A fixed-gain dynamic adjustment system, method and device for a radio frequency receiving channel

Abstract

The present invention discloses a fixed-gain dynamic adjustment system, method and device for a radio frequency receiving channel. The output power detector detects the power output by the analog intermediate frequency adjustable gain module and compares it with a preset threshold. According to different output power levels, the gain values of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module are adjusted respectively. When a large signal is input, the dynamic gain adjustment is placed on the analog intermediate frequency device with better linearity to optimize linearity, so that the system can withstand higher signal power. When a small signal is input, since the input signal decreases, the relatively low linearity index can also keep the channel in a linear amplification state at this time. The dynamic gain adjustment is placed on the radio frequency front-end with better noise performance to optimize the signal-to-noise ratio. By detecting the output power to adjust the gain allocation of the radio frequency front-end and the analog intermediate frequency, under the condition of realizing fixed-gain adjustment inside the radio frequency receiving channel, the dynamic range of the channel is extended.

Description

Technical Field

[0001] The present invention relates to the technical field of receiving channel gain adjustment, and particularly to a fixed-gain dynamic adjustment system, method and device for a radio frequency receiving channel. Background Art

[0002] Currently, in a radio frequency receiving system, two very important performance indicators are the noise figure NF and the input third-order intercept point IIP3. Among them, the noise figure NF is used to evaluate the noise performance of the system, and the smaller its value, the better the noise performance. The input third-order intercept point IIP3 is used to evaluate the nonlinear distortion of the system, and the larger its value, the better the linear performance. Generally speaking, the radio frequency front end has a relatively high operating frequency and is located at the front stage of the system, and needs to have a certain gain and good noise performance. However, due to its relatively high operating frequency, its nonlinear distortion performance is relatively poor. Correspondingly, the analog intermediate frequency module has good nonlinear distortion performance, but relatively poor noise performance.

[0003] In some anti-jamming receiver systems, such as an anti-jamming navigation receiving system, it is required that the analog receiving channel before the analog-to-digital converter maintains a fixed gain, that is, the automatic gain control is not used to change the gain of the radio frequency receiving channel. When the analog receiving channel maintains a fixed gain, the dynamic range of the receiver system will be restricted by the devices on the receiving link, and the input signal being too large or too small cannot work properly. If you want to increase the dynamic range, high-dynamic-range devices need to be used on the link, for example, a radio frequency front end with low noise and high linearity, an on-chip filter, etc. However, this will increase costs such as power consumption and area.

[0004] A patent with the application number 201110445192.3 discloses an automatic gain control method that can maintain a fixed gain of the system link. After the analog signal is quantized by an ADC, the power value of the input signal is detected in real time in the digital domain by using a power detection method based on the statistical characteristics of the peak power of the sampling points, and the detection result is transmitted to the gain control unit. The gain control unit adjusts the analog gain and the digital gain respectively according to the detection result given by the power detection unit. However, this method requires quantizing the analog signal by an ADC and performing power detection and comparison in the digital domain, and cannot keep the gain of the analog channel before the ADC fixed. Summary of the Invention

[0005] In view of the above defects, embodiments of the present invention disclose a fixed-gain dynamic adjustment system, method and device for a radio frequency receiving channel, which can adjust the gains of the radio frequency and the intermediate frequency on the premise of keeping the total gain of the radio frequency front end and the analog intermediate frequency unchanged.

[0006] The first aspect of the embodiment of the present invention discloses a system for dynamically adjusting the fixed gain of a radio frequency receiving channel, including: a radio frequency front-end adjustable gain module, an analog intermediate frequency adjustable gain module, an output power detector, and a gain switch controller. The radio frequency front-end adjustable gain module is connected to an external input. The output end of the radio frequency front-end adjustable gain module is connected to the input end of the analog intermediate frequency adjustable gain module. The output end of the analog intermediate frequency adjustable gain module is connected to the input end of the output power detector. The output end of the output power detector is connected to the input end of the gain switch controller. The output control ends of the gain switch controller are respectively connected to the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module.

[0007] As an optional implementation manner, in the first aspect of the embodiment of the present invention, the radio frequency front-end adjustable gain module includes a low-noise amplifier and a mixer connected to each other. The low-noise amplifier is connected to an external input, and the mixer is also connected to the analog intermediate frequency adjustable gain module.

