CN116032311A - Interference cancellation circuit and method - Google Patents
Interference cancellation circuit and method Download PDFInfo
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- CN116032311A CN116032311A CN202211655192.0A CN202211655192A CN116032311A CN 116032311 A CN116032311 A CN 116032311A CN 202211655192 A CN202211655192 A CN 202211655192A CN 116032311 A CN116032311 A CN 116032311A
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Abstract
The application discloses an interference elimination circuit and an interference elimination method, and belongs to the technical field of communication. The interference cancellation circuit includes: a radio frequency transceiver comprising at least one radio frequency transmit port and a positioning signal receive port; the first switch comprises a first static end, a first movable end and a second movable end, the first static end is connected with the positioning signal receiving port, and the first movable end is connected with the radio frequency antenna; the second switch comprises a second static end, a third movable end and a fourth movable end, the second static end is connected with the radio frequency emission port, the third movable end is connected with the second movable end of the first switch, and the fourth movable end is connected with the emission end of the positioning chip; under the condition of reference signal emission, the second static end of the second switch is conducted with the third dynamic end, and the first static end of the first switch is conducted with the second dynamic end; under the condition of receiving the interference signal, the first static end and the first dynamic end of the first switch are conducted.
Description
Technical Field
The application belongs to the technical field of communication, and particularly relates to an interference elimination circuit and an interference elimination method.
Background
The positioning function of personal electronic devices such as cell phones or tablets or watches is now becoming a standard configuration and very widely used. And with the vigorous development of electronic products, complex electromagnetic environment interference in various scenes is caused. Under some special scenes such as strong interference, the positioning product is in a fixed frequency strong interference environment and can suffer from fixed blocking (blocker) interference, so that the electronic product cannot be positioned normally, and the positioning function is affected.
FIG. 1 is a schematic diagram of a GNSS universal positioning receiver circuit; the transceiver IC is a radio frequency transceiver, and typically includes a cellular main radio frequency transmitting and receiving channel, and a global navigation satellite system (Global Navigation Satellite System, GNSS) positioning signal receiving channel. Wherein Tx_LB, tx_MB and Tx_HB are respectively the low frequency, intermediate frequency and high frequency transmission channels of cellular communication. The GNSS positioning signal receiving channel comprises: band Pass Filters (BPFs), low noise amplifiers (Low Noise Amplifier, LNAs), and the like. The strong blocker interference signal is received from an Antenna (ANT) and sequentially enters elements such as a BPF1, an LNA, a BPF2 and the like, so that the LNA or a follower IC is damaged or the performance is reduced, and finally the problems of system positioning performance reduction or positioning function failure and the like occur.
The interference cancellation methods commonly used at present include: the system detects the received strong blocker interference signal and then judges, the gain is reduced by an automatic gain control (Automatic Gain Control, AGC) circuit in the control chip to reduce the influence of the interference on the receiver, but the gain of the useful signal is synchronously reduced by the AGC circuit at the moment, so that the useful signal exceeds the lowest threshold of an Analog-to-Digital Converter (ADC) sampling circuit, and finally the positioning function is influenced.
Disclosure of Invention
An object of the embodiments of the present application is to provide an interference cancellation circuit and method, which can solve the problem that the interference cancellation method in the prior art cannot cancel the strong blocking interference.
In a first aspect, embodiments of the present application provide an interference cancellation circuit, including:
a radio frequency transceiver comprising at least one radio frequency transmit port and a positioning signal receive port;
the first switch comprises a first static end, a first movable end and a second movable end, the first static end is connected with the positioning signal receiving port, and the first movable end is connected with the radio frequency antenna; the second switch comprises a second static end, a third movable end and a fourth movable end, the second static end is connected with the radio frequency emission port, the third movable end is connected with the second movable end of the first switch, and the fourth movable end is connected with the emission end of the positioning chip;
wherein, under the condition of reference signal emission, the second static end of the second switch is conducted with the third dynamic end, and the first static end of the first switch is conducted with the second dynamic end; the radio frequency emission port outputs a reference signal, and the reference signal is input to the positioning signal receiving port after passing through a second static end of the second switch and the third moving end of the second switch, and a second moving end of the first switch and a first static end of the first switch;
under the condition of receiving an interference signal, the first static end of the first switch is conducted with the first dynamic end; receiving a first interference signal in an environment through the radio frequency antenna, wherein the first interference signal is input to the positioning signal receiving port after passing through a second movable end of the first switch and a first static end of the first switch;
the radio frequency transceiver performs interference cancellation according to the reference signal and the first interference signal input to the positioning signal receiving port.
