CN109257065A

CN109257065A - A kind of method and circuit, terminal for eliminating mutual interference

Info

Publication number: CN109257065A
Application number: CN201810942597.XA
Authority: CN
Inventors: 张洲川
Original assignee: Oppo Chongqing Intelligent Technology Co Ltd
Current assignee: Oppo Chongqing Intelligent Technology Co Ltd
Priority date: 2018-08-17
Filing date: 2018-08-17
Publication date: 2019-01-22
Anticipated expiration: 2038-08-17
Also published as: CN109257065B

Abstract

The embodiment of the invention discloses a kind of methods and circuit, terminal for eliminating mutual interference, wherein, the described method includes: receiving the first reception signal in the first receives link, first receives link and described first is sent in the first transmitting link and emits the first transmission signal of the shared RF IC RFIC output of link；Wherein, first receives link includes first filter and low-noise amplifier LNA；The first reception signal is filtered using the first filter in first receives link, to filter out the described first main wave signal for sending signal, obtains the second reception signal；The second reception signal is input to low-noise amplifier LNA and the RFIC in first receives link.

Description

Method, circuit and terminal for eliminating coexistence interference

Technical Field

The present invention relates to terminal technologies, and in particular, to a method, a circuit, and a terminal for eliminating coexistence interference.

Background

In order to meet different communication requirements of users, a plurality of radio technologies are integrated in the same terminal equipment. For example, a Long Term Evolution (LTE) radio technology module, a Wireless Local Area Network (WLAN) radio technology module, and a Bluetooth (BT) radio technology module are integrated in one terminal device. However, when multiple radio technology modules are designed in the same terminal device, due to the limited volume of the terminal device, the spatial isolation between the antenna ports corresponding to adjacent radio technology modules cannot be designed to be large enough, so that when each radio technology module in the same terminal device operates in an adjacent frequency band, one of the radio technology modules transmits a signal, the signal reception of the other radio technology module is interfered, and vice versa, and this adjacent frequency interference phenomenon is referred to in the art as "in-device coexistence interference".

At present, many methods for testing and verifying the occurrence of in-device coexistence interference in the terminal device are available, but these methods cannot optimally solve the problem of in-device coexistence interference.

Disclosure of Invention

Embodiments of the present invention provide a method, a circuit, and a terminal for eliminating coexistence interference to solve at least one problem in the related art.

The technical scheme of the embodiment of the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides a method for eliminating coexistence interference, where the method includes:

receiving a first receiving signal at a first receiving link, and transmitting a first transmitting signal output by a Radio Frequency Integrated Circuit (RFIC) shared by the first receiving link and the first transmitting link at a first transmitting link; wherein the first receive chain comprises a first filter and a Low-noise amplifier (LNA);

filtering the first receiving signal by using a first filter on the first receiving link to filter a main wave signal of the first sending signal to obtain a second receiving signal;

inputting the second receive signal to a Low Noise Amplifier (LNA) and the RFIC on the first receive chain.

In a second aspect, an embodiment of the present invention provides another method for eliminating coexistence interference, where the method includes:

receiving a first receiving signal at a third receiving link, and transmitting a first transmitting signal output by a Radio Frequency Integrated Circuit (RFIC) shared by the third receiving link and the first transmitting link at a first transmitting link; wherein the third receive chain comprises a Low Noise Amplifier (LNA) and a second filter;

amplifying the first receiving signal by using a Low Noise Amplifier (LNA) on the third receiving link to obtain a fifth receiving signal;

and performing filtering processing on the fifth receiving signal by using a second filter on the third receiving link to filter the spurious signals generated by the LNA and the main wave signal of the first transmitting signal, so as to obtain a sixth receiving signal.

In a third aspect, an embodiment of the present invention provides a circuit for eliminating coexistence interference, where the circuit includes: a first receive chain, a first transmit chain, a Radio Frequency Integrated Circuit (RFIC) common to the first receive chain and the first transmit chain; wherein the first receive chain comprises a first filter and a Low Noise Amplifier (LNA);

the first receiving chain is used for receiving a first receiving signal;

the first transmitting link is used for transmitting a first transmitting signal output by the RFIC;

the first filter is configured to perform filtering processing on the first received signal to filter a main wave signal of the first transmitted signal, so as to obtain a second received signal;

and the LNA is used for amplifying the second receiving signal and then inputting the second receiving signal to the RFIC.

