CN113098548B - Transmitting link, transmitting link calibration method, device and digital transceiver - Google Patents
Transmitting link, transmitting link calibration method, device and digital transceiver Download PDFInfo
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- CN113098548B CN113098548B CN202110382211.6A CN202110382211A CN113098548B CN 113098548 B CN113098548 B CN 113098548B CN 202110382211 A CN202110382211 A CN 202110382211A CN 113098548 B CN113098548 B CN 113098548B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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Abstract
The application relates to a transmission link, a transmission link calibration method, a transmission link calibration device and a digital transceiver. The transmission chain comprises: the monitoring unit comprises an intermediate frequency detection circuit and a control circuit which are connected in sequence; the intermediate frequency detection circuit is used for performing power detection on the received intermediate frequency signal to obtain an intermediate frequency detection voltage and outputting the intermediate frequency detection voltage to the control circuit; the control circuit is used for acquiring the corresponding relation between the detection voltage and the first control voltage and determining the first control voltage corresponding to the intermediate frequency detection voltage from the corresponding relation; the intermediate frequency processing unit comprises a first-stage attenuation circuit connected with the control circuit; the first-stage attenuation circuit is used for receiving the intermediate frequency signal and attenuating the intermediate frequency signal according to the first control voltage, so that the signal power of the attenuated first attenuation signal is within a preset power range. The transmitting link can reduce the occurrence frequency of error codes, link interruption and the like, and improve the communication reliability.
Description
Technical Field
The present application relates to the field of microwave communications technologies, and in particular, to a transmission link, a method and an apparatus for calibrating the transmission link, and a digital transceiver.
Background
With the development of microwave communication technology, a microwave communication system generally includes an IDU (Indoor Unit), an intermediate frequency cable, an ODU (Outdoor Unit), and an antenna, where the ODU may be a digital transceiver. The IDU is installed in a machine room near a base station tower, the ODU is installed on the base station tower, and the ODU and the IDU are connected through an intermediate frequency cable. Because the distance between the ODU and the IDU is not fixed, the length of the if cable is difficult to determine, so that the loss of the if cable to the if signal is also not determined. Therefore, it is necessary to introduce an intermediate frequency power calibration to enable the ODU to obtain an intermediate frequency signal with a fixed power, so as to facilitate the post-processing of the intermediate frequency signal.
However, with the rapid development of the communication industry, the signal frequency, the signal transmission rate, the communication data volume and other aspects are greatly changed, and the conventional technology cannot meet the application requirements of high modulation and high bandwidth, and has the problem of poor communication reliability.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a transmission link, a transmission link calibration method, a device and a digital transceiver, which can improve communication reliability.
A transmit chain, comprising:
the monitoring unit comprises an intermediate frequency detection circuit and a control circuit which are connected in sequence; the intermediate frequency detection circuit is used for performing power detection on the received intermediate frequency signal to obtain an intermediate frequency detection voltage and outputting the intermediate frequency detection voltage to the control circuit; the control circuit is used for acquiring the corresponding relation between the detection voltage and the first control voltage and determining the first control voltage corresponding to the intermediate frequency detection voltage from the corresponding relation;
the intermediate frequency processing unit comprises a first-stage attenuation circuit connected with the control circuit; the first-stage attenuation circuit is used for receiving the intermediate-frequency signal and attenuating the intermediate-frequency signal according to the first control voltage so that the signal power of the attenuated first attenuation signal is within a preset power range.
In one embodiment, the intermediate frequency processing unit further includes a second stage attenuation circuit, and the second stage attenuation circuit is respectively connected to the first stage attenuation circuit and the control circuit. The control circuit is also used for outputting a second control voltage; the second-stage attenuation circuit is used for attenuating the first attenuation signal according to the second control voltage and outputting a second attenuation signal obtained through attenuation.
In one embodiment, the transmission link further comprises an output port and a microwave processing unit, the microwave processing unit comprises a microwave signal processing circuit and a third-stage attenuation circuit, and the intermediate frequency processing unit further comprises a first up-conversion circuit;
the first up-conversion circuit is connected with the second-stage attenuation circuit and is used for up-converting the second attenuation signal and outputting a microwave signal obtained by frequency conversion; the microwave signal processing circuit is connected with the first up-conversion circuit and is used for carrying out signal processing on the microwave signal and outputting the processed microwave signal; the control circuit is also used for outputting a third control voltage according to the output power fluctuation value; the third-stage attenuation circuit is respectively connected with the output port, the microwave signal processing circuit and the control circuit, and is used for attenuating the processed microwave signal according to a third control voltage to obtain a third attenuation signal and outputting the third attenuation signal to the output port.
In one embodiment, the control circuit comprises a microcontroller and a digital-to-analog controller, the microcontroller is respectively connected with the intermediate frequency detection circuit and the digital-to-analog converter, and the digital-to-analog converter is connected with the first-stage attenuation circuit.
A digital transceiver comprising the above transmit chain.
The transmitting link and the digital transceiver comprise a monitoring unit and an intermediate frequency processing unit, wherein the monitoring unit comprises an intermediate frequency detection circuit and a control circuit which are sequentially connected, and the intermediate frequency processing unit comprises a first-stage attenuation circuit connected with the control circuit. The intermediate frequency detection circuit is used for carrying out power detection on the received intermediate frequency signal to obtain an intermediate frequency detection voltage; the control circuit is used for acquiring the corresponding relation between the detection voltage and the first control voltage and determining the first control voltage corresponding to the intermediate frequency detection voltage from the corresponding relation; the first-stage attenuation circuit is used for attenuating the intermediate frequency signal according to the first control voltage, so that the signal power of the attenuated first attenuation signal is within a preset power range. When the intermediate frequency calibration is carried out, a feedback loop is not required to be arranged between the control circuit and the first-stage attenuation circuit, the control circuit is in an open-loop state on hardware, and closed-loop automatic gain control is realized through software configuration, so that the transmitted intermediate frequency power is kept constant, the stability of the transmitted intermediate frequency power and the phase and MSE stability of a transmitted signal are improved, the occurrence frequency of error codes, link interruption and other conditions is further reduced, and the communication reliability is improved.
