CN112118055B - Standing wave detection device and communication equipment - Google Patents
Standing wave detection device and communication equipment Download PDFInfo
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- CN112118055B CN112118055B CN201910482600.9A CN201910482600A CN112118055B CN 112118055 B CN112118055 B CN 112118055B CN 201910482600 A CN201910482600 A CN 201910482600A CN 112118055 B CN112118055 B CN 112118055B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
Abstract
The application discloses a standing wave detection device and communication equipment, wherein the standing wave detection device comprises a signal intensity detection circuit and a controller, wherein the signal intensity detection circuit is used for acquiring the forward power and the reverse power of a transmitter by using a receiving link of a receiver in a transmitting time slot so as to generate corresponding forward voltage and reverse voltage; the controller is connected with the signal strength detection circuit and used for receiving the forward voltage and the reverse voltage to obtain the voltage standing wave ratio of the antenna, judging whether to adjust the transmitting power of the transmitter according to the voltage standing wave ratio of the antenna, and adjusting the transmitting power of the transmitter by adjusting the control voltage value input to the transmitter if the transmitting power of the transmitter is adjusted. By the mode, the forward power and the reverse power can be detected by using the receiving link of the receiver in the transmitting time slot, then standing wave detection is carried out, the detection precision is improved, and the hardware cost is saved.
Description
Technical Field
The application relates to the technical field of communication, in particular to a standing wave detection device and communication equipment.
Background
In a radio frequency transmission link of a communication device, particularly a high-power transmission circuit, in order to protect a radio frequency power amplifier tube from being damaged by a reflected radio frequency signal and shorten the service life, a Voltage Standing Wave Ratio (VSWR) detection circuit is usually reserved between a final-stage power amplifier tube and an antenna port to monitor Standing waves in real time, and when the Standing waves are too large and the reflected signals exceed the standard, the protection is performed by adopting a power reduction or power cut-off mode; therefore, the standing wave detection and protection mechanism plays a crucial role in the service life of the power amplifier tube.
The inventor of the application finds that standing wave detection can be carried out on a predistortion feedback link of high-power communication equipment in the existing practical application, but the method is only suitable for a system for carrying out Digital Predistortion (DPD) calibration on a power amplifier, and a single carrier Digital trunking communication (DMR) product does not need DPD calibration, so that a feedback channel is not added; in addition, in the conventional stand standing wave detection mode of the DMR, three operational amplifiers and two detection tubes are adopted to realize the detection of transmitted forward power, reverse power and standing wave, and the defects of more devices, large layout space and higher cost are caused; due to the difference between the frequency band and the Printed Circuit Board (PCB) design, each machine type requires a large debugging workload.
Disclosure of Invention
The main problem of solving of this application is to provide a standing wave detection device and communication equipment, can utilize the receiving link of receiver to carry out forward power and reverse power detection at the transmission time slot, then carry out standing wave detection, improve and detect the precision, save the hardware cost.
In order to solve the above technical problem, the present application adopts a technical solution of providing a standing wave detection apparatus, which includes a signal strength detection circuit and a controller, wherein the signal strength detection circuit is configured to obtain a forward power and a reverse power of a transmitter by using a receiving link of a receiver in a transmission timeslot to generate a corresponding forward voltage and a corresponding reverse voltage; the controller is connected with the signal strength detection circuit and used for receiving the forward voltage and the reverse voltage to obtain the voltage standing wave ratio of the antenna, judging whether the transmitting power of the transmitter is adjusted or not according to the voltage standing wave ratio of the antenna, and if so, adjusting the control voltage value input to the transmitter to adjust the transmitting power of the transmitter.
