WO2018000670A1 - Method and device for detecting local oscillation signal - Google Patents

Method and device for detecting local oscillation signal Download PDF

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Publication number
WO2018000670A1
WO2018000670A1 PCT/CN2016/103494 CN2016103494W WO2018000670A1 WO 2018000670 A1 WO2018000670 A1 WO 2018000670A1 CN 2016103494 W CN2016103494 W CN 2016103494W WO 2018000670 A1 WO2018000670 A1 WO 2018000670A1
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Prior art keywords
signal
local oscillator
analog
circuit
frequency
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PCT/CN2016/103494
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French (fr)
Chinese (zh)
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林志滨
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中兴通讯股份有限公司
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Publication of WO2018000670A1 publication Critical patent/WO2018000670A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters

Definitions

  • the present disclosure relates to the field of wireless communications, for example, to a method and apparatus for detecting a local oscillator leakage signal.
  • the transmission signal is usually required to have a large bandwidth and a high linearity, which places high demands on the spurious and linear indicators of the wireless communication system.
  • a transmit signal is transmitted through a transmit link.
  • the upconversion module in the transmit link typically uses quadrature modulation to achieve upconversion, due to devices such as modulation in the upconversion module.
  • the inherent DC offset of the device itself causes an unwanted signal such as a local oscillator leakage signal during the up-conversion process, and the local oscillator leakage signal causes the spurious index to not meet the relevant standard and directly affects the linearity of the system. Vibration leakage is very necessary.
  • the LO leakage is usually reduced by detecting and calibrating the LO leakage power, and the LO leakage power will drift with the frequency, temperature and time. Therefore, if the LO leakage power is to be eliminated, it is generally required at a specific temperature and time.
  • the local oscillator leakage power is detected and calibrated.
  • the transmitting link 2 and the feedback link 4 are connected to the same local oscillator (abbreviated as local oscillator) 1, and the feedback link 4 is designed to be AC-coupled, so that the transmitting The local oscillator leakage signal generated by the link 2 passes through the feedback link 4 and becomes a zero-frequency signal.
  • the processor 5 such as a Field Programmable Gate Array (FPGA), cannot detect the feedback link 4 Local oscillator leakage power.
  • FPGA Field Programmable Gate Array
  • an independent local oscillator needs to be added to the feedback link 4, or as shown in FIG. 2, a secondary local oscillator 7 and an RF switch 8 are added, and the RF switch 8 is used for selection.
  • the processor 5 can detect the local oscillator leakage power in the feedback link 4.
  • the embodiments of the present disclosure provide a method and a device for detecting a local oscillator leakage signal, which solve the technical problems existing in the related art, can reduce the cost, and simplify the design of the feedback link.
  • an embodiment of the present disclosure provides a device for detecting a local oscillator leakage signal, the device comprising: a local oscillator, a transmit link, a radio frequency power amplifier, a feedback link, and a processor, where
  • the local oscillator is configured to generate a local oscillator signal and transmit the local oscillator signal to the transmit link;
  • the transmitting link is configured to acquire a first signal, upconvert the first signal according to the received local oscillator signal to obtain a second signal, and send the second signal to the radio frequency power amplifier.
  • the second signal includes the up-converted first signal and the local oscillator leakage signal;
  • the radio frequency power amplifier is configured to receive and amplify the second signal, acquire an intermodulation signal generated when the second signal is amplified, select a third signal from the intermodulation signal, and select the third signal Sent to the feedback link;
  • the feedback link is configured to receive the third signal, process the third signal, and send the processed third signal to the processor
  • the processor is configured to receive the processed third signal and detect the power of the processed third signal.
  • the transmitting link includes: a digital to analog conversion circuit, a first intermediate frequency filtering circuit, and a modulation circuit, where
  • the digital-to-analog conversion circuit is configured to acquire an analog signal, and send the analog signal to the first intermediate frequency filter circuit;
  • the first intermediate frequency filter circuit is configured to receive the analog signal, filter the analog signal to obtain a first signal, and send the first signal to the modulation circuit;
  • the modulating circuit is configured to receive the first signal and a local oscillator signal sent by the local oscillator, and upconvert the first signal according to the local oscillator signal to obtain a second signal, and Two signals are sent to the RF power amplifier.
  • the feedback link includes: a small signal amplifying circuit, a demodulating circuit, a second intermediate frequency filtering circuit, and an analog to digital conversion circuit, wherein
  • the small signal amplifying circuit is configured to receive a third signal sent by the radio frequency power amplifier, amplify the third signal, and send the amplified third signal to the demodulation circuit;
  • the demodulation circuit is configured to receive the amplified third signal, and to perform the amplified third
  • the frequency of the signal is down-converted to a preset frequency, and the down-converted third signal is sent to the second intermediate frequency filter circuit;
  • the second intermediate frequency filter circuit is configured to receive the down-converted third signal, filter the down-converted third signal, and send the filtered third signal to the analog-to-digital conversion circuit;
  • the analog-to-digital conversion circuit is configured to receive the filtered third signal, perform analog-to-digital conversion on the filtered third signal, and send the analog-to-digital converted third signal to the processor.
  • the third signal is a third-order intermodulation signal.
  • the processor is configured to adjust an offset compensation voltage of the digital-to-analog conversion circuit until the third signal is detected when the power of the third signal is detected to be greater than a preset threshold The power is not greater than the preset threshold.
  • an embodiment of the present disclosure provides a method for detecting a local oscillation leakage signal, where the method includes:
  • Obtaining a first signal performing upconversion of the first signal according to the generated local oscillator signal to obtain a second signal, where the second signal includes the upconverted first signal and a local oscillator leakage signal;
  • Amplifying the second signal acquiring an intermodulation signal generated when the second signal is amplified, selecting a third signal from the intermodulation signal, processing the third signal, and detecting the processed third signal Power.
  • the acquiring the first signal, and upconverting the first signal according to the generated local oscillator signal to obtain the second signal including:
  • the first signal is upconverted according to the generated local oscillator signal to obtain a second signal.
  • processing the third signal includes:
  • Analog-to-digital conversion is performed on the filtered third signal.
  • the third signal is a third-order intermodulation signal.
  • the method further includes:
  • Embodiments of the present disclosure provide a method and apparatus for detecting a local oscillation leakage signal, the detection apparatus including: a local oscillator, a transmission link, a radio frequency power amplifier, a feedback link, and a processor.
  • the local oscillator Generating a local oscillator signal and transmitting the local oscillator signal to the transmit link; then, the transmit link acquires a first signal, and upconverting the first signal according to the received local oscillator signal to obtain a Transmitting the second signal to the radio frequency power amplifier; the radio frequency power amplifier acquires an intermodulation signal generated when the second signal is amplified, and selects a third signal from the intermodulation signal, and Transmitting the third signal to the feedback link; next, the feedback link processes the third signal and transmits the processed third signal to the processor; and finally, the processing The device detects the power of the processed third signal.
  • the detection device can characterize the power of the local oscillation leakage signal by detecting the power of the intermodulation signal without changing the existing link design, and related technologies. Adding a separate local oscillator to the feedback link or adding a secondary local oscillator to the RF switch reduces cost and simplifies the feedback link design.
  • FIG. 1 is a structural block diagram of a radio frequency transceiver in the related art
  • FIG. 2 is a structural block diagram of a detecting device for a local oscillation leakage signal in the related art
  • FIG. 3 is a structural block diagram of a detecting device for a local oscillation leakage signal provided in Embodiment 1;
  • FIG. 4 is a schematic flow chart of a method for detecting a local oscillation leakage signal according to Embodiment 2;
  • Figure 5 is a frequency spectrum diagram of signals in the low local oscillator scheme of the embodiment.
  • Figure 6 is a spectrogram of the signal in the high local oscillator scheme of the embodiment.
  • the present embodiment provides a detecting device for a local oscillator leakage signal.
  • the device includes a local oscillator 1, a transmitting link 2, a radio frequency power amplifier 3, a feedback link 4, and a processor 5.
  • the local oscillator 1 is connected to the transmit link 2 and the feedback link 4, respectively, and the feedback link 4 adopts an AC-coupled design; the transmit chain
  • the input of the circuit 2 is connected to the processor 5, the output of the transmit link 2 is connected to the RF power amplifier 3; the output of the RF power amplifier 3 is connected to the input of the feedback link 4, and the output of the feedback link 4 is
  • the processor 5 is connected; the output of the RF power amplifier 3 is also connected to the transmitting antenna 6.
  • the local oscillator 1 is arranged to generate a local oscillation signal and transmit the local oscillation signal to the transmission link 2.
  • the transmitting link 2 is configured to acquire a first signal, upconvert the first signal according to the received local oscillator signal to obtain a second signal, and send the second signal to the radio frequency power amplifier 3, where the The second signal includes the up-converted first signal and the local oscillator leakage signal.
  • the first signal may be generated by the transmitting link 2, or may be generated by the processor 5, in the process of up-converting the first signal according to the local oscillator signal, the transmitting link 2 generates the local a vibration leakage signal, the local oscillation leakage signal and the up-converted first signal form a second signal; the frequency of the up-converted first signal is a frequency of the first signal and a frequency of the local oscillator signal And the local oscillation leakage signal has the same frequency as the local oscillation signal.
  • the second signal is a two-tone signal.
  • the first signal may also be other signals, such as a modulated signal.
  • the RF power amplifier 3 is configured to receive and amplify the second signal, acquire an intermodulation signal generated when the second signal is amplified, select a third signal from the intermodulation signal, and send the third signal Give feedback link 4.
  • the signal output by the RF power amplifier 3 includes a plurality of intermodulation signals related to the local oscillation leakage signal in addition to the amplified second signal, the mutual The modulated signal includes a third-order intermodulation signal, a fifth-order intermodulation signal, and the like, and the radio frequency power amplifier 3 selects a third signal from the intermodulation signal and transmits the third signal to the feedback link 4.