[0008] As an optional implementation manner, in the first aspect of the embodiment of the present invention, the analog intermediate frequency adjustable gain module includes an intermediate frequency low-pass filter and a programmable gain amplifier connected to each other. The intermediate frequency low-pass filter is also connected to the mixer, and the programmable gain amplifier is also connected to the output power detector.

[0009] As an optional implementation manner, in the first aspect of the embodiment of the present invention, the radio frequency front-end adjustable gain module includes a first gain value and a second gain value, and the first gain value is less than the second gain value.

[0010] As an optional implementation manner, in the first aspect of the embodiment of the present invention, the analog intermediate frequency adjustable gain module includes a third gain value and a fourth gain value, and the third gain value is less than the fourth gain value.

[0011] The second aspect of the embodiment of the present invention discloses a method for dynamically adjusting the fixed gain of a radio frequency receiving channel, including:

[0012] Controlling the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module to be in an initial switch state respectively through the gain switch controller to maintain an initial fixed gain; the initial fixed gain includes that the radio frequency front-end adjustable gain module corresponds to the second gain value and the intermediate frequency adjustable gain module corresponds to the third gain value;

[0013] Collecting the output power, comparing the output power with a set threshold to obtain a comparison result;

[0014] Based on the comparison result, adjusting the switch states of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module through the gain switch controller.

[0015] As an alternative embodiment, in the second aspect of the embodiments of the present invention, the set threshold includes a first threshold and a second threshold, and the first threshold is less than the second threshold; the comparison result includes that the output power is greater than the first threshold and less than the second threshold, the output power is less than the first threshold, and the output power is greater than the second threshold; the switch state includes an initial switch state, a first switch state, and a second switch state. The first switch state corresponds to the radio frequency front-end adjustable gain module being at a first gain value and the intermediate frequency adjustable gain module being at a fourth gain value, and the second switch state corresponds to the radio frequency front-end adjustable gain module being at a second gain value and the intermediate frequency adjustable gain module being at a third gain value.

[0016] As an alternative embodiment, in the second aspect of the embodiments of the present invention, adjusting the switch states of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module based on the comparison result through a gain switch controller includes:

[0017] When the comparison result is that the output power is greater than the second threshold, controlling the switch state to be the first switch state;

[0018] When the comparison result is that the output power is less than the first threshold, controlling the switch state to be the second switch state;

[0019] When the comparison result is that the output power is greater than the first threshold and less than the second threshold, controlling to keep the current switch state unchanged.

[0020] The third aspect of the embodiments of the present invention discloses a radio frequency receiving channel fixed gain dynamic adjustment device, including:

[0021] An initial state setting module: configured to control the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module to be in the initial switch state respectively through a gain switch controller to maintain the initial fixed gain; the initial fixed gain includes the radio frequency front-end adjustable gain module corresponding to the second gain value and the intermediate frequency adjustable gain module corresponding to the third gain value;

[0022] An output power detection module: configured to collect the output power and compare the output power with the set threshold to obtain a comparison result;

[0023] A gain data adjustment module: adjusting the switch states of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module based on the comparison result through a gain switch controller.

[0024] As an alternative embodiment, in the third aspect of the embodiments of the present invention, the set threshold includes a first threshold and a second threshold, and the first threshold is less than the second threshold; the comparison result includes that the output power is greater than the first threshold and less than the second threshold, the output power is less than the first threshold, and the output power is greater than the second threshold; the switch state includes an initial switch state, a first switch state, and a second switch state. The first switch state corresponds to the radio frequency front-end adjustable gain module having a first gain value and the intermediate frequency adjustable gain module having a fourth gain value, and the second switch state corresponds to the radio frequency front-end adjustable gain module having a second gain value and the intermediate frequency adjustable gain module having a third gain value.

[0025] As an alternative embodiment, in the third aspect of the embodiments of the present invention, adjusting the switch states of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module based on the comparison result by a gain switch controller includes:

[0026] When the comparison result is that the output power is greater than the second threshold, control the switch state to be the first switch state;

[0027] When the comparison result is that the output power is less than the first threshold, control the switch state to be the second switch state;

[0028] When the comparison result is that the output power is greater than the first threshold and less than the second threshold, control to keep the current switch state unchanged.