In a fourth aspect, an embodiment of the present invention provides another circuit for canceling coexistence interference, where the circuit includes: a Radio Frequency Integrated Circuit (RFIC) shared by a third receive chain, a first transmit chain, the third receive chain and the first transmit chain; wherein the third receive chain comprises a Low Noise Amplifier (LNA) and a second filter;

the third receiving chain is used for receiving a first receiving signal;

the LNA is used for amplifying the first receiving signal to obtain a fifth receiving signal;

the second filter is configured to perform filtering processing on the fifth receiving signal to filter the spurious signal generated by the LNA and the main wave signal of the first transmitting signal, so as to obtain a sixth receiving signal.

In a fifth aspect, an embodiment of the present invention provides a terminal, where the terminal includes the circuit for eliminating coexistence interference according to any one of the foregoing embodiments.

In the embodiment of the present invention, before the first received signal is input to the low noise amplifier LNA, the first received signal is filtered by the first filter to filter the main wave signal of the first transmitted signal superimposed in the first received signal, so as to reduce the risk of blocking the LNA and improve the receiving performance of the first received signal.

Drawings

Fig. 1A is a schematic diagram illustrating a structure of a circuit for eliminating coexistence interference according to an embodiment of the present invention;

FIG. 1B is a schematic diagram of another circuit for canceling coexistence interference according to an embodiment of the present invention;

FIG. 1C is a schematic diagram illustrating a structure of a circuit for canceling coexistence interference according to another embodiment of the present invention;

fig. 2A is a flowchart illustrating an implementation of a method for canceling coexistence interference according to an embodiment of the present invention;

fig. 2B is a schematic flow chart illustrating an implementation of a method for determining a first receiving link according to an embodiment of the present invention;

fig. 2C is a schematic structural diagram of an antenna circuit according to an embodiment of the present invention;

fig. 2D is a schematic flow chart illustrating an implementation of a method for determining the receive sensitivity of an RFIC according to an embodiment of the present invention;

fig. 2E is a schematic flow chart illustrating another implementation of a method for canceling coexistence interference according to an embodiment of the present invention;

fig. 2F is a schematic flowchart illustrating an implementation of a method for determining a first transmission link according to an embodiment of the present invention;

fig. 2G is a flowchart illustrating another implementation of a method for canceling coexistence interference according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a structure of a circuit for eliminating coexistence interference according to an embodiment of the present invention;

fig. 4A is a flowchart illustrating another implementation of a method for canceling coexistence interference according to an embodiment of the present invention;

fig. 4B is a flowchart illustrating an implementation of a method for determining a third receiving link according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a dual-band antenna according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a single-frequency antenna according to an embodiment of the present invention;

fig. 7A is a schematic structural diagram of a dual-band antenna for eliminating coexistence interference according to an embodiment of the present invention;

fig. 7B is a schematic structural diagram of another dual-band antenna for canceling coexistence interference according to an embodiment of the present invention;

fig. 7C is a schematic structural diagram of another dual-band antenna for canceling coexistence interference according to an embodiment of the present invention;

fig. 7D is a schematic structural diagram of another dual-band antenna for eliminating coexistence interference according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a test topology of a dual-band antenna according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a test topology of a single-frequency antenna according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further elaborated below with reference to the drawings and the embodiments.

In this embodiment, a circuit for eliminating coexistence interference is provided, and fig. 1A is a schematic structural diagram of a circuit for eliminating coexistence interference according to an embodiment of the present invention, as shown in fig. 1A, the circuit 10 includes: a first receiving chain 11, a first transmitting chain 12, a radio frequency integrated circuit RFIC 13 common to the first receiving chain 11 and the first transmitting chain 12; wherein the first receiving chain 11 comprises a first filter 111 and a low noise amplifier LNA 112;

the first receiving chain 11 is configured to receive a first receiving signal;

the first transmission link 12 is configured to transmit a first transmission signal output by the RFIC 13;

the first filter 111 is configured to perform filtering processing on the first received signal to filter a main wave signal of the first transmitted signal, so as to obtain a second received signal;

it is understood that if the main wave signal of the first transmission signal is received by the first receiving link and amplified by the LNA112, the LNA may be blocked if the strength of the signal entering the LNA112 exceeds a certain threshold, and therefore, the first filter 111 may be added before the LNA, so as to avoid the blocking of the LNA caused by the main wave signal of the first transmission signal entering the LNA together with the first receiving signal.

The LNA112 is configured to amplify the second receiving signal and then input the amplified second receiving signal to the RFIC 13.

In other embodiments, as shown in fig. 1B, the first transmit chain 12 includes a Power Amplifier (PA) 121 and a third filter 122; wherein,

the PA121 is configured to perform power amplification on the first transmission signal output by the RFIC 13 to obtain a second transmission signal;

the third filter 122 is configured to perform filtering processing on the second transmit signal to filter a spurious signal generated by the PA121, so as to obtain a third transmit signal.

