CN114499558A - Same frequency interference cancellation device - Google Patents
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Abstract
The application provides a same-frequency interference cancellation device, which comprises a plurality of antenna devices and an anti-phase cancellation circuit, wherein the antenna devices are used for receiving a plurality of preset signals, each preset signal comprises a communication signal and an interference signal, and the communication signal and the interference signal are in the same preset frequency band; the reverse phase cancellation circuit is electrically connected with the plurality of antenna devices and is used for receiving a plurality of predetermined signals sent by the plurality of antenna devices and performing predetermined processing on the plurality of predetermined signals to obtain a plurality of target signals, wherein the sum of the amplitudes of interference signals in the plurality of target signals is smaller than the sum of the amplitudes of interference signals in the plurality of predetermined signals, namely, the interference signals in the plurality of predetermined signals are cancelled by a hardware circuit, the anti-interference capability of the wireless network device is ensured to be strong, the wireless network device can output at a high speed under the condition that the external environment has co-frequency interference, and therefore the problem that the co-frequency interference is difficult to solve based on pure hardware in the prior art is solved.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a co-channel interference cancellation apparatus.
Background
At present, a home environment generally adopts WIFI (Wireless-Fidelity) to perform Wireless network coverage, and since a WIFI 2.4G frequency band is an ism (industrial Scientific medical) frequency band, and various Wireless signals exist in the frequency band, the WIFI 2.4G frequency band is the frequency band with the most serious interference, so that the internet experience of a user is poor.
In the prior art, some mature mechanisms are already used for solving co-Channel interference, for example, Frequency hopping technology, dfs (dynamic Frequency selection), CCA (Clear Channel Assessment) and other technologies, and other protocol-level-based optimization measures, that is, methods for solving co-Channel interference mostly stay in a software level, so as to optimize co-Channel interference risk in a WIFI network. However, due to inherent defects of the WIFI network, a solution based on a software layer does not really solve the problem of co-channel interference.
The inventor has known that there are few methods for solving co-channel interference directly from hardware level in the existing solutions, and although the invention patent CN104170340B discloses a method for canceling co-channel interference, which can solve the problem of co-channel interference from hardware level, there still exist some problems, for example, the cancellation signal depends on the reference signal and the cancellation signal and the reference signal do not arrive at the cancellation point at the same time.
In view of the above problems, it is desirable to provide a device capable of solving the co-channel interference problem based on pure hardware.
The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, certain information may be included in the background that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
The main purpose of the present application is to provide a co-channel interference cancellation apparatus to solve the problem in the prior art that it is difficult to solve co-channel interference based on pure hardware.
According to an aspect of the present application, there is provided an apparatus for canceling co-channel interference, including: a plurality of antenna devices for receiving a plurality of predetermined signals, each of the predetermined signals including a communication signal and an interference signal, the communication signal and the interference signal being within a same predetermined frequency band; and the reverse phase cancellation circuit is electrically connected with the plurality of antenna devices and is used for receiving the plurality of preset signals sent by the plurality of antenna devices and performing preset processing on the plurality of preset signals to obtain a plurality of target signals, wherein the target signals correspond to the preset signals in a one-to-one manner, and the sum of the amplitudes of the interference signals in the plurality of target signals is smaller than the sum of the amplitudes of the interference signals in the plurality of preset signals.
Optionally, the anti-phase cancellation circuit comprises: the anti-phase cancellation branch comprises a time delayer, one end of the time delayer is electrically connected with the antenna equipment, and the time delayer is used for receiving a preset signal sent by the antenna equipment and adjusting the transmission delay of the received preset signal; a combiner, a first end of which is electrically connected to the delay unit and a second end of which is electrically connected to the antenna device, the combiner being configured to receive a plurality of the predetermined signals and superimpose the plurality of the predetermined signals, so that a sum of amplitudes of the interference signals in the obtained plurality of target signals is smaller than a sum of amplitudes of the interference signals in the plurality of the predetermined signals.
Optionally, the antenna device is electrically connected to the anti-phase cancellation branches in a one-to-one correspondence.
Optionally, the anti-phase cancellation branch further comprises: one end of the digital phase shifter is electrically connected with the antenna equipment, and the digital phase shifter is used for receiving the predetermined signal sent by the antenna equipment and adjusting the phase value of the predetermined signal, so that the predetermined signal after the phase value is adjusted is opposite to the phase values of other predetermined signals; and one end of the step attenuator is electrically connected with the digital phase shifter, the other end of the step attenuator is electrically connected with the time delay unit, and the step attenuator is used for receiving the preset signal after the phase value is adjusted and adjusting the amplitude of the preset signal after the phase value is adjusted so as to enable the amplitude of the preset signal after the amplitude is adjusted to be equal to the amplitudes of other preset signals.