  • the frequency of the third-order intermodulation signal in the intermodulation signal is closer to the frequency of the second signal input at the input end of the radio frequency power amplifier 3, the frequency of the third-order intermodulation signal usually falls on the radio frequency.
  • the effective frequency bandwidth of the power amplifier 3 cannot be filtered out during filtering, and other intermodulation signals are easily filtered out. Therefore, the selected third signal can be a third-order intermodulation signal.
  • the RF power amplifier 3 may be a non-linear RF power amplifier.
  • the RF power amplifier 3 may also be a linear RF power amplifier.
  • the feedback link 4 is configured to receive the third signal, process the third signal, and send the processed third signal to the processor 5.
  • the feedback link 4 can be received by the RF power amplifier 3 through a coupling circuit (not shown) a mixed signal, the mixed signal including the second signal and the third signal, however, the second signal and the third signal are processed by the feedback link 4, and the processed first signal is The frequency becomes a difference between the frequency of the up-converted first signal and the frequency of the local oscillator signal, and the processed local oscillation leakage signal becomes a zero-frequency signal, that is, the frequency of the processed local oscillation leakage signal It becomes zero, and the frequency of the processed third signal becomes a preset frequency.
  • the processor 5 is configured to receive the processed third signal and detect the power of the processed third signal.
  • the processor 5 cannot detect the processed local oscillation leakage signal power.
  • the third signal processed by the feedback link 4 is not a zero frequency signal, and the processor 5 can receive and detect the power of the processed third signal.
  • the detecting device can characterize the power of the local oscillator leakage signal by detecting the power of the third signal. That is, the local oscillator leaks power. In this way, the detecting device can realize the indirect detection of the local oscillator leakage power without increasing the link design of the related technology, and the cost is reduced and the feedback link design is simplified compared with the detecting device in the related art. , in line with the requirements of equipment miniaturization design.
  • the processor 5 may be a Field Programmable Gate Array (FPGA), a Digital Signal Processing (DSP), or the like. Of course, the processor 5 may also be another processor.
  • FPGA Field Programmable Gate Array
  • DSP Digital Signal Processing
  • the processor 5 may also be another processor.
  • the processor 5 is configured to adjust the offset compensation voltage of the digital-to-analog conversion circuit 21 in the feedback link 4 until the power of the third signal is detected to be greater than a preset threshold.
  • the power of the third signal is not greater than the preset threshold.
  • the detecting device can adjust the power of the third signal by adjusting the offset compensation voltage of the digital-to-analog conversion circuit 21 in the feedback link 4, and correspondingly, when the power of the third signal is adjusted to
  • the preset threshold is not greater than the preset threshold
  • the local oscillator leakage power is also calibrated, so that the linearity index of the wireless communication system is not affected by the local oscillator leakage, and the off-site is easily located to be related to the local oscillator. The failure of the device reduces the cost of repair and maintenance of the equipment in the system.
  • the transmit link 2 in the embodiment of the present disclosure includes, from the processor 5 to the transmit antenna 6, a digital-to-analog conversion circuit 21 and a first intermediate frequency filter circuit that are sequentially connected. 22 and a modulation circuit 23; wherein:
  • the digital-to-analog conversion circuit 21 is configured to acquire an analog signal and transmit the analog signal to the first intermediate frequency filter circuit 22.
  • the analog signal may be generated by the digital-to-analog conversion circuit 21, or may be generated by the processor 5.
  • the word signal is then converted to an analog signal by the digital to analog conversion circuit 21.
  • the analog signal may be a single tone signal, and the analog signal may also be other signals, such as a modulated signal.
  • the first intermediate frequency filter circuit 22 is configured to receive the analog signal, filter the analog signal to obtain a first signal, and send the first signal to the modulation circuit 23.
  • the first intermediate frequency filter circuit 22 may be a low pass filter.
  • the analog signal can be a tone signal
  • the first signal is also a tone signal.
  • the modulating circuit 23 is configured to receive the first signal and the local oscillator signal sent by the local oscillator, and upconvert the first signal according to the local oscillator signal to obtain a second signal, and the second signal Send to RF power amplifier 3.
  • the feedback link 4 in the embodiment of the present disclosure includes: a small signal amplifying circuit 41 and a demodulating circuit 42 connected in sequence from the transmitting antenna 6 to the processor 5; a second intermediate frequency filter circuit 43 and an analog to digital conversion circuit 44; the local oscillator 1 is connected to the modulation circuit 23 and the demodulation circuit 42, respectively, wherein:
  • the small signal amplifying circuit 41 is configured to receive the third signal transmitted by the radio frequency power amplifier 3, amplify the third signal, and transmit the amplified third signal to the demodulating circuit 42.
  • the demodulation circuit 42 is configured to receive the amplified third signal, down-convert the frequency of the amplified third signal to a preset frequency, and send the down-converted third signal to the second intermediate frequency filter Circuit 43.
  • the second intermediate frequency filter circuit 43 is configured to receive the down-converted third signal, filter the down-converted third signal, and send the filtered third signal to the analog-to-digital conversion circuit 44.
  • the analog-to-digital conversion circuit 44 is configured to receive the filtered third signal, perform analog-to-digital conversion on the filtered third signal, and send the analog-to-digital converted third signal to the processor 5.
  • the present embodiment provides a method for detecting a local oscillator leakage signal. As shown in FIG. 4, the processing flow of the method in this embodiment includes the following steps:
  • Step 410 Acquire a first signal, and upconvert the first signal according to the generated local oscillator signal to obtain a second signal, where the second signal includes the upconverted first signal and a local oscillator leakage signal;
  • Step 420 The second signal is amplified to obtain an intermodulation signal generated when the second signal is amplified, and a third signal is selected from the intermodulation signal.
  • Step 430 Process the third signal to detect the power of the processed third signal.
  • the acquiring the first signal, and upconverting the first signal according to the generated local oscillator signal to obtain a second signal comprising: acquiring an analog signal; and filtering the analog signal to obtain a first signal; The generated local oscillator signal upconverts the first signal to obtain a second signal.
  • the processing, by the third signal includes: amplifying the third signal; down-converting a frequency of the amplified third signal to a preset frequency; and performing a down-converted third signal Perform filtering; perform analog-to-digital conversion on the filtered third signal.
  • the third signal is a third-order intermodulation signal.
  • the method further includes: when detecting that the power of the third signal is greater than a preset threshold, adjusting an offset compensation voltage when acquiring the analog signal, until the power of the third signal is not Greater than the preset threshold
  • the operating frequency band of the wireless system is 3400 MHz-3600 MHz, and the signal frequency of the second intermediate frequency filter circuit can be received by 245 MHz +/- 200 MHz;
  • the method for detecting the local oscillator leakage signal includes the following steps:
  • Step 501 the digital-to-analog conversion circuit 21 outputs a tone signal, and transmits the tone signal to the first intermediate frequency filter circuit 22;
  • the tone amplitude of the tone signal is -17dBFs.
  • the frequency setting of the tone signal needs to consider the frequency bandwidth of the signal that the second intermediate frequency filter circuit 43 can receive, and the frequency of the signal that the second intermediate frequency filter circuit 43 can receive should be lower than the frequency bandwidth of the second intermediate frequency filter circuit 43. .
  • Step 502 The first intermediate frequency filtering circuit 22 receives the single tone signal, filters the single tone signal to obtain a filtered tone signal, and sends the filtered tone signal to the modulation circuit 23.
  • Step 503 The local oscillator 1 generates a local oscillator signal, and sends the local oscillator signal to the modulation circuit 23.
  • the local oscillator frequency fLO of the local oscillator signal is 3315 MHz.
  • Step 504 The modulation circuit 23 receives the filtered tone signal and the local oscillator signal, and up-converts the filtered tone signal according to the local oscillator signal to obtain an up-converted tone signal and a local The leakage signal is transmitted, and the up-converted tone signal and the local oscillation leakage signal are transmitted to the RF power amplifier 3.
  • Step 505 the RF power amplifier 3 receives and amplifies the up-converted tone signal and the local oscillator leakage signal, and obtains an intermodulation signal generated when the up-converted tone signal and the local oscillator leakage signal are amplified.
  • a third-order intermodulation signal is selected from the intermodulation signal, and the third-order intermodulation signal is sent to the small signal amplifying circuit 41.
  • the power of the third-order intermodulation signal of 2frf-fLO is greater than the power of the third-order intermodulation signal with the frequency of 2fLO-frf. Therefore, the third-order intermodulation signal with the frequency of 2frf-fLO is selected as the detection signal and sent to the small signal amplification.
  • Step 506 The small signal amplifying circuit 41 receives the third-order intermodulation signal sent by the radio frequency power amplifier 3, and amplifies the third-order intermodulation signal and sends the amplified third-order intermodulation signal to the demodulation circuit 42.
  • Step 507 the demodulation circuit 42 receives the amplified third-order intermodulation signal, down-converts the frequency of the amplified third-order intermodulation signal to a preset frequency, and converts the third-order intermodulation signal after down-conversion. It is sent to the second intermediate frequency filter circuit 43.
  • Step 508 the second intermediate frequency filter circuit 43 receives the down-converted third-order intermodulation signal, filters the down-converted third-order intermodulation signal, and sends the filtered third-order intermodulation signal to the modulus. Conversion circuit 44.
  • Step 509 the analog-to-digital conversion circuit 44 receives the filtered third-order intermodulation signal, performs analog-to-digital conversion on the filtered third-order intermodulation signal, and sends the analog-to-digital converted third-order intermodulation signal to the processing.
  • Device 5 the analog-to-digital conversion circuit 44 receives the filtered third-order intermodulation signal, performs analog-to-digital conversion on the filtered third-order intermodulation signal, and sends the analog-to-digital converted third-order intermodulation signal to the processing.
