WO2022179505A1

WO2022179505A1 - Sub-band full-duplex communication system, method and apparatus

Info

Publication number: WO2022179505A1
Application number: PCT/CN2022/077299
Authority: WO
Inventors: 宋利; 俞鑫; 陈鹏; 李志军; 马霓
Original assignee: 华为技术有限公司
Priority date: 2021-02-26
Filing date: 2022-02-22
Publication date: 2022-09-01
Also published as: CN114978221B; CN114978221A

Abstract

Disclosed are a sub-band full-duplex communication system, method and apparatus. The system comprises: a first transceiving branch, which comprises a first antenna and a first circulator connected to the first antenna; a second transceiving branch, which comprises a second antenna and a second circulator connected to the second antenna; a power amplifier; a first tunable filter; a second tunable filter; a switching network, which is used for connecting/coupling the power amplifier to one of the first circulator and the second circulator by means of one of the first tunable filter and the second tunable filter; and a low noise amplifier, which is connected/coupled to the other one of the first circulator and the second circulator by means of the other one of the first tunable filter and the second tunable filter. The first tunable filter and the second tunable filter are synchronously switched respectively according to uplink and downlink changes of a slot under the control of the switching network, and bandwidths are synchronously adjusted, thereby ensuring that two sub-bands are always in a complementary state, and avoiding additional interference caused by non-complementary bandwidths.

Description

Subband full duplex communication system, method and device

This application claims the priority of the Chinese patent application with the application number 202110215979.4 and the application title "A Subband Full Duplex Communication System, Method and Device", which was submitted to the State Intellectual Property Office of China on February 26, 2021, and the entire contents of which are Incorporated herein by reference.

technical field

The present application relates to the field of communication technologies, and in particular, to a subband full-duplex communication system, method, and device.

Background technique

In industrial scenarios, high-bandwidth services and short-latency services coexist. In the traditional Time Division Duplex (TDD) system, large-bandwidth services and short-latency services use time slots with different time granularities (as shown in Figure 1), and the two are incompatible. When the traditional TDD system is applied to industrial scenarios There are problems of deployment difficulties and high application costs. Traditional Frequency Division Duplex (FDD) can meet the coexistence requirements of large-bandwidth services and short-latency services, but there is a frequency interval between the uplink and downlink spectrum of the system (as shown in Figure 2), so that the uplink and downlink frequency bands are separated. , to ensure mutual non-interference, resulting in a reduction in spectrum utilization; while traditional TDD systems use continuous spectrum and have high spectrum utilization, but cannot meet the scenarios where large-bandwidth services and short-latency services coexist. In addition, the traditional FDD system cannot directly use the continuous spectrum of the traditional TDD system, and the reciprocity problem is difficult to solve, and the industry needs a new system architecture.

The traditional TDD system architecture is shown in Figure 3. The antenna and the remote suppression filter are shared for transmission and reception, and the transmission and reception channels are switched through the RF switch. However, this system architecture cannot meet the needs of sub-band full-duplex transmission and reception at the same time.

The traditional FDD system architecture is shown in Figure 4. The antennas are shared for transceivers, and the transceiver channels are isolated through a circulator. The isolation is about 20dB. The duplexer is used to further improve the transceiver isolation. However, the system architecture cannot meet the full-duplex subband. Higher isolation, reciprocity needs.

SUMMARY OF THE INVENTION

The embodiments of the present application propose a sub-band full-duplex communication system, method, and device, which are used to solve the problem that the traditional TDD system cannot satisfy the sub-band full-duplex transceiving and simultaneously work, and the traditional FDD system cannot satisfy the sub-band full-duplex reciprocity. The problem. The technical solution is as follows:

In a first aspect, an embodiment of the present application proposes a subband full-duplex communication system, the system includes:

a first transceiver branch, a second transceiver branch, a first tunable filter, a second tunable filter, a power amplifier, a low noise amplifier and a switch network;

a first transceiver branch, including a first antenna and a first circulator connected to the first antenna;

The second transceiver branch includes a second antenna and a second circulator connected to the second antenna;

a switching network for establishing the power amplifier is connected/coupled to one of the first circulator and the second circulator through one of the first tunable filter and the second tunable filter; the low-noise amplifier passes through the first tunable filter the other of the filter and the second tunable filter is connected/coupled to the other of the first circulator and the second circulator;

Among them, one of the first tunable filter and the second tunable filter is used for uplink communication, and the other is used for downlink communication, the sum of the uplink bandwidth and the downlink bandwidth remains unchanged, and the first tunable filter and the third tunable filter are used for downlink communication. The two tunable filters are switched synchronously according to the uplink and downlink changes of the time slot under the control of the switch network. The bandwidths of the first and second antennas remain the same, ensuring reciprocity.

In a possible implementation, the above system further includes:

A radio frequency module for spectrum shifting, analog-to-digital conversion and/or digital-to-analog conversion, for connection to a power amplifier in downlink communication, and/or connection to a low noise amplifier in uplink communication;

IF module, used for phase compensation, time delay compensation and/or digital predistortion processing, used to connect to the radio frequency module during uplink communication and/or downlink communication;

The baseband module is used for fast Fourier transform, beamforming and/or multiple-input multiple-output MIMO decoding, and is used for connecting to the intermediate frequency module during uplink communication and/or downlink communication.

Through the realization of the radio frequency module, the intermediate frequency module and the baseband module in the sub-band full-duplex communication system, the spectrum utilization rate is improved, and it can be applied to various business scenarios.

In a possible implementation, the above system further includes: a first remote suppression filter and/or a second remote suppression filter;

The first remote suppression filter is used for downlink communication and suppresses the first harmonic signal; when the first circulator and the first adjustable filter are used for downlink communication, one end of the first remote suppression filter is connected to the first The first circulator after the tunable filter is disconnected or decoupled, and the other end of the first remote suppression filter is connected to the first tunable filter after disconnection or decoupling from the first circulator; When the second circulator and the second tunable filter are used for downlink communication, one end of the first remote suppression filter is connected to the second circulator after being disconnected or decoupled from the second tunable filter, and the first remote suppression filter The other end of the filter is connected to the second tunable filter after being disconnected or decoupled from the second circulator; and/or

The second remote suppression filter is used for uplink communication to suppress the second harmonic signal; when the second circulator and the second adjustable filter are used for uplink communication, one end of the second remote suppression filter is connected to the second The second circulator after the tunable filter is disconnected or decoupled, and the other end of the second remote suppression filter is connected to the second tunable filter after disconnection or decoupling from the second circulator; when the first When a circulator and the first tunable filter are used for uplink communication, one end of the second remote-end suppression filter is connected to the first circulator after being disconnected or decoupled from the first tunable filter, and the second remote-end suppression filter The other end of the filter is connected to the first tunable filter after being disconnected or decoupled from the first circulator.

