CN113098535A - Communication device and method - Google Patents
Communication device and method Download PDFInfo
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- CN113098535A CN113098535A CN202110365414.4A CN202110365414A CN113098535A CN 113098535 A CN113098535 A CN 113098535A CN 202110365414 A CN202110365414 A CN 202110365414A CN 113098535 A CN113098535 A CN 113098535A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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Abstract
The application discloses a communication device and a method, wherein the device comprises: the device comprises a transmitting circuit, a receiving circuit, a first circulator and a second circulator; the input end of the transmitting circuit and the output end of the receiving circuit are connected to an antenna port of the terminal equipment through a first circulator; the output end of the transmitting circuit and the input end of the receiving circuit are connected to the antenna through a second circulator; the transmitting circuit is used for converting the public network frequency band uplink signal transmitted by the antenna port into a corresponding private network frequency band uplink signal; the receiving circuit is used for converting the received private network frequency band downlink signal sent by the base station into a corresponding public network frequency band downlink signal; the first circulator is used for transmitting the uplink signal of the public network frequency band to the transmitting circuit and transmitting the downlink signal of the public network frequency band to the antenna interface; the second circulator is used for sending the uplink signal of the private network frequency band to the base station through the antenna and receiving the downlink signal of the private network frequency band through the antenna. The technical scheme provided by the application can realize the private network communication of the non-private network terminal equipment.
Description
Technical Field
The present disclosure relates to the field of wireless communications, and more particularly, to a communication apparatus and method.
Background
Private network communication, i.e., private wireless network communication, is a professional network that provides secure and reliable wireless services for a specific department or group (such as government affairs and public security industries), and its basic network is generally independent of public mobile communication networks (public networks). At present, only specific private network terminal equipment is used for carrying out private network communication through a private network base station, non-private network terminal equipment in the market cannot carry out private network communication through the private network base station, and can only carry out public network communication through the public network base station.
Disclosure of Invention
In view of the foregoing problems in the prior art, an object of the present specification is to provide a communication apparatus and method, which implement a private network communication function of a non-private network terminal device through frequency band switching of signals.
In order to achieve the above purpose, the present specification provides the following solutions:
a communications apparatus, the apparatus comprising: the device comprises a transmitting circuit, a receiving circuit, a first circulator and a second circulator;
the input end of the transmitting circuit and the output end of the receiving circuit are connected to an antenna port of the terminal equipment through the first circulator;
the output end of the transmitting circuit and the input end of the receiving circuit are connected to an antenna through the second circulator;
the transmitting circuit is used for converting the public network frequency band uplink signal transmitted by the antenna port into a corresponding private network frequency band uplink signal;
the receiving circuit is used for converting the received private network frequency band downlink signal sent by the base station into a corresponding public network frequency band downlink signal;
the first circulator is configured to transmit the uplink signal of the public network frequency band to the transmitting circuit and transmit the downlink signal of the public network frequency band to the antenna interface;
and the second circulator is used for sending the uplink signal of the private network frequency band to the base station through the antenna and receiving the downlink signal of the private network frequency band through the antenna.
The application also discloses a communication method, which is realized based on the communication device, and the method comprises the following steps:
the first circulator transmits a public network frequency band uplink signal sent by an antenna port of the terminal equipment to a transmitting circuit;
the transmitting circuit carries out frequency band conversion on the public network frequency band uplink signal to obtain a private network frequency band uplink signal corresponding to the public network frequency band uplink signal;
the second circulator sends the uplink signal of the private network frequency band to a base station through an antenna;
the second circulator receives a private network frequency band downlink signal sent by the base station through the antenna and transmits the private network frequency band downlink signal to a receiving circuit;
the receiving circuit carries out frequency band conversion on the private network frequency band downlink signal to obtain a public network frequency band downlink signal corresponding to the private network frequency band downlink signal;
and the first circulator transmits the downlink signal of the public network frequency band to the antenna port.
