WO2020113928A1 - Appareil et procédé d'annulation adaptative de signaux d'intermodulation passifs - Google Patents

Appareil et procédé d'annulation adaptative de signaux d'intermodulation passifs Download PDF

Info

Publication number
WO2020113928A1
WO2020113928A1 PCT/CN2019/090978 CN2019090978W WO2020113928A1 WO 2020113928 A1 WO2020113928 A1 WO 2020113928A1 CN 2019090978 W CN2019090978 W CN 2019090978W WO 2020113928 A1 WO2020113928 A1 WO 2020113928A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
passive intermodulation
amplitude
intermodulation
circuit
Prior art date
Application number
PCT/CN2019/090978
Other languages
English (en)
Chinese (zh)
Inventor
孟庆南
Original Assignee
香港梵行科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201822014269.1U external-priority patent/CN209283217U/zh
Priority claimed from CN201811468365.1A external-priority patent/CN109995385B/zh
Application filed by 香港梵行科技有限公司 filed Critical 香港梵行科技有限公司
Publication of WO2020113928A1 publication Critical patent/WO2020113928A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver

Definitions

  • the invention relates to the field of wireless communication. Specifically, the present invention relates to an apparatus and method for adaptively canceling passive intermodulation signals.
  • wireless transceiver devices In communication systems, a large number of wireless transceiver devices are used.
  • the wireless transceiver equipment itself contains devices that generate passive intermodulation signals, such as RF duplexers, filters, combiners, etc.; the link from the antenna port of the wireless transceiver equipment to the antenna also contains many passive intermodulation signals.
  • Devices such as couplers, RF cables, tower-mounted amplifiers, etc.
  • the passive intermodulation signal level generated by the transmitting channel is as low as possible when the wireless transceiver equipment is working, so as to prevent the passive intermodulation signal from falling into the receiving channel and causing intermodulation interference to the receiving channel.
  • the current passive intermodulation cancellation technology generally has two ways:
  • Comparative document CN100490307C discloses an invention patent titled: "Signal Processing Circuit, Base Station and Method for Eliminating Intermodulation Products".
  • This patent divides the original carrier of the input non-linear unit into two channels, and inputs two branches respectively.
  • One original carrier passes through the non-linear unit to generate a processing signal containing the first set of intermodulation products
  • the second original carrier passes through the splitter, frequency multiplier, mixer and adjustment circuit.
  • Generate a control signal containing the second set of higher-order intermodulation products and finally superimpose the two signals. It uses the second set of high-order intermodulation and the first set of intermodulation products to have the same frequency, close to the same amplitude, and opposite phase to cancel the intermodulation signal.
  • the technical solution has the following shortcomings: 1.
  • the technical solution is not applicable to passive devices, it does not consider the difference of intermodulation values at different positions inside the nonlinear unit, this difference is very obvious for passive devices, in passive circuits
  • the amplitude attenuation and phase change of the transmitted signal are very large.
  • the intermodulation signal generated at the front end of the circuit will be greatly attenuated during signal transmission.
  • the intermodulation signal output by the circuit only contains the intermodulation signal generated at the end of the circuit. Therefore, for the duplexer In other words, if the signal is taken from the front end of the non-linear unit, the generated intermodulation cancellation signal cannot be canceled with the antenna port intermodulation signal; 2.
  • the intermodulation cancellation signal generated by this technical solution is the second group of high-order intermodulation
  • the product is limited to a fixed-order intermodulation product, which can only eliminate the intermodulation signal of the nonlinear unit in the corresponding frequency band, which has limitations.
  • Comparative document 201310048951.1 discloses an invention patent entitled "An Intermodulation Cancellation Device for Passive Devices". This patent directly couples the emission signal containing high-order intermodulation products from the output of the passive device. After the adjustment of the source regulator is transmitted to the end of the RF link with the intermodulation signal generator, it is adjusted again by the passive regulator to obtain the same frequency, level and opposite phase as the intermodulation signal transmitted by the passive device. The cancellation signal of the signal is superimposed on the output signal of the passive nonlinear unit through the coupler to achieve intermodulation cancellation.
  • the technical solution has the following disadvantages: 1.
  • the technical solution uses a passive regulator, amplitude adjustment and phase adjustment are passive devices, if you want to achieve amplitude adjustment and phase adjustment, you need to drive the passive regulator with the help of external force, such as using a motor drive , Or directly driven by manual, these methods will make the actual application cost high, and it is not easy to commercialize; 2. Because there is no feedback detection circuit for passive intermodulation cancellation results, the cancellation results cannot be monitored and adjusted in real time.
  • the present invention provides a digitally adaptive device for canceling passive intermodulation signals in a wireless transceiver system, so that it can connect the wireless transceiver device and the antenna port of the device to the antenna Passive intermodulation signals generated by other equipment or components on the road fall into the receiving frequency band to cancel the components.
  • the invention provides an apparatus for adaptively canceling passive intermodulation signals, which is characterized in that it includes a coupler, a canceller circuit, a passive intermodulation detection circuit, a digital processing unit, a duplexer, and a transmitting circuit unit, Antenna feeder component, antenna; one main access port of the coupler is connected to the antenna port of the duplexer, the other main access port is connected to the antenna feeder component on the antenna link, the coupling port of the coupler and the canceller
  • the radio frequency port of the circuit is electrically connected; the input end of the passive intermodulation detection circuit is electrically connected to the receiving port of the duplexer; the output end of the passive intermodulation detection circuit is electrically connected to the input end of the digital processing unit; and the digital processing unit
  • the transmission signal frequency discriminating circuit is electrically connected to the transmitting circuit unit, and the output terminal of the digital processing unit is electrically connected to the input terminals of the passive intermodulation detection circuit, the transmitting circuit unit and the canceller circuit, respectively; the output terminal
  • the signal of the transmitting circuit unit greater than a certain radio frequency power value causes the duplexer and its antenna link to generate a passive intermodulation signal, and some of the passive intermodulation signal falls into the receiving frequency band of the duplexer And the components with a certain frequency interval from the received signal;
  • the coupler couples the RF signal from the link of the antenna port of the duplexer to the canceller circuit; one main channel port of the coupler is connected to the antenna port of the duplexer, and the other main channel port is connected to The antenna feeder component connection on the antenna link, the coupling port of the coupler and the RF port of the canceller circuit are electrically connected;
  • the canceller circuit will use the transmitted signal from the radio frequency signal from the coupler to generate an intermodulation signal generator in the canceler circuit with the same frequency, different amplitude and different phase as the passive intermodulation signal in the radio frequency signal Intermodulation signal; after being reflected, the intermodulation signal passes through the amplitude adjustment and phase adjustment of the amplitude modulation phase modulator in the canceller circuit, and is coupled out to the main path of the coupler, forming a neutral drop with the passive intermodulation signal Intermodulation cancellation signals with the same frequency, the same amplitude and the opposite phase into the receiving frequency band and having a certain frequency interval from the received signal;
  • the passive intermodulation detection circuit amplifies the radio frequency signal after the receiving port of the duplexer through adjustable gain, down-converts, and finally converts it into a digital signal and inputs it into a digital processing unit.
  • the digital processing unit calculates the detected amplitude of the passive intermodulation signal according to the frequency information of the transmitted signal and compares it with the preset value of the passive intermodulation; according to the comparison result between the detected amplitude and the preset value,
  • the canceller circuit selects whether to generate an intermodulation cancellation signal; the digital processing unit generates a trigger signal and outputs it to the transmitting circuit unit to trigger the transmitting circuit unit to generate a radio frequency signal; the digital processing unit passes the multi-channel digital-to-analog converter and the canceller The circuit is connected, and the control amount of amplitude and phase is transferred to the canceller circuit.
  • the duplexer in the device represents a passive device in a wireless transceiver device; the antenna feed component and antenna represent a passive device in an antenna link of a wireless transceiver system, where the antenna feed component represents an antenna A combination of single or multiple passive devices in the link.
  • passive devices include but are not limited to cables, connectors, couplers, and combiners.
  • the canceller circuit will use the transmitted signal from the radio frequency signal from the coupler to generate the frequency of the passive intermodulation signal on the intermodulation signal generator in the canceller circuit with the radio frequency signal
  • the same, different amplitude and different phase intermodulation signals, and the intermodulation signal falls into a single 3rd-order component, or a single 5th-order component, or a single higher-order component of the receiving frequency band, or 3 of multiple different frequency points
  • the relationship with the passive intermodulation signal generated by the duplexer and its antenna link falls into a single third-order component, or a single fifth-order component, or a single higher-order component, or multiple different frequency points that fall into the receiving frequency band 3rd order component, or 5th order component at multiple different frequency points, or higher order component at multiple different frequency points,
  • the amplitude of the intermodulation signal generated by the power of the received signal and the passive intermodulation signal in the radio frequency signal coupled to the canceller circuit on the intermodulation signal generator is much smaller than the amplitude of the passive intermodulation signal, Does not affect the passive intermodulation cancellation results;
  • the intermodulation signal After being reflected, the intermodulation signal passes through the amplitude adjustment and phase adjustment of the amplitude modulation phase modulator in the canceller circuit, and is coupled to the main path of the coupler to form a passive intermodulation signal that falls into the receiving frequency band and An intermodulation cancellation signal with the same frequency, the same amplitude and opposite phase as the component with a certain frequency interval from the received signal, the intermodulation cancellation signal cancels the component in the passive intermodulation signal, and the canceled passive intermodulation signal Less than or equal to the preset value of passive intermodulation; at the same time, the transmitted and received signals in the duplexer and its antenna link operate normally in the duplexer and its antenna link.
  • the digital processing unit is used to detect the amplitude of the passive intermodulation signal according to the frequency information of the transmitted signal, and when the detected amplitude is greater than the preset value, control the canceller circuit to generate
  • the method for canceling out the intermodulation cancellation signal and the passive intermodulation signal in the radio frequency signal is as follows:
