CN116208185A - Radio frequency interference suppression system of co-located platform equipment - Google Patents
Radio frequency interference suppression system of co-located platform equipment Download PDFInfo
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- 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
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Abstract
A radio frequency interference suppression system of co-located platform equipment acquires a reference signal from a radio frequency transmission channel through a transmission module, and then carries out delay, attenuation and phase shift processing on the reference signal through a radio frequency cancellation signal generation module, and then cancels interference signals received by a receiving module and a second antenna so as to realize interference signal suppression of the co-located platform equipment.
Description
Technical Field
The invention relates to the technical field of electromagnetic compatibility, in particular to a radio frequency interference suppression system of co-located platform equipment.
Background
The co-located platform is provided with a plurality of radio frequency devices, and when the high-power transmitting device works, the detection devices nearby the high-power transmitting device can be interfered, so that the normal work of the high-power transmitting device is affected. Therefore, effective measures are taken to suppress the interference. The existing detection equipment generally adopts passive protection measures such as a filter, a limiter and the like to provide interference protection, and the interference suppression effect is limited in the mode, and particularly when an interference signal falls in a frequency band of a receiving system, the filter can also suppress the useful signal, so that the useful signal is omitted.
In view of the foregoing, there is a need for a method for better interference signal suppression.
Disclosure of Invention
The invention aims to provide a radio frequency interference suppression system of co-located platform equipment, which can well suppress interference signals in the co-located platform equipment.
According to a first aspect, in one embodiment there is provided a radio frequency interference suppression system for co-located platform equipment, comprising:
more than two antennas; wherein the first antenna and the second antenna are adjacently arranged;
the transmitting module is used for outputting a first radio frequency signal in a radio frequency transmitting channel of the co-located platform equipment to a first antenna so that the first antenna transmits the first radio frequency signal; the transmitting module is further used for coupling part of the first radio frequency signals from the radio frequency transmitting channels of the co-located platform equipment to obtain coupled radio frequency signals;
the radio frequency cancellation signal generation module is used for acquiring the coupling radio frequency signal from the transmitting module, taking the acquired signal as a reference signal, and generating a radio frequency cancellation signal after time delay, attenuation and phase shift processing of the reference signal;
the receiving module is used for acquiring a second radio frequency signal and the radio frequency cancellation signal received by the second antenna, wherein the second radio frequency signal is transmitted by other antennas except the first antenna, the second radio frequency signal comprises an interference signal, and the interference signal is generated by part of the first radio frequency signal received by the second antenna; the receiving module is further configured to cancel an interference signal in the second radio frequency signal by using the radio frequency cancellation signal to obtain a first signal; the receiving module is further configured to output the first signal to a radio frequency receiving channel of the co-located platform device;
the control processing module is used for extracting part of the first signals from the receiving module and determining the control weight of the radio frequency cancellation signal generating module based on the extracted signals; the control processing module is further used for controlling the amplitude and the phase of the reference signal based on the control weight, so that the radio frequency cancellation signal generated by the radio frequency cancellation signal generating module can cancel the interference signal in the second radio frequency signal.
According to the radio frequency interference suppression system of the co-located platform equipment, the transmission module is used for coupling part of the first radio frequency signal from the radio frequency transmission channel to serve as a reference signal, and then the radio frequency cancellation signal generation module is used for performing delay, attenuation and phase shift processing on the reference signal, and cancellation is performed on the receiving module and the received interference signal, so that interference signal suppression of the co-located platform equipment is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a radio frequency interference suppression system of co-located platform equipment according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a multi-tap RF cancellation circuit according to one embodiment;
fig. 3 is an effect schematic diagram of a radio frequency interference suppression system of co-located platform equipment according to an embodiment of the present invention.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
In the embodiment of the invention, part of signals are extracted from the transmitted signals as reference signals, the radio frequency cancellation signals are obtained after the time delay, the attenuation and the phase shift of the reference signals are carried out by utilizing the radio frequency cancellation signal generating module, and in the receiving module, the interference signals in the received signals can be cancelled by the radio frequency cancellation signals so as to realize the radio frequency interference suppression of the co-location platform equipment.
Referring to fig. 1, an embodiment of the present invention provides a radio frequency interference suppression system of co-located platform equipment, where the radio frequency interference suppression system of co-located platform equipment includes: a transmitting module 101, a radio frequency cancellation signal generating module 102, a receiving module 103 and a control processing module 104.