It is understood that the spurious signal generated on the first transmit chain 12 may also enter the first receive chain 11 to be superimposed with the first receive signal as noise, and then enter the LNA112 to be amplified by the LNA112, so as to reduce the signal-to-noise ratio of the first receive signal, thereby interfering with the receiving performance of the first receive chain 11 when receiving the first receive signal. Therefore, in order to prevent the spurious signal generated by the PA121 from affecting the receiving performance of the first received signal, a third filter 122 may be added to the output end of the PA121 on the first transmit chain 12 to filter the spurious signal generated by the PA121, so as to improve the receiving performance of the first received signal.

In other embodiments, as shown in fig. 1C, the first transmit chain 12 comprises a power amplifier PA123 and a fourth filter 124; wherein,

the fourth filter 124 is configured to filter the first transmission signal output by the RFIC 13, so as to filter stray signals generated by the RFIC 13, and obtain a fifth transmission signal;

it is understood that the spurious signals may also be generated by RFIC 13, and therefore, a fourth filter 124 may be added at the output of RFIC 13 to filter the spurious signals generated by RFIC 13, reducing the impact on the reception performance of the first received signal.

The PA123 is configured to perform power amplification on the fifth transmit signal to obtain a sixth transmit signal.

Based on the circuit described in the foregoing embodiment, fig. 2A provides a method for eliminating coexistence interference according to an embodiment of the present invention, and as shown in fig. 2A, the method includes:

s201, receiving a first receiving signal in a first receiving link 11, and transmitting a first transmitting signal output by a radio frequency integrated circuit RFIC 13 shared by the first receiving link 11 and the first transmitting link 12 in a first transmitting link 12;

as shown in fig. 1A, the first receiving chain 11 includes a first filter 111 and a low noise amplifier LNA 112;

s202, filtering the first received signal by using the first filter 111 on the first receiving link 11 to filter a main wave signal of the first transmitted signal, so as to obtain a second received signal;

s203, inputting the second receiving signal to a low noise amplifier LNA112 and the RFIC 13 on the first receiving chain.

In the embodiment of the present invention, a method for eliminating coexistence interference is provided, where a first filter 111 on a first receiving link 11 is used to perform filtering processing on a first receiving signal to filter a main wave signal of the first transmitting signal, and then a second receiving signal obtained after the filtering processing is input to an LNA, so as to reduce a blocking probability of the LNA and improve a receiving performance of the first receiving signal.

In other embodiments, as shown in fig. 2B, the method further comprises the steps of:

s204, inputting the first receiving signal to a low noise amplifier LNA 211 in the second receiving chain 21;

wherein, as shown in fig. 2C, the second receiving chain 21 comprises a low noise amplifier LNA 211; the second transmit chain 22 comprises a power amplifier PA 221; the second receiving chain 21 and the second transmitting chain 22 share a radio frequency integrated circuit RFIC 23;

s205, if the LNA 211 on the second receive chain 21 is blocked, adding the first filter 111 before the LNA 211 of the second receive chain 21 to obtain the first receive chain 11, so that the first receive signal is filtered by the first filter 111 and then input to the LNA 211 and the RFIC 23.

It is understood that, in order to solve the problem of in-device coexistence interference with less filters on the premise of the minimum impact on the receiving performance of the first receiving signal, in the embodiment of the present invention, the first receiving signal is first input to the low noise amplifier LNA 211 in the unmodified second receiving link 21, and at this time, if blocking of the LNA 211 on the second receiving link 21 is detected, the first filter 111 is added before the LNA 211 of the second receiving link 21 before modification, so as to obtain the modified first receiving link 11, so that the first receiving signal is filtered by the first filter 111 before being input to the LNA 211 and the RFIC 23. In this way, the in-device coexistence interference problem can be specifically solved by adding fewer filters, that is, if the LNA 211 on the second receiving link 21 is blocked, the first filter 111 is added before the LNA 211 of the second receiving link 21 to filter out the main wave signal of the first transmitting signal on the second receiving link 21, so as to optimally solve the in-device coexistence interference problem.

In other embodiments, the method further comprises: if the receiving sensitivity of the RFIC 23 shared by the second receiving chain 21 and the second transmitting chain 22 is smaller than a preset first threshold, it is determined that the LNA 211 is blocked.

In other embodiments, as shown in fig. 2D, the method further comprises:

s206, inputting the first receiving signal to the LNA 211 of the second receiving link 21 to obtain a third receiving signal;

s207, inputting the third receiving signal into an RFIC 23 shared by the second receiving link 21 and the second transmitting link 22, so as to obtain a fourth receiving signal;

and S208, determining the receiving sensitivity of the RFIC 23 shared by the second receiving chain 21 and the second transmitting chain 22 according to the fourth receiving signal.