In a second aspect, embodiments of the present application provide an interference cancellation method applied to an electronic device including an interference cancellation circuit including a radio frequency transceiver, a first switch, and a second switch; the radio frequency transceiver comprises at least one radio frequency transmitting port and a positioning signal receiving port; the first switch comprises a first static end, a first movable end and a second movable end, the first static end is connected with the positioning signal receiving port, and the first movable end is connected with the radio frequency antenna; the second switch comprises a second static end, a third movable end and a fourth movable end, the second static end is connected with the radio frequency emission port, the third movable end is connected with the second movable end of the first switch, and the fourth movable end is connected with the emission end of the positioning chip; the method comprises the following steps:
the radio frequency emission port outputs a reference signal, and the reference signal is input to the positioning signal receiving port after passing through a second static end of the second switch and the third moving end of the second switch, and a second moving end of the first switch and a first static end of the first switch;
receiving a first interference signal in an environment through the radio frequency antenna, wherein the first interference signal is input to the positioning signal receiving port after passing through a second movable end of the first switch and a first static end of the first switch;
and performing interference cancellation according to the reference signal and the first interference signal.
In a third aspect, embodiments of the present application provide an electronic device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method as described in the second aspect.
In a fourth aspect, embodiments of the present application provide a readable storage medium having stored thereon a program or instructions which when executed by a processor perform the steps of the method according to the second aspect.
In a fifth aspect, embodiments of the present application provide a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and where the processor is configured to execute a program or instructions to implement a method according to the second aspect.
In a sixth aspect, embodiments of the present application provide a computer program product stored in a storage medium, the program product being executable by at least one processor to implement the method according to the second aspect.
In the embodiment of the application, the calibration of the strong blocker interference signal in the environment is realized through the reference signal transmitted by the radio frequency transceiver and the first interference signal in the environment, and the interference intensity and the interference frequency point information can be directly obtained, so that the elimination of the strong blocker interference signal in the complex electromagnetic interference environment is realized, and the electronic equipment normally uses the positioning function in the increasingly complex interference environment.
Drawings
FIG. 1 is a schematic diagram of a prior art general positioning receiver circuit;
fig. 2 is a schematic structural diagram of an interference cancellation circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a comparator according to an embodiment of the present disclosure;
fig. 4 is a flowchart illustrating steps of an interference cancellation method according to an embodiment of the present application;
FIG. 5 shows a schematic flow chart of example 1 provided by an embodiment of the present application;
fig. 6 shows one of schematic structural diagrams of an electronic device according to an embodiment of the present application;
fig. 7 shows a second schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The interference cancellation method, the device, the interference cancellation circuit and the electronic equipment provided by the embodiment of the application are described in detail below through specific embodiments and application scenes thereof with reference to the accompanying drawings.
