adjustment method. In the data transmission stage, when the current signal strength value is greater than the first signal strength threshold, the current signal gain value is reduced, and when the current signal strength value is less than the second signal strength threshold, the current signal gain value is increased. In the case where the current signal strength value changes significantly, the gain adjustment is performed based on the first comparison result between the current signal strength value and the first signal strength threshold and the second signal strength threshold, so that the signal strength value of the received downlink data signal is limited by the first signal strength threshold and the second signal strength threshold, thereby avoiding directly performing gain adjustment based on the error signal, so that the signal strength of the subsequently received downlink data signal is too large to exceed the energy limit threshold, or too small to be zero, thereby improving the anti-interference ability of the gain adjustment method.

[0193] In addition, during the data transmission stage, if the current signal strength value is less than the first signal strength threshold and greater than or equal to the second signal strength threshold, gain adjustment is performed according to the gain adjustment value determined in real time; if the current signal strength value is greater than or equal to the first signal strength threshold, or the current signal strength value is less than the second signal strength threshold, gain adjustment is performed according to the preset gain step value. In the event that the current signal strength value changes significantly, gain adjustment can be performed using the preset gain step value, so that the signal strength value of the received downlink data signal can be quickly limited to a reasonable energy range, thereby improving the efficiency of the gain adjustment method; and when the current signal strength value is within the range between the first signal strength threshold and the second signal strength threshold, gain adjustment is performed according to the gain adjustment value determined in real time, so that the target signal gain can be accurately adjusted to the optimal value, thereby improving the accuracy of the gain adjustment method.

[0194] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be described in detail later. On this basis, step S700 may include: obtaining an initial signal strength value of the current downlink data signal. Based on at least one historical signal strength value, complementary filtering is performed on the current signal strength value to obtain the current signal strength value.

[0195] The current downlink data signal is the downlink data signal received at the current moment, and the historical signal strength value is the signal strength value of the historical downlink data signal received at the historical moment before the current moment.

[0196] It should be noted that the initial signal strength value is calculated using the signal strength value estimation method in the first embodiment above. Complementary filtering can include first-order complementary filtering and multi-order complementary filtering. Preferably, this embodiment performs first-order complementary filtering on the initial signal strength value according to the historical signal strength value of the historical downlink data signal of the frame closest to the current moment before the current moment to obtain the current signal strength value. Among them, the first-order complementary filtering is as follows:

[0197]

[0198] p is the frame number of the downlink data signal, is the current signal strength value of the downlink data signal of the pth frame, is the initial signal strength value of the downlink data signal of the pth frame, y 2 (p-1) is the historical signal strength value of the downlink data signal of the p-1th frame, and α is the filtering weight.

[0199] Therefore, this embodiment provides a gain adjustment method. In the data transmission stage, based on the historical signal strength value, complementary filtering is performed on the initial signal strength value of the current downlink data signal, which can remove DC signal interference in the current downlink data signal and improve the accuracy of the current signal strength obtained, thereby improving the accuracy of the gain adjustment method.

[0200] Based on the above embodiments of the present application, in the third embodiment of the present application, the same or similar contents as the above embodiments can be referred to the above introduction and will not be described in detail later. On this basis, step S700 may include: periodically obtaining the current signal strength value of the received current downlink data signal according to a preset adjustment period.

[0201] It should be noted that the signal strength value is related to the measurement stability and the complexity of the channel environment. If gain adjustment is performed for each frame of downlink data signal, the signal strength of the downlink data signal changes too frequently, which will cause serious jitter in the signal strength curve and affect the demodulation performance of the terminal station. Therefore, this embodiment lengthens the adjustment period, sets a preset adjustment period length at the terminal station, and periodically performs signal strength value detection and gain adjustment according to the preset adjustment period. Among them, the preset adjustment period can be set according to the communication system scenario. For example, in a static scenario, the preset adjustment period can be set to a longer period, and in a dynamic scenario, the preset adjustment period can be set to a shorter period.