  • Step 509 the analog-to-digital conversion circuit 44 receives the filtered third-order intermodulation signal, performs analog-to-digital conversion on the filtered third-order intermodulation signal, and sends the analog-to-digital converted third-order intermodulation signal to the processing.
  • Device 5 the analog-to-digital conversion circuit 44 receives the filtered third-order intermodulation signal, performs analog-to-digital conversion on the filtered third-order inter
  • Step 510 The processor 5 receives the third-order intermodulation signal after the analog-to-digital conversion, and detects the power of the third-order intermodulation signal after the analog-to-digital conversion.
  • the detection method of the local oscillator leakage signal includes the following steps:
  • Step 601 the digital-to-analog conversion circuit 21 outputs a tone signal, and is filtered by the first intermediate frequency filter circuit 22 and then sent to the modulation circuit 23.
  • Step 602 The local oscillator 1 generates a local oscillator signal, and sends the local oscillator signal to the modulation circuit 23.
  • the local oscillator frequency fLO of the local oscillator signal is 3775.
  • Step 603 the modulation circuit 23 up-converts the filtered tone signal according to the local oscillator signal to obtain an up-converted tone signal and a local oscillation leakage signal, and the up-converted tone signal and The local oscillator leakage signal is sent to the RF power amplifier 3.
  • the frequency of the local oscillation leakage signal is 3775 MHz, which is higher than the frequency of the up-converted tone signal.
  • Step 604 the up-converted tone signal and the local oscillator leakage signal pass through an intermodulation signal generated by the radio frequency power amplifier 3, select a third-order intermodulation signal from the intermodulation signal, and perform the third-order intermodulation signal.
  • the signal is sent to the demodulation circuit 42 via the small signal amplifying circuit 41.
  • the third-order intermodulation signal with the frequency of 2frf-fLO is selected, that is, the third-order intermodulation of the low-end
  • Step 605 The demodulation circuit 42 down-converts the frequency of the amplified third-order intermodulation signal to a preset frequency, and filters the down-converted third-order intermodulation signal by the second intermediate frequency filter circuit 43 and the analog-to-digital conversion circuit 44.
  • the digital to analog conversion is sent to the processor 5.
  • Step 605 The processor receives the third-order intermodulation signal after the analog-to-digital conversion, and detects the power of the third-order intermodulation signal after the analog-to-digital conversion.
  • embodiments of the present disclosure can be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • a detecting device for a local oscillator leakage signal provided by the embodiment of the present disclosure, the frequency of the local oscillator leakage signal becomes zero due to the processing of the feedback link, and the processor cannot detect the local oscillator leakage power, but mutual The frequency of the modulated signal is not zero, and the power of the intermodulation signal has a positive linear correlation with the local leakage power. Therefore, the detecting device can detect the intermodulation signal without changing the existing link design.
  • the power to characterize the power of the local oscillator leakage signal reduces the cost and simplifies the feedback link design by adding an independent local oscillator or adding a secondary local oscillator and the RF switch in the related art. .

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

A device for detecting a local oscillation signal, comprising: a transmission link, configured to acquire a first signal, upconvert the first signal according to a local oscillation signal generated by a local oscillator to obtain a second signal, and transmit the second signal to a radio frequency power amplifier, the second signal including the up-converted first signal and the local oscillation signal; the radio frequency power amplifier, configured to amplify the second signal, acquire an intermodulation signal generated when the second signal is amplified, select a third signal from the intermodulation signal and transmit the third signal to a feedback link; the feedback link, configured to process the third signal and transmit the processed third signal to a processor; and the processor, configured to detect the power of the processed third signal.

Description

本振泄漏信号的检测方法及装置Local vibration leakage signal detecting method and device 技术领域Technical field
本公开涉及无线通信领域，例如涉及一种本振泄漏信号的检测方法及装置。The present disclosure relates to the field of wireless communications, for example, to a method and apparatus for detecting a local oscillator leakage signal.
背景技术Background technique
在无线通信***中，通常会要求发射信号具有大带宽和高线性的特点，这就对无线通信***的杂散指标和线性指标的提出很高的要求。在射频拉远单元(Radio Remote Unit，RRU)中，发射信号通过发射链路发射出去，发射链路中的上变频模块通常使用正交调制来实现上变频，由于上变频模块中的器件如调制器本身存在固有直流偏置，故在上变频的过程中会产生本振泄漏信号等无用信号，而本振泄漏信号会导致杂散指标不满足相关标准并且直接影响***的线性，因此，降低本振泄漏是非常必要的。In a wireless communication system, the transmission signal is usually required to have a large bandwidth and a high linearity, which places high demands on the spurious and linear indicators of the wireless communication system. In a Radio Remote Unit (RRU), a transmit signal is transmitted through a transmit link. The upconversion module in the transmit link typically uses quadrature modulation to achieve upconversion, due to devices such as modulation in the upconversion module. The inherent DC offset of the device itself causes an unwanted signal such as a local oscillator leakage signal during the up-conversion process, and the local oscillator leakage signal causes the spurious index to not meet the relevant standard and directly affects the linearity of the system. Vibration leakage is very necessary.
目前，通常通过检测和校准本振泄漏功率来降低本振泄漏，而本振泄漏功率会随着频率、温度和时间产生参数漂移，故如果要消除本振泄漏功率，一般需要在特定温度和时间下检测和校准本振泄漏功率。At present, the LO leakage is usually reduced by detecting and calibrating the LO leakage power, and the LO leakage power will drift with the frequency, temperature and time. Therefore, if the LO leakage power is to be eliminated, it is generally required at a specific temperature and time. The local oscillator leakage power is detected and calibrated.
但是，在如图1所示的射频收发信机中，发射链路2和反馈链路4连接同一个本地振荡器(简称本振)1，且反馈链路4采用交流耦合的设计，故发射链路2产生的本振泄漏信号经过反馈链路4后变为零频信号，处理器5例如现场可编程门阵列(Field Programmable Gate Array，FPGA)就不能检测出所述反馈链路4中的本振泄漏功率。若要检测出本振泄漏功率，就需要在反馈链路4上增加一个独立的本振，或者如图2所示，增加一个辅本振7和射频开关8，所述射频开关8用于选择切换所述反馈链路4与本振1或者辅本振7连接，在需要检测本振泄漏功率时，将射频开关8切换到辅本振7上，通过改变辅本振7的频率，就可以将本振泄漏频率移频至中频频率，处理器5就可以检测出所述反馈链路4中的本振泄漏功率。However, in the radio frequency transceiver shown in FIG. 1, the transmitting link 2 and the feedback link 4 are connected to the same local oscillator (abbreviated as local oscillator) 1, and the feedback link 4 is designed to be AC-coupled, so that the transmitting The local oscillator leakage signal generated by the link 2 passes through the feedback link 4 and becomes a zero-frequency signal. The processor 5, such as a Field Programmable Gate Array (FPGA), cannot detect the feedback link 4 Local oscillator leakage power. To detect the local oscillator leakage power, an independent local oscillator needs to be added to the feedback link 4, or as shown in FIG. 2, a secondary local oscillator 7 and an RF switch 8 are added, and the RF switch 8 is used for selection. Switching the feedback link 4 to the local oscillator 1 or the auxiliary local oscillator 7 to switch the RF switch 8 to the auxiliary local oscillator 7 when the local oscillator leakage power needs to be detected, and by changing the frequency of the auxiliary local oscillator 7, By shifting the local oscillator leakage frequency to the intermediate frequency, the processor 5 can detect the local oscillator leakage power in the feedback link 4.
然而，在反馈链路上增加一个独立的本振或者增加一个辅本振和射频开关都会增加成本并且不符合设备设计小型化的要求；但若不增加这些电路，则无法对本振泄漏功率进行检测，更无法对本振泄漏功率进行在线校准，这样，就会影响***的线性指标，并且在外场很难定位到与本振泄漏相关的故障，增加了***中设备后期返修和维护成本。 However, adding a separate local oscillator to the feedback link or adding a secondary local oscillator and RF switch will increase the cost and not meet the requirements for miniaturization of the device design; however, if these circuits are not added, the local oscillator leakage power cannot be detected. It is even more impossible to calibrate the local oscillator leakage power online, which will affect the linearity of the system, and it is difficult to locate the fault related to the local oscillator leakage in the external field, which increases the cost of repair and maintenance of the equipment in the system.
发明内容Summary of the invention
本公开实施例提供一种本振泄漏信号的检测方法及装置，解决了相关技术中存在的技术问题，可以降低成本、简化反馈链路设计。The embodiments of the present disclosure provide a method and a device for detecting a local oscillator leakage signal, which solve the technical problems existing in the related art, can reduce the cost, and simplify the design of the feedback link.
第一方面，本公开实施例提供了一种本振泄漏信号的检测装置，所述装置包括：本地振荡器、发射链路、射频功率放大器、反馈链路和处理器，其中，In a first aspect, an embodiment of the present disclosure provides a device for detecting a local oscillator leakage signal, the device comprising: a local oscillator, a transmit link, a radio frequency power amplifier, a feedback link, and a processor, where
所述本地振荡器，设置为产生本振信号，并将所述本振信号发送给所述发射链路；The local oscillator is configured to generate a local oscillator signal and transmit the local oscillator signal to the transmit link;
所述发射链路，设置为获取第一信号，根据接收到的本振信号将所述第一信号进行上变频得到第二信号，并将所述第二信号发送给所述射频功率放大器，所述第二信号包括上变频后的第一信号和本振泄漏信号；The transmitting link is configured to acquire a first signal, upconvert the first signal according to the received local oscillator signal to obtain a second signal, and send the second signal to the radio frequency power amplifier. The second signal includes the up-converted first signal and the local oscillator leakage signal;
所述射频功率放大器，设置为接收并放大所述第二信号，获取放大所述第二信号时产生的互调信号，从所述互调信号中选取第三信号，并将所述第三信号发送给所述反馈链路；The radio frequency power amplifier is configured to receive and amplify the second signal, acquire an intermodulation signal generated when the second signal is amplified, select a third signal from the intermodulation signal, and select the third signal Sent to the feedback link;
所述反馈链路，设置为接收所述第三信号，将所述第三信号进行处理并将处理后的第三信号发送给所述处理器；The feedback link is configured to receive the third signal, process the third signal, and send the processed third signal to the processor;
所述处理器，设置为接收所述处理后的第三信号，并检测所述处理后的第三信号的功率。The processor is configured to receive the processed third signal and detect the power of the processed third signal.