As shown in fig. 2, an embodiment of the present application provides an interference cancellation circuit, including:
a radio frequency transceiver (transceiver IC) comprising at least one radio frequency transmit port tx_mbs 1 and a positioning signal receive port GNSS RX;
the device comprises a first switch SPDT1 and a second switch SPDT2, wherein the first switch SPDT1 comprises a first static end 3, a first moving end 2 and a second moving end 1, the first static end 3 is connected with a positioning signal receiving port GNSS RX, and the first moving end 2 is connected with a radio frequency antenna; the second switch SPDT2 comprises a second static end 6, a third movable end 5 and a fourth movable end 4, wherein the second static end 6 is connected with the radio frequency transmitting port tx_mn1, the third movable end 5 is connected with the second movable end 1 of the first switch, and the fourth movable end 4 is connected with the transmitting end gms_mb_tx or B1/B3 Tx of the positioning chip;
wherein, under the condition of reference signal emission, the second static end 6 of the second switch SPDT2 is conducted with the third moving end 5, and the first static end 3 of the first switch SPDT1 is conducted with the second moving end 1; the radio frequency emission port outputs a reference signal, and the reference signal is input to the positioning signal receiving port GNSS RX after passing through the second static end 6 of the second switch and the third moving end 5 of the second switch, the second moving end 1 of the first switch and the first static end 3 of the first switch;
under the condition of interference signal reception, the first static end 3 of the first switch is conducted with the first dynamic end 2; receiving a first interference signal in the environment through the radio frequency antenna, wherein the first interference signal is input to the positioning signal receiving port GNSS RX after passing through the second movable end 2 of the first switch and the first static end 3 of the first switch;
the radio frequency transceiver performs interference cancellation according to the reference signal and the first interference signal input to the positioning signal receiving port.
As shown in fig. 3, the transceiver IC is a radio frequency transceiver, and generally includes a cellular main radio frequency transmitting and receiving channel, and a global navigation satellite system (Global Navigation Satellite System, GNSS) positioning signal receiving channel. Wherein Tx_LB, tx_MB and Tx_HB are respectively the low frequency, intermediate frequency and high frequency transmission channels of cellular communication. Optionally, the reference signal in the embodiment of the present application, tx_mbs 1 (typically the intermediate frequency transmit ports of LTE band1/band 3) are multiplexed.
Alternatively, the first switch SPDT1 and the second SPDT2 are single pole double throw switches, respectively.
For example, the transmitted reference signal is switched to the GNSS RX port through SPDT1 and SPDT2 by sharing the intermediate frequency transmission tx_mn1 port with the main radio frequency (i.e., SPDT2 is switched to path 5 and SPDT1 is switched to path 1, the transmitted reference signal enters the GNSS RX), and the transmitter IC detects and records in the holding circuit as the currently transmitted reference signal Ref (Reference signal) and the signal strength R.
For another example, a strong blocker interference signal (i.e., a first interference signal) received by the antenna enters the GNSS RX through the rf front-end path at SPDT1 switch 2.
In at least one embodiment of the present application, as shown in fig. 2, the interference cancellation circuit further includes: a radio frequency antenna ANT, a first band-pass filter BPF1, a low noise amplifier LNA, a second band-pass filter BPF2;
the first end of the second band-pass filter BPF2 is connected with the first moving end 2 of the first switch, the second end of the second band-pass filter BPF2 is connected with the first end of the low noise amplifier LNA, the second end of the low noise amplifier LNA is connected with the first end of the first band-pass filter BPF1, and the second end of the first band-pass filter BPF1 is connected with the radio frequency antenna ANT.
For example, the SPDT1 switch switches to path 2, causing the first interfering signal in the environment to enter GNSS RX through ANT, BPF1, LNA, BPF2, SPDT 1.
In at least one embodiment of the present application, the interference cancellation circuit further comprises: a third switch connected in parallel with the low noise amplifier LNA;
when the third switch is closed, the first interference signal received by the radio frequency antenna is not passed through a Low Noise Amplifier (LNA) before being input to the positioning signal receiving port.
In the embodiment of the application, the LNA is additionally provided with a bypass design (namely a third switch), and when the follower IC detects that the blocker interference is strong enough, the LNA is controlled to be switched to a bypass path, so that the path gain is reduced; further amplification interference is prevented and the driver IC is saturated.
As an alternative embodiment, the radio frequency transceiver further comprises: a comparator and an analog-to-digital converter;
the reference signal is input to a first input of the comparator, the first interference signal is input to a second input of the comparator,
the output end of the comparator is connected with the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is used for outputting interference intensity and interference frequency point information;
and the radio frequency transceiver performs interference elimination by adjusting the order and the frequency point of the digital filter according to the interference intensity and the interference frequency point information.
Optionally, as shown IN fig. 3, the comparator is integrated IN the transceiver IC chip and is located IN the analog portion after the down-conversion of the chip, the input signal IN and the reference signal Ref are compared and amplified IN the comparator, and the comparator determines the magnitude of the input signal (blocker interference) through ADC sampling after amplifying, and meanwhile, the whole interference spectrum can be obtained.