[0202] It is understandable that since the gain adjustment is performed periodically according to the preset adjustment cycle, the target signal gain value obtained in the current adjustment cycle corresponding to the current moment will be used as the initial gain value of the next adjustment cycle after the current adjustment cycle.

[0203] In an exemplary gain adjustment process during the data transmission phase, as shown in FIG. Figure 3 As shown, the AGC circuit collects the current downlink data signal, estimates the signal strength of the current downlink data signal, and obtains an initial signal strength value; performs first-order complementary filtering on the initial signal strength value to obtain a current signal gain strength value; when the adjustment time corresponding to the preset adjustment period arrives, the current signal strength value is compared with the first signal strength threshold, the second signal strength threshold and the reference signal strength value, and the gain adjustment scheme is determined according to the comparison result, and the target signal gain value of the controllable gain unit is adjusted.

[0204] Therefore, this embodiment provides a gain adjustment method. In the data transmission stage, gain adjustment is performed periodically according to a preset adjustment period, rather than performing gain adjustment for each frame of downlink data signal. This can avoid frequent changes in signal strength caused by frequent gain adjustments and severe jitter in the signal strength curve. It takes into account the impact of the measurement stability of signal strength and the complexity of the channel environment on the demodulation performance, meets the needs of actual channel environment changes, further improves the anti-interference ability of the gain adjustment method, and saves gain adjustment resources to a certain extent.

[0205] Based on the above embodiments of the present application, in the fourth embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction, and will not be described in detail later. On this basis, before step S700, the gain adjustment method can also include steps S400 to S600:

[0206] Step S400: During the cell synchronization phase, a synchronization signal gain value is determined based on a target search signal gain value.

[0207] The target search signal gain value is the signal gain value when the frequency search is successful in the cell search phase.

[0208] Step S500: demodulate the received downlink synchronization signal based on the synchronization signal gain value to complete cell synchronization.

[0209] Step S600: taking the synchronization signal gain value as the current signal gain value and entering the data transmission phase.

[0210] It should be noted that the terminal station needs to go through the cell search stage and the cell synchronization stage, and synchronize with the target frequency of the cell in which it is located, before it can enter the data transmission stage and realize data transmission. Therefore, the terminal station can enter the cell synchronization stage based on the target search signal gain value when the frequency search is successful in the cell search stage, receive the DSS (Downlink synchronization signal) of the target frequency, and then determine the synchronization signal gain value based on the target search signal gain value, complete the cell synchronization, and enter the data transmission stage based on the synchronization signal gain value. Thus, the signal gain values ​​of the cell search stage, the cell synchronization stage, and the data transmission stage are connected.

[0211] The target frequency is the frequency when the frequency search is successful during the cell search phase. DSS can include MSI (Master Synchronization Signal) and SSI (Supplementary Synchronization Signal). By demodulating MSI and SSI, the configuration information of the terminal station, that is, the data configuration parameters during the data transmission phase, can be obtained to complete cell synchronization.

[0212] It can be understood that, as described in the following implementation, the synchronization signal gain value in the cell synchronization phase can be obtained by adjusting the target search signal gain value in the cell search phase.

[0213] In a feasible implementation, step S400 may include steps A410 to A430:

[0214] Step A410: Based on a second signal strength difference between a synchronization signal strength value of a downlink synchronization signal and a second reference signal strength value, a target search signal gain value is adjusted to obtain an initial synchronization signal gain value.

[0215] Step A420, comparing the initial synchronization signal gain value with the first gain threshold and the second gain threshold to obtain a second comparison result.

[0216] The first gain threshold is greater than the second gain threshold.

[0217] Step A430, determining the synchronization signal gain value based on the second comparison result.

[0218] It should be noted that the calculation method of the synchronization signal strength value is the same as the calculation method of the current signal strength value in the above embodiment. The second reference signal strength value can be determined according to the hardware conditions of the terminal station. Preferably, the second reference signal strength value is the same as the first reference signal strength value, and both are optimal signal strength values. The initial synchronization signal gain value is the signal gain value after adjusting the target search signal gain value according to the second signal strength difference. The first gain threshold and the second gain threshold correspond to the maximum gain value and the minimum gain value of the terminal station receiving the downlink data signal, respectively, and the first gain threshold and the second gain threshold can be determined according to the hardware conditions of the terminal station.