In the co-located platform equipment, a plurality of antennas are generally included, for example, including a first antenna 105, a second antenna 106, a third antenna (not shown) and a fourth antenna (not shown), where the first antenna 105 transmits a first rf signal, the fourth antenna receives the first rf signal transmitted by the first antenna 105, the third antenna transmits a second rf signal, and the second antenna receives the second rf signal transmitted by the third antenna. However, since the first antenna 105 and the second antenna 106 are disposed adjacent to each other with a relatively short distance therebetween, the second rf signal received by the second antenna 106 may be mixed with an interference signal generated by a part of the first rf signal transmitted by the first antenna 105. In this regard, the radio frequency interference suppression system provided in the embodiment of the present invention can cancel the interference signal mixed in the second radio frequency signal received by the second antenna 106. The following is a detailed description.
The transmitting module 101 is configured to divide a first radio frequency signal in a radio frequency transmitting channel of the co-located platform device into two paths, one path is directly output to the first antenna 105, so that the first antenna 105 transmits the first radio frequency signal, and the other path is coupled with a part of the first radio frequency signal through the transmitting module 101 to obtain a coupled radio frequency signal.
The radio frequency cancellation signal generating module 102 is configured to obtain a coupled radio frequency signal from the transmitting module 101, take the obtained signal as a reference signal, and perform delay, attenuation and phase shift processing on the reference signal to generate a radio frequency cancellation signal.
The receiving module 103 is configured to obtain a second radio frequency signal and a radio frequency cancellation signal received by the second antenna, and cancel an interference signal in the second radio frequency signal by using the radio frequency cancellation signal to obtain a first signal. The receiving module 103 is further configured to output the first signal to a radio frequency receiving channel 108 of the co-located platform equipment. The first signal is the received signal after the interference signal is cancelled. The second rf signal is transmitted by an antenna other than the first antenna (e.g., a third antenna), and the interference signal is generated by a portion of the first rf signal received by the second antenna.
The control processing module 104 is configured to extract a portion of the first signal from the receiving module, and determine a control weight of the radio frequency cancellation signal generating module 102 based on the extracted signal. The control weights are determined by parameters of the interference cancellation system, which may include: bandwidth of the signal, operating frequency, amount of delay, amplitude attenuation value, amount of delay of the wireless interference channel, etc. The delay amount of the wireless interference channel refers to the delay amount of the wireless channel between the first antenna and the second antenna, and the delay amount is obtained by measurement at the beginning of system design.
The control processing module 104 controls the amplitude and the phase of the reference signal based on the control weight, so that the radio frequency cancellation signal generated by the radio frequency cancellation signal generating module can cancel the interference signal in the second radio frequency signal.
Specific structures of the transmitting module 101, the radio frequency cancellation signal generating module 102, and the receiving module 103 are described in detail below.
In one embodiment, the transmitting module 101 includes: a first coupler C1 and a transmit power amplifier A1; the input end of the transmitting power amplifier A1 is used for acquiring a first radio frequency signal transmitted by the radio frequency transmitting channel 107 of the co-located platform equipment, and the output end of the transmitting power amplifier A1 is used for outputting the first radio frequency signal after power amplification. The first coupler C1 includes an input end, a through output end and a coupling output end, the input end of the first coupler C1 is used for obtaining a first radio frequency signal output by the transmit power amplifier A1, the through output end of the first coupler C1 is used for outputting the first radio frequency signal obtained by the input end to the first antenna, and the coupling output end of the first coupler C1 is used for coupling a part of the first radio frequency signal obtained by the input end to the radio frequency cancellation signal generating module 102.
In one embodiment, the receiving module 103 includes: a second coupler C2, a low noise amplifier A2, and a third coupler C3; the second coupler C2 comprises a direct input end, a coupling input end and an output end, the direct input end of the second coupler C2 is used for acquiring a second radio frequency signal, the coupling input end of the second coupler C2 is used for acquiring a radio frequency cancellation signal, the second coupler C2 is used for canceling an interference signal in the second radio frequency signal by using the radio frequency cancellation signal to obtain a first signal, and the output end of the second coupler C2 is used for outputting the first signal; the low noise amplifier A2 is used for acquiring a first signal and amplifying the first signal; the third coupler C3 includes an input end, a through output end and a coupling output end, the input end of the third coupler C3 is used for obtaining the first signal output by the low noise amplifier A2, the through output end of the third coupler C3 is used for outputting the first signal to the radio frequency receiving channel 108 of the co-location platform equipment, and the coupling output end of the third coupler C3 is used for extracting part of the first signal output by the low noise amplifier A2 to the control processing module 104.
