CN108777585B - Device and method for self-adaptively counteracting passive intermodulation signal in wireless transceiving system - Google Patents

Device and method for self-adaptively counteracting passive intermodulation signal in wireless transceiving system Download PDF

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CN108777585B
CN108777585B CN201810134215.0A CN201810134215A CN108777585B CN 108777585 B CN108777585 B CN 108777585B CN 201810134215 A CN201810134215 A CN 201810134215A CN 108777585 B CN108777585 B CN 108777585B
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signal
passive intermodulation
frequency
cancellation
intermodulation
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CN108777585A (en
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孟庆南
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Hongkong Vanlin Technology Co ltd
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Priority to PCT/CN2018/125172 priority patent/WO2019153959A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
    • 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
    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
    • 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

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

The invention relates to a device and a method for self-adaptively counteracting a passive intermodulation signal in a wireless transceiving system, which counteracts a component falling into a receiving frequency band in the passive intermodulation signal generated by the wireless transceiving system, and comprises a plurality of groups of couplers, a counteractor circuit, a transmitting signal frequency discrimination circuit, a counteraction detection circuit and a digital processing control unit; the device is connected between wireless transceiver and antenna in series, and is coupled and divided into three signals by a plurality of groups of couplers: the first path of signal generates a signal for counteracting the passive intermodulation through a canceller circuit, and counteracts the passive intermodulation through signal superposition; the second path of signal is processed by a transmitting signal frequency discrimination circuit and a digital processing control unit to calculate the frequency of the passive intermodulation signal; the third path of signal is detected for the offset result of the passive intermodulation signal through the offset detection circuit and the digital processing control unit, and the amplitude and the phase of the canceller circuit are regulated and controlled in real time, so that the offset result of the passive intermodulation signal meets a preset value; the invention can be installed outside the wireless transceiver or inside the wireless transceiver.

Description

Device and method for self-adaptively counteracting passive intermodulation signal in wireless transceiving system
Technical Field
The present invention relates to the field of wireless communications. In particular, the invention relates to a numerical control cancellation device for passive intermodulation signals of a wireless transceiving system.
Background
In communication antenna feeder systems, wireless transceiving equipment is widely applied. The wireless transceiver itself includes devices for generating passive intermodulation signals, such as radio frequency passive devices, filters, combiners, etc.; the link from the antenna port of the transceiver to the antenna also contains many devices that generate passive intermodulation signals, such as couplers, rf cables, tower amplifiers, etc. For a wireless transceiving system, how to suppress intermodulation interference generated to a receiver of a wireless transceiving device caused by a transmitting signal in the wireless transceiving system is a key problem of the system. Therefore, when the wireless transceiver device is in operation, the level of the passive intermodulation signal generated by the transmitting channel is required to be as low as possible 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 modes:
the reference CN100490307C discloses a name: the invention relates to a signal processing circuit, a base station and a method for eliminating intermodulation products, which divides an original carrier wave input into a nonlinear unit into two paths, respectively inputs the two paths of the original carrier waves into two branches, the first path of the original carrier wave generates a processing signal containing a first group of intermodulation products through the nonlinear unit, and the second path of the original carrier wave passes through a branching unit, a frequency multiplier, a mixer and a regulating circuit. And generating a control signal containing a second group of high-order intermodulation products, and finally superposing the two paths of signals. The second group of high-order intermodulation products have the same frequency, nearly the same amplitude and opposite phase with the first group of intermodulation products, and the intermodulation signals are counteracted.
The technical scheme has the following defects: 1. the technical scheme is not applicable to passive devices, the intermodulation value difference of different positions in the nonlinear unit is not considered, the difference is obvious for the passive devices, and the amplitude attenuation and the phase change degree of transmission signals are very large in the passive circuit. Under the condition that intermodulation is generated at a plurality of positions, an intermodulation signal generated at the front end of the circuit is greatly attenuated in the signal transmission process, and the intermodulation signal output by the circuit only contains the intermodulation signal generated at the tail end of the circuit, so that for a passive device, if a signal is taken from the front end of the nonlinear unit, the generated intermodulation cancellation signal cannot be cancelled with the intermodulation signal of an antenna port; 2. the intermodulation cancellation signals generated by the technical scheme, namely the second group of high-order intermodulation products, are limited to fixed-order intermodulation products, and only the intermodulation signals of the nonlinear units in the corresponding frequency band can be eliminated, so that the method has limitation.
Reference 201310048951.1 discloses a name: the invention relates to an intermodulation cancellation device for a passive device, which is characterized in that a transmitting signal containing a high-order intermodulation product is directly coupled from an output end of the passive device, is adjusted by a passive regulator and transmitted to the tail end of a radio frequency link with an intermodulation signal generator to be reflected, then a cancellation signal with the same frequency, level and opposite phase of the intermodulation signal of the transmitting signal of the passive device is obtained through adjustment of the passive regulator again, and the cancellation signal is superposed with a transmitting signal of an output end of a passive nonlinear unit through a coupler to realize intermodulation cancellation.
The technical scheme has the following defects: 1. according to the technical scheme, the passive regulator is adopted, amplitude regulation and phase regulation are passive devices, and if the passive regulator needs to be driven by means of external force, such as motor driving or direct manual driving, the modes can cause high practical application cost and are inconvenient to commercialize; 2. because there is no feedback detection circuit for the passive intermodulation cancellation result, the cancellation result cannot be monitored and adjusted in real time.
In addition, other methods for reducing the level of the passive intermodulation signal mainly focus on the structure and the process, which often require additional cost, and the electroplating process of thickening the metal coating often increases the pollution.
Disclosure of Invention
It is an object of the present invention to overcome the above-mentioned shortcomings in the prior art, and to provide a digitally adaptive intermodulation cancellation apparatus for passive devices in a wireless transceiver system. So that the passive intermodulation signals generated in the wireless transceiver and generated by other devices or components on the link from the antenna port of the wireless transceiver to the antenna can be counteracted by the components falling into the receiving frequency band.
In order to achieve the purpose, the invention adopts the following technical scheme: the invention discloses a device for self-adaptively counteracting a passive intermodulation signal in a wireless transceiving system, which comprises a plurality of groups of couplers, a counteractor circuit, a transmitting signal frequency discrimination circuit, a passive intermodulation counteracting detection circuit and a digital processing control unit; one port of the multiple groups of couplers is connected with an antenna port of the wireless transceiver, and the other port of the multiple groups of couplers is connected with an antenna; the multi-group coupler couples out radio frequency signals from an antenna port of the wireless transceiving equipment to a link of the antenna, and the radio frequency signals are divided into three paths and output to the canceller circuit, the transmitting signal frequency discrimination circuit and the passive intermodulation cancellation detection circuit respectively; the radio frequency signals comprise a transmit signal, a passive intermodulation signal, and a receive signal; the radio frequency signal output to the canceller circuit is processed by an amplitude modulation phase modulator and an intermodulation signal generator to generate a first intermodulation cancellation signal which has the same frequency, different amplitude and different phase with a passive intermodulation signal in the radio frequency signal; after the first intermodulation cancellation signal is reflected at the tail end of the canceller circuit, the first intermodulation cancellation signal is processed by an amplitude modulation phase modulator again and is coupled and output to a plurality of groups of couplers to form a second intermodulation cancellation signal which has the same frequency, the same amplitude and opposite phase with the passive intermodulation signal in the radio frequency signal, the second intermodulation cancellation signal is cancelled with the passive intermodulation signal in the radio frequency signal, and the cancelled passive intermodulation cancellation signal is less than or equal to a passive intermodulation preset value; the adjustment of the amplitude modulation phase modulator is realized by the amplitude and phase control parameters output by the operation of the digital processing control unit; the passive intermodulation generated by the passive device in the wireless transceiver gradually changes along with time, and a preset value curve of the change of the passive intermodulation along with the time is set in the device; the transmitting signal frequency discrimination circuit is used for converting the coupled radio frequency signals into digital signals, inputting the digital signals into the digital processing control unit for analysis and calculation to obtain specific transmitting signal frequency points of a known transmitting signal working frequency band, further obtaining frequency point values of passive intermodulation falling into receiving frequency band components of the wireless transceiving equipment, and converting the frequency point values into digital filtering parameters for processing passive intermodulation sampling signals; the passive intermodulation cancellation detection circuit is used for converting a passive intermodulation signal of the coupled wireless transceiver into a digital signal when the passive intermodulation signal falls into a receiving frequency band component, inputting the digital signal into the digital processing control unit, and performing digital filtering processing and calculation to realize amplitude detection of the component of the passive intermodulation signal falling into the receiving frequency band; the digital processing control unit firstly obtains a passive intermodulation preset value through a man-machine interface, and then compares the detection amplitude of the passive intermodulation signal with the passive intermodulation preset value; when the detection amplitude is smaller than or equal to the preset value, the canceller circuit does not generate intermodulation cancellation signals and does not affect passive intermodulation indexes of the wireless transceiver equipment; when the detected amplitude is larger than the preset value, the canceller circuit generates an intermodulation cancellation signal which has the same frequency, the same amplitude and the opposite phase with the passive intermodulation signal of the wireless transceiver device through the adjustment of the amplitude and the phase, and the intermodulation cancellation signal is cancelled with the passive intermodulation signal in the radio frequency signal.
In a preferred embodiment of the present invention, the plurality of sets of couplers are constituted by a strip line cable, a cancellation coupler, a frequency discrimination coupler, a detection coupler and a feeding circuit; the first ports of the multiple groups of couplers are connected with the antenna ports of the passive devices in the wireless transceiving equipment by cables with the length ranging from 0 to 1 meter; the counteracting coupler couples out a radio frequency signal from a link behind an antenna port of the wireless transceiver and outputs the radio frequency signal to a counteracting device circuit, and the coupling degree range of the counteracting coupler is 25dB to 45 dB; the frequency discrimination coupler couples out a radio frequency signal from a link behind an antenna port of the wireless transceiver and outputs the radio frequency signal to a transmitting signal frequency discrimination circuit, and the coupling degree range of the frequency discrimination coupler is 30dB to 50 dB; the detection coupler couples out a radio frequency signal from a link behind an antenna port of the wireless transceiver and outputs the radio frequency signal to the passive intermodulation cancellation detection circuit, and the coupling degree range of the detection coupler is 25dB to 35 dB; the isolation range among the three coupling output ports is more than 70 dB; the passive intermodulation values generated by the multiple groups of couplers are smaller than a preset value; the characteristic curve of the passive intermodulation values generated by the multiple groups of couplers along with the change of time is obtained through experiments; the strip line cable in the multi-group coupler includes but is not limited to a coaxial cable, a micro-strip line, a strip line and a coaxial rod.