[0029] The fourth aspect of the embodiments of the present invention discloses an electronic device, including: a memory storing executable program code; a processor coupled to the memory; the processor invoking the executable program code stored in the memory for executing the radio frequency receiving channel fixed gain dynamic adjustment method disclosed in the second aspect of the embodiments of the present invention.

[0030] The fifth aspect of the embodiments of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the radio frequency receiving channel fixed gain dynamic adjustment method disclosed in the second aspect of the embodiments of the present invention.

[0031] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0032] In the embodiments of the present invention, an output power detector and a gain switch controller are added. The output power detector detects the power output by the analog intermediate frequency adjustable gain module, and compares the output power with a preset threshold. According to different output power levels, the gain values of the RF front-end adjustable gain module and the analog intermediate frequency adjustable gain module are adjusted respectively. When a large signal is input, the dynamic gain adjustment is placed on the analog intermediate frequency device with better linearity to optimize linearity, so that the system can withstand higher signal power. Although the noise figure deteriorates at this time, since it is in a large signal input state, the signal-to-noise ratio only needs to meet the demodulation threshold. When a small signal is input, due to the decrease of the input signal, the relatively low linearity index can also keep the channel in a linear amplification state. The dynamic gain adjustment is placed on the RF front-end with better noise performance to optimize the signal-to-noise ratio. The embodiments adjust the gain distribution of the RF front-end and the analog intermediate frequency by detecting the output power, and expand the dynamic range of the channel under the fixed gain adjustment inside the RF receiving channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 is a schematic diagram of the module structure of a fixed-gain dynamic adjustment system for an RF receiving channel disclosed in an embodiment of the present invention;

[0035] Figure 2 is a schematic flow diagram of a fixed-gain dynamic adjustment method for an RF receiving channel disclosed in an embodiment of the present invention;

[0036] Figure 3 is a schematic diagram of the result of a fixed-gain dynamic adjustment device for an RF receiving channel disclosed in an embodiment of the invention;

[0037] Figure 4 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] It should be noted that the terms "first", "second", "third", "fourth", etc. in the description and claims of the present invention are used to distinguish different objects, rather than to describe a specific order. The terms "include" and "have" in the embodiments of the present invention and any variations thereof are intended to cover non-exclusive inclusion. Exemplarily, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0040] The embodiments of the present invention disclose a fixed-gain dynamic adjustment system, method, device, electronic device and storage medium for a radio frequency receiving channel. In the embodiments, an output power detector and a gain switch controller are added. The output power detector detects the power output by the analog intermediate frequency adjustable gain module, and compares the output power with a preset threshold. According to different output power magnitudes, the gain values of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module are adjusted respectively. When a large signal is input, the dynamic gain adjustment is placed on the analog intermediate frequency device with better linearity to optimize the linearity, so that the system can withstand a higher signal power. Although the noise figure deteriorates at this time, since it is in a large-signal input state, the signal-to-noise ratio only needs to meet the coherent demodulation threshold. When a small signal is input, due to the decrease in the input signal, the relatively low linearity index at this time can also keep the channel in a linear amplification state. The dynamic gain adjustment is placed on the radio frequency front-end with better noise performance to optimize the signal-to-noise ratio. The embodiments adjust the gain allocation of the radio frequency front-end and the analog intermediate frequency by detecting the output power, and expand the dynamic range of the channel under the condition of realizing fixed-gain adjustment inside the radio frequency receiving channel.

[0041] Embodiment 1

[0042] Please refer to Figure 1 , Figure 1 , which shows a structural diagram of a fixed-gain dynamic adjustment system for a radio frequency receiving channel, including a radio frequency front-end adjustable gain module, an analog intermediate frequency adjustable gain module, an output power detector and a gain switch controller. The output end of the radio frequency front-end adjustable gain module is connected to the input end of the analog intermediate frequency adjustable gain module. The output end of the analog intermediate frequency adjustable gain module is connected to the input end of the output power detector. The output end of the output power detector is connected to the input end of the gain switch controller. The output control ends of the gain switch controller are respectively connected to the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module.