The first far-end suppression filter is used to suppress the first harmonic signal, and the second far-end suppression filter is used to suppress the second harmonic signal, thereby reducing the interference intensity of the harmonic signal.

In a possible implementation, the switch network switches synchronously according to the uplink and downlink changes of the time slot, so that the first tunable filter and the second tunable filter are switched synchronously, and the bandwidth is adjusted synchronously, ensuring that the two subbands are always in a complementary state state, avoiding additional interference caused by non-complementary bandwidths.

In a second aspect, an embodiment of the present application further proposes a subband full-duplex communication method, which includes:

In a time slot, the downlink radio frequency chain is performed on the first wireless signal sequentially through the power amplifier, one of the first tunable filter and the second tunable filter, and one of the first transceiving branch and the second transceiving branch and/or through the other of the first transceiver branch and the second transceiver branch, the other one of the first tunable filter and the second tunable filter, and the low noise amplifier in turn to receive from the terminal The second wireless signal is transmitted on the uplink radio frequency link; wherein, the first transceiver branch includes a first antenna and a first circulator connected to the first antenna; the second transceiver branch includes a second antenna and is connected to the second antenna the second circulator;

In the next time slot of the above-mentioned one time slot, if there is a change of the time slot in the upstream and downstream, the switch network is switched, so that the first tunable filter and the second tunable filter are switched synchronously according to the change of the time slot in the upstream and downstream respectively. .

In a possible implementation, the first wireless signal is paired with the power amplifier, one of the first tunable filter and the second tunable filter, and one of the first transceiving branch and the second transceiving branch in sequence. Perform downlink RF link transmissions, including:

The first wireless signal is sequentially passed through the baseband module, the intermediate frequency module, the radio frequency module, the power amplifier, one of the first tunable filter and the second tunable filter, and one of the first transceiver branch and the second transceiver branch. perform downlink radio frequency link transmission;

The second wireless signal from the terminal received through the other of the first transceiving branch and the second transceiving branch, the other of the first tunable filter and the second tunable filter, and the low-noise amplifier pair in sequence Perform uplink RF link transmissions, including:

The receiver is received sequentially through the other of the first transceiver branch and the second transceiver branch, the other of the first tunable filter and the second tunable filter, a low noise amplifier, a radio frequency module, an intermediate frequency module, and a baseband module. The second wireless signal from the terminal is transmitted on the uplink radio frequency link.

In a possible implementation, the above method further includes:

Using the first remote suppression filter to suppress the first harmonic signal in the first wireless signal output by one of the first tunable filter and the second tunable filter will suppress the first harmonic signal after the first harmonic signal is suppressed. The wireless signal is transmitted to the first transceiver branch; and/or the second remote control filter suppresses the second one of the second wireless signal to be received by the other of the first tunable filter and the second tunable filter For the harmonic signal, the second wireless signal after suppressing the second harmonic signal is transmitted to the low noise amplifier through the other one of the first adjustable filter and the second adjustable filter.

In a possible implementation, the above method further includes:

Adjust the frequency spectrum position used by the terminal through the baseband module according to the signal-to-noise ratio of the second wireless signal from the terminal; or

According to the measured spectral responses of the first tunable filter and the second tunable filter, determine the compensation coefficient corresponding to each sub-carrier, and compensate each sub-carrier through the baseband module;

Wherein, before the second wireless signal from the terminal is received, a pre-weighting process is performed by the terminal, and the pre-weighting coefficient is determined according to the measured spectral responses of the first tunable filter and the second tunable filter;

By compensating for the signal distortion caused by the first tunable filter and the second tunable filter, it is ensured that no guard band is set between the subbands, and the spectrum utilization ratio is maximized.

In a third aspect, an embodiment of the present application further proposes a subband full-duplex communication method, which includes:

When one of the first tunable filter and the second tunable filter is used for downlink communication, the first wireless signal transmitted by the power amplifier is received, and the other of the first tunable filter and the second tunable filter transmitting the received second wireless signal from the terminal to a low noise amplifier;

Wherein, the first tunable filter and the second tunable filter are respectively switched synchronously according to the uplink and downlink changes of the time slot under the control of the switch network.

In a possible implementation, when one of the first tunable filter and the second tunable filter is used for downlink communication, the first wireless signal transmitted by the power amplifier is received, and the first tunable filter and the second tunable filter are used for downlink communication. Before the other of the two tunable filters transmits the received second wireless signal from the terminal to the low noise amplifier, the method further includes:

Receive preset bandwidth configuration information;

Adjust the uplink bandwidth or downlink bandwidth to the total bandwidth of the system according to the preset bandwidth configuration information; wherein, one of the first tunable filter and the second tunable filter is used to adjust the uplink bandwidth while the other is used to adjust the Downlink bandwidth. During the adjustment of the uplink bandwidth and the downlink bandwidth, the sum of the uplink bandwidth and the downlink bandwidth remains unchanged.

In a fourth aspect, an embodiment of the present application provides a sub-band full-duplex communication device, including at least one processor, where the processor is configured to execute an instruction stored in a memory, so that the above communication device executes:

The method according to the second aspect and each step in various possible implementations; or the method according to the third aspect and each step in various possible implementations.

In a fifth aspect, an embodiment of the present application provides a subband full-duplex communication device, including:

The signal transmission module is used for sequentially passing the power amplifier, one of the first tunable filter and the second tunable filter, and one of the first transceiver branch and the second transceiver branch to the first transceiver in a time slot. The wireless signal is transmitted on the downlink radio frequency link, and/or sequentially passes through the other of the first transceiver branch and the second transceiver branch, the other of the first tunable filter and the second tunable filter, low noise The amplifier performs uplink radio frequency link transmission on the second wireless signal received from the terminal; wherein, the first transceiver branch includes a first antenna and a first circulator connected to the first antenna; the second transceiver branch includes a second antenna and a second circulator connected to the second antenna;

The switch network switching module is used to switch the switch network in the next time slot of the above-mentioned one time slot, if the time slot changes in the upstream and downstream, so that the first tunable filter and the second tunable filter can be The uplink and downlink changes of the slot are switched synchronously.

In a possible implementation, the above-mentioned signal transmission module is specifically used to sequentially pass through the baseband module, the intermediate frequency module, the radio frequency module, the power amplifier, the first tunable filter and the second tunable filter in a time slot. One, one of the first transceiver branch and the second transceiver branch performs downlink radio frequency link transmission on the first wireless signal, and/or sequentially passes through the other, the second transceiver branch of the first transceiver branch and the second transceiver branch. The other one of the tunable filter and the second tunable filter, the low noise amplifier, the radio frequency module, the intermediate frequency module, and the baseband module perform uplink radio frequency link transmission on the second wireless signal received from the terminal; wherein the first The transceiver branch includes a first antenna and a first circulator connected to the first antenna; the second transceiver branch includes a second antenna and a second circulator connected to the second antenna.