Optionally, the apparatus further comprises: and the transceiver is electrically connected with the multiple anti-phase cancellation circuits and used for receiving the multiple target signals sent by the multiple anti-phase cancellation circuits and demodulating the received multiple target signals to obtain multiple target information.
Optionally, the apparatus further comprises: and one end of the preprocessing circuit is electrically connected with the antenna equipment, and the other end of the preprocessing circuit is electrically connected with the reverse phase cancellation circuit and is used for receiving a plurality of preset signals sent by the antenna equipment, preprocessing the received preset signals to obtain a plurality of processed preset signals, and sending the processed preset signals to the reverse phase cancellation circuit.
Optionally, the preprocessing circuit comprises: one end of the filter is electrically connected with the antenna equipment and is used for receiving the preset signal sent by the antenna equipment and filtering the preset signal so as to filter the preset signal outside the preset frequency band; one end of the amplifier is electrically connected with the filter and is used for receiving the filtered preset signal sent by the filter and amplifying the filtered preset signal to obtain the amplified preset signal.
Optionally, the preprocessing circuit further comprises: and one end of the power divider is electrically connected with the amplifier, the other end of the power divider is electrically connected with the inverting cancellation circuit, and the power divider is used for receiving the amplified preset signal and switching between an MIMO communication mechanism and a same-frequency suppression mechanism according to the amplified preset signal.
Optionally, the number of the preprocessing circuits is the same as that of the inverse phase cancelling circuits, and the preprocessing circuits are electrically connected with the inverse phase cancelling circuits in a one-to-one correspondence manner.
Optionally, the predetermined frequency band is 2.4 GHz.
By applying the technical scheme of the application, the same-frequency interference cancellation device comprises a plurality of antenna devices and an anti-phase cancellation circuit, wherein the antenna devices are used for receiving a plurality of predetermined signals, the antenna devices send the received predetermined signals to the anti-phase cancellation circuit, the anti-phase cancellation circuit is used for receiving the predetermined signals sent by the antenna devices and performing predetermined processing on the received predetermined signals to obtain a plurality of target signals, the target signals correspond to the predetermined signals one to one, and the sum of the amplitudes of the interference signals in the target signals is smaller than the sum of the amplitudes of the interference signals in the predetermined signals. The anti-phase cancellation circuit can perform predetermined processing on the received multiple predetermined signals, so that after the multiple predetermined signals pass through the anti-phase cancellation circuit, the sum of the amplitudes of the interference signals in the multiple target signals is smaller than the sum of the amplitudes of the interference signals in the multiple predetermined signals, that is, the interference signals in the multiple predetermined signals are mutually cancelled through the hardware circuit, the anti-interference capability of the wireless network equipment is ensured to be strong, the wireless network equipment can output at high speed under the condition that the external has same frequency interference, and the user internet experience is ensured to be good, thereby solving the problem that the same frequency interference is difficult to solve based on pure hardware in the prior art.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 shows a schematic connection diagram of an on-channel cancellation arrangement according to an embodiment of the present application;
FIG. 2 shows a schematic connection diagram of an on-channel cancellation arrangement according to a specific embodiment of the present application;
FIG. 3 shows a schematic connection diagram of an on-channel cancellation arrangement according to yet another embodiment of the present application;
FIG. 4 shows a schematic connection diagram of an on-channel cancellation arrangement according to another embodiment of the present application;
FIG. 5 shows a schematic connection diagram of an on-channel cancellation arrangement according to yet another specific embodiment of the present application;
FIG. 6 shows a flow diagram according to an embodiment of the present application.
Wherein the figures include the following reference numerals:
100. an antenna device; 101. a digital phase shifter; 102. a step attenuator; 103. a time delay; 104. a combiner; 105. an anti-phase cancellation circuit; 106. a transceiver; 107. a pre-processing circuit; 108. a reverse phase cancellation branch; 109. a filter; 110. an amplifier; 111. a power divider.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As described in the background art, it is difficult to solve the co-channel interference problem based on pure hardware in the prior art, and in order to solve the above problem, the present application provides a co-channel interference cancellation apparatus.