[0219] It can be understood that the method of adjusting the target search signal gain value may include: when the second signal strength difference is less than zero, increasing the target search signal gain value according to the second signal strength difference to obtain the initial synchronization signal gain value; when the second signal strength difference is greater than zero, reducing the target search signal gain value according to the second signal strength difference to obtain the initial synchronization signal gain value; when the second signal strength difference is equal to zero, using the target search signal gain value as the initial synchronization signal gain value.

[0220] In addition, since the variable gain units with different hardware conditions correspond to different first gain thresholds and second gain thresholds, after determining the initial synchronization signal gain value, the initial synchronization signal gain value can also be compared with the first gain threshold and the second gain threshold, and the final synchronization signal gain value can be determined according to the second comparison result. In the following implementation, according to different second comparison results, the synchronization signal gain value can be determined from the initial synchronization signal gain value, the first gain threshold and the second gain threshold.

[0221] In a feasible implementation, step A430 may include steps A431 to A433:

[0222] Step A431: When the second comparison result is that the initial synchronization signal gain value is less than or equal to the first gain threshold and greater than or equal to the second gain threshold, the initial synchronization signal gain value is used as the synchronization signal gain value.

[0223] Step A432: When the second comparison result shows that the initial synchronization signal gain value is greater than the first gain threshold, the first gain threshold is used as the synchronization signal gain value.

[0224] Step A433: When the second comparison result shows that the initial synchronization signal gain value is less than the second gain threshold, the second gain threshold is used as the synchronization signal gain value.

[0225] It should be noted that when the initial synchronization signal gain value is less than or equal to the first gain threshold and greater than or equal to the second gain threshold, it means that the hardware conditions of the variable gain unit of the terminal station meet the initial synchronization signal gain value requirements, and the initial synchronization signal gain value is directly used as the synchronization signal gain value.

[0226] When the initial synchronization signal gain value is greater than the first gain threshold, it indicates that the hardware conditions of the terminal station do not meet the initial synchronization signal gain value requirements, and the first gain threshold closer to the initial synchronization signal gain value is used as the synchronization signal gain value.

[0227] When the initial synchronization signal gain value is less than the first gain threshold, it indicates that the hardware conditions of the terminal station do not meet the initial synchronization signal gain value requirements, and the first gain threshold closer to the initial synchronization signal gain value is used as the synchronization signal gain value.

[0228] It is understandable that, when the initial synchronization signal gain value is not within the limit range of the first gain threshold and the second gain threshold, a performance warning may be triggered to prompt an abnormal situation of the initial synchronization signal gain value.

[0229] In one example, if the target search signal gain value in the cell search phase is 60dB, 60dB is used as a priori condition to enter the cell synchronization phase. If the second signal strength difference is -25, the initial synchronization signal gain value can be obtained to be 85dB. At this time, if the first gain threshold is 80dB, the MSI and SSI will be demodulated with a synchronization signal gain value of 80dB to complete cell synchronization, and based on the signal gain value of 80dB, the data transmission phase is entered.

[0230] Therefore, this embodiment provides a gain adjustment method, in which the output signal gain value of each stage is used as a priori condition for the next stage at different stages, so that different stages are efficiently connected, the gain adjustment time of different stages is reduced, and the occurrence of initial error packets in different stages is reduced.

[0231] Based on the above embodiments of the present application, in the fifth embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction, and will not be described in detail later. Figures 4 to 8 , Figure 4 is an exemplary DDS false detection rate simulation curve under different signal strengths, Figure 5 is an exemplary DSS false detection rate simulation curve when the signal strength is 0dBFS, Figure 6 This is a flow chart of an implementation method of the cell search phase of the gain adjustment method of the present application. Figure 7 This is a schematic diagram of the change of the current search signal gain during the cell search phase of this application. Figure 8 This is a flowchart of an implementation method of the cell search phase and the cell synchronization phase of the gain adjustment method of the present application.