In a possible implementation, the device further includes:

The harmonic signal suppression module is used to suppress the first harmonic signal in the first wireless signal output by one of the first tunable filter and the second tunable filter through the first remote suppression filter, and will suppress the first harmonic signal in the first wireless signal output by one of the first tunable filter and the second tunable filter. The first wireless signal after a harmonic signal is transmitted to the first transceiver branch; and/or the second remote-end suppression filter suppresses the other one of the first tunable filter and the second tunable filter to receive For the second harmonic signal in the second wireless signal, the second wireless signal after suppressing the second harmonic signal is transmitted to the low noise amplifier through the other one of the first tunable filter and the second tunable filter.

In a possible implementation, the device further includes:

a spectrum position adjustment module, configured to adjust the spectrum position used by the terminal through the baseband module according to the signal-to-noise ratio of the second wireless signal from the terminal; or

a subcarrier compensation module, configured to determine the compensation coefficient corresponding to each subcarrier according to the measured spectral responses of the first tunable filter and the second tunable filter, and compensate each subcarrier through the baseband module;

Wherein, before the second wireless signal from the terminal is received, a pre-weighting process is performed by the terminal, and the pre-weighting coefficient is determined according to the measured spectral responses of the first tunable filter and the second tunable filter.

In a sixth aspect, an embodiment of the present application proposes a subband full-duplex communication device, including:

The first transceiver module is used for receiving the first wireless signal transmitted by the power amplifier when one of the first tunable filter and the second tunable filter is used for downlink communication, the first tunable filter and the second tunable filter another one of the tuning filters transmits the received second wireless signal from the terminal to the low noise amplifier;

In a possible implementation, the device also includes:

a second transceiver module, configured to receive preset bandwidth configuration information;

The bandwidth adjustment module is used to adjust the uplink bandwidth or downlink bandwidth to the total bandwidth of the system according to the preset bandwidth configuration information; wherein, one of the first tunable filter and the second tunable filter is used to adjust the uplink bandwidth while , and the other is used to adjust the downlink bandwidth. During the process of adjusting the uplink bandwidth and the downlink bandwidth, the sum of the uplink bandwidth and the downlink bandwidth remains unchanged.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the method and each of the methods described in the second aspect Each step in one possible implementation is performed; or each step in the method and various possible implementations as described in the third aspect is performed.

In an eighth aspect, the embodiments of the present application provide a computer program product including instructions, when the computer program product runs on a computer, the computer is made to execute:

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments or a possible implementation of the present application, the following briefly introduces the drawings that need to be used in the embodiments or a possible implementation. Obviously, the following description The drawings in the drawings are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

FIG. 1 is a large-bandwidth service scenario and a short-delay service scenario using time slots of different time granularities in a traditional TDD system provided in a possible implementation manner;

Fig. 2 is the FDD scene that the uplink frequency spectrum and the downlink frequency spectrum provided in a possible implementation have frequency spacing;

FIG. 3 is a traditional TDD system architecture provided in a possible implementation manner;

FIG. 4 is a traditional FDD system architecture provided in a possible implementation manner;

5(A) and 5(B) are schematic diagrams including two sets of conventional TDD systems provided in a possible implementation manner;

Figures 6(A) to 6(D) are provided in a possible implementation manner by adding a power amplifier (Power Amplifier, PA) and/or a low noise amplifier (Low Noise Amplifier, LNA) in a traditional FDD system and Schematic diagram of the RF switch;

7 is a schematic diagram of a subband full-duplex communication system provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of a first transceiving branch and a second transceiving branch that can be switched between transmission and reception according to uplink and downlink changes of time slots according to an embodiment of the present application;

9 is a schematic diagram of real-time synchronous switching of the first tunable filter and the second tunable filter according to the uplink and downlink changes of the time slot provided by the embodiment of the present application;

10 is a schematic diagram of realizing that the respective bandwidths of the first tunable filter and the second tunable filter are synchronously adjusted by a synchronous tuning structure according to an embodiment of the present application;

11(A) and FIG. 11(B) are schematic diagrams of synchronous switching of the SPDT switch 1 and the SPDT switch 2 according to the uplink and downlink changes of the time slot according to the embodiment of the present application;

12(A) to FIG. 12(D) are schematic diagrams of four states that the switch network can switch to according to the uplink and downlink conversion of time slots according to the embodiments of the present application;

13 is a schematic diagram of a passband and a stopband of a first tunable filter and a second tunable filter in a large-bandwidth uplink industrial scenario provided by an embodiment of the present application;

14 is a schematic diagram of a passband and stopband of a first tunable filter and a second tunable filter in a large-bandwidth downlink industrial scenario provided by an embodiment of the present application;

15 is a schematic flowchart of a subband full-duplex communication method provided by an embodiment of the present application;

FIG. 16 is a schematic diagram of a complementary TDD scenario provided by an embodiment of the present application;

17 is another schematic flowchart of a subband full-duplex communication method provided by an embodiment of the present application;

FIG. 18 is a schematic structural diagram of a subband full-duplex communication device provided by an embodiment of the present application;

FIG. 19 is another schematic structural diagram of a subband full-duplex communication apparatus provided by an embodiment of the present application.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the specific implementations of the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

It should be noted that the term "and/or" in this application is only an association relationship to describe associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone and exists simultaneously A and B, there are three cases of B alone. The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order of the objects. For example, the first tunable filter and the second tunable filter etc. are used to distinguish different tunable filters, rather than to describe a specific order of the target objects. In the embodiments of the present application, words such as "exemplary", "for example" or "for example" are used to mean serving as an example, illustration or illustration. Any embodiments or designs described in the embodiments herein as "exemplary," "for example," or "such as" should not be construed as advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "plurality" refers to two or more.

Figure 5(A) is a possible implementation of a subband full duplex communication system. The system includes two sets of conventional TDD systems as shown in Figure 3. When the SPDT switch in the subband 1 is switched to be connected to the first PA505, as shown in FIG. 5(A), the first antenna 501 is used as a transmitting antenna, and the first wireless signal passes through the first baseband module (Baseband Lower , BBL) 513, the first intermediate frequency module 511, the first radio frequency module (Radio-On-a-Chip, ROC) 509, the first PA 505, the first remote suppression filter 503 and the first antenna 501 for downlink radio frequency link transmission. When the SPDT switch in the sub-band 2 is switched to be connected to the second LNA 506, as shown in FIG. 5(B), the second antenna 502 is used as a receiving antenna, and the second wireless signal passes through the second antenna 502, the second The far end rejection filter 504 , the second LNA 508 , the second ROC 510 , the second IF module 512 and the second BBL 514 . When the SPDT switch in subband 1 is switched to be connected to the first LNA 507, as shown in FIG. 5(B), the first antenna 501 is used as a receiving antenna, and the second wireless signal passes through the first antenna 501, the first The remote suppression filter 503, the first LNA 507, the first ROC 509, the first intermediate frequency module 511 and the first BBL 513 perform uplink radio frequency link transmission. When the SPDT switch in sub-band 2 is switched to be connected to the second PA506, as shown in FIG. 5(B), the second antenna 502 is used as a transmitting antenna, and the first wireless signal passes through the second BBL514, the second IF in sequence The module 512, the second ROC 510, the second PA 506, the second far end rejection filter 504 and the second antenna 502 perform downlink radio frequency link transmissions. However, directly stacking two sets of traditional TDD systems has the following defects: double physical resources, double the volume, serious transceiver interference problems, need to further extend the transceiver antenna module, double the cost, and cannot adapt to various uplink and downlink bandwidth adjustments.