As an alternative embodiment, the radio frequency transceiver further comprises: at least one control port GPIO;
the control port is respectively connected with the control end of the first switch, the control end of the second switch and the control end of the third switch; the control device is used for controlling the first switch, the second switch and the third switch to work normally according to instructions.
For example, the driver IC includes: GPIO1, GPIO 2, GPIO3; the GPIO1 is connected with the control end of the third switch and used for controlling the closing and opening of the third switch; the GPIO 2 is connected with the control end of the first switch and used for controlling the conduction path of the first switch; the GPIO3 is connected with the control end of the second switch and used for controlling the conduction path of the second switch.
In summary, in the embodiment of the application, through the reference signal transmitted by the radio frequency transceiver and the first interference signal in the environment, calibration of the strong blocker interference signal in the environment is realized, and the interference intensity and the interference frequency point information can be directly obtained, so that elimination of the strong blocker interference signal in the complex electromagnetic interference environment is realized, and the electronic equipment normally uses the positioning function in the increasingly complex interference environment.
The embodiment of the application provides an interference cancellation method, which is applied to electronic equipment comprising an interference cancellation circuit, as shown in fig. 2, wherein the interference cancellation circuit comprises a radio frequency transceiver (transceiver IC), a first switch SPDT1 and a second switch SPDT2; the radio frequency transceiver comprises at least one Tx_Mb1 and a positioning signal receiving port GNSS RX; the first switch SPDT1 comprises a first static end 3, a first movable end 2 and a second movable end 1, wherein the first static end 3 is connected with the positioning signal receiving port GNSS RX, and the first movable end 2 is connected with a radio frequency antenna; the second switch SPDT2 comprises a second static end 6, a third movable end 5 and a fourth movable end 4, wherein the second static end 6 is connected with the radio frequency transmitting port tx_mn1, the third movable end 5 is connected with the second movable end 1 of the first switch, and the fourth movable end 4 is connected with the transmitting end gms_mb_tx or B1/B3 Tx of the positioning chip; as shown in fig. 4, the method includes:
optionally, the reference signal is a fixed strength signal, for example, the reference signal has a signal strength R.
In this step, the first interfering signal may be understood as an interfering signal in the environment, such as a blocker interfering signal.
And step 403, performing interference cancellation according to the reference signal and the first interference signal.
As an alternative embodiment, step 403 includes:
determining interference intensity and interference frequency point information according to the reference signal and the first interference signal;
and according to the interference intensity and the interference frequency point information, performing interference elimination by adjusting the order and the frequency point of the digital filter.
In the step, the electronic equipment adaptively adjusts the stage and the frequency band of the digital filter according to the measured interference intensity, so that the interference is effectively inhibited, and the blocking interference is effectively eliminated.
Optionally, the interference cancellation method provided in the embodiments of the present application is a strong blocker interference cancellation method. In the case that the positioning system of the electronic device determines that the positioning function is abnormal and is interfered, it is determined that the radio frequency transceiver of the electronic device is in a blocker interference environment, and in this case, the electronic device performs steps 401 to 403 described above.
In at least one embodiment of the present application, the interference cancellation circuit further comprises: a third switch connected in parallel with the low noise amplifier;
controlling the third switch to be closed under the condition that the interference intensity is greater than or equal to a first threshold, wherein the first interference signal does not pass through a low noise amplifier before being input to the positioning signal receiving port;
or alternatively, the process may be performed,
and under the condition that the interference intensity is smaller than the first threshold, the third switch is controlled to be turned off, and the first interference signal is amplified by a low-noise amplifier and then is input to the positioning signal receiving port.
Optionally, the low noise amplifier LNA is a bypassed LNA comprising two states: 1. opening a bypass channel of the LNA, the first interfering signal does not pass through the LNA; 2. closing the bypass channel of the LNA, the first jammer signal passes through the LNA, and the LNA is in a default amplified state.
Optionally, in the case that it is determined that other interference signals in the environment are sufficiently large, the client mobile electronic device may be further reminded to locate at other locations.