In an exemplary embodiment of the present application, a co-channel interference cancellation apparatus is provided, where the cancellation apparatus includes a plurality of antenna devices and an anti-phase cancellation circuit, where the antenna devices are configured to receive a plurality of predetermined signals, each of the predetermined signals includes a communication signal and an interference signal, and the communication signal and the interference signal are in a same predetermined frequency band; the inverse phase cancellation circuit is electrically connected to the plurality of antenna devices, and configured to receive a plurality of predetermined signals sent by the plurality of antenna devices, and perform predetermined processing on the plurality of predetermined signals to obtain a plurality of target signals, where the target signals correspond to the predetermined signals one to one, and a sum of amplitudes of the interference signals in the plurality of target signals is smaller than a sum of amplitudes of the interference signals in the plurality of predetermined signals.
As shown in fig. 1, the same-frequency interference cancellation apparatus includes a plurality of antenna devices 100 and an inverse cancellation circuit 105, where the antenna devices 100 are configured to receive a plurality of predetermined signals, the antenna devices 100 transmit the received plurality of predetermined signals to the inverse cancellation circuit 105, the inverse cancellation circuit 105 is configured to receive the plurality of predetermined signals transmitted by the antenna devices 100 and perform predetermined processing on the received plurality of predetermined signals to obtain a plurality of target signals, the target signals are in one-to-one correspondence with the predetermined signals, and a sum of amplitudes of the interference signals in the plurality of target signals is smaller than a sum of amplitudes of the interference signals in the plurality of predetermined signals. The anti-phase cancellation circuit can perform predetermined processing on the received multiple predetermined signals, so that after the multiple predetermined signals pass through the anti-phase cancellation circuit, the sum of the amplitudes of the interference signals in the multiple target signals is smaller than the sum of the amplitudes of the interference signals in the multiple predetermined signals, that is, the interference signals in the multiple predetermined signals are mutually cancelled through the hardware circuit, the anti-interference capability of the wireless network equipment is ensured to be strong, the wireless network equipment can output at high speed under the condition that the external environment has co-frequency interference, and the user internet experience is ensured to be good, thereby solving the problem that the co-frequency interference is difficult to solve based on pure hardware in the prior art.
Specifically, the antenna device may be a vertically polarized antenna device, and may also be a horizontally polarized antenna device, and of course, in this application, the antenna device is not limited to the above two antenna devices, and may also be other types of antenna devices.
In this embodiment, the sum of the amplitudes of the interference signals in the obtained plurality of target signals is smaller than the sum of the amplitudes of the interference signals in the plurality of predetermined signals, that is, after the plurality of predetermined signals pass through the phase inversion cancellation circuit, the strength of the interference signals in the obtained plurality of target signals with respect to the interference signals in the plurality of predetermined signals transmitted by the plurality of antenna devices is weakened.
In an embodiment of the present application, as shown in fig. 1, the reverse phase cancellation circuit 105 includes at least one reverse phase cancellation branch 108 and a combiner 104, where the reverse phase cancellation branch includes a time delay unit 103, one end of the time delay unit 103 is electrically connected to the antenna device 100, and the time delay unit 103 is configured to receive a predetermined signal sent by the antenna device 100 and adjust a transmission delay of the received predetermined signal; the combiner 104 has a first end electrically connected to the delay unit 103 and a second end electrically connected to the antenna device 100, and the combiner 104 is configured to receive a plurality of the predetermined signals and superimpose the plurality of the predetermined signals so that a sum of amplitudes of the interference signals in the obtained plurality of target signals is smaller than a sum of amplitudes of the interference signals in the plurality of the predetermined signals. In the reverse phase cancellation circuit, the delayer may adjust transmission delays of predetermined signals passing through the reverse phase cancellation branch, so that the time of the predetermined signals finally reaching the combiner is the same, thereby avoiding the problem of different times of cancellation of interference signals due to different transmission delays, and the combiner may superimpose a plurality of received predetermined signals, so that the sum of amplitudes of the interference signals in the obtained plurality of target signals is smaller than the sum of amplitudes of the interference signals in the plurality of predetermined signals, that is, mutual cancellation of the plurality of interference signals in the plurality of predetermined signals is achieved, thereby further ensuring a better network rate and further ensuring a better user experience.