Compared with the prior art, the method has obvious advantages and beneficial effects. By means of the technical scheme, the communication device and the communication method can achieve considerable technical progress and practicability, have wide industrial utilization value and have the following technical effects:
the technical scheme that this application provided can be with the public network frequency channel uplink signal frequency conversion that non-private network terminal equipment sent for the private network frequency channel uplink signal that private network basic station can receive and with the public network frequency channel downlink signal frequency conversion that private network terminal equipment sent for non-private network terminal equipment can receive, realizes the communication between non-private network terminal equipment and the private network basic station for private network communication is more high-efficient convenient.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of an application environment provided by an embodiment of the present application;
fig. 2 is a block diagram of a communication device according to an embodiment of the present disclosure;
fig. 3 is a block diagram of a transmitting circuit according to an embodiment of the present disclosure;
fig. 4 is a block diagram of another structure of a transmitting circuit according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a receiving circuit according to an embodiment of the present disclosure;
fig. 6 is a block diagram of a serial peripheral interface according to an embodiment of the present disclosure;
fig. 7 is a flowchart illustrating a communication method according to an embodiment of the present application;
fig. 8 is a flowchart illustrating a method for converting an uplink signal frequency band according to an embodiment of the present application;
fig. 9 is a schematic flowchart of an uplink signal processing method according to an embodiment of the present application;
fig. 10 is a flowchart illustrating a method for converting a downlink signal frequency band according to an embodiment of the present application;
fig. 11 is a flowchart illustrating a downlink signal processing method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the several embodiments provided in the present application, the described system embodiments are only illustrative, for example, the division of the above modules is only one logical function division, and there may be other division manners in actual implementation, for example, a plurality of modules or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of modules or units through some interfaces, and may be in an electrical or other form.
Referring to fig. 1, fig. 1 is a schematic diagram of an application environment according to an embodiment of the present application, and as shown in fig. 1, the application environment includes a terminal device side 01, a private network base station side 02, and a communication device 03. Specifically, the terminal device side 01 may include a mobile terminal of a smart phone, a desktop computer, a tablet computer, a notebook computer, a digital assistant, a smart wearable device, or the like; the private network base station side 02 may include a private mobile communication base station.
In practical application, the signal frequency band of the terminal device side 01 is a public network frequency band, and the signal frequency band of the private network base station side 02 is a private network frequency band. And the communication device 03 is used for completing the frequency band conversion of the signals between the terminal equipment side 01 and the private network base station side 02. Wherein, the signal sent from the terminal equipment side 01 to the private network base station side 02 is an uplink signal; the signal transmitted from the private network base station side 02 to the terminal device side 01 is a downlink signal.
The following describes a communication apparatus provided in an embodiment of the present application, and as shown in fig. 2, specifically, the apparatus may include: a transmission circuit 1, a reception circuit 2, a first circulator 3, and a second circulator 4;
an input terminal of the transmission circuit 1 and an output terminal of the reception circuit 2 are connected to an antenna port 5 of a terminal device through the first circulator 3;
the output terminal of the transmission circuit 1 and the input terminal of the reception circuit 2 are connected to an antenna 6 through the second circulator 4;
the transmitting circuit 1 is configured to convert the public network frequency band uplink signal transmitted by the antenna port 5 into a corresponding private network frequency band uplink signal;
the receiving circuit 2 is configured to convert a received private network frequency band downlink signal sent by a base station into a corresponding public network frequency band downlink signal;
the first circulator 3 is configured to transmit the uplink signal of the public network frequency band to the transmitting circuit 1 and transmit the downlink signal of the public network frequency band to the antenna interface 5;
the second circulator 4 is configured to transmit the uplink signal of the private network frequency band to the base station through the antenna 6 and receive the downlink signal of the private network frequency band through the antenna 6.