In other embodiments, as shown in fig. 1B, the first transmission chain 12 comprises a power amplifier PA121 and a third filter 122, wherein, as shown in fig. 2E, the method further comprises the steps of:

s209, performing power amplification on the first transmission signal output by the RFIC 13 by using the power amplifier PA121 on the first transmission link 12 to obtain a second transmission signal;

s210, inputting the second transmission signal to the third filter 122 to filter the spurious signal generated by the PA121, so as to obtain a third transmission signal.

In other embodiments, as shown in fig. 2F, the method further comprises:

s211, inputting a first transmission signal output by the radio frequency integrated circuit RFIC 23 shared by the second receiving link 21 and the second transmitting link 22 to the power amplifier PA221 on the second transmitting link 22, so as to obtain a fourth transmission signal;

wherein, as shown in fig. 2C, the second transmission chain 22 comprises a power amplifier PA 221;

s212, if there is a spurious signal in the fourth transmission signal, adding the third filter 122 after the PA221 on the second transmission link 22 to obtain the first transmission link 12, so that the fourth transmission signal is filtered by the third filter 122, and the spurious signal generated by the PA221 is filtered.

Generally, if the signal strength of the fourth transmission signal is greater than a second predetermined threshold, a spurious signal is determined in the fourth transmission signal. It can be understood that, if there is a spurious signal in the fourth transmission signal, it can be determined that the spurious signal is generated by the power amplifier PA221 when the first transmission signal passes through the power amplifier PA221 on the second transmission link 22, so that a third filter 122 can be added after the PA221 (i.e. at the output end of the PA 221) to filter the spurious signal generated by the PA221, and thus, by determining the position where the spurious signal is generated, the structure of the second reception link 21 can be specifically improved, i.e. the position of the filter to be added is determined, so as to optimally solve the influence of the spurious signal on the reception performance of the first reception signal.

In other embodiments, as shown in fig. 1C, the first transmission chain 12 includes a power amplifier PA123 and a fourth filter 124, wherein, as shown in fig. 2G, the method further includes:

s213, filtering the first transmission signal output by the RFIC 13 by using the fourth filter 124 on the first transmission link 12, so as to filter the spurious signal generated by the RFIC 13, and obtain a fifth transmission signal;

s214, inputting the fifth transmission signal to the PA123 to obtain a sixth transmission signal.

In other embodiments, the method further comprises:

if there is a spurious signal in the first transmission signal output by the radio frequency integrated circuit RFIC 23 shared by the second receiving link 21 and the second transmitting link 22, the fourth filter 124 is added before the PA221 on the second transmitting link 22 and after the RFIC 23, so as to obtain the first transmitting link 12, so that the first transmission signal is filtered by the fourth filter 124 to filter the spurious signal generated by the RFIC 23, and then is input to the PA 221.

Generally, if the signal strength of the first transmission signal is greater than a preset third threshold, a spurious signal is determined in the first transmission signal. It is understood that if there is a spurious signal in the first transmission signal output by the RFIC 23, it may be determined that the spurious signal is generated by the RFIC 23, and then the spurious signal generated by the RFIC 23 may be filtered by adding the fourth filter 124 to the output terminal of the RFIC 23.

Another circuit for eliminating coexistence interference according to an embodiment of the present invention is provided, and fig. 3 is a schematic structural diagram of a circuit for eliminating coexistence interference according to an embodiment of the present invention, as shown in fig. 3, the circuit 30 includes: a third receive chain 31, a first transmit chain 32, a radio frequency integrated circuit RFIC 33 common to the third receive chain 31 and the first transmit chain 32; wherein the third receiving chain 31 comprises a low noise amplifier LNA311 and a second filter 312;

the third receiving chain 31 is used for receiving a first receiving signal;

the first transmission link 32 is configured to transmit a first transmission signal output by the RFIC 33;

the LNA311 is configured to amplify the first receiving signal to obtain a fifth receiving signal;

the second filter 312 is configured to perform filtering processing on the fifth receiving signal to filter the spurious signal generated by the LNA311 and the main wave signal of the first transmitting signal, so as to obtain a sixth receiving signal.

