Ultra-wideband link gain adaptive regulation and control system and method
By designing an adaptive gain equalization system in the ultra-wideband receiver link, the problem of gain fluctuations between different frequency bands and radio frequency channels is solved, and a flat gain response and dynamic range improvement is achieved.
Patent Information
- Application Number
- CN202510241227.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-05-30
AI Technical Summary
The existing ultra-wideband receiver links have gain fluctuations in different frequency bands and radio frequency channels, resulting in limited dynamic range of the system and difficulty in achieving flat gain response.
Design an ultra-wideband link gain adaptive control system, including RF front-end network, ultra-wideband correction source, switch selection network, frequency mixer, adaptive gain equalization module and intermediate frequency filter. The intermediate frequency signal power is detected through the detection feedback circuit, the control processing module compares the correction signal power with the intermediate frequency signal power, calculates the required gain compensation amount, and realizes gain equalization control at different frequency points through the adaptive gain equalization circuit.
Gain equalization of the ultra-wideband receiver link in different frequency bands and RF channels is achieved, which improves the dynamic range of the receiver, reduces gain fluctuations, and improves the dynamic range and action distance of the system.
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Figure CN120074566A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of microwave technology, and particularly relates to an ultra-wideband link gain adaptive regulation system and method. Background Art
[0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art.
[0003] According to Shannon's theorem, the channel capacity is proportional to the signal transmission bandwidth. More and more receivers adopt ultra-wideband working modes to improve system performances such as rate and resolution, and are widely applied in different scenarios such as communication and radar. On the one hand, in the link of an ultra-wideband receiver, multi-stage amplifiers are generally adopted, and the gain response of the amplifier in the broadband range usually fluctuates greatly, resulting in large fluctuations in the final gain of the system, and further affecting indicators such as the system dynamic range. On the other hand, in a multi-channel receiving system, there are inconsistencies among different radio frequency channels, and there are also gain fluctuations when different channels are selected, further affecting the dynamic range of the system. To improve the dynamic range of the ultra-wideband receiver system and improve the system operating distance, it is usually required that the receiver link has a relatively flat gain response in the ultra-wideband range. Existing methods mainly adopt adding fixed gain equalization devices after the intermediate frequency signal, such as coaxial gain equalization and microstrip gain equalization, and realize a relatively flat gain response of the entire link by reversely compensating the gain response within the broadband of the receiver link.
[0004] As Figure 2 shown in the schematic diagram of a conventional ultra-wideband receiving link topology, signals received by different antennas enter multiple radio frequency front-end networks, are amplified, attenuated, and filtered, and then enter the subsequent switch selection network. Finally, the radio frequency signal (RF) is mixed with the local oscillator signal (LO) by a mixer to generate an intermediate frequency signal (IF). To achieve the gain equalization of the entire link, an equalization device with a fixed gain equalization amount is added after the mixer. On the one hand, the required gain equalization amount needs to be finely adjusted according to the actual link after processing, and may not be able to completely compensate for the gain fluctuations in the ultra-wideband range, and the equalization amount cannot be adjusted anymore after being fixed. On the other hand, due to the fixed equalization amount, when different radio frequency channels are selected, the equalization amount cannot be further adjusted, that is, the problem of gain fluctuations of different radio frequency channels cannot be improved, resulting in obvious ultra-wideband gain fluctuations and limited dynamic range of the system link. Summary of the Invention
[0005] The purpose of the present invention is to provide an ultra-wideband link gain adaptive regulation system and method for solving the problems existing in the prior art, which can realize the gain equalization of different frequency bands and different radio frequency channels of the ultra-wideband receiver link, and further improve the dynamic range of the receiver.
[0006] The technical solution of the present invention is as follows:
[0007] An ultra-wideband link gain adaptive regulation system, comprising: a radio frequency front-end network, an ultra-wideband calibration source, a switch selection network, a mixer, an adaptive gain equalization module, and an intermediate frequency filter; the adaptive gain equalization module includes: a detection feedback circuit, a control processing module, and an adaptive gain equalization circuit;
[0008] The ultra-wideband calibration source is responsible for outputting calibration signals at different frequency points under a broadband with a standard power;
[0009] The detection feedback circuit is connected to the intermediate frequency filter for detecting the power of the intermediate frequency signal;
[0010] The control processing module obtains the gain response at different frequency points under the link of the currently selected radio frequency channel by comparing the power of the calibration signal with the power of the intermediate frequency signal, obtains the required gain compensation amount, and issues a control signal;
[0011] The adaptive gain equalization circuit can receive the control signal, realize the regulation of the gain equalization amount at different frequency points, and finally realize a flat gain response within the broadband frequencies of different channels of the link.