可选地，所述发射链路包括：数模转换电路、第一中频滤波电路和调制电路，其中，Optionally, the transmitting link includes: a digital to analog conversion circuit, a first intermediate frequency filtering circuit, and a modulation circuit, where
所述数模转换电路，设置为获取模拟信号，并将所述模拟信号发送给所述第一中频滤波电路；The digital-to-analog conversion circuit is configured to acquire an analog signal, and send the analog signal to the first intermediate frequency filter circuit;
所述第一中频滤波电路，设置为接收所述模拟信号，对所述模拟信号进行滤波获得第一信号，并将所述第一信号发送给所述调制电路；The first intermediate frequency filter circuit is configured to receive the analog signal, filter the analog signal to obtain a first signal, and send the first signal to the modulation circuit;
所述调制电路，设置为接收所述第一信号和所述本地振荡器发送的本振信号，根据所述本振信号将所述第一信号进行上变频得到第二信号，并将所述第二信号发送给所述射频功率放大器。The modulating circuit is configured to receive the first signal and a local oscillator signal sent by the local oscillator, and upconvert the first signal according to the local oscillator signal to obtain a second signal, and Two signals are sent to the RF power amplifier.
在上述方案中，所述反馈链路包括：小信号放大电路、解调电路、第二中频滤波电路和模数转换电路，其中，In the above solution, the feedback link includes: a small signal amplifying circuit, a demodulating circuit, a second intermediate frequency filtering circuit, and an analog to digital conversion circuit, wherein
所述小信号放大电路，设置为接收所述射频功率放大器发送的第三信号，对所述第三信号进行放大并将放大后的第三信号发送给所述解调电路；The small signal amplifying circuit is configured to receive a third signal sent by the radio frequency power amplifier, amplify the third signal, and send the amplified third signal to the demodulation circuit;
所述解调电路，设置为接收所述放大后的第三信号，将所述放大后的第三 信号的频率下变频为预设频率，并将下变频后的第三信号发送给所述第二中频滤波电路；The demodulation circuit is configured to receive the amplified third signal, and to perform the amplified third The frequency of the signal is down-converted to a preset frequency, and the down-converted third signal is sent to the second intermediate frequency filter circuit;
所述第二中频滤波电路，设置为接收所述下变频后的第三信号，对所述下变频后的第三信号进行滤波并将滤波后的第三信号发送给所述模数转换电路；The second intermediate frequency filter circuit is configured to receive the down-converted third signal, filter the down-converted third signal, and send the filtered third signal to the analog-to-digital conversion circuit;
所述模数转换电路，设置为接收所述滤波后的第三信号，对所述滤波后的第三信号进行模数转换并将模数转换后的第三信号发送给所述处理器。The analog-to-digital conversion circuit is configured to receive the filtered third signal, perform analog-to-digital conversion on the filtered third signal, and send the analog-to-digital converted third signal to the processor.
可选地，所述第三信号为三阶互调信号。Optionally, the third signal is a third-order intermodulation signal.
可选地，所述处理器，是设置为在检测到所述第三信号的功率大于预设门限值时，调整所述数模转换电路的偏置补偿电压，直至所述第三信号的功率不大于所述预设门限值。Optionally, the processor is configured to adjust an offset compensation voltage of the digital-to-analog conversion circuit until the third signal is detected when the power of the third signal is detected to be greater than a preset threshold The power is not greater than the preset threshold.
第二方面，本公开实施例提供了一种本振泄漏信号的检测方法，所述方法包括：In a second aspect, an embodiment of the present disclosure provides a method for detecting a local oscillation leakage signal, where the method includes:
获取第一信号，根据产生的本振信号将所述第一信号进行上变频得到第二信号，所述第二信号包括上变频后的第一信号和本振泄漏信号；Obtaining a first signal, performing upconversion of the first signal according to the generated local oscillator signal to obtain a second signal, where the second signal includes the upconverted first signal and a local oscillator leakage signal;
将所述第二信号放大，获取放大所述第二信号时产生的互调信号，从所述互调信号中选取第三信号；将所述第三信号进行处理，检测处理后的第三信号的功率。Amplifying the second signal, acquiring an intermodulation signal generated when the second signal is amplified, selecting a third signal from the intermodulation signal, processing the third signal, and detecting the processed third signal Power.
可选地，所述获取第一信号，根据产生的本振信号将所述第一信号进行上变频得到第二信号，包括：Optionally, the acquiring the first signal, and upconverting the first signal according to the generated local oscillator signal to obtain the second signal, including:
获取模拟信号；Acquire an analog signal;
对所述模拟信号进行滤波获得第一信号；Filtering the analog signal to obtain a first signal;
根据产生的本振信号将所述第一信号进行上变频得到第二信号。The first signal is upconverted according to the generated local oscillator signal to obtain a second signal.
可选地，所述将所述第三信号进行处理，包括：Optionally, the processing the third signal includes:
对所述第三信号进行放大；Amplifying the third signal;
将放大后的第三信号的频率下变频为预设频率；Downconverting the frequency of the amplified third signal to a preset frequency;
对下变频后的第三信号进行滤波；Filtering the third signal after down-conversion;
对滤波后的第三信号进行模数转换。Analog-to-digital conversion is performed on the filtered third signal.
可选地，所述第三信号为三阶互调信号。Optionally, the third signal is a third-order intermodulation signal.
可选地，所述方法还包括：Optionally, the method further includes:
在检测到所述第三信号的功率大于预设门限值时，调整获取所述模拟信号时的偏置补偿电压，直至所述第三信号的功率不大于所述预设门限值。 When detecting that the power of the third signal is greater than a preset threshold, adjusting the offset compensation voltage when acquiring the analog signal until the power of the third signal is not greater than the preset threshold.
本公开实施例提供了一种本振泄漏信号的检测方法及装置，所述检测装置包括：本地振荡器、发射链路、射频功率放大器、反馈链路和处理器，首先，所述本地振荡器产生本振信号，并将所述本振信号发送给所述发射链路；然后，所述发射链路获取第一信号，根据接收到的本振信号将所述第一信号进行上变频得到第二信号，并将所述第二信号发送给所述射频功率放大器；所述射频功率放大器获取放大所述第二信号时产生的互调信号，从所述互调信号中选取第三信号，并将所述第三信号发送给所述反馈链路；接下来，所述反馈链路将所述第三信号进行处理并将处理后的第三信号发送给所述处理器；最后，所述处理器检测所述处理后的第三信号的功率。由于经过所述反馈链路的处理，本振泄漏信号的频率变为零，所述处理器不能检测出本振泄漏功率，但是互调信号的频率不为零，并且互调信号的功率与本振泄漏功率具有正线性相关的特性，因此，所述检测装置不需要改变现有链路设计，就可以通过检测所述互调信号的功率来表征所述本振泄漏信号的功率，与相关技术中在反馈链路上增加一个独立的本振或者增加一个辅本振和射频开关相比，降低了成本、简化了反馈链路设计。Embodiments of the present disclosure provide a method and apparatus for detecting a local oscillation leakage signal, the detection apparatus including: a local oscillator, a transmission link, a radio frequency power amplifier, a feedback link, and a processor. First, the local oscillator Generating a local oscillator signal and transmitting the local oscillator signal to the transmit link; then, the transmit link acquires a first signal, and upconverting the first signal according to the received local oscillator signal to obtain a Transmitting the second signal to the radio frequency power amplifier; the radio frequency power amplifier acquires an intermodulation signal generated when the second signal is amplified, and selects a third signal from the intermodulation signal, and Transmitting the third signal to the feedback link; next, the feedback link processes the third signal and transmits the processed third signal to the processor; and finally, the processing The device detects the power of the processed third signal. Due to the processing of the feedback link, the frequency of the local oscillator leakage signal becomes zero, the processor cannot detect the local oscillator leakage power, but the frequency of the intermodulation signal is not zero, and the power of the intermodulation signal is The vibration leakage power has a characteristic of positive linear correlation. Therefore, the detection device can characterize the power of the local oscillation leakage signal by detecting the power of the intermodulation signal without changing the existing link design, and related technologies. Adding a separate local oscillator to the feedback link or adding a secondary local oscillator to the RF switch reduces cost and simplifies the feedback link design.
附图概述BRIEF abstract
图1为相关技术中一种射频收发信机的结构框图；1 is a structural block diagram of a radio frequency transceiver in the related art;
图2为相关技术中一种本振泄漏信号的检测装置的结构框图；2 is a structural block diagram of a detecting device for a local oscillation leakage signal in the related art;
图3为实施例1提供的一种本振泄漏信号的检测装置的结构框图；3 is a structural block diagram of a detecting device for a local oscillation leakage signal provided in Embodiment 1;
图4为实施例2提供的一种本振泄漏信号的检测方法的流程示意图；4 is a schematic flow chart of a method for detecting a local oscillation leakage signal according to Embodiment 2;
图5为实施例的低本振方案中信号的频谱图；Figure 5 is a frequency spectrum diagram of signals in the low local oscillator scheme of the embodiment;
图6为实施例的高本振方案中信号的频谱图。Figure 6 is a spectrogram of the signal in the high local oscillator scheme of the embodiment.