[0232] On this basis, before step S400, the gain adjustment method may further include steps S100 to S300:

[0233] Step S100: In the cell search phase, a frequency point traversal search is performed based on the current search signal gain value.

[0234] Step S200, when the frequency point search fails, adjust the current search signal gain value, and return to the step of performing a frequency point traversal search based on the current search signal gain value.

[0235] Step S300: When the frequency search is successful, the cell synchronization phase is entered.

[0236] It should be noted that, in the cell search stage, this embodiment can perform a frequency traversal search in all frequency points of the cell where the terminal station is located under different current search signal gain values. During each frequency traversal search, there is no need to estimate the signal strength. It only needs to determine whether the downlink synchronization signal of each frequency point can be searched under the current search signal gain value to determine whether the frequency search is successful and complete the cell search.

[0237] Among them, the current search signal gain value during the initial frequency point traversal search can be determined according to the first gain threshold and the second gain threshold. For example, the current search signal gain value during the initial frequency point traversal search can be the first gain threshold, the second gain threshold, or a target gain threshold between the first gain threshold and the second gain threshold. Preferably, the current search signal gain value during the initial frequency point traversal search is determined according to the following implementation.

[0238] In a feasible implementation, before step S100, the gain adjustment method may further include: determining an initial signal gain value based on a preset percentage of a gain difference between the first gain threshold and the second gain threshold; and using the initial signal gain value as a current search signal gain value.

[0239] It should be noted that, during the cell search phase, the initial signal gain value is the signal gain value during the initial frequency point traversal search. Figure 4 As shown in the figure, in the IWCT system, from the DDS false detection rate simulation curve under different signal strengths, it can be seen that when the DDS signal strength is about -20dBFS, the DSS false detection rate of the cell search can meet the requirement of less than 10. -3 performance requirements. Figure 5 As shown, from the DSS false detection rate simulation curve when the signal strength is 0dBFS, it can be seen that when the signal strength is 0dBFS, the DDS of the terminal station is saturated when it overflows. Therefore, the initial signal gain value in the cell search phase can be determined based on the performance characteristics of the DDS and the dynamic range between the first gain threshold and the second gain threshold. In addition, since the initial signal gain value cannot be set too small, and the cell search fails when the initial signal gain value is too large, it is necessary to increase the current search signal gain value to achieve a higher cell search success rate. Therefore, in this embodiment, the initial signal gain value Gain start The calculation formula is as follows:

[0240] Gain start =ΔG / 2

[0241] Wherein, ΔG is the gain difference between the first gain threshold and the second gain threshold, and the preset percentage is one-half.

[0242] It is understandable that, during the cell search phase, adjusting the current search signal gain value may include increasing the current search signal gain value and / or decreasing the current search signal gain value. Preferably, the adjustment scheme of the current search signal gain value is as follows.

[0243] In a feasible implementation, step S200 may include steps A210 to A240:

[0244] Step A210: When the frequency search fails, the current search signal gain value is compared with the initial signal gain value, the first gain threshold and the second gain threshold.

[0245] Step A220: when the current search signal gain value is greater than or equal to the initial signal gain value and less than the first gain threshold, increase the current search signal gain value.

[0246] Step A230: When the current search signal gain value is greater than or equal to the first gain threshold, the initial signal gain value is used as the current search signal gain value, and the current search signal gain value is reduced.

[0247] Step A240: When the current search signal gain value is less than the initial signal gain value and greater than the second gain threshold, reduce the current search signal gain value.

[0248] It should be noted that if Figure 6 and Figure 7 As shown, in this embodiment, during the cell search stage, the initial signal gain value is used as the current search signal gain value Gain, and after a frequency traversal search is performed, if the frequency search fails, the first round of frequency traversal search is performed by first increasing the current search signal gain value between the first gain threshold and the second gain threshold; if the first round of frequency search fails, the initial signal gain value is used as the current search signal gain value, and then the second round of frequency traversal search is performed by reducing the current search signal gain value, so as to realize frequency traversal search between the first gain threshold and the second gain threshold and under different current search signal gains.