In this embodiment, the coupling degrees of the first coupler C1, the second coupler C2 and the third coupler C3 are controllable, and the coupling degrees can be determined according to the signal intensity of the signal wirelessly radiated to the second antenna, and the coupling degree is generally selected to be greater than 10dB; wherein, when the transmitted signal power is of primary concern, the coupling degree of the first coupler C1 should be greater than that of the second coupler C2; when the G/T (G represents the gain of the entire receiving link, and T represents the equivalent noise temperature of the entire receiving link) value of the receiving module 103 is concerned first, the coupling degree of the first coupler C1 should be smaller than that of the second coupler C2.
In one embodiment, the radio frequency cancellation signal generation module includes: a multi-tap radio frequency cancellation circuit; referring to fig. 2, the multi-tap radio frequency cancellation circuit includes a plurality of channels, an input end of the multi-tap radio frequency cancellation circuit is used for obtaining a reference signal P1, each channel is used for outputting a path of sub-radio frequency cancellation signal, the sub-radio frequency cancellation signals are synthesized to obtain a radio frequency cancellation signal P2, and each channel includes a delay device, an attenuator and a phase shifter; the input end of the delay device is used for obtaining the reference signal, the output end of the delay device is connected with the input end of the attenuator, the output end of the attenuator is connected with the input end of the phase shifter, and the output end of the phase shifter is used for outputting the sub-radio frequency cancellation signal of the corresponding channel. In fig. 2, the delays 1 and 2 and … …, n, respectively, represent delays corresponding to n channels, the attenuators 1 and 2 and … …, n, respectively, represent attenuators corresponding to n channels, and the phase shifters 1 and 2 and … …, n, respectively, represent phase shifters corresponding to n channels.
The number of channels and the time delay amount of each channel in the radio frequency cancellation signal generation module 103 are used as optimization variables, the number of channels is firstly designated, then a group of corresponding time delay amounts are obtained through optimization, and then the optimal weight corresponding to the group of time delay amounts is calculated; when the designated channel number is changed, the obtained delay amount and the optimal weight are correspondingly changed, and the final interference suppression effect is also changed; generally, the larger the number of channels, the better the interference suppression effect, but the more complex the corresponding multi-tap radio frequency cancellation circuit, and the interference suppression requirement and the circuit complexity compromise need to be combined for consideration during design.
In this embodiment, configuring the reference signal by the radio cancellation signal generating module based on the control weight includes: adopting a preset genetic algorithm, taking the minimum power of a first signal as a target, taking the number of channels in a radio frequency cancellation signal generation module and the time delay amount of each channel as optimization variables, and calculating the control weight of the amplitude and the phase of each channel of the radio frequency cancellation signal generation module according to the following formula after the optimization is completed:
W opt =R -1 Q；
wherein ,W opt representing an optimal control weight;
Ra first matrix of parameters is represented,
，/>
；
q represents a second parameter matrix and,
，/>
；
Brepresenting bandwidth, sin, of radio frequency signalc() The function of the sine is represented by a sine function,a m represents the signal amplitude attenuation value of the mth wireless channel obtained by the preliminary measurement,t i represent the firstiThe amount of time delay of the stripe channel,t j represent the firstjThe amount of time delay of the stripe channel,
representing the amount of delay of the mth wireless channel obtained by the preliminary measurement,t n represent the firstnThe amount of time delay of the stripe channel;f 0 representing the center operating frequency; n represents the number of multi-tap interference cancellation channels and m represents the number of wireless channels.
In the control processing module 104, parameters of the wireless channel, such as signal amplitude attenuation and signal amplitude attenuation, are obtained by pre-measurementa m And delay amount
The method comprises the steps of carrying out a first treatment on the surface of the Then, setting the channel number in the multi-tap radio frequency cancellation circuit; calculating the time delay amount of a group of each channel based on a preset genetic algorithm; finally, calculating the optimal control weight according to the optimized time delayW opt Control weightW opt Representing the amplitude weight and the phase weight of each channel; obtaining the optimal control weightW opt And then, the optimal control weight is configured in each channel of the multi-tap radio frequency cancellation circuit, so that the reference signal is processed to generate a radio frequency cancellation signal, and the radio frequency cancellation signal and the interference signal in the receiving module 103 are cancelled.