A calibration method of a transmitting link is applied to a calibration device of the transmitting link, the calibration device of the transmitting link comprises an intermediate frequency source, a power meter and the transmitting link, the intermediate frequency source is respectively connected with an intermediate frequency detection circuit and a first-stage attenuation circuit, and the power meter is connected with an output port. The method comprises the following steps:
obtaining each test power;
for each test power, outputting a power control signal according to the test power, wherein the power control signal is used for indicating an intermediate frequency source to output an intermediate frequency signal of the test power; acquiring microwave signal power output by a power meter, and adjusting the control voltage applied to the first-stage attenuation circuit to a first control voltage according to the microwave signal power so as to enable the microwave signal power to be rated power; and acquiring the detection voltage under the test power, generating a corresponding relation between the detection voltage and the first control voltage, and outputting the corresponding relation to the control circuit.
In one embodiment, the step of adjusting the control voltage applied to the first stage attenuation circuit to a first control voltage based on the microwave signal power comprises:
when the test power is equal to the maximum test power, adjusting the control voltage applied to the first-stage attenuation circuit to the initial voltage, and adjusting the control voltage applied to the second-stage attenuation circuit to the target voltage so as to enable the microwave signal power to be the rated power;
when the test power is smaller than the maximum test power, the control voltage applied to the second-stage attenuation circuit is kept as the target voltage, and the control voltage applied to the first-stage attenuation circuit is adjusted to the first control voltage, so that the microwave signal power is the rated power.
In one embodiment, the initial voltage is a control voltage corresponding to the maximum attenuation when the first attenuation circuit operates in the linear region.
In one embodiment, the step of obtaining each test power includes: and acquiring an adjustment step length and a test power range, and determining each test power according to the adjustment step length and the test power range.
A transmit chain calibration apparatus comprising:
the above-mentioned transmission link;
the intermediate frequency source is respectively connected with the intermediate frequency detection circuit and the first-stage attenuation circuit and is used for outputting intermediate frequency signals;
the power meter is connected with the output port and used for receiving the microwave signal output by the transmitting link and measuring the microwave signal power of the microwave signal;
and the PC equipment is respectively connected with the intermediate frequency source, the power meter and the control circuit and is used for executing the steps of the transmission link calibration method.
According to the method and the device for calibrating the transmitting link, each testing power is obtained, and for each testing power, a power control signal is output according to the testing power, wherein the power control signal is used for indicating an intermediate frequency source to output an intermediate frequency signal of the testing power; acquiring microwave signal power output by a power meter, and adjusting the control voltage applied to the first-stage attenuation circuit to a first control voltage according to the microwave signal power so as to enable the microwave signal power to be rated power; the detection voltage under the test power is obtained, the corresponding relation between the detection voltage and the first control voltage is generated, and the corresponding relation is output to the control circuit, so that the first control voltage corresponding to each detection voltage can be comprehensively covered, when the signal power of the intermediate-frequency signal input to the transmission link is changed, the control circuit can also determine the corresponding first control voltage from the corresponding relation, the transmission intermediate-frequency power is kept constant, and the stability of the transmission intermediate-frequency power is improved. Meanwhile, the first control circuit can be directly obtained by inquiring the corresponding relation, and the intermediate frequency calibration efficiency of the transmitting link is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a first schematic block diagram of a transmit chain in one embodiment;
FIG. 2 is a block diagram of a second schematic structure of a transmit chain in one embodiment;
FIG. 3 is a third schematic block diagram of a transmit chain in one embodiment;
FIG. 4 is a circuit diagram of a transmit chain in one embodiment;
FIG. 5 is a block diagram of a schematic architecture of a digital transceiver in one embodiment;
FIG. 6 is a flow diagram illustrating a method for transmit chain calibration in one embodiment;
fig. 7 is a schematic structural diagram of a transmit chain calibration apparatus in one embodiment.
Description of the reference numerals: 100-monitoring unit, 110-intermediate frequency detection circuit, 120-control circuit, 200-intermediate frequency processing unit, 210-first stage attenuation circuit, 220-second stage attenuation circuit, 230-up conversion circuit, 300-microwave processing unit, 310-microwave signal processing circuit, 320-third stage attenuation circuit.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. In addition, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", and the like if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," or "having," and the like, specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
As mentioned in the background, the digital transceiver in the prior art has a problem of poor communication reliability, and the inventor finds that the problem is caused because the conventional digital transceiver implements automatic gain control by means of hardware circuit closed-loop control to achieve the purpose of intermediate frequency power calibration. Under the circumstance, the implementation manner of the hardware circuit closed-loop control cannot meet the application requirements of a system with high modulation and high bandwidth, and when the environmental temperature changes, the digital transceiver has the problems of phase jitter, mean Square Error (MSE) jitter and the like, which causes the situations of Error code, even link interruption and the like, and further has the problem of poor communication reliability.
In view of the above, there is a need for a transmit link, a transmit link calibration method, an apparatus, and a digital transceiver that can improve communication reliability.