Figure 6(A) is another possible implementation of a subband full duplex communication system. The system adds PAs and/or LNAs to traditional FDD systems, doubling the path, and adding RF switches. Referring to Fig. 6(A), the antenna can be used for both the receiving antenna and the transmitting antenna. When one SPDT switch is switched to position 1 and the other SPDT switch is switched to position 2, the first wireless signal passes through BBL610, IF module 609, ROC608, third PA604, duplexer 603, circulator 602 and The antenna 601 performs downlink radio frequency link transmission, and the second wireless signal sequentially passes through the antenna 601 , circulator 602 , duplexer 603 , third LNA 606 , ROC 608 , intermediate frequency module 609 and BBL 610 for uplink radio frequency link transmission. Correspondingly, as shown in Figure 6(B), when one SPDT switch is switched to position 2 and the other SPDT switch is switched to position 3, the first wireless signal passes through the BBL610, the IF module 609, the ROC608, the No. Four PA605, duplexer 603, circulator 602 and antenna 601 perform downlink radio frequency link transmission, and the second wireless signal passes through antenna 601, circulator 602, duplexer 603, third LNA606, ROC608, IF module 609 and BBL610 in sequence Perform uplink RF link transmissions. As shown in Figure 6(C), when one SPDT switch is switched to position 1 and the other SPDT switch is switched to position 4, the first wireless signal passes through BBL610, IF module 609, ROC608, third PA604, The duplexer 603, the circulator 602 and the antenna 601 perform downlink radio frequency link transmission, and the second wireless signal goes through the antenna 601, the circulator 602, the duplexer 603, the fourth LNA607, the ROC608, the intermediate frequency module 609 and the BBL610 for uplink radio frequency in sequence link transmission. As shown in Figure 6(D), when one SPDT switch is switched to position 1 and the other SPDT switch is switched to position 4, the first wireless signal passes through BBL610, IF module 609, ROC608, fourth PA605, The duplexer 603, the circulator 602 and the antenna 601 perform downlink radio frequency link transmission, and the second wireless signal goes through the antenna 601, the circulator 602, the duplexer 603, the fourth LNA607, the ROC608, the intermediate frequency module 609 and the BBL610 for uplink radio frequency in sequence link transmission. However, this method has the following defects: it requires multi-channel PA and LNA hardware, which doubles the cost, and the transceiver antenna coupling interference is serious. A guard band is required between the uplink frequency band and the downlink frequency band, the spectrum utilization rate decreases, and it cannot adapt to various uplink bandwidth and downlink bandwidth adjustments.

To this end, an embodiment of the present application provides a subband full-duplex communication system as shown in FIG. 7 . Referring to FIG. 7 , the sub-band full-duplex communication system includes the following components: a first transceiver branch, a second transceiver branch, a first far-end rejection filter 705 , a second far-end rejection filter 706 , and a first tunable filter 707, second tunable filter 708, PA709, LNA710, switching network, and ROC711, IF module 712 and BBL713.

Parts (A) and (B) in FIG. 7 constitute a complementary structure that can be switched between transceivers, that is, the first transceiver branch and the second transceiver branch. Wherein, part (A) in FIG. 7 is a high isolation antenna that can transmit and receive switching, including a first antenna 701 and a second antenna 702 ; part (B) in FIG. 7 is a first circulator 703 and a second circulator 704 . The complementary structure also draws on the traditional TDD/FDD system, and the functions can be switched as follows according to the time slot, as shown in Figure 8, that is, when the first transceiver branch works in the transmitting state, the second transceiver branch works in the receiving state; When one transceiver branch is switched to the receiving state, the second transceiver branch is switched to the transmitting state. The first transceiver branch includes a first antenna 701 and a first circulator 703 connected to the first antenna 701 , and the second transceiver branch includes a second antenna 702 and a second circulator 704 connected to the second antenna 702 . The operating bandwidths of the first antenna 701 and the second antenna 702 remain unchanged to ensure reciprocity. The first circulator 703 and the second circulator 704 are respectively cascaded with SPDT switches to ensure the maximum coupling path between the first antenna 701 and the second antenna 702 .

Part (C) in FIG. 7 is the first far-end rejection filter 705 for suppressing the first harmonic signal, and the second far-end rejection filter 706 for suppressing the second harmonic signal.

Part (D) in FIG. 7 includes the above-mentioned first tunable filter 707 and the above-mentioned second tunable filter 708, which are used for dynamic adjustment of uplink bandwidth and downlink bandwidth. There is a very narrow transition band between the above-mentioned first tunable filter 707 and the above-mentioned second tunable filter 708, keeping the sum of the uplink bandwidth and the downlink bandwidth unchanged, which is the total bandwidth of the subband full-duplex system and can be determined according to The uplink and downlink changes of the time slot perform real-time synchronous switching, which can be called a complementary filter. The switching process is shown in Figure 9. When the first tunable filter 707 is applied to the transmit band, the second tunable filter 708 is applied to the receive band; after time slot switching, the first tunable filter 707 is applied to the receive band, and the second tunable filter 708 applied to the transmit frequency band. That is, one of the above-mentioned first tunable filter 707 and the above-mentioned second tunable filter 708 is used for uplink communication, and the other is used for downlink communication. The sum of the uplink bandwidth and the downlink bandwidth is the total bandwidth of the system, which remains unchanged. , the above-mentioned first tunable filter 707 and the above-mentioned second tunable filter 708 are respectively switched synchronously according to the uplink and downlink changes of the time slot under the control of the above-mentioned switch network.

It should be noted that when the bandwidth of the first tunable filter 707 and the second tunable filter 708 are re-adjusted, the first tunable filter 707 and the second tunable filter 708 are realized through a synchronous tuning mechanism. The respective bandwidths are adjusted synchronously to ensure that the two subbands are always in a complementary state, avoiding additional interference caused by non-complementary bandwidths. Figure 10 shows a schematic diagram of synchronously adjusting their respective bandwidths.

One possible implementation of the above-mentioned synchronous tuning mechanism is to synchronously tune the mechanical screws driven by the electric motors for adjusting the first tunable filter and the second tunable filter. When the tuning parameters, such as the moving steps of the mechanical screws, are inconsistent, it can be completed through a partial waiting mechanism; or by adjusting the configuration voltages of the variable capacitors of the first tunable filter and the second tunable filter, synchronous tuning can be performed. When the tuning parameters, such as the configuration voltages of the variable capacitors, are inconsistent, it can be done through a partial wait mechanism. After the synchronous tuning of the mechanical screw or the variable capacitor is completed, the synchronous tuning of the coupling coefficient of the resonance unit is completed, and the effect that the bandwidth can be adjusted synchronously is obtained.