In a preferred embodiment of the invention, only the transmit signal of the radio frequency signals coupled by the cancellation coupler from the link after the antenna port of the radio transceiver device is capable of generating an intermodulation cancellation signal for passive intermodulation cancellation at the intermodulation signal generator, the effect not being generated at the intermodulation signal generator by the receive signal and the passive intermodulation signal of the radio frequency signals; the frequency of an intermodulation signal generated by a transmitting signal in the radio-frequency signal on an intermodulation signal generator is the same as the frequency of a passive intermodulation signal in the radio-frequency signal, but the amplitude value of the intermodulation signal is more than or equal to the sum of the passive intermodulation signal amplitude value in the radio-frequency signal and the coupling degree of a cancellation coupler; the characteristic curve of the intermodulation signal generated by the intermodulation signal generator along with the time change is obtained through experiments.
In a preferred embodiment of the invention, the canceller circuit is connected to the cancelling coupler directly or via a radio frequency switch.
In a preferred embodiment of the present invention, an amplitude modulation phase modulator in the canceller circuit has one end connected to the cancellation coupler and the other end connected to the intermodulation signal generator, and the amplitude modulation phase modulator includes an amplitude modulation circuit and a phase modulation circuit; or one end of an amplitude modulation phase modulator in the canceller circuit is connected with the cancellation coupler through a first circulator, the other end of the amplitude modulation phase modulator is connected with the intermodulation signal generator through a second circulator, and the amplitude modulation phase modulator only comprises an amplitude modulation circuit.
In a preferred embodiment of the present invention, the intermodulation signal generated by the intermodulation signal generator in the canceller circuit is reflected, passes through the am phase modulator, the cancellation coupler, and is coupled back to the stripline cable to form a passive intermodulation cancellation signal, which is cancelled with the passive intermodulation signal generated in the wireless transceiver; or the passive intermodulation signal coupled to the stripline cable and the wireless transceiver is counteracted through the second circulator, the amplitude modulation phase modulator, the first circulator and the cancellation coupler.
In a preferred embodiment of the present invention, the frequency discrimination circuit for the transmitted signal comprises an attenuator, a mixer circuit, an intermediate frequency filter, a digitally controllable gain amplifier and an analog-to-digital converter, which are connected in series in sequence; the passband bandwidth of the intermediate frequency filter is equal to the transmission bandwidth, and the mixer circuit is composed of a mixer and a local oscillator.
In a preferred embodiment of the present invention, the passive intermodulation cancellation detection circuit comprises a first rf filter, a low noise amplifier, a second rf filter, an rf amplifier circuit, a mixer, a local oscillator, an if filter, a digitally controllable gain amplifier, and an analog-to-digital converter; the pass band of both the first and second radio frequency filters is a receive signal band and the stop band is a transmit signal band; the passband bandwidth of the intermediate frequency filter is equal to the receiving bandwidth; the gain value range of a section of a link from the input port of the passive intermodulation cancellation detection circuit to the input port of the analog-to-digital converter in the passive intermodulation cancellation detection circuit is 80-120 dB; each stage of signal amplification circuit is isolated by a metal cavity.
In a preferred embodiment of the present invention, the digital processing control unit comprises a programmable logic device, a central processing unit and a digital signal processor; an interface is arranged between the digital processing control unit and the canceller circuit to transmit the control quantity of amplitude and phase to an amplitude modulation phase modulator in the canceller circuit; an interface is arranged between the digital processing control unit and the transmitting signal frequency discrimination circuit so as to obtain a sampling signal of the transmitting signal frequency discrimination circuit, perform digital filtering and frequency identification on the transmitting signal and finally calculate a frequency point of the passive intermodulation signal; an interface is arranged between the digital processing control unit and the passive intermodulation cancellation detection circuit so as to obtain a sampling signal of the passive intermodulation cancellation detection circuit, carry out digital filtering and amplitude calculation on the passive intermodulation signal, and control the amplitude and the phase of an amplitude modulation phase modulator in the canceller circuit according to the calculated amplitude value; the digital processing control unit human-computer interaction interface has the functions of, but not limited to, program downloading, configuration information input, remote alarm and maintenance; the configuration information to be input comprises a transmitting signal bandwidth and frequency band, a receiving signal bandwidth and frequency band, order and frequency band information of a main interference component in the passive intermodulation signal, a passive intermodulation signal preset value, a curve changing along with time and maximum offset times; the human-computer interaction interface can also perform data interaction with internet background resources: uploading a passive intermodulation value in the operation process of the equipment, an experience curve of the passive intermodulation value changing along with time, and state information of each module circuit in the passive intermodulation signal self-adaptive offset device; or downloading the passive intermodulation signal preset value after comprehensive optimization and the curve changing along with time.
The invention also discloses a wireless transceiving system comprising a device for adaptively offsetting the passive intermodulation signal, which comprises wireless transceiving equipment and an antenna feeder link arranged outside the wireless transceiving equipment, wherein the antenna feeder link is provided with the device for adaptively offsetting the passive intermodulation signal in the wireless transceiving system, each antenna port of the wireless transceiving equipment is connected with the device through a cable of 0-1 meter, and the passive intermodulation signal generated by a passive device corresponding to each antenna port of the wireless transceiving equipment and the component of the passive intermodulation signal generated by any equipment or component in the link behind the antenna port of the wireless transceiving equipment fall into a receiving frequency band are offset to reach the passive intermodulation preset index; the specific length of the cable in the range of 0 to 1 meter is determined by the best effect of passive intermodulation cancellation; the devices or components of each antenna feeder link include, but are not limited to, cables, connectors, tower top amplifiers, combiners, antennas.
In a preferred embodiment of the present invention, when the antenna feeder link includes a multi-radio frequency system combiner, the apparatus may further mount a link from an antenna port of the multi-radio frequency system combiner to an antenna through a cable of 0-1 meter, so as to cancel a passive intermodulation signal generated at the antenna port of the multi-radio frequency system combiner and a component of the passive intermodulation signal generated at any device or component in the link behind the antenna port of the multi-radio frequency system combiner falling into a receiving frequency band, thereby achieving a passive intermodulation preset index; the specific length of the cable in the range of 0 to 1 meter is determined by the passive intermodulation cancellation best effect.
The invention also discloses a wireless transceiver capable of adaptively counteracting the passive intermodulation signal, and a device for adaptively counteracting the passive intermodulation signal in the wireless transceiver system is arranged in the wireless transceiver.
In a preferred embodiment of the present invention, when the wireless transceiver device transmits a signal frequency discrimination signal or a known transmission signal frequency, the apparatus for adaptively canceling a passive intermodulation signal in a wireless transceiver system is composed of a cancellation coupler, a detection coupler, a canceller circuit, a passive intermodulation cancellation detection circuit and a digital processing control unit; the counteracting coupler is directly connected with an antenna port of a passive device in the wireless transceiving equipment; the detection coupler is arranged on a radio frequency receiving link of the wireless transceiving equipment; the passive intermodulation cancellation detection circuit comprises a low-noise amplifier, a radio frequency amplifier circuit, a frequency mixer, a local oscillator, an intermediate frequency filter, a digital controllable gain amplifier and an analog-to-digital converter.
In a preferred embodiment of the present invention, when a low noise amplifier and a radio frequency amplifier are provided within the transceiver device, the passive intermodulation cancellation detection circuit shares the low noise amplifier and the radio frequency amplifier with the transceiver device.
In a preferred embodiment of the present invention, when a digital processing control unit is disposed in the wireless transceiver device, the apparatus for adaptively canceling a passive intermodulation signal in a wireless transceiver system shares the digital processing control unit with the wireless transceiver device.
In a preferred embodiment of the present invention, when the wireless transceiver system includes, but is not limited to, multiple devices or components such as a wireless transceiver device, a tower top amplifier, a radio frequency transceiver link combiner, a multi-radio frequency system combiner, and an antenna, a component that causes passive intermodulation generated by the wireless transceiver device and generated by any device or component in a link behind an antenna port of the wireless transceiver device to fall into a receiving frequency band can be cancelled, and a result that is better than a predetermined passive intermodulation requirement index is obtained on a receiving link in the wireless transceiver device; the radio transceiver device includes, but is not limited to, a radio transceiver device, a base station device with a transceiver, and a radio station device.
The invention also discloses a method for self-adaptively counteracting the passive intermodulation signal in the wireless transceiving system, which comprises the following steps of 1, transmitting a signal for frequency discrimination and calculating the passive intermodulation digital filtering parameter; 2. solving a passive intermodulation signal amplitude value by using the passive intermodulation digital filtering parameter calculated in the step 1; 3. judging whether passive intermodulation signal cancellation is needed or not and cancellation processing when the passive intermodulation signal cancellation is needed by using the passive intermodulation signal amplitude value calculated in the step 2; in the operation process according to the steps, a method for realizing frequency discrimination of the transmitting signal and calculating the passive intermodulation digital filtering parameter, a method for judging whether to enter a passive intermodulation cancellation working state or not according to the passive intermodulation detection value and a method for detecting the passive intermodulation signal and calculating the cancellation control quantity are formed.
