CN104378138A - Method and device for suppressing radio-frequency mutual interference and multi-mode and multi-standby communication terminal - Google Patents
Method and device for suppressing radio-frequency mutual interference and multi-mode and multi-standby communication terminal Download PDFInfo
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Abstract
The invention discloses a method and device for suppressing radio-frequency mutual interference and a multi-mode and multi-standby communication terminal. The device comprises radio frequency transceivers, a communication processor and a radio frequency suppressor. The communication processor is used for processing transmitted signals of the radio frequency transceivers working in parallel through the radio frequency suppressor and then transmitting the transmitted signals to an antenna when detecting that adjacent working frequency bands exist between the radio frequency transceivers working in parallel; the radio frequency suppressor is used for suppressing interference signals generated by the transmitted signals of the radio frequency transceivers working in parallel. When the radio frequency transceivers with the adjacent transmitting frequency bands and receiving frequency bands work at the same time, the transmitted signals of the radio frequency transceivers working at the same time are suppressed, the interference signals generated by the transmitted signals are reduced or eliminated, and therefore normal working of the radio frequency transceivers working at the same is easily and effectively guaranteed.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for suppressing radio frequency mutual interference, and a multimode multi-standby communication terminal.
Background
With the worldwide expansion of the fourth Generation mobile communication technology (4G), multi-mode multi-standby communication terminals have become a major requirement of network operators and are becoming more and more popular with users.
The multimode multi-standby Communication terminal brings convenience to users and also increases difficulty for technical implementation, and when the multimode multi-standby Communication terminal is in a standby state in multiple modes, a problem of mutual interference between a transmitter and a receiver is generated, wherein out-of-band interference (stray interference and blocking interference) is relatively common interference, and relatively obvious mutual interference occurs between a Global System for Mobile Communication (GSM) frequency band of a Distributed Control System (DCS) and a B34 frequency band of a Time Division Synchronous Code Division Multiple Access (TDSCDMA), a Wireless Fidelity (WiFi) frequency band and a B40 frequency band of a Long Term Evolution (Long Term Evolution, LTE) technology.
The prior art mainly includes the following schemes: 1. increasing the antenna isolation to above 20 dB; 2. the transmission frequency band is added with a band elimination filter (wave trap), such as: performing band-elimination filtering on transmission signals of frequency bands of B39, B40, wireless local Area Networks (WLAN for short) and the like; 3. adding a narrow-band filter to a receiving frequency band, such as: and carrying out narrow-band filtering on the received signals of DCS1800, B40, WLAN and other frequency bands. The principle of the conventional rf cross-interference suppression is shown in fig. 1. In fig. 1, PA is a power amplifier; the TRX is a receiving and transmitting unit and comprises a transmitter and a receiver; FILTER is a FILTER; the CPU is a processor.
However, the above mutual interference suppression schemes are difficult to implement. The mutual interference is reduced by increasing the isolation of the antenna, and if the antenna needs to ensure the performance of Over-the-Air Technology (OTA for short), the antenna is difficult to achieve higher isolation, so the interference cannot be completely eliminated, and meanwhile, the radiation resistance of the antenna also has adverse effects on radiation stray. Increase trapper (band elimination filter) at the PA output, can effectively restrain the outband spurious that the interference source transmitter produced to, increase narrow band filter at the receiving frequency channel, when there is mutual interference, make received signal get into narrow band filter, can effectively restrain outband spurious interference to received signal, however, the device integrated level that uses at present is higher and higher, and the PA has generally been used with the integrated condition together of antenna switch, and this increase that just makes trapper and narrow band filter has received very big restriction.
Disclosure of Invention
The invention mainly aims to provide a method and a device for inhibiting radio frequency mutual interference and a multi-mode multi-standby communication terminal, so as to solve the problem of high difficulty in realizing the existing mutual interference inhibition scheme.
Based on the technical problems, the invention is solved by the following technical scheme.
The invention provides a device for inhibiting radio frequency mutual interference, which comprises a radio frequency transceiver, a communication processor and a radio frequency inhibitor, wherein the radio frequency transceiver is connected with the communication processor; the communication processor is used for processing the transmission signals of the parallel working radio frequency transceivers through the radio frequency suppressor and then transmitting the processed transmission signals to the antenna under the condition that adjacent working frequency bands exist between the parallel working radio frequency transceivers; the radio frequency suppressor is used for suppressing interference signals generated by the transmission signals of the radio frequency transceivers working in parallel.