In the method provided by the embodiment of the application, after the interference intensity is obtained, the digital filter can be subjected to self-adaptive filtering by setting the first threshold, so that the radio frequency transceiver can work normally in an interference environment; further, according to the comparison result of the interference intensity and the first threshold, a bypass channel of the low noise amplifier LNA is opened or closed, so that the dynamic range is increased.
As an alternative embodiment, the radio frequency transceiver further comprises: a comparator and an analog-to-digital converter;
according to the reference signal and the first interference signal, determining interference strength and interference frequency point information includes:
performing frequency point scanning measurement of a first bandwidth on the first interference signal to obtain a second interference signal;
inputting the reference signal and the second interference signal to a comparator, and obtaining an output signal of the comparator;
and sampling the output signal of the comparator through an analog-to-digital converter, and determining the interference strength and the interference frequency point information.
For example, the first interference signal performs frequency point scanning measurement with a certain bandwidth in the transmitter IC to obtain a second interference signal, the second interference signal is amplified and output after being compared with the reference signal in the comparator, and the amplitude of the second interference signal is determined by ADC sampling to obtain the interference signal intensity Y; for example, the signal strength of the second interference signal is compared with the signal strength R of the reference signal, and interference strengths Y1, Y2, Y3 … …, and interference frequency point information of the respective interference frequency points in the environment are measured.
Further, after step 403, the method further includes: judging whether the positioning function and performance are normal or not; if the interference is normal, the blocking device is eliminated last time, the blocking device detection is closed, and if the interference is abnormal, the positioning function is abnormal after the interference is eliminated, the method further comprises the following steps:
performing frequency point scanning measurement of a second bandwidth on the first interference signal to obtain a third interference signal; the second bandwidth is greater than the first bandwidth;
inputting the reference signal and the third interference signal to a comparator, and obtaining an output signal of the comparator;
and sampling the output signal of the comparator through an analog-to-digital converter, and determining the interference strength and the interference frequency point information.
In other words, if the positioning function is still abnormal after the primary interference cancellation is performed, the frequency bandwidth is continuously enlarged to scan the first interference signal, the obtained third interference signal and the reference signal are input into the comparator, and the interference intensity and the interference scrambling point information are recalculated, so that the interference cancellation is performed again according to the calculated interference intensity; and circularly executing the judgment of whether the positioning function is normal after the interference elimination until the positioning function is normal.
In order to avoid the change of the environment position of the positioning receiver, which results in the change of the interference frequency point, the method provided by the embodiment of the application further comprises the following steps of:
responding to a first operation of a user, and determining interference intensity and interference frequency point information according to the reference signal and the first interference signal again; namely, setting that a user manually starts a recalculation function and automatically recalculating the interference frequency points;
or under the condition that the application scene of the radio frequency transceiver changes, determining the interference intensity and the interference frequency point information again according to the reference signal and the first interference signal; or to automatically recalculate the interference frequency point by determining a user scene change.
It should be noted that, the function of calculating the interference frequency point from the new one only needs to keep the background running (because only the switch in the comparison circuit needs to be switched one or more times, so long as the sampled signal can detect the interference), and the interference is hardly influenced on the real-time positioning.
In summary, in the embodiment of the application, through the reference signal transmitted by the radio frequency transceiver and the first interference signal in the environment, calibration of the strong blocker interference signal in the environment is realized, and the interference intensity and the interference frequency point information can be directly obtained, so that elimination of the strong blocker interference signal in the complex electromagnetic interference environment is realized, and the electronic equipment normally uses the positioning function in the increasingly complex interference environment.
In order to more clearly describe the interference cancellation method provided in the embodiments of the present application, the interference cancellation method is described below with reference to an example and the interference cancellation circuit shown in fig. 2.
Example 1, the positioning procedure as shown in fig. 5, includes:
s01, turning on a GPS function of the electronic equipment and resetting a blocker elimination function.
S02: the positioning system judges whether the positioning function is normal or not and whether the positioning function is interfered or not. If the positioning function/performance is normal, the jump is made directly to S09, and the blocker detection function is not enabled.