In a preferred embodiment of the present invention, the method for frequency discrimination of the transmitted signal and calculation of the passive intermodulation digital filtering parameters comprises the following steps, SC 1: inputting the bandwidth and frequency band of a transmitting signal, the bandwidth and frequency band of a receiving signal, the order and frequency band information of a main interference component in a passive intermodulation signal, an expected passive intermodulation preset value, initial empirical data of a curve, an amplitude and a phase which change along with time, the maximum offset times and the like through a human-computer interface of a digital processing control unit E, and converting the initial empirical data into corresponding configuration parameters; SC 2: for the transmitting signal coupled by the frequency discrimination coupler, the transmitting signal frequency discrimination circuit converts the transmitting signal into a digital signal and inputs the digital signal into the digital processing control unit; SC 3: the digital processing control unit performs filtering and screening processing on the sampling signal acquired in the step SC2 according to the configuration parameters of the relevant transmitting signal in the step SC 1; SC 4: calculating a transmitting signal frequency point of the data processed by the step SC 3; SC 5: comparing the frequency point value of the transmitting signal calculated in the step SC4 with the frequency point value calculated in the previous time to judge whether the frequency point of the current transmitting signal changes; SC 6: if the judgment result of the step SC5 is 'yes', obtaining the frequency points of the third-order, fifth-order and seventh-order passive intermodulation signals by utilizing the relationship between the third-order, fifth-order and seventh-order passive intermodulation signals and the transmitting signals according to the calculation result of the SC 4; SC 7: the digital processing control unit configures screening conditions by a table look-up method according to the frequency band configuration information of the received signal and the order configuration information of the passive intermodulation interference signal in the step SC1, and screens the frequency point of the passive intermodulation signal falling into the receiving frequency band; SC 8: converting the calculation result of SC7 into a passive intermodulation signal digital filtering parameter and storing the parameter into a parameter configuration table; updating parameters of the frequency points of the transmitted signals in the parameter configuration table; and returns to step SC 2; SC 9: if the judgment result of the step SC5 is 'no', the digital filtering parameter of the previous passive intermodulation signal and the frequency point parameter of the transmitting signal in the parameter configuration table are kept; and returns to step SC 2.
In a preferred embodiment of the present invention, the method for determining whether to enter the passive intermodulation cancellation operating state according to the passive intermodulation detection value includes the following steps, S1: inputting the bandwidth and frequency band of a transmitting signal, the bandwidth and frequency band of a receiving signal, the order and frequency band information of a main interference component in a passive intermodulation signal, an expected passive intermodulation preset value, initial empirical data of a curve, an amplitude and a phase which change along with time, the maximum offset times and the like through a man-machine interface of a digital processing control unit, and converting the initial empirical data into corresponding configuration parameters; s2: according to the configuration parameters of the transmitting signals in the step S1, the digital processing control unit calculates the sampling signals of the transmitting signal frequency discrimination circuit, obtains the frequency points of the passive intermodulation signals, converts the frequency points into corresponding digital filtering parameters and stores the parameters into a parameter configuration table; s3: according to the configuration parameters related to the received signal, the configuration parameters of the passive intermodulation signal and the digital filtering parameters of the passive intermodulation signal obtained in the step S2 in the step S1, the digital processing control unit performs digital filtering on the sampling signal of the passive intermodulation cancellation detection circuit, filters out other signal components except the passive intermodulation signal, and obtains the amplitude value of the passive intermodulation signal falling into the receiving frequency band; s4: judging the current working state; the state identification default values of the working states are: "do not enter passive intermodulation cancellation mode of operation"; if the state identification value of the working state is 'not entering the passive intermodulation cancellation working mode', continuing the following steps, otherwise, ending the logic; s5: comparing the passive intermodulation signal amplitude value calculated in the step S3 with the passive intermodulation preset value in the step S1 to determine whether the passive intermodulation signal amplitude is less than or equal to the passive intermodulation preset value; s6: if the judgment result of the step S5 is yes, the canceller circuit continues to maintain the high isolation state of the link between the intermodulation signal generator and the cancellation coupler; and returns to step S2; s7: if the determination result of step S5 is "no", the canceller circuit will be switched to: a link low isolation state between the intermodulation signal generator and the cancellation coupler; and setting the state identifier in step S4 as "enter passive intermodulation cancellation mode of operation", and ending the logic.
In a preferred embodiment of the present invention, the method for detecting the passive intermodulation signals and calculating the cancellation control quantity comprises the following steps, SD 1: inputting the bandwidth and frequency band of a transmitting signal, the bandwidth and frequency band of a receiving signal, the order and frequency band information of a main interference component in a passive intermodulation signal, an expected passive intermodulation preset value, initial empirical data of a curve, an amplitude and a phase which change along with time, the maximum offset times and the like through a man-machine interface of a digital processing control unit, and converting the initial empirical data into corresponding configuration parameters; SD 2: for the signals coupled by the detection coupler, the passive intermodulation cancellation detection circuit firstly filters the transmitting signals, then converts the transmitting signals into digital signals and inputs the digital signals into the digital processing control unit; SD 3: according to the configuration parameters related to the received signal, the configuration parameters of the passive intermodulation signal and the passive intermodulation digital filtering parameters obtained in the step 1 in the step SD1, the digital processing control unit performs digital filtering and operation on the sampling signal of the passive intermodulation cancellation detection circuit to obtain an amplitude value of the passive intermodulation signal falling into the receiving frequency band; SD 4: judging the current working state; if the state identification value of the working state is 'entering the passive intermodulation cancellation working mode', continuing the following steps, otherwise, ending the logic; the state identification default values of the working states are: "do not enter passive intermodulation cancellation mode of operation"; SD 5: comparing the passive intermodulation signal amplitude value calculated in the step SD3 with the passive intermodulation preset value in the step SD1 to judge whether the passive intermodulation signal amplitude is less than or equal to the passive intermodulation preset value; SD 6: if the judgment result of the step SD5 is 'yes', the amplitude and phase adjustment values allocated to the canceller circuit in the previous time are kept and the step SD2 is returned; SD 7: if the judgment result of the step SD5 is 'NO', obtaining the amplitude and phase adjustment value of the canceller circuit according to the processing result of the SD 3; if the judgment result is no for a plurality of times and the number of times exceeds the maximum cancellation number in the step SD1, setting the state identification value in the step SD4 as 'not entering the passive intermodulation cancellation mode of operation', and ending the adjustment; SD 8: distributing the amplitude and phase adjustment values obtained in the step SD6 to an amplitude modulation phase modulator in a canceller circuit B; and returns to step SD 2.
Compared with the background technology, the invention has the beneficial effects that:
1. the passive intermodulation cancellation effect generating device can be used outside a wireless transceiver device or integrated in the wireless transceiver device, and the position generating the passive intermodulation cancellation effect is positioned near an antenna port of a passive device in the wireless transceiver device, so that a passive intermodulation signal generated by the wireless transceiver device and a component, which is generated by any device or component in a link behind the antenna port of the wireless transceiver device and falls into a receiving frequency band, can be guaranteed to be cancelled near the antenna port of the passive device in the wireless transceiver device, and a result which is better than a preset passive intermodulation requirement index is obtained at a receiving port of the passive device;
2. the passive intermodulation cancellation signals are derived from the transmitting signals of the wireless transceiving equipment, so that the passive intermodulation cancellation signals can correspond to the passive intermodulation signals of each order generated by the transmitting signals, and the corresponding passive intermodulation cancellation signals can be selected according to the passive intermodulation signal interference points in the practical application environment of the wireless transceiving equipment;
3. due to the adoption of the active intermodulation cancellation circuit, the adjustment of the phase and the amplitude of the signal can be quantized, and the adjustment precision and the accuracy are improved;
4. due to the adoption of the feedback link of the passive intermodulation signal cancellation effect, the passive intermodulation signal cancellation effect can be monitored in real time and dynamically adjusted in a self-adaptive manner, so that when the power level and the working frequency of a signal passing through the passive device or a subsequent link are changed and the environment temperature and the like are changed, the passive intermodulation signal cancellation effect can be responded dynamically and in real time, and the passive intermodulation signal cancellation result meets an expected target value. Thereby having important practical significance.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for adaptively canceling passive intermodulation generated in a wireless transceiving system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a feed circuit a7 in a multi-group coupler a according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a second configuration of a multi-group coupler a according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating the intermodulation cancellation principle of the operating principle of the amplitude modulation circuit 1 of the canceller circuit B in the passive intermodulation cancellation apparatus according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of a second configuration of a canceller circuit B in the passive intermodulation cancellation apparatus according to the embodiment of the present invention.
Fig. 6 is a flowchart of a method for determining whether to enter a passive intermodulation cancellation operating state according to a passive intermodulation detection value in an embodiment of the present invention.
Fig. 7 is a flow chart of a method for frequency discrimination of a transmitted signal and calculation of passive intermodulation digital filter parameters in an embodiment of the present invention.
Fig. 8 is a flow chart of a method of passive intermodulation signal detection and cancellation control quantity calculation in an embodiment of the present invention.
FIG. 9 is a diagram of an example of the use of a single RF link of a passive intermodulation cancellation device in an embodiment of the present invention
Fig. 10 is a schematic diagram of one example of the use of the multi-rf link of the passive intermodulation cancellation device in the embodiment of the present invention.
Fig. 11 is a schematic diagram of one example of a passive intermodulation cancellation apparatus in an embodiment of the present invention when used with a wireless transceiver device a1 having multiple transceiving links.
Fig. 12 is a schematic structural diagram of a wireless transceiver device for adaptively canceling a passive intermodulation signal according to an embodiment of the present invention.
Fig. 13 is a schematic diagram of the position of the passive intermodulation cancellation detection circuit for acquiring signals in the embodiment of the present invention.