[0043] In the embodiment, the radio frequency front-end adjustable gain module performs preliminary amplification or attenuation processing on the externally input radio frequency signal. In this radio frequency front-end adjustable gain module in the embodiment, its gain is adjustable. Therefore, the gain can be dynamically adjusted according to the signal strength to avoid saturation caused by an overly strong signal or a decrease in signal-to-noise ratio caused by an overly weak signal. The analog intermediate frequency adjustable gain module further amplifies or attenuates the signal processed by the front-end adjustable gain module for further fine adjustment to ensure that the signal maintains an appropriate amplitude in subsequent processing. The output power detector is connected after the analog intermediate frequency adjustable gain module and is used to monitor the power of the output signal in real time. By detecting the power of the output signal, it can be determined whether the current gain is appropriate and whether adjustment is needed. The gain switch controller controls the gain settings of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module according to the signal provided by the output power detector. When the output power is too high or too low, the gain switch controller issues an instruction to adjust the gain of the module. By monitoring the power of the output signal in real time and dynamically adjusting the gain settings of the radio frequency front-end and analog intermediate frequency modules, precise control of the gain of the received signal is achieved.

[0044] Furthermore, the radio frequency front-end adjustable gain module includes a low-noise amplifier and a mixer connected to each other. The low-noise amplifier is connected to the external input, and the mixer is also connected to the analog intermediate frequency adjustable gain module. The analog intermediate frequency adjustable gain module includes an intermediate frequency low-pass filter and a programmable gain amplifier connected to each other. The intermediate frequency low-pass filter is also connected to the mixer, and the programmable gain amplifier is also connected to the output power detector.

[0045] The low-noise amplifier (LNA) is a key component of the radio frequency front end. It is located at the front stage of the radio frequency receiving channel and is used to preliminarily amplify the received weak radio frequency signal. The purpose of the LNA is to minimize the introduction of noise by providing sufficient gain to overcome the noise and losses of the subsequent circuits. The output of the LNA is directly connected to the mixer to provide a radio frequency signal with sufficient strength for the mixing process. The mixer receives the radio frequency signal from the LNA and a reference signal generated by a local oscillator (LO). By multiplying these two signals, the mixer down-converts the radio frequency signal to the intermediate frequency (IF) range for subsequent processing.

[0046] The intermediate frequency low-pass filter (LPF) is connected after the mixer and is used to filter out the unwanted high-frequency components generated during the mixing process. It only allows the intermediate frequency signal and the frequency components near it to pass through, thereby purifying the signal and improving the signal-to-noise ratio. The programmable gain amplifier (PGA) receives the intermediate frequency signal from the LPF and amplifies or attenuates it as needed. Its gain is adjustable and can be dynamically adjusted according to the actual setting or the signal strength. The output of the PGA is connected to the output power detector to monitor the power of the output signal in real time.

[0047] Further, the radio frequency front-end adjustable gain module includes a first gain value and a second gain value, and the first gain value is less than the second gain value. As an example, the first gain value is set to 20 dB and the second gain value is set to 28 dB. The analog intermediate frequency adjustable gain module includes a third gain value and a fourth gain value, and the third gain value is less than the fourth gain value. Exemplarily, the third gain value can be set to 0 dB and the fourth gain value can be set to 8 dB. That is, there are two gain levels available for both the radio frequency front-end and the analog intermediate frequency module. The control switch corresponding to the radio frequency front-end is k1. When k1 = 1, the radio frequency front-end is 28 dB; when k1 = 0, the radio frequency front-end is 20 dB. The control switch corresponding to the analog intermediate frequency module is k2. When k2 = 1, it is 8 dB; when k2 = 0, it corresponds to 0 dB. The dynamic adjustment gains of both the radio frequency front-end module and the analog intermediate frequency module are 8 dB. Since the system requires the analog receiving channel to maintain a fixed gain, according to the gain configurations of the radio frequency front-end module and the analog intermediate frequency module in this embodiment, the analog receiving channel is set to maintain a gain of 28 dB through these two schemes. The first scheme is that the radio frequency front-end module is configured with 28 dB and the analog intermediate frequency is configured with 0 dB. Another scheme is that the radio frequency front-end is configured with 20 dB and the analog intermediate frequency is configured with 8 dB. Among them, the radio frequency front-end NF is 5 dB and the IIP3 is 0 dBm, and the analog intermediate frequency NF is 35 dB and the IIP3 is 28 dBm.