Wherein the communication processor is further configured to: and under the condition that adjacent working frequency bands exist between the parallel working radio frequency transceivers are not detected, transmitting signals of the parallel working radio frequency transceivers are directly transmitted to an antenna.
Wherein the apparatus further comprises: and the double-throw switch is used for communicating the radio frequency transceiver with the radio frequency suppressor or communicating the radio frequency transceiver with the antenna under the control of the communication processor.
Wherein the radio frequency suppressor comprises: a band-stop filter; alternatively, the radio frequency suppressor comprises: band pass filters and band reject filters.
The working frequency band of the radio frequency transceiver comprises a transmitting frequency band and a receiving frequency band; the adjacent working frequency bands are: in the parallel operating rf transceivers, the transmit signal in the transmit band of one rf transceiver, or the intermodulation signal of the transmit signal, falls directly into the receive band or transition band of another rf transceiver.
The invention also provides a method for inhibiting radio frequency mutual interference, which comprises the following steps: detecting the working frequency range of the radio frequency transceivers working in parallel; if adjacent working frequency bands exist between the parallel working radio frequency transceivers, firstly suppressing interference signals generated by the transmission signals of the parallel working radio frequency transceivers, and then transmitting the transmission signals of the parallel working radio frequency transceivers to an antenna.
Wherein the method further comprises: and if the adjacent working frequency bands are not detected to exist between the parallel working radio frequency transceivers, controlling the transmission signals of the parallel working radio frequency transceivers to be directly transmitted to the antenna.
Wherein suppressing an interference signal generated by a transmission signal of the parallel operating radio frequency transceivers comprises: and suppressing interference signals generated by the transmitting signals of the radio frequency transceivers working in parallel by a band-stop filter or a band-pass filter and a band-stop filter simultaneously.
The working frequency band of the radio frequency transceiver comprises a transmitting frequency band and a receiving frequency band; the adjacent working frequency bands are: in the parallel operating rf transceivers, the transmit signal in the transmit band of one rf transceiver, or the intermodulation signal of the transmit signal, falls directly into the receive band or transition band of another rf transceiver.
The invention also provides a multimode multi-standby communication terminal which comprises the device for inhibiting radio frequency mutual interference.
The invention has the following beneficial effects:
when the radio frequency transceivers adjacent to the transmitting frequency band and the receiving frequency band work simultaneously, the invention inhibits the transmitting signals of the radio frequency transceivers working simultaneously, reduces or eliminates the interference signals generated by the transmitting signals, thereby simply and effectively ensuring the normal work of the radio frequency transceivers working simultaneously.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of conventional RF cross-interference suppression;
FIG. 2 is a block diagram of an apparatus for suppressing RF cross talk in accordance with an embodiment of the present invention;
fig. 3 is a detailed block diagram of an apparatus for suppressing rf cross talk according to an embodiment of the present invention;
fig. 4 is a detailed block diagram of an apparatus for suppressing rf cross talk according to another embodiment of the present invention;
fig. 5 is a flow chart of a method of suppressing rf cross talk according to an embodiment of the invention.
Detailed Description
The multimode multi-standby communication terminal means that the same terminal has multiple communication systems, and each communication system is called a mode. Each communication system comprises a corresponding transmitting frequency band and a corresponding receiving frequency band, and each communication system correspondingly uses a radio frequency transceiver to realize the transceiving of communication signals. The radio frequency transceiver includes a receiver and a transmitter, or a transceiving device integrating the receiver and the transmitter is used as the radio frequency transceiver. The receiver is used for receiving signals belonging to the receiving frequency range; the transmitter is used for transmitting signals belonging to a transmission frequency range.
The main idea of the invention is that: when two adjacent radio frequency transceivers of the transmitting frequency band and the receiving frequency band work simultaneously (double-pass), the transmitting signals of the two radio frequency transceivers are inhibited, and the interference of the transmitting signals transmitted in the adjacent transmitting frequency band and the adjacent receiving frequency band on the receiving signals and the interference between the transmitting signals of the two radio frequency transceivers are reduced or eliminated, so that the normal work of the two radio frequency transceivers is simply and effectively ensured. The transmitting frequency bands and the receiving frequency bands of the two radio frequency transceivers are adjacent, namely the working frequency bands of the two radio frequency transceivers are adjacent, and the adjacent judgment basis is as follows: the transmission signal of one radio frequency transceiver or the interference signal generated by the transmission signal falls into the receiving frequency band or the transition frequency band of another radio frequency transceiver, thereby causing interference to the signal transmitted in the receiving frequency band. The interference signal includes an intermodulation signal, a spurious signal, and the like.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
According to an embodiment of the present invention, there is provided an apparatus for suppressing mutual radio frequency interference. As shown in fig. 2, fig. 2 is a block diagram of an apparatus for suppressing rf crosstalk according to an embodiment of the present invention.