[0012] Further, the radio frequency front-end network has a function of switching the input of radio frequency signals, and can select and connect to the antenna end to receive radio frequency signals or the calibration signals output by the ultra-wideband calibration source.
[0013] Further, the switch selection network is connected to the radio frequency front-end network to select a radio frequency channel and output a radio frequency signal.
[0014] Further, the mixer can mix the radio frequency signal output by the switch selection network with the local oscillator signal to obtain an intermediate frequency signal.
[0015] Further, the intermediate frequency signal enters the detection feedback circuit through a branch coupling method to detect the power of the coupled signal, and reports it to the control processing module.
[0016] Further, the adaptive gain equalization circuit is composed of a plurality of adjustable equalization stubs.
[0017] Further, the adjustable equalization stub includes: an inductor and an adjustable capacitor, and by adjusting the adjustable capacitor, different equalization state responses at different frequencies are realized.
[0018] The present invention also proposes an ultra-wideband link gain adaptive regulation method, based on the above-mentioned ultra-wideband link gain adaptive regulation system, comprising:
[0019] Step S1: Output calibration signals at different frequency points under a broadband with a standard power from the ultra-wideband calibration source to the radio frequency front-end network;
[0020] Step S2: Select and enable the target RF channel through the switch selection network, input the RF signal into the mixer, and mix it with the local oscillator signal to generate an intermediate frequency signal;
[0021] Step S3: Detect the power of the intermediate frequency signal through the detection feedback circuit, and report the detected power of the intermediate frequency signal to the control processing module;
[0022] Step S4: The control processing module obtains the gain response at different frequency points under the current selected RF channel of the link by comparing the power of the calibration signal with the power of the intermediate frequency signal, obtains the required gain compensation amount, and issues a control signal;
[0023] Step S5: The adaptive gain equalization circuit receives the control signal, realizes the regulation of the gain equalization amount at different frequency points, and finally realizes the flat gain response within the broadband frequency of different channels of the link.
[0024] Further, the intermediate frequency signal enters the detection feedback circuit through the branch coupling method to detect the power of the coupled signal, and reports it to the control processing module.
[0025] Further, step S5 includes:
[0026] Adjust the value of the adjustable capacitor to realize different equalization state responses at different frequencies.
[0027] Compared with the existing technology, the beneficial effects of the present invention are:
[0028] 1. In the ultra-wideband link of the present invention, by adding an adaptive gain equalization module, dynamic adaptive regulation of the gain equalization amount can be realized when the receiver is ultra-wideband and different RF channels are selected and enabled, and finally flat output of the link gain is realized.
[0029] 2. The adaptive gain equalization module proposed by the present invention is self-closed-loop at the RF link level, without additional digital acquisition and processing overhead. It is expected that the gain fluctuation within the broadband of the receiver link can be improved by more than 6.5 dB, and the dynamic range of the receiver can be increased by more than 6.5 dB. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 It is a topology block diagram of the ultra-wideband link gain adaptive regulation method of the present invention;
[0031] Figure 2 It is a schematic diagram of an ultra-wideband receiving link based on a fixed gain equalization device;
[0032] Figure 3 It is an implementation example diagram of the ultra-wideband link gain adaptive regulation method of the present invention;
[0033] Figure 4 It is a schematic diagram of the functional composition of the gain adaptive equalization circuit of the present invention;
[0034] Figure 5 Schematic diagrams of different equalization states of the gain adaptive equalization circuit of the present invention;
[0035] Figure 6 Graph of different channel gain fluctuations before gain equalization of the ultra-wideband link of the present invention;
[0036] Figure 7 Graph of different channel gain fluctuations after adaptive equalization of the ultra-wideband link of the present invention. Detailed implementation manners
[0037] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.
[0038] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.
[0039] Embodiment 1
[0040] Please refer to Figure 1 and Figure 4 An ultra-wideband link gain adaptive regulation system, comprising: a radio frequency front-end network, an ultra-wideband calibration source, a switch selection network, a mixer, an adaptive gain equalization module, and an intermediate frequency filter;
[0041] The adaptive gain equalization module includes: a detection feedback circuit, a control processing module (MCU), and an adaptive gain equalization circuit;
[0042] The ultra-wideband calibration source is responsible for outputting calibration signals at different frequency points under a broadband of standard power; that is, the calibration signals at different frequency points under a broadband of standard power output by the ultra-wideband calibration source enter different radio frequency front-end networks;
[0043] The detection feedback circuit is connected to the intermediate frequency filter and is used to detect the power of the intermediate frequency signal;
[0044] The control processing module obtains the gain responses at different frequency points under the current selected RF channel of the link by comparing the power of the calibration signal with the power of the intermediate frequency signal, obtains the required gain compensation amount, and issues a control signal.