  • the digital processing unit first calculates the frequency information of the passive intermodulation signal related to it based on the frequency information of the transmitted signal, and converts it into the filtering parameter of the passive intermodulation signal, and then based on the received signal frequency and bandwidth information and The frequency and bandwidth information of the passive intermodulation signal is used to obtain the frequency interval between them, and then the corresponding digital filtering method and integration method are selected to finally realize the amplitude detection of the passive intermodulation signal; and then the passive intermodulation signal The detection amplitude of the signal is compared with the preset value of passive intermodulation;
  • the canceler circuit When the detected amplitude is less than or equal to the preset value, the canceler circuit does not generate an intermodulation cancellation signal, and does not affect the passive intermodulation index of the duplexer and its antenna link; when the When the detected amplitude is greater than the preset value, the adjustment of the amplitude and phase of the canceller circuit is controlled to produce the same frequency, amplitude and phase as the passive intermodulation signal of the duplexer and its antenna link
  • the opposite intermodulation cancellation signal cancels with the passive intermodulation signal in the radio frequency signal, and maintains the amplitude and phase of the canceller circuit in real time to adjust the amplitude and phase of the canceller circuit based on the detection result of the passive intermodulation signal so that the passive mutual modulation The working state where the modulation signal cancellation result is less than or equal to the preset value.
  • the digital processing unit obtains the transmission signal from the transmission circuit unit of the device through the transmission signal frequency discrimination circuit, converts it into a digital signal, and inputs the digital processing unit to perform frequency discrimination processing to obtain the relevant transmission signal frequency information, And the corresponding received signal frequency information is estimated from the duplex frequency interval between the transmitted signal and the received signal; or directly obtained from the input information of the device through the information interaction interface in the digital processing unit.
  • the signal that excites the duplexer and its antenna link to generate a passive intermodulation signal is the same as the signal that excites the intermodulation signal generator to generate an intermodulation signal, both of which originate from the transmitting circuit unit
  • the transmitted signal of the passive device so the passive intermodulation signal generated by the passive device and the intermodulation signal generated by the intermodulation signal generator have the same frequency and the same bandwidth
  • the antenna link is the link from the antenna port of the duplexer to the antenna Road
  • the antenna feed component represents a combination of single or multiple passive devices in the antenna link, and these passive devices include but are not limited to cables, connectors, couplers, and combiners
  • the transmitted signal is composed of multi-tone signals Constitute or consist of multi-carrier modulated signals.
  • the corresponding passive intermodulation component that can be generated by the intermodulation signal generator
  • the maximum amplitude of the frequency intermodulation cancellation signal is greater than the amplitude of a number of corresponding frequency components that fall into the receiving frequency band in the passive intermodulation signal of the duplexer and its antenna link; the intermodulation signal occurs The phase relationship between multiple specific order components in the intermodulation signal generated on the transmitter and the phase relationship between multiple specific order components
  • the passive intermodulation signal with a certain frequency interval from the received signal is generated by the duplexer or the antenna feeder component or the antenna that is generated by a single or multiple passive devices at the same time and superimposed, there are 3, 5 or
  • the higher-order components fall into the receiving band of the duplexer and all cause the passive intermodulation index tested from the receiving port of the duplexer to fail to meet the preset value requirements, in order to make the receiving port of the duplexer passive
  • the intermodulation value meets the requirements of the preset value and the cancellation capability of the device is greater than 20dB: the maximum amplitude of the intermodulation cancellation signal corresponding to the frequency of the passive intermodulation component that can be generated by the intermodulation signal generator is greater than the The amplitude of multiple corresponding frequency components falling into the receiving frequency band in the passive intermodulation signal of the duplexer and its antenna link; multiple specific orders in the intermodulation signal generated on the intermodulation signal generator
  • the amplitude relationship and phase relationship between the components are basically consistent with the amplitude relationship
  • the digital processing unit reduces the link gain of the passive intermodulation detection circuit to normally process the received signal and stop detecting passive intermodulation Signal amplitude
  • the digital processing unit processes the signal derived from the passive intermodulation detection circuit including the passive intermodulation signal and the reception There is a frequency separation between the signal and the passive intermodulation signal and the received signal.
  • the method for the digital processing unit to calculate the amplitude of the passive intermodulation signal is:
  • the digital processing unit first calculates the frequency information of the passive intermodulation signal related to it based on the frequency information of the transmitted signal,
  • bandwidth information and passive intermodulation signal frequency bandwidth information to obtain the frequency interval between them, and according to the frequency interval to select an appropriate algorithm to calculate the passive intermodulation signal amplitude
  • the algorithm for calculating the amplitude of the passive intermodulation signal includes but is not limited to the direct filter integration method and the segmented filter integration method;
  • the direct filtering integration method refers to directly digitally filtering and integrating the amplitude based on the bandwidth of the passive intermodulation signal, at which time the frequency interval between each order component of the passive intermodulation signal falling into the receiving frequency band and the receiving signal To be greater than or equal to the passive intermodulation signal in the digital filtering algorithm of the digital filter passband to stopband transition band bandwidth, this frequency interval is the basis of the direct filter integration method;
  • the segmented filtering integration method refers to dividing the bandwidth of the passive intermodulation signal into several sub-bandwidths, performing digital filtering and integrating to obtain the amplitude according to each sub-bandwidth, and then accumulating the amplitudes corresponding to all the sub-bandwidths to obtain the entire signal amplitude.
  • this frequency interval is the use of segmented filter integration The basis of law.
  • the canceller circuit is connected to the antenna link behind the duplexer antenna port through a coupler; a main access port of the coupler is connected to the duplexer antenna port and the distance needs to be controlled from 0 to 1.
  • the specific length is determined by the best effect of passive intermodulation cancellation;
  • the other main channel port of the coupler is connected to the antenna feed component, and the coupling port of the coupler is connected to the canceler circuit;
  • the insertion loss of the coupler is less than 0.2 dB
  • the coupling degree of the coupler ranges from 25dB to 45dB
  • the coupling port of the coupler is a forward coupling port relative to the transmitted signal
  • the carrying power of the coupler must be greater than the maximum transmit power peak of the device
  • the bandwidth of the coupler includes the transmit frequency band ,
  • the receiving frequency band and the duplex interval between the two, the gain fluctuation in the frequency band of the coupler is related to the transmitting frequency band and the receiving frequency band and needs to be within a certain threshold range;
  • the passive intermodulation detection circuit includes a low-noise amplifier, a down-conversion module, and a high-speed analog-to-digital converter.
  • the input terminal of the noise amplifier is electrically connected to the receiving port of the duplexer, and the output terminal of the noise amplifier passes through the down-conversion module. It is electrically connected to the input end of the high-speed analog-to-digital converter, and the output end of the high-speed analog-to-digital converter is electrically connected to the input end of the digital processing unit; the gain of the passive intermodulation detection circuit is preset by the required passive intermodulation 3.
  • the minimum sampling power and link noise figure of the high-speed analog-to-digital converter in the passive intermodulation detection circuit are determined; the maximum value of the received signal power of the passive intermodulation detection circuit is greater than or equal to the actual communication standard of the device The specified maximum received signal power.
  • the digital processing unit is connected to the canceller circuit through a multi-channel digital-to-analog converter, and transmits the control amounts of amplitude and phase to the canceller circuit.
  • the amplitude adjustment accuracy and phase adjustment accuracy of the canceller circuit The requirements are mainly derived from the need for passive intermodulation signal cancellation capabilities;
  • the digital processing unit includes at least a logic processing and arithmetic processing device with a digital signal processing function for digital signal reception, algorithm processing, digital signal output, control and configuration signal output, the logic processing and arithmetic processing device Including but not limited to field programmable gate array device, central processor, digital signal processor; the hardware composition of the information interaction interface of the digital processing unit includes but not limited to Ethernet interface, optical fiber interface, RS-485 bus interface; The number of digits of the digital-to-analog converter in the digital processing unit ranges from 10 to 18 bits, and there are at least three digital-to-analog converters;
  • At least two interfaces are provided between the digital processing unit and the passive intermodulation detection circuit: one interface is used to obtain the sampling signal of the high-speed analog-to-digital converter in the passive intermodulation detection circuit, thereby performing the passive intermodulation signal Digital filtering and amplitude calculation; the function of another interface is to configure the parameters of the passive intermodulation detection circuit through the bus, such as local oscillator frequency and amplifier gain.
  • the bus includes but is not limited to I2 bus and SPI bus;
  • An interface is also provided between the digital processing unit and the transmission signal frequency discrimination circuit 1 for configuring the parameters of the transmission signal frequency discrimination circuit 1 through the bus, such as local oscillator frequency and link gain.
  • the bus includes but is not limited to the I2 bus , SPI bus;
  • the digital processing unit is provided with at least one information interaction interface, and its functions include but are not limited to program download, configuration information input, remote alarm and maintenance;
  • the configuration information that needs to be input includes the transmission signal bandwidth and frequency band of the device, the reception signal bandwidth and frequency band , The order and frequency band information of the main interference components in the passive intermodulation signal, the preset value of the passive intermodulation signal and the time-varying curve, the maximum number of cancellations;
  • the digital processing unit can obtain the transmitted signal through the information interaction interface Frequency information and received signal frequency information;
  • the information interaction interface can also perform data interaction with Internet background resources: upload the passive intermodulation value during the operation of the device, and the experience curve of the passive intermodulation value changing with time, And the status information of each module circuit in the passive intermodulation signal adaptive cancellation device; or download the comprehensively optimized preset value of the passive intermodulation signal and the time-varying curve.