Based on the above circuit, an embodiment of the present invention provides another method for eliminating coexistence interference, and fig. 4A is a schematic flow chart of another method for eliminating coexistence interference according to an embodiment of the present invention, as shown in fig. 4A, the method includes:

s401, receiving a first receiving signal in a third receiving link 31, and transmitting a first transmitting signal output by a radio frequency integrated circuit RFIC 33 shared by the third receiving link 31 and the first transmitting link 32 in a first transmitting link 32;

as shown in fig. 3, the third receiving chain 31 includes a low noise amplifier LNA311 and a second filter 312;

s402, amplifying the first received signal by using the low noise amplifier LNA311 on the third receiving link 31 to obtain a fifth received signal;

s403, filtering the fifth receiving signal by using the second filter 312 on the third receiving link 31, so as to filter the spurious signal generated by the LNA311 and the main wave signal of the first transmitting signal, and obtain a sixth receiving signal.

It can be understood that, even if the LNA311 does not block the low noise amplifier LNA311 when the LNA311 amplifies the first received signal, in order to prevent the main wave signal of the first transmitted signal from entering the RFIC 33 after being amplified by the LNA311, and trigger the automatic gain control AGC inside the RFIC 33 to automatically lower the gain, the fifth received signal still needs to be filtered, and then the resulting sixth received signal is input to the RFIC 33.

In other embodiments, as shown in fig. 4B, the method further comprises:

s404, inputting the first reception signal to a low noise amplifier LNA 211 in the second reception chain 21;

s405, if the LNA 211 on the second receiving link 21 is not blocked, the second filter 312 is added after the LNA 211 of the second receiving link 21 and before the RFIC 23 to obtain the third receiving link 31, so that the first receiving signal is amplified by the LNA 211 and then input to the second filter 312 and the RFIC 23.

It can be understood that when the first receiving signal is input to the LNA 211 in the second receiving chain 21 before being modified, if the LNA 211 is not blocked, the second filter 312 may be added after the LNA 211 of the second receiving chain 21 and before the RFIC 23, so as to prevent the main wave signal of the first transmitting signal from entering the RFIC 23 after being amplified by the LNA311, and the spurious signal generated by the LNA 211 from entering the RFIC 23, so as to trigger the automatic gain control AGC inside the RFIC 23 to automatically reduce the gain, which results in the reduction of the receiving performance of the first receiving signal.

In other embodiments, the method further comprises:

determining that the LNA is not blocked if the reception sensitivity of an RFIC shared by the second receive chain and the second transmit chain is greater than or equal to a preset first threshold.

Along with the increasing of the frequency range of Wireless products, coexistence interference among modules seriously restricts the Wireless performance of the products, for example, the multi-frequency Wireless coexistence easily causes LNA (low noise amplifier) blocking and influences the receiving sensitivity of received signals, and simultaneously, the Wireless communication system is similar to a Wireless local area network (Wifi) based on the IEEE802.11b standard; when frequency bands close to Long Term Evolution (LTE) and frequency-close modules such as band1 of a Digital Enhanced radio communication system (DECT) and a Wideband Code Division Multiple Access (WCDMA) coexist, interference can be introduced due to the problems of sidebands and spurs, the signal-to-noise ratio is reduced, and the receiving performance of a product is affected. Based on this, the embodiment of the present invention provides a method for eliminating coexistence interference, and aims to apply the method to design and debugging of a multi-frequency wireless product, well explain inter-band interference causes, accurately measure an optimization target, solve the coexistence interference problem in the device by using fewer filter elements on the premise of minimizing the influence on the reception performance, improve the development efficiency of the product, and reduce the product cost.

Before providing the method for eliminating coexistence interference according to the embodiment of the present invention, the cause of the in-device coexistence interference is first analyzed. It is assumed that the a-band signal (i.e., the first transmission signal in the above embodiment) is an interference source, for example, the a-band signal is band1, and the B-band signal (i.e., the first reception signal in the above embodiment) is an interfered object, for example, the B-band signal is band 2. The type of interference between these two frequency bands can be divided into two aspects: in the first aspect, the interference type is dominant-wave interference, and assuming that a dominant-wave signal of the a-band signal is received by an antenna receiving the B-band signal and amplified by the low noise amplifier LNA, if a signal input to the LNA is too strong, the LNA may be blocked. In addition, the main wave signal of the a-band signal amplified by the LNA enters the radio frequency integrated circuit RFIC, and triggers Automatic Gain Control (AGC) inside the RFIC to automatically reduce the gain. However, the reception performance of the B band is affected by both blocking of the LNA and automatic gain reduction of the AGC. In the second aspect, the interference type is spurious interference, and if a frequency band signal generates spurious signals on a transmission link, the spurious signals may enter the LNA as noise after being superimposed with a frequency band B signal, so that the spurious signals are amplified by the LNA, the output signal-to-noise ratio of the LNA is reduced, and the reception performance of the frequency band B signal is interfered.