[0249] Among them, in the second round of frequency traversal search, if the current search signal gain value is greater than the first gain threshold, it is determined that the first round of frequency search has failed, and the second round of frequency traversal search is entered. In the second round of frequency traversal search, if the current search signal gain value is less than the second gain threshold, if the frequency search has failed, it is determined that the cell search has failed, and the cell synchronization phase is not entered.

[0250] It can be understood that, as in the following implementation, since the signal strength value estimation is not performed in the cell search stage, the current search signal gain value can be adjusted according to the preset gain step.

[0251] In a feasible implementation manner, the step of "increasing the current search signal gain value" may include: increasing the current search signal gain value based on a third preset gain step value.

[0252] The step of “reducing the current search signal gain value” may include: reducing the current search signal gain value based on a fourth preset gain step value.

[0253] It should be noted that the third preset gain step value and the fourth preset gain step value can also be determined according to the communication system scenario in which the terminal station is located. Among them, if the third preset gain step value and the fourth preset gain step value are set smaller, the probability of successful cell search is higher, and the corresponding current search signal gain value will be more accurate as a priori condition of the cell synchronization stage, but it will cause the cycle of the cell search stage to be longer. Therefore, the better third preset gain step value and fourth preset gain step value can be determined by performing an actual measured time analysis on the cell search stage between the first gain threshold and the second gain threshold.

[0254] It is understandable that the third preset gain step value and the fourth preset gain step value may be the same, such as Figure 6 and Figure 7 As shown, the third preset gain step value and the fourth preset gain step value are both Gain step2 . And the third preset gain step value and the fourth preset gain step value are greater than the first preset gain step value and the second preset gain step value. This is because after the cell search stage and the cell synchronization stage, after entering the data transmission stage, the current signal gain value determined according to the target search signal gain value is closer to the optimal signal gain value of the communication system. Therefore, the preset gain step value Gain in the data transmission stage can be set. step1 Smaller than the preset gain step value Gain in the cell search phase step2 In one example, the third preset gain step value and the fourth preset gain step value are both set to 20 dB.

[0255] In summary, if Figure 8As shown, the complete process of the cell search phase and the cell synchronization phase in the gain adjustment method of this embodiment is: in the cell search phase, adjust the current search signal gain value of the variable gain unit, perform frequency traversal search, and if the cell search fails, issue an early warning. If the cell search is successful, enter the cell synchronization phase and record the current search signal gain value. In the cell synchronization phase, perform ADC sampling and signal strength estimation on the DSS to obtain the synchronization signal strength value; compare the synchronization signal strength value with the reference signal strength, adjust the recorded current search signal gain value, and obtain the initial synchronization signal gain value; compare the initial synchronization signal gain value with the first gain threshold and the second gain threshold, determine the synchronization signal gain value, complete cell synchronization, and enter the data transmission phase based on the synchronization signal gain value. Among them, when the initial synchronization signal gain value is not between the first gain threshold and the second gain threshold, a performance early warning can also be issued.

[0256] Therefore, this embodiment provides a gain adjustment method. In the cell search stage, a frequency traversal search is performed in all frequency points of the cell where the terminal station is located under different current search signal gain values. During each frequency traversal search, there is no need to estimate the signal strength. It is only necessary to determine whether the downlink synchronization signal of each frequency point can be searched under the current search signal gain value to determine whether the frequency search is successful and complete the cell search, thereby saving the time for estimating the signal strength in the cell search stage and reducing the cell search time.

[0257] Moreover, during the cell search phase, the current search signal gain value is limited between a first gain threshold and a second gain threshold. When the cell search is successful, the corresponding current search signal gain value can be directly set as the initial signal gain value of the cell synchronization phase. As a priori information, the downlink synchronization signal of the cell synchronization phase is adjusted to a reasonable energy value in the shortest time, thereby avoiding the occurrence of downlink synchronization signal error packets.