  • one end of the AM phase modulator in the canceller circuit is directly connected to the coupling port of the coupler, or is connected to the coupling port of the coupler through an RF switch, and the other end is connected to an intermodulation signal generator.
  • the amplitude modulation phase modulator includes an amplitude modulation circuit and a phase modulation circuit; wherein the amplitude modulation circuit is composed of an adjustable attenuator and a fixed attenuator; the phase modulation circuit 2 includes at least two adjustable phase shifters; digital The output end of the processing unit is electrically connected to the input terminals of the amplitude modulation circuit and the phase modulation circuit; the amplitude adjustment range of the amplitude modulation phase modulator is greater than 30dB and the phase adjustment range is greater than 180 degrees; the load of the amplitude modulation phase modulator in the canceler circuit The power is greater than or equal to the load-bearing power threshold of the canceller circuit, the working frequency band of the amplitude modulation phase modulator includes the transmission frequency band and the reception frequency band of the duplexer, the gain fluctuation and the transmission frequency band within the frequency band of the amplitude modulation phase modulator, The receiving frequency band is related and needs to be within a certain threshold.
  • one end of the second amplitude modulation circuit 3 in the canceller circuit is connected through the coupling port of the first circulator and the coupler, or may be connected through the coupling port of the first circulator and the RF switch and the coupler;
  • One end is connected to the intermodulation signal generator through the second circulator;
  • one end of the amplitude modulation phase modulator in the canceler circuit is connected to the intermodulation signal generator through the second circulator;
  • the other end is connected to the coupler through the first circulator
  • the coupling port is connected, or may be connected to the coupling port of the coupler through the first circulator and the radio frequency switch.
  • the amplitude modulation circuit allows the intermodulation signal generator to withstand a radio frequency signal of an appropriate power;
  • the amplitude modulation phase modulator includes an amplitude modulation circuit and a phase modulation circuit, which performs the intermodulation signal generated by the intermodulation signal generator Amplitude modulation and phase modulation processing to cancel the passive intermodulation signals generated by the duplexer and its antenna link in the device;
  • the amplitude modulation phase modulator includes an amplitude modulation circuit and a phase modulation circuit; the output ends of the digital processing unit are It is electrically connected to the input terminals of the amplitude modulation circuit, the second amplitude modulation circuit, and the phase modulation circuit;
  • the amplitude modulation circuit includes at least one adjustable attenuator;
  • the phase modulation circuit includes at least two adjustable phase shifters; and the amplitude modulation circuit It is composed of fixed attenuator or adjustable attenuator;
  • the frequency bandwidth of the first circulator and the second circulator 5 includes the transmission frequency band and
  • the intermodulation signal generator includes, but is not limited to, a single diode, a single transistor, or multiple diodes in parallel; the specific model of the diode or the specific model of the transistor and the amplitude of the intermodulation signal of the third-order, fifth-order, or higher-order intermodulation signal
  • the value characteristic and the phase characteristic are related.
  • the requirements of the amplitude characteristic and the phase characteristic are the requirements of the intermodulation signal generator; when multiple diodes of the same type are connected in parallel, the strength of the intermodulation signal will be enhanced; the load of the intermodulation signal generator
  • the power is greater than or equal to the difference between the power threshold of the canceller circuit and the link loss from the radio frequency input port of the canceller circuit to the intermodulation signal generator.
  • the passive intermodulation detection circuit includes at least a low noise amplifier, a down conversion module, and a high-speed analog-to-digital converter; the passive intermodulation detection circuit is connected to the digital processing unit through a high-speed analog-to-digital converter ;
  • the down-conversion module can convert the received radio frequency signal into an intermediate frequency signal, or convert the received radio frequency signal into a zero intermediate frequency signal;
  • sampling dynamic range of the high-speed analog-to-digital converter must be greater than the difference between the maximum power value of the received signal and the power value corresponding to the preset value of passive intermodulation,
  • the minimum power that the passive intermodulation detection circuit can sample is less than or equal to the passive intermodulation power value corresponding to the preset value, and at the same time, the circuit can adjust the link gain according to the amplitude of the total power of the received radio frequency signal to avoid receiving the signal Or other signals, link blocking; the gain of the passive intermodulation detection circuit is preset by the required passive intermodulation, the minimum sampling power of the high-speed analog-to-digital converter in the passive intermodulation detection circuit, and the link noise The coefficient is determined; the maximum value of the received signal power of the passive intermodulation detection circuit is greater than or equal to the maximum received signal power specified by the communication standard corresponding to the device.
  • the passive intermodulation detection circuit includes a low-noise amplifier, a radio frequency filter and small signal amplification unit, a mixer, an intermediate frequency filter, an intermediate frequency amplifier, an analog-to-digital converter, a local oscillator and a frequency mixer, which are electrically connected in sequence. It is electrically connected; the input end of the low-noise amplifier is electrically connected to the output end of the duplexer; the output end of the analog-to-digital converter is electrically connected to the input end of the digital processing unit.
  • the passive intermodulation detection circuit includes a low-noise amplifier, a radio frequency filtering and small-signal amplifying unit and a down-conversion and analog-to-digital conversion unit that are electrically connected in sequence; the input end of the low-noise amplifier is electrically connected to the output end of the duplexer Connection; the output of the down-conversion and analog-to-digital conversion unit is electrically connected to the input of the digital processing unit.
  • the present invention provides a digital wireless transceiver device, including a device for adaptively canceling passive intermodulation signals.
  • the duplexer of the device for adaptively canceling passive intermodulation signals is a duplexer of wireless transceiver equipment;
  • the passive intermodulation detection circuit of the device for adaptively canceling the passive intermodulation signal multiplexes the components or units of the receiving link of the wireless transceiver equipment, or adds a passive intermodulation detection circuit in the wireless transceiver equipment;
  • the device for adaptively canceling passive intermodulation signals The component or unit of the transmission circuit unit of the device multiplexes the transmission link of the wireless transceiver equipment; the digital processing unit of the device for adaptively canceling passive intermodulation signals multiplexes the wireless Components or units of the digital processing unit of the transceiver device, or a new digital processing unit added to the wireless transceiver device, the digital processing unit is integrated into the overall program of the wireless transceiver device; the adaptive cancellation passive intermodulation The couple
  • the coupling port of the coupler is a forward coupling port relative to the signal transmitted by the wireless transceiver device; the canceler circuit of the device for adaptively canceling passive intermodulation signals needs to be in the wireless Newly added in the transceiver equipment, and the RF port and the coupling port of the coupler are directly connected, the amplitude adjustment and phase adjustment of the canceller circuit are realized by the amplitude and phase control parameters calculated by the digital processing unit; the adaptive cancellation passive mutual Signal modulation device
  • the antenna feed component and antenna of the device are the corresponding components and antennas on the antenna link of the wireless transceiver device;
  • each antenna port of the duplexer in each transceiver link is immediately adjacent to a coupler and a canceller circuit.
  • the invention provides a method for adaptively canceling passive intermodulation signals in a wireless transceiver system, characterized in that the method includes the following steps,
  • S1 Obtain the transmitted signal bandwidth and frequency band, the received signal bandwidth and frequency band, the order and frequency band information of the main interference components in the passive intermodulation signal, the expected passive intermodulation preset value and the time-varying through the digital processing unit The initial empirical data of the curve, amplitude and phase, the maximum number of cancellations and other information, and converted into the corresponding configuration parameters;
  • step S2 According to the configuration parameters of the transmitted signal in step S1, the digital processing unit obtains the frequency point of the passive intermodulation signal and converts it into the corresponding digital filtering parameter and stores it in the parameter configuration table;
  • the digital processing unit samples the passive intermodulation detection circuit according to the configuration parameters of the received signal, the configuration parameters of the passive intermodulation signal in step S1, and the digital filtering parameters of the passive intermodulation signal obtained in step S2
  • the signal is digitally filtered to filter out other signal components except the passive intermodulation signal, and the amplitude value of the passive intermodulation signal that falls into the receiving frequency band is obtained;
  • the algorithm for determining the amplitude value includes but is not limited to segmented integration Method, direct integration method based on signal bandwidth;
  • step S4 determine the current working state; the default value of the state identification of the working state is: "initial working mode”; if the state identification value of the working state is "initial working mode", continue to step S5-1, otherwise continue to step S5-2 ;
  • step S5-1 Compare the passive intermodulation signal amplitude value obtained in step S3 with the passive intermodulation preset value in step S1 to determine whether the passive intermodulation signal amplitude is less than or equal to the passive intermodulation preset value;
  • step S6 If the judgment result of step S5-1 is "Yes", the canceller circuit continues to maintain the high isolation state of the link between the intermodulation signal generator and the coupler; and returns to step S2;
  • step S7 If the judgment result of step S5-1 is "No", the canceller circuit is switched to the low isolation state of the link between the intermodulation signal generator and the coupler; and the state identification value of the working state is set to " Offset working status"; continue to step S8;
  • step S5-2 Compare the amplitude value of the passive intermodulation signal obtained in step S3 with the preset value of the passive intermodulation signal in step S1 to determine whether the amplitude of the passive intermodulation signal is less than or equal to the preset value of passive intermodulation; If the judgment result of step S5-2 is "Yes”, then maintain the state and return to step S2; if the judgment result of step S5-2 is "No", then execute step S8;
  • step S8 Calculate the amplitude and phase adjustment values of the canceller circuit according to the amplitude value of the passive intermodulation signal in step S3; and distribute to the amplitude modulator and phase modulator in the canceller circuit to implement cancellation; after completing the current round of cancellation processing After that, it will continue to return to step S2 to continue the next round of cancellation processing; the algorithm for determining the amplitude and phase adjustment values includes but is not limited to a two-dimensional minimum variance algorithm.