It should be noted that the above synchronous tuning mechanism includes but is not limited to the above two situations.

Part (E) in Figure 7 is PA709, and its bandwidth is the total bandwidth of the system, that is, the sum of the uplink bandwidth and the downlink bandwidth.

Part (F) in Figure 7 is the LNA 710, and its bandwidth is also the total bandwidth of the system, that is, the sum of the uplink bandwidth and the downlink bandwidth.

Part (G) in FIG. 7 includes a ROC 711 , an intermediate frequency module 712 and a BBL module 713 . Wherein, the ROC711 is used to connect to the PA709 during downlink communication, and/or to the LNA710 during uplink communication, and the above-mentioned ROC711 is used for spectrum shifting, analog-to-digital conversion and/or digital-to-analog conversion; the intermediate frequency module 712 is used for During uplink communication and/or downlink communication, it is connected to the radio frequency module 711, and the intermediate frequency module 712 is used for phase compensation, delay compensation and/or digital predistortion processing; the BBL module is used for uplink communication and/or downlink communication. IF module, BBL module is used for fast Fourier transform, beamforming and/or multiple input multiple output (Multiple Input Multiple Output, MIMO) decoding.

It should be noted that the above-mentioned switch network includes SPDT switches 1-6, which are switched synchronously according to the uplink and downlink changes of the time slot. Specifically, the SPDT switches 1 and 2 are switched synchronously according to the uplink and downlink changes of the time slot, and the SPDT switches 3, 4, 5 and 6 are switched synchronously according to the uplink and downlink changes of the time slot. When the first antenna 701 is used as the transmitting antenna and the second antenna 702 is used as the receiving antenna, the positions of the SPDT switch 1 and the SPDT switch 2 are switched as shown in FIG. 11(A). When the first antenna 701 is used as the receiving antenna and the second antenna 702 is used as the transmitting antenna, the positions of the SPDT switch 1 and the SPDT switch 2 are switched as shown in FIG. 11(B). When the first tunable filter 707 is used for downstream communication and the second tunable filter 708 is used for upstream communication, the positions to which the SPDT switches 3, 4, 5 and 6 are switched are shown in part (A) of FIG. 9 shown. When the first tunable filter 707 is used for upstream communication and the second tunable filter 708 is used for downstream communication, the positions to which the SPDT switches 3, 4, 5 and 6 are switched are as shown in part (B) of FIG. 9 shown.

12(A)-(D) are schematic diagrams of the switch network in different switching states.

As shown in FIG. 12(A), when the first tunable filter 707 is used for downlink communication, the second tunable filter 708 is used for uplink communication, and the first remote suppression filter 705 is connected to the first transceiver branch When the second remote suppression filter 706 is connected to the second transceiver branch, the first wireless signal sequentially passes through the BBL713, the intermediate frequency module 712, the ROC711, the PA709, the first adjustable filter 707, and the first remote suppression The filter 705 and the first transceiver branch perform downlink radio frequency link transmission. Referring to path 1, the second wireless signal sequentially passes through the second transceiver branch, the second remote suppression filter 706, the second tunable filter 708, and the LNA 710. , ROC711, IF module 712 and BBL713 for uplink radio frequency link transmission, see path 2.

As shown in FIG. 12(B), when the first tunable filter 707 is used for downlink communication, the second tunable filter 708 is used for uplink communication, and the first remote suppression filter 705 is connected to the second transceiver branch When the second remote suppression filter 706 is connected to the first transceiver branch, the first wireless signal passes through the BBL713, the intermediate frequency module 712, the ROC711, the PA709, the first adjustable filter 707, the first remote suppression The filter 705 and the second transceiver branch perform downlink RF link transmission. Referring to path 1, the second wireless signal passes through the first transceiver branch, the second remote suppression filter 706, the second tunable filter 708, and the LNA 710 in sequence. , ROC711, IF module 712 and BBL713 for uplink radio frequency link transmission, see path 2.

As shown in FIG. 12(C), when the first tunable filter 707 is used for uplink communication, the second tunable filter 708 is used for downlink communication, and the first remote suppression filter 705 is connected to the first transceiver branch When connecting, the first wireless signal passes through the BBL713, the intermediate frequency module 712, the ROC711, the PA709, the second tunable filter 708, the first remote suppression filter 705, and the first transceiver branch in sequence for downlink RF link transmission, see Path 1, the second wireless signal passes through the second transceiver branch, the second remote suppression filter 706, the first tunable filter 707, the LNA 710, the ROC 711, the IF module 712 and the BBL 713 for uplink RF link transmission in sequence, see path 2.

As shown in FIG. 12(D), when the first tunable filter 707 is used for uplink communication, the second tunable filter 708 is used for downlink communication, and the first remote suppression filter 705 is connected to the second transceiver branch When connecting, the first wireless signal passes through the BBL713, the intermediate frequency module 712, the ROC711, the PA709, the second tunable filter 708, the first remote suppression filter 705, and the second transceiver branch in sequence for downlink RF link transmission, see Path 1, the second wireless signal passes through the first transceiver branch, the second remote suppression filter 706, the first tunable filter 707, the LNA 710, the ROC 711, the IF module 712 and the BBL 713 for uplink RF link transmission in sequence, see path 2.

It should be noted that the above-mentioned subband full-duplex communication system can be applied to, but not limited to, the base station side or the terminal side.

It should also be noted that, the following three scenarios can be implemented through a subband full-duplex communication system according to an embodiment of the present application:

1) Large-bandwidth uplink industrial scenarios. B _UL >B _DL , the passband and stopband of the first tunable filter and the second tunable filter are shown in FIG. 13 . Among them, B _UL is the uplink bandwidth, and B _DL is the downlink bandwidth.

2) Large-bandwidth downlink industrial scenarios. B _UL <B _DL , the passbands and stopbands of the first tunable filter and the second tunable filter are shown in FIG. 14 .

3) Short-latency industrial scenarios. In this scenario, the bandwidth requirements are not high, and only a small part of the bandwidth needs to be allocated for the uplink communication and the downlink communication. Can be mixed with both 1) and 2) scenes.

The above-mentioned sub-band full-duplex communication system multiplexes the uplink channel and the downlink channel, which achieves the goal of reducing cost, and at the same time reduces the coupling degree of the transmitting and receiving channels through the transmitting and receiving separation antenna. By adding the first tunable filter and the second tunable filter , realizes the function of flexible adjustment of uplink bandwidth and downlink bandwidth

The embodiment of the present application further proposes a subband full-duplex communication method, the schematic flowchart of which is shown in FIG. 15 , including S1501 and S1502.