[0048] When the system is reset or powered on by default, the gain switch controller sets k1 = 1 and k2 = 0. At this time, the RF front-end gain is 28 dB, the analog intermediate-frequency gain is 0 dB, and the output power detector starts to detect the output of the analog intermediate-frequency module and compares the detection result with the preset upper and lower thresholds. The comparison result is sent to the gain switch controller for control. When the output power is greater than the upper threshold, the gain switch controller sets k1 = 0 and k2 = 1. At this time, the RF front-end gain is configured as 20 dB and the analog intermediate-frequency is configured as 8 dB. According to the noise figure cascade calculation formula and the IIP3 cascade calculation formula, the overall NF of the analog channel at this time is 15.4 dB and the IIP3 is -0.68 dBm. When the output power is less than the lower threshold, the gain switch controller sets k1 = 1 and k2 = 0. At this time, the RF front-end gain is configured as 28 dB and the analog intermediate-frequency is configured as 0 dB. According to the noise figure cascade calculation formula and the IIP3 cascade calculation formula, the overall NF of the analog channel at this time is 9.13 dB and the IIP3 is -3.03 dBm. When the output power is greater than the lower threshold but less than the upper threshold, the gain switch controller keeps the previous switch state unchanged. That is, when the output power changes from greater than the upper threshold to between the upper and lower thresholds, the gain switch controller keeps the setting of k1 = 0 and k2 = 1 unchanged. Only when the output power changes to less than the lower threshold, the gain switch controller sets k1 = 1 and k2 = 0. Similarly, when the output power changes from less than the lower threshold to between the upper and lower thresholds, the gain switch controller keeps the setting of k1 = 1 and k2 = 0 unchanged. Only when the output power changes to greater than the upper threshold, the gain switch controller sets k1 = 0 and k2 = 1. When a large signal is input (the output power is greater than the upper threshold), the overall IIP3 index of the analog channel is increased from -3.03 dBm to -0.68 dBm, enabling the system to withstand a higher signal power. Although the noise figure deteriorates at this time, since it is in a large-signal input state, the signal-to-noise ratio only needs to meet the system demodulation threshold. When the output power is less than the lower threshold, an 8 dB dynamic adjustment gain is placed at the RF front-end, and the noise figure is reduced from 15.4 dB to 9.16 dB. It can be seen that the noise performance of the channel is optimized.

[0049] Embodiment 2

[0050] Please refer to Figure 2 , Figure 2It is a schematic flowchart of a method for dynamically adjusting the fixed gain of a radio frequency receiving channel disclosed in an embodiment of the present invention. Among them, the execution subject of the method described in the embodiment of the present invention is an execution subject composed of software or / and hardware. This execution subject can receive relevant information through wired or / and wireless means and can send certain instructions. Of course, it can also have certain processing functions and storage functions. This execution subject can control multiple devices, such as remote physical servers or cloud servers and related software, or it can be a local host or server and related software that performs relevant operations on devices placed somewhere. In some scenarios, it can also control multiple storage devices, and the storage devices can be placed in the same place or different places as the devices. As Figure 2 shown, this method for dynamically adjusting the fixed gain of a radio frequency receiving channel includes the following steps:

[0051] 201. Control the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module to be in the initial switch state respectively through the gain switch controller to maintain the initial fixed gain; the initial fixed gain includes that the radio frequency front-end adjustable gain module corresponds to the second gain value and the intermediate frequency adjustable gain module corresponds to the third gain value.

[0052] In a specific example, the first gain value is 20 dB, the second gain value is 28 dB, the third gain value is 0 dB, and the fourth gain value is 8 dB. When the system is reset or powered on by default, the gain switch controller sets k1 = 1 and k2 = 0. At this time, the radio frequency front-end gain is 28 dB, the analog intermediate frequency gain is 0 dB, and the output power detector starts to detect the output of the analog intermediate frequency module and compares the detection result with the preset upper and lower thresholds. The comparison result is sent to the gain switch controller for control. The initial fixed gain of the embodiment is also k1 = 1, k2 = 0, the radio frequency front-end gain is 28 dB, and the analog intermediate frequency gain is 0 dB.

[0053] 202. Collect the output power and compare the output power with the set threshold to obtain a comparison result.