  • the invention can be applied to digital wireless transceiver equipment and its antenna link in order to counteract the unqualified passive intermodulation generated by passive devices, so that the passive intermodulation index of the wireless transceiver equipment and its antenna link meets the passive intermodulation preset Value; and when multiple wireless transceiver devices are used at the same time and the antenna link of each device is connected through the combiner to connect the antenna, the device corresponding to each antenna link can also cancel the
  • the unqualified passive intermodulation generated by the source device makes the passive intermodulation index of the wireless transceiver device and its antenna link meet the preset value of passive intermodulation;
  • the digital wireless transceiver device includes but is not limited to a remote radio unit,
  • the antenna link includes but is not limited to cables, connectors, couplers, combiners, and antennas.
  • the invention can pass the passive intermodulation signal generated by the wireless transceiver device and the passive intermodulation signal generated by any device or component in the link behind the antenna port of the wireless transceiver device into the radio frequency of the component of the receiving frequency band in the wireless transceiver device The link is cancelled, and a result that is better than a predetermined passive intermodulation requirement index is obtained at the receiving port of the passive device.
  • the present invention makes it possible to reduce the passive intermodulation index requirements for each device in the wireless transceiver system while keeping the system passive intermodulation index unchanged, thereby reducing the manufacturing cost of each passive device.
  • the above effect can also be used to eliminate the effect of deterioration of the passive intermodulation index due to the increase in working time of the components or antennas on the duplexer or its antenna link, thereby extending the life cycle of the wireless transceiver system.
  • the present invention can also increase the index to a value above a preset value when the system needs a better passive intermodulation index; when the passive intermodulation of the duplexer of the wireless transceiver device and its antenna link cancels and is in place When the receiving port of the duplexer obtains a result that is better than a predetermined passive intermodulation requirement index, it will not adversely affect the linear performance of the transmitted signal and the linear performance of the received signal.
  • the invention adopts an active intermodulation cancellation circuit, the adjustment of the signal phase and amplitude can be quantified, and the adjustment accuracy and precision are improved.
  • the present invention uses a feedback link for passive intermodulation signal cancellation effect, so that the passive intermodulation signal cancellation effect can be monitored in real time and adaptively adjusted dynamically, so as to pass through the passive device or subsequent link
  • the power level, operating frequency of the signal changes, and the ambient temperature changes it can respond dynamically and in real time to make the passive intermodulation signal cancellation result meet the expected target value. This has important practical significance.
  • Figure 1 is a schematic diagram of the present invention.
  • FIG. 2 is a schematic diagram of the first structure of the canceller circuit B in the embodiment of the present invention.
  • FIG 3 is a schematic diagram of a second structure of the canceller circuit B in the embodiment of the present invention.
  • FIG. 4 is a schematic diagram of the superheterodyne structure of the passive intermodulation detection circuit D in the embodiment of the present invention.
  • FIG. 5 is a schematic diagram of the structure of the receiving zero intermediate frequency of the passive intermodulation detection circuit D in the embodiment of the present invention.
  • FIG. 6 is a flowchart of a method for adaptively canceling passive intermodulation signals in a wireless transceiver system according to an embodiment of the present invention.
  • Table 1 is a passive intermodulation cancellation test record of the device of the embodiment of the present invention.
  • FIG. 8 is a diagram of the cancellation effect of the fifth-order component after the cancellation of the third-order component of the device of the embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a wireless transceiver device with an adaptive cancellation passive intermodulation signal function according to an embodiment of the present invention.
  • FIG. 10 is a diagram of the cancellation effect of the third-order component after the embodiment of the present invention is applied to a wireless transceiver device.
  • FIG. 11 is an ACPR test result diagram of a low-frequency point signal in a dual-carrier transmission signal when the passive intermodulation cancellation function is not turned on after being used in a wireless transceiver device according to an embodiment of the present invention.
  • FIG. 12 is an ACPR test result diagram of a high-frequency point signal in a dual-carrier transmission signal when the passive intermodulation cancellation function is not turned on after being used in a wireless transceiver device according to an embodiment of the present invention.
  • FIG. 13 is an ACPR test result diagram of a low-frequency point signal in a dual-carrier transmission signal when a passive intermodulation cancellation function is enabled after a wireless transceiver device is used in an embodiment of the present invention.
  • FIG. 14 is an ACPR test result diagram of a high-frequency point signal in a dual-carrier transmission signal when the passive intermodulation cancellation function is turned on after the wireless transceiver device is used in an embodiment of the present invention.
  • 16 is an EVM test result diagram of a high-frequency point signal when the passive intermodulation cancellation function is not enabled after the wireless transceiver device according to an embodiment of the present invention is used, and then the received signal is looped back to the transmit link.
  • FIG. 17 is an EVM test result diagram of a low-frequency point signal when the passive intermodulation cancellation function is turned on after the wireless transceiver device is used in the embodiment of the present invention, and then the received signal is looped back to the transmit link.
  • 19 is a schematic structural diagram of a wireless repeater capable of adaptively canceling passive intermodulation signals according to an embodiment of the present invention.
  • 20 is a schematic diagram of one example of use of a wireless transceiver device and multiple transceiver links in an embodiment of the present invention.
  • 21 is a schematic diagram of one example of use of a wireless transceiver device having multiple transceiver links in an embodiment of the present invention
  • the present invention relates to an apparatus for adaptively canceling passive intermodulation signals, which includes a coupler A, a canceler circuit B, a passive intermodulation detection circuit D, a digital processing unit E, and a duplexer A0, transmitting circuit unit F, antenna feeder component A2, antenna A1;
  • the duplexer A0 in the device represents a passive device in the wireless transceiver equipment;
  • the antenna feeder component A2 and the antenna A1 represent the antenna chain of the wireless transceiver system Passive devices in the circuit, where the antenna feed component A2 represents a combination of single or multiple passive devices in the antenna link.
  • These passive devices include but are not limited to cables, connectors, couplers, and combiners.
  • a transmission signal of the transmission circuit unit F greater than 40 dBm is composed of a multi-tone signal or a multi-carrier modulation signal.
  • the above-mentioned transmission signal causes the duplexer A0 and the antenna feed component A2 or antenna A1 on the antenna link to generate a passive intermodulation signal, and some of the passive intermodulation signals fall into the receiving band of the duplexer A0
  • the component with a certain frequency interval from the received signal, according to the different configuration of the transmitted signal the component of the passive intermodulation signal that falls into the receiving band of the duplexer A0 contains a single third-order component, or a single fifth-order component, or even A single higher-order component, or multiple third-order components of different frequencies, or multiple fifth-order components of different frequencies, or even multiple higher-order components of different frequencies, or both a third-order component and a fifth-order component or even high Order component; when only a single 3rd order, or a single 5th order or a single higher order component of the above-
  • the coupler A couples the radio frequency signal from the link of the antenna port of the duplexer A0 to the canceler circuit B;
  • the radio frequency signal includes a transmission signal, a passive intermodulation signal, and a reception signal;
  • the coupler A One main path port is connected to the antenna port of the duplexer A0, the other main path port is connected to the antenna feed component A2 on the antenna link, the coupling port of the coupler A and the radio frequency port of the canceller circuit B;
  • the distance between the antenna port of the coupler A and the duplexer A0 needs to be controlled within the range of 0 to 1 meter, and the specific length is determined by the best effect of passive intermodulation cancellation.
  • the other main channel port of coupler A is connected to antenna feed component A2, and the coupling port of coupler A is connected to canceler circuit B; the insertion loss of coupler A is less than 0.2dB, and the coupling degree of coupler A ranges from 25dB to 45dB.
  • the coupler A is close to the antenna port of the duplexer A0, that is, the distance is 0 meters.
  • the canceller circuit B will use the transmission signal from the radio frequency signal from the coupler A to generate on the intermodulation signal generator B2 the same frequency, different amplitude and amplitude as the passive intermodulation signal in the radio frequency signal Intermodulation signals with different phases, and the intermodulation signal in the intermodulation signal falls into a single third-order component, or a single fifth-order component, or a single higher-order component, or multiple third-order components at different frequencies, or more 5th-order components at different frequency points, or higher-order components of multiple different frequency points, or there are simultaneous 3rd-order components, 5th-order components and even higher-order components.
  • the intermodulation cancellation signal and the passive intermodulation signal The components are cancelled, and the passive intermodulation signal after cancellation is less than or equal to the preset value of passive intermodulation; at the same time, the transmitted and received signals in the duplexer A0 and its antenna link are in the duplexer A0 and its antenna link Normal operation; in addition, the maximum amplitude of the intermodulation cancellation signal that the intermodulation signal generator B2 can generate is greater than that of the passive intermodulation signal of the duplexer A0 and its antenna link. The amplitude of a single component of the corresponding frequency of the receiving band.
  • the intermodulation signal generator B2 when actually selecting the specific device that constitutes the intermodulation signal generator B2, the intermodulation signal generator B2 should generate the same frequency and different amplitude as the passive intermodulation signal in the radio frequency signal.
  • the passive intermodulation signal generated by the duplexer A0 and its antenna link falls into a single 3rd-order component, or a single 5th-order component, or a single higher-order component of the receiving frequency band, or a third-order of multiple different frequency points Components, or 5th-order components at multiple different frequency points, or higher-order components at multiple different frequency points, or there
  • the amplitude adjustment and phase adjustment of the AM phase modulator B1 are realized by the amplitude and phase control parameters calculated by the digital processing unit E; and the calculation of the amplitude and phase control parameters of the digital processing unit E requires The sampling signal of the passive intermodulation detection circuit D.
  • one of the functions of the passive intermodulation cancellation function is to reduce the passive intermodulation index requirements for the passive device