Detailed Description
The first embodiment is as follows:
the embodiment, as shown in fig. 1 of the specification, relates to a passive intermodulation cancellation device installed outside a wireless transceiver a1, the device includes a plurality of sets of couplers a, a canceller circuit B, a transmit signal discriminator circuit C, a passive intermodulation cancellation detection circuit D, a digital processing control unit E;
a port ① in a plurality of groups of couplers A in the passive intermodulation cancellation device is connected with an antenna port of a wireless transceiver A1, and the other port ② is connected with an antenna A3 through a cable, the plurality of groups of couplers A couple out radio frequency signals on a link from the antenna port of the wireless transceiver A1 to an antenna A3, and the radio frequency signals are divided into three paths and respectively output to a canceller circuit B, a transmitting signal frequency discrimination circuit C and a passive intermodulation cancellation detection circuit D;
a cancellation coupler A4 in the multiple groups of couplers A couples and outputs a radio-frequency signal on a stripline cable A2 to a canceller circuit B in the passive intermodulation cancellation device, and a first intermodulation cancellation signal which is the same as the passive intermodulation signal frequency point of the wireless transceiver A1 is generated on an intermodulation signal generator B2 through an amplitude modulation phase modulator B1; after the first intermodulation cancellation signal is reflected at the tail end of the canceller circuit B, the first intermodulation cancellation signal is processed again through an amplitude modulation phase modulator B1 to generate a first power signal; the first power signal is then coupled from cancellation coupler a4 back to stripline cable a2 to form a second power signal comprising a second intermodulation cancellation signal, the second power signal being superimposed with the radio frequency signals in the plurality of sets of couplers a, the second intermodulation cancellation signal in the second power signal having the same frequency, level and opposite phase as the passive intermodulation signal generated by the wireless transceiver device a 1; the amplitude modulation phase modulator B1 processes the signal by the amplitude and phase control parameters output by the digital processing control unit E.
A frequency discrimination coupler A5 in the multiple-group coupler A couples and outputs a radio frequency signal on a strip line cable A2 to the transmitting signal frequency discrimination circuit C, the radio frequency signal is subjected to frequency mixing with a local oscillator C3 through an attenuator C1, the frequency mixer C2 converts the transmitting signal from the radio frequency signal into an intermediate frequency signal, and the intermediate frequency signal is converted into a digital signal through an analog-to-digital converter C6 after being adjusted by an intermediate frequency filter C4 with a passband bandwidth equal to the transmitting bandwidth and a digital controllable gain amplifier C5, so that the transmitting signal is sampled; the sampling signal is input to a digital processing control unit E, digital filtering processing and calculation are carried out, a specific transmitting signal frequency point of a known transmitting signal working frequency band is obtained, and then a frequency point value of a passive intermodulation of the wireless transceiver A1 falling into a receiving frequency band component is obtained, and the frequency point value is used as a digital filtering parameter of a digital signal output by a passive intermodulation offset detection circuit D;
the detection coupler A6 in the multiple groups of couplers A couples and outputs the radio-frequency signals on the stripline cable A2 to the passive intermodulation cancellation detection circuit D, firstly passes through a radio-frequency filter D1 with a passband of a received signal frequency band and a stopband of a transmitted signal frequency band, passes through a low-noise amplifier D2, passes through a radio-frequency filter D3 with a passband of a received signal frequency band and a stopband of a transmitted signal frequency band, passes through a radio-frequency amplifier circuit D4, and is input to a mixer D5 to mix with the signals of the local oscillator D6, the radio-frequency signals are converted into intermediate-frequency signals, the intermediate-frequency signals are adjusted by an intermediate-frequency filter D7 and a digital controllable gain amplifier D8 with a passband bandwidth equal to the receiving bandwidth, and then are converted into digital signals by an analog-to-digital converter D9, and the sampling of the; the sampling signal is input into a digital processing control unit E, digital filtering processing and calculation are carried out, and a first passive intermodulation signal detection value which corresponds to a passive intermodulation signal generated by the wireless transceiver A1 and falls into a receiving frequency band component is obtained;
the digital processing control unit E firstly obtains a passive intermodulation preset value through a human-computer interface, when the first passive intermodulation signal detection value is less than or equal to the passive intermodulation preset value, the amplitude modulation circuit 1 in the canceller circuit B is kept in a default set first attenuation value state, the first attenuation value enables an intermodulation signal generator B2 in the canceller circuit B not to generate intermodulation cancellation signals and not to influence a passive intermodulation index of the wireless transceiver device A1, and the first attenuation value is larger than 40 dB; when the first passive intermodulation signal detection value is larger than a preset passive intermodulation preset value, the digital processing control unit E calculates the amplitude control quantity and the phase control quantity of the amplitude modulation and phase modulation device B1 in the canceller circuit B by using a two-dimensional minimum value algorithm according to the first passive intermodulation signal detection value, so that a component falling into a receiving frequency band in the second intermodulation cancellation signal generated by the canceller circuit B and a component falling into the receiving frequency band in the passive intermodulation signal generated by the wireless transceiver device a1 have the same level and opposite phase, and the passive intermodulation preset value is met.
In this embodiment, the multiple sets of couplers a need to be installed between the antenna ports of the passive device a0 in the wireless transceiving equipment a1 and the antennas, and the ports ① of the multiple sets of couplers a need to be connected with the antenna ports of the passive device a0 in the wireless transceiving equipment a1 and the distance needs to be controlled within 0 to 1 meter;
a first structure of the multiple coupler a according to this embodiment is shown in fig. 1, and is composed of a stripline cable a2, a cancellation coupler a4, a frequency discrimination coupler a5, a detection coupler a6, and a feeding circuit a 7; wherein the feed circuit A7 is closest to the antenna port side of the wireless transceiving equipment A1; the discriminating coupler a5 is between the canceling coupler a4 and the detecting coupler a6, the detecting coupler a6 being closest to the antenna A3 side; the counteracting coupler A4, the frequency discrimination coupler A5 and the detection coupler A6 are all positive coupling outputs, and the isolation range between positive coupling ports is more than 70 dB; the degree of coupling of the cancellation coupler a4 ranges from 25dB to 45 dB; the coupling degree of the frequency discrimination coupler A5 ranges from 30dB to 50 dB; the coupling degree of the detection coupler A6 ranges from 25dB to 35 dB; the stripline cables a2 in the multi-group coupler a include, but are not limited to, coaxial cables, microstrip lines, striplines, coaxial rods;
referring to fig. 2, in the present embodiment, the feeding circuit a7 is composed of a coaxial feeding main rod a10 and a feeding inductor a 11; when a passive device A0 antenna port in the wireless transceiver A1 is provided with a power supply circuit, the coaxial feed main rod A10 gets power from the passive device A0 antenna port interface, the feed inductor A11 guides the power from the coaxial feed main rod A10 into the numerical control board unit 3 in the passive intermodulation offset device, and the feed inductor A11 plays a role in isolating and transmitting signals; the coaxial feed main rod A10 and the stripline cable A2 are isolated by polytetrafluoroethylene in a direct current mode, and the distance between the coaxial feed main rod A10 and the stripline cable A2 is 0.4 mm to 1.1 mm; the feeding mode enables the multiple groups of couplers A to obtain better passive intermodulation characteristics;
in addition, in the present embodiment, the multiple coupler a has a second configuration, referring to fig. 3, the multiple coupler a is composed of a stripline cable a2, a cancellation coupler a4, a frequency discrimination coupler a5, a detection coupler A6, and a feeding circuit a7, wherein the feeding circuit a7 and the feeding circuit a7 in the first multiple coupler a maintain the same position and structure, the detection coupler A6 is adjacent to the feeding circuit a7, and the coupling output is a reverse coupling output with a coupling degree ranging from 25dB to 35dB, the cancellation coupler a4 is located between the detection coupler A6 and the frequency discrimination coupler a5, and the frequency discrimination coupler a5 is closest to the port ② of the stripline cable a 2;
the first structure of the canceller circuit B described in this embodiment is shown in fig. 1, and its rf input and output share a port, and are formed by connecting an am phase modulator B1 and an intermodulation signal generator B2 in series.
The amplitude modulation and phase modulation device B1 of the embodiment is formed by connecting an amplitude modulation circuit 1 and a phase modulation circuit 2 in series; the amplitude modulation circuit 1 in the amplitude modulation phase modulator B1 consists of a fixed attenuator and a voltage-controlled variable gain attenuator;
the intermodulation signal generator B2 described in this embodiment is formed by grounding or opening the anode of a diode; the frequency of an intermodulation signal generated by a transmitting signal in the radio frequency signal on an intermodulation signal generator B2 is the same as the frequency of a passive intermodulation signal in the radio frequency signal, and the amplitude value of the intermodulation signal is more than or equal to the sum of the passive intermodulation signal amplitude value in the radio frequency signal and the coupling degree of a cancellation coupler A4;
in addition, the canceller circuit B in the present embodiment has a second configuration, and referring to fig. 4, the canceller circuit B is composed of a radio frequency switch B3, an am phase modulator B1, and an intermodulation signal generator B2 connected in series; the default state of the radio frequency switch B1 is a state of connecting a 50 ohm load;
in addition, the canceller circuit B in the present embodiment has a third configuration, and referring to fig. 5, the canceller circuit B is formed by connecting a radio frequency switch B3, a circulator 4, an amplitude modulation phase modulator B1, a circulator 5, an amplitude modulation phase modulator B4, and an intermodulation signal generator B2 in series; the connection between the canceller circuit B and the cancelling coupler A4 can be realized through the radio frequency switch B3 or directly; the amplitude modulation phase modulator B1 only comprises an amplitude modulation circuit 1 under the structure;
referring to fig. 1, the transmission signal frequency discriminator C of the present embodiment is composed of an attenuator C1, a mixer C2, a local oscillator C3 for frequency mixing, an intermediate frequency filter C4, a digital controllable gain amplifier C5, and an analog-to-digital converter C6; the passband bandwidth of the intermediate frequency filter C4 is equal to the transmission bandwidth;
referring to fig. 1, the passive intermodulation cancellation detection circuit D of the present embodiment is composed of a radio frequency filter D1, a low noise amplifier D2, a radio frequency filter D3, a radio frequency amplifier circuit D4, a mixer D5, a local oscillator D6, an intermediate frequency filter D7, a digital controllable gain amplifier D8, and an analog-to-digital converter D9; the pass band of both the rf filter D1 and the rf filter D3 is the receive signal band and the stop band is the transmit signal band; the passband bandwidth of the intermediate frequency filter D7 is equal to the reception bandwidth; the gain value range of a link from the input port of the passive intermodulation cancellation detection circuit D to the input port of the analog-to-digital converter D9 in the passive intermodulation cancellation detection circuit D is 80-120 dB;
referring to fig. 1, the digital processing control unit E according to the present embodiment is formed by a digital signal processor as a core device, including but not limited to a field programmable gate array device, a central processing unit, a digital signal processor, etc.; an interface exists between the digital processing control unit E and the canceller circuit B to transmit the control quantity of amplitude and phase to an amplitude modulation phase modulator B1 in the canceller circuit B; an interface is arranged between the digital processing control unit E and the transmitting signal frequency discrimination circuit C so as to obtain a sampling signal of the transmitting signal frequency discrimination circuit C, carry out digital filtering and frequency identification on the transmitting signal and finally calculate the frequency point of the passive intermodulation signal; an interface is arranged between the digital processing control unit E and the passive intermodulation cancellation detection circuit D so as to obtain a sampling signal of the passive intermodulation cancellation detection circuit D, carry out digital filtering and amplitude calculation on the passive intermodulation signal, and control the amplitude and the phase of an amplitude modulation phase modulator B1 in the canceller circuit B according to the calculated amplitude value; the digital processing control unit E is a human-computer interaction interface and has the functions of, but not limited to, program downloading, configuration information input, remote alarm and maintenance. The configuration information to be input comprises a transmitting signal bandwidth and frequency band, a receiving signal bandwidth and frequency band, order and frequency band information of main interference components in the passive intermodulation signals, a passive intermodulation signal preset value, a curve changing along with time, maximum offset times and the like;
the present embodiment includes a method for adaptively canceling a passive intermodulation signal in a wireless transceiving system, comprising: the method comprises the following steps of 1, transmitting signals for frequency discrimination and calculating passive intermodulation digital filtering parameters; step 2, solving a passive intermodulation signal amplitude value by using the passive intermodulation digital filtering parameter calculated in the step 1; step 3, judging whether passive intermodulation signal cancellation is needed or not and cancellation processing is needed when the passive intermodulation signal amplitude value calculated in the step 2 is needed; in addition, in the operation process according to the steps, a method for realizing frequency discrimination of the transmitting signal and calculating the passive intermodulation digital filtering parameter, a method for judging whether to enter a passive intermodulation cancellation working state or not according to the passive intermodulation detection value and a method for detecting the passive intermodulation signal and calculating the cancellation control quantity are formed.