The following describes the principle of optimizing the delay amount corresponding to each channel in the multi-tap radio frequency cancellation circuit.
By optimally controlling weightsW opt The expression of (2) shows that the optimal weight valueW opt From the following componentsRMatrix and method for forming sameQMatrix determination, i.e. by letterNumber bandwidthBCenter frequency of operationf 0 Delay amount of each channelt i Delay amount of wireless interference channel
And amplitude decay valuea m And (5) determining. In the working scene of the co-location platform, the signal bandwidthBOperating frequencyf 0 Delay amount of wireless interference channel>
And amplitude decay valuea m Can be regarded as fixed, so that the amount of delay of each channel is left controllablet i . And, there is at least one set of multi-tap delay combinations such that post-cancellation residual signal power is minimized. Therefore, the core idea of the embodiment of the invention is to find the optimal delay amount of each channelt i 。/>
The power of the first signal remaining after cancellation is:
deriving the minimum value point, namely:
the optimal control weight can be expressed as:
W opt =R -1 Q；
wherein ,P r which represents the power of the first signal,P 1 representing the power of the first radio frequency signal,H r representing the frequency response of the first signal,H c representing the frequency response of the radio interference channel,Xthe phase rotation factor vector is represented as such,Wthe control weight vector is represented by a vector of control weights,W H represents the conjugate transpose of W,findicating the operating frequency.
To sum up, in the embodiment of the present invention, in the working scenario of the co-located platform, the weight is optimally controlledW opt From the signal bandwidthBOperating frequencyf 0 Delay amount of each channelt i Delay amount of wireless interference channel
And amplitude decay valuea m Determining; while the signal bandwidthBCenter frequency of operationf 0 Delay amount of wireless interference channel>
And amplitude decay valuea m Is fixed, so that the delay of each channel is left controllablet i The embodiment of the invention adopts a preset genetic algorithm to cancel the power of the first signalP r Minimum as objective function, delay of each channelt i And in order to optimize variables, obtaining optimal control weights of amplitude and phase in the multi-tap radio frequency cancellation circuit, and then configuring the obtained control weights to the multi-tap radio frequency cancellation circuit.
Referring to fig. 3, fig. 3 shows an interference cancellation performance schematic diagram of a co-located platform equipped radio frequency interference suppression system according to an embodiment of the present invention, and it can be seen that when the number of taps (the number of channels) of a multi-tap radio frequency cancellation circuit is selected to be 6, the performance of the multi-tap radio frequency cancellation circuit is close to that of the 8 taps of the existing method, and when the 7 taps are adopted, the method provided by the embodiment of the present invention is far superior to the existing method. In summary, the radio frequency interference suppression system of the co-located platform equipment provided by the embodiment of the invention reduces the cost of the circuit and the control error introduced by the circuit under the condition of not increasing the tap number of the multi-tap radio frequency cancellation circuit; meanwhile, as the number of taps is reduced, the operation amount of the control processing module is reduced, and the performance requirement on the control processing module is also reduced.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (7)
1. A radio frequency interference suppression system of co-located platform equipment, the co-located platform equipment comprising more than two antennas, wherein a first antenna and a second antenna are disposed adjacent, the radio frequency interference suppression system comprising:
the transmitting module is used for outputting a first radio frequency signal in a radio frequency transmitting channel of the co-located platform equipment to a first antenna so that the first antenna transmits the first radio frequency signal; the transmitting module is further used for coupling part of the first radio frequency signals from the radio frequency transmitting channels of the co-located platform equipment to obtain coupled radio frequency signals;
the radio frequency cancellation signal generation module is used for acquiring the coupling radio frequency signal from the transmitting module, taking the acquired signal as a reference signal, and generating a radio frequency cancellation signal after time delay, attenuation and phase shift processing of the reference signal;
the receiving module is used for acquiring a second radio frequency signal and the radio frequency cancellation signal received by the second antenna, wherein the second radio frequency signal is transmitted by other antennas except the first antenna, the second radio frequency signal comprises an interference signal, and the interference signal is generated by part of the first radio frequency signal received by the second antenna; the receiving module is further configured to cancel an interference signal in the second radio frequency signal by using the radio frequency cancellation signal to obtain a first signal; the receiving module is further configured to output the first signal to a radio frequency receiving channel of the co-located platform device;
the control processing module is used for extracting part of the first signals from the receiving module and determining the control weight of the radio frequency cancellation signal generating module based on the extracted signals; the control processing module is further used for controlling the amplitude and the phase of the reference signal based on the control weight, so that the radio frequency cancellation signal generated by the radio frequency cancellation signal generating module can cancel the interference signal in the second radio frequency signal.