The terminal device may include a non-private network terminal device, and the base station may include a private network base station. The public network frequency band signal sent by the non-private network terminal device may be a signal in a public mobile communication network (public network) frequency band, specifically, the public network frequency band may include a communication network frequency band established by a network service operator and used by a public user, for example, the public network frequency band may be 1800MHz, 2.6GHz, and the public network frequency band signal is separated by the first circulator to obtain a public network frequency band uplink signal. The private network frequency band signal sent by the private network base station may be a signal in a private wireless network (private network) frequency band, specifically, the private network frequency band may include a network frequency band provided for government, public safety, public utilities, Industrial and commercial industries, for example, the private network frequency band may be a 2.4GHz ISM (Industrial Scientific Medical, Industrial, Scientific, Medical) frequency band, and the private network frequency band signal is separated by the second circulator to obtain a private network frequency band downlink signal.
The communication device provided by this embodiment can perform frequency band conversion on uplink and downlink signals between the non-private network terminal device and the private network base station, thereby implementing normal communication between the non-private network terminal device and the private network base station.
In a specific embodiment, as shown in fig. 3, the transmitting circuit 1 may include: a digital attenuator 11, a first mixer 12, a first band-pass filter 13, and a power amplifier 14;
an input terminal of the digital attenuator 11 is connected to a first terminal of the first circulator 3, an output terminal of the digital attenuator 11 is connected to an input terminal of the first mixer 12, an output terminal of the first mixer 12 is connected to an input terminal of the first band pass filter 13, an output terminal of the first band pass filter 13 is connected to an input terminal of the power amplifier 14, and an output terminal of the power amplifier 14 is connected to a first terminal of the second circulator 4.
In this embodiment, the first band pass filter is the private network band. Specifically, the digital attenuator is used for performing signal attenuation on the uplink signal of the public network frequency band; the first mixer is used for carrying out frequency band conversion on the attenuated public network frequency band uplink signals; the first band-pass filter is used for filtering the uplink signal of the private network frequency band after the frequency band conversion; and the power amplifier is used for carrying out power amplification on the filtered uplink signal of the private network frequency band.
According to the embodiment, the public network frequency band uplink signal sent by the terminal equipment can be converted into the private network frequency band uplink signal through the sending circuit, the private network frequency band uplink signal is filtered and amplified, and the private network frequency band uplink signal is sent to the base station through the antenna, so that the signal sending from the non-private network terminal equipment to the private network base station is realized.
In another specific embodiment, as shown in fig. 4, the transmitting circuit 1 may further include: a first low noise amplifier 15 and a second band pass filter 16;
an input terminal of the first low noise amplifier 15 is connected to an output terminal of the first band pass filter 13, an output terminal of the first low noise amplifier 15 is connected to an input terminal of the second band pass filter 16, and an output terminal of the second band pass filter 16 is connected to an input terminal of the power amplifier 14.
And the passband of the second band-pass filter is the private network frequency band. Specifically, the first low noise amplifier is used for amplifying the uplink signal of the private network frequency band, so as to improve the signal-to-noise ratio of the uplink signal of the private network frequency band; the second band-pass filter is used for carrying out secondary filtering on the uplink signals of the private network frequency band, and interference signals are further reduced.
In a specific embodiment, as shown in fig. 5, the sending circuit 2 may include: a second low noise amplifier 21, a third band pass filter 22, a third low noise amplifier 23, a second mixer 24, a fourth band pass filter 25, and a fourth low noise amplifier 26;
an input terminal of the second low noise amplifier 21 is connected to a second terminal of the second circulator 4, an output terminal of the second low noise amplifier 21 is connected to an input terminal of the third band pass filter 22, an output terminal of the third band pass filter 22 is connected to an input terminal of the third low noise amplifier 23, an output terminal of the third low noise amplifier 23 is connected to an input terminal of the second mixer 24, an output terminal of the second mixer 24 is connected to an input terminal of the fourth band pass filter 25, an output terminal of the fourth band pass filter 25 is connected to an input terminal of the fourth low noise amplifier 26, and an output terminal of the fourth low noise amplifier 26 is connected to a second terminal of the first circulator 3.