具体实施方式detailed description
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述。在不冲突的情况下，以下实施例和实施例中的特征可以相互组合。实施例1The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. The features of the following embodiments and embodiments may be combined with each other without conflict. Example 1
本实施例提供了一种本振泄漏信号的检测装置，如图3所示，所述装置包括：本振1、发射链路2、射频功率放大器3、反馈链路4和处理器5。其中，本振1分别与发射链路2和反馈链路4连接，所述反馈链路4采用交流耦合的设计；发射链 路2的输入端与处理器5连接，发射链路2的输出端与射频功率放大器3连接；射频功率放大器3的输出端与反馈链路4的输入端连接，反馈链路4的输出端与处理器5连接；射频功率放大器3输出端还与发射天线6连接。The present embodiment provides a detecting device for a local oscillator leakage signal. As shown in FIG. 3, the device includes a local oscillator 1, a transmitting link 2, a radio frequency power amplifier 3, a feedback link 4, and a processor 5. The local oscillator 1 is connected to the transmit link 2 and the feedback link 4, respectively, and the feedback link 4 adopts an AC-coupled design; the transmit chain The input of the circuit 2 is connected to the processor 5, the output of the transmit link 2 is connected to the RF power amplifier 3; the output of the RF power amplifier 3 is connected to the input of the feedback link 4, and the output of the feedback link 4 is The processor 5 is connected; the output of the RF power amplifier 3 is also connected to the transmitting antenna 6.
结合本公开实施例，在上述检测装置中，本振1，设置为产生本振信号，并将所述本振信号发送给发射链路2。In conjunction with an embodiment of the present disclosure, in the above detection apparatus, the local oscillator 1 is arranged to generate a local oscillation signal and transmit the local oscillation signal to the transmission link 2.
发射链路2，设置为获取第一信号，根据接收到的本振信号将所述第一信号进行上变频得到第二信号，并将所述第二信号发送给射频功率放大器3，所述第二信号中包括上变频后的第一信号和本振泄漏信号。The transmitting link 2 is configured to acquire a first signal, upconvert the first signal according to the received local oscillator signal to obtain a second signal, and send the second signal to the radio frequency power amplifier 3, where the The second signal includes the up-converted first signal and the local oscillator leakage signal.
这里，所述第一信号可以由发射链路2产生，也可以由处理器5产生，在根据所述本振信号将所述第一信号进行上变频的过程中，发射链路2会产生本振泄漏信号，所述本振泄漏信号和上变频后的第一信号形成第二信号；所述上变频后的第一信号的频率为所述第一信号的频率与所述本振信号的频率之和，所述本振泄漏信号与所述本振信号的频率相同。Here, the first signal may be generated by the transmitting link 2, or may be generated by the processor 5, in the process of up-converting the first signal according to the local oscillator signal, the transmitting link 2 generates the local a vibration leakage signal, the local oscillation leakage signal and the up-converted first signal form a second signal; the frequency of the up-converted first signal is a frequency of the first signal and a frequency of the local oscillator signal And the local oscillation leakage signal has the same frequency as the local oscillation signal.
可选的，当所述第一信号和所述本振泄漏信号均为单音信号时，所述第二信号为双音信号。可选的，所述第一信号也可以为其他信号，例如调制信号。Optionally, when the first signal and the local oscillation leakage signal are both single tone signals, the second signal is a two-tone signal. Optionally, the first signal may also be other signals, such as a modulated signal.
射频功率放大器3，设置为接收并放大所述第二信号，获取放大所述第二信号时产生的互调信号，从所述互调信号中选取第三信号，并将所述第三信号发送给反馈链路4。The RF power amplifier 3 is configured to receive and amplify the second signal, acquire an intermodulation signal generated when the second signal is amplified, select a third signal from the intermodulation signal, and send the third signal Give feedback link 4.
这里需要说明的是，由于射频功率放大器3的非线性失真特性，射频功率放大器3输出的信号除了放大的第二信号以外，还包括多种与本振泄漏信号相关的互调信号，所述互调信号包括三阶互调信号、五阶互调信号等，射频功率放大器3会从所述互调信号中选取第三信号，并将所述第三信号发送给反馈链路4。It should be noted that, due to the nonlinear distortion characteristic of the RF power amplifier 3, the signal output by the RF power amplifier 3 includes a plurality of intermodulation signals related to the local oscillation leakage signal in addition to the amplified second signal, the mutual The modulated signal includes a third-order intermodulation signal, a fifth-order intermodulation signal, and the like, and the radio frequency power amplifier 3 selects a third signal from the intermodulation signal and transmits the third signal to the feedback link 4.
可选的，由于所述互调信号中的三阶互调信号的频率与射频功率放大器3输入端输入的所述第二信号的频率较为接近，三阶互调信号的频率通常会落在射频功率放大器3的有效频率带宽内，不能在滤波时滤除，而其他互调信号容易被滤除，因此，选取的第三信号可以为三阶互调信号。Optionally, since the frequency of the third-order intermodulation signal in the intermodulation signal is closer to the frequency of the second signal input at the input end of the radio frequency power amplifier 3, the frequency of the third-order intermodulation signal usually falls on the radio frequency. The effective frequency bandwidth of the power amplifier 3 cannot be filtered out during filtering, and other intermodulation signals are easily filtered out. Therefore, the selected third signal can be a third-order intermodulation signal.
这里，射频功率放大器3可以为非线性射频功率放大器，可选的，所述射频功率放大器3还可以为线性射频功率放大器。Here, the RF power amplifier 3 may be a non-linear RF power amplifier. Alternatively, the RF power amplifier 3 may also be a linear RF power amplifier.
反馈链路4，设置为接收所述第三信号，将所述第三信号进行处理并将处理后的第三信号发送给处理器5。The feedback link 4 is configured to receive the third signal, process the third signal, and send the processed third signal to the processor 5.
反馈链路4可以通过耦合电路(图中未示出)接收射频功率放大器3发送的 混合信号，所述混合信号中包括所述第二信号和所述第三信号，然而，所述第二信号和所述第三信号在经过反馈链路4处理后，处理后的第一信号的频率变为所述上变频后的第一信号的频率与所述本振信号的频率之差，处理后的本振泄漏信号变为零频信号，即所述处理后的本振泄漏信号的频率变为零，处理后的第三信号的频率变为预设频率。The feedback link 4 can be received by the RF power amplifier 3 through a coupling circuit (not shown) a mixed signal, the mixed signal including the second signal and the third signal, however, the second signal and the third signal are processed by the feedback link 4, and the processed first signal is The frequency becomes a difference between the frequency of the up-converted first signal and the frequency of the local oscillator signal, and the processed local oscillation leakage signal becomes a zero-frequency signal, that is, the frequency of the processed local oscillation leakage signal It becomes zero, and the frequency of the processed third signal becomes a preset frequency.
处理器5，设置为接收所述处理后的第三信号，并检测所述处理后的第三信号的功率。The processor 5 is configured to receive the processed third signal and detect the power of the processed third signal.
由于经反馈链路4处理后的本振泄漏信号变为零频信号，处理器5就不能检测出所述处理后的本振泄漏信号功率。而经反馈链路4处理后的第三信号不为零频信号，处理器5可以接收并检测出所述处理后的第三信号的功率。Since the local oscillation leakage signal processed by the feedback link 4 becomes a zero frequency signal, the processor 5 cannot detect the processed local oscillation leakage signal power. The third signal processed by the feedback link 4 is not a zero frequency signal, and the processor 5 can receive and detect the power of the processed third signal.
由于所述处理后的第三信号的功率与所述本振泄漏信号功率正线性相关，因此，所述检测装置可以通过检测出的第三信号的功率来表征所述本振泄漏信号的功率，即本振泄漏功率。这样，所述检测装置在不增加相关技术中链路设计的基础上，就可以实现对本振泄漏功率的间接检测，与相关技术中的检测装置相比，降低了成本，简化了反馈链路设计，符合设备小型化设计的要求。Since the power of the processed third signal is positively and linearly related to the local oscillator leakage signal power, the detecting device can characterize the power of the local oscillator leakage signal by detecting the power of the third signal. That is, the local oscillator leaks power. In this way, the detecting device can realize the indirect detection of the local oscillator leakage power without increasing the link design of the related technology, and the cost is reduced and the feedback link design is simplified compared with the detecting device in the related art. , in line with the requirements of equipment miniaturization design.
这里，处理器5可以为现场可编程门阵列(Field Programmable Gate Array，FPGA)、数字信号处理器(Digital Signal Processing，DSP)等，当然，所述处理器5还可以为其他处理器。Here, the processor 5 may be a Field Programmable Gate Array (FPGA), a Digital Signal Processing (DSP), or the like. Of course, the processor 5 may also be another processor.
可选的，处理器5是设置为在检测到所述第三信号的功率大于预设门限值时，调整所述反馈链路4中数模转换电路21的偏置补偿电压，直至所述第三信号的功率不大于所述预设门限值。这样，所述检测装置就可以通过调整所述反馈链路4中数模转换电路21的偏置补偿电压来调整所述第三信号的功率，相应的，当所述第三信号的功率调整到不大于所述预设门限值时，所述本振泄漏功率也得到校准，从而，就不会因本振泄漏而影响无线通信***的线性指标，并且，在场外容易定位到与本振相关的故障，降低了***中设备后期返修和维护成本。Optionally, the processor 5 is configured to adjust the offset compensation voltage of the digital-to-analog conversion circuit 21 in the feedback link 4 until the power of the third signal is detected to be greater than a preset threshold. The power of the third signal is not greater than the preset threshold. In this way, the detecting device can adjust the power of the third signal by adjusting the offset compensation voltage of the digital-to-analog conversion circuit 21 in the feedback link 4, and correspondingly, when the power of the third signal is adjusted to When the preset threshold is not greater than the preset threshold, the local oscillator leakage power is also calibrated, so that the linearity index of the wireless communication system is not affected by the local oscillator leakage, and the off-site is easily located to be related to the local oscillator. The failure of the device reduces the cost of repair and maintenance of the equipment in the system.
