Broadband fine-stepping amplitude-adjustable equalization system

Abstract

The invention discloses a broadband fine-stepping amplitude-adjustable equalization system, which comprises an input end, an output end, an amplitude-adjustable unit, a control unit and a feedback network, an external input broadband signal is input into the amplitude equalization system through the input end and then divided into two groups of signals, one group of signals is output by the output end through the adjustable amplitude unit, and the other group of signals is input into the control unit through the feedback network. The output end inputs the amplitude of the output signal into the control unit through the feedback network; and the control unit inputs the DAC voltage into the adjustable equalization unit. According to the invention, high-precision and fine-stepping amplitude adjustment can be realized in a broadband range, and amplitude distortion of signals in a transmission process can be effectively compensated. The antenna is simple in structure, easy to integrate and suitable for various broadband communication systems; the signal transmission quality is improved, and the overall performance of a communication system is improved.

Description

Technical Field

[0001] The invention relates to the field of communication technology, in particular to a broadband fine-step adjustable amplitude equalization system. Background Art

[0002] In modern communication systems, signals are affected by many factors during transmission, resulting in amplitude and phase distortion. To solve this problem, an equalization system needs to be added at the receiving or transmitting end to compensate for the influence of the channel. However, the existing broadband adjustable equalization system has certain limitations in step adjustment accuracy, which makes it difficult to meet the needs of high-speed and high-precision communication systems. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a broadband fine-step adjustable amplitude equalization system, including an input end, an output end, an adjustable amplitude unit, a control unit, and a feedback network; an external input broadband signal is input into the amplitude equalization system through the input end and is divided into two groups of signals, one group of signals is output from the output end through the adjustable amplitude unit, and the other group is input into the control unit through the feedback network; the output end inputs the output signal amplitude into the control unit via the feedback network; the control unit inputs the DAC voltage into the adjustable equalization unit.

[0004] Furthermore, the input end specifically includes: a signal coupler, an amplifier, and a voltage-controlled attenuator; the external input signal is divided into two groups of signals via the signal coupler, one group is transmitted to the feedback network, and the other group is input into the voltage-controlled attenuator after passing through the amplifier. The voltage-controlled attenuator receives the control ADC signal and the amplified signal and transmits them to the adjustable equalization unit after processing.

[0005] Furthermore, the adjustable amplitude unit specifically includes a plurality of groups of amplitude adjustment units, and the plurality of groups of amplitude adjustment units are connected in parallel, one end of which is connected to the input end, and the other end is grounded.

[0006] Furthermore, the amplitude adjustment unit specifically includes: a variable resistance diode, an inductor, and a capacitor; the input signal at the input end is grounded after passing through the variable resistance diode and the inductor, and the capacitor and the inductor are connected in parallel.

[0007] Furthermore, the control unit specifically uses the DAC output voltage to perform fine step adjustment of the signal and the signal amplitude, and specifically includes: a digital-to-analog converter, an ACU, and multiple analog-to-digital converters; the multiple analog-to-digital converters are specifically two; the feedback network input signal is transmitted to the two analog-to-digital converters respectively through the digital-to-analog converter and then through the ACU, and then respectively transmitted to the voltage-controlled attenuator and the adjustable equalization unit.

[0008] Furthermore, the specific calculation formula for the amplitude fine step adjustment is: delta A = A max / 2M ; In the formula, delta A Indicates the minimum step of amplitude adjustment; A max Indicates the maximum adjustable range of the equalization system; M indicates the number of bits of adjustment accuracy; the performance of the equalization system is evaluated by the mean square error MSE: MSE = (1 / N) * sum n=1 N |e(n)| 2 ; Where N is the number of observed samples; e(n) = d(n) - |w(n) T * x(n)| represents the error signal at the (n)th iteration; d(n) represents the expected signal; w(n) T * x(n) represents the output of the balanced system.

[0009] Furthermore, the output end specifically includes impedance matching and output signal coupling; the impedance matching specifically adopts a multi-section λ / 4 transformation line or a T-type matching network.

[0010] Furthermore, after the feedback network receives the signals at the output end and the input end and performs signal detection, the input signal power and amplitude, and the output signal power and amplitude are transmitted to the control unit.

[0011] The present invention provides a broadband fine-step adjustable amplitude equalization system, which has the following beneficial effects: The present invention can achieve high-precision, fine-step amplitude adjustment within a wide frequency band, effectively compensating for amplitude distortion of signals during transmission. It has a simple structure, is easy to integrate, and is suitable for a variety of broadband communication systems; it improves signal transmission quality and the overall performance of the communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0013] Figure 1 A schematic diagram of the system structure provided by the present invention; Figure 2 The input circuit schematic diagram provided by the present invention; Figure 3 The schematic diagram of the adjustable balancing network provided by the present invention; Figure 4 The output circuit schematic diagram provided by the present invention; Figure 5This is a schematic diagram of the control unit provided by the present invention. DETAILED DESCRIPTION

[0014] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0015] The following is a detailed description of the implementation method of the present invention in conjunction with the accompanying drawings. Only some embodiments are described, not all embodiments. For the purpose of clarity, representations and descriptions that are not related to the present invention are omitted in the drawings and descriptions.