The device includes: radio frequency transceiver, communication processor, radio frequency suppressor, front end module, double throw switch.
And the radio frequency transceiver is used for transmitting signals and receiving signals according to the selected working frequency band. Furthermore, the radio frequency transceiver comprises a plurality of working frequencies, and when the radio frequency transceiver works, the working frequency band with the strongest signal is selected to receive and transmit signals.
The communication processor is used for detecting the working frequency band of the parallel working radio frequency transceivers; if the adjacent working frequency bands exist between the parallel working radio frequency transceivers, transmitting signals of the parallel working radio frequency transceivers are processed by the radio frequency suppressor and then transmitted to the antenna; and if the adjacent working frequency bands are not detected to exist between the parallel working radio frequency transceivers, directly transmitting the transmitting signals of the parallel working radio frequency transceivers to the antenna. Further, the communication processor may control the double-throw switch to control whether the transmission signal passes through the rf suppressor, in other words, the double-throw switch communicates the rf transceiver with the rf suppressor or communicates the rf transceiver with the antenna under the control of the communication processor.
And the radio frequency suppressor is used for suppressing interference signals generated by the transmission signals of the radio frequency transceivers working in parallel. Further, the rf suppressor is mainly used for suppressing interference of a transmission signal transmitted in an adjacent operating frequency band with a reception signal transmitted in the adjacent operating frequency band. The radio frequency suppressor comprises a band-stop filter, or comprises a band-pass filter and a band-stop filter. Preferably, the radio frequency suppressor comprises a band pass filter and a band reject filter. The band-pass filter is used for suppressing out-of-band spurious signals, and the band-stop filter is used for suppressing in-band spurious signals.
In this embodiment, the apparatus for suppressing rf mutual interference further includes: and the front-end module is used for amplifying the transmitting signal of the radio frequency transceiver and transmitting the amplified transmitting signal to the radio frequency suppressor or the antenna under the control of the communication processor.
In this embodiment, narrow-band filtering or band-pass filtering is required for the received signal. When the radio frequency transceivers adjacent to the receiving frequency band and the transmitting frequency band work simultaneously, the narrow-band filtering needs to be carried out on the receiving frequency band to enable the receiving frequency band to work in a narrow band, so that the interval between the adjacent receiving frequency band and the transmitting frequency band is increased, and the interference of the transmitting frequency band to the receiving frequency band is reduced. When the radio frequency transceivers adjacent to the receiving frequency band and the transmitting frequency band do not work simultaneously, only the band-pass filtering is carried out on the receiving frequency band to filter out the out-of-band interference signals of the receiving frequency band.
Specifically, the operating frequency band of the radio frequency transceiver includes a transmitting frequency band and a receiving frequency band, and the radio frequency transceiver transmits signals in the transmitting frequency band and receives signals in the receiving frequency band.
The adjacent working frequency bands refer to: in the parallel operating rf transceivers, the transmit signal in the transmit band of one rf transceiver, or the intermodulation signal of the transmit signal, falls directly into the receive band or transition band of another rf transceiver. Thus, the transmission signal or the intermodulation signal of the transmission signal causes interference to the reception signal in the reception frequency band.
Interference is classified by frequency including:
1. co-channel interference: the signal transmitted by the interference source directly falls into the frequency band received by the interference source. For example: GSM900TX (880- > 915MHz) interferes with CDMA BC0RX (869- > 894 MHz).
2. Transition zone interference: the interference source transmitting signal falls into the transition frequency band of the interfered source filter. For example: LTE B39TX (1880-1920MHz) interferes with DCS1800RX (1805-1880 MHz); the LTEB40(2300 + 2400MHz) interferes with the BT/WLAN (2400 + 2485 MHz).
3. Stray interference: the spurious signals of the signals transmitted by the interference source fall into the frequency band received by the interference source.