可选的，结合实际应用，如图3所示，本公开实施例中的发射链路2从处理器5到发射天线6方向上包括：依次连接的数模转换电路21、第一中频滤波电路22和调制电路23；其中：Optionally, in combination with the actual application, as shown in FIG. 3, the transmit link 2 in the embodiment of the present disclosure includes, from the processor 5 to the transmit antenna 6, a digital-to-analog conversion circuit 21 and a first intermediate frequency filter circuit that are sequentially connected. 22 and a modulation circuit 23; wherein:
数模转换电路21，设置为获取模拟信号，并将所述模拟信号发送给第一中频滤波电路22。The digital-to-analog conversion circuit 21 is configured to acquire an analog signal and transmit the analog signal to the first intermediate frequency filter circuit 22.
这里，所述模拟信号可以由数模转换电路21产生，也可以由处理器5生成数 字信号，再由数模转换电路21转换为模拟信号。Here, the analog signal may be generated by the digital-to-analog conversion circuit 21, or may be generated by the processor 5. The word signal is then converted to an analog signal by the digital to analog conversion circuit 21.
可选的，所述模拟信号可以为单音信号，所述模拟信号也可以为其他信号，例如调制信号。Optionally, the analog signal may be a single tone signal, and the analog signal may also be other signals, such as a modulated signal.
第一中频滤波电路22，设置为接收所述模拟信号，对所述模拟信号进行滤波获得第一信号，并将所述第一信号发送给调制电路23。The first intermediate frequency filter circuit 22 is configured to receive the analog signal, filter the analog signal to obtain a first signal, and send the first signal to the modulation circuit 23.
这里，第一中频滤波电路22可以为低通滤波器。Here, the first intermediate frequency filter circuit 22 may be a low pass filter.
可选的，当所述模拟信号可以为单音信号时，所述第一信号也为单音信号。Optionally, when the analog signal can be a tone signal, the first signal is also a tone signal.
调制电路23，设置为接收所述第一信号和所述本振发送的本振信号，根据所述本振信号将所述第一信号进行上变频得到第二信号，并将所述第二信号发送给射频功率放大器3。The modulating circuit 23 is configured to receive the first signal and the local oscillator signal sent by the local oscillator, and upconvert the first signal according to the local oscillator signal to obtain a second signal, and the second signal Send to RF power amplifier 3.
可选的，结合实际应用，如图3所示，本公开实施例中的反馈链路4从发射天线6到处理器5方向上包括：依次连接的小信号放大电路41、解调电路42、第二中频滤波电路43和模数转换电路44；本振1分别与调制电路23和解调电路42连接，其中：Optionally, in combination with the actual application, as shown in FIG. 3, the feedback link 4 in the embodiment of the present disclosure includes: a small signal amplifying circuit 41 and a demodulating circuit 42 connected in sequence from the transmitting antenna 6 to the processor 5; a second intermediate frequency filter circuit 43 and an analog to digital conversion circuit 44; the local oscillator 1 is connected to the modulation circuit 23 and the demodulation circuit 42, respectively, wherein:
小信号放大电路41，设置为接收射频功率放大器3发送的第三信号，对所述第三信号进行放大并将放大后的第三信号发送给解调电路42。The small signal amplifying circuit 41 is configured to receive the third signal transmitted by the radio frequency power amplifier 3, amplify the third signal, and transmit the amplified third signal to the demodulating circuit 42.
解调电路42，设置为接收所述放大后的第三信号，将所述放大后的第三信号的频率下变频为预设频率，并将下变频后的第三信号发送给第二中频滤波电路43。The demodulation circuit 42 is configured to receive the amplified third signal, down-convert the frequency of the amplified third signal to a preset frequency, and send the down-converted third signal to the second intermediate frequency filter Circuit 43.
第二中频滤波电路43，设置为接收所述下变频后的第三信号，对所述下变频后的第三信号进行滤波并将滤波后的第三信号发送给模数转换电路44。The second intermediate frequency filter circuit 43 is configured to receive the down-converted third signal, filter the down-converted third signal, and send the filtered third signal to the analog-to-digital conversion circuit 44.
模数转换电路44，设置为接收所述滤波后的第三信号，对所述滤波后的第三信号进行模数转换并将模数转换后的第三信号发送给处理器5。The analog-to-digital conversion circuit 44 is configured to receive the filtered third signal, perform analog-to-digital conversion on the filtered third signal, and send the analog-to-digital converted third signal to the processor 5.
实施例2Example 2
本实施例提供了一种本振泄漏信号的检测方法，如图4所示，本实施例方法的处理流程包括以下步骤：The present embodiment provides a method for detecting a local oscillator leakage signal. As shown in FIG. 4, the processing flow of the method in this embodiment includes the following steps:
步骤410、获取第一信号，根据产生的本振信号将所述第一信号进行上变频得到第二信号，所述第二信号包括上变频后的第一信号和本振泄漏信号；Step 410: Acquire a first signal, and upconvert the first signal according to the generated local oscillator signal to obtain a second signal, where the second signal includes the upconverted first signal and a local oscillator leakage signal;
步骤420、将所述第二信号放大，获取放大所述第二信号时产生的互调信号，从所述互调信号中选取第三信号；Step 420: The second signal is amplified to obtain an intermodulation signal generated when the second signal is amplified, and a third signal is selected from the intermodulation signal.
步骤430、将所述第三信号进行处理，检测处理后的第三信号的功率。 Step 430: Process the third signal to detect the power of the processed third signal.
可选的，所述获取第一信号，根据产生的本振信号将所述第一信号进行上变频得到第二信号，包括：获取模拟信号；对所述模拟信号进行滤波获得第一信号；根据产生的本振信号将所述第一信号进行上变频得到第二信号。Optionally, the acquiring the first signal, and upconverting the first signal according to the generated local oscillator signal to obtain a second signal, comprising: acquiring an analog signal; and filtering the analog signal to obtain a first signal; The generated local oscillator signal upconverts the first signal to obtain a second signal.
可选的，所述将所述第三信号进行处理，包括：对所述第三信号进行放大；将放大后的第三信号的频率下变频为预设频率；对下变频后的第三信号进行滤波；对滤波后的第三信号进行模数转换。Optionally, the processing, by the third signal, includes: amplifying the third signal; down-converting a frequency of the amplified third signal to a preset frequency; and performing a down-converted third signal Perform filtering; perform analog-to-digital conversion on the filtered third signal.
可选的，所述第三信号为三阶互调信号。Optionally, the third signal is a third-order intermodulation signal.
可选的，所述方法还包括：在检测到所述第三信号的功率大于预设门限值时，调整获取所述模拟信号时的偏置补偿电压，直至所述第三信号的功率不大于所述预设门限值Optionally, the method further includes: when detecting that the power of the third signal is greater than a preset threshold, adjusting an offset compensation voltage when acquiring the analog signal, until the power of the third signal is not Greater than the preset threshold
示例的，基于图3所示的本振泄漏信号的检测装置，假设无线***的工作频段为3400MHz-3600MHz，第二中频滤波电路可接收的信号频率为245MHz+/-200MHz；采用低本振配频方案时，所述本振信号的频率低于预设上变频后的射频信号频率，预设的本振信号的频率fLO＝3315MHz，该本振泄漏信号的检测方法包括以下步骤：For example, based on the detection device of the local oscillator leakage signal shown in FIG. 3, it is assumed that the operating frequency band of the wireless system is 3400 MHz-3600 MHz, and the signal frequency of the second intermediate frequency filter circuit can be received by 245 MHz +/- 200 MHz; In the solution, the frequency of the local oscillator signal is lower than the frequency of the preset up-converted radio frequency signal, and the frequency of the preset local oscillator signal is fLO=3315 MHz. The method for detecting the local oscillator leakage signal includes the following steps:
步骤501、数模转换电路21输出单音信号，并将所述单音信号发送给第一中频滤波电路22；Step 501, the digital-to-analog conversion circuit 21 outputs a tone signal, and transmits the tone signal to the first intermediate frequency filter circuit 22;
这里，所述单音信号的频率为fdac_IF＝168mhz，当设备天线口的额定功率为43dBm时，所述单音信号的单音幅度为-17dBFs。所述单音信号的频率设置的大小需要考虑第二中频滤波电路43可接收的信号的频率带宽，第二中频滤波电路43可接收的信号的频率应当低于第二中频滤波电路43的频率带宽。Here, the frequency of the tone signal is fdac_IF=168mhz, and when the power rating of the antenna port of the device is 43dBm, the tone amplitude of the tone signal is -17dBFs. The frequency setting of the tone signal needs to consider the frequency bandwidth of the signal that the second intermediate frequency filter circuit 43 can receive, and the frequency of the signal that the second intermediate frequency filter circuit 43 can receive should be lower than the frequency bandwidth of the second intermediate frequency filter circuit 43. .
步骤502、第一中频滤波电路22接收所述单音信号，对所述单音信号进行滤波获得滤波后的单音信号，并将所述滤波后的单音信号发送给调制电路23。Step 502: The first intermediate frequency filtering circuit 22 receives the single tone signal, filters the single tone signal to obtain a filtered tone signal, and sends the filtered tone signal to the modulation circuit 23.
步骤503、本振1产生本振信号，并将所述本振信号发送给调制电路23。Step 503: The local oscillator 1 generates a local oscillator signal, and sends the local oscillator signal to the modulation circuit 23.
这里，所述本振信号的本振频率fLO＝3315MHz。Here, the local oscillator frequency fLO of the local oscillator signal is 3315 MHz.
步骤504、调制电路23接收所述滤波后的单音信号和所述本振信号，根据所述本振信号将所述滤波后的单音信号进行上变频得到上变频后的单音信号和本振泄漏信号，并将所述上变频后的单音信号和本振泄漏信号发送给所述射频功率放大器3。Step 504: The modulation circuit 23 receives the filtered tone signal and the local oscillator signal, and up-converts the filtered tone signal according to the local oscillator signal to obtain an up-converted tone signal and a local The leakage signal is transmitted, and the up-converted tone signal and the local oscillation leakage signal are transmitted to the RF power amplifier 3.