[0045] The adaptive gain equalization circuit can receive the control signal, realize the regulation of the gain equalization amount at different frequency points, and finally realize the flat gain response within the broadband frequency of different channels of the link.
[0046] In this embodiment, specifically, the RF front-end network has the function of switching the RF signal input, and can select the antenna end to receive the RF signal or the ultra-wideband calibration source to output the calibration signal.
[0047] In this embodiment, specifically, the switch selection network is connected to the RF front-end network to select the RF channel and output the RF signal; that is, the switch selection network can select different RF channels to output the final RF signal.
[0048] In this embodiment, specifically, the mixer can mix the RF signal output by the switch selection network with the local oscillator signal to obtain the intermediate frequency signal; that is, the RF signal enters the mixer and is mixed with the local oscillator signal to obtain the intermediate frequency signal.
[0049] In this embodiment, specifically, the intermediate frequency signal enters the detection feedback circuit through the branch coupling method to detect the power of the coupled signal, and reports it to the control processing module.
[0050] In this embodiment, specifically, the adaptive gain equalization circuit is composed of a plurality of adjustable equalization sections.
[0051] In this embodiment, specifically, the adjustable equalization section includes: an inductor and an adjustable capacitor. By adjusting the adjustable capacitor, different equalization state responses at different frequencies can be realized.
[0052] This embodiment also proposes an ultra-wideband link gain adaptive regulation method, based on the above ultra-wideband link gain adaptive regulation system, including:
[0053] Step S1: Output calibration signals at different frequency points under a broadband with a standard power from the ultra-wideband calibration source to the RF front-end network;
[0054] Step S2: Select the target RF channel through the switch selection network, input the RF signal into the mixer, and mix it with the local oscillator signal to generate an intermediate frequency signal;
[0055] Step S3: Detect the power of the intermediate frequency signal through the detection feedback circuit, and report the detected power of the intermediate frequency signal to the control processing module;
[0056] Step S4: The control processing module obtains the gain responses at different frequency points under the current selected RF channel of the link by comparing the power of the calibration signal with the power of the intermediate frequency signal, obtains the required gain compensation amount, and issues a control signal.
[0057] Step S5: The adaptive gain equalization circuit receives the control signal, realizes the regulation of the gain equalization amount at different frequency points, and finally realizes the flat gain response within the broadband frequency of different channels of the link.
[0058] In this embodiment, specifically, the intermediate frequency signal enters the detection feedback circuit through the branch coupling method to detect the power of the coupled signal, and reports it to the control processing module.
[0059] In this embodiment, specifically, step S5 includes:
[0060] Adjust the value of the adjustable capacitor, and then realize different equalization state responses at different frequencies.
[0061] Embodiment 2
[0062] As Figure 3 shown, the link of an ultra-wideband receiver consists of a RF front-end network with 4 RF channels, an ultra-wideband calibration source, a switch selection network, a mixer, a detection feedback circuit, a control processing module (MCU), an adaptive gain equalization circuit, and an intermediate frequency filter; the RF front-end network has the function of switching RF signal input, that is, it can select to receive RF signals from the antenna end or calibration signals output by the ultra-wideband calibration source.
[0063] As a preferred method, as Figure 4 shown, a schematic diagram of the functional composition of a typical adaptive gain equalization circuit is given, which consists of adjustable equalization branches composed of multiple inductors and adjustable capacitors. By adjusting the adjustable capacitor, different equalization state responses at different frequencies are realized.
[0064] Figure 5 The gain responses of the adaptive gain equalization circuit in different gain equalization states within the 2 - 6 GHz broadband signal are given, and it can be seen that the gain equalization link can realize the dynamic adjustment of the gain.
[0065] As a preferred method, Figure 3 in the ultra-wideband link shown, the specific implementation process of its gain adaptive regulation is as follows:
[0066] First, by enabling the ultra-wideband calibration source to output calibration signals at different frequency points under the standard power into the four RF front-end networks of the receiver, the switch selection network selects one of the RF channels from the four RF front-end networks to output the final RF signal into the mixer, where it is mixed with the local oscillator signal to obtain an intermediate frequency signal; the intermediate frequency signal output by the link enters the detection feedback circuit through the branch coupling method to detect the power of the coupled signal and report it to the control processing module (MCU);
[0067] Further, by comparing the power of the standard power calibration source signal with the detected power, the gain response at different frequency points under the current selected RF channel of the link is obtained, and the required gain compensation amount is obtained; then, the adaptive gain equalization circuit receives the control signal issued by the control processing module (MCU) to achieve the regulation of the gain equalization amount at different frequency points; finally, a flat gain response within the broadband frequency of different channels of the link is achieved.