S03: when the system judges that the positioning is abnormal, the GNSS positioning receiver is in a blocking er interference environment, tx_Mb1 transmits a fixed strength signal, SPDT2 is switched to path 5 and SPDT1 is switched to path 1, the transmitted signal enters GNSS RX, and the signal strength R is marked in the receiver.
S04, the SPDT1 switch is switched to a path 2, so that interference signals in the environment enter the GNSS RX through the ANT, the BPF1, the LNA, the BPF2 and the SPDT 1. The interference signal can perform frequency point scanning measurement with a certain bandwidth in the transmitter IC.
S05, comparing the interference signal with a reference signal in a comparator, amplifying and outputting the interference signal and the reference signal, and sampling the interference signal and the reference signal by an ADC to determine the size to obtain the intensity Y of the interference signal; i.e. comparing with R, the interference intensities Y1, Y2, Y3 … …, and interference frequency point information in the environment are measured.
S06, judging through a threshold Z2, when the interference Y is more than or equal to Z2, opening an LNA bypass channel function to enable a strong blocker interference signal not to pass through the LNA, and meanwhile, adaptively adjusting a filtering depth and a frequency point by a digital filter in a transmitter IC according to the measured interference intensity to inhibit interference, so that the maximum dynamic range is achieved.
When the interference intensity Y is smaller than Z2, the LNA is in a default amplifying state, the order and the frequency point of the digital filter are adaptively adjusted according to the measured interference signal intensity, the interference is effectively restrained, and the blocking interference is effectively eliminated.
S07, judging whether the positioning function and the performance are normal.
S08: if normal, the blocking device is kept to be removed last time and the blocking device detection is closed, and if abnormal, S04 can be entered to continue to expand the frequency bandwidth scanning.
S09: normal positioning, ending the detection function and keeping the last blocking er eliminating action (the register value is unchanged).
In summary, the interference cancellation circuit provided by the embodiment of the application can effectively solve the problem that the current GNSS circuit cannot calibrate the blocker interference intensity, can directly obtain the interference intensity and the interference frequency point information, and after the interference intensity is obtained, the digital filter performs self-adaptive filtering to enable the receiver to normally work in an interference environment, or dynamically adjust the bypass function of the radio frequency front-end LNA according to the interference intensity, and further adjusts the order of the digital filter through digital, so as to deeply and adaptively filter the interference; the problem that performance of the transceiver IC is damaged or disabled after the high-power blocker interference enters the transceiver IC can be avoided.
Optionally, as shown in fig. 6, the embodiment of the present application further provides an electronic device 700, including a processor 701 and a memory 702, where the memory 702 stores a program or an instruction that can be executed on the processor 701, and the program or the instruction implements each step of the above-mentioned interference cancellation method embodiment when executed by the processor 701, and can achieve the same technical effect, so that repetition is avoided, and no further description is given here.
The electronic device in the embodiment of the application includes the mobile electronic device and the non-mobile electronic device described above.
Fig. 7 is a schematic hardware structure of an electronic device implementing an embodiment of the present application.
The electronic device 800 includes, but is not limited to: radio frequency unit 801, network module 802, audio output unit 803, input unit 804, sensor 805, display unit 806, user input unit 807, interface unit 808, memory 809, and processor 810.
Those skilled in the art will appreciate that the electronic device 800 may also include a power source (e.g., a battery) for powering the various components, which may be logically connected to the processor 810 by a power management system to perform functions such as managing charge, discharge, and power consumption by the power management system. The electronic device structure shown in fig. 7 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than shown, or may combine certain components, or may be arranged in different components, which are not described in detail herein.
The radio frequency unit 801 is configured to transmit a reference signal, where the reference signal passes through a second static end of the second switch, the third moving end of the second switch, a second moving end of the first switch, and the first static end of the first switch and then is input to the positioning signal receiving port;
the radio frequency unit 801 is further configured to receive a first interference signal in an environment through the radio frequency antenna, where the first interference signal is input to the positioning signal receiving port after passing through the second moving end of the first switch and the first static end of the first switch;
a processor 810 is configured to perform interference cancellation according to the reference signal and the first interference signal.