S1501, in a time slot, the first wireless signal sequentially passes through the PA, the first adjustable filter, and the first transceiver branch for downlink radio frequency link transmission, and/or the received second wireless signal from the terminal passes through the second wireless signal in sequence. The transceiver branch, the second tunable filter, and the LNA perform uplink radio frequency link transmission; or the first wireless signal sequentially passes through the PA, the second tunable filter, and the first transceiver branch for downlink radio frequency link transmission, and/ Or the received second wireless signal from the terminal sequentially passes through the second transceiver branch, the first tunable filter, and the LNA for uplink radio frequency link transmission; or the first wireless signal passes through the PA, the first tunable filter, and the LNA in sequence. The second transceiver branch performs downlink radio frequency link transmission, and/or the second wireless signal received from the terminal passes through the first transceiver branch, the second tunable filter, and the LNA in sequence for uplink radio frequency link transmission; A wireless signal sequentially passes through the PA, the second adjustable filter, and the second transceiver branch for downlink RF link transmission, and/or the second wireless signal received from the terminal passes through the first transceiver branch, the first adjustable The filter and LNA perform uplink RF link transmission. In the same time slot, the first transceiving branch and the second transceiving branch perform transceiving at the same time, and the states are opposite. Compared with the FDD system, the spectrum utilization ratio is improved.

S1502, in the next time slot of the above-mentioned one time slot, if the time slot changes in the up and down direction, switch the switch network, so that the first tunable filter and the second tunable filter change according to the time slot up and down respectively Synchronized switching.

The above-mentioned sub-band full-duplex communication method can be applied to the complementary TDD scenario shown in FIG. 16 . In this embodiment of the present application, for example, the scenario has 10 time slots. Before describing its specific working process, it should be noted that , the diamond marks 1-6 in Figures 12(A)-(D) are SPDT switches 1-6, and the

circular marks

1 and 2 represent path 1 and path 2, respectively. The specific working process of the complementary TDD scenario shown in Figure 16 is as follows:

1) From time slot 1 to time slot 4, the radio frequency link for downlink transmission of the first wireless signal is shown as path 1 in FIG. 12(A). The first wireless signal, such as service data, starts from the BBL and passes through the intermediate frequency module, the ROC, the PA, the first tunable filter, the first remote suppression filter, the first circulator and the first antenna in sequence. The radio frequency link for uplink transmission of the second wireless signal received from the terminal is shown as path 2 in FIG. 12(A). The second wireless signal is fed from the first antenna, passes through the second circulator, the second remote suppression filter, the second tunable filter, and the LNA in sequence to reach the ROC, and is then transmitted to the intermediate frequency module and the BBL in sequence; The far-end rejection filter suppresses the first harmonic signal in the first wireless signal output by the first adjustable filter; the second far-end rejection filter suppresses the second wireless signal from the terminal to be received by the second adjustable filter The second harmonic signal in ;

2) The time slot 5 changes up and down relative to the time slot 4, the switch network is switched, and the first tunable filter and the second tunable filter are switched synchronously according to the up and down changes of the time slot respectively. The radio frequency link for downlink transmission of the first wireless signal becomes as shown in path 1 in FIG. 12(D). The first wireless signal starts from the BBL and passes through the intermediate frequency module, the ROC, the PA, the second tunable filter, the first remote suppression filter, the second circulator and the second antenna in sequence. The radio frequency link for uplink transmission of the received second wireless signal from the terminal becomes as shown in path 2 in FIG. 12(D). The second wireless signal is fed from the first antenna, passes through the first circulator, the second remote suppression filter, the first tunable filter, and the LNA in sequence to reach the ROC, and is then transmitted to the intermediate frequency module and the BBL in sequence; The far-end rejection filter suppresses the first harmonic signal in the first wireless signal output by the second adjustable filter; the second far-end rejection filter suppresses the second wireless signal from the terminal to be received by the first adjustable filter The second harmonic signal in ;

3) The time slot 6 changes up and down relative to the time slot 5, and the switch network is switched, and the first tunable filter and the second tunable filter are switched synchronously according to the up and down changes of the time slot respectively. The working process from time slot 6 to time slot 8 is the same as 1);

4) The time slot 9 changes up and down relative to the time slot 8, and the switch network is switched, and the first tunable filter and the second tunable filter are switched synchronously according to the up and down changes of the time slot respectively. The working process from time slot 9 to time slot 10 is the same as 2);

5) According to the uplink and downlink changes of subsequent time slots, the specific working process of a subband full-duplex communication method refers to the processes 1) to 4).

It should be noted that the signal distortion caused by the first tunable filter and the second tunable filter can be compensated in the following ways:

1) Before the second wireless signal is received, a pre-weighting process is performed by the terminal, and the pre-weighting coefficient is determined according to the measured spectral responses of the first tunable filter and the second tunable filter; and/or

2) the baseband module adjusts the frequency spectrum position used by the terminal according to the received signal-to-noise ratio of the second wireless signal; and/or

3) The baseband module determines the compensation coefficient corresponding to each subcarrier according to the measured spectral responses of the first tunable filter and the second tunable filter, and compensates each subcarrier.

The compensation scheme for the signal distortion caused by the first tunable filter and the second tunable filter ensures that no guard band is set between the subbands and maximizes the spectrum utilization.

FIG. 17 is another schematic flowchart of a subband full-duplex communication method provided by an embodiment of the present application. The schematic flowchart includes: S1701. This method describes the specific working process of the first tunable filter and the second tunable filter in a subband full-duplex communication method corresponding to FIG. 15 , and the specific working process is as follows:

The first tunable filter and the second tunable filter in a subband full-duplex communication system as shown in FIG. 7 receive preset bandwidth configuration information. The first tunable filter and the second tunable filter perform uplink bandwidth or downlink bandwidth adjustment on the total bandwidth of the system according to the above-mentioned preset bandwidth configuration information; wherein, the first tunable filter and the second tunable filter are One adjusts the uplink bandwidth while the other adjusts the downlink bandwidth. During the process of adjusting the uplink bandwidth and the downlink bandwidth, the sum of the uplink bandwidth and the downlink bandwidth remains unchanged. When one of the first tunable filter and the second tunable filter is used for downlink communication, the first wireless signal transmitted by the PA is received, and the other one of the first tunable filter and the second tunable filter will The received second wireless signal from the terminal is transmitted to the LNA; wherein, the first tunable filter and the second tunable filter are respectively switched synchronously according to the uplink and downlink changes of the time slot under the control of the switch network.