The passband of the third bandpass filter is the private network frequency band, and the passband of the fourth bandpass filter is the public network frequency band. Specifically, the second low noise amplifier is used for amplifying the downlink signal of the private network frequency band, so as to improve the signal-to-noise ratio of the downlink signal of the private network frequency band; the third band-pass filter is used for filtering the downlink signal of the private network frequency band and removing an interference signal; the third low-noise amplifier performs secondary amplification on the filtered private network frequency band downlink signal, so that the signal-to-noise ratio is improved; the second mixer converts the frequency band of the downlink signal of the private network frequency band to obtain a downlink signal of a public network frequency band; the fourth band-pass filter filters the downlink signals of the public network frequency band to remove interference signals; and the fourth low-noise amplifier amplifies the filtered downlink signal of the public network frequency band, so that the signal ratio is improved, and the non-private network terminal equipment can receive the downlink signal of the public network frequency band conveniently.
As can be seen from the above embodiments, the receiving circuit may amplify and then perform frequency band conversion on the received private network frequency band downlink signal, and then filter and amplify the obtained public network frequency band downlink signal and transmit the filtered and amplified signal to the antenna port of the terminal device, so as to implement signal transmission from the private network base station to the non-private network terminal device.
As shown in fig. 6, the apparatus may further include a serial peripheral interface 7, wherein the serial peripheral interface 7 is connected to the digital attenuator 11 and the first mixer 12 in the transmitting circuit 1, and the serial peripheral interface 7 is further connected to the second mixer 24 in the receiving circuit 2.
The external processor can control the digital attenuator, the first mixer and the second mixer by connecting the serial peripheral interface.
On the other hand, as shown in fig. 7, the present embodiment further provides a communication method, where the method is implemented based on the communication device, and the method specifically includes the following steps:
and S701, the first circulator transmits the public network frequency band uplink signal sent by the antenna port of the terminal equipment to a transmitting circuit.
In practical application, the circulator can separate the public network frequency band signal sent by the antenna port to obtain the public network frequency band uplink signal.
And S703, the transmitting circuit performs frequency band conversion on the uplink signal of the public network frequency band to obtain the uplink signal of the private network frequency band corresponding to the uplink signal of the public network frequency band.
In a specific embodiment, as shown in fig. 8, the frequency band converting the uplink signal in the public network frequency band by the transmitting circuit to obtain the uplink signal in the private network frequency band corresponding to the uplink signal in the public network frequency band may include:
and S801, the digital attenuator in the transmitting circuit performs attenuation processing on the uplink signal of the public network frequency band to obtain the attenuated uplink signal of the public network frequency band.
S803, the first mixer in the transmitting circuit performs frequency band conversion on the attenuated uplink signal in the frequency band of the public network, so as to obtain the uplink signal in the frequency band of the private network.
Specifically, the first mixer may convert the uplink signal of the public network frequency band sent by the non-private network terminal device into the uplink signal of the private network frequency band that can be received by the private network base station.
According to the embodiment, the technical scheme can attenuate and frequency-convert the uplink signal of the public network frequency band to obtain the uplink signal of the private network frequency band, so that the frequency band conversion of the uplink signal is realized.
In another specific embodiment, as shown in fig. 9, after the transmitting circuit performs frequency band conversion on the uplink signal in the public network frequency band to obtain an uplink signal in a private network frequency band corresponding to the uplink signal in the public network frequency band, the method may further include:
s901, the first bandpass filter in the transmitting circuit performs filtering processing on the uplink signal of the private network frequency band, so as to obtain a first filtered uplink signal of the private network frequency band.
Specifically, filtering is performed through a first band-pass filter, so that an interference signal in the uplink signal of the private network frequency band is removed.
And S903, the first low noise amplifier in the transmitting circuit amplifies the first filtered uplink signal of the private network frequency band to obtain a first amplified uplink signal of the private network frequency band.
Specifically, the private network frequency band uplink signal is amplified through the first low noise amplifier, and the signal to noise ratio of the private network frequency band uplink signal is improved.
And S905, the second band-pass filter in the transmitting circuit performs filtering processing on the first amplified private network frequency band uplink signal to obtain a second filtered private network frequency band uplink signal.