In one embodiment, as shown in fig. 1, a transmit chain is provided that includes a monitoring unit 100 and an intermediate frequency processing unit 200. The monitoring unit 100 includes an intermediate frequency detection circuit 110 and a control circuit 120, which are connected in sequence; the if detection circuit 110 is configured to perform power detection on the received if signal to obtain an if detection voltage, and output the if detection voltage to the control circuit 120; the control circuit 120 is configured to obtain a correspondence relationship between the detection voltage and the first control voltage, and determine the first control voltage corresponding to the intermediate frequency detection voltage from the correspondence relationship. The if processing unit 200 includes a first stage attenuator circuit 210 connected to the control circuit 120; the first stage attenuation circuit 210 is configured to receive the intermediate frequency signal, and attenuate the intermediate frequency signal according to a first control voltage, so that a signal power of the attenuated first attenuated signal is within a preset power range.
The transmission link may be a circuit that generates a microwave signal from a received intermediate frequency signal and outputs the microwave signal, and may be applied to various types of communication devices, such as digital transceivers and base station devices. Because the power of the intermediate frequency signal received by the transmitting link is uncertain, the power of the intermediate frequency signal may have a large difference in different application scenarios or different microwave communication systems, and therefore the transmitting link needs to calibrate the signal power of the intermediate frequency signal, so that the post-processing of the intermediate frequency signal can be smoothly performed, and the reliability of communication is improved.
Specifically, the transmission link includes a monitoring unit 100 and an intermediate frequency processing unit 200, where the monitoring unit 100 refers to a circuit for monitoring and calibrating and controlling the received intermediate frequency signal, and further, the monitoring unit 100 can also monitor and control the transmission intermediate frequency power and implement a closed-loop function of automatic gain control. The if processing unit 200 is a circuit for calibrating an if signal under the Control of the monitoring unit 100, and may specifically include sub-circuits such as an AGC (Automatic Gain Control), a frequency mixing and/or a filtering amplification, where each sub-circuit is used to perform amplification, filtering and/or primary up-conversion on the if signal, and output the if signal with stable power to a post-processing unit.
The monitoring unit 100 may include an intermediate frequency detection circuit 110 and a control circuit 120, and in one embodiment, the monitoring unit 100 may further include a radio frequency power control circuit 120 and/or a received power monitoring circuit, etc. The if processing unit 200 includes a first stage attenuator circuit 210, the first stage attenuator circuit 210 is connected to the control circuit 120, and the control circuit 120 is connected to the if detector circuit 110. When the transmitting chain receives the if signal, the if detection circuit 110 performs power detection on the if signal to obtain an if detection voltage, and outputs the if detection voltage to the control circuit 120. The magnitude of the intermediate frequency detection voltage is related to the power magnitude of the received intermediate frequency signal, in other words, the power magnitude of the intermediate frequency signal can be determined by the voltage magnitude of the intermediate frequency detection voltage.
The control circuit 120 may obtain a corresponding relationship between the detection voltage and a first control voltage in advance, where the first control voltage is a control voltage applied to the first stage attenuation circuit 210, and the first control voltage may control an attenuation amount of the first stage attenuation circuit 210, so that the first stage attenuation circuit 210 performs a corresponding attenuation process on the intermediate frequency signal and outputs the intermediate frequency signal with a constant power. The corresponding relationship reflects the power if signals and the corresponding control voltage of the first stage attenuator circuit 210, and if the control voltage applied to the first stage attenuator circuit 210 is adjusted according to the corresponding relationship, the power of the if signal output from the first stage attenuator circuit 210 can be kept unchanged.
The control circuit 120, upon receiving the if detection voltage output from the if detection circuit 110, determines a first control voltage corresponding to the if detection voltage from the obtained correspondence relationship, and applies the first control voltage to the first stage attenuation circuit 210 to adjust the attenuation amount of the first stage attenuation circuit 210. The first-stage attenuation circuit 210 receives the intermediate frequency signal, attenuates the intermediate frequency signal according to the first control voltage, obtains and outputs a first attenuation signal, so that the signal power of the first attenuation signal can fall within a preset power range, the intermediate frequency signal with variable power is adjusted to the first attenuation signal with constant power, the automatic gain control effect is achieved, and the loss caused by intermediate frequency cables at different distances is solved.
It should be noted that "constant power" and "power remains unchanged" in this application may refer to that the power is kept at a certain value, or that the power falls within a preset power range, where the preset power range may be determined according to factors such as the type of the application device of the transmission link, the application scenario, the communication system, and the design requirement, and this application is not limited specifically.
The transmitting chain comprises a monitoring unit 100 and an intermediate frequency processing unit 200, wherein the monitoring unit 100 comprises an intermediate frequency detection circuit 110 and a control circuit 120 which are connected in sequence, and the intermediate frequency processing unit 200 comprises a first-stage attenuation circuit 210 connected with the control circuit 120. The if detection circuit 110 is configured to perform power detection on the received if signal to obtain an if detection voltage; the control circuit 120 is configured to obtain a correspondence relationship between the detection voltage and the first control voltage, and determine the first control voltage corresponding to the intermediate frequency detection voltage from the correspondence relationship; the first stage attenuation circuit 210 is configured to attenuate the intermediate frequency signal according to the first control voltage, so that the signal power of the attenuated first attenuated signal is within a preset power range. When the intermediate frequency calibration is performed, a feedback loop is not required to be arranged between the control circuit 120 and the first-stage attenuation circuit 210, the control circuit 120 is in an open-loop state on hardware, and closed-loop automatic gain control is realized through software configuration, so that the transmitted intermediate frequency power is kept constant, the stability of the transmitted intermediate frequency power and the phase and MSE stability of a transmitted signal are improved, the occurrence frequency of the conditions of error codes, link interruption and the like is further reduced, and the communication reliability is improved.