In order to solve the above technical problem, another technical solution adopted by the present application is to provide a communication device, including: the first switch is respectively connected with the transmitter, the receiver and the antenna and is used for conducting the transmitter and the antenna in a transmitting time slot or conducting the receiver and the antenna in a receiving time slot; the standing wave detection device is respectively connected with the receiver and the transmitter and is used for acquiring the voltage standing wave ratio of the antenna by using a receiving link of the receiver in a transmitting time slot and adjusting the transmitting power of the transmitter according to the voltage standing wave ratio; the second switch is respectively connected with the transmitter, the receiver and the standing wave detection device and is used for conducting the transmitter and the standing wave detection device; the standing wave detection device comprises a signal intensity detection circuit and a controller, wherein the signal intensity detection circuit is used for acquiring the forward power and the reverse power of a transmitter by using a receiving link of a receiver in a transmitting time slot so as to generate corresponding forward voltage and reverse voltage; the controller is connected with the signal strength detection circuit and used for receiving the forward voltage and the reverse voltage to obtain the voltage standing wave ratio of the antenna, judging whether the transmitting power of the transmitter is adjusted or not according to the voltage standing wave ratio of the antenna, and if so, adjusting the control voltage value input to the transmitter to adjust the transmitting power of the transmitter.
Through the scheme, the beneficial effects of the application are that: the signal strength detection circuit in the transmitting time slot utilizes a receiving link of a receiver to obtain a forward voltage and a reverse voltage corresponding to an output signal of a transmitter; the controller receives the forward voltage and the reverse voltage, calculates the voltage standing wave ratio of the antenna, judges whether the transmitting power of the transmitter needs to be adjusted according to the voltage standing wave ratio, adjusts the control voltage value input to the transmitter if the transmitting power of the transmitter needs to be adjusted, changes the transmitting power of the transmitter, detects the forward power and the reverse power by utilizing a receiving link of the receiver in a transmitting time slot, then detects the standing wave, improves the detection precision of the voltage standing wave ratio, and saves the hardware cost due to the multiplexing of the receiving link.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of a standing wave detection apparatus provided in the present application;
fig. 2 is a schematic structural diagram of an embodiment of a communication device provided in the present application;
fig. 3 is a schematic structural diagram of another embodiment of the communication device provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a standing wave detection device provided in the present application, where the standing wave detection device includes: a signal strength detection circuit 11 and a controller 12.
The signal strength detecting circuit 11 is used for acquiring the forward power and the reverse power of a transmitter (not shown in the figure) by using a receiving link of a receiver (not shown in the figure) in a transmitting time slot to generate corresponding forward voltage and reverse voltage.
The signal strength detecting circuit 11 works in a transmitting time slot of the transmitter, in the transmitting time slot, the transmitter sends out a radio frequency signal through an antenna (not shown in the figure), the receiver does not receive the radio frequency signal, and the signal strength detecting circuit 11 may use a receiving link of the receiver to obtain the power of the signal sent by the transmitter and convert the power into a voltage value.
The controller 12 is connected to the signal strength detection circuit 11, and is configured to receive the forward voltage and the reverse voltage to obtain a voltage standing wave ratio of the antenna, determine whether to adjust the transmission power of the transmitter according to the voltage standing wave ratio of the antenna, and adjust a control voltage value input to the transmitter to adjust the transmission power of the transmitter if the transmission power of the transmitter needs to be adjusted.
The working principle of the voltage standing wave ratio detection is that forward power and reverse power are obtained firstly, and then the voltage standing wave ratio VSWR is calculated according to the following formula:
VSWR＝(1+Γ)/(1-Γ)
wherein Γ is a reflection coefficient, which is proportional to the ratio of the reverse voltage to the forward voltage.
According to the obtained forward voltage and the reverse voltage, the controller 12 can obtain the voltage standing wave ratio of the antenna through calculation, and judge whether the transmitting power of the transmitter needs to be adjusted according to the voltage standing wave ratio, if the transmitting power of the transmitter does not need to be adjusted, the controller 12 can keep the output control voltage value unchanged, if the judging result is that the transmitting power of the transmitter needs to be adjusted, the controller 12 can adjust the transmitting power of the transmitter through adjusting the output control voltage value, so that the transmitting power of the transmitter can be adjusted according to specific requirements to adapt to the current transmitting environment.