Specifically, secondary filtering is performed through a second band-pass filter, so that interference signals in the amplified uplink signals of the private network frequency band are further removed.
And S907, the power amplifier in the transmitting circuit amplifies the uplink signal of the private network frequency band after the second filtering to obtain the uplink signal of the private network frequency band after the second amplification.
Specifically, power amplification is performed through a power amplifier, and the transmission power of the uplink signal of the private network frequency band is improved.
S909, the second circulator transmits the second amplified uplink signal in the private network frequency band to the base station through the antenna.
According to the embodiment, after the uplink signal of the private network frequency band is filtered and amplified twice, the transmission power of the signal is improved and the signal is transmitted to the base station through the antenna, so that the signal transmission from the non-private network terminal equipment to the private network base station is realized.
And S705, the second circulator sends the private network frequency band uplink signal to a base station through an antenna.
S707, the second circulator receives, through the antenna, the private network frequency band downlink signal sent by the base station, and transmits the private network frequency band downlink signal to a receiving circuit.
S709, the receiving circuit performs frequency band conversion on the private network frequency band downlink signal to obtain a public network frequency band downlink signal corresponding to the private network frequency band downlink signal.
In a specific embodiment, as shown in fig. 10, the frequency band converting the downlink signal in the private network frequency band by the receiving circuit to obtain the downlink signal in the public network frequency band corresponding to the downlink signal in the private network frequency band may include:
and S1001, the second low noise amplifier in the receiving circuit amplifies the private network frequency band downlink signal to obtain a first amplified private network frequency band downlink signal.
Specifically, the downlink signal of the private network frequency band is amplified through the second low noise amplifier, so that the signal-to-noise ratio of the downlink signal of the private network frequency band is improved.
And S1003, the third band-pass filter in the receiving circuit performs filtering processing on the first amplified private network frequency band downlink signal to obtain a filtered private network frequency band downlink signal.
Specifically, the third band-pass filter is used for filtering the private network frequency band downlink signal, so as to remove the interference signal in the private network frequency band downlink signal.
S1005, the third low noise amplifier in the receiving circuit amplifies the filtered downlink signal of the private network frequency band, so as to obtain a second amplified downlink signal of the private network frequency band.
Specifically, the third low noise amplifier amplifies the downlink signal of the private network frequency band, so that the noise in the signal is reduced and the signal to noise ratio is improved while the signal is amplified.
S1007, the second mixer in the receiving circuit performs frequency band conversion on the second amplified downlink signal in the private network frequency band, so as to obtain the downlink signal in the public network frequency band.
Specifically, the second mixer may convert a private network frequency band downlink signal sent by the private network base station into a public network frequency band downlink signal that can be received by the non-private network terminal device.
It can be seen from the above embodiments that, by the above technical solution, the downlink signal of the private network frequency band can be amplified, filtered and frequency-converted to obtain the downlink signal of the public network frequency band, thereby realizing frequency band conversion of the downlink signal.
In another specific embodiment, as shown in fig. 11, after the receiving circuit performs frequency band conversion on the private network frequency band downlink signal to obtain a public network frequency band downlink signal corresponding to the private network frequency band downlink signal, the method may further include:
s1101, a fourth bandpass filter in the receiving circuit performs filtering processing on the downlink signal of the public network frequency band, so as to obtain a filtered downlink signal of the public network frequency band.
Specifically, the fourth bandpass filter filters the downlink signal of the public network frequency band to remove the interference signal in the downlink signal of the public network frequency band.
S1103, the fourth low noise amplifier in the receiving circuit amplifies the filtered downlink signal of the public network frequency band, so as to obtain an amplified downlink signal of the public network frequency band.
Specifically, the fourth low noise amplifier amplifies the downlink signal of the public network frequency band, reduces noise in the signal while amplifying the signal, and improves the signal-to-noise ratio.
S1105, the first circulator transmits the amplified downlink signal of the public network frequency band to the antenna port.
It can be seen from the above embodiments that, by the above technical solutions, after filtering and amplifying the downlink signal of the public network frequency band, the power of the signal is increased and transmitted to the terminal device through the antenna port, so as to implement signal reception of the private network base station by the non-private network terminal device.