[0068] As Figure 6 shown, it shows Figure 3 In the schematic diagram of the ultra-wideband link shown, the link gain data without gain equalization processing under the four RF channels. It can be seen from the figure that the gain fluctuation within the broadband range under the four RF channels is nearly 10 dB, and at the same time, the gain fluctuation trends between different RF channels are inconsistent, so a fixed equalization device cannot be used for processing; Figure 7 It shows the schematic diagram of the overall link gain after adaptive gain control of calibration by switching channels; from Figure 7 it can be seen that for the same RF channel, its maximum gain fluctuation within the broadband range is about 3 dB. At the same time, the gain fluctuation between different RF channels is also significantly improved, with an improvement of more than 6.5 dB compared to that before adaptive equalization. Furthermore, the dynamic range of the entire receiver is improved by more than 6.5 dB.
[0069] The above-described embodiments only represent the specific implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the protection scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the technical solution of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application.
[0070] This background technology section is provided to generally present the context of the present invention. The work of the currently named inventors, to the extent described in this background technology section, and aspects that are not prior art at the time of filing this application are neither expressly nor implicitly admitted to be prior art of the present invention.
Claims
1. An ultra-wideband link gain adaptive control system, characterized in that: include: RF front-end network, ultra-wideband correction source, switch selection network, mixer, adaptive gain equalization module, intermediate frequency filter; The adaptive gain equalization module comprises: a detection feedback circuit, a control processing module and an adaptive gain equalization circuit; The ultra-wideband correction source is responsible for outputting correction signals at different frequencies in a broadband with standard power; The detection feedback circuit is connected to the intermediate frequency filter and is used to detect the power of the intermediate frequency signal; The control processing module obtains the gain response at different frequency points under the link under the current selected radio frequency channel by comparing the correction signal power with the intermediate frequency signal power, obtains the required gain compensation amount, and sends a control signal; The adaptive gain equalization circuit can receive a control signal to achieve regulation of the gain equalization amount at different frequency points, and ultimately achieve a flat gain response within the broadband frequency of different channels of the link.
2. The ultra-wideband link gain adaptive control system according to claim 1, characterized in that: The RF front-end network has the function of switching RF signal input, and can select the antenna end to receive the RF signal or the ultra-wideband correction source to output the correction signal.
3. The ultra-wideband link gain adaptive control system according to claim 2, characterized in that: The switch selection network is connected to the RF front-end network to select the RF channel and output the RF signal.
4. The ultra-wideband link gain adaptive control system according to claim 3, characterized in that: The mixer can mix the radio frequency signal output by the switch selection network with the local oscillator signal to obtain an intermediate frequency signal.
5. The ultra-wideband link gain adaptive control system according to claim 4, characterized in that: The intermediate frequency signal enters the detection feedback circuit through a branch coupling method to perform power detection on the coupled signal and report it to the control processing module.
6. The ultra-wideband link gain adaptive control system according to claim 1, characterized in that: The adaptive gain equalization circuit is composed of a plurality of adjustable equalization branches.
7. The ultra-wideband link gain adaptive control system according to claim 6, characterized in that: The adjustable balancing branch includes an inductor and an adjustable capacitor, and different balancing state responses at different frequencies are achieved by adjusting the adjustable capacitor.
8. A method for adaptively controlling gain of an ultra-wideband link, characterized in that: An ultra-wideband link gain adaptive control system according to any one of claims 1 to 7, comprising: Step S1: Outputting calibration signals at different frequencies at broadband with standard power to the RF front-end network through an ultra-wideband calibration source; Step S2: Select the target RF channel through the switch selection network, input the RF signal into the mixer, and mix it with the local oscillator signal to generate an intermediate frequency signal; Step S3: Perform power detection on the intermediate frequency signal through the detection feedback circuit, and report the detected intermediate frequency signal power to the control processing module; Step S4: the control processing module obtains the gain response at different frequency points of the link under the currently selected RF channel by comparing the correction signal power with the intermediate frequency signal power, obtains the required gain compensation amount, and sends a control signal; Step S5: The adaptive gain equalization circuit receives the control signal to adjust the gain equalization amount at different frequency points, and finally achieves a flat gain response within the broadband frequency of different channels of the link.
9. The method for adaptively controlling gain of an ultra-wideband link according to claim 8, characterized in that: The intermediate frequency signal enters the detection feedback circuit through a branch coupling method to perform power detection on the coupled signal and report it to the control processing module.
10. The method for adaptively controlling gain of an ultra-wideband link according to claim 8, characterized in that: The step S5 comprises: By adjusting the adjustable capacitance value, different equilibrium state responses at different frequencies can be achieved.