[0258] The present application provides a gain adjustment device, such as Fig. 9 As shown, the gain adjustment device may include:

[0259] The acquisition module 10 is used to obtain the current signal strength value of the current downlink data signal received during the data transmission phase;

[0260] A comparison module 20, configured to compare the current signal strength value with a first signal strength threshold and a second signal strength threshold to obtain a first comparison result, wherein the first signal strength threshold is greater than the second signal strength threshold;

[0261] A first adjustment module 30, configured to reduce the current signal gain value to obtain a target signal gain value when receiving a downlink data signal when the first comparison result is that the current signal strength value is greater than or equal to the first signal strength threshold;

[0262] The second adjustment module 40 is configured to increase the current signal gain value to obtain a target signal gain value when receiving a downlink data signal when the first comparison result is that the current signal strength value is less than a second signal strength threshold.

[0263] The present application provides a terminal station, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the gain adjustment method in the above-mentioned embodiment 1.

[0264] Reference below Fig.10 , which shows a schematic diagram of the structure of a terminal station suitable for implementing the embodiment of the present application. The terminal station in the embodiment of the present application may include but is not limited to mobile terminals such as laptop computers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), etc., and fixed terminals such as desktop computers, etc. Fig.10 The terminal station shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0265] like Fig.10As shown, the terminal station may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the terminal station are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the terminal station to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows a terminal station with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0266] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0267] The terminal station provided by the present application adopts the gain adjustment method in the above embodiment, which can solve the technical problem of how to improve the anti-interference ability of the gain adjustment method. Compared with the related art, the beneficial effects of the terminal station provided by the present application are the same as the beneficial effects of the gain adjustment method provided by the above embodiment, and the other technical features in the terminal station are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0268] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0269] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0270] The present application provides a communication system, which may include:

[0271] Such as the terminal station mentioned above.

[0272] It should be noted that the communication system may include at least one terminal station. The communication system may also include a base station.

[0273] For more implementation details in the specific implementation of the terminal station in this embodiment, please refer to the description of the specific implementation of the terminal station in the above embodiment. For the sake of brevity of the description, they will not be repeated here.

[0274] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the gain adjustment method in the above-mentioned embodiment.

[0275] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0276] The computer-readable storage medium may be included in the terminal station; or may exist independently without being installed in the terminal station.

[0277] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the terminal station, the terminal station: in the data transmission stage, obtains the current signal strength value of the current downlink data signal received; compares the current signal strength value with the preset signal strength range to obtain a first comparison result; when the first comparison result is that the current signal strength value is greater than or equal to the first signal strength threshold, reduces the current signal gain value to obtain the target signal gain value when receiving the downlink data signal; when the first comparison result is that the current signal strength value is less than the second signal strength threshold, increases the current signal gain value to obtain the target signal gain value when receiving the downlink data signal.

[0278] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0279] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0280] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0281] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned gain adjustment method, and can solve the technical problem of how to improve the anti-interference ability of the gain adjustment method. Compared with the related art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the gain adjustment method provided by the above-mentioned embodiment, and will not be repeated here.

[0282] The present application also provides a computer program product, including a computer program, which implements the steps of the gain adjustment method as described above when the computer program is executed by a processor.

[0283] The computer program product provided by the present application can solve the technical problem of how to improve the anti-interference ability of the gain adjustment method. Compared with the related art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the gain adjustment method provided by the above embodiment, which will not be repeated here.

[0284] The above are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A gain adjustment method, characterized in that: The gain adjustment method comprises: In the data transmission phase, the current signal strength value of the received current downlink data signal is obtained; Compare the current signal strength value with a first signal strength threshold and a second signal strength threshold to obtain a first comparison result, wherein the first signal strength threshold is greater than the second signal strength threshold; When the first comparison result is that the current signal strength value is greater than or equal to the first signal strength threshold, reducing the current signal gain value to obtain a target signal gain value when receiving a downlink data signal; When the first comparison result is that the current signal strength value is less than the second signal strength threshold, the current signal gain value is increased to obtain a target signal gain value when receiving a downlink data signal.

2. The gain adjustment method according to claim 1, wherein: Before the step of comparing the current signal strength value with the first signal strength threshold and the second signal strength threshold to obtain a first comparison result, the gain adjustment method further includes: The first signal strength threshold and the second signal strength threshold are determined based on the number of sampling bits when the current signal strength value is obtained.