In a specific embodiment of the present application, as shown in fig. 1, the antenna device 100 is electrically connected to the anti-phase cancellation branches 108 in a one-to-one correspondence manner, and of course, the antenna device 100 may also be electrically connected to the combiners 104 in a one-to-one correspondence manner.
In an actual application process, the number of the anti-phase cancellation branches in the anti-phase cancellation circuit can be adjusted according to actual requirements. For example, two predetermined signals sent to the anti-phase cancellation circuit can be adjusted by adjusting the phase value and amplitude of one of the predetermined signals to be opposite to the phase value of the other predetermined signal and to be equal in amplitude, in which case only one anti-phase cancellation branch needs to be provided; alternatively, two predetermined signals are adjusted in phase value and amplitude value so that the two predetermined signals respectively reach their set target phase value and target amplitude value, and the phase value of the two target phase values is opposite and the two target amplitude values are equal, in which case two anti-phase cancellation branches may be provided.
In order to ensure that the phase values of the predetermined signals arriving at the combiner are opposite and equal in amplitude, and further ensure that the sum of the amplitudes of the interference signals in the plurality of target signals obtained after superposition by the combiner is smaller than the sum of the amplitudes of the interference signals in the plurality of predetermined signals, in another embodiment of the present application, as shown in fig. 1, the inverse cancellation branch 108 further includes a digital phase shifter 101 and a step attenuator 102, wherein one end of the digital phase shifter 101 is electrically connected to the antenna apparatus 100, and the digital phase shifter 101 is configured to receive the predetermined signals transmitted by the antenna apparatus 100 and adjust the phase values of the predetermined signals so that the predetermined signals after adjusting the phase values are opposite to the phase values of the other predetermined signals; one end of the step attenuator 102 is electrically connected to the digital phase shifter 101, and the other end is electrically connected to the delay unit 103, and the step attenuator 102 is configured to receive the predetermined signal after adjusting the phase value and adjust the amplitude of the predetermined signal after adjusting the phase value, so that the amplitude of the predetermined signal after adjusting the amplitude is equal to the amplitudes of the other predetermined signals.
Specifically, as shown in fig. 1, two antenna devices 100 transmit two predetermined signals to an anti-phase cancellation circuit 105, wherein one predetermined signal enters an anti-phase cancellation branch 108, the other predetermined signal directly enters a combiner 104, for the predetermined signal entering the anti-phase cancellation branch 108, first, the digital phase shifter 101 enters a digital phase shifter 101, the digital phase shifter 101 adjusts the phase value of the received predetermined signal, so that the predetermined signal with the adjusted phase value and the predetermined signal with the unadjusted phase value (i.e. directly entering the combiner 104) have a phase difference of 180 degrees, then the digital phase shifter 101 transmits the predetermined signal with the adjusted phase value to a step attenuator 102, the step attenuator 102 adjusts the amplitude value of the predetermined signal with the adjusted phase value, so that the predetermined signal with the adjusted amplitude value and the predetermined signal with the unadjusted amplitude value (i.e. directly entering the combiner 104) have the same amplitude value, finally, the step attenuator 102 sends the predetermined signal with the adjusted amplitude to the delayer 103, so that the delayer 103 can adjust the transmission delay of the predetermined signal with the adjusted amplitude, so that the time for the two predetermined signals to reach the combiner 104 is the same, the combiner 104 superimposes the two received predetermined signals to obtain a plurality of target signals, the target signals correspond to the predetermined signals one to one, the sum of the amplitudes of the interference signals in the plurality of target signals is smaller than the sum of the amplitudes of the interference signals in the plurality of predetermined signals, further ensuring that the signal strength of the interference signals in the plurality of obtained target signals is weak, and further ensuring that the network rate is good.
Specifically, as for the connection relationship between the digital phase shifter 101 and the step attenuator 102 in the above-mentioned inverting cancellation branch 108, it is not limited to the connection relationship shown in fig. 1, and in a specific embodiment, the antenna apparatus 100 may be electrically connected to the step attenuator 102, and then the digital phase shifter 101 may be electrically connected to a position behind the step attenuator 102. Of course, as shown in fig. 1, the digital phase shifter 101 is electrically connected to the antenna apparatus 100, and the step attenuator 102 is electrically connected to the digital phase shifter 101, so that the phase difference of the predetermined signals can be ensured to be consistent, and the performance of the phase-reversal cancellation circuit can be ensured to be good.