  • the second role is to eliminate the deterioration of the passive intermodulation index of the passive device with the increase of working time, and the third role is to improve the passive intermodulation index of the passive device;
  • the passive intermodulation detection circuit D is used to amplify the radio frequency signal after the receiving port of the duplexer A0 with adjustable gain, down-convert, and finally convert it into a digital signal and input it to the digital processing unit E.
  • the radio frequency port of the passive intermodulation detection circuit D is directly connected to the receiving port of the duplexer A0.
  • the radio frequency signal obtained by the circuit contains components of the received signal and the passive intermodulation signal that fall into the receiving frequency band, and the circuit receives
  • the dynamic range is greater than the difference between the maximum power value of the received signal and the power value corresponding to the preset value of passive intermodulation;
  • the passive intermodulation detection circuit D is connected to the digital processing unit E through a high-speed analog-to-digital converter
  • the sampling rate of the high-speed analog-to-digital converter is greater than or equal to 2 times the duplexer A0 receiving band bandwidth.
  • the digital processing unit E When the radio frequency signal in the passive intermodulation detection circuit D is too large and the link is blocked, the digital processing unit E will reduce the link gain of the passive intermodulation detection circuit D to process the received signal normally and stop detecting the passive intermodulation signal Amplitude; when the passive intermodulation detection circuit D is not blocked, the digital processing unit E needs to process the signal from the passive intermodulation detection circuit D in the process of calculating the passive intermodulation amplitude
  • the passive intermodulation signal and the received signal and there is a certain frequency interval between the passive intermodulation signal and the received signal; the method of calculating the amplitude of the passive intermodulation signal is: the digital processing unit E first calculates the Relevant frequency information of passive intermodulation signal, then according to the received signal frequency, bandwidth information and passive intermodulation signal frequency, bandwidth information to find the frequency interval between them, and select an appropriate algorithm to calculate the passive according to the frequency interval
  • the amplitude of the intermodulation signal; the algorithm for calculating the amplitude of the passive intermodulation signal
  • the frequency interval between each order component of the passive intermodulation signal falling into the receiving frequency band and the received signal should be greater than or equal to the digital filter algorithm of the passive intermodulation signal.
  • the bandwidth of the transition band to the stop band, this frequency interval is the basis of the direct filter integration method; the segmented filter integration method refers to dividing the passive intermodulation signal bandwidth into several sub-bandwidths, and performing digital filtering according to each sub-bandwidth Integrate to find the amplitude, and then accumulate the amplitudes corresponding to all sub-bandwidths to obtain the entire signal amplitude.
  • the frequency interval between each order component and the received signal should be greater than or equal to the number of the side subband signals of each order component
  • the bandwidth of the transition band from the pass band of the filter to the stop band, and this frequency interval is the basis of the segmented filtering integration method.
  • the digital processing unit E first calculates the frequency information of the passive intermodulation signal related to it based on the frequency information of the transmitted signal, and converts it into the filtering parameter of the passive intermodulation signal, and then based on the received signal frequency and bandwidth information Obtain the frequency interval between them with the frequency and bandwidth information of the passive intermodulation signal, and then select the corresponding digital filtering method and integration method to finally realize the amplitude detection of the passive intermodulation signal; and then the passive intermodulation signal
  • the detected amplitude of the modulated signal is compared with the preset value of passive intermodulation: when the detected amplitude is less than or equal to the preset value, the canceller circuit B does not generate an intermodulation cancellation signal, and the duplex A0 and the passive intermodulation index of its antenna link have an impact; when the detected amplitude is greater than the preset value, the cancellation circuit B is controlled to adjust its amplitude and phase
  • the passive intermodulation signals with the same frequency, the same amplitude and the opposite phase of the passive intermodulation
  • One method for the digital processing unit E to obtain the transmitted signal frequency information and the received signal frequency information is to use the transmitted signal discriminator circuit E1 to obtain the transmitted signal from the transmitting circuit unit F of the device, convert it into a digital signal, and input
  • the digital processing unit E performs frequency discrimination processing to obtain relevant transmission signal frequency information, and estimates the corresponding reception signal frequency information from the duplex frequency interval between the transmission signal and the reception signal; acquiring the transmission signal frequency information and the reception signal frequency information
  • Another method is to obtain directly from the input information of the device through the information interaction interface in the digital processing unit E.
  • the canceler circuit B is connected to the antenna link behind the antenna port of the duplexer A0 through the coupler A; a main path port of the coupler A is connected to the antenna port of the duplexer A0, that is, the distance is 0 meters, the other main channel port of coupler A is connected to antenna feed component A2, the coupling port of coupler A is connected to canceler circuit B; the insertion loss of coupler A is less than 0.2dB, the coupling degree range of coupler A It is about 30dB, and the coupling port of coupler A is a forward coupling port relative to the transmitted signal.
  • the load power of coupler A must be greater than the maximum transmit power peak of the device.
  • the bandwidth of coupler A includes the transmit frequency band, the receive frequency band and the duplex interval between the two.
  • the passive intermodulation index of coupler A is equivalent to the passive intermodulation index requirement of antenna feeder A2;
  • the load-carrying power threshold of the canceler circuit B needs to be greater than or equal to the coupling
  • the minimum value of signal power must be greater than a certain power threshold.
  • the average power carried by coupler A is greater than 100 watts and the peak power carried is greater than 1000 watts; the passive intermodulation index of coupler A is -117 dBm/Hz; the average power gate carried by the canceler circuit B
  • the limit value is greater than or equal to 20dBm and the peak power threshold value is greater than or equal to 30dBm; in order to enable the intermodulation signal generator B2 in the canceler circuit B to generate a passive intermodulation cancellation signal, the transmit signal loaded on the canceler circuit B
  • the minimum power must be greater than 10 watts.
  • the radio frequency port of the passive intermodulation detection circuit D is connected to the receiving port of the duplexer A0, so as to obtain the components of the received signal and the passive intermodulation signal falling into the receiving frequency band, and the reception dynamics of the passive intermodulation detection circuit D
  • the range is greater than the difference between the maximum power value of the received signal and the power value corresponding to the preset value of passive intermodulation.
  • the receiving dynamic range of the passive intermodulation detection circuit D is greater than 70dB; passive intermodulation
  • the detection circuit D is connected to the digital processing unit E through a high-speed analog-to-digital converter, and the sampling rate of the high-speed analog-to-digital converter is greater than or equal to 2 times that of the duplexer A0 receiving band bandwidth;
  • the digital processing unit E is connected to the canceler circuit B through a multi-channel digital-to-analog converter, and transfers the controlled amounts of amplitude and phase to the canceler circuit B.
  • the amplitude adjustment accuracy and phase adjustment accuracy requirements of the canceler circuit B Mainly comes from the need for passive intermodulation signal cancellation capabilities.
  • the amplitude adjustment accuracy of the canceler circuit B in this embodiment is less than 0.1 dB and the phase adjustment accuracy is less than 1 degree.
  • the bus includes but is not limited to I2C bus and SPI bus;
  • the digital processing unit E obtains the transmitted signal frequency information and the received signal frequency information by using the transmitted signal frequency discriminating circuit E1, the radio frequency port of the transmitting signal frequency discriminating circuit E1 and the transmitting circuit unit F transmit Connected somewhere on the link, the transmission signal frequency discrimination circuit E1 is connected to the digital processing unit E through a high-speed analog-to-digital converter; at the same time, there is an interface between the digital processing unit E and the transmission signal frequency discrimination circuit E1. Configure the parameters of the transmitted signal frequency discrimination circuit E1 through the bus, such as local oscillator frequency, link gain, etc.
  • the bus includes but is not limited to I2C bus and SPI bus;
  • the digital processing unit E is equipped with at least one information interaction interface, and its functions include but are not limited to program download, configuration information input, remote alarm and maintenance;
  • the configuration information to be input includes the transmission signal bandwidth and frequency band of the device and the reception signal bandwidth and Frequency band, the order and frequency band information of the main interference components in the passive intermodulation signal, the preset value of the passive intermodulation signal and the time-varying curve, the maximum number of cancellations;
  • the digital processing unit E can be obtained through the information interaction interface Frequency information of the transmitted signal and frequency information of the received signal;
  • the information interaction interface can also perform data interaction with Internet background resources: upload the passive intermodulation value during the operation of the device, and the experience of the passive intermodulation value changing with time Curve, and the status information of each module circuit in the passive intermodulation signal adaptive cancellation device; or download the integrated optimized passive intermodulation signal preset value and the curve that changes with time.
  • the hardware configuration of the information interaction interface of the digital processing unit E includes but is not limited to an Ethernet interface, an
  • the first solution of the canceler circuit B is shown in FIG. 2:
  • One end of the amplitude modulation phase modulator B1 in the canceler circuit B is directly connected to the coupling port of the coupler A, or through a radio frequency switch B3 is connected to the coupling port of coupler A, and the other end is connected to an intermodulation signal generator B2;
  • the amplitude modulation phase modulator B1 includes an amplitude modulation circuit and a phase modulation circuit;
  • the first role is to make the intermodulation signal generator B2 withstand a suitable power radio frequency
  • the second role of the signal is to perform amplitude modulation and phase modulation on the intermodulation signal generated by the intermodulation signal generator B2, so as to cancel the passive intermodulation signal generated by the duplexer A0 and its antenna link in this device.
  • the amplitude modulation circuit 1 is composed of an adjustable attenuator and a fixed attenuator; the phase modulation circuit 2 includes at least two adjustable phase shifters; the amplitude adjustment range of the amplitude modulation phase modulator B1 is greater than 30dB, and the phase adjustment range is greater than 180
  • the load power of the amplitude modulator P1 in the canceler circuit B is greater than or equal to the load power threshold of the canceler circuit B, that is, the average power gate carried by the amplitude modulator P1 in the canceler circuit B