In the embodiment of the application, the calibration of the strong blocker interference signal in the environment is realized through the reference signal transmitted by the radio frequency transceiver and the first interference signal in the environment, and the interference intensity and the interference frequency point information can be directly obtained, so that the elimination of the strong blocker interference signal in the complex electromagnetic interference environment is realized, and the electronic equipment normally uses the positioning function in the increasingly complex interference environment.
It should be noted that, the electronic device provided in the embodiment of the present application is an electronic device capable of executing the above-mentioned interference cancellation method, and all embodiments of the above-mentioned interference cancellation method are applicable to the electronic device, and can achieve the same or similar beneficial effects, which are not repeated here.
It should be appreciated that in embodiments of the present application, the input unit 804 may include a graphics processor (Graphics Processing Unit, GPU) 8041 and a microphone 8042, with the graphics processor 8041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 806 may include a display panel 8061, and the display panel 8061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 807 includes at least one of a touch panel 8071 and other input devices 8072. Touch panel 8071, also referred to as a touch screen. The touch panel 8071 may include two parts, a touch detection device and a touch controller. Other input devices 8072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.
The memory 809 can be used to store software programs as well as various data. The memory 809 may mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 809 may include volatile memory or nonvolatile memory, or the memory x09 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory 809 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.
The processor 810 may include one or more processing units; optionally, the processor 810 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, etc., and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 810.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored, and when the program or the instruction is executed by a processor, the processes of the foregoing embodiments of the interference cancellation method are implemented, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.
Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.
The embodiment of the application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used for running a program or an instruction, so as to implement each process of the above-mentioned interference cancellation method embodiment, and achieve the same technical effect, so that repetition is avoided, and no redundant description is provided here.
It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.
The embodiments of the present application provide a computer program product stored in a storage medium, where the program product is executed by at least one processor to implement the respective processes of the embodiments of the interference cancellation method described above, and achieve the same technical effects, and are not repeated herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
Claims (10)
1. An interference cancellation circuit, comprising:
a radio frequency transceiver comprising at least one radio frequency transmit port and a positioning signal receive port;
the first switch comprises a first static end, a first movable end and a second movable end, the first static end is connected with the positioning signal receiving port, and the first movable end is connected with the radio frequency antenna; the second switch comprises a second static end, a third movable end and a fourth movable end, the second static end is connected with the radio frequency emission port, the third movable end is connected with the second movable end of the first switch, and the fourth movable end is connected with the emission end of the positioning chip;
wherein, under the condition of reference signal emission, the second static end of the second switch is conducted with the third dynamic end, and the first static end of the first switch is conducted with the second dynamic end; the radio frequency emission port outputs a reference signal, and the reference signal is input to the positioning signal receiving port after passing through a second static end of the second switch and the third moving end of the second switch, and a second moving end of the first switch and a first static end of the first switch;
under the condition of receiving an interference signal, the first static end of the first switch is conducted with the first dynamic end; receiving a first interference signal in an environment through the radio frequency antenna, wherein the first interference signal is input to the positioning signal receiving port after passing through a second movable end of the first switch and a first static end of the first switch;
the radio frequency transceiver performs interference cancellation according to the reference signal and the first interference signal input to the positioning signal receiving port.
2. The interference cancellation circuit of claim 1, wherein the interference cancellation circuit further comprises: a radio frequency antenna, a first band-pass filter, a low noise amplifier and a second band-pass filter;
the first end of the second band-pass filter is connected with the first movable end of the first switch, the second end of the second band-pass filter is connected with the first end of the low-noise amplifier, the second end of the low-noise amplifier is connected with the first end of the first band-pass filter, and the second end of the first band-pass filter is connected with the radio-frequency antenna.
3. The interference cancellation circuit of claim 2, wherein the interference cancellation circuit further comprises: a third switch connected in parallel with the low noise amplifier;
and under the condition that the third switch is closed, the first interference signal received by the radio frequency antenna does not pass through a low noise amplifier before being input to the positioning signal receiving port.