In addition, two common antenna structures are provided, where fig. 5 is a schematic structural diagram of a dual-band antenna according to an embodiment of the present invention, as shown in fig. 5, the antenna 50 includes a second receiving link 51, a second transmitting link 52, a radio frequency integrated circuit RFIC 53 shared by the second receiving link 51 and the second transmitting link 52, a duplex antenna port 53, and a duplexer 54 shared by the second receiving link 51 and the second transmitting link 52; wherein the second receiving chain 51 comprises a low noise amplifier LNA511, an input end of the LNA511 is connected with an output end of the duplexer 54, and an output section of the LNA511 is connected with the RFIC 53; the second transmission chain 52 comprises a power amplifier PA 521, an input end of the PA 521 is connected with the RFIC 53, and an output end of the PA 521 is connected with an input end of the duplexer 54; the duplexer 54 is connected to the duplex antenna port 53;

the duplex antenna port 53 is configured to receive a B-band signal, and input the B-band signal to the LNA511 through the duplexer 54;

the LNA511 is configured to amplify the B-band signal and input the amplified B-band signal to the RFIC 53;

the PA 521 is configured to perform power amplification on the a-band signal output by the RFIC 53, and then input the a-band signal to the duplexer 54 and the duplex antenna port 53;

fig. 6 is a schematic structural diagram of a single-frequency antenna, as shown in fig. 6, the antenna 60 includes a first antenna port 61, a second transmitting chain 62, a second receiving chain 63, a second antenna port 64, and a radio frequency integrated circuit RFIC 65 shared by the second transmitting chain 62 and the second receiving chain 63; wherein the second transmit chain 62 comprises a power amplifier PA 621, an input of the PA 621 is connected to the RFIC 65, and an output of the PA 621 is connected to the first antenna port 61; the second receive chain 63 comprises a low noise amplifier LNA631, an input of the LNA631 being connected to the second antenna port 64, an output of the LNA631 being connected to the RFIC 65;

the second antenna port 64 is configured to receive a B-band signal and input the B-band signal to the LNA 631;

the LNA631 is configured to amplify the B-band signal and input the amplified B-band signal to the RFIC 65;

the PA 621 is configured to perform power amplification on the a-band signal output by the RFIC 65, and then send the a-band signal through the first antenna port 61.

Based on this, a method for eliminating coexistence interference provided by the embodiments of the present invention is: first, the antenna isolation of the duplexer 54 of the dual-band antenna 50 or the antenna isolation of the single-band antenna 60 needs to be increased, so as to reduce the reception performance of the B-band signal when the a-band signal is transmitted, and when the antenna isolation of the duplexer 54 or the antenna isolation of the single-band antenna 60 cannot be optimized continuously, the following processing is performed according to the interference types. (1) If the interference type is dominant wave interference, it needs to be processed at the receiving end (i.e. the second receiving link), and a filter is used to filter out the dominant wave signal in the a band. Taking the dual-band antenna 50 as an example, if it is determined that the LNA511 blocks when the B-band signal enters the LNA511, a Filter1 (i.e., the first Filter described in the above embodiment) may be added before the LNA511, so as to obtain the first receiving chain 55 as shown in fig. 7A, and a Filter1 is added to the input of the LNA 511. But the filter insertion at this time may deteriorate the noise figure of the first receiving link 55; for a single frequency antenna 60, a Filter1 is applied at the input of LNA 631; if it is determined that the B-band signal enters the LNA511 without blocking the LNA511, then a Filter2 (i.e., the second Filter described in the above embodiments) may be added after the LNA (before RFIC) to obtain the third receive chain 56, as shown in fig. 7B, where a Filter2 is added at the output of the LNA511 and a Filter2 is added at the output of the LNA631 for the single-frequency antenna 60. (2) If the interference type is spurious interference, processing is required at the transmitting end (i.e. the second transmission link), and a filter is used for filtering spurious signals outside the main wave of the A frequency band. First, the position where the spurious signal is generated needs to be determined, taking the dual-band antenna 50 as an example, if the spurious signal is generated by the PA 521, a Filter3 (i.e., a third Filter described in the above embodiment) may be added after the PA 521 to obtain the first transmit chain 57, and as shown in fig. 7C, a Filter3 is added at the output end of the PA 521; similarly, for a single frequency antenna 60, Filter3 needs to be added at the output of PA 621; if the spurious signal is generated by RFIC 53, Filter4 (i.e., the fourth Filter described in the above embodiments) may be added before PA 521 (after RFIC 53) to obtain the first transmit chain 58, as shown in fig. 7D, and Filter2 may be added at the input of PA 521, which may not affect the transmit power of antenna 50, and similarly, for single frequency antenna 60, Filter2 may be added at the input of PA 621.