[0016] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below. Obviously, the implementation cases described are part of the embodiments of the present invention, not all of the embodiments, and cannot be understood as limiting the scope of the implementation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0017] like Figure 1 As shown, the present invention provides a broadband fine-step adjustable amplitude equalization system, including an input end, an output end, an adjustable amplitude unit, a control unit, and a feedback network; an external input broadband signal is input into the amplitude equalization system through the input end and is divided into two groups of signals, one group of signals is output from the output end through the adjustable amplitude unit, and the other group is input into the control unit through the feedback network; the output end inputs the output signal amplitude into the control unit via the feedback network; the control unit inputs the DAC voltage into the adjustable equalization unit.

[0018] Input terminal, such as Figure 2 As shown, it specifically includes: a signal coupler, an amplifier, and a voltage-controlled attenuator; the external input signal is divided into two groups of signals through the signal coupler, one of which is transmitted to the feedback network, and the other group is input into the voltage-controlled attenuator after passing through the amplifier. The voltage-controlled attenuator receives the control ADC signal and the amplified signal and transmits it to the adjustable equalization unit after processing. Receive broadband signals, amplify and condition the received signals. The circuit principle mainly consists of coupling, amplification, and voltage-controlled attenuation. The signal is sent to the feedback network through coupling to monitor the size of the broadband signal; the system noise is reduced through amplification, and the impact of the introduction of the equalization system on the GT value of the entire receiving link is reduced; finally, the voltage-controlled attenuation pre-processes the signal to compensate for the inconsistent amplitude changes caused by the back-end equalization.

[0019] like Figure 3As shown, the adjustable amplitude unit specifically includes multiple groups of amplitude adjustment units, which are connected in parallel, one end of which is connected to the input end, and the other end is grounded. The amplitude adjustment unit specifically includes: a variable resistance diode, an inductor, and a capacitor; the input signal at the input end is grounded after passing through a variable resistance diode and an inductor, and the capacitor and the inductor are connected in parallel. The receiving control unit adjusts the voltage to balance the signal. The circuit principle consists of one or more groups of variable resistance diodes, capacitors and inductors. The signal balance amplitude is adjusted by controlling the voltage to change the resistance value of the variable resistance diode.

[0020] like Figure 5 As shown, the control unit specifically uses the DAC output voltage to adjust the signal and signal amplitude in fine steps, specifically including: a digital-to-analog converter, an ACU, and multiple analog-to-digital converters; the multiple analog-to-digital converters are specifically two; the feedback network input signal is transmitted to the two analog-to-digital converters respectively through the digital-to-analog converter and then through the ACU, and then transmitted to the voltage-controlled attenuator and the adjustable equalizing unit respectively. The feedback network input signal size, output signal power size, and signal in-band amplitude are received, and the DAC output voltage is used to adjust the signal and signal amplitude in fine steps to make the input and output signals consistent and the signal amplitude reach the preset value. The control signal output by the controller is a digital signal, which is converted into an analog signal by a digital-to-analog converter (DAC) to drive the input voltage-controlled attenuation compensation signal to make the input and output signals consistent; drive the variable resistance diode of the adjustable equalizing unit to adjust the signal amplitude balance, and the minimum amplitude balance step can achieve 0.1dB.

[0021] The specific calculation formula for amplitude fine step adjustment is: delta A = A max / 2 M ; In the formula, delta A Indicates the minimum step of amplitude adjustment; A max Indicates the maximum adjustable range of the equalization system; M indicates the number of bits of adjustment accuracy; the performance of the equalization system is evaluated by the mean square error MSE: MSE = (1 / N) * sum n=1 N |e(n)| 2 ; Where N is the number of observed samples; e(n) = d(n) - |w(n) T * x(n)| represents the error signal at the (n)th iteration; d(n) represents the expected signal; w(n) T * x(n) represents the output of the balanced system.

[0022] like Figure 4As shown, the output end specifically includes impedance matching and output signal coupling; the impedance matching specifically adopts a multi-section λ / 4 transformation line or a T-type matching network. Impedance matching and output signal coupling are realized. The principle of amplitude equalization is that the far-end out-of-band frequency is generated due to resonance, and the amplitude steep section is taken to achieve it, introducing the impedance mismatch of the in-band signal. By adopting a multi-section λ / 4 transformation line or a T-type matching network, the impedance matching between the equalizer and the transmission line is achieved to reduce signal reflection; the coupled signal enters the feedback network to monitor the size and amplitude of the equalized signal. A three-section transformation matching is selected, and the characteristic impedances Z1, Z2 and Z3 are calculated by the following formula: ; ; .