4. The interference cancellation circuit of any one of claims 1-3, wherein the radio frequency transceiver further comprises: a comparator and an analog-to-digital converter;
the reference signal is input to a first input of the comparator, the first interference signal is input to a second input of the comparator,
the output end of the comparator is connected with the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is used for outputting interference intensity and interference frequency point information;
and the radio frequency transceiver performs interference elimination by adjusting the order and the frequency point of the digital filter according to the interference intensity and the interference frequency point information.
5. The interference cancellation circuit of claim 1 or 3, wherein the radio frequency transceiver further comprises: at least one control port;
the control port is respectively connected with the control end of the first switch, the control end of the second switch and the control end of the third switch.
6. An interference cancellation method applied to an electronic device comprising an interference cancellation circuit, characterized in that the interference cancellation circuit comprises a radio frequency transceiver, a first switch and a second switch; the radio frequency transceiver comprises at least one radio frequency transmitting port and a positioning signal receiving port; the first switch comprises a first static end, a first movable end and a second movable end, the first static end is connected with the positioning signal receiving port, and the first movable end is connected with the radio frequency antenna; the second switch comprises a second static end, a third movable end and a fourth movable end, the second static end is connected with the radio frequency emission port, the third movable end is connected with the second movable end of the first switch, and the fourth movable end is connected with the emission end of the positioning chip; the method comprises the following steps:
the radio frequency emission port outputs a reference signal, and the reference signal is input to the positioning signal receiving port after passing through a second static end of the second switch and the third moving end of the second switch, and a second moving end of the first switch and a first static end of the first switch;
receiving a first interference signal in an environment through the radio frequency antenna, wherein the first interference signal is input to the positioning signal receiving port after passing through a second movable end of the first switch and a first static end of the first switch;
and performing interference cancellation according to the reference signal and the first interference signal.
7. The method of claim 6, wherein said performing interference cancellation based on said reference signal and said first interfering signal comprises:
determining interference intensity and interference frequency point information according to the reference signal and the first interference signal;
and according to the interference intensity and the interference frequency point information, performing interference elimination by adjusting the order and the frequency point of the digital filter.
8. The method of claim 7, wherein the interference cancellation circuit further comprises: a third switch connected in parallel with the low noise amplifier;
controlling the third switch to be closed under the condition that the interference intensity is greater than or equal to a first threshold, wherein the first interference signal does not pass through a low noise amplifier before being input to the positioning signal receiving port;
or alternatively, the process may be performed,
and under the condition that the interference intensity is smaller than the first threshold, the third switch is controlled to be turned off, and the first interference signal is amplified by a low-noise amplifier and then is input to the positioning signal receiving port.
9. The method of claim 7, wherein the radio frequency transceiver further comprises: a comparator and an analog-to-digital converter;
according to the reference signal and the first interference signal, determining interference strength and interference frequency point information includes:
performing frequency point scanning measurement of a first bandwidth on the first interference signal to obtain a second interference signal;
inputting the reference signal and the second interference signal to a comparator, and obtaining an output signal of the comparator;
and sampling the output signal of the comparator through an analog-to-digital converter, and determining the interference strength and the interference frequency point information.
10. The method of claim 9, wherein a number of post-interference cancellation locating dysfunctions, the method further comprising:
performing frequency point scanning measurement of a second bandwidth on the first interference signal to obtain a third interference signal;
the second bandwidth is greater than the first bandwidth;
inputting the reference signal and the third interference signal to a comparator, and obtaining an output signal of the comparator;
and sampling the output signal of the comparator through an analog-to-digital converter, and determining the interference strength and the interference frequency point information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211655192.0A CN116032311A (en) | 2022-12-21 | 2022-12-21 | Interference cancellation circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211655192.0A CN116032311A (en) | 2022-12-21 | 2022-12-21 | Interference cancellation circuit and method |
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| CN116032311A true CN116032311A (en) | 2023-04-28 |
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| CN202211655192.0A Pending CN116032311A (en) | 2022-12-21 | 2022-12-21 | Interference cancellation circuit and method |
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| Country | Link |
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| CN (1) | CN116032311A (en) |
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- 2022-12-21 CN CN202211655192.0A patent/CN116032311A/en active Pending
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