Certainly, in the practical application process, if the two predetermined signals sent to the phase-reversal cancellation circuit are equal in amplitude, the phase-reversal cancellation branch can be only provided with a digital phase shifter without adjusting the amplitude again; if the phase values of the two predetermined signals are opposite and the phase value is not required to be adjusted, the inverting and canceling branch can be only provided with a step attenuator; in the case that two predetermined signals can reach the combiner at the same time, the anti-phase cancellation branch may not be provided with a delay device. That is, the digital phase shifter, the step attenuator and the time delay device disposed in the specific anti-phase cancellation branch can be adjusted according to the actual situation.
In another specific embodiment of the present application, as shown in fig. 2, the inverse cancellation circuit 105 may further include two inverse cancellation branches 108, wherein one end of each of the two inverse cancellation branches 108 is electrically connected to the antenna device 100, and the other end is electrically connected to the combiner 104, so as to further ensure that the phase values of the predetermined signals input to the combiner are opposite and the amplitudes of the predetermined signals are equal, further ensure that the cancellation effect on the interference signals is better, further ensure that the sum of the amplitudes of the interference signals in the obtained target signal is smaller, and further ensure that the internet experience of the user is better.
Of course, in an actual application process, as shown in fig. 2, after receiving two predetermined signals, the anti-phase cancellation circuit inputs the two predetermined signals into corresponding anti-phase cancellation branches, respectively, so as to adjust phase values, amplitudes, and transmission delays of the two predetermined signals, so that the same frequency interference cancellation device of the present application can be applied to more complex scenes, and the anti-phase cancellation parameters can be converged more quickly.
In another specific embodiment of the present application, the digital phase shifter may be a high-precision digital phase shifter. Of course, the phase shifter is not limited to a digital phase shifter, and may also be an analog phase shifter, that is, in this scheme, only the phase value of the predetermined signal needs to be adjusted.
In another embodiment of the present application, as shown in fig. 3, the inverse phase cancellation apparatus further includes a transceiver 106, where the transceiver 106 is electrically connected to the multiple inverse phase cancellation circuits 105, and is configured to receive multiple target signals sent by the multiple inverse phase cancellation circuits 105, and demodulate the received multiple target signals to obtain multiple target information, that is, communication content actually carried in the target signals.
In yet another embodiment of the present application, as shown in fig. 4, the reverse phase cancellation apparatus further includes at least one preprocessing circuit 107, one end of the preprocessing circuit 107 is electrically connected to the antenna device 100, and the other end of the preprocessing circuit 107 is electrically connected to the reverse phase cancellation circuit 105, where the preprocessing circuit 107 is configured to receive a plurality of the predetermined signals sent by the antenna device 100, preprocess the received plurality of the predetermined signals to obtain a plurality of processed predetermined signals, and send the plurality of processed predetermined signals to the reverse phase cancellation circuit 105. In the device, the preset signal is preprocessed before being sent to the anti-phase cancellation circuit, and the processed preset signal is sent to the anti-phase cancellation circuit, so that the better cancellation effect of the anti-phase cancellation circuit on the preset signal is further ensured.
It should be noted that, for the predetermined signal received by the anti-phase cancellation circuit, the anti-phase cancellation circuit performs predetermined processing on the predetermined signal, where the predetermined processing includes adjusting parameters such as a phase value, an amplitude value, or a transmission delay of the predetermined signal, and for the predetermined signal received by the preprocessing circuit, the preprocessing circuit performs preprocessing on the predetermined signal, where the preprocessing includes filtering, amplifying, and the like on the predetermined signal, that is, the predetermined processing and the preprocessing are not the same.
In an embodiment of the present application, as shown in fig. 4, the preprocessing circuit 107 includes a filter 109 and an amplifier 110, wherein one end of the filter 109 is electrically connected to the antenna device 100, and is configured to receive the predetermined signal sent by the antenna device 100 and filter the predetermined signal to filter the predetermined signal outside the predetermined frequency band; one end of the amplifier 110 is electrically connected to the filter 109, and is configured to receive the filtered predetermined signal transmitted by the filter 109, and amplify the filtered predetermined signal to obtain the amplified predetermined signal.
In an actual application process, the filter may be a band pass filter, a Surface Acoustic Wave filter (SAW filter for short), a Bulk Acoustic Wave filter (BAW filter for short), or a Low Temperature Cofired Ceramic filter (LTCC filter for short). The Amplifier may also be a Low Noise Amplifier (LNA).