In one embodiment, as shown in fig. 2, the if processing unit 200 further includes a second stage attenuation circuit 220, and the second stage attenuation circuit 220 is respectively connected to the first attenuation circuit and the control circuit 120. The control circuit 120 is further configured to output a second control voltage; the second stage attenuation circuit 220 is configured to attenuate the first attenuated signal according to the second control voltage and output a second attenuated signal obtained by the attenuation.
Specifically, after the first stage attenuation circuit 210 outputs the first attenuation signal with constant power, in order to adapt the signal to the subsequent link, the power of the intermediate frequency signal needs to be adjusted, that is, the first attenuation signal needs to be adjusted, and the adjusted signal is output to the subsequent link, so that the subsequent link can process the signal.
According to the application, the intermediate frequency processing unit 200 is provided with the second-stage attenuation circuit 220, the control end of the second-stage attenuation circuit 220 is connected with the output end of the control circuit 120, the input end of the second-stage attenuation circuit 220 is connected with the output end of the first-stage attenuation circuit 210, and the output end of the second-stage attenuation circuit 220 is connected with the rear-stage link.
The control circuit 120 is used for outputting a second control voltage, which is a control voltage applied to the second stage damping circuit 220, for adjusting the damping amount of the second stage damping circuit 220. The voltage value of the second control voltage may be kept constant, or may be adjusted within a certain range, for example, fine-tuned within a certain range according to the target output power of the transmission link. The target output power refers to an expected output power of the transmission link, that is, a signal power required to be output by the transmission link. The second attenuation circuit 220 receives the first attenuation signal, re-attenuates the first attenuation signal according to the second control voltage to obtain a second attenuation signal, and outputs the second attenuation signal to the subsequent link, so that the subsequent link performs further processing.
In this embodiment, by setting the second-stage attenuation circuit 220, the signal power of the first attenuation signal can be adjusted, which is convenient for processing the subsequent link, so that the transmission link can be kept smooth all the time, and the communication reliability is further improved.
In one embodiment, as shown in fig. 3, the transmission chain further includes an output port and a microwave processing unit 300, the microwave processing unit 300 includes a microwave signal processing circuit 310 and a third stage attenuation circuit 320, and the intermediate frequency processing unit 200 further includes a first up-conversion circuit 230. The first up-conversion circuit 230 is connected to the second-stage attenuation circuit 220, and is configured to up-convert the second attenuated signal and output a microwave signal obtained by frequency conversion; the microwave signal processing circuit 310 is connected to the first up-conversion circuit 230, and is configured to perform signal processing on the microwave signal and output the processed microwave signal; the control circuit 120 is further configured to output a third control voltage according to the output power fluctuation value; the third attenuation circuit 320 is respectively connected to the output port, the microwave signal processing circuit 310 and the control circuit 120, and is configured to attenuate the processed microwave signal according to a third control voltage to obtain a third attenuated signal, and output the third attenuated signal to the output port.
Specifically, the second stage attenuation circuit 220, the first up-conversion circuit 230, the microwave signal processing circuit 310 and the third stage attenuation circuit 320 may be connected in sequence, and the third stage attenuation circuit 320 is further connected to the control circuit 120 and the output port, respectively. After the second-stage attenuation circuit 220 outputs the second attenuation signal, the first up-conversion circuit 230 performs up-conversion processing on the second attenuation signal to obtain a microwave signal, and outputs the microwave signal to the microwave signal processing circuit 310. The microwave signal processing circuit 310 performs signal processing on the input microwave signal, wherein the specific processing procedure includes, but is not limited to, secondary up-conversion, filtering and/or amplification, and outputs the processed microwave signal (i.e., radio frequency signal) to the third stage attenuation circuit 320. It should be noted that, after the microwave signal is subjected to the secondary up-conversion, the frequency of the microwave signal will change, and the frequency of the signal input into the microwave processing unit 300 and the frequency of the signal output from the microwave processing unit 300 are two different frequencies.
In one embodiment, the microwave signal processing circuit 310 may include a radio frequency detector circuit, an attenuator circuit, and other sub-circuits, which are used to cooperate with the control circuit 120 to achieve the control of the radio frequency power. The third stage attenuation circuit 320 receives a third control voltage output by the control circuit 120 based on the output power fluctuation value, and attenuates the processed microwave signal according to the third control voltage to obtain a third attenuated signal. The third stage attenuation circuit 320 also outputs a third attenuated signal to the output port. The output power fluctuation value refers to a power fluctuation value of a microwave signal output by a final stage circuit of the transmission link, and it can be understood that, in addition to the circuits related to the present application, the transmission link may further include more functional circuits to implement corresponding functions, and at this time, the power fluctuation value of an output signal of the final stage circuit of the transmission link is the output power fluctuation value.
It should be noted that the third stage attenuation circuit 320 may be directly connected to the output port, and output the third attenuated signal through the output port, where the third attenuated signal is an output signal of the transmission link. In addition, the third stage attenuation circuit 320 can also be connected to the output port through a centering circuit (such as an amplifying circuit, etc.), and the output signal of the transmission link is the third attenuated signal processed by the centering circuit.
In this embodiment, since the microwave signal processing circuit 310 includes many environmentally sensitive (e.g., temperature sensitive) elements, the output power of the microwave signal processing circuit 310 is easy to change along with the change of the environmental factors, and therefore, it is necessary to adjust through the third-stage attenuation circuit 320, so as to reduce the influence of the environmental factors on the output power of the transmission link, so as to further improve the communication reliability.