The signal strength detection circuit 11 in the transmission time slot utilizes the receiving link of the receiver to obtain the forward voltage and the reverse voltage corresponding to the output signal of the transmitter; the controller 12 receives the forward voltage and the reverse voltage, calculates the voltage standing wave ratio of the antenna, judges whether the transmitting power of the transmitter needs to be adjusted according to the voltage standing wave ratio, adjusts the transmitting power of the transmitter by adjusting the control voltage value input to the transmitter if the transmitting power of the transmitter needs to be adjusted, and detects the forward power and the reverse power by using the receiving link of the receiver in the transmitting time slot, and then detects the standing wave, so that the detection precision of the voltage standing wave ratio is improved.
With continued reference to fig. 1, the controller 12 includes a vswr calculation and determination circuit 121, a power adjustment circuit 122, and a power monitoring circuit 123.
The voltage standing wave ratio calculating and judging circuit 121 is connected to the signal strength detecting circuit 11, and is configured to receive the forward voltage and the reverse voltage, calculate a voltage standing wave ratio, judge whether the voltage standing wave ratio is greater than a preset voltage standing wave ratio, and send a power adjusting instruction to the power adjusting circuit 122 if the calculated voltage standing wave ratio is greater than the preset voltage standing wave ratio.
The power adjusting circuit 122 is connected to an input terminal of a power amplifier of the transmitter, and is configured to adjust a control voltage value input to the power amplifier to a preset voltage value after receiving a power adjusting instruction, where the control voltage value is greater than the preset voltage value.
When the power adjusting circuit 122 receives the power adjusting instruction, it indicates that the current voltage standing wave ratio obtained by the voltage standing wave ratio calculating and judging circuit 121 is greater than the preset voltage standing wave ratio, and the current reflected power is greater, which is not beneficial to the transmission of the radio frequency signal, and the transmission power of the radio frequency signal can be reduced, so as to reduce the reflected power and reduce the voltage standing wave ratio.
Further, the power amplifier of the transmitter includes at least one transistor, and the output terminal of the power adjusting circuit 122 is connected to the input terminal of the transistor, and is used for outputting a control voltage value to control the output power of the transistor; in one embodiment, the transistor is a field effect transistor, and the output terminal of the power adjusting circuit 122 is connected to the gate of the field effect transistor to control the gate voltage of the field effect transistor, so as to adjust the output power of the power amplifier by adjusting the control voltage value.
The power monitoring circuit 123 is connected to the signal strength detecting circuit 11 and the power adjusting circuit 122, and is configured to obtain a forward voltage output by the signal strength detecting circuit 11 to generate a forward power, and determine whether the forward power is greater than a preset power, and if the forward power is greater than the preset power, send a power adjusting instruction to the power adjusting circuit 122.
The power monitoring circuit 123 is used to determine whether the acquired forward power exceeds the preset power, and when the acquired forward power is greater than the preset power, the power monitoring circuit 123 sends a power adjustment instruction to the power adjustment circuit 122, so that the power adjustment circuit 122 adjusts the control voltage value input to the power amplifier of the transmitter, so as to change the transmitting power of the transmitter.
Whether the transmitting power of the transmitter and the current voltage standing wave ratio are within a normal range or not is detected through the voltage standing wave ratio calculating and judging circuit 121, the power adjusting circuit 122 and the power monitoring circuit 123, if the transmitting power and the current voltage standing wave ratio exceed the normal range, the output power of a power amplifier of the transmitter is controlled through the power adjusting circuit 122, and therefore the transmitting power of the transmitter is controlled, the reflection power of radio frequency signals is reduced, the safety of the transmitter is improved, and the circuit is prevented from being damaged due to overlarge power.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a communication device provided in the present application, where the communication device includes: an antenna 21, a transmitter 22, a receiver 23, a first switch 24, a standing wave detection device 25, and a second switch 26.
The antenna 21 is used for transmitting or receiving radio frequency signals.
The transmitter 22 is connected to the antenna 21 and configured to generate a radio frequency signal and transmit the radio frequency signal through the antenna 21.