Specifically, in an actual application process, the signal received by the antenna device may not be a predetermined signal in a predetermined frequency band, and the predetermined signal outside the predetermined frequency band may be filtered by the filter, so that it is further ensured that the interference signal in the same frequency band can be cancelled, and a better cancellation effect is further ensured. In addition, the filtered preset signal may have the problems of small signal and difficult cancellation, so that the device can amplify the filtered preset signal, and further ensure the good cancellation effect.
Of course, in the practical application process, only the filter or only the amplifier may be provided in the preprocessing circuit, and the specific requirements may be adjusted according to the practical situation. The specific connection mode of the preprocessing circuit is not limited to the connection mode described above, and can be adjusted according to actual conditions.
In order to ensure that the power consumption of the wireless network device is better, in another embodiment of the present application, as shown in fig. 4, the preprocessing circuit 107 further includes a power divider 111, one end of the power divider 111 is electrically connected to the amplifier 110, and the other end is electrically connected to the inverse phase cancellation circuit 105, where the power divider 111 is configured to receive the amplified predetermined signal, and switch between a MIMO (Multiple Input Multiple Output) communication mechanism and a same-frequency suppression mechanism according to the amplified predetermined signal.
Specifically, the Power Divider may be a Wilkinson Power Divider (Wilkinson Power Divider) or a Single Pole Double Throw (SPDT) Divider.
Of course, in the actual application process, the MIMO communication mechanism and the same-frequency suppression mechanism may also be simultaneously turned on.
In a specific embodiment of the present invention, as shown in fig. 5, the number of the preprocessing circuits 107 is the same as the number of the anti-phase canceling circuits 105, and the preprocessing circuits 107 and the anti-phase canceling circuits 105 are electrically connected in a one-to-one correspondence.
In another specific embodiment of the present application, the predetermined frequency band is 2.4 GHz.
In another specific embodiment of the present application, as shown in fig. 5, the same-frequency cancellation apparatus includes two antenna devices 100, namely, a first antenna device and a second antenna device, wherein the first antenna device is a vertically polarized antenna device, the second antenna device is a horizontally polarized antenna device, two preprocessing circuits 107, namely, a first preprocessing circuit and a second preprocessing circuit, two inverse cancellation circuits 105, namely, a first inverse cancellation circuit and a second inverse cancellation circuit, and one transceiver 106. In this embodiment, the first preprocessing circuit sends the received predetermined signal to the first inverting cancellation circuit and the second inverting cancellation circuit respectively, and the second preprocessing circuit sends the received predetermined signal to the first inverting cancellation circuit and the second inverting cancellation circuit respectively, that is, the same predetermined signal enters two different inverting cancellation circuits for cancellation, so that the MIMO communication technology can be compatible and the cancellation effect is further ensured to be good. In the MIMO communication state, a transceiver needs to process two signal streams simultaneously, and needs to use two RX links, and when there is interference in the MIMO communication state, two RX links need to be simultaneously interference-cancelled, so that the signal/interference ratio of the two RX links is maximized; under the condition of the non-working MIMO communication state, the two-path counteracting mode can be adopted to improve the effect of the antiphase counteracting, and because the convergence of two preset signals has difference in the actual parameter adjusting process, a relatively good point and a relatively poor point always exist in the two-path antiphase counteracting circuit, so that a target signal with better signal/interference can be selected.