  • the limit is greater than or equal to 20 dBm and the peak power threshold of the load is greater than or equal to 30 dBm.
  • the working frequency band of the AM phase modulator B1 includes the transmitting frequency band and the receiving frequency band of the duplexer A0.
  • the gain fluctuation within the frequency band of the AM phase modulator B1 is related to the transmitting frequency band and the receiving frequency band and needs to be within a certain threshold range Inside.
  • the transmission signal input into the radio frequency signal of the canceler circuit B is input to the amplitude modulation phase modulator B1 through the radio frequency switch B3 or directly, and then is input to the mutual after being adjusted by the power of the amplitude modulation circuit 1 in the amplitude modulation phase modulator B1 Modulation signal generator B2, so that the intermodulation signal generator B2 generates an intermodulation signal with the same frequency, different amplitude and different phase as the passive intermodulation signal in the radio frequency signal, and the intermodulation signal falls into the receiving frequency band Single third-order component, or single fifth-order component, or single higher-order component, or multiple third-order components at different frequencies, or multiple fifth-order components at different frequencies, or multiple different frequencies High-order components, or the amplitude relationship and phase relationship between the third-order component, the fifth-order component, and even higher-order components, and the passive intermodulation signal generated by the duplexer A0 and its antenna link A single 3rd order component, or a single 5th order component, or a single higher order
  • the intermodulation cancellation signal and the passive The components in the intermodulation signal are cancelled.
  • the canceled passive intermodulation signal is less than or equal to the preset value of passive intermodulation; at the same time, the transmitted and received signals in duplexer A0 and its antenna link are in duplexer A0 and Normal operation in its antenna link;
  • the second solution of the canceler circuit B is shown in FIG. 3: one end of the amplitude modulation circuit 3 in the canceler circuit B is connected to the coupling port of the coupler A through the first circulator 4 or It can be connected to the coupling port of the coupler A through the first circulator 4 and the RF switch B3; the other end is connected to the intermodulation signal generator B2 through the second circulator 5; the amplitude modulation phase modulator B1 in the canceler circuit B One end is connected to the intermodulation signal generator B2 through the second circulator 5; the other end is connected to the coupling port of the coupler A through the first circulator 4 or may be connected to the coupler A through the first circulator 4 and the RF switch B3 Coupling port connection; the amplitude modulation circuit 3, the role is to make the intermodulation signal generator B2 withstand a suitable power RF signal; the amplitude modulation phase modulator B1 contains the amplitude modulation circuit 1 and the phase modulation circuit 2, the role is to intermodul
  • the working frequency band of the amplitude modulation phase modulator B1 includes the In the receiving frequency band of the duplexer A0, the gain fluctuation in the frequency band of the AM phase modulator B1 is related to the receiving frequency band and needs to be within a certain threshold; the load carrying power of the AM circuit 3 in the canceler circuit B is greater than or equal to the The carrying power threshold value of the canceller circuit B, that is, the average power threshold value carried by the amplitude modulation circuit 3 in the canceler circuit B is greater than or equal to 20 dBm and the peak power threshold value carried is greater than or equal to 30 dBm;
  • the transmission signal input into the radio frequency signal of the canceller circuit B is input to the amplitude modulation circuit 3 through the first circulator 4 or input to the amplitude modulation circuit 3 through the radio frequency switch B3 and the first circulator 4, and then passes through the amplitude modulation circuit 3 After the power is adjusted, it is input to the intermodulation signal generator B2 through the second circulator 5, so that the intermodulation signal generator B2 generates a mutual frequency with the same frequency, different amplitude and different phase as the passive intermodulation signal in the radio frequency signal.
  • Modulation signal and a single third-order component, or a single fifth-order component, or a single higher-order component in the intermodulation signal that falls into the receiving frequency band, or a third-order component at multiple different frequency points, or multiple different frequency points 5th order component, or higher order components of multiple different frequency points, or both the amplitude relationship and the phase relationship between the 3rd order component, 5th order component and even higher order component and the duplexer A0 and
  • the passive intermodulation signal generated by the antenna link falls into a single third-order component, or a single fifth-order component, or a single higher-order component, or multiple third-order components at different frequencies, or multiple The amplitude relationship and phase relationship between the 5th order component at different frequency points, or multiple higher order components at different frequency points, or the 3rd order component, 5th order component and even higher order components at the same time; and The amplitude of the intermodulation signal generated by the power of the received signal and the passive intermodulation signal in the radio frequency signal on the intermodulation signal generator
  • the cancellation result has an impact; after being reflected, the intermodulation signal is input to the AM phase modulator B1 through the second circulator 5, and after the amplitude adjustment and phase adjustment of the AM phase modulator B1, through the first circulator 4 or through the first
  • the circulator 4 and the RF switch B3 are finally coupled out to the main path of the coupler A, forming a component frequency that falls into the receiving frequency band and has a certain frequency interval from the received signal in the passive intermodulation signal with the main path of the coupler A
  • the intermodulation cancellation signal cancels with the components in the passive intermodulation signal, the passive intermodulation signal after cancellation is less than or equal to the passive intermodulation preset value;
  • the transmitted and received signals in the duplexer A0 and its antenna link operate normally in the duplexer A0 and its antenna link;
  • the intermodulation signal generator B2 in the two solutions of the canceler circuit B includes but is not limited to a single diode, a single triode, or a parallel configuration of multiple diodes; the specific model of the diode or the specific model of the triode and the intermodulation are generated
  • the amplitude characteristic of the 3rd, 5th or higher order intermodulation signal of the signal is related to the phase characteristic; when multiple diodes of the same type are connected in parallel, the strength of the intermodulation signal will be enhanced; the power of the intermodulation signal generator B2 is greater than or equal to
  • the canceller circuit B carries the difference between the power threshold value and the link loss from the radio frequency input port of the canceller circuit B to the intermodulation signal generator B2.
  • the bearing power of the intermodulation signal generator B2 is greater than or equal to 20 dBm.
  • the passive intermodulation detection circuit D includes at least a low-noise amplifier, a down-conversion module, and a high-speed analog-to-digital converter; the noise factor of the low-noise amplifier is less than 1 dB; the down-conversion module can convert the received radio frequency signal into an intermediate frequency signal, Or convert the received RF signal to a zero-IF signal; the sampling dynamic range of the high-speed analog-to-digital converter must be greater than the difference between the maximum power value of the received signal and the power value corresponding to the preset value of passive intermodulation, and the sampling rate is greater than It is equal to twice the bandwidth of the duplexer A0 receiving band.
  • the minimum power that the passive intermodulation detection circuit D can sample is less than or equal to the passive intermodulation power value corresponding to the preset value. That is, the sampling dynamic range of the high-speed analog-to-digital converter in this embodiment needs to be greater than 70dB, the number of digits of the analog-to-digital converter is 14 bits, and the sampling rate is greater than or equal to 2 times the bandwidth of the duplexer A0 receiving band; the passive intermodulation The minimum power that the detection circuit D can sample is less than or equal to the passive intermodulation power value corresponding to the preset value, which is -115 dBm in this embodiment.
  • the circuit can adjust the link gain according to the amplitude of the total power of the received RF signal to avoid link blocking caused by the received signal or other signals; the gain of the passive intermodulation detection circuit D is determined by the required passive intermodulation The preset value, the minimum sampling power of the high-speed analog-to-digital converter in the passive intermodulation detection circuit D, the link noise figure, etc. are determined; the maximum value of the received signal power of the passive intermodulation detection circuit D is greater than or equal to the actual value of the device The maximum received signal power specified by the corresponding communication standard is -50 dBm in this embodiment.
  • the passive intermodulation detection circuit D may adopt a receiving superheterodyne structure as shown in FIG. 4 to convert the radio frequency signal into an intermediate frequency signal and then perform analog-to-digital conversion.
  • the passive intermodulation detection circuit D is composed of a low noise amplifier D1 , RF filtering and small signal amplification unit D2, mixer D3, local oscillator D4, intermediate frequency filter D5, intermediate frequency amplifier D6, analog-to-digital converter D7, in which the filtering components in the RF filtering and small signal amplification unit D2
  • the band frequency band is the receiving frequency band of the duplexer A0; the passive intermodulation detection circuit D may adopt a receiving zero-IF structure as shown in FIG.
  • the source intermodulation detection circuit D is composed of a low-noise amplifier D1, a radio frequency filtering and small-signal amplification unit D2, a down-conversion and analog-to-digital conversion unit D8, wherein the passband frequency band of the filtering component in the radio frequency filtering and small-signal amplification unit D2 is double
  • the receiving frequency band of the tool A0, the function of the down-conversion and analog-to-digital conversion unit D8 is to directly convert the radio frequency signal to a zero-IF signal and perform analog-to-digital conversion.
  • the digital processing unit E is connected to the canceler circuit B through a multi-channel digital-to-analog converter, and transfers the controlled amounts of amplitude and phase to the canceler circuit B.
  • the amplitude adjustment accuracy and phase adjustment accuracy requirements of the canceler circuit B Mainly from passive intermodulation signal cancellation capability requirements; the number of digits of the digital-to-analog converter in the digital processing unit E is between 10 and 18 bits, and there are at least three digital-to-analog converters.
  • the digital processing unit E includes at least a logic processing and arithmetic processing device with digital signal processing function, which is used for digital signal reception, algorithm processing, digital signal output, control and configuration signal output, etc.
  • the logic processing and arithmetic processing devices include but are not limited to field programmable gate array devices, central processors, and digital signal processors;
  • the hardware configuration of the information interaction interface of the digital processing unit E includes but is not limited to Ethernet interface, RS- 485 bus interface;
  • the number of digits of the digital-to-analog converter in the digital processing unit E is between 12 bits, and there are at least 3 digital-to-analog converters;
  • the operation in the digital processing unit E corresponds to "an adaptive offset
  • FIG. 6 The procedure of "passive intermodulation signal in wireless transceiver system", the flow chart of this method is shown in FIG. 6.