The receiver 23 is connected to the antenna 21, and configured to receive the radio frequency signal and process the radio frequency signal to obtain a baseband signal;
the first switch 24 is connected to the antenna 21, the transmitter 22 and the receiver 23, respectively, and is used for conducting the transmitter 22 and the antenna 21 in a transmission time slot or conducting the receiver 23 and the antenna 21 in a reception time slot.
In this embodiment, in order to obtain the forward power and the reverse power by using the receiving link 231 of the receiver 23 during the transmitting time slot, the transmitter 22 and the receiver 23 share one antenna 21, and the transmitter 22 and the receiver 23 cannot be in the working state at the same time; in other embodiments, when the transmitter 22 and the receiver 23 are connected to one antenna 21, respectively, the first switch 24 may be connected to only the receiver 23, and the first switch 24 is controlled to be in an off state during the transmission time slot, so as to prevent the receiver 23 from receiving the radio frequency signal during the transmission time slot.
The standing wave detection device 25 is respectively connected to the transmitter 22 and the receiver 23, and is configured to obtain the voltage standing wave ratio of the antenna 21 during the transmission time slot by using the receiving link 231 of the receiver 23, and adjust the transmission power of the transmitter 22 according to the voltage standing wave ratio.
The second switch 26 is connected to the transmitter 22, the receiver 23 and the standing wave detection device 25 respectively, for connecting the transmitter 22 and the standing wave detection device 25, so that the standing wave detection device 25 can receive the signal from the transmitter 22 through the receiving link 231, and the receiver 23 does not receive the rf signal.
The standing wave detection device 25 comprises a signal strength detection circuit 251 and a controller 252, wherein the signal strength detection circuit 251 is connected with the receiving link 231, and the signal strength detection circuit 251 is used for acquiring the forward power and the reverse power of the transmitter 22 by using the receiving link 231 of the receiver 23 in a transmitting time slot so as to generate corresponding forward voltage and reverse voltage; the controller 252 is connected to the signal strength detecting circuit 251, and is configured to receive the forward voltage and the reverse voltage to obtain the voltage standing wave ratio of the antenna 21, determine whether to adjust the transmitting power of the transmitter 22 according to the voltage standing wave ratio of the antenna 21, and adjust the control voltage value input to the transmitter 22 to adjust the transmitting power of the transmitter 22 if the transmitting power of the transmitter 22 needs to be adjusted.
The transmitter 22 and the antenna 21 are connected through the first switch 24, and the signal strength detection circuit 251 acquires the forward voltage and the reverse voltage corresponding to the output signal of the transmitter 22 through the receiving link 231 in the transmission time slot of the transmitter 22; the controller 252 calculates the voltage standing wave ratio of the antenna 21 according to the forward voltage and the reverse voltage, adjusts the control voltage value input to the transmitter 22 to adjust the transmission power of the transmitter 22 when it is determined that the transmission power of the transmitter 22 needs to be adjusted according to the voltage standing wave ratio, so that the transmission power of the transmitter 22 is changed, and performs forward power and reverse power detection by using the receiving link 231 of the receiver 23 at the transmission time slot, and then performs standing wave detection, thereby improving the detection accuracy and saving the hardware cost.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of a communication device provided in the present application, where the communication device includes: an antenna 31, a transmitter 32, a receiver 33, a first switch 34, a standing wave detection device 35, and a second switch 36.
The first switch 34 is an alternative switch, a first end of the first switch 34 is connected with the antenna 31, a second end is connected with the output end of the transmitter 32, and a third end is connected with the input end of the receiver 33; when the first terminal is connected to the second terminal, the antenna 31 is used for transmitting the radio frequency signal generated by the transmitter 32, and when the first terminal is connected to the third terminal, the antenna 31 is used for receiving the radio frequency signal.
The transmitter 32 includes a signal generation and modulation circuit 321, a power amplifier 322, and a bidirectional coupler 323, which are connected in this order.
The signal generating and modulating circuit 321 is configured to generate a baseband signal, modulate the baseband signal into a radio frequency signal, modulate a carrier signal with the baseband signal to form a passband signal, move the passband signal to a desired frequency band to form a radio frequency signal, and transmit the radio frequency signal with sufficient power.