[0054] In the embodiment, the set threshold includes a first threshold and a second threshold, and the first threshold is less than the second threshold; the comparison result includes that the output power is greater than the first threshold and less than the second threshold, the output power is less than the first threshold, and the output power is greater than the second threshold; the switch state includes the initial switch state, the first switch state, and the second switch state. The first switch state corresponds to the radio frequency front-end adjustable gain module being the first gain value and the intermediate frequency adjustable gain module being the fourth gain value, and the second switch state corresponds to the radio frequency front-end adjustable gain module being the second gain value and the intermediate frequency adjustable gain module being the third gain value.

[0055] 203. Adjust the switching states of the RF front-end adjustable gain module and the analog intermediate frequency adjustable gain module through the gain switch controller based on the comparison result.

[0056] In this step, specifically, when the comparison result is that the output power is greater than the second threshold, control the switching state to the first switching state; when the comparison result is that the output power is less than the first threshold, control the switching state to the second switching state; when the comparison result is that the output power is greater than the first threshold and less than the second threshold, control to keep the current switching state unchanged.

[0057] When the output power is greater than the upper threshold, the gain switch controller sets k1 = 0 and k2 = 1. At this time, the RF front-end gain is configured as 20 dB and the analog intermediate frequency is configured as 8 dB. According to the noise figure cascade calculation formula and the IIP3 cascade calculation formula, it can be obtained that the overall NF of the analog channel at this time is 15.4 dB and the IIP3 = -0.68 dBm. When the output power is less than the lower threshold, the gain switch controller sets k1 = 1 and k2 = 0. At this time, the RF front-end gain is configured as 28 dB and the analog intermediate frequency is configured as 0 dB. According to the noise figure cascade calculation formula and the IIP3 cascade calculation formula, it can be obtained that the overall NF of the analog channel at this time is 9.13 dB and the IIP3 = -3.03 dBm. When the output power is greater than the lower threshold but less than the upper threshold, the gain switch controller keeps the previous switching state unchanged. That is, when the output power changes from greater than the upper threshold to between the upper threshold and the lower threshold, the gain switch controller keeps the settings of k1 = 0 and k2 = 1 unchanged. Only when the output power changes to less than the lower threshold, the gain switch controller sets k1 = 1 and k2 = 0. Similarly, when the output power changes from less than the lower threshold to between the upper threshold and the lower threshold, the gain switch controller keeps the settings of k1 = 1 and k2 = 0 unchanged. Only when the output power changes to greater than the upper threshold, the gain switch controller sets k1 = 0 and k2 = 1. When a large signal is input (output power is greater than the upper threshold), the overall IIP3 index of the analog channel is increased from -3.03 dBm to -0.68 dBm, enabling the system to withstand a higher signal power. Although the noise figure deteriorates at this time, since it is in a large signal input state, the signal-to-noise ratio only needs to meet the system demodulation threshold. When the output power is less than the lower threshold, the 8 dB dynamic adjustment gain is placed at the RF front-end, and the noise figure is reduced from 15.4 dB to 9.16 dB. It can be seen that the noise performance of the channel is optimized.

[0058] Embodiment III

[0059] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of a fixed gain dynamic adjustment device for an RF receiving channel disclosed in an embodiment of the present invention. As shown in Figure 3As shown in the figure, the fixed-gain dynamic adjustment device for the radio frequency receiving channel may include: an initial state setting module 301, an output power detection module 302, and a gain data adjustment module 303. Among them, the initial state setting module 301 is configured to control the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module to be in the initial switch states respectively through a gain switch controller, so as to maintain the initial fixed gain; the initial fixed gain includes that the radio frequency front-end adjustable gain module corresponds to a second gain value and the intermediate frequency adjustable gain module corresponds to a third gain value; the output power detection module 302 is configured to collect the output power and compare the output power with a set threshold to obtain a comparison result; the gain data adjustment module 303 is configured to adjust the switch states of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module based on the comparison result through the gain switch controller.

[0060] In the embodiment, the gain data adjustment module 303 includes a first comparison sub-module, a second comparison sub-module, and a third comparison sub-module. Among them, the first comparison sub-module is configured to control the switch state to be a first switch state when the comparison result is that the output power is greater than a second threshold; the second comparison sub-module is configured to control the switch state to be a second switch state when the comparison result is that the output power is less than a first threshold; the third comparison sub-module is configured to control to keep the current switch state unchanged when the comparison result is that the output power is greater than the first threshold and less than the second threshold.