Referring to fig. 7, a method of transmit signal frequency discrimination and calculating passive intermodulation digital filter parameters includes the steps of, SC 1: inputting the bandwidth and frequency band of a transmitting signal, the bandwidth and frequency band of a receiving signal, the order and frequency band information of a main interference component in a passive intermodulation signal, an expected passive intermodulation preset value, initial empirical data of a curve, an amplitude and a phase which change along with time, the maximum offset times and the like through a human-computer interface of a digital processing control unit E, and converting the initial empirical data into corresponding configuration parameters; SC 2: for the transmitting signal coupled by the frequency discrimination coupler A5, the transmitting signal frequency discrimination circuit C converts the transmitting signal into a digital signal and inputs the digital signal into the digital processing control unit E; SC 3: the digital processing control unit E performs filtering and screening processing on the sampling signal obtained in the step SC2 according to the configuration parameters of the transmission signal in the step SC 1; SC 4: calculating a transmitting signal frequency point of the data processed by the step SC 3; SC 5: comparing the frequency point value of the transmitting signal calculated in the step SC4 with the frequency point value calculated in the previous time to judge whether the frequency point of the current transmitting signal changes; SC 6: if the judgment result of the step SC5 is 'yes', obtaining the frequency points of the third-order, fifth-order and seventh-order passive intermodulation signals by utilizing the relationship between the third-order, fifth-order and seventh-order passive intermodulation signals and the transmitting signals according to the calculation result of the SC 4; SC 7: the digital processing control unit E configures a screening condition by a table look-up method according to the frequency band configuration information about the received signal and the order configuration information of the passive intermodulation interference signal in step SC1, and screens the frequency point of the passive intermodulation signal falling into the receiving frequency band; SC 8: converting the calculation result of SC7 into a passive intermodulation signal digital filtering parameter and storing the parameter into a parameter configuration table; updating parameters of the frequency points of the transmitted signals in the parameter configuration table; and returns to step SC 2; SC 9: if the judgment result of the step SC5 is 'no', the digital filtering parameter of the previous passive intermodulation signal and the frequency point parameter of the transmitting signal in the parameter configuration table are kept; and returns to step SC 2.
Referring to fig. 6, a method for adaptively canceling a passive intermodulation signal in a wireless transceiving system includes the steps of, S1: inputting the bandwidth and frequency band of a transmitting signal, the bandwidth and frequency band of a receiving signal, the order and frequency band information of a main interference component in a passive intermodulation signal, an expected passive intermodulation preset value, initial empirical data of a curve, an amplitude and a phase which change along with time, the maximum offset times and the like through a human-computer interface of a digital processing control unit E, and converting the initial empirical data into corresponding configuration parameters; s2: according to the configuration parameters of the transmitting signals in the step S1, the digital processing control unit E calculates the sampling signals of the transmitting signal frequency discrimination circuit C to obtain the frequency points of the passive intermodulation signals and converts the frequency points into corresponding digital filter parameters to be stored in the parameter configuration table; s3: according to the configuration parameters related to the received signal, the configuration parameters of the passive intermodulation signal and the digital filtering parameters of the passive intermodulation signal obtained in the step S2 in the step S1, the digital processing control unit E performs digital filtering on the sampling signal of the passive intermodulation cancellation detection circuit D, filters out other signal components except the passive intermodulation signal, and obtains the amplitude value of the passive intermodulation signal falling into the receiving frequency band; s4: judging the current working state; the state identification default values of the working states are: "do not enter passive intermodulation cancellation mode of operation"; if the state identification value of the working state is 'not entering the passive intermodulation cancellation working mode', continuing the following steps, otherwise, ending the logic; s5: comparing the passive intermodulation signal amplitude value calculated in the step S3 with the passive intermodulation preset value in the step S1 to determine whether the passive intermodulation signal amplitude is less than or equal to the passive intermodulation preset value; s6: if the judgment result of the step S5 is yes, the canceller circuit B continues to maintain the high isolation state of the link between the intermodulation signal generator and the cancellation coupler, and returns to the step S2; s7: if the determination result of step S5 is "no", the canceller circuit B will be switched to: a link low isolation state between the intermodulation signal generator and the cancellation coupler; and setting the state identifier in step S4 as "enter passive intermodulation cancellation mode of operation", and ending the logic.
Referring to fig. 8, a method for adaptively canceling a passive intermodulation signal in a wireless transceiving system comprises the steps of, SD 1: inputting the bandwidth and frequency band of a transmitting signal, the bandwidth and frequency band of a receiving signal, the order and frequency band information of a main interference component in a passive intermodulation signal, an expected passive intermodulation preset value, initial empirical data of a curve, an amplitude and a phase which change along with time, the maximum offset times and the like through a human-computer interface of a digital processing control unit E, and converting the initial empirical data into corresponding configuration parameters; SD 2: for the signals coupled by the detection coupler A6, the passive intermodulation cancellation detection circuit D firstly filters the emission signals, then converts the emission signals into digital signals and inputs the digital signals into the digital processing control unit E; SD 3: according to the configuration parameters related to the received signal, the configuration parameters of the passive intermodulation signal and the passive intermodulation digital filtering parameters obtained in the step 1 in the step SD1, the digital processing control unit E performs digital filtering and operation on the sampling signal of the passive intermodulation cancellation detection circuit D to obtain an amplitude value of the passive intermodulation signal falling into the receiving frequency band; SD 4: judging the current working state; if the state identification value of the working state is 'entering the passive intermodulation cancellation working mode', continuing the following steps, otherwise, ending the logic; the state identification default values of the working states are: "do not enter passive intermodulation cancellation mode of operation"; SD 5: comparing the passive intermodulation signal amplitude value calculated in the step SD3 with the passive intermodulation preset value in the step SD1 to judge whether the passive intermodulation signal amplitude is less than or equal to the passive intermodulation preset value; SD 6: if the judgment result in the step SD5 is yes, the amplitude and phase adjustment values previously allocated to the canceller circuit B are maintained and the process returns to the step SD 2; SD 7: if the judgment result of the step SD5 is 'NO', obtaining the amplitude and phase adjustment value of the canceller circuit B according to the processing result of the SD 3; if the judgment result is no for a plurality of times and the number of times exceeds the maximum cancellation number in the step SD1, setting the state identification value in the step SD4 as 'not entering the passive intermodulation cancellation mode of operation', and ending the adjustment; SD 8: distributing the amplitude and phase adjustment values obtained in the step SD6 to an amplitude modulation phase modulator B1 in a canceller circuit B; and returns to step SD 2.