S711, the first circulator transmits the downlink signal of the public network frequency band to the antenna port.
It can be seen from the above embodiments that, by the above technical solutions, frequency bands of uplink and downlink signals can be respectively converted, and communication between the non-private network terminal device and the private network base station is realized.
It can be seen from the above embodiments of the communication apparatus and method provided by the present application that, with the technical solution provided by the present application, the uplink signal of the public network frequency band sent by the non-private network terminal device can be converted into the uplink signal of the private network frequency band that can be received by the private network base station and the downlink signal of the private network frequency band sent by the private network base station can be converted into the downlink signal of the public network frequency band that can be received by the non-private network terminal device.
It is noted that while for simplicity of explanation, the foregoing method embodiments have been described as a series of acts, those skilled in the art will appreciate that the present invention is not limited by the order of acts, as some steps may, in accordance with the present invention, occur in other orders and concurrently. Further, the above embodiments may be arbitrarily combined to obtain other embodiments.
In the foregoing embodiments, the descriptions of the embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment. Those of skill in the art will further appreciate that the various illustrative logical blocks, units, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate the interchangeability of hardware and software, various illustrative components, elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Those skilled in the art may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present invention.
The foregoing description has disclosed fully preferred embodiments of the present invention. It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims is not to be limited to the specific embodiments described above.
Claims (12)
1. A communications apparatus, the apparatus comprising: the device comprises a transmitting circuit, a receiving circuit, a first circulator and a second circulator;
the input end of the transmitting circuit and the output end of the receiving circuit are connected to an antenna port of terminal equipment through the first circulator;
the output end of the transmitting circuit and the input end of the receiving circuit are connected to an antenna through the second circulator;
the transmitting circuit is used for converting the public network frequency band uplink signal transmitted by the antenna port into a corresponding private network frequency band uplink signal;
the receiving circuit is used for converting the received private network frequency band downlink signal sent by the base station into a corresponding public network frequency band downlink signal;
the first circulator is configured to transmit the uplink signal of the public network frequency band to the transmitting circuit and transmit the downlink signal of the public network frequency band to the antenna interface;
and the second circulator is used for sending the uplink signal of the private network frequency band to the base station through the antenna and receiving the downlink signal of the private network frequency band through the antenna.
2. The apparatus of claim 1, wherein the transmit circuit comprises: digital attenuator, first mixer, first band-pass filter and power amplifier, wherein:
the input end of the digital attenuator is connected with the first end of the first circulator, the output end of the digital attenuator is connected with the input end of the first mixer, the output end of the first mixer is connected with the input end of the first band-pass filter, the output end of the first band-pass filter is connected with the input end of the power amplifier, and the output end of the power amplifier is connected with the first end of the second circulator.
3. The apparatus of claim 2, wherein the transmit circuit further comprises: a first low noise amplifier and a second band pass filter, wherein:
the input end of the first low noise amplifier is connected with the output end of the first band-pass filter, the output end of the first low noise amplifier is connected with the input end of the second band-pass filter, and the output end of the second band-pass filter is connected with the input end of the power amplifier.
4. The apparatus of claim 1, wherein the receive circuit comprises: a second low noise amplifier, a third band pass filter, a third low noise amplifier, a second mixer, a fourth band pass filter, and a fourth low noise amplifier, wherein:
the input of second low noise amplifier with the second end of second circulator is connected, the output of second low noise amplifier with the input of third band pass filter is connected, the output of third band pass filter with the input of third low noise amplifier is connected, the output of third low noise amplifier with the input of second mixer is connected, the output of second mixer with the input of fourth band pass filter is connected, the output of fourth band pass filter with the input of fourth low noise amplifier is connected, the output of fourth low noise amplifier with the second end of first circulator is connected.
5. The apparatus of claim 3, wherein the pass bands of the first and second band pass filters are the private network frequency band.