这里，所述上变频后的单音信号的频率frf＝fdac_IF+fLO＝3483MHz，所述本振泄漏信号的频率为3315MHz，低于所述上变频后的单音信号的频率。 Here, the frequency of the up-converted tone signal frf=fdac_IF+fLO=3483MHz, and the frequency of the local oscillation leakage signal is 3315MHz, which is lower than the frequency of the up-converted tone signal.
步骤505、射频功率放大器3接收并放大所述上变频后的单音信号和本振泄漏信号，获取放大所述上变频后的单音信号和本振泄漏信号时产生的互调信号，从所述互调信号中选取三阶互调信号，并将所述三阶互调信号发送给小信号放大电路41。Step 505, the RF power amplifier 3 receives and amplifies the up-converted tone signal and the local oscillator leakage signal, and obtains an intermodulation signal generated when the up-converted tone signal and the local oscillator leakage signal are amplified. A third-order intermodulation signal is selected from the intermodulation signal, and the third-order intermodulation signal is sent to the small signal amplifying circuit 41.
这里，如图5所示，所述单音信号与所述本振泄漏信号的频率差Δf＝168MHz；所述三阶互调信号的频率fIM3＝2frf-fLO或者fIM3＝2fLO-frf，而频率为2frf-fLO的三阶互调信号的功率大于频率为2fLO-frf的三阶互调信号的功率，因此，选取频率为2frf-fLO的三阶互调信号作为检测信号并发送给小信号放大电路41，所述检测信号的频率为fIM3＝3651MHz。Here, as shown in FIG. 5, the frequency difference between the tone signal and the local oscillation leakage signal is Δf=168 MHz; the frequency of the third-order intermodulation signal is fIM3=2frf-fLO or fIM3=2fLO-frf, and the frequency The power of the third-order intermodulation signal of 2frf-fLO is greater than the power of the third-order intermodulation signal with the frequency of 2fLO-frf. Therefore, the third-order intermodulation signal with the frequency of 2frf-fLO is selected as the detection signal and sent to the small signal amplification. In circuit 41, the frequency of the detection signal is fIM3 = 3651 MHz.
步骤506、小信号放大电路41接收射频功率放大器3发送的三阶互调信号，对所述三阶互调信号进行放大并将放大后的三阶互调信号发送给解调电路42。Step 506: The small signal amplifying circuit 41 receives the third-order intermodulation signal sent by the radio frequency power amplifier 3, and amplifies the third-order intermodulation signal and sends the amplified third-order intermodulation signal to the demodulation circuit 42.
步骤507、解调电路42接收所述放大后的三阶互调信号，将所述放大后的三阶互调信号的频率下变频为预设频率，并将下变频后的三阶互调信号发送给第二中频滤波电路43。Step 507, the demodulation circuit 42 receives the amplified third-order intermodulation signal, down-converts the frequency of the amplified third-order intermodulation signal to a preset frequency, and converts the third-order intermodulation signal after down-conversion. It is sent to the second intermediate frequency filter circuit 43.
这里，所述上变频后的单音信号下变频后频率变为168MHz；所述本振泄漏信号经过下变频后频率变为零，零频信号不能被直接检测，而所述三阶互调信号经过下变频后频率变为fIM3_IF＝fIM3-fLO＝336MHz。Here, the down-converted tone signal has a frequency of 168 MHz after being down-converted; the frequency of the local oscillator leakage signal is zero after being down-converted, and the zero-frequency signal cannot be directly detected, and the third-order intermodulation signal is After down-conversion, the frequency becomes fIM3_IF=fIM3-fLO=336MHz.
步骤508、第二中频滤波电路43接收所述下变频后的三阶互调信号，对所述下变频后的三阶互调信号进行滤波并将滤波后的三阶互调信号发送给模数转换电路44。Step 508, the second intermediate frequency filter circuit 43 receives the down-converted third-order intermodulation signal, filters the down-converted third-order intermodulation signal, and sends the filtered third-order intermodulation signal to the modulus. Conversion circuit 44.
步骤509、模数转换电路44接收所述滤波后的三阶互调信号，对所述滤波后的三阶互调信号进行模数转换并将模数转换后的三阶互调信号发送给处理器5。Step 509, the analog-to-digital conversion circuit 44 receives the filtered third-order intermodulation signal, performs analog-to-digital conversion on the filtered third-order intermodulation signal, and sends the analog-to-digital converted third-order intermodulation signal to the processing. Device 5.
步骤510、处理器5接收所述模数转换后的三阶互调信号，并检测所述模数转换后的三阶互调信号的功率。Step 510: The processor 5 receives the third-order intermodulation signal after the analog-to-digital conversion, and detects the power of the third-order intermodulation signal after the analog-to-digital conversion.
假设无线***的工作频段为3400MHz-3600MHz，第二中频滤波电路可接收的信号频率为-245MHz+/-200MHz；采用高本振配频方案时，所述本振信号的频率高于预设上变频后的射频信号频率，预设的本振信号的频率fLO＝3775MHz，该本振泄漏信号的检测方法包括以下步骤：Assume that the working frequency band of the wireless system is 3400MHz-3600MHz, and the signal frequency that the second intermediate frequency filter circuit can receive is -245MHz +/- 200MHz; when the high local oscillator frequency matching scheme is adopted, the frequency of the local oscillator signal is higher than that of the preset up-conversion The frequency of the radio frequency signal, the frequency of the preset local oscillator signal fLO=3775MHz, the detection method of the local oscillator leakage signal includes the following steps:
步骤601、数模转换电路21输出单音信号，并经第一中频滤波电路22滤波后发送给调制电路23。Step 601, the digital-to-analog conversion circuit 21 outputs a tone signal, and is filtered by the first intermediate frequency filter circuit 22 and then sent to the modulation circuit 23.
这里，所述单音信号的频率为fdac_IF＝-168MHz，当设备天线口的额定功率 为43dBm时，所述单音信号的单音幅度为-17dBFs。Here, the frequency of the tone signal is fdac_IF=-168MHz, when the power rating of the antenna port of the device At 43 dBm, the tone amplitude of the tone signal is -17 dBFs.
步骤602、本振1产生本振信号，并将所述本振信号发送给调制电路23。Step 602: The local oscillator 1 generates a local oscillator signal, and sends the local oscillator signal to the modulation circuit 23.
这里，所述本振信号的本振频率fLO＝3775。Here, the local oscillator frequency fLO of the local oscillator signal is 3775.
步骤603、调制电路23根据所述本振信号将所述滤波后的单音信号进行上变频得到上变频后的单音信号和本振泄漏信号，并将所述上变频后的单音信号和本振泄漏信号发送给射频功率放大器3。Step 603, the modulation circuit 23 up-converts the filtered tone signal according to the local oscillator signal to obtain an up-converted tone signal and a local oscillation leakage signal, and the up-converted tone signal and The local oscillator leakage signal is sent to the RF power amplifier 3.
这里，所述上变频后的单音信号的频率frf＝fdac_If+fLO＝3607MHz，所述本振泄漏信号的频率为3775MHz，高于所述上变频后的单音信号的频率。Here, the frequency of the up-converted tone signal frf=fdac_If+fLO=3607 MHz, and the frequency of the local oscillation leakage signal is 3775 MHz, which is higher than the frequency of the up-converted tone signal.
步骤604、所述上变频后的单音信号和本振泄漏信号经过射频功率放大器3产生的互调信号，从所述互调信号中选取三阶互调信号，并将所述三阶互调信号经小信号放大电路41发送给解调电路42。Step 604, the up-converted tone signal and the local oscillator leakage signal pass through an intermodulation signal generated by the radio frequency power amplifier 3, select a third-order intermodulation signal from the intermodulation signal, and perform the third-order intermodulation signal. The signal is sent to the demodulation circuit 42 via the small signal amplifying circuit 41.
这里，如图6所示，所述单音信号与所述本振泄漏信号的频率差Δf＝-168MHz；所述三阶互调信号的频率fIM3＝2frf-fLO或者fIM3＝2fLO-frf，而频率为2frf-fLO的三阶互调信号的功率大于频率为2fLO-frf的三阶互调信号的功率，因此，选取频率为2frf-fLO的三阶互调信号即低端的三阶互调信号作为检测信号并经小信号放大电路41发送给解调电路42，所述检测信号频率为fIM3＝3439MHz。Here, as shown in FIG. 6, the frequency difference between the tone signal and the local oscillation leakage signal is Δf = -168 MHz; the frequency of the third-order intermodulation signal is fIM3 = 2frf - fLO or fIM3 = 2fLO - frf, and The power of the third-order intermodulation signal with the frequency of 2frf-fLO is greater than the power of the third-order intermodulation signal with the frequency of 2fLO-frf. Therefore, the third-order intermodulation signal with the frequency of 2frf-fLO is selected, that is, the third-order intermodulation of the low-end The signal is transmitted as a detection signal to the demodulation circuit 42 via the small signal amplifying circuit 41, and the frequency of the detection signal is fIM3 = 3439 MHz.
步骤605、解调电路42将放大后的三阶互调信号的频率下变频为预设频率，并将下变频后的三阶互调信号经第二中频滤波电路43滤波、模数转换电路44数模转换后发送给处理器5。Step 605: The demodulation circuit 42 down-converts the frequency of the amplified third-order intermodulation signal to a preset frequency, and filters the down-converted third-order intermodulation signal by the second intermediate frequency filter circuit 43 and the analog-to-digital conversion circuit 44. The digital to analog conversion is sent to the processor 5.
这里，所述本振泄漏信号经过下变频后频率变为零，零频信号不能被直接检测，而所述三阶互调信号经过下变频后频率变为fIM3_IF＝fIM3-fLO＝-336MHz。Here, the frequency of the local oscillator leakage signal after being down-converted becomes zero, and the zero-frequency signal cannot be directly detected, and the frequency of the third-order intermodulation signal is down-converted to become fIM3_IF=fIM3-fLO=-336 MHz.