In addition, the schematic diagram of the passive intermodulation cancellation device described in this embodiment, which is one of the use examples of the single radio frequency link, is shown in fig. 9 of the specification, wherein the whole link includes, but is not limited to, a wireless transceiver a1, the passive intermodulation cancellation device, a tower top amplifier a7, an antenna A3, a connecting cable, etc., and the connecting distance between the port ① of the passive intermodulation cancellation device and the antenna port of the wireless transceiver a1 is in the range of 0 to 1 meter;
in addition, the schematic diagram of the passive intermodulation cancellation device in one of the usage examples of the multi-radio frequency link is shown in the attached figure 10 in the specification, wherein the whole link comprises a plurality of wireless transceiving equipment A1-1, A1-2 and … …, a plurality of passive intermodulation cancellation devices, a multi-radio frequency system combiner A8, an antenna A3, a connecting cable and the like, each single branch is provided with one passive intermodulation cancellation device connected with the single transceiving link of the wireless transceiving equipment, and the connection distance between the port ① of the passive intermodulation cancellation device and the antenna port of the wireless transceiving equipment is in the range of 0 to 1 meter;
in addition, the schematic diagram of one of the use examples of the passive intermodulation cancellation device in the embodiment is shown in fig. 11 in the specification when the wireless transceiver device has a plurality of transceiving links, wherein the whole link comprises the wireless transceiver device a1, a plurality of passive intermodulation cancellation devices, a plurality of antennas A3-1, A3-2, … …, a connecting cable and the like, and each single transceiving link of the wireless transceiver device is connected with one passive intermodulation cancellation device, wherein the connecting distance between the port ① of the passive intermodulation cancellation device and the antenna port of the wireless transceiver device is in the range of 0 to 1 meter;
after the passive intermodulation cancellation device is arranged on a link of a wireless transceiving system, when the passive intermodulation of the link is-80 dBm/Hz to-95 dBm/Hz, the device can enable the cancellation result of the passive intermodulation signal to be more than 20dB, and when the passive intermodulation of the link is better than-95 dBm/Hz, the device can enable the cancellation result of the passive intermodulation signal to be at least better than-115 dBm/Hz;
example two:
a second embodiment, as shown in fig. 12 of the specification, relates to a wireless transceiver a1 having a passive intermodulation cancellation apparatus installed therein, wherein the passive intermodulation cancellation apparatus includes a cancellation coupler a4, a detection coupler a6, a canceller circuit B, a transmit signal frequency discriminator circuit C, a passive intermodulation cancellation detection circuit D, and a digital processing control unit E;
the counteracting coupler A4 is closely adjacent to the antenna port of the passive device A0 in the wireless transceiving equipment A1, a small part of radio frequency signals on a link are coupled out, and the coupled radio frequency signals are output to a counteracting device circuit B; the detection coupler A6 forwards couples signals from a receiving link of the wireless transceiver A1, and the coupled receiving signals are output to the passive intermodulation cancellation detection circuit D;
the canceller circuit B comprises an amplitude modulation phase modulator B1 and an intermodulation signal generator B2, and the port shared by the phase modulation phase modulator B1 and the intermodulation signal generator B2 and the radio frequency input and output between the phase modulation phase modulator B and the cancellation coupler A4 is called an input and output port; after the canceller circuit B obtains a coupled radio frequency signal from the input/output port, an amplitude modulation phase modulator B1 performs first processing on the radio frequency signal, and after the first processing, the intermodulation signal generator B2 generates a first intermodulation cancellation signal with the same frequency point as the passive intermodulation signal of the wireless transceiver A1; after the first intermodulation cancellation signal is reflected at the tail end of the canceller circuit B, the first intermodulation cancellation signal is subjected to second processing by an amplitude modulation phase modulator B1 to generate a first power signal; the first power signal is then coupled from the input/output port back to an original signal acquisition site through a cancellation coupler a4 to form a second power signal containing a second intermodulation cancellation signal, the second power signal is superimposed with the radio frequency signal in the cancellation coupler a4, and a second intermodulation cancellation signal in the second power signal has the same frequency, level and opposite phase as a passive intermodulation signal generated by a transmitting signal of the wireless transceiver a 1; the amplitude modulation phase modulator B1 processes the signal by the amplitude and phase control parameters output by the digital processing control unit E.
Since the transmit signal frequency is known to the transceiver device a1 in this embodiment, the transmit frequency point value and the corresponding digital filter parameters of the passive intermodulation sample signal will be applied directly by the digital processing control unit E;
the passive intermodulation cancellation detection circuit D comprises a low noise amplifier D2, a radio frequency amplifier circuit D4, a mixer D5, a local oscillator D6, an intermediate frequency filter D7, a digital controllable gain amplifier D8 and an analog-to-digital converter D9; the passive intermodulation cancellation detection circuit D obtains radio frequency signals from a detection coupler A6, then inputs the radio frequency signals to a low noise amplifier D2 and a radio frequency amplifier circuit D4, then inputs the radio frequency signals to a mixer D5 to mix with signals of a local oscillator D6, converts the radio frequency signals into intermediate frequency signals, and converts the intermediate frequency signals into digital signals by an analog-to-digital converter D9 after the intermediate frequency signals are adjusted by an intermediate frequency filter D7 and a digital controllable gain amplifier D8, wherein the passband bandwidth of the intermediate frequency filter is equal to the receiving bandwidth, so that the sampling of the radio frequency signals is realized; the sampling signal is input to a digital processing control unit E for signal processing to form a first sampling receiving signal, the first sampling receiving signal is input to the digital processing control unit E for digital filtering processing and calculation to obtain a first passive intermodulation signal detection value which corresponds to a passive intermodulation signal generated by the wireless transceiving equipment A1 and falls into a receiving frequency band component;
the digital processing control unit E firstly obtains a passive intermodulation preset value through a human-machine interface, and when the first passive intermodulation signal detection value is less than or equal to the passive intermodulation preset value, the amplitude modulation and phase modulation unit B1 in the canceller circuit B is kept in a default first attenuation value state, and the first attenuation value enables the intermodulation signal generator B2 in the canceller circuit B not to generate intermodulation cancellation signals and not to affect the passive intermodulation index of the wireless transceiver a 1; when the first passive intermodulation signal detection value is larger than a preset passive intermodulation preset value, the digital processing control unit E calculates the amplitude control quantity and the phase control quantity of the amplitude modulation and phase modulation device B1 in the canceller circuit B by using a two-dimensional minimum value algorithm according to the first passive intermodulation signal detection value, so that a component falling into a receiving frequency band in the second intermodulation cancellation signal generated by the canceller circuit B and a component falling into the receiving frequency band in the passive intermodulation signal generated by the wireless transceiver device a1 have the same level and opposite phase, and the passive intermodulation preset value is met.
In addition, in the second embodiment, referring to fig. 13, when the passive intermodulation cancellation detection circuit D obtains signals from the link between the bit ⑦ after the low noise amplifier F1 and the bit ⑧ before the mixer in the receiving link of the wireless transceiver a1, the low noise amplifier D2 in the passive intermodulation cancellation detection circuit D is omitted;
in a second embodiment, referring to fig. 13, when the passive intermodulation cancellation detection circuit D obtains a signal from port ⑥ of passive device a0 to somewhere along the segment of the link ⑧ bit before mixer F3, the link gain from port ⑥ of passive device a0 to the segment of the link D5 of passive intermodulation cancellation detection circuit D ranges from 60dB to 90 dB:
referring to fig. 12, since the wtru a1 has the dsp control unit E in the embodiment, the dsp control unit in the passive intermodulation cancellation apparatus is shared with the dsp control unit E of the wtru a 1; accordingly, the program of the passive intermodulation cancellation device is integrated into the overall program of the transceiver a 1.
After the wireless transceiver designed by the invention is installed on the link of the antenna feed system, when the passive intermodulation of the link is-80 dBm/Hz to-95 dBm/Hz, the device can enable the cancellation result of the passive intermodulation signal to be more than 20dB, and when the passive intermodulation of the link is better than-95 dBm/Hz, the device can enable the cancellation result of the passive intermodulation signal to be at least better than-115 dBm/Hz.
It should be understood that the above are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention disclosed herein should be covered within the scope of the present invention.

Claims (19)

1. A device for self-adaptively counteracting passive intermodulation signals in a wireless transceiving system comprises a plurality of groups of couplers (A), a counteractor circuit (B), a transmitting signal frequency discrimination circuit (C), a passive intermodulation counteracting detection circuit (D) and a digital processing control unit (E); the method is characterized in that:
one port of the multi-group coupler (A) is connected with an antenna port of a wireless transceiving device (A1), and the other port of the multi-group coupler (A) is connected with an antenna (A3); the multi-group coupler (A) is used for coupling out radio frequency signals from an antenna port of the wireless transceiver (A1) to a section of a link of the antenna (A3), and the radio frequency signals are divided into three paths and respectively output to the canceller circuit (B), the transmitting signal frequency discrimination circuit (C) and the passive intermodulation cancellation detection circuit (D); the radio frequency signals comprise transmitting signals, passive intermodulation signals and receiving signals;
the radio frequency signal output to the canceller circuit (B) is processed by an amplitude modulation phase modulator (B1) and an intermodulation signal generator (B2) to generate a first intermodulation cancellation signal which has the same frequency, different amplitude and different phase with the passive intermodulation signal in the radio frequency signal; after the first intermodulation cancellation signal is reflected at the tail end of the canceller circuit (B), the first intermodulation cancellation signal is processed by an amplitude modulation phase modulator (B1) again and is coupled and output to a plurality of groups of couplers (A) to form a second intermodulation cancellation signal which has the same frequency, the same amplitude and the opposite phase with the passive intermodulation signal in the radio frequency signal, the second intermodulation cancellation signal is cancelled with the passive intermodulation signal in the radio frequency signal, and the cancelled passive intermodulation cancellation signal is smaller than or equal to a passive intermodulation preset value; the adjustment of the amplitude modulation phase modulator (B1) is realized by the amplitude and phase control parameters output by the operation of a digital processing control unit (E); the passive intermodulation generated by the passive device (A0) in the wireless transceiver (A1) changes gradually along with the time, and a preset value curve of the change of the passive intermodulation along with the time is set in the device;
the transmitting signal frequency discrimination circuit (C) is used for converting coupled radio frequency signals into digital signals, inputting the digital signals into the digital processing control unit (E) for analysis and calculation to obtain specific transmitting signal frequency points of a known transmitting signal working frequency band, further obtaining frequency point values of passive intermodulation falling into receiving frequency band components of the wireless transceiving equipment (A1), and the frequency point values are converted into digital filtering parameters for processing passive intermodulation sampling signals;
the passive intermodulation cancellation detection circuit (D) is used for converting a passive intermodulation signal of the coupled wireless transceiver (A1) into a digital signal when the passive intermodulation signal falls into a receiving frequency band component, inputting the digital signal into the digital processing control unit (E), and performing digital filtering processing and calculation to realize amplitude detection of the component of the passive intermodulation signal falling into the receiving frequency band;
the digital processing control unit (E) firstly acquires a passive intermodulation preset value through a man-machine interface, and then compares the detection amplitude of the passive intermodulation signal with the passive intermodulation preset value; when the detection amplitude is smaller than or equal to the preset value, the canceller circuit (B) does not generate an intermodulation cancellation signal and does not affect a passive intermodulation index of the wireless transceiver device (A1); when the detected amplitude value is larger than the preset value, the canceller circuit (B) generates an intermodulation cancellation signal which has the same frequency, the same amplitude and the opposite phase with the passive intermodulation signal of the wireless transceiver device (A1) through the adjustment of the amplitude and the phase, and cancels the passive intermodulation signal in the radio frequency signal.