3. The gain adjustment method according to claim 2, wherein: The first signal strength threshold is determined by the following formula: a is the first signal strength threshold, It is the preset sampling fixed point value, and the value range is 1 to 2 μ , μ is the number of sampling bits, τ is the preset redundancy value; The second signal strength threshold is determined by the following formula: b is the second signal strength threshold.

4. The gain adjustment method according to claim 1, wherein: After the step of comparing the current signal strength value with the first signal strength threshold and the second signal strength threshold to obtain a first comparison result, the gain adjustment method further includes: When the first comparison result is that the current signal strength value is less than the first signal strength threshold and greater than or equal to the second signal strength threshold, the current signal gain value is adjusted based on the first signal strength difference between the current signal strength value and the first reference signal strength value to obtain the target signal gain value.

5. The gain adjustment method according to claim 4, characterized in that: The step of adjusting the current signal gain value based on a first signal strength difference between the current signal strength value and a first reference signal strength value to obtain the target signal gain value comprises: Calculating the first signal strength difference between the current signal strength value and the first reference signal strength value; When the first signal strength difference is less than zero, increasing the current signal gain value to obtain the target signal gain value; When the first signal strength difference is greater than zero, the current signal gain value is reduced to obtain the target signal gain value.

6. The gain adjustment method according to claim 4 or 5, characterized in that: The step of reducing the current signal gain value to obtain the target signal gain value comprises: Based on a first preset gain step value, reducing the current signal gain value to obtain the target signal gain value; or, Based on a first gain adjustment value, reducing the current signal gain value to obtain the target signal gain value, wherein the first gain adjustment value is the smaller of an absolute value of the first signal strength difference and a preset limit adjustment value; The step of increasing the current signal gain value to obtain the target signal gain value comprises: Based on a second preset gain step value, increasing the current signal gain value to obtain the target signal gain value; or, The target signal gain value is obtained by increasing the current signal gain value based on a second gain adjustment value, wherein the second gain adjustment value is the smaller one between the absolute value of the first signal strength difference and the preset limit adjustment value.

7. The gain adjustment method according to claim 1, wherein: The step of obtaining the current signal strength value of the currently received downlink data signal comprises: Acquire an initial signal strength value of a currently received downlink data signal, where the currently received downlink data signal is a downlink data signal currently received; Based on at least one historical signal strength value, complementary filtering is performed on the current signal strength value to obtain the current signal strength value, where the historical signal strength value is a signal strength value of a historical downlink data signal received at a historical moment before the current moment.

8. The gain adjustment method according to claim 1, wherein: The step of obtaining the current signal strength value of the currently received downlink data signal comprises: According to a preset adjustment period, a current signal strength value of the currently received downlink data signal is periodically obtained.

9. The gain adjustment method according to claim 1, wherein: The step of obtaining the current signal strength value of the currently received downlink data signal comprises: Discretely sampling the received current downlink data signal to obtain multiple current sampling signals; Performing a fast Fourier transform on each of the current sampling signals to obtain a corresponding plurality of current spectrum data; Based on the current spectrum data, a current signal strength value of the current downlink data signal is determined.

10. The gain adjustment method according to claim 9, wherein: The step of determining the current signal strength value of the current downlink data signal based on the current spectrum data includes: For each DC subcarrier in the multiple current sampling signals, based on the adjacent spectrum data of the adjacent subcarriers of the DC subcarrier, determine the DC spectrum data of each DC subcarrier; The current signal strength value is determined based on the DC spectrum data and other spectrum data of other subcarriers other than the DC subcarriers in the current spectrum data.

11. The gain adjustment method according to claim 1, wherein: Before the step of obtaining the current signal strength value of the currently received downlink data signal during the data transmission phase, the gain adjustment method further includes: In the cell synchronization stage, a synchronization signal gain value is determined based on a target search signal gain value, where the target search signal gain value is a signal gain value when a frequency search is successful in the cell search stage; Based on the synchronization signal gain value, demodulate the received downlink synchronization signal to complete cell synchronization; The synchronization signal gain value is used as the current signal gain value, and the data transmission phase is entered.