In the process of receiving and transmitting signals, the radio frequency transceivers which work in parallel and have adjacent working frequency bands generate interference between the transmitting frequency band and the transmitting frequency band, and the transmitting frequency band in the adjacent working frequency bands can also cause interference to the adjacent receiving frequency bands. Therefore, the embodiment employs the radio frequency suppressor to suppress the transmission signal in the transmission frequency band, and prevents the interference signal generated by the radio frequency suppressor from causing interference to other transmission or reception signals.
Two specific examples are given below to describe the present invention.
In a first embodiment, as shown in fig. 3, fig. 3 is a schematic structural diagram of an apparatus for suppressing rf cross talk according to an embodiment of the present invention.
In this embodiment, the apparatus for suppressing rf mutual interference includes: a communication processor CPU, a first radio frequency Transceiver Transceiver1, a second radio frequency Transceiver Transceiver 2; the filter bank 1, the front-end module 1, the double-throw switch 1, the radio frequency suppressor A and the antenna 1 are correspondingly arranged for the Transceiver 1; the filter bank 2, the front end module 2, the double-throw switch 2, the radio frequency suppressor D and the antenna 2 are correspondingly arranged for the Transceiver 2.
Transceiver1 includes 3 operating bands, Band A, Band B and Band C. Transceiver2 includes 3 operating bands, Band D, Band E and Band F. Wherein, Band A in Transceiver1 and Band D in Transceiver2 are adjacent working frequency bands, and the transmitting frequency Band of Band A is adjacent to the receiving frequency Band of Band D.
The filter bank 1 includes: band-pass filter a set for Band a, Band-pass filter B set for Band B, and Band-pass filter C set for Band C.
The filter bank 2 includes: a Band pass filter D set for Band D, a Band pass filter E set for Band E, and a Band pass filter F set for Band F. The filter bank 2 further includes a narrow Band filter D correspondingly configured for Band D.
The front-end module 1 and the front-end module 2 each include a power amplifier PA and an antenna switch. The power amplifier PA is used for amplifying a transmission signal; the antenna switch is used for distinguishing the frequency band of the received signal and transmitting the received signal to a band-pass filter or a narrow-band filter corresponding to the frequency band in the filter bank under the control of the CPU. When interference exists between the working frequency bands, the antenna switch transmits the received signals in the adjacent working frequency bands to the narrow-band filter, and when interference does not exist between the working frequency bands, the antenna switch transmits the received signals to the band-pass filter. Since, in the first embodiment, only Band a and Band D have interference, only the narrow Band filter a corresponding to Band a is provided in the filter bank 1, and only the narrow Band filter D corresponding to Band D is provided in the filter bank 2.
The radio frequency suppressor A and the radio frequency suppressor D both comprise a band-stop filter and a band-pass filter.
The DPDT1 includes 4 contacts, RF1 connected to front end module 1, RF2 connected to the output of RF suppressor a, RF3 connected to the input of RF suppressor a, and RF4 connected to antenna 1.
The DPDT2 includes 4 contacts, RF1 connected to the front end module 2, RF2 connected to the output of the RF suppressor D, RF3 connected to the input of the RF suppressor D, and RF4 connected to the antenna 2.
According to the first embodiment, the procedure of transmitting and receiving signals will be described.
In the case of single pass, that is, when Band a in Transceiver1 and Band D in Transceiver2 do not operate simultaneously. The two radio frequency transceivers of the adjacent working frequency bands do not have the mutual interference problem. The CPU controls the DPDT switches corresponding to the Transceiver1 and the Transceiver2 respectively, so that the connection modes of the switches in the DPDT1 and the DPDT2 are as follows: RF1 is connected to RF4 and RF2 is connected to RF3 so that front end module 1 and front end module 2 are both directly connected to the antenna, which reduces signal power consumption and insertion loss, while RF suppressors a and D are both inactive. For example: the Transceiver1 works with Band A, when in signaling, the Transceiver transmits signals in the transmission frequency Band of Band A, the transmitted signals reach the antenna 1 through the front-end module 1 and the DPDT1(RF1 is connected with RF4), and the transmitted signals are transmitted through the antenna 1; when receiving a signal, the antenna 1 receives the signal, the received signal reaches the front-end module 1 through the DPDT1(RF1 is connected to RF4), the antenna switch in the front-end module 1 analyzes that the received signal is in a receiving frequency Band of Band a, the received signal is sent to the Band-pass filter a in the filter bank 1 under the control of the CPU to perform Band-pass filtering on the received signal, and the received signal after the Band-pass filtering is transmitted to the Transceiver 1.