6. The apparatus of claim 4, wherein the passband of the third bandpass filter is the private network band and the passband of the fourth bandpass filter is the public network band.
7. The apparatus of any of claims 1-6, further comprising a serial peripheral interface, the serial peripheral interface coupled to the digital attenuator and the first mixer in the transmit circuit, the serial peripheral interface further coupled to the second mixer in the receive circuit.
8. A communication method implemented on the basis of the communication device of any one of claims 1 to 7, characterized in that the method comprises:
the first circulator transmits a public network frequency band uplink signal sent by an antenna port of the terminal equipment to a transmitting circuit;
the transmitting circuit carries out frequency band conversion on the public network frequency band uplink signal to obtain a private network frequency band uplink signal corresponding to the public network frequency band uplink signal;
the second circulator sends the uplink signal of the private network frequency band to a base station through an antenna;
the second circulator receives a private network frequency band downlink signal sent by the base station through the antenna and transmits the private network frequency band downlink signal to a receiving circuit;
the receiving circuit carries out frequency band conversion on the private network frequency band downlink signal to obtain a public network frequency band downlink signal corresponding to the private network frequency band downlink signal;
and the first circulator transmits the downlink signal of the public network frequency band to the antenna port.
9. The method of claim 8, wherein the step of performing band conversion on the uplink signal in the public network frequency band by the transmitting circuit to obtain the uplink signal in the private network frequency band corresponding to the uplink signal in the public network frequency band comprises:
a digital attenuator in the transmitting circuit attenuates the uplink signal of the public network frequency band to obtain an attenuated uplink signal of the public network frequency band;
and a first mixer in the sending circuit performs frequency band conversion on the attenuated public network frequency band uplink signal to obtain the private network frequency band uplink signal.
10. The method according to claim 8 or 9, wherein after the transmitting circuit performs frequency band conversion on the uplink signal in the public network frequency band to obtain the uplink signal in the private network frequency band corresponding to the uplink signal in the public network frequency band, the method further comprises:
a first band-pass filter in the transmitting circuit performs filtering processing on the private network frequency band uplink signal to obtain a private network frequency band uplink signal after first filtering;
a first low noise amplifier in the sending circuit amplifies the uplink signal of the private network frequency band after the first filtering to obtain the uplink signal of the private network frequency band after the first amplification;
a second band-pass filter in the sending circuit filters the first amplified private network frequency band uplink signal to obtain a second filtered private network frequency band uplink signal;
a power amplifier in the sending circuit amplifies the uplink signal of the private network frequency band after the second filtering to obtain the uplink signal of the private network frequency band after the second amplification;
and the second circulator sends the uplink signal of the private network frequency band after the second amplification to the base station through the antenna.
11. The method of claim 8, wherein the receiving circuit performs band conversion on the private network band downlink signal to obtain a public network band downlink signal corresponding to the private network band downlink signal comprises:
a second low-noise amplifier in the receiving circuit amplifies the private network frequency band downlink signal to obtain a first amplified private network frequency band downlink signal;
a third band-pass filter in the receiving circuit filters the first amplified private network frequency band downlink signal to obtain a filtered private network frequency band downlink signal;
a third low-noise amplifier in the receiving circuit amplifies the filtered private network frequency band downlink signal to obtain a second amplified private network frequency band downlink signal;
and a second mixer in the receiving circuit performs frequency band conversion on the second amplified private network frequency band downlink signal to obtain the public network frequency band downlink signal.
12. The method according to claim 8 or 11, wherein after the receiving circuit performs frequency band conversion on the private network frequency band downlink signal to obtain a public network frequency band downlink signal corresponding to the private network frequency band downlink signal, the method further comprises:
a fourth band-pass filter in the receiving circuit performs filtering processing on the public network frequency band downlink signal to obtain a filtered public network frequency band downlink signal;
a fourth low-noise amplifier in the receiving circuit amplifies the filtered downlink signal of the public network frequency band to obtain an amplified downlink signal of the public network frequency band;
and the first circulator transmits the amplified downlink signal of the public network frequency band to the antenna port.
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