The power amplifier 322 is configured to amplify a received rf signal, and the bidirectional coupler 323 is configured to couple an input amplified rf signal, couple out a portion of the rf signal to generate a forward rf signal and a reverse rf signal, and transmit the forward rf signal and the reverse rf signal to the receiving link 331.
Further, the transmitter 32 further includes a first signal attenuator 324 and a second signal attenuator 325, an input end of the bidirectional coupler 323 is connected to an output end of the power amplifier 322, a through end of the bidirectional coupler 323 is connected to a second end of the first switch 34, a first coupling end of the bidirectional coupler 323 is connected to the first signal attenuator 324, the first coupling end of the bidirectional coupler 323 is a co-directional coupling end, the second coupling end of the bidirectional coupler 323 is connected to the second signal attenuator 325, the second coupling end of the bidirectional coupler 323 is a reverse coupling end, the bidirectional coupler 323 is configured to send the forward rf signal and the reverse rf signal to the first signal attenuator 324 and the second signal attenuator 325, and the first signal attenuator 324 and the second signal attenuator 325 are configured to attenuate the forward rf signal and the reverse rf signal output by the bidirectional coupler 323.
The receiver 33 includes a receiving chain 331 and a low noise amplifier 332, the receiving chain 331 includes at least a demodulation circuit (not shown in the figure), an input end of the low noise amplifier 332 is connected to a third end of the first switch 34, an output end of the low noise amplifier 332 is connected to a second end of the second switch 36, the low noise amplifier 332 is configured to amplify the received radio frequency signal, the second switch 36 is a one-of-three radio frequency switch, a third end and a fourth end of the second switch 36 are respectively connected to the first signal attenuator 324 and the second signal attenuator 325, a first end of the second switch 36 is connected to a demodulation circuit, and the demodulation circuit is configured to demodulate the obtained signal to obtain a demodulated signal.
Further, when the first terminal of the second switch 36 is connected to the second terminal of the second switch 36, the demodulation circuit is configured to demodulate the amplified radio frequency signal output by the low noise amplifier 332 to obtain a baseband signal, wherein the signal strength detection circuit 351 is in an off state; when the first terminal of the second switch 36 is connected to the third terminal of the second switch 36, the demodulation circuit is configured to demodulate the signal output by the first signal attenuator 324 to obtain a forward signal, and the signal strength detection circuit 351 outputs a forward voltage according to the forward signal; when the first terminal of the second switch 36 is connected to the fourth terminal of the second switch 36, the demodulation circuit is configured to demodulate the signal output by the second signal attenuator 325 to obtain an inverted signal, and the signal strength detection circuit 351 outputs an inverted voltage according to the inverted signal.
The controller 352 includes a voltage standing wave ratio calculating and judging circuit 3521, a power adjusting circuit 3522 and a power monitoring circuit 3523, wherein the voltage standing wave ratio calculating and judging circuit 3521 is connected to the signal strength detecting circuit 351 and is configured to receive the forward voltage and the reverse voltage, calculate a voltage standing wave ratio, judge whether the voltage standing wave ratio is greater than a preset voltage standing wave ratio, send a power adjusting instruction to the power adjusting circuit 3522 if the voltage standing wave ratio is greater than the preset voltage standing wave ratio, and also send a warning to remind a user that the current voltage standing wave ratio is too large, for example, the voltage standing wave ratio calculating and judging circuit 3521 may be connected to a speaker (not shown in the figure), and when the voltage standing wave ratio is too large, output a voltage to the speaker, so that the speaker sends a warning sound; the power adjusting circuit 3522 is connected to an input terminal of the power amplifier 322 of the transmitter 32, and is configured to adjust a control voltage value input to the power amplifier 322 to a preset voltage value after receiving a power adjusting command, where the control voltage value is greater than the preset voltage value.