In the embodiment of the invention, a method for eliminating coexistence interference is provided, and the method can solve the interference problem on the premise of having minimum influence on performance by analyzing and judging the source and the type of multi-band interference and adopting corresponding solving measures according to different judgment results, thereby improving the development efficiency of products and reducing the product cost.

In general, for a model using the dual-band antenna 50, fig. 8 is a test topology structure diagram of the dual-band antenna 50, and the test topology shown in fig. 8 can be used to test the receiving sensitivity of the dual-band antenna 50 before and after adding a filter, while transmitting an a-band signal and receiving a B-band signal, and in order to test the receiving sensitivity of the B-band signal more accurately, the test can be performed in a signal shielding room. As shown in fig. 8, the test topology 80 of the dual-band antenna includes a first computer 81, a dual-band antenna module 82, a test instrument 83, and a second computer 84; wherein,

the test instrument 83 is configured to generate a B-band signal, and output the B-band signal to the duplex antenna port 821 on the dual-band antenna module 82 through the cable 831;

the second computer 84 is connected to the test instrument 83 through a network cable 841, and is configured to control the transmission state and the transmission power of the B-band signal.

The first computer 81 is connected with the dual-frequency antenna module 82 through a network cable 811, and is used for testing the receiving sensitivity of the dual-frequency antenna module 82 when receiving the B-band signal and controlling the transmitting power of the dual-frequency antenna module 82 when transmitting the a-band signal and transmitting the a-band signal;

the dual-band antenna module 82 receives the B-band signal and transmits the processed a-band signal through the duplex antenna port 821;

it should be noted that the a-band signal is generated by the dual-band antenna module 82, and the B-band signal is generated by the test instrument 83.

For a model using a single-frequency antenna, a test topology thereof is shown in fig. 9, where the test topology 90 includes: a first computer 91, a single-frequency antenna module 92, a radio frequency combiner 93, a programmable attenuator 94, a test instrument 95, and a second computer 96; wherein,

the test instrument 95 is used for generating a B-band signal and outputting the B-band signal to the radio frequency combiner 93 through the cable 951;

the second computer 96 is connected to the test instrument 95 through a network cable 961, and is configured to control the transmission state and the transmission power of the B-band signal;

in addition, the second computer 96 is further connected to the programmable attenuator 94 through the serial port 962, and is configured to control an attenuation coefficient of the programmable attenuator 94, so that when the a-band signal processed by the single-frequency antenna module 92 is coupled to the B-band signal through the programmable attenuator 94, the cable 941, and the radio frequency combiner 93 and enters the second antenna port 922, the second antenna port 922 and the first antenna port 921 are equivalent to the isolation between the two antenna ports;

the first computer 91 is connected to the single-frequency antenna module 92 through the network cable 911, and is configured to test the receiving sensitivity of the single-frequency antenna module 92 when receiving the B-band signal, and control the transmitting power of the single-frequency antenna module 92 when transmitting the a-band signal and transmitting the a-band signal;

the single-frequency antenna module 92 comprises a first antenna port 921 and a second antenna port 922, wherein the first antenna port 921 is connected with the programmable attenuator 94 and is used for transmitting the a-band signal processed by the single-frequency antenna module 92; the second antenna port 922 is configured to receive the signal processed by the radio frequency combiner 93 through the cable 931 and the radio frequency combiner 93;

through the two test topological structures, the difference value between the transmitting power of the A frequency band signal and the preset maximum power when the receiving sensitivity is reduced by 1dB can be tested, and the smaller the difference value is, the better the receiving performance of the currently tested double-frequency antenna module or single-frequency antenna module is. Therefore, if the difference between the transmitting power of the a band signal and the preset maximum power reaches the preset threshold when the receiving sensitivity decreases by 1dB, it indicates that the currently tested dual-band antenna module or single-band antenna module can eliminate the receiving interference of the a band signal to the B band signal.

An embodiment of the present invention provides a terminal, where the terminal includes the circuit for eliminating coexistence interference according to any one of the above embodiments.

It should be noted that the terminal may include a mobile terminal such as a mobile phone, a tablet computer, a notebook computer, a palm top computer, a Personal Digital Assistant (PDA), a Portable Media Player (PMP), a navigation device, a wearable device, a smart band, a pedometer, and a fixed terminal such as a Digital TV, a desktop computer, and the like.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method for canceling coexistence interference, the method comprising:

receiving a first receiving signal at a first receiving link, and transmitting a first transmitting signal output by a Radio Frequency Integrated Circuit (RFIC) shared by the first receiving link and the first transmitting link at a first transmitting link; wherein the first receive chain comprises a first filter and a Low Noise Amplifier (LNA);

2. The method of claim 1, further comprising:

inputting the first receive signal to a Low Noise Amplifier (LNA) in a second receive chain; wherein the second receive chain comprises a Low Noise Amplifier (LNA); the second receiving chain and the second transmitting chain share a Radio Frequency Integrated Circuit (RFIC); the second transmit chain comprises a Power Amplifier (PA);

if the LNA on the second receiving link is blocked, the first filter is added before the LNA of the second receiving link to obtain the first receiving link, so that the first receiving signal is filtered by the first filter and then input to the LNA and the RFIC.