[0061] Embodiment 4

[0062] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of an electronic device disclosed in an embodiment of the present invention. The electronic device may be a computer, a server, etc. Of course, in certain cases, it may also be an intelligent device such as a mobile phone, a tablet computer, and a monitoring terminal, as well as an image acquisition device with a processing function. As Figure 4 shown, the electronic device may include:

[0063] a memory 401 storing executable program code;

[0064] a processor 402 coupled to the memory 401;

[0065] Among them, the processor 402 calls the executable program code stored in the memory 401 and executes some or all of the steps in the radio frequency receiving channel fixed-gain dynamic adjustment method in Embodiment 2.

[0066] An embodiment of the present invention discloses a computer-readable storage medium, which stores a computer program. Among them, the computer program enables a computer to execute some or all of the steps in the radio frequency receiving channel fixed-gain dynamic adjustment method in Embodiment 2.

[0067] An embodiment of the present invention also discloses a computer program product. When the computer program product runs on a computer, the computer is caused to execute some or all of the steps in the fixed-gain dynamic adjustment method of the radio frequency receiving channel in the second embodiment.

[0068] An embodiment of the present invention also discloses an application release platform. The application release platform is used to release a computer program product. When the computer program product runs on a computer, the computer is caused to execute some or all of the steps in the fixed-gain dynamic adjustment method of the radio frequency receiving channel in the second embodiment.

[0069] In various embodiments of the present invention, it should be understood that the magnitude of the sequence numbers of the various processes does not necessarily mean the order of execution. The order of execution of the various processes should be determined according to their functions and internal logics, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0070] The unit described as a separate component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0071] In addition, in each embodiment of the present invention, the various functional units may be integrated in a processing unit, may also be physically present separately for each unit, or two or more units may be integrated in one unit. The integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0072] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-accessible memory. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a memory and includes several requests for causing a computer device (which may be a personal computer, a server, or a network device, etc., specifically, the processor in the computer device) to execute some or all of the steps of the methods described in the various embodiments of the present invention.

[0073] In the embodiments provided by the present invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0074] Those of ordinary skill in the art can understand that some or all of the steps in the various methods of the embodiments can be completed by instructing relevant hardware through a program, and this program can be stored in a computer-readable storage medium. The storage medium includes read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc memories, magnetic disc memories, magnetic tape memories, or any other medium that can be used to carry or store data and is computer-readable.

[0075] The above has introduced in detail the method, device, electronic device and storage medium for fixed-gain dynamic adjustment of a radio frequency receiving channel disclosed in the embodiments of the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A fixed-gain dynamic adjustment system for a radio frequency receiving channel, characterized in that, Comprising: A radio frequency front-end adjustable gain module, an analog intermediate frequency adjustable gain module, an output power detector, and a gain switch controller. The radio frequency front-end adjustable gain module is connected to an external input. The output end of the radio frequency front-end adjustable gain module is connected to the input end of the analog intermediate frequency adjustable gain module. The output end of the analog intermediate frequency adjustable gain module is connected to the input end of the output power detector. The output end of the output power detector is connected to the input end of the gain switch controller. The output control end of the gain switch controller is respectively connected to the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module; The radio frequency front-end adjustable gain module includes a first gain value and a second gain value, and the first gain value is less than the second gain value; the analog intermediate frequency adjustable gain module includes a third gain value and a fourth gain value, and the third gain value is less than the fourth gain value; wherein the sum of the first gain value and the fourth gain value is equal to the sum of the second gain value and the third gain value; The output power detector is used to collect the output power and compare the output power with a set threshold to obtain a comparison result; the set threshold includes a first threshold and a second threshold, and the first threshold is less than the second threshold; the comparison result includes that the output power is greater than the first threshold and less than the second threshold, the output power is less than the first threshold, and the output power is greater than the second threshold; The gain switch controller adjusts the switch states of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module based on the comparison result; the switch states include an initial switch state, a first switch state, and a second switch state. The first switch state corresponds to the radio frequency front-end adjustable gain module being the first gain value and the intermediate frequency adjustable gain module being the fourth gain value. The second switch state corresponds to the radio frequency front-end adjustable gain module being the second gain value and the intermediate frequency adjustable gain module being the third gain value; when the comparison result is that the output power is greater than the second threshold, the switch state is controlled to be the first switch state; when the comparison result is that the output power is less than the first threshold, the switch state is controlled to be the second switch state; when the comparison result is that the output power is greater than the first threshold and less than the second threshold, the current switch state is controlled to remain unchanged.