In one embodiment, the control circuit 120 includes a microcontroller and a digital-to-analog converter. The microcontroller is connected to the intermediate frequency detection circuit 110 and the input end of the digital-to-analog converter DA1, and the first output end of the digital-to-analog converter DA1 is connected to the first stage attenuation circuit 210. Specifically, the Microcontroller Unit (MCU) is configured to obtain a corresponding relationship between the pickup voltage and the first control voltage, determine the first control voltage corresponding to the intermediate-frequency pickup voltage from the corresponding relationship, and output the first control voltage to the digital-to-analog converter DA1. The digital-to-analog converter DA1 performs digital-to-analog conversion on the first control voltage, and then applies the obtained analog signal to the first-stage attenuation circuit 210 to adjust the attenuation amount of the first-stage attenuation circuit 210.
In one embodiment, the second output terminal of the digital-to-analog converter DA1 may be further connected to a second attenuator for performing digital-to-analog conversion on the second control voltage and applying the converted analog signal to the second stage attenuation circuit 220.
In one embodiment, the control circuit 120 may further include a storage device for storing a corresponding relationship between the detected voltage and the first control voltage, and the microcontroller may query the corresponding first control voltage by accessing the storage device. Therefore, the interaction times of the transmitting link and the external equipment can be reduced, the corresponding first control voltage can be obtained through local query, the obtaining speed of the first control voltage is improved, the influence caused by poor network communication is reduced, and the communication reliability is further improved.
In this embodiment, the control circuit 120 is implemented by a microcontroller and a digital-to-analog converter, so that a hardware circuit can be simplified and cost can be saved.
To facilitate understanding of the aspects of the present application, a specific example will be described below. As shown in fig. 4, a transmission chain is provided, and the transmission chain includes a first attenuator ATT1, a first amplifier A1, a second attenuator ATT2, a second amplifier A2, a first mixer M1, a third amplifier A3, a first filter F1, a second mixer M2, a second filter F2, a fourth amplifier A4, a third attenuator ATT3, and a fifth amplifier A5, which are connected in sequence. The transmitting link further comprises an MCU, a digital-to-analog converter DA1, a digital-to-analog converter DA2, a radio frequency power control circuit 120, an intermediate frequency detection circuit 110 and a radio frequency detection circuit, the MCU is respectively connected with the digital-to-analog converter DA1, the digital-to-analog converter DA2, the radio frequency power control circuit 120, the intermediate frequency detection circuit 110 and the radio frequency detection circuit, and the radio frequency detection circuit is connected with a fifth amplifier A5. The digital-to-analog converter DA1 is respectively connected with the first attenuator ATT1 and the second attenuator ATT2, the digital-to-analog converter DA2 is connected with the radio frequency power control circuit 120, and the radio frequency power control circuit 120 is connected with the third attenuator ATT3.TX is the output signal of the transmit chain.
After the intermediate frequency signal is input to the transmission link, the intermediate frequency detection circuit 110 performs power detection on the intermediate frequency signal, and outputs an intermediate frequency detection voltage obtained by the detection to the MCU. The MCU acquires the corresponding relation between the detection voltage and the first control voltage, inquires the corresponding relation to obtain the first control voltage corresponding to the intermediate frequency detection voltage, and applies the first control voltage to the first attenuator ATT1 through the digital-to-analog converter DA1. Thus, the first stage attenuation circuit 210 attenuates the input if signal to output a first attenuated signal with constant power. The first attenuated signal is sequentially processed by the first amplifier A1, the second attenuator ATT2, and the second amplifier A2, and then input to the first mixer M1. The first mixer M1 is configured to perform primary up-conversion on an input intermediate frequency signal and output a microwave signal. The microwave signal is amplified and filtered by the third amplifier A3 and the first filter F1 in sequence, and then input to the second mixer M2. The second mixer M2 is configured to perform secondary up-conversion on the microwave signal, and output a secondary microwave signal obtained by frequency conversion. And the secondary microwave signals are processed and output by a second filter F2, a fourth amplifier A4, a third attenuator ATT3 and a fifth amplifier A5 in sequence.
In the process of outputting the microwave signal by the transmission link, the radio frequency detection circuit performs power detection on the output microwave signal to obtain a radio frequency detection voltage, and outputs the radio frequency detection voltage to the MCU, so that the MCU obtains the current output power of the transmission link. Meanwhile, the rf detection circuit outputs the rf detection voltage to the rf power control circuit 120. Specifically, the rf power control circuit 120 may include an operational amplifier, a first input terminal of the operational amplifier is connected to the MCU, a second input terminal of the operational amplifier is connected to the rf power control circuit 120, and an output terminal of the operational amplifier is connected to the third attenuator ATT3.
When the output power of the transmission link fluctuates with the ambient temperature, the output power of the transmission link may change, resulting in a change in the rf detection voltage. At this time, the operational amplifier integrates the rf detection voltage and the third control voltage output by the MCU, and outputs the final third control voltage to the third attenuator ATT3, so as to adjust the attenuation of the third attenuator ATT3, so that the output power of the whole device is kept constant.
When the target output power of the transmission link is adjusted, the voltage value of the third control voltage output by the MCU can be changed, that is, the MCU can adjust the magnitude of the third control voltage output by the MCU according to the target output power to adjust the attenuation of the third attenuator ATT3, so that the output power of the whole device is adjusted to the target output power.