[0023] After the feedback network receives the signals at the output and input ends and performs signal detection, it transmits the input signal power and amplitude, and the output signal power and amplitude to the control unit. The monitoring signal is received, the start and end frequencies of the broadband signal and the signal size at the center frequency are detected, and sent to the control unit. The signal power is determined by the center frequency AD value, and the signal amplitude within the band is determined by the difference between the start and end frequency AD values.

[0024] The input terminal receives a signal from a broadband communication system. The signal passes through an adjustable equalization unit, such as a variable resistance diode device, to adjust the signal amplitude in fine steps. The control unit controls the adjustment of the adjustable equalization unit according to the feedback network and the preset adjustment algorithm to achieve fine compensation of the signal amplitude. Finally, the adjusted signal is output from the output terminal.

[0025] The working principle specifically includes: receiving a broadband signal through the input end; the control unit analyzes the amplitude characteristics of the signal and makes fine-step amplitude adjustments to the adjustable equalizing unit according to the analysis results; the output end outputs the signal after fine-step amplitude adjustment; the feedback network monitors the amplitude characteristics of the input and output signals in real time, and feeds back the monitoring results to the control unit, and the control unit further adjusts the adjustable equalizing unit according to the feedback results to keep the signal amplitude characteristics stable.

[0026] The present invention can achieve high-precision, fine-step amplitude adjustment within a wide frequency band, effectively compensating for amplitude distortion of signals during transmission. It has a simple structure, is easy to integrate, and is suitable for a variety of broadband communication systems; it improves signal transmission quality and the overall performance of the communication system.

[0027] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A broadband fine-step adjustable amplitude equalization system, characterized in that: It includes an input terminal, an output terminal, an adjustable amplitude unit, a control unit, and a feedback network; The external input broadband signal is input into the amplitude equalization system through the input end and is divided into two groups of signals, one group of signals is output from the output end through the adjustable amplitude unit, and the other group is input into the control unit through the feedback network; the output end inputs the output signal amplitude into the control unit via the feedback network; the control unit inputs the DAC voltage into the adjustable equalization unit.

2. The broadband fine-step adjustable amplitude equalization system according to claim 1, characterized in that: The input end specifically includes: a signal coupler, an amplifier, and a voltage-controlled attenuator; The external input signal is divided into two groups of signals through a signal coupler, one group is transmitted to the feedback network, and the other group is input into the voltage-controlled attenuator after passing through the amplifier. The voltage-controlled attenuator receives the control ADC signal and the amplified signal and transmits them to the adjustable equalization unit after processing.

3. The broadband fine-step adjustable amplitude equalization system according to claim 1, characterized in that: The adjustable amplitude unit specifically includes a plurality of groups of amplitude adjustment units, which are connected in parallel, with one end connected to the input end and the other end grounded.

4. The broadband fine-step adjustable amplitude equalization system according to claim 3, characterized in that: The amplitude adjustment unit specifically includes: a variable resistance diode, an inductor, and a capacitor; an input signal at the input end is grounded after passing through the variable resistance diode and the inductor, and the capacitor and the inductor are connected in parallel.

5. The broadband fine-step adjustable amplitude equalization system according to claim 2, characterized in that: The control unit specifically uses the DAC output voltage to perform fine step adjustment of the signal and the signal amplitude, and specifically includes: a digital-to-analog converter, an ACU, and multiple analog-to-digital converters; the multiple analog-to-digital converters are specifically two; the feedback network input signal is transmitted to the two analog-to-digital converters respectively through the digital-to-analog converter and then through the ACU, and then respectively transmitted to the voltage-controlled attenuator and the adjustable equalization unit.

6. The broadband fine-step adjustable amplitude equalization system according to claim 5, characterized in that: The specific calculation formula for the amplitude fine step adjustment is: delta A = A max / 2 M ; In the formula, delta A Indicates the minimum step of amplitude adjustment; A max Indicates the maximum range that the equalization system can adjust; M indicates the number of bits of adjustment accuracy; Specifically, the performance of the equalization system is evaluated by the mean square error MSE: MSE = (1 / N) * sum n=1 N |e(n)| 2 ; Where N is the number of observed samples; e(n) = d(n) - |w(n) T * x(n)| represents the error signal at the (n)th iteration; d(n) represents the expected signal; w(n) T * x(n) represents the output of the balanced system.

7. The broadband fine-step adjustable amplitude equalization system according to claim 1, characterized in that: The output end specifically includes impedance matching and output signal coupling; the impedance matching specifically adopts a multi-section λ / 4 transformation line or a T-type matching network.

8. The broadband fine-step adjustable amplitude equalization system according to claim 1, characterized in that: After receiving the signals at the output end and the input end and performing signal detection, the feedback network transmits the input signal power and amplitude, and the output signal power and amplitude to the control unit.

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