An embodiment of the present application further provides a sub-band full-duplex communication device, including at least one processor, where the processor is configured to execute a program stored in a memory, and when the program is executed, the device is made to perform the following steps:

In one time slot, the downlink radio frequency is performed on the first wireless signal through the PA, one of the first tunable filter and the second tunable filter, and one of the first transceiving branch and the second transceiving branch in sequence transmit, and/or sequentially pass through the other of the first transceiving branch or the second transceiving branch, the other of the first tunable filter and the second tunable filter, and the LNA pair received from the terminal. The wireless signal is transmitted on the uplink radio frequency link; wherein, the first transceiver branch includes a first antenna and a first circulator connected to the first antenna; the second transceiver branch includes a second antenna and a second antenna connected to the second antenna Circulator; in the next time slot of a time slot, if there is a time slot upstream and downstream change, switch the switch network, so that the first tunable filter and the second tunable filter change according to the time slot upstream and downstream respectively Synchronized switching.

In a possible implementation, the above steps are performed on the first wireless signal through the PA, one of the first tunable filter and the second tunable filter, and one of the first transceiving branch and the second transceiving branch in sequence. Downlink RF link transmissions, including:

The first wireless signal is processed sequentially through the baseband module, the intermediate frequency module, the radio frequency module, the PA, one of the first tunable filter and the second tunable filter, the first transceiver branch or the second transceiver branch. Downlink RF link transmission;

In the above, the second wireless signal received from the terminal is uplinked through the other of the first transceiver branch or the second transceiver branch, the other of the first tunable filter and the second tunable filter, and the LNA in sequence. RF link transmission, including:

Through the other of the first transceiving branch and the second transceiving branch, the other of the first tunable filter and the second tunable filter, the LNA, the radio frequency module, the intermediate frequency module, and the baseband module in turn, the received data is The second wireless signal of the terminal performs uplink radio frequency link transmission.

In a possible implementation, a subband full-duplex communication method corresponding to the schematic flowchart shown in FIG. 15 further includes:

Using the first remote suppression filter to suppress the first harmonic signal in the first wireless signal output by one of the first tunable filter and the second tunable filter will suppress the first harmonic signal after the first harmonic signal is suppressed. The wireless signal is transmitted to the first transceiver branch; and/or the second remote control filter suppresses the second one of the second wireless signal to be received by the other of the first tunable filter and the second tunable filter For the harmonic signal, the second wireless signal after suppressing the second harmonic signal is transmitted to the LNA through the other one of the first tunable filter and the second tunable filter.

Wherein, before the second wireless signal from the terminal is received, a pre-weighting process is performed by the terminal, and the pre-weighting coefficient is determined according to the measured spectral responses of the first tunable filter and the second tunable filter. or

When one of the first tunable filter and the second tunable filter is used for downlink communication, the first wireless signal transmitted by the PA is received, and the other one of the first tunable filter and the second tunable filter will The received second wireless signal from the terminal is transmitted to the LNA; wherein, the first tunable filter and the second tunable filter are respectively switched synchronously according to the uplink and downlink changes of the time slot under the control of the switch network.

In a possible implementation, when one of the first tunable filter and the second tunable filter is used for downlink communication, the first wireless signal transmitted by the PA is received, and the first tunable filter and the second tunable filter are used for downlink communication. Before another one of the adjustable filters transmits the received second wireless signal from the terminal to the LNA, a subband full-duplex communication method corresponding to the schematic flowchart shown in FIG. 17 further includes:

Receive preset bandwidth configuration information; in a possible implementation, preset bandwidth configuration information from BBL.

The embodiment of the present application also provides a schematic structural diagram of a subband full-duplex communication device as shown in FIG. 18 , where the structural schematic diagram includes:

The signal transmission module 1801 is used for, in one time slot, sequentially pass the PA, one of the first tunable filter and the second tunable filter, and one of the first transceiving branch and the second transceiving branch to the first transceiving branch. The wireless signal is transmitted on the downlink radio frequency link, and/or sequentially passes through the other of the first transceiver branch and the second transceiver branch, the other of the first tunable filter and the second tunable filter, and the LNA pair The received second wireless signal from the terminal is transmitted on the uplink radio frequency link; wherein, the first transceiver branch includes a first antenna and a first circulator connected to the first antenna; the second transceiver branch includes a second antenna and a a second circulator connected to the second antenna;

The switch network switching module 1802 is configured to switch the switch network in the next time slot of a time slot, if the time slot changes from upstream to downstream, so that the first tunable filter and the second tunable filter are adjusted according to The uplink and downlink changes of the slot are switched synchronously.

In a possible implementation, the above-mentioned signal transmission module is specifically configured to sequentially pass through one of the baseband module, the intermediate frequency module, the radio frequency module, the PA, the first tunable filter and the second tunable filter in a time slot , one of the first transceiver branch and the second transceiver branch performs downlink radio frequency link transmission on the first wireless signal, and/or sequentially passes through the other of the first transceiver branch and the second transceiver branch, the first transceiver The other of the tunable filter and the second tunable filter, the LNA, the radio frequency module, the intermediate frequency module, and the baseband module perform uplink radio frequency link transmission on the second wireless signal received from the terminal; wherein the first transceiver branch It includes a first antenna and a first circulator connected to the first antenna; the second transceiver branch includes a second antenna and a second circulator connected to the second antenna.

In a possible implementation, the device further includes:

The harmonic signal suppression module is used to suppress the first harmonic signal in the first wireless signal output by one of the first tunable filter and the second tunable filter through the first remote suppression filter, and will suppress the first harmonic signal in the first wireless signal output by one of the first tunable filter and the second tunable filter. The first wireless signal after a harmonic signal is transmitted to the first transceiver branch; and/or the second remote-end suppression filter suppresses the other one of the first tunable filter and the second tunable filter to receive For the second harmonic signal in the second wireless signal, the second wireless signal after suppressing the second harmonic signal is transmitted to the LNA through the other one of the first tunable filter and the second tunable filter.

In a possible implementation, the device further includes:

This embodiment of the present application also provides another schematic structural diagram of a subband full-duplex communication device as shown in FIG. 19 , where the schematic structural diagram includes:

The first transceiver module 1901 is used to receive the first wireless signal transmitted by the PA when one of the first tunable filter and the second tunable filter is used for downlink communication. another one of the tuning filters transmits the received second wireless signal from the terminal to the LNA;

Wherein, the first tunable filter and the second tunable filter are respectively switched synchronously according to the uplink and downlink changes of the time slot under the control of the switch network. .

In a possible implementation, the device further includes:

Embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, a subband full-dual corresponding to the schematic flowchart shown in FIG. 15 is displayed. Each step of the industrial communication method is executed; or each step of a subband full-duplex communication method corresponding to the schematic flowchart shown in FIG. 17 is executed.

The embodiments of the present application also provide a computer program product containing instructions, when the computer program product is run on a computer, the computer program product is caused to execute:

Each step of a sub-band full-duplex communication method corresponding to the schematic flowchart shown in FIG. 15 ; or each step of a sub-band full-duplex communication method corresponding to the schematic flowchart shown in FIG. 17 .

It should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: it can still be used for The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present application.