The transmitting link can realize closed-loop automatic gain control under the condition of hardware open loop, thereby keeping the transmitting intermediate frequency power constant, improving the stability of the transmitting intermediate frequency power and the phase and MSE stability of transmitting signals, further reducing the occurrence frequency of error codes, link interruption and other conditions, and improving the communication reliability. Meanwhile, the hardware circuit is simple and can save cost.
In one embodiment, as shown in fig. 5, a digital transceiver is provided that includes the transmit chain of any of the above embodiments. In one embodiment, the digital transceiver may further include a receiving chain and a cavity filter, wherein the receiving chain may be a circuit for generating an intermediate frequency signal according to a received microwave signal, and may perform down-conversion, amplification, filtering, and/or AGC processing on the received microwave signal to output an intermediate frequency signal with stable power. The cavity filter can filter the microwave signal output by the transmitting link to inhibit the out-of-band spurious signal from being sent to the free space, and can separate and combine the transmitting signal and the receiving signal.
In one embodiment, a method for calibrating a transmission link is provided, and the method is applicable to a transmission link calibration apparatus, which includes an if source, a power meter and the transmission link in the above embodiments, wherein the if source is connected to the if detection circuit 110 and the first stage attenuation circuit 210, respectively, and the power meter is connected to an output port. Further, the method may be performed on a control device, such as a PC device, of the transmit link calibration apparatus.
Referring to fig. 6, the method includes:
step 610, obtaining each test power;
step 620, for each test power, outputting a power control signal according to the test power, wherein the power control signal is used for indicating an intermediate frequency source to output an intermediate frequency signal of the test power; acquiring microwave signal power output by a power meter, and adjusting the control voltage applied to the first-stage attenuation circuit 210 to a first control voltage according to the microwave signal power so as to make the microwave signal power be rated power; the detection voltage under the test power is acquired, the correspondence relationship between the detection voltage and the first control voltage is generated, and the correspondence relationship is output to the control circuit 120.
Specifically, the PC device may acquire all the test powers at once, or may acquire each test power one by one. After the test power is obtained, determining a first control voltage corresponding to the test power by the following steps for each test power: and the PC equipment outputs a power control signal to the intermediate frequency source according to the current test power so as to enable the intermediate frequency source to output an intermediate frequency signal with the power as the test power to the transmitting link. The transmitting link converts the intermediate frequency signal output by the intermediate frequency source into a microwave signal and outputs the microwave signal to the power meter, so that the signal power of the current microwave signal (i.e. the microwave signal power) can be detected by the power meter. The PC device can obtain the power of the microwave signal detected by the power meter by communicating with the power meter, and adjust the control voltage applied to the first stage attenuator circuit 210 to the first control voltage through the control circuit 120 according to the power of the microwave signal, so that the transmitting link outputs the microwave signal with the rated power. The PC device can obtain the detection voltage and the corresponding first control voltage at the current test power through the control circuit 120 of the transmission link, and generate the corresponding relationship between the detection voltage and the first control voltage.
In one embodiment, the PC device may determine whether the current microwave signal power is the rated power, determine the corresponding control voltage as the first control voltage if the current microwave signal power is the rated power, and continue to adjust the control voltage applied to the first stage attenuator circuit 210 through the control circuit 120 in the transmitting link if the current microwave signal power is the rated power until the transmitting link outputs the microwave signal of the rated power.
For each test power, the PC device executes the above-described procedure, thereby obtaining a correspondence relationship between the detected voltage and the first control voltage for each test power, and outputs the correspondence relationship to the control circuit 120. In one embodiment, the corresponding relationship may further include test power, that is, the PC device may generate the corresponding relationship between the test power, the detection voltage, and the first control voltage, so as to facilitate the data reading of the inspector.
According to the method for calibrating the transmitting link, each testing power is obtained, and for each testing power, a power control signal is output according to the testing power, wherein the power control signal is used for indicating an intermediate frequency source to output an intermediate frequency signal of the testing power; acquiring microwave signal power output by a power meter, and adjusting the control voltage applied to the first-stage attenuation circuit 210 to a first control voltage according to the microwave signal power so as to make the microwave signal power be rated power; the detection voltage under the test power is obtained, the corresponding relation between the detection voltage and the first control voltage is generated, and the corresponding relation is output to the control circuit 120, so that the first control voltage corresponding to each detection voltage can be comprehensively covered, when the signal power of the intermediate frequency signal input to the transmission link changes, the control circuit 120 can also determine the corresponding first control voltage from the corresponding relation, the transmission intermediate frequency power is kept constant, and the stability of the transmission intermediate frequency power is improved. Meanwhile, the first control circuit 120 can be directly obtained by inquiring the corresponding relation, and the intermediate frequency calibration efficiency of the transmission link is improved.
In one embodiment, the step of adjusting the control voltage applied to the first stage attenuator circuit 210 to a first control voltage based on the microwave signal power includes:
when the test power is equal to the maximum test power, adjusting the control voltage applied to the first-stage attenuation circuit 210 to the initial voltage, and adjusting the control voltage applied to the second-stage attenuation circuit 220 to the target voltage, so that the microwave signal power is the rated power;
when the test power is less than the maximum test power, the control voltage applied to the second-stage attenuation circuit 220 is maintained at the target voltage, and the control voltage applied to the first-stage attenuation circuit 210 is adjusted to the first control voltage, so that the microwave signal power is the rated power.