In another specific embodiment of the present application, as shown in fig. 5, the same-frequency cancellation apparatus includes two antenna devices 100, where one antenna device 100 is a vertically polarized antenna device, the received predetermined signal R is S1+ C1, the other antenna device 100 is a horizontally polarized antenna device, the received predetermined signal R is S2+ C2, two preprocessing circuits 107, i.e., a first preprocessing circuit and a second preprocessing circuit, two inverse cancellation circuits 105, i.e., a first inverse cancellation circuit and a second inverse cancellation circuit, and one transceiver 106. Due to the difference in the ability of the antenna devices of both polarizations to receive spatial electromagnetic waves, S1 is not equal to S2, and C1 is not equal to C2 (here not equal to include amplitude and phase values). For a predetermined signal R received by the antenna device with vertical polarization, vertically equal to S1+ C1, the first preprocessing circuit is first entered for preprocessing, and the preprocessed predetermined signal R received with vertical equal to S1+ C1 is sent to the first anti-phase cancellation circuit, and for a predetermined signal R received by the antenna device with horizontal polarization, horizontally equal to S2+ C2, the second preprocessing circuit is first entered for preprocessing, and the preprocessed predetermined signal R received with horizontal equal to S2+ C2 is sent to the second anti-phase cancellation circuit. The first inverse cancellation circuit receives two predetermined signals sent by the first preprocessing circuit and the second preprocessing circuit respectively, the second inverse cancellation circuit receives two predetermined signals sent by the first preprocessing circuit and the second preprocessing circuit respectively, since S1 is not equal to S2 and C1 is not equal to C2, the amplitude of the interference signal C2 is adjusted by a step attenuator so that C1 is a × C2, a is an attenuation coefficient (which may also be an amplification coefficient), and the Phase difference of the interference signal C2 is adjusted by a digital Phase shifter so that Phase (C1) is 180 ± Phase (a × C2), and the time delay is adjusted so that the time delay for the predetermined signals (i.e. R vertical is S1+ C1, R horizontal is S2+ C2) to reach the combiner is the same, and finally the two predetermined signals are combined by the combiner to obtain the total received signal R (S1+ a + S1) + C73727), the total signal-to-interference ratio (communication signal/interference signal) is (S1+ a × S2)/(C1+ a × C2), since C1 and a × C2 are in equal amplitude phase inversion, C1+ a × C2 approaches 0, and since S1 and a × S2 do not satisfy phase inversion, S1+ a × S2 is a vector signal superposition and does not approach 0, but approaches the original signal S1 or a × S2. Since the denominator in the signal-to-interference ratio formula approaches 0 and the numerator approaches constant, the signal-to-interference ratio approaches infinity, that is, the effect of improving the signal-to-interference ratio is achieved, finally, the obtained two communication signals are sent to the transceiver 106, and the two target signals are demodulated through the transceiver 106 to obtain two target information.
In another specific embodiment of the present application, as shown in fig. 6, when the wireless network device is in a non-operating state (i.e., an idle state), the spectrum monitoring is performed, and the spectrum collected by the wireless network device in the non-operating state is analyzed to determine the occupation condition of the spectrum and whether there is co-channel interference. Under the condition that the occupancy rate of the frequency spectrum is high and the frequency spectrum is in same-frequency interference, the double-antenna equipment receives the preset signals of the selected channel, and according to the difference of interference signals in the preset signals received by the two antenna equipment, the phase values of the two preset signals are adjusted through the digital phase shifter and the amplitudes of the two preset signals are adjusted through the step attenuator, so that the interference signals received by the double-antenna equipment meet equal amplitude and opposite phase (the phase values are 180 DEG apart), the two preset signals are superposed to obtain a plurality of target signals, the sum of the amplitudes of the interference signals in the plurality of target signals is smaller than the sum of the amplitudes of the interference signals in the plurality of preset signals, and under the condition that the occupancy rate of the frequency spectrum is low or the frequency spectrum is not in same-frequency interference, the wireless network equipment continues to perform frequency spectrum detection. After the interference signals in the two predetermined signals are offset, whether the intensity of the same frequency interference is obviously reduced is tested, the judging standard can be that the output interference amplitude of the inverse offset circuit is attenuated by more than 6dB (but not limited to 6dB) compared with the originally detected interference amplitude, on the basis of meeting the interference suppression level, the parameters of the current digital phase shifter and the step attenuator are stored, then, a frequency spectrum with relatively low same frequency interference and relatively stable same frequency interference is selected as a frequency spectrum to be communicated, a communication request initiated by the terminal equipment is waited, on the basis of not meeting the interference suppression level, the interference information in the predetermined signals is continuously offset, and the predetermined signals obtained after offset meet the interference suppression level.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
the same-frequency interference cancellation device comprises a plurality of antenna devices and an anti-phase cancellation circuit, wherein the antenna devices are used for receiving a plurality of preset signals, the antenna devices send the received preset signals to the anti-phase cancellation circuit, the anti-phase cancellation circuit is used for receiving the preset signals sent by the antenna devices and performing preset processing on the received preset signals to obtain a plurality of target signals, the target signals correspond to the preset signals one to one, and the sum of the amplitudes of the interference signals in the target signals is smaller than the sum of the amplitudes of the interference signals in the preset signals. The anti-phase cancellation circuit can perform predetermined processing on the received multiple predetermined signals, so that after the multiple predetermined signals pass through the anti-phase cancellation circuit, the sum of the amplitudes of the interference signals in the multiple target signals is smaller than the sum of the amplitudes of the interference signals in the multiple predetermined signals, that is, the interference signals in the multiple predetermined signals are mutually cancelled through the hardware circuit, the anti-interference capability of the wireless network equipment is ensured to be strong, the wireless network equipment can output at high speed under the condition that the external environment has co-frequency interference, and the user internet experience is ensured to be good, thereby solving the problem that the co-frequency interference is difficult to solve based on pure hardware in the prior art.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An apparatus for canceling co-channel interference, comprising:
a plurality of antenna devices for receiving a plurality of predetermined signals, each of the predetermined signals including a communication signal and an interference signal, the communication signal and the interference signal being within a same predetermined frequency band;
and the reverse phase cancellation circuit is electrically connected with the plurality of antenna devices and is used for receiving the plurality of preset signals sent by the plurality of antenna devices and performing preset processing on the plurality of preset signals to obtain a plurality of target signals, wherein the target signals correspond to the preset signals in a one-to-one manner, and the sum of the amplitudes of the interference signals in the plurality of target signals is smaller than the sum of the amplitudes of the interference signals in the plurality of preset signals.