Claims

A subband full-duplex communication system, comprising:

a first transceiver branch, a second transceiver branch, a first tunable filter, a second tunable filter, a power amplifier, a low noise amplifier and a switch network;

the first transceiver branch includes a first antenna and a first circulator connected to the first antenna;

the second transceiver branch includes a second antenna and a second circulator connected to the second antenna;

the switching network for establishing the power amplifier through one of the first tunable filter and the second tunable filter and one of the first circulator and the second circulator connection/coupling; the low noise amplifier is connected to the other of the first circulator and the second circulator through the other of the first tunable filter and the second tunable filter /coupling;

Wherein, one of the first tunable filter and the second tunable filter is used for uplink communication, and the other is used for downlink communication, and the sum of the uplink bandwidth and the downlink bandwidth remains unchanged, and the first The tunable filter and the second tunable filter are respectively switched synchronously according to the uplink and downlink changes of the time slot under the control of the switch network.
The system of claim 1, wherein the system further comprises:

a radio frequency module for spectrum shifting, analog-to-digital conversion and/or digital-to-analog conversion, for connecting to the power amplifier during downlink communication, and/or connecting to the low noise amplifier during uplink communication;

an intermediate frequency module for phase compensation, time delay compensation and/or digital pre-distortion processing, for connecting to the radio frequency module during uplink communication and/or downlink communication;

A baseband module for fast Fourier transform, beamforming and/or multiple-input multiple-output MIMO decoding, for connecting to the intermediate frequency module during uplink communication and/or downlink communication.
system according to claim 1, is characterized in that, described system also comprises: the first far-end suppression filter and/or the second far-end suppression filter;

The first remote suppression filter is used for downlink communication and suppresses the first harmonic signal; when the first circulator and the first tunable filter are used for downlink communication, the first remote suppression filter One end of the filter is connected to the first circulator after being disconnected or decoupled from the first adjustable filter, and the other end of the first remote suppression filter is connected to the first circulator disconnected from the first tunable filter. The first tunable filter after disconnection or decoupling; when the second circulator and the second tunable filter are used for downlink communication, one end of the first remote suppression filter is connected to the The second circulator after the second tunable filter is disconnected or decoupled, and the other end of the first remote suppression filter is disconnected or decoupled from the second circulator the second tunable filter; and/or

The second far-end suppression filter is used for uplink communication to suppress the second harmonic signal; when the second circulator and the second tunable filter are used for uplink communication, the second far-end suppression filter One end of the filter is connected to the second circulator after being disconnected or decoupled from the second adjustable filter, and the other end of the second remote suppression filter is connected to the second circulator disconnected from the second tunable filter. The second tunable filter after disconnection or decoupling; when the first circulator and the first tunable filter are used for uplink communication, one end of the second remote suppression filter is connected to the The first circulator after the first tunable filter is disconnected or decoupled, and the other end of the second remote suppression filter is disconnected or decoupled from the first circulator. of the first tunable filter.
The system according to claim 1, wherein the switch network is switched synchronously according to the change of the time slot in the uplink and downlink.
A subband full-duplex communication method, comprising:

In a time slot, the downlink radio frequency chain is performed on the first wireless signal through the power amplifier, one of the first tunable filter and the second tunable filter, and one of the first transceiving branch or the second transceiving branch in turn. channel transmission, and/or sequentially pass through the other of the first transceiver branch or the second transceiver branch, the other of the first tunable filter and the second tunable filter, The low noise amplifier performs uplink radio frequency link transmission on the second wireless signal received from the terminal; wherein the first transceiver branch includes a first antenna and a first circulator connected to the first antenna; the first transceiver Two transceiver branches include a second antenna and a second circulator connected to the second antenna;

In the next time slot of the one time slot, if the time slot changes in the up and down direction, the switch network is switched, so that the first tunable filter and the second tunable filter are respectively adjusted according to the time slot. Synchronous switching of uplink and downlink changes.
The method according to claim 5, wherein the step of sequentially passing the power amplifier, one of the first tunable filter and the second tunable filter, the first transceiving branch or the second transceiving branch A downlink radio frequency link transmission for the first wireless signal, including:

The first wireless signal is connected to the first wireless signal through one of the baseband module, the intermediate frequency module, the radio frequency module, the power amplifier, one of the first tunable filter and the second tunable filter, the first transceiver branch or the second transceiver branch in sequence perform downlink radio frequency link transmission;

Said sequentially passing through the other of the first transceiving branch or the second transceiving branch, the other of the first tunable filter and the second tunable filter, and a pair of low noise amplifiers The received second wireless signal from the terminal performs uplink radio frequency link transmission, including:

Pass through the other of the first transceiving branch or the second transceiving branch, the other of the first tunable filter and the second tunable filter, the low noise amplifier, the The radio frequency module, the intermediate frequency module, and the baseband module perform uplink radio frequency link transmission on the second wireless signal received from the terminal.
method according to claim 5, is characterized in that, described method also comprises:

Suppressing the first harmonic signal in the first wireless signal output by one of the first tunable filter and the second tunable filter by the first remote suppression filter will suppress the first harmonic signal and/or suppress the other one of the first tunable filter and the second tunable filter from The second harmonic signal in the received second wireless signal is transmitted through the other of the first tunable filter and the second tunable filter after suppressing the second harmonic signal to the low noise amplifier.
The method according to claim 5, wherein the method further comprises:

Adjusting, by the baseband module, the frequency spectrum position used by the terminal according to the signal-to-noise ratio of the second wireless signal from the terminal; or

According to the measured spectral responses of the first tunable filter and the second tunable filter, a compensation coefficient corresponding to each sub-carrier is determined, and each sub-carrier is compensated by the baseband module;

Wherein, before the second wireless signal from the terminal is received, the terminal performs pre-weighting processing, and the pre-weighting coefficient is determined according to the measured spectral responses of the first tunable filter and the second tunable filter .
A subband full-duplex communication method, comprising:

When one of the first tunable filter and the second tunable filter is used for downlink communication, receiving the first wireless signal transmitted by the power amplifier, the first tunable filter and the second tunable filter another one of the adjustable filters transmits the received second wireless signal from the terminal to the low noise amplifier;

Wherein, the first tunable filter and the second tunable filter are respectively switched synchronously according to the uplink and downlink changes of the time slot under the control of the switch network.
The method according to claim 9, wherein when one of the first tunable filter and the second tunable filter is used for downlink communication, receiving the first wireless signal transmitted by the power amplifier signal, before the other of the first tunable filter and the second tunable filter transmits the received second wireless signal from the terminal to the low noise amplifier, the method further includes:

Receive preset bandwidth configuration information;

Adjust the uplink bandwidth or downlink bandwidth to the total bandwidth of the system according to the preset bandwidth configuration information; wherein, one of the first tunable filter and the second tunable filter is used to adjust the uplink bandwidth, and the other is used to adjust the uplink bandwidth. During the process of adjusting the downlink bandwidth, the uplink bandwidth and the downlink bandwidth, the