Specifically, when the first control voltage corresponding to each test power is obtained, if the test power currently tested is the maximum test power, the control voltage applied to the first-stage attenuation circuit 210 is adjusted to the initial voltage, and under the condition that the control voltage of the first-stage attenuation circuit 210 remains the initial voltage, the control voltage applied to the second-stage attenuation circuit 220 is adjusted to the target voltage, so that the microwave signal of the rated power output by the transmission link is transmitted.
It is understood that the voltage value of the initial voltage may be determined according to the circuit composition, the attenuation characteristic, the attenuation device model, and the attenuation device parameter of the first stage attenuation circuit 210, which is not particularly limited in this application. In one embodiment, the initial voltage may be a control voltage corresponding to the maximum attenuation amount when the first stage damping circuit 210 operates in the linear region, and when the first stage damping circuit 210 operates in the linear region, the attenuation amount thereof changes with the change of the control voltage, i.e., different control voltages correspond to different attenuation amounts. By setting the initial voltage as the control voltage corresponding to the maximum attenuation when the first stage attenuation circuit 210 operates in the linear region, as many adjustment regions as possible can be reserved in the linear region for subsequent adjustment.
If the currently tested test power is less than the maximum test power, the control voltage of the second-stage attenuator circuit 220 may be kept at the target voltage, and the control voltage applied to the first-stage attenuator circuit 210 is adjusted to the first control voltage, so that the transmitting link outputs the microwave signal with the rated power.
In one embodiment, the step of obtaining each test power comprises: and acquiring an adjustment step length and a test power range, and determining each test power according to the adjustment step length and the test power range. The test power range may include a maximum test power and a minimum test power, and it can be understood that the maximum test power, the minimum test power, and the adjustment step size may be determined according to practical applications, which is not specifically limited in the present application. In one example, the maximum test power may be 5dBm, the minimum test power may be-35 dBm, and the adjustment step size may be 1dB.
For the purpose of illustrating the aspects of the present application, a specific example will be described below. The calibration method is used for calibrating the transmitting link shown in fig. 5, and needs to acquire first control voltages corresponding to intermediate-frequency powers within a range from 5dBm to-35 dBm, wherein the adjustment step length is 1dbm, p1 is 5dbm, p2 is 4dbm, p3 is 3dBm, and so on.
In calibration, the output power of the IF source is set to P1 by the PC device, which communicates with the IF detection circuit 110 in the transmit chain to obtain the detection voltage VA1 at P1. The PC device sets the control voltage of the first attenuator ATT1 to VB1 through the control circuit 120 in the transmission link so that the attenuation amount of ATT1 is the maximum attenuation in the linear region. And the PC equipment adjusts the control voltage VC1 of the second attenuator ATT2, so that the output power of the whole machine is the rated power of the QPSK mode. At this time, the PC device acquires and records the control voltage VB1 of the first attenuator ATT 1. The PC equipment keeps VC1 unchanged, adjusts the output power of the intermediate frequency source to P2, P3 and P4 … … in sequence, and reads detection voltages VA2, VA3 and VA4 … corresponding to the intermediate frequency power respectively. Meanwhile, the PC equipment adjusts the control voltage of the first attenuator ATT1 to VB2, VB3 and VB4 … … in sequence, so that the output power of the whole machine is the rated power of the QPSK mode. The PC device records the adjustment of the control voltage of the first attenuator ATT1 to VB2, VB3, VB4 … … in sequence, and obtains the calibration data shown in the following table, and then stores the calibration data in the table into the digital transceiver.
Table 1 transmit power calibration table
After the calibration is completed, the corresponding relation between the input intermediate frequency power, the detection voltage and the first control voltage can be obtained, when the input intermediate frequency power of the transmitting link changes from 5dBm to-35 dBm, the MCU of the transmitting link can inquire the calibration table according to the current intermediate frequency detection voltage and obtain the corresponding first control voltage, and the first control voltage is applied to the first attenuator ATT1, so that automatic gain control can be realized, and the attenuation power of the first attenuator ATT1 is ensured to be unchanged.
It should be understood that, although the steps in the flowchart of fig. 6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 6 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In one embodiment, as shown in fig. 7, there is provided a transmit chain calibration apparatus, including:
the transmit chain in the above embodiments;
an intermediate frequency source, which is respectively connected to the intermediate frequency detection circuit 110 and the first stage attenuator circuit 210, and is configured to output an intermediate frequency signal;
the power meter is connected with the output port and used for receiving the microwave signal output by the transmitting link and measuring the microwave signal power of the microwave signal;
the PC device is connected to the if source, the power meter and the control circuit 120, respectively, for executing the steps of the above-mentioned transmit chain calibration method.
In one embodiment, a transmission link calibration apparatus is provided, which is applied in a PC device of the transmission link calibration apparatus, and includes: power acquisition module and test module, wherein:
the power acquisition module is used for acquiring each test power;
the test module is used for outputting a power control signal according to the test power for each test power, and the power control signal is used for indicating the intermediate frequency source to output an intermediate frequency signal of the test power; acquiring microwave signal power output by a power meter, and adjusting the control voltage applied to the first-stage attenuation circuit to a first control voltage according to the microwave signal power so as to enable the microwave signal power to be a rated power; and acquiring the detection voltage under the test power, generating a corresponding relation between the detection voltage and the first control voltage, and outputting the corresponding relation to the control circuit.
In one embodiment, a test module includes a first test unit and a second test unit. The first test unit is used for adjusting the control voltage applied to the first-stage attenuation circuit to an initial voltage and adjusting the control voltage applied to the second-stage attenuation circuit to a target voltage when the test power is equal to the maximum test power, so that the microwave signal power is the rated power. The second test unit is used for keeping the control voltage applied to the second-stage attenuation circuit as a target voltage and adjusting the control voltage applied to the first-stage attenuation circuit to the first control voltage when the test power is smaller than the maximum test power, so that the microwave signal power is the rated power.