2. The fixed-gain dynamic adjustment system for a radio frequency receiving channel according to claim 1, wherein The radio frequency front-end adjustable gain module includes a low-noise amplifier and a mixer connected to each other. The low-noise amplifier is connected to an external input, and the mixer is also connected to the analog intermediate frequency adjustable gain module.

3. The fixed-gain dynamic adjustment system for a radio frequency receiving channel according to claim 2, wherein The analog intermediate frequency adjustable gain module includes an intermediate frequency low-pass filter and a programmable gain amplifier connected to each other. The intermediate frequency low-pass filter is also connected to the mixer, and the programmable gain amplifier is also connected to the output power detector.

4. A method for dynamically adjusting the fixed gain of a radio frequency receiving channel, characterized in that, Comprising: Controlling the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module to be in the initial switch state respectively through the gain switch controller to maintain an initial fixed gain; the initial fixed gain includes that the radio frequency front-end adjustable gain module corresponds to the second gain value and the intermediate frequency adjustable gain module corresponds to the third gain value; Collect the output power and compare the output power with a set threshold to obtain a comparison result; the set threshold includes a first threshold and a second threshold, and the first threshold is less than the second threshold; the comparison result includes that the output power is greater than the first threshold and less than the second threshold, the output power is less than the first threshold, and the output power is greater than the second threshold; Based on the comparison result, adjust the switch states of the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module through a gain switch controller; the switch states include an initial switch state, a first switch state, and a second switch state. The first switch state corresponds to the radio frequency front-end adjustable gain module being at a first gain value and the intermediate frequency adjustable gain module being at a fourth gain value. The second switch state corresponds to the radio frequency front-end adjustable gain module being at a second gain value and the intermediate frequency adjustable gain module being at a third gain value; wherein the sum of the first gain value and the fourth gain value is equal to the sum of the second gain value and the third gain value; the first gain value is less than the second gain value, and the third gain value is less than the fourth gain value; when the comparison result is that the output power is greater than the second threshold, control the switch state to be the first switch state; when the comparison result is that the output power is less than the first threshold, control the switch state to be the second switch state; when the comparison result is that the output power is greater than the first threshold and less than the second threshold, control to keep the current switch state unchanged.

5. A fixed-gain dynamic adjustment device for a radio frequency receiving channel, characterized in that, Comprising: Initial state setting module: used to control the radio frequency front-end adjustable gain module and the analog intermediate frequency adjustable gain module to be in the initial switch state respectively through a gain switch controller to maintain an initial fixed gain; the initial fixed gain includes that the radio frequency front-end adjustable gain module corresponds to the second gain value and the intermediate frequency adjustable gain module corresponds to the third gain value; Output power detection module: used to collect the output power and compare the output power with a set threshold to obtain a comparison result; the set threshold includes a first threshold and a second threshold, and the first threshold is less than the second threshold; the comparison result includes that the output power is greater than the first threshold and less than the second threshold, the output power is less than the first threshold, and the output power is greater than the second threshold; Gain data adjustment module: Based on the comparison result, adjust the switching states of the RF front-end adjustable gain module and the analog intermediate frequency adjustable gain module through the gain switch controller; the switching states include an initial switching state, a first switching state, and a second switching state. The first switching state corresponds to the RF front-end adjustable gain module having a first gain value and the intermediate frequency adjustable gain module having a fourth gain value. The second switching state corresponds to the RF front-end adjustable gain module having a second gain value and the intermediate frequency adjustable gain module having a third gain value. The sum of the first gain value and the fourth gain value is equal to the sum of the second gain value and the third gain value. The first gain value is less than the second gain value, and the third gain value is less than the fourth gain value. When the comparison result is that the output power is greater than the second threshold, control the switching state to be the first switching state. When the comparison result is that the output power is less than the first threshold, control the switching state to be the second switching state. When the comparison result is that the output power is greater than the first threshold and less than the second threshold, control to keep the current switching state unchanged.

6. An electronic device, characterized in that, Comprising: A memory storing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory for executing the fixed-gain dynamic adjustment method of the RF receiving channel according to claim 4.

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