2. An apparatus for adaptively canceling passive intermodulation signals in a wireless transceiving system according to claim 1, wherein the plurality of sets of couplers (a) are made of a stripline cable (a2), a canceling coupler (a4), a frequency discrimination coupler (a5), a detecting coupler (a6) and a feeding circuit (a 7); the first port of the multi-group coupler (A) is connected with the antenna port of the passive device (A0) in the wireless transceiving equipment (A1) by a cable with the length ranging from 0 to 1 meter; the cancellation coupler (A4) is used for coupling out a radio frequency signal from a link behind an antenna port of the wireless transceiver device (A1) and outputting the radio frequency signal to the canceller circuit (B), and the coupling degree of the cancellation coupler (A4) ranges from 25dB to 45 dB; the frequency discrimination coupler (A5) is used for coupling out a radio frequency signal from a link behind an antenna port of the wireless transceiving equipment (A1) and outputting the radio frequency signal to a transmitting signal frequency discrimination circuit (C), and the coupling degree of the frequency discrimination coupler (A5) ranges from 30dB to 50 dB; the detection coupler (A6) is used for coupling out a radio frequency signal from a link behind an antenna port of the wireless transceiver device (A1) and outputting the radio frequency signal to the passive intermodulation cancellation detection circuit (D), and the coupling degree of the detection coupler (A6) ranges from 25dB to 35 dB; the isolation range among the three coupling output ports is more than 70 dB; the passive intermodulation values generated by the multiple groups of couplers (A) are smaller than a preset value; the characteristic curve of the passive intermodulation values generated by the multiple groups of couplers (A) along with the change of time is obtained through experiments; the strip line cable (A2) in the multi-group coupler (A) comprises but is not limited to coaxial cable, micro-strip line, strip line and coaxial rod.
3. The apparatus of claim 2, wherein the apparatus is configured to adaptively cancel a passive intermodulation signal in a wireless transceiver system, and further configured to: -only transmit signals of radio frequency signals coupled out of a link after an antenna aperture of a radio transceiver device (a1) by a cancellation coupler (a4) are capable of generating intermodulation cancellation signals for passive intermodulation cancellation at the intermodulation signal generator (B2), receive signals and passive intermodulation signals of the radio frequency signals not generating intermodulation cancellation signals for passive intermodulation cancellation at the intermodulation signal generator (B2);
the frequency of an intermodulation signal generated by a transmitting signal in the radio frequency signal on an intermodulation signal generator (B2) is the same as the frequency of a passive intermodulation signal in the radio frequency signal, but the amplitude value of the intermodulation signal is more than or equal to the sum of the passive intermodulation signal amplitude value in the radio frequency signal and the coupling degree of a cancellation coupler (A4);
the characteristic curve of the intermodulation signal generated by the intermodulation signal generator (B2) along with the time is obtained by experiment.
4. The apparatus of claim 2, wherein the apparatus is configured to adaptively cancel a passive intermodulation signal in a wireless transceiver system, and further configured to: the canceller circuit (B) is connected directly to the cancellation coupler (A4) or through a radio frequency switch to the cancellation coupler (A4).
5. The apparatus of claim 2, wherein the apparatus is configured to adaptively cancel a passive intermodulation signal in a wireless transceiver system, and further configured to: one end of an amplitude and phase modulation device (B1) in the canceller circuit (B) is connected with the cancelling coupler (A4), the other end of the amplitude and phase modulation device (B1) is connected with the intermodulation signal generator (B2), and the amplitude and phase modulation device (B1) comprises an amplitude modulation circuit (1) and a phase modulation circuit (2); or one end of an amplitude modulation phase modulator (B1) in the canceller circuit (B) is connected with the cancelling coupler (A4) through a first circulator (4), the other end of the amplitude modulation phase modulator (B8925) is connected with the intermodulation signal generator (B2) through a second circulator (5), and the amplitude modulation phase modulator (B1) only comprises an amplitude modulation circuit (1).
6. The apparatus of claim 2, wherein the apparatus is configured to adaptively cancel a passive intermodulation signal in a wireless transceiver system, and further configured to: intermodulation signals generated by an intermodulation signal generator (B2) in the canceller circuit (B) are reflected, pass through an amplitude modulation phase modulator (B1) and a cancellation coupler (A4) and are coupled back to the stripline cable (A2) to form passive intermodulation cancellation signals which are cancelled with the passive intermodulation signals generated in the wireless transceiver device (A1); or through the second circulator (5), the amplitude modulation phase modulator (B4), the first circulator (4), the cancellation coupler (A4), the passive intermodulation signal coupled to the stripline cable (A2) and the wireless transceiver (A1) is cancelled.
7. The apparatus of claim 1, wherein the apparatus is configured to adaptively cancel a passive intermodulation signal in a wireless transceiver system, and wherein: the transmitting signal frequency discrimination circuit (C) comprises an attenuator, a mixer circuit, an intermediate frequency filter, a digital controllable gain amplifier and an analog-to-digital converter which are sequentially connected in series; the passband bandwidth of the intermediate frequency filter is equal to the transmission bandwidth, and the mixer circuit is composed of a mixer and a local oscillator.
8. The apparatus of claim 1, wherein the apparatus is configured to adaptively cancel a passive intermodulation signal in a wireless transceiver system, and wherein: the passive intermodulation cancellation detection circuit (D) comprises a first radio frequency filter, a low noise amplifier, a second radio frequency filter, a radio frequency amplifier circuit, a frequency mixer, a local oscillator, an intermediate frequency filter, a digital controllable gain amplifier and an analog-to-digital converter; the pass band of both the first and second radio frequency filters is a receive signal band and the stop band is a transmit signal band; the passband bandwidth of the intermediate frequency filter is equal to the receiving bandwidth; the gain value range of a link from the input port of the passive intermodulation cancellation detection circuit (D) to the front of the input port of the analog-to-digital converter in the passive intermodulation cancellation detection circuit (D) is between 80 and 120 dB; each stage of signal amplification circuit is isolated by a metal cavity.
9. The apparatus of claim 1, wherein the apparatus is configured to adaptively cancel a passive intermodulation signal in a wireless transceiver system, and wherein: the digital processing control unit (E) comprises a programmable logic device, a central processing unit and a digital signal processor; an interface exists between the digital processing control unit (E) and the canceller circuit (B) to transfer the control quantity of amplitude and phase to an amplitude modulation and phase modulation device (B1) in the canceller circuit (B); an interface is arranged between the digital processing control unit (E) and the transmitting signal frequency discrimination circuit (C) so as to obtain a sampling signal of the transmitting signal frequency discrimination circuit (C), carry out digital filtering and frequency identification on the transmitting signal and finally calculate the frequency point of the passive intermodulation signal; an interface is arranged between the digital processing control unit (E) and the passive intermodulation cancellation detection circuit (D) so as to obtain a sampling signal of the passive intermodulation cancellation detection circuit (D), carry out digital filtering and amplitude calculation on the passive intermodulation signal, and control the amplitude and the phase of an amplitude modulation phase modulator (B1) in the canceller circuit (B) according to the calculated amplitude value; the digital processing control unit (E) is a man-machine interaction interface which has the functions of, but not limited to, program downloading, configuration information input, remote alarm and maintenance; the configuration information to be input comprises a transmitting signal bandwidth and frequency band, a receiving signal bandwidth and frequency band, order and frequency band information of a main interference component in the passive intermodulation signal, a passive intermodulation signal preset value, a curve changing along with time and maximum offset times;
the human-computer interaction interface can perform data interaction with internet background resources: uploading a passive intermodulation value in the operation process of the digital processing control unit (E), an experience curve of the passive intermodulation value changing along with time, and state information of each module circuit in the passive intermodulation signal self-adaptive offset device; or downloading the passive intermodulation signal preset value after comprehensive optimization and the curve changing along with time.
10. A radio transceiver system comprising means for adaptively canceling passive intermodulation signals, comprising a radio transceiver (a1) and an antenna feeder link mounted externally to the radio transceiver (a1), characterized in that: the device for adaptively canceling the passive intermodulation signal in the wireless transceiving system is arranged on an antenna feed link according to claim 1, each antenna port of the wireless transceiving equipment (A1) is connected with the device through a cable of 0-1 meter, the passive intermodulation signal generated by a passive device corresponding to each antenna port of the wireless transceiving equipment and the passive intermodulation signal generated by any equipment or component in a link behind the antenna port of the wireless transceiving equipment fall into a component of a receiving frequency band to be cancelled, and a passive intermodulation preset index is reached; the specific length of the cable in the range of 0 to 1 meter is determined by the best effect of passive intermodulation cancellation; the devices or components of each antenna feed link include, but are not limited to, cables, connectors, tower top amplifiers, combiners, antennas.
11. A wireless transceiver system comprising means for adaptively canceling passive intermodulation signals according to claim 10, wherein: when the antenna feed link comprises the multi-radio-frequency system combiner, the device can also be used for installing a link from an antenna port of the multi-radio-frequency system combiner to an antenna through a cable of 0-1 meter, and offsetting a passive intermodulation signal generated by the antenna port of the multi-radio-frequency system combiner and a component of a passive intermodulation signal generated by any device or component in the link behind the antenna port of the multi-radio-frequency system combiner, which falls into a receiving frequency band, so as to achieve a passive intermodulation preset index; the specific length of the cable in the range of 0 to 1 meter is determined by the passive intermodulation cancellation best effect.
12. A wireless transceiver device for adaptively canceling a passive intermodulation signal, comprising: the radio transceiver device (a1) is internally provided with means for adaptively cancelling passive intermodulation signals in a radio transceiver system according to claim 1.