  • Table 1 There are two 43 dBm single-tone signals in the transmitting circuit unit F to form a 46 dBm double-tone signal, which causes the duplexer A0 and its antenna link to generate The passive intermodulation signal is detected, and the amplitude of the third-order component in the passive intermodulation actually tested at the receiving port of the duplexer A0 is -94.7dBm, and the fifth-order component is -124.8dBm.
  • the seventh-order component is hot in the spectrum analyzer.
  • the component of the passive intermodulation signal of the duplexer A0 and its antenna link that falls into the receiving frequency band is less than or equal to the preset value of -112dBm, so it is mainly optimized for poor third-order passive intermodulation, while 3
  • the amplitude difference between the first-order signal and the fifth-order signal is 30.1dB
  • the test value of the intermodulation signal generated by the specific diode selected at the receiving port of the duplexer A0 at this time is: the amplitude of the third-order component is -75.6dBm, and the fifth-order component -106.3dBm, the 7th-order component is under the thermal noise of the spectrum analyzer, the amplitude difference between the 3rd-order signal and the 5th-order signal is 30.7dB; when the passive intermodulation cancellation function is turned on, at the receiving port of the duplexer A0
  • the measured third-order component of passive intermodulation is shown in Figure 7, with an amplitude of -119.6dBm, and the
  • the duplexer A0 of the device is the duplexer A0 of the wireless transceiver device;
  • the passive intermodulation detection circuit D of the device is complex Use the components or units of the receiving link of the wireless transceiver device, and adjust accordingly according to the receiving frequency band of the wireless receiving and transmitting device;
  • the transmitting circuit unit F of the device multiplexes the components or units of the transmitting link of the wireless receiving and sending device, and according to the wireless transceiver
  • the transmission frequency band of the device is adjusted accordingly;
  • the digital processing unit E of the device multiplexes the components or units of the digital processing unit of the wireless transceiver device;
  • the main channel port of the coupler A of the device and the antenna of the duplexer A0 of the wireless transceiver device The port is directly connected;
  • the radio frequency port of the canceler circuit B of the device is directly connected to the coupling port of the coupler A, and the amplitude and
  • the value mainly optimize the third-order passive intermodulation component; when the passive intermodulation cancellation function is turned on, the third-order component in the passive intermodulation tested at the receiving port of the duplexer A0 at this time is shown in Figure 10.
  • the ACPR adjacent channel power is 49.7dBc/60.4dBc as shown in Figure 11, and the ACPR corresponding to the transmitted signal 2 is 47.9
  • the RSSI report value of the received link is detected to indicate the strength of the received signal. -60.59dBfs; after the passive intermodulation cancellation function of the device is turned on, the ACPR corresponding to the transmitted signal 1 is 50.2dBc/60.5dBc as shown in FIG. 13, and the ACPR corresponding to the transmitted signal 2 is 48.5dBc/ as shown in FIG. 14. 60.3dBc, detect and receive The RSSI report value of the link is -60.69dBfs; in addition, the frequency of the received signal 1 corresponding to the transmitted signal 1 is 1725Mhz, the IBW is 20MHz, the frequency of the received signal 2 corresponding to the transmitted signal 2 is 1765Mhz, and the IBW is 20MHz.
  • the received signal loops back to the transmit link and tests the EVM.
  • the EVM of the received signal 1 is about 3.1% as shown in FIG. 15 and the EVM of the received signal 2 is shown as FIG. 16 About 3.06%; after the passive intermodulation cancellation function of the device is turned on, the EVM of the received signal 1 is about 3.1% as shown in FIG. 17 and the EVM of the received signal 2 is about 3.06% as shown in FIG.
  • the wireless repeater station includes a coupler A-1, a coupler A-2, and a canceller circuit B-1 to cancel Circuit B-2, receiving circuit unit D-1, receiving circuit unit D-2, digital processing unit E, duplexer A0-1, duplexer A0-2, transmitting circuit unit F-1, transmitting circuit unit F -2; take duplexer A0-1 and duplexer A0-2 as passive intermodulation index optimization objects and form two sets of devices with passive intermodulation cancellation function around the duplexer, with duplexer A0- 1 is a device with passive intermodulation cancellation function composed of passive intermodulation index optimization objects, referred to as the first device, and a passive intermodulation cancellation function composed of duplexer A0-2 as passive intermodulation index optimization objects
  • the device is called the second device for short; for the first device: the duplexer A0 of the device is the duplexer A0-1 of the wireless repeater; the passive intermodulation detection circuit D
  • the amplitude adjustment and phase adjustment of the canceler circuit B-1 are realized by the amplitude and phase control parameters calculated by the digital processing unit E;
  • the antenna feed component A2 and antenna A1 of the device are the corresponding components A2-1 and antenna A1-1 on the antenna link of the wireless repeater;
  • the description of the second device is: the duplexer A0 of the device is The duplexer A0-2 of the wireless repeater station; the passive intermodulation detection circuit D of the device multiplexes the components or units of the receiving link of the wireless repeater station to form the passive intermodulation detection circuit D-2; the device The transmission circuit unit F of the multiplexed transmission circuit unit F-2 of the wireless repeater station; the digital processing unit E of the device multiplexes the digital processing unit E of the wireless repeater station, the digital processing unit E corresponds to a
  • the program adapted to the method of canceling passive intermodulation signals in the wireless transceiver system will be integrated into the overall program of the wireless repeater; the coupler A of this device needs to be added
  • the coupling port of coupler A-2 is relative to the duplexer A0-2. 'S launch The signal is a forward coupling port; the canceler circuit B of this device needs to be newly added to the wireless repeater and constitute a canceler circuit B-2, and its RF port is directly connected to the coupling port of the coupler A-2 to cancel
  • the amplitude adjustment and phase adjustment of the amplifier circuit B-2 are realized by the amplitude and phase control parameters calculated by the digital processing unit E; the antenna feed component A2 and the antenna A1 of the device are on the antenna link of the wireless repeater Corresponding component A2-2 and antenna A1-2; the connection between the first device and the second device in the wireless repeater at this time is the same as the passive intermodulation cancellation device described in the present invention, the first device and the second device The devices are integrated into one by the digital processing unit E.
  • S1 Obtain the transmitted signal bandwidth and frequency band, the received signal bandwidth and frequency band, the order and frequency band information of the main interference components in the passive intermodulation signal, the expected passive intermodulation preset value and the time-varying through the digital processing unit The initial empirical data of the curve, amplitude and phase, the maximum number of cancellations and other information, and converted into the corresponding configuration parameters;
  • step S2 According to the configuration parameters of the transmitted signal in step S1, the digital processing unit obtains the frequency point of the passive intermodulation signal and converts it into the corresponding digital filtering parameter and stores it in the parameter configuration table;
  • the digital processing unit samples the passive intermodulation detection circuit according to the configuration parameters of the received signal, the configuration parameters of the passive intermodulation signal in step S1, and the digital filtering parameters of the passive intermodulation signal obtained in step S2
  • the signal is digitally filtered to filter out other signal components except the passive intermodulation signal, and the amplitude value of the passive intermodulation signal that falls into the receiving frequency band is obtained;
  • the algorithm for determining the amplitude value includes but is not limited to segmented integration Method, direct integration method based on signal bandwidth;
  • step S4 determine the current working state; the default value of the state identification of the working state is: "initial working mode”; if the state identification value of the working state is "initial working mode", continue to step S5-1, otherwise continue to step S5-2 ;
  • step S5-1 Compare the passive intermodulation signal amplitude value obtained in step S3 with the passive intermodulation preset value in step S1 to determine whether the passive intermodulation signal amplitude is less than or equal to the passive intermodulation preset value;
  • step S6 If the judgment result of step S5-1 is "Yes", the canceller circuit continues to maintain the high isolation state of the link between the intermodulation signal generator and the coupler; and returns to step S2;
  • step S7 If the judgment result of step S5-1 is "No", the canceller circuit is switched to the low isolation state of the link between the intermodulation signal generator and the coupler; and the state identification value of the working state is set to " Offset working status"; continue to step S8;
  • step S5-2 Compare the amplitude value of the passive intermodulation signal obtained in step S3 with the preset value of the passive intermodulation signal in step S1 to determine whether the amplitude of the passive intermodulation signal is less than or equal to the preset value of passive intermodulation; If the judgment result of step S5-2 is "Yes”, then maintain the state and return to step S2; if the judgment result of step S5-2 is "No", then execute step S8;
  • step S8 Calculate the amplitude and phase adjustment values of the canceller circuit according to the amplitude value of the passive intermodulation signal in step S3; and distribute to the amplitude modulator and phase modulator in the canceller circuit to implement cancellation; after completing the current round of cancellation processing After that, it will continue to return to step S2 to continue the next round of cancellation processing; the algorithm for determining the amplitude and phase adjustment values includes but is not limited to a two-dimensional minimum variance algorithm.
  • each antenna port of the duplexer in each transceiver link is immediately adjacent to a coupler A, and Canceller circuit B;
  • FIG. 20 of the specification A schematic diagram of one example of the use of a multi-radio link is shown in FIG. 20 of the specification: the entire link includes multiple wireless transceiver devices, and the multiple radio frequency system combiner , Antenna A1 and antenna feed component A2, etc.; and each branch has a passive intermodulation cancellation device connected to a single transceiver link of the wireless transceiver equipment, and the duplexer A0, antenna A1, antenna feed on each branch link.
  • the passive intermodulation generated by component A2 and the like and the passive intermodulation generated by the combiner H of the multi-radio frequency system falling into the receiving frequency band can be cancelled within a certain range;
  • the apparatus in this embodiment is applied to a wireless transceiver device, and the wireless transceiver device has multiple transceiver links
  • a schematic diagram of one of the use examples is shown in FIG. 21 of the specification: the entire link includes the wireless transceiver device , Multiple antennas A1-1, A1-2, ..., and multiple antenna feed components A2-1, A2-2, ...; wireless transceiver equipment, each transceiver link has a passive intermodulation cancellation device connected The components of passive intermodulation generated by duplexers, antenna feed components, antennas, etc. on each branch link falling into the receiving frequency band can be cancelled within a certain range;
  • the device designed by applying the invention when the component of the link passive intermodulation signal falling into the receiving frequency band is -90dBm/Hz to -95dBm/Hz, the device can make the passive intermodulation signal The cancellation result is greater than 20dB.
  • the component of the link passive intermodulation signal falling into the receiving frequency band is better than -95dBm/Hz, the device can make the passive intermodulation signal cancellation result better than -115dBm/Hz.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Transceivers (AREA)