2. The co-located platform equipped radio frequency interference suppression system of claim 1, wherein the transmit module comprises: a first coupler and a transmit power amplifier;
the input end of the transmitting power amplifier is used for acquiring a first radio frequency signal transmitted by a radio frequency transmitting channel of the co-located platform equipment, and the output end of the transmitting power amplifier is used for outputting the first radio frequency signal after power amplification;
the first coupler comprises an input end, a through output end and a coupling output end, wherein the input end of the first coupler is used for acquiring a first radio frequency signal output by the transmitting power amplifier, the through output end of the first coupler is used for outputting the first radio frequency signal acquired by the input end to the first antenna, and the coupling output end of the first coupler is used for coupling a first radio frequency signal acquired by part of the input ends to a radio frequency cancellation signal generation module.
3. The radio frequency interference suppression system of co-located platform equipment of claim 2, wherein the receiving module comprises: a second coupler, a low noise amplifier, and a third coupler;
the second coupler comprises a direct input end, a coupling input end and an output end, wherein the direct input end of the second coupler is used for acquiring the second radio frequency signal, the coupling input end of the second coupler is used for acquiring the radio frequency cancellation signal, the second coupler is used for canceling an interference signal in the received signal by using the radio frequency cancellation signal to obtain a first signal, and the output end of the second coupler is used for outputting the first signal;
the low noise amplifier is used for acquiring the first signal and amplifying the first signal;
the third coupler comprises an input end, a through output end and a coupling output end, wherein the input end of the third coupler is used for acquiring a first signal output by the low-noise amplifier, the through output end of the third coupler is used for outputting the first signal to a radio frequency receiving channel of the co-located platform equipment, and the coupling output end of the third coupler is used for coupling part of the first signal output by the low-noise amplifier to the control processing module.
4. The radio frequency interference suppression system of co-located platform equipment of claim 3, wherein the first coupler, the second coupler, and the third coupler each have a coupling degree of greater than 10dB.
5. The radio frequency interference suppression system of co-located platform equipment of claim 1, wherein the radio frequency cancellation signal generation module comprises: a multi-tap radio frequency cancellation circuit;
the multi-tap radio frequency cancellation circuit comprises a plurality of channels, each channel is used for outputting a path of sub-radio frequency cancellation signal, and the sub-radio frequency cancellation signals are synthesized to obtain the radio frequency cancellation signal.
6. The co-located platform equipped radio frequency interference suppression system of claim 5, wherein each channel in the multi-tap radio frequency cancellation circuit comprises a delay, an attenuator, and a phase shifter;
the input end of the delay device is used for acquiring the reference signal, the output end of the delay device is connected with the input end of the attenuator, the output end of the attenuator is connected with the input end of the phase shifter, and the output end of the phase shifter is used for outputting the sub-radio frequency cancellation signal of the corresponding channel.
7. The system for radio frequency interference suppression of co-located platform equipment according to claim 5, wherein said controlling the amplitude and phase of the reference signal by the radio frequency cancellation signal generation module based on the control weights comprises:
adopting a preset genetic algorithm, taking the minimum power of the first signal as a target, optimizing the number of channels in the radio frequency cancellation signal generation module and the time delay amount of each channel as optimization variables, and calculating the control weight of the amplitude and the phase of each channel of the radio frequency cancellation signal generation module according to the following formula after the optimization is completed:
W opt =R -1 Q，
wherein ,W opt representing the optimal control weight;
Ra first matrix of parameters is represented,
，/>
；
q represents a second parameter matrix and,
，/>
；
Brepresenting bandwidth, sin, of radio frequency signalc() The function of the sine is represented by a sine function,a m represents the signal amplitude attenuation value of the mth wireless channel obtained by the preliminary measurement,t i represent the firstiThe amount of time delay of the stripe channel,t j represent the firstjThe amount of time delay of the stripe channel,
representing the amount of delay of the mth wireless channel obtained by the preliminary measurement,t n represent the firstnThe amount of time delay of the stripe channel;f 0 representing the center operating frequency; n represents the mid-pass of multi-tap radio frequency cancellation circuitThe number of lanes, m, represents the number of radio channels. />
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