The power monitoring circuit 3523 is connected to the signal strength detecting circuit 351 and the power adjusting circuit 3522, and is configured to obtain a forward voltage output by the signal strength detecting circuit 351 to generate a forward power, and determine whether the forward power is greater than a preset power, and if the forward power is greater than the preset power, send a power adjusting instruction to the power adjusting circuit 3522.
In the transmission timeslot, the first terminal and the second terminal of the first switch 34 are connected, the signal generating and modulating circuit 321 generates a radio frequency signal, the power amplifier 322 amplifies the radio frequency signal, the bidirectional coupler 323 couples the amplified radio frequency signal, a part of the radio frequency signal is output from the through terminal of the bidirectional coupler 323, a part of the radio frequency signal (forward radio frequency signal) is output from the first coupling terminal, another part of the radio frequency signal (reverse radio frequency signal) is output from the second coupling terminal, the first signal attenuator 324 attenuates the forward radio frequency signal to obtain a forward radio frequency signal with reduced power, and the second signal attenuator 325 attenuates the reverse radio frequency signal to obtain a reverse radio frequency signal with reduced power.
In a specific embodiment, the first terminal of the second switch 36 is connected to the third terminal or the fourth terminal, and the first terminal of the second switch 36 is connected to the third terminal and then to the fourth terminal, that is, the first terminal receives the signal output by the first signal attenuator 324 and then receives the signal output by the second signal attenuator 325, and the demodulation circuit demodulates the received signal, so as to obtain the forward signal and the reverse signal.
After the signal strength detection circuit 351 acquires the forward signal and the reverse signal, it detects the forward power and the reverse power corresponding to the forward signal and the reverse signal, and outputs a forward voltage and a reverse voltage to the controller 352, and the controller 352 adjusts the control voltage value input to the power amplifier 322 as needed.
In the receiving time slot of the receiver 33, the first end of the first switch 34 is connected to the third end, the antenna 31 receives the radio frequency signal, the radio frequency signal enters the low noise amplifier 332, the low noise amplifier 332 amplifies the radio frequency signal, and the amplified radio frequency signal is transmitted to the demodulation circuit for processing, so that a baseband signal is obtained, and at this time, the standing wave detection device 35 is in an off state, and the reception of the radio frequency signal is not affected.
Since the receiver 33 is connected to the second switch 36 after the low noise amplifier 332, it is necessary to evaluate whether the performance index of the receiver 33 changes after the second switch 36 is introduced, and to test the sensitivity and intermodulation interference index in the case of no second switch 36 and the case of setting the second switch 36, in a specific embodiment, the frequencies L, M and H are 400.075MHz, 435.075MHz and 469.075MHz, respectively, to obtain the test data shown in the following table:
it can be seen from the above table that the difference loss caused by the second switch 36 is less than 0.7dB, and the second switch 36 is located after the low noise amplifier 332, so that theoretically the degradation of the receiving link 331 is negligible, and there is substantially no influence on the sensitivity and intermodulation interference, so that the second switch 36 can be added.
Since the DMR is in a Time Division Duplex (TDD) mode, a transmission signal occupies one Time slot, a reception signal occupies one Time slot, the receive chain 331 after the low noise amplifier 332 may be multiplexed for forward and reverse power detection in the transmit time slot, for standing wave detection, protection and alarm measures, a three-out-of-one rf switch is added after the low noise amplifier 332 to switch the receiving rf signal, the forward signal and the reverse signal, the signal strength detection circuit 351 is used to obtain the forward power and the reverse power, and then sent to the controller 352, and the controller 352 calculates the voltage standing wave ratio, and when the voltage standing wave ratio is higher than the set threshold value, the controller 352 may reduce the input voltage to the power amplifier 322, thereby reducing the output power of the power amplifier 322, the power amplifier 322 is protected in real time, and the alarm prompts the user that the voltage standing wave ratio of the antenna 31 is abnormal when the voltage standing wave ratio is too large.