In the double pass, that is, the Band a in Transceiver1 and the Band D in Transceiver2 operate simultaneously. The transmitting frequency Band of Band A in Transceiver1 is adjacent to the receiving frequency Band of Band D in Transceiver2, and the mutual interference problem exists between Transceiver1 and Transceiver 2.
When the signal is transmitted in a double-pass mode, the CPU controls the double-throw switch, so that the radio frequency suppressor A and the radio frequency suppressor D both participate in interference suppression of the transmitted signal. When the Transceiver1 transmits a signal, the signal transmitted by the Transceiver1 is amplified by the front-end module 1, and then reaches the RF suppressor a through the DPDT1(RF1 is connected to RF3) to perform interference suppression, and the signal transmitted after the interference suppression reaches the antenna 1 through the DPDT1(RF2 is connected to RF 4). When the Transceiver2 transmits a signal, the signal transmitted by the Transceiver2 is amplified by the front-end module 2, and then reaches the RF suppressor D through the DPDT2(RF1 is connected to RF3) to perform interference suppression, and the signal transmitted after the interference suppression reaches the antenna 2 through the DPDT2(RF2 is connected to RF 4).
When receiving signals in a double-pass mode, the CPU controls the double-throw switch, so that the radio frequency suppressor A and the radio frequency suppressor D do not participate in receiving and transmitting signals. When the Transceiver1 receives a signal, the received signal received by the antenna 1 reaches the front-end module 1 through the DPDT1(RF4 is connected to RF1), the front-end module 1 analyzes the frequency Band to which the received signal belongs, and if the received signal belongs to Band a, the received signal is transmitted to the Band-pass filter a under the control of the CPU, and the received signal after Band-pass filtering is transmitted to the Transceiver1 by the Band-pass filter a. When the Transceiver2 receives a signal, the received signal received by the antenna 2 reaches the front-end module 2 through DPDT2(RF4 is connected to RF1), the front-end module 2 analyzes the frequency Band to which the received signal belongs, and if the received signal belongs to Band D, the received signal is transmitted to the narrow-Band filter D under the control of the CPU, and the received signal after narrow-Band filtering is transmitted to the Transceiver2 by the narrow-Band filter D. Because Band D and Band A are adjacent, and a receiving signal in Band D can be interfered by a transmitting signal in Band A, the Band D is enabled to work in a narrow Band, a certain interval exists between the Band D and the Band A, and the Band D and the Band A are not adjacent to each other in a working frequency Band, so that the purpose of suppressing interference is achieved.
Under the condition of single pass or double pass, because the Band B, the Band C, the Band E and the Band F do not have adjacent operating frequency bands, when the Band B, the Band C, the Band E and the Band F are in operation, no matter a transmitting signal or a receiving signal, the CPU controls the connection mode of the double-throw switch to be that RF1 is connected with RF4, RF2 is connected with RF3, and the radio frequency suppressor does not work.
Second embodiment, as shown in fig. 4, fig. 4 is a specific structural diagram of an apparatus for suppressing rf crosstalk according to another embodiment of the present invention.
In the second embodiment, in addition to the adjacent operating bands of Band a of Transceiver1 and Band D of Transceiver2, Band B of Transceiver1 and Band E of Transceiver2 are also adjacent operating bands, and the receiving Band of Band B is adjacent to the transmitting Band of Band E, so in the second embodiment, on the basis of the structure of the first embodiment, a corresponding narrow Band filter B and a corresponding radio frequency suppressor B are provided for Band B of Transceiver1, and a corresponding radio frequency suppressor E is provided for Band E of Transceiver 2.
DPDT1 includes 6 contacts, RF1 connected to front end module 1, RF2 connected to the output of RF suppressor B, RF3 connected to the output of RF suppressor a, RF4 connected to the input of RF suppressor a, RF5 connected to the input of RF suppressor B, and RF6 connected to antenna 1.
DPDT2 includes 6 contacts, RF1 connected to front end module 2, RF2 connected to the output of RF suppressor E, RF3 connected to the output of RF suppressor D, RF4 connected to the input of RF suppressor D, RF5 connected to the input of RF suppressor E, and RF6 connected to antenna 2.
The procedure of transmitting and receiving signals will be described with the configuration of the second embodiment.