3. The method of claim 2, further comprising:

determining that the LNA is blocked if the reception sensitivity of an RFIC shared by the second receive chain and the second transmit chain is less than a preset first threshold.

4. The method of claim 3, further comprising:

inputting the first receiving signal into an LNA of the second receiving chain to obtain a third receiving signal;

inputting the third receiving signal into an RFIC shared by the second receiving chain and the second transmitting chain, so as to obtain a fourth receiving signal;

determining a receive sensitivity of an RFIC common to the second receive chain and the second transmit chain from the fourth receive signal.

5. The method according to any of claims 1 to 4, wherein the first transmit chain comprises a Power Amplifier (PA) and a third filter, wherein the method further comprises:

performing power amplification on a first transmission signal output by the RFIC by using a Power Amplifier (PA) on the first transmission link to obtain a second transmission signal;

and inputting the second transmission signal into the third filter to filter the spurious signal generated by the PA to obtain a third transmission signal.

6. The method of claim 5, further comprising:

inputting a first sending signal output by a Radio Frequency Integrated Circuit (RFIC) shared by a second receiving link and a second transmitting link to a Power Amplifier (PA) on the second transmitting link to obtain a fourth sending signal; wherein the second transmit chain comprises a Power Amplifier (PA);

if the fourth transmission signal has a spurious signal, the third filter is added after the PA on the second transmission link to obtain the first transmission link, so that the fourth transmission signal is filtered by the third filter to filter the spurious signal generated by the PA.

7. The method according to any of claims 1 to 4, wherein the first transmit chain comprises a Power Amplifier (PA) and a fourth filter, wherein the method further comprises:

filtering the first transmission signal output by the RFIC by using a fourth filter on the first transmission link to filter stray signals generated by the RFIC to obtain a fifth transmission signal;

and inputting the fifth transmission signal to the PA to obtain a sixth transmission signal.

8. The method of claim 7, further comprising:

if a first transmission signal output by a Radio Frequency Integrated Circuit (RFIC) shared by a second receiving link and a second transmitting link contains a spurious signal, the fourth filter is added before the PA on the second transmitting link and after the RFIC to obtain the first transmitting link, so that the first transmission signal is filtered by the fourth filter to filter the spurious signal generated by the RFIC and then input to the PA.

9. A method for canceling coexistence interference, the method comprising:

10. The method of claim 9, further comprising:

if the LNA on the second receiving link is not blocked, the second filter is added after the LNA of the second receiving link and before the RFIC to obtain the third receiving link, so that the first receiving signal is amplified by the LNA and then input to the second filter and the RFIC.

11. The method of claim 10, further comprising:

12. A circuit for canceling coexistence interference, the circuit comprising: a first receive chain, a first transmit chain, a Radio Frequency Integrated Circuit (RFIC) common to the first receive chain and the first transmit chain; wherein the first receive chain comprises a first filter and a Low Noise Amplifier (LNA);

the first receiving chain is used for receiving a first receiving signal;

13. The circuit of claim 12, wherein the first transmit chain comprises a Power Amplifier (PA) and a third filter; wherein,

the PA is used for carrying out power amplification on a first sending signal output by the RFIC to obtain a second sending signal;

and the third filter is used for filtering the second transmission signal to filter stray signals generated by the PA so as to obtain a third transmission signal.

14. The circuit of claim 12, wherein the first transmit chain comprises a Power Amplifier (PA) and a fourth filter; wherein,

the fourth filter is configured to filter the first transmission signal output by the RFIC to filter stray signals generated by the RFIC, so as to obtain a fifth transmission signal;

and the PA is used for carrying out power amplification on the fifth sending signal to obtain a sixth sending signal.

15. A circuit for canceling coexistence interference, the circuit comprising: a Radio Frequency Integrated Circuit (RFIC) shared by a third receive chain, a first transmit chain, the third receive chain and the first transmit chain; wherein the third receive chain comprises a Low Noise Amplifier (LNA) and a second filter;

the third receiving chain is used for receiving a first receiving signal;

16. A terminal, characterized in that it comprises a circuit for cancelling coexistence interference according to any one of claims 12 to 15.