In a specific embodiment, a test is performed on the DMR bench, the low noise amplifier 332 is disconnected from the receiving link 331, the second switch 36 is connected, the forward rf signal and the reverse rf signal are introduced to the first end of the second switch 36, and the signal strength detection circuit 351 is used to detect the forward power and the reverse power of the transmitter 32, so as to obtain the vswr as shown in the following table:
in the prior art, each frequency point needs to be tested repeatedly, a fitting calibration factor K is evaluated, and when the frequency is 400MHz, the K is 1.6; when the frequency is 435MHz, K is 1.4; when the frequency is 470MHz, K is 1.05; it can be seen from the above table that the error of the detection value in the embodiment is within ± 0.2, whereas the error of ± 0.2 can be ensured only by multiplying the original detection value by the calibration factor K when the original detection value is more than ± 0.5 in the prior art, so that the detection accuracy in the embodiment is significantly improved compared with the prior art.
The embodiment has advantages in cost control, layout space and detection precision, saves hardware cost, PCB layout space and debugging workload, can accurately detect the voltage standing wave ratio of the current antenna 31, performs protection measures for reducing power or turning off the power amplifier 322, and reduces damage of the transmission signal to the power amplifier 322.
The above are only examples of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (9)
1. A standing wave detection device, comprising:
the signal strength detection circuit is used for acquiring the forward power and the reverse power of the transmitter by using a receiving link of the receiver in a transmitting time slot so as to generate corresponding forward voltage and reverse voltage;
the controller is connected with the signal strength detection circuit and used for receiving the forward voltage and the reverse voltage so as to obtain the voltage standing wave ratio of the antenna and judging whether to adjust the transmitting power of the transmitter according to the voltage standing wave ratio of the antenna, if so, the controller adjusts the control voltage value input to the transmitter so as to adjust the transmitting power of the transmitter;
the controller comprises a power adjusting circuit and a power monitoring circuit, wherein the power monitoring circuit is respectively connected with the signal strength detecting circuit and the power adjusting circuit and is used for acquiring the forward voltage output by the signal strength detecting circuit so as to generate the forward power and judging whether the forward power is greater than the preset power, and if so, sending a power adjusting instruction to the power adjusting circuit; the power adjusting circuit is connected with an input end of a power amplifier of the transmitter and used for adjusting the control voltage value input to the power amplifier to a preset voltage value after receiving the power adjusting instruction, wherein the control voltage value is larger than the preset voltage value.
2. The standing wave detection device according to claim 1,
the controller also comprises a voltage standing wave ratio calculating and judging circuit, wherein the voltage standing wave ratio calculating and judging circuit is connected with the signal intensity detecting circuit and is used for receiving the forward voltage and the reverse voltage, calculating the voltage standing wave ratio, judging whether the voltage standing wave ratio is greater than a preset voltage standing wave ratio or not, and if so, sending a power adjusting instruction to the power adjusting circuit.
3. The standing wave detection device according to claim 2,
the power amplifier of the transmitter at least comprises a transistor, and the output end of the power adjusting circuit is connected with the input end of the transistor and used for outputting the control voltage value to control the output power of the transistor.
4. A communication device, comprising:
the first switch is respectively connected with the transmitter, the receiver and the antenna and is used for conducting the transmitter and the antenna in a transmitting time slot or conducting the receiver and the antenna in a receiving time slot;
the standing wave detection device is respectively connected with the receiver and the transmitter and is used for acquiring the voltage standing wave ratio of the antenna by using a receiving link of the receiver in a transmitting time slot and adjusting the transmitting power of the transmitter according to the voltage standing wave ratio;
a second switch, connected to the transmitter, the receiver and the standing wave detection device, respectively, for conducting the transmitter and the standing wave detection device;
the standing wave detection device comprises a signal strength detection circuit and a controller, wherein the signal strength detection circuit is used for acquiring the forward power and the reverse power of the transmitter by using a receiving link of a receiver in a transmitting time slot so as to generate corresponding forward voltage and reverse voltage; the controller is connected with the signal strength detection circuit and used for receiving the forward voltage and the reverse voltage to obtain a voltage standing wave ratio of the antenna, judging whether to adjust the transmitting power of the transmitter according to the voltage standing wave ratio of the antenna, and if so, adjusting a control voltage value input to the transmitter to adjust the transmitting power of the transmitter;
the controller comprises a power adjusting circuit and a power monitoring circuit, wherein the power monitoring circuit is respectively connected with the signal strength detecting circuit and the power adjusting circuit and is used for acquiring the forward voltage output by the signal strength detecting circuit to generate the forward power and judging whether the forward power is greater than the preset power, and if so, sending a power adjusting instruction to the power adjusting circuit; the power adjusting circuit is connected with an input end of a power amplifier of the transmitter and used for adjusting the control voltage value input into the power amplifier to be a preset voltage value after receiving the power adjusting instruction, wherein the control voltage value is larger than the preset voltage value.