In the case of single pass, that is, when Band a in Transceiver1 and Band D in Transceiver2 do not operate simultaneously, Band B in Transceiver1 and Band E in Transceiver2 do not operate simultaneously. The two radio frequency transceivers of the adjacent working frequency bands do not have the mutual interference problem. In single-pass operation, similar to the process of the first embodiment, the CPU controls the DPDT switches corresponding to the transmitter 1 and the transmitter 2, so that the connection modes of the switches in the DPDT1 and the DPDT2 are as follows: RF1 and RF6 connections, RF2 and RF5 connections, and RF3 and RF4 connections, so that front-end module 1 and front-end module 2 are both directly connected to the antenna, while RF suppressor a, RF suppressor B, RF suppressor D and RF suppressor E are not active. For example: the Transceiver1 works with Band B, when in signaling, the Transceiver transmits signals in the transmission frequency Band of Band B, and the transmitted signals reach the antenna 1 through the front-end module 1 and the DPDT1(RF1 is connected with RF6) and are transmitted through the antenna 1; when receiving a signal, the antenna 1 receives the signal, the received signal reaches the front-end module 1 through the DPDT1(RF1 is connected to RF6), the antenna switch in the front-end module 1 analyzes that the received signal is in a receiving frequency Band of Band B, the received signal is sent to the Band-pass filter B in the filter bank 1 under the control of the CPU to perform Band-pass filtering on the received signal, and the received signal after the Band-pass filtering is transmitted to the Transceiver 1.
In the double pass, that is, when Band a in Transceiver1 and Band D in Transceiver2 operate simultaneously, or when Band B in Transceiver2 and Band E in Transceiver2 operate simultaneously. For the case that Band a in Transceiver1 and Band D in Transceiver2 operate simultaneously, refer to the first embodiment, and are not described herein. The following describes a case where Band B in Transceiver2 and Band E in Transceiver2 operate simultaneously.
When the signal is transmitted in a double-pass mode, the CPU controls the double-throw switch, so that the radio frequency suppressor B and the radio frequency suppressor E both participate in interference suppression of the transmitted signal. The CPU controls the double-throw switch corresponding to the radio frequency transceiver for transmitting signals, and the connection mode of the double-throw switch is that RF1 is connected with RF5, and RF2 is connected with RF 6. When the Transceiver1 transmits a signal, the transmit signal of the Transceiver1 is transmitted to the front-end module 1, the transmit signal amplified by the front-end module 1 reaches the RF suppressor B through the DPDT1(RF1 is connected to RF5), and the transmit signal after interference suppression reaches the antenna 1 through the DPDT1(RF2 is connected to RF 6). When the Transceiver2 transmits a signal, the signal transmitted by the Transceiver2 is amplified by the front-end module 2, and then reaches the RF suppressor E through the DPDT2(RF1 is connected to RF5), and the signal transmitted after interference suppression reaches the antenna 2 through the DPDT2(RF2 is connected to RF 6).
When receiving signals in a double-pass mode, the CPU controls the double-throw switch, so that the radio frequency suppressor B and the radio frequency suppressor E do not participate in receiving and transmitting signals. When Transceiver1 receives a signal, the received signal received by antenna 1 reaches front end module 1 through DPDT1(RF6 is connected to RF1), front end module 1 analyzes the frequency Band to which the received signal belongs, and if it belongs to Band B, the received signal is transmitted to narrow Band filter B, and the narrow Band filtered received signal is transmitted to Transceiver 1. When the Transceiver2 receives a signal, the received signal received by the antenna 2 reaches the front-end module 2 through DPDT2(RF6 is connected to RF1), the front-end module 2 analyzes the frequency Band to which the received signal belongs, and if it belongs to Band E, the received signal is transmitted to the Band-pass filter E under the control of the CPU, and the Band-pass filtered received signal is transmitted to the Transceiver 2.
The invention also provides a multimode multi-standby communication terminal which comprises a plurality of communication modes and the device for inhibiting radio frequency mutual interference.
The device for inhibiting radio frequency mutual interference can effectively reduce or eliminate the interference among a plurality of communication systems in the multi-mode multi-standby communication terminal, and can control the signal path through the double-throw switch, thereby being simple to realize. In a multimode multi-standby communication terminal with higher integration level, the signal interference can be reduced, the performance of a radio frequency transceiver can be improved, and the communication quality can be improved.