2. The apparatus of claim 1, wherein the anti-phase cancellation circuit comprises:
the anti-phase cancellation branch comprises a time delayer, one end of the time delayer is electrically connected with the antenna equipment, and the time delayer is used for receiving a preset signal sent by the antenna equipment and adjusting the transmission delay of the received preset signal;
a combiner, a first end of which is electrically connected to the delay unit and a second end of which is electrically connected to the antenna device, the combiner being configured to receive a plurality of the predetermined signals and superimpose the plurality of the predetermined signals, so that a sum of amplitudes of the interference signals in the obtained plurality of target signals is smaller than a sum of amplitudes of the interference signals in the plurality of the predetermined signals.
3. The apparatus of claim 2, wherein the antenna devices are electrically connected in one-to-one correspondence with the anti-phase cancellation branches.
4. The apparatus of claim 2, wherein the anti-phase cancellation branch further comprises:
one end of the digital phase shifter is electrically connected with the antenna equipment, and the digital phase shifter is used for receiving the predetermined signal sent by the antenna equipment and adjusting the phase value of the predetermined signal, so that the predetermined signal after the phase value is adjusted is opposite to the phase values of other predetermined signals;
and one end of the step attenuator is electrically connected with the digital phase shifter, the other end of the step attenuator is electrically connected with the time delay unit, and the step attenuator is used for receiving the predetermined signal after the phase value is adjusted and adjusting the amplitude of the predetermined signal after the phase value is adjusted, so that the amplitude of the predetermined signal after the amplitude is adjusted is equal to that of other predetermined signals.
5. The apparatus of claim 1, further comprising:
and the transceiver is electrically connected with the multiple anti-phase cancellation circuits and used for receiving the multiple target signals sent by the multiple anti-phase cancellation circuits and demodulating the received multiple target signals to obtain multiple target information.
6. The apparatus of claim 1, further comprising:
and one end of the preprocessing circuit is electrically connected with the antenna equipment, and the other end of the preprocessing circuit is electrically connected with the reverse phase cancellation circuit and is used for receiving a plurality of preset signals sent by the antenna equipment, preprocessing the received preset signals to obtain a plurality of processed preset signals, and sending the processed preset signals to the reverse phase cancellation circuit.
7. The apparatus of claim 6, wherein the pre-processing circuit comprises:
one end of the filter is electrically connected with the antenna equipment and is used for receiving the predetermined signal sent by the antenna equipment and filtering the predetermined signal so as to filter the predetermined signal outside the predetermined frequency band;
one end of the amplifier is electrically connected with the filter and is used for receiving the filtered preset signal sent by the filter and amplifying the filtered preset signal to obtain the amplified preset signal.
8. The apparatus of claim 7, wherein the pre-processing circuit further comprises:
and one end of the power divider is electrically connected with the amplifier, the other end of the power divider is electrically connected with the inverting cancellation circuit, and the power divider is used for receiving the amplified preset signal and switching between an MIMO communication mechanism and a same-frequency suppression mechanism according to the amplified preset signal.
9. The apparatus according to any one of claims 6 to 8, wherein the number of the preprocessing circuits is the same as the number of the anti-phase cancellation circuits, and the preprocessing circuits are electrically connected with the anti-phase cancellation circuits in a one-to-one correspondence.
10. The apparatus according to any one of claims 1 to 8, wherein the predetermined frequency band is 2.4 GHz.
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