步骤605、所述处理器接收所述模数转换后的三阶互调信号，并检测所述模数转换后的三阶互调信号的功率。Step 605: The processor receives the third-order intermodulation signal after the analog-to-digital conversion, and detects the power of the third-order intermodulation signal after the analog-to-digital conversion.
本领域内的技术人员应明白，本公开的实施例可提供为方法、***、或计算机程序产品。因此，本公开可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本公开可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。Those skilled in the art will appreciate that embodiments of the present disclosure can be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
本公开是参照根据本公开实施例的方法、设备(***)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。 可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
工业实用性Industrial applicability
本公开实施例提供的一种本振泄漏信号的检测装置，由于经过所述反馈链路的处理，本振泄漏信号的频率变为零，所述处理器不能检测出本振泄漏功率，但是互调信号的频率不为零，并且互调信号的功率与本振泄漏功率具有正线性相关的特性，因此，所述检测装置不需要改变现有链路设计，就可以通过检测所述互调信号的功率来表征所述本振泄漏信号的功率，与相关技术中在反馈链路上增加一个独立的本振或者增加一个辅本振和射频开关相比，降低了成本、简化了反馈链路设计。 A detecting device for a local oscillator leakage signal provided by the embodiment of the present disclosure, the frequency of the local oscillator leakage signal becomes zero due to the processing of the feedback link, and the processor cannot detect the local oscillator leakage power, but mutual The frequency of the modulated signal is not zero, and the power of the intermodulation signal has a positive linear correlation with the local leakage power. Therefore, the detecting device can detect the intermodulation signal without changing the existing link design. The power to characterize the power of the local oscillator leakage signal reduces the cost and simplifies the feedback link design by adding an independent local oscillator or adding a secondary local oscillator and the RF switch in the related art. .

Claims (10)

  1. 一种本振泄漏信号的检测装置，包括：本地振荡器、发射链路、射频功率放大器、反馈链路和处理器，其中，A detecting device for a local oscillator leakage signal includes: a local oscillator, a transmitting link, a radio frequency power amplifier, a feedback link, and a processor, wherein
    所述本地振荡器，设置为产生本振信号，并将所述本振信号发送给所述发射链路；The local oscillator is configured to generate a local oscillator signal and transmit the local oscillator signal to the transmit link;
    所述发射链路，设置为获取第一信号，根据接收到的本振信号将所述第一信号进行上变频得到第二信号，并将所述第二信号发送给所述射频功率放大器，所述第二信号包括上变频后的第一信号和本振泄漏信号；The transmitting link is configured to acquire a first signal, upconvert the first signal according to the received local oscillator signal to obtain a second signal, and send the second signal to the radio frequency power amplifier. The second signal includes the up-converted first signal and the local oscillator leakage signal;
    所述射频功率放大器，设置为接收并放大所述第二信号，获取放大所述第二信号时产生的互调信号，从所述互调信号中选取第三信号，并将所述第三信号发送给所述反馈链路；The radio frequency power amplifier is configured to receive and amplify the second signal, acquire an intermodulation signal generated when the second signal is amplified, select a third signal from the intermodulation signal, and select the third signal Sent to the feedback link;
    所述反馈链路，设置为接收所述第三信号，将所述第三信号进行处理并将处理后的第三信号发送给所述处理器；The feedback link is configured to receive the third signal, process the third signal, and send the processed third signal to the processor;
    所述处理器，设置为接收所述处理后的第三信号，并检测所述处理后的第三信号的功率。The processor is configured to receive the processed third signal and detect the power of the processed third signal.
  2. 根据权利要求1所述的装置，其中，所述发射链路包括：数模转换电路、第一中频滤波电路和调制电路，其中，The apparatus according to claim 1, wherein said transmission link comprises: a digital to analog conversion circuit, a first intermediate frequency filter circuit, and a modulation circuit, wherein
    所述数模转换电路，设置为获取模拟信号，并将所述模拟信号发送给所述第一中频滤波电路；The digital-to-analog conversion circuit is configured to acquire an analog signal, and send the analog signal to the first intermediate frequency filter circuit;
    所述第一中频滤波电路，设置为接收所述模拟信号，对所述模拟信号进行滤波获得第一信号，并将所述第一信号发送给所述调制电路；The first intermediate frequency filter circuit is configured to receive the analog signal, filter the analog signal to obtain a first signal, and send the first signal to the modulation circuit;
    所述调制电路，设置为接收所述第一信号和所述本地振荡器发送的本振信号，根据所述本振信号将所述第一信号进行上变频得到第二信号，并将所述第二信号发送给所述射频功率放大器。The modulating circuit is configured to receive the first signal and a local oscillator signal sent by the local oscillator, and upconvert the first signal according to the local oscillator signal to obtain a second signal, and Two signals are sent to the RF power amplifier.
  3. 根据权利要求1所述的装置，其中，所述反馈链路包括：小信号放大电路、解调电路、第二中频滤波电路和模数转换电路，其中，The apparatus according to claim 1, wherein said feedback link comprises: a small signal amplifying circuit, a demodulating circuit, a second intermediate frequency filtering circuit, and an analog to digital conversion circuit, wherein
    所述小信号放大电路，设置为接收所述射频功率放大器发送的第三信号，对所述第三信号进行放大并将放大后的第三信号发送给所述解调电路；The small signal amplifying circuit is configured to receive a third signal sent by the radio frequency power amplifier, amplify the third signal, and send the amplified third signal to the demodulation circuit;
    所述解调电路，设置为接收所述放大后的第三信号，将所述放大后的第三信号的频率下变频为预设频率，并将下变频后的第三信号发送给所述第二中频滤波电路；The demodulation circuit is configured to receive the amplified third signal, down-convert the frequency of the amplified third signal to a preset frequency, and send the down-converted third signal to the first Two intermediate frequency filter circuits;
    所述第二中频滤波电路，设置为接收所述下变频后的第三信号，对所述下 变频后的第三信号进行滤波并将滤波后的第三信号发送给所述模数转换电路；The second intermediate frequency filtering circuit is configured to receive the third signal after the down-conversion, for the next The frequency-converted third signal is filtered and the filtered third signal is sent to the analog-to-digital conversion circuit;
    所述模数转换电路，设置为接收所述滤波后的第三信号，对所述滤波后的第三信号进行模数转换并将模数转换后的第三信号发送给所述处理器。The analog-to-digital conversion circuit is configured to receive the filtered third signal, perform analog-to-digital conversion on the filtered third signal, and send the analog-to-digital converted third signal to the processor.
  4. 根据权利要求1所述的装置，其中，所述第三信号为三阶互调信号。The apparatus of claim 1 wherein said third signal is a third order intermodulation signal.
  5. 根据权利要求2所述的装置，其中，The device according to claim 2, wherein
    所述处理器，是设置为在检测到所述第三信号的功率大于预设门限值时，调整所述数模转换电路的偏置补偿电压，直至所述第三信号的功率不大于所述预设门限值。The processor is configured to adjust an offset compensation voltage of the digital-to-analog conversion circuit when the power of the third signal is greater than a preset threshold, until the power of the third signal is not greater than Preset thresholds.
  6. 一种本振泄漏信号的检测方法，包括：A method for detecting a local oscillator leakage signal includes:
    获取第一信号，根据产生的本振信号将所述第一信号进行上变频得到第二信号，所述第二信号包括上变频后的第一信号和本振泄漏信号；Obtaining a first signal, performing upconversion of the first signal according to the generated local oscillator signal to obtain a second signal, where the second signal includes the upconverted first signal and a local oscillator leakage signal;
    将所述第二信号放大，获取放大所述第二信号时产生的互调信号，从所述互调信号中选取第三信号；以及Amplifying the second signal to obtain an intermodulation signal generated when the second signal is amplified, and selecting a third signal from the intermodulation signal;
    将所述第三信号进行处理，检测处理后的第三信号的功率。The third signal is processed to detect the power of the processed third signal.
  7. 根据权利要求6所述的方法，其中，所述获取第一信号，根据产生的本振信号将所述第一信号进行上变频得到第二信号，包括：The method of claim 6, wherein the acquiring the first signal, upconverting the first signal according to the generated local oscillator signal to obtain the second signal comprises:
    获取模拟信号；Acquire an analog signal;
    对所述模拟信号进行滤波获得第一信号；Filtering the analog signal to obtain a first signal;
    根据产生的本振信号将所述第一信号进行上变频得到第二信号。The first signal is upconverted according to the generated local oscillator signal to obtain a second signal.
  8. 根据权利要求6所述的方法，其中，所述将所述第三信号进行处理，包括：The method of claim 6 wherein said processing said third signal comprises:
    对所述第三信号进行放大；Amplifying the third signal;
    将放大后的第三信号的频率下变频为预设频率；Downconverting the frequency of the amplified third signal to a preset frequency;
    对下变频后的第三信号进行滤波；Filtering the third signal after down-conversion;
    对滤波后的第三信号进行模数转换。Analog-to-digital conversion is performed on the filtered third signal.
  9. 根据权利要求6所述的方法，其中，所述第三信号为三阶互调信号。The method of claim 6 wherein said third signal is a third order intermodulation signal.
  10. 根据权利要求7所述的方法，还包括：The method of claim 7 further comprising:
    在检测到所述第三信号的功率大于预设门限值时，调整获取所述模拟信号时的偏置补偿电压，直至所述第三信号的功率不大于所述预设门限值。 When detecting that the power of the third signal is greater than a preset threshold, adjusting the offset compensation voltage when acquiring the analog signal until the power of the third signal is not greater than the preset threshold.
PCT/CN2016/103494 2016-06-27 2016-10-27 Method and device for detecting local oscillation signal WO2018000670A1 (en)

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