5. The communication device of claim 4,
the transmitter comprises a signal generating and modulating circuit, a power amplifier and a bidirectional coupler which are sequentially connected, wherein the signal generating and modulating circuit is used for generating a baseband signal and modulating the baseband signal into a radio frequency signal, the power amplifier is used for amplifying the radio frequency signal, and the bidirectional coupler is used for generating a forward radio frequency signal and a reverse radio frequency signal and transmitting the forward radio frequency signal and the reverse radio frequency signal to the receiving link.
6. The communication device of claim 5,
the transmitter further comprises a first signal attenuator and a second signal attenuator, an input end of the bidirectional coupler is connected with an output end of the power amplifier, a through end of the bidirectional coupler is connected with a second end of the first switch, a first coupling end of the bidirectional coupler is connected with the first signal attenuator, a second coupling end of the bidirectional coupler is connected with the second signal attenuator, the bidirectional coupler is used for sending the forward radio-frequency signal and the reverse radio-frequency signal to the first signal attenuator and the second signal attenuator respectively, and the first signal attenuator and the second signal attenuator are used for attenuating the forward radio-frequency signal and the reverse radio-frequency signal output by the bidirectional coupler respectively.
7. The communication device of claim 6,
the receiver comprises a low noise amplifier and the receiving link, the receiving link at least comprises a demodulation circuit, the input end of the low noise amplifier is connected with the third end of the first switch, the output end of the low noise amplifier is connected with the second end of the second switch, the low noise amplifier is used for amplifying the received radio frequency signal, the third end and the fourth end of the second switch are respectively connected with the first signal attenuator and the second signal attenuator, the first end of the second switch is connected with the demodulation circuit, and the demodulation circuit is used for demodulating the acquired signal to obtain a demodulated signal.
8. The communication device of claim 7,
when the first end of the second switch is connected to the second end of the second switch, the demodulation circuit is configured to demodulate the amplified radio frequency signal output by the low noise amplifier to obtain the baseband signal, where the signal strength detection circuit is in an off state; when the first end of the second switch is connected with the third end of the second switch, the demodulation circuit is used for demodulating the signal output by the first signal attenuator to obtain a forward signal, and the signal strength detection circuit outputs the forward voltage according to the forward signal; when the first end of the second switch is connected with the fourth end of the second switch, the demodulation circuit is used for demodulating the signal output by the second signal attenuator to obtain a reverse signal, and the signal strength detection circuit outputs the reverse voltage according to the reverse signal.
9. The communication device of claim 8,
the controller also comprises a voltage standing wave ratio calculating and judging circuit, wherein the voltage standing wave ratio calculating and judging circuit is connected with the signal intensity detecting circuit and is used for receiving the forward voltage and the reverse voltage, calculating the voltage standing wave ratio, judging whether the voltage standing wave ratio is greater than a preset voltage standing wave ratio or not, and if so, sending a power adjusting instruction to the power adjusting circuit.
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| CN114640560B (en) * | 2022-03-29 | 2024-03-08 | Oppo广东移动通信有限公司 | Signal processing method and device, baseband device and terminal equipment |
| CN115051763B (en) * | 2022-06-16 | 2024-01-12 | 维沃移动通信有限公司 | Measuring method and measuring device for voltage standing wave ratio and electronic equipment |
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