In one embodiment, the initial voltage is a control voltage corresponding to the maximum attenuation amount when the first stage attenuation circuit operates in the linear region.
In one embodiment, the power obtaining module is configured to obtain an adjustment step size and a test power range, and determine each test power according to the adjustment step size and the test power range.
For specific definition of the transmit chain calibration apparatus, reference may be made to the above definition of the transmit chain calibration method, which is not described herein again. The various modules in the transmit chain calibration apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A transmit chain, comprising:
the monitoring unit comprises an intermediate frequency detection circuit and a control circuit which are connected in sequence; the intermediate frequency detection circuit is used for performing power detection on the received intermediate frequency signal to obtain an intermediate frequency detection voltage and outputting the intermediate frequency detection voltage to the control circuit; the control circuit is used for acquiring the corresponding relation between the detection voltage and the first control voltage and determining the first control voltage corresponding to the intermediate frequency detection voltage from the corresponding relation; the intermediate frequency detection voltage and the first control voltage are different voltages;
the intermediate frequency processing unit comprises a first-stage attenuation circuit connected with the control circuit; the first-stage attenuation circuit is used for receiving the intermediate frequency signal, determining the attenuation amount of the first-stage attenuation circuit according to the first control voltage, and attenuating the intermediate frequency signal based on the attenuation amount so that the signal power of the attenuated first attenuation signal is within a preset power range, and the first control voltage and the attenuation amount have a corresponding relation.
2. The transmit chain of claim 1, wherein the intermediate frequency processing unit further comprises a second stage attenuation circuit; the second-stage attenuation circuit is respectively connected with the first-stage attenuation circuit and the control circuit;
the control circuit is also used for outputting a second control voltage;
the second-stage attenuation circuit is used for attenuating the first attenuation signal according to the second control voltage and outputting a second attenuation signal obtained through attenuation.
3. The transmit chain of claim 2, further comprising an output port and a microwave processing unit, the microwave processing unit comprising a microwave signal processing circuit and a third stage attenuation circuit; the intermediate frequency processing unit also comprises a first up-conversion circuit;
the first up-conversion circuit is connected with the second-stage attenuation circuit and is used for up-converting the second attenuation signal and outputting a microwave signal obtained by frequency conversion;
the microwave signal processing circuit is connected with the first up-conversion circuit and is used for processing the microwave signal and outputting the processed microwave signal;
the control circuit is also used for outputting a third control voltage according to the output power fluctuation value;
the third-stage attenuation circuit is respectively connected with the output port, the microwave signal processing circuit and the control circuit, and is used for attenuating the processed microwave signal according to the third control voltage to obtain a third attenuation signal and outputting the third attenuation signal to the output port.
4. The transmit chain of any one of claims 1 to 3, wherein the control circuit comprises a microcontroller and a digital-to-analog converter; the microcontroller is respectively connected with the intermediate frequency detection circuit and the digital-to-analog converter, and the digital-to-analog converter is connected with the first-stage attenuation circuit.
5. A transmit chain calibration method, characterized in that the method is applied to a transmit chain calibration device, the transmit chain calibration device comprises an if source, a power meter and the transmit chain as claimed in claim 3, the if source is connected to the if detection circuit and the first stage attenuation circuit respectively, the power meter is connected to the output port; the method comprises the following steps:
obtaining each test power;
for each test power, outputting a power control signal according to the test power, wherein the power control signal is used for instructing the intermediate frequency source to output an intermediate frequency signal of the test power; acquiring the microwave signal power output by the power meter, and adjusting the control voltage applied to the first-stage attenuation circuit to a first control voltage according to the microwave signal power so as to enable the microwave signal power to be a rated power; and acquiring the detection voltage under the test power, generating a corresponding relation between the detection voltage and the first control voltage, and outputting the corresponding relation to the control circuit.
6. The transmit chain calibration method of claim 5, wherein the step of adjusting the control voltage applied to the first stage attenuator circuit to a first control voltage based on the microwave signal power comprises:
when the test power is equal to the maximum test power, adjusting the control voltage applied to the first-stage attenuation circuit to an initial voltage, and adjusting the control voltage applied to the second-stage attenuation circuit to a target voltage, so that the microwave signal power is the rated power;
when the test power is smaller than the maximum test power, the control voltage applied to the second-stage attenuation circuit is kept as the target voltage, and the control voltage applied to the first-stage attenuation circuit is adjusted to the first control voltage, so that the microwave signal power is the rated power.
7. The transmit chain calibration method of claim 6, wherein the initial voltage is a control voltage corresponding to a maximum attenuation when the first attenuation circuit operates in a linear region.
8. The transmit link calibration method according to any one of claims 5 to 7, wherein the step of obtaining each test power comprises:
and acquiring an adjustment step length and a test power range, and determining each test power according to the adjustment step length and the test power range.
9. A transmit chain calibration apparatus, comprising:
the transmit chain of any of claim 3;
the intermediate frequency source is respectively connected with the intermediate frequency detection circuit and the first-stage attenuation circuit and is used for outputting intermediate frequency signals;
the power meter is connected with the output port and used for receiving the microwave signal output by the transmitting link and measuring the microwave signal power of the microwave signal;
PC equipment, connected to the intermediate frequency source, the power meter and the control circuit, respectively, for performing the steps of the method according to any one of claims 5 to 8.
10. A digital transceiver, comprising: the transmit chain of any one of claims 1 to 4.
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