Abstract

L'invention concerne un appareil d'annulation adaptative de signaux d'intermodulation passifs. Un port de canal principal d'un coupleur est connecté à un port d'antenne d'un duplexeur, l'autre port de canal principal est connecté à un ensemble d'alimentation d'antenne sur une liaison d'antenne, et un port de couplage du coupleur est électriquement connecté à un port radiofréquence d'un circuit d'annulation ; l'extrémité d'entrée d'un circuit de détection d'intermodulation passive est connectée électriquement à un port de réception du duplexeur, et l'extrémité de sortie du circuit de détection d'intermodulation passive est connectée électriquement à l'extrémité d'entrée d'une unité de traitement numérique ; l'unité de traitement numérique est connectée électriquement à une unité de circuit de transmission au moyen d'un circuit de discrimination de fréquence de signal de transmission, et l'extrémité de sortie de l'unité de traitement numérique est connectée de manière électrique et séparée aux extrémités d'entrée du circuit de détection d'intermodulation passive, l'unité de circuit de transmission et le circuit d'annulation ; l'extrémité de sortie de l'unité de circuit de transmission est électriquement connectée à l'extrémité d'entrée du duplexeur. Selon la présente invention, la composante des signaux d'intermodulation passifs, générée par un dispositif d'émission-réception sans fil et d'autres dispositifs ou ensembles sur la liaison, du port d'antenne du dispositif à l'antenne, appartenant à une bande de fréquence de réception peut être annulée.
PCT/CN2019/090978 2018-09-29 2019-06-12 Appareil et procédé d'annulation adaptative de signaux d'intermodulation passifs WO2020113928A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN201811149022 2018-09-29
CN201821601322 2018-09-29
CN201811468365.1 2018-12-03
CN201822014269.1 2018-12-03
CN201822014269.1U CN209283217U (zh) 2018-09-29 2018-12-03 自适应抵消无源互调信号的装置
CN201811468365.1A CN109995385B (zh) 2018-09-29 2018-12-03 自适应抵消无源互调信号的装置及其方法

Publications (1)

Publication Number Publication Date
WO2020113928A1 true WO2020113928A1 (fr) 2020-06-11

Family

ID=70975648

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/090978 WO2020113928A1 (fr) 2018-09-29 2019-06-12 Appareil et procédé d'annulation adaptative de signaux d'intermodulation passifs

Country Status (1)

Country Link
WO (1) WO2020113928A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2599211A (en) * 2020-08-03 2022-03-30 Nokia Solutions & Networks Oy PIM Cancellation
US20230179252A1 (en) * 2020-03-18 2023-06-08 Telefonaktiebolaget Lm Ericsson (Publ) Removal of passive intermodulation in antenna systems

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103199808A (zh) * 2013-02-07 2013-07-10 武汉凡谷电子技术股份有限公司 一种用于无源器件的互调抵消装置
US20150244414A1 (en) * 2014-02-27 2015-08-27 Scintera Networks Llc In-service monitoring and cancellation of passive intermodulation interferences
CN107231165A (zh) * 2016-03-24 2017-10-03 Ace技术株式会社 用于去除无源互调失真的端接装置
CN108777585A (zh) * 2018-02-09 2018-11-09 香港梵行科技有限公司 一种自适应抵消无线收发***中无源互调信号的装置及方法
CN109495127A (zh) * 2018-09-27 2019-03-19 香港梵行科技有限公司 自适应抵消无源互调信号的装置、方法及应用设备

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103199808A (zh) * 2013-02-07 2013-07-10 武汉凡谷电子技术股份有限公司 一种用于无源器件的互调抵消装置
US20150244414A1 (en) * 2014-02-27 2015-08-27 Scintera Networks Llc In-service monitoring and cancellation of passive intermodulation interferences
CN107231165A (zh) * 2016-03-24 2017-10-03 Ace技术株式会社 用于去除无源互调失真的端接装置
CN108777585A (zh) * 2018-02-09 2018-11-09 香港梵行科技有限公司 一种自适应抵消无线收发***中无源互调信号的装置及方法
CN109495127A (zh) * 2018-09-27 2019-03-19 香港梵行科技有限公司 自适应抵消无源互调信号的装置、方法及应用设备

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230179252A1 (en) * 2020-03-18 2023-06-08 Telefonaktiebolaget Lm Ericsson (Publ) Removal of passive intermodulation in antenna systems
US11996879B2 (en) * 2020-03-18 2024-05-28 Telefonaktiebolaget Lm Ericsson (Publ) Removal of passive intermodulation in antenna systems
GB2599211A (en) * 2020-08-03 2022-03-30 Nokia Solutions & Networks Oy PIM Cancellation
GB2599211B (en) * 2020-08-03 2022-11-23 Nokia Solutions & Networks Oy PIM Cancellation
US11575400B2 (en) 2020-08-03 2023-02-07 Nokia Solutions And Networks Oy PIM cancellation

Similar Documents

Publication Publication Date Title
WO2020103434A1 (fr) Dispositif et procédé d'annulation auto-adaptative de signal d'intermodulation passive, et appareil d'application
WO2020113927A1 (fr) Appareil et procédé d'annulation auto-adaptative d'un signal d'intermodulation passive
CN109495124B (zh) 一种自适应抵消无源互调信号的方法、装置及应用设备
US8615207B2 (en) Power amplifier linearization feedback methods and systems
JP6197104B2 (ja) 無線通信システムの信号相殺方法および装置
CN102299878B (zh) 一种多频段dpd的实现方法及装置
US10069576B2 (en) Interference suppression system and method
CN103477576B (zh) 产生干扰信号的方法以及执行这样方法的设备
CN107017917B (zh) 一种td-lte三频自动识别的功放方法和装置
US7502599B2 (en) Cartesian loop transmitter and method of adjusting an output level of such transmitter
WO2019127859A1 (fr) Unité distante de système d'antenne distribué prenant en charge une bande de fréquences complète et procédé de mise en œuvre de celle-ci
WO2020113928A1 (fr) Appareil et procédé d'annulation adaptative de signaux d'intermodulation passifs
KR101868965B1 (ko) 분산 안테나 시스템의 리모트 장치
WO2020103433A1 (fr) Procédé et appareil d'annulation adaptative de signal d'intermodulation passif, et dispositif d'application
CN109995385B (zh) 自适应抵消无源互调信号的装置及其方法
CN106713195B (zh) 微波数字预失真处理反馈电路、闭环电路及收、发信机
WO2021047504A1 (fr) Répéteur à fibre optique et procédé de détection de signal d'intermodulation passive, et système associé
CN107294600B (zh) 一种dpd环路检测方法及设备
US11223377B2 (en) Front-end circuit
CN210041824U (zh) 一种自适应抵消无源互调信号的装置
CN104363027A (zh) 一种微波跳频收发信机
CN209283217U (zh) 自适应抵消无源互调信号的装置
CN108900207B (zh) 功放装置、射频信号处理***和基站
CN209088944U (zh) 自适应抵消无源互调信号的装置
CN107547145B (zh) 一种本振泄漏信号的检测方法及装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19892217

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19892217

Country of ref document: EP

Kind code of ref document: A1

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 16/02/2022)

122 Ep: pct application non-entry in european phase

Ref document number: 19892217

Country of ref document: EP

Kind code of ref document: A1