The invention also provides a method for inhibiting radio frequency mutual interference. As shown in fig. 5, fig. 5 is a flowchart of a method for suppressing rf cross talk according to an embodiment of the invention.
Step S510, detecting the operating frequency band of the rf transceivers operating in parallel.
The operating frequency band of each radio frequency transceiver includes a transmit frequency band and a receive frequency band.
Step S520, determine whether there is an adjacent operating frequency band between the parallel operating rf transceivers. If yes, go to step S530; if not, go to step S540.
The operating frequency band of the radio frequency transceiver includes a transmitting frequency band and a receiving frequency band.
The adjacent working frequency bands are: in the parallel operating rf transceivers, the transmitting frequency band of one rf transceiver falls within, is adjacent to or within a predetermined range of the receiving frequency band of another rf transceiver.
Step S530, suppressing an interference signal generated by a transmission signal of the parallel operating radio frequency transceivers. After that, step S540 is performed.
In the parallel operating radio frequency transceivers, the transmission signal sent by each radio frequency transceiver is subjected to interference suppression to suppress the interference of the transmission signal to other transmission signals and suppress the interference of the transmission signal to the receiving signal of the adjacent receiving frequency band.
And suppressing interference signals generated by the transmitting signals of the radio frequency transceivers working in parallel by a band-stop filter or a band-pass filter and a band-stop filter simultaneously.
For the received signal received by the radio frequency transceiver, the existing method can be adopted for receiving.
Step S540, transmitting the transmission signal transmitted in the adjacent working frequency band to the antenna.
If adjacent working frequency bands exist between the parallel working radio frequency transceivers, firstly suppressing interference signals generated by the transmission signals of the parallel working radio frequency transceivers, and then transmitting the transmission signals of the parallel working radio frequency transceivers to an antenna.
And if the adjacent working frequency bands are not detected to exist between the parallel working radio frequency transceivers, controlling the transmission signals of the parallel working radio frequency transceivers to be directly transmitted to the antenna.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A device for suppressing radio frequency mutual interference is characterized by comprising a radio frequency transceiver, a communication processor and a radio frequency suppressor;
the communication processor is used for processing the transmission signals of the parallel working radio frequency transceivers through the radio frequency suppressor and then transmitting the processed transmission signals to the antenna under the condition that adjacent working frequency bands exist between the parallel working radio frequency transceivers;
the radio frequency suppressor is used for suppressing interference signals generated by transmission signals of the radio frequency transceivers working in parallel.
2. The apparatus of claim 1, wherein the communication processor is further configured to:
and under the condition that adjacent working frequency bands exist between the parallel working radio frequency transceivers are not detected, transmitting signals of the parallel working radio frequency transceivers are directly transmitted to an antenna.
3. The apparatus of claim 2, further comprising:
and the double-throw switch is used for communicating the radio frequency transceiver with the radio frequency suppressor or communicating the radio frequency transceiver with the antenna under the control of the communication processor.
4. The apparatus of claim 1, 2 or 3,
the radio frequency suppressor comprises: a band-stop filter; or,
the radio frequency suppressor comprises: band pass filters and band reject filters.
5. The apparatus of claim 1, 2 or 3,
the operating frequency band of the radio frequency transceiver includes a transmitting frequency band and a receiving frequency band.
6. A method for suppressing rf cross talk, comprising:
detecting the working frequency range of the radio frequency transceivers working in parallel;
if adjacent working frequency bands exist between the parallel working radio frequency transceivers, firstly suppressing interference signals generated by the transmission signals of the parallel working radio frequency transceivers, and then transmitting the transmission signals of the parallel working radio frequency transceivers to an antenna.
7. The method of claim 6, further comprising:
and if the adjacent working frequency bands are not detected to exist between the parallel working radio frequency transceivers, controlling the transmission signals of the parallel working radio frequency transceivers to be directly transmitted to the antenna.
8. The method of claim 6 or 7, wherein suppressing the interference signal generated by the transmission signals of the parallel operating radio frequency transceivers comprises:
and suppressing interference signals generated by the transmitting signals of the radio frequency transceivers working in parallel by a band-stop filter or a band-pass filter and a band-stop filter simultaneously.
9. The method according to claim 6 or 7,
the operating frequency band of the radio frequency transceiver includes a transmitting frequency band and a receiving frequency band.
10. A multimode, multi-standby communication terminal, characterized in that it comprises the apparatus of any of claims 1-5.
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