12. The gain adjustment method according to claim 11, wherein: The step of determining the synchronization signal gain value based on the target search signal gain value comprises: Adjusting the target search signal gain value based on a second signal strength difference between the synchronization signal strength value of the downlink synchronization signal and the second reference signal strength value to obtain an initial synchronization signal gain value; Comparing the initial synchronization signal gain value with a first gain threshold and a second gain threshold to obtain a second comparison result, wherein the first gain threshold is greater than the second gain threshold; Based on the second comparison result, the synchronization signal gain value is determined.

13. The gain adjustment method according to claim 12, wherein: The step of determining the synchronization signal gain value based on the second comparison result comprises: When the second comparison result is that the initial synchronization signal gain value is less than or equal to the first gain threshold and greater than or equal to the second gain threshold, use the initial synchronization signal gain value as the synchronization signal gain value; When the second comparison result is that the initial synchronization signal gain value is greater than the first gain threshold, using the first gain threshold as the synchronization signal gain value; When the second comparison result is that the initial synchronization signal gain value is less than the second gain threshold, the second gain threshold is used as the synchronization signal gain value.

14. The gain adjustment method according to claim 11, wherein: Before the step of determining the synchronization signal gain value based on the target search signal gain value in the cell synchronization stage, the gain adjustment method further includes: In the cell search phase, frequency point traversal search is performed based on the current search signal gain value; In the case where the frequency search fails, adjusting the current search signal gain value, and returning to execute the step of performing frequency point traversal search based on the current search signal gain value; If the frequency search is successful, the cell synchronization phase begins.

15. The gain adjustment method according to claim 14, wherein: Before the step of performing frequency point traversal search based on the current search signal gain value, the gain adjustment method further includes: determining an initial signal gain value based on a preset percentage of a gain difference between a first gain threshold and a second gain threshold; The initial signal gain value is used as the current search signal gain value.

16. The gain adjustment method according to claim 15, wherein: The step of adjusting the gain value of the current search signal when the frequency search fails comprises: In the case where the frequency search fails, comparing the current search signal gain value with the initial signal gain value, the first gain threshold and the second gain threshold; In a case where the current search signal gain value is greater than or equal to the initial signal gain value and less than the first gain threshold, increasing the current search signal gain value; In a case where the current search signal gain value is greater than or equal to the first gain threshold, using the initial signal gain value as the current search signal gain value, and reducing the current search signal gain value; When the current search signal gain value is smaller than the initial signal gain value and larger than the second gain threshold, the current search signal gain value is reduced.

17. The gain adjustment method according to claim 16, wherein: The step of increasing the current search signal gain value comprises: Based on a third preset gain step value, increasing the current search signal gain value; The step of reducing the current search signal gain value comprises: Based on a fourth preset gain step value, the current search signal gain value is reduced.

18. A gain adjustment device, characterized in that: The gain adjustment device comprises: An acquisition module is used to acquire the current signal strength value of the current downlink data signal received during the data transmission phase; a comparison module, configured to compare the current signal strength value with a first signal strength threshold and a second signal strength threshold to obtain a first comparison result, wherein the first signal strength threshold is greater than the second signal strength threshold; A first adjustment module, configured to reduce a current signal gain value to obtain a target signal gain value when receiving a downlink data signal when the first comparison result is that the current signal strength value is greater than or equal to the first signal strength threshold; The second adjustment module is used to increase the current signal gain value to obtain a target signal gain value when receiving a downlink data signal when the first comparison result is that the current signal strength value is less than the second signal strength threshold.

19. A terminal station, characterized in that: The terminal station comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the gain adjustment method according to any one of claims 1 to 17.

20. A communication system, characterized in that: The communication system comprises: The terminal station as claimed in claim 19.

21. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the gain adjustment method according to any one of claims 1 to 17 are implemented.

22. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the gain adjustment method according to any one of claims 1 to 17 are implemented.

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