13. The wireless transceiver apparatus of claim 12, wherein the wireless transceiver apparatus is configured to adaptively cancel passive intermodulation signals: when the wireless transceiver device (A1) transmits a signal frequency discrimination signal or a known transmitting signal frequency, the device for adaptively cancelling the passive intermodulation signal in the wireless transceiver system is composed of a cancelling coupler (A4), a detecting coupler (A6), a canceller circuit (B), a passive intermodulation cancellation detecting circuit (D) and a digital processing control unit (E); the cancellation coupler (A4) is directly connected with an antenna port of a passive device (A0) in the wireless transceiving equipment (A1); the detection coupler (A6) is installed on a radio frequency receiving link of a wireless transceiver device (A1); the passive intermodulation cancellation detection circuit (D) comprises a low noise amplifier, a radio frequency amplifier circuit, a frequency mixer, a local oscillator, an intermediate frequency filter, a digital controllable gain amplifier and an analog-to-digital converter.
14. The wireless transceiver apparatus of claim 12, wherein the wireless transceiver apparatus is configured to adaptively cancel passive intermodulation signals: when a low noise amplifier and a radio frequency amplifier are provided in the radio transceiver device (a1), the passive intermodulation cancellation detection circuit (D) shares the low noise amplifier and the radio frequency amplifier with the radio transceiver device (a 1).
15. The wireless transceiver apparatus of claim 12, wherein the wireless transceiver apparatus is configured to adaptively cancel passive intermodulation signals: when a digital processing control unit (E) is arranged in the wireless transceiving equipment (A1), the device for adaptively cancelling the passive intermodulation signal in the wireless transceiving system shares the digital processing control unit (E) with the wireless transceiving equipment (A1).
16. A transceiver apparatus according to any one of claims 12-15, wherein the transceiver apparatus is adapted to cancel passive intermodulation signals, and comprises: when the wireless transceiving system comprises a plurality of devices or components such as a wireless transceiving device (A1), a tower top amplifier, a radio frequency transceiving link combiner, a multi-radio frequency system combiner, an antenna and the like, the passive intermodulation generated by the wireless transceiving device (A1) and any device or component in a link behind an antenna port of the wireless transceiving device (A1) can be counteracted to fall into a component of a receiving frequency band, and a result which is better than a preset passive intermodulation requirement index is obtained on the receiving link in the wireless transceiving device (A1); the wireless transceiver device (A1) includes but is not limited to radio remote unit, base station device with transceiver, and radio station device.
17. A method for self-adaptively canceling a passive intermodulation signal in a wireless transceiving system is characterized in that: the method comprises the following steps of,
step 1, transmitting signals for frequency discrimination and calculating passive intermodulation digital filtering parameters;
step 2, solving a passive intermodulation signal amplitude value by using the passive intermodulation digital filtering parameter calculated in the step 1;
step 3, judging whether passive intermodulation signal cancellation is needed or not and cancellation processing when the passive intermodulation signal cancellation is needed by using the passive intermodulation signal amplitude value calculated in the step 2;
in the operation process according to the steps, a method for realizing frequency discrimination of the transmitting signal and calculating the passive intermodulation digital filtering parameter, a method for judging whether to enter a passive intermodulation cancellation working state or not according to the passive intermodulation detection value and a method for detecting the passive intermodulation signal and calculating the cancellation control quantity are formed;
the method for frequency discrimination of the transmitted signal and calculation of the passive intermodulation digital filtering parameters comprises the following steps,
SC 1: inputting the bandwidth and frequency band of a transmitting signal, the bandwidth and frequency band of a receiving signal, the order and frequency band information of a main interference component in a passive intermodulation signal, an expected passive intermodulation preset value, initial empirical data of a curve, amplitude and phase changing along with time, the maximum offset frequency and the like through a human-computer interface of a digital processing control unit (E), and converting the initial empirical data into corresponding configuration parameters;
SC 2: for the transmission signal coupled by the frequency discrimination coupler (A5), the transmission signal frequency discrimination circuit (C) converts the transmission signal into a digital signal and inputs the digital signal into the digital processing control unit (E);
SC 3: the digital processing control unit (E) carries out filtering and screening processing on the sampling signals acquired in the step SC2 according to the configuration parameters of the transmitting signals in the step SC 1;
SC 4: calculating a transmitting signal frequency point by the data processed in the step SC 3;
SC 5: comparing the frequency point value of the transmitting signal calculated in the step SC4 with the frequency point value calculated in the previous time to judge whether the frequency point of the current transmitting signal changes;
SC 6: if the judgment result of the step SC5 is 'yes', obtaining the frequency points of the third-order, fifth-order and seventh-order passive intermodulation signals by utilizing the relationship between the third-order, fifth-order and seventh-order passive intermodulation signals and the transmitting signals according to the calculation result of the SC 4;
SC 7: the digital processing control unit (E) configures screening conditions by a table look-up method according to the frequency band configuration information of the received signal and the order configuration information of the passive intermodulation interference signal in the step SC1, and screens the frequency point of the passive intermodulation signal falling into the receiving frequency band;
SC 8: converting the calculation result of SC7 into a passive intermodulation signal digital filtering parameter and storing the parameter into a parameter configuration table; updating parameters of the frequency points of the transmitted signals in the parameter configuration table; and returns to step SC 2;
SC 9: if the judgment result of the step SC5 is 'no', the digital filtering parameter of the previous passive intermodulation signal and the frequency point parameter of the transmitting signal in the parameter configuration table are kept; and returns to step SC 2.
18. The method of claim 17, wherein the method further comprises the step of: the method for judging whether to enter the passive intermodulation cancellation working state according to the passive intermodulation detection value comprises the following steps,
s1: inputting the bandwidth and frequency band of a transmitting signal, the bandwidth and frequency band of a receiving signal, the order and frequency band information of a main interference component in a passive intermodulation signal, an expected passive intermodulation preset value, initial empirical data of a curve, amplitude and phase changing along with time, the maximum offset frequency and the like through a human-computer interface of a digital processing control unit (E), and converting the initial empirical data into corresponding configuration parameters;
s2: according to the configuration parameters of the transmitting signals in the step S1, the digital processing control unit (E) calculates the sampling signals of the transmitting signal frequency discrimination circuit (C), obtains the frequency points of the passive intermodulation signals, converts the frequency points into corresponding digital filtering parameters and stores the parameters into a parameter configuration table;
s3: according to the configuration parameters related to the received signal, the configuration parameters of the passive intermodulation signal and the digital filtering parameters of the passive intermodulation signal obtained in the step S2 in the step S1, the digital processing control unit (E) performs digital filtering on the sampling signal of the passive intermodulation cancellation detection circuit (D), filters out other signal components except the passive intermodulation signal, and obtains the amplitude value of the passive intermodulation signal falling into the receiving frequency band;
s4: judging the current working state; the state identification default values of the working states are: "do not enter passive intermodulation cancellation mode of operation"; if the state identification value of the working state is 'not entering the passive intermodulation cancellation working mode', continuing the following steps, otherwise, ending the logic;
s5: comparing the passive intermodulation signal amplitude value calculated in the step S3 with the passive intermodulation preset value in the step S1 to determine whether the passive intermodulation signal amplitude is less than or equal to the passive intermodulation preset value;
s6: if the judgment result of the step S5 is yes, the canceller circuit (B) continues to maintain the high isolation state of the link between the intermodulation signal generator and the cancellation coupler; and returns to step S2;
s7: if the determination result of step S5 is "no", the canceller circuit (B) will be switched to according to the detected passive intermodulation signal amplitude value: a link low isolation state between the intermodulation signal generator and the cancellation coupler; and setting the state identifier in step S4 as "enter passive intermodulation cancellation mode of operation", and ending the logic.
19. The method of claim 17, wherein the method further comprises the step of: the method for detecting the passive intermodulation signal and calculating the cancellation control quantity comprises the following steps,
SD 1: inputting the bandwidth and frequency band of a transmitting signal, the bandwidth and frequency band of a receiving signal, the order and frequency band information of a main interference component in a passive intermodulation signal, an expected passive intermodulation preset value, initial empirical data of a curve, amplitude and phase changing along with time, the maximum offset frequency and the like through a human-computer interface of a digital processing control unit (E), and converting the initial empirical data into corresponding configuration parameters;
SD 2: for the signals coupled by the detection coupler (A6), the passive intermodulation cancellation detection circuit (D) firstly filters the transmitting signals, then converts the transmitting signals into digital signals and inputs the digital signals into a digital processing control unit (E);
SD 3: according to the configuration parameters related to the received signal, the configuration parameters of the passive intermodulation signal and the passive intermodulation digital filtering parameters obtained in the step 1 in the step SD1, the digital processing control unit (E) performs digital filtering and operation on the sampling signal of the passive intermodulation cancellation detection circuit (D) to obtain the amplitude value of the passive intermodulation signal falling into the receiving frequency band;
SD 4: judging the current working state; if the state identification value of the working state is 'entering the passive intermodulation cancellation working mode', continuing the following steps, otherwise, ending the logic; the state identification default values of the working states are: "do not enter passive intermodulation cancellation mode of operation";
SD 5: comparing the passive intermodulation signal amplitude value calculated in the step SD3 with the passive intermodulation preset value in the step SD1 to judge whether the passive intermodulation signal amplitude is less than or equal to the passive intermodulation preset value;
SD 6: if the judgment result of the step SD5 is yes, the amplitude and phase adjustment values previously allocated to the canceller circuit (B) are maintained and the process returns to the step SD 2;
SD 7: if the judgment result of the step SD5 is 'NO', obtaining the amplitude and phase adjustment value of the canceller circuit (B) according to the processing result of the SD 3; if the judgment result is no for a plurality of times and the number of times exceeds the maximum cancellation number in the step SD1, setting the state identification value in the step SD4 as 'not entering the passive intermodulation cancellation mode of operation', and ending the adjustment;
SD 8: the result of the calculation in step SD7 is distributed to the amplitude modulation phase modulator (B1) in the off-period circuit (B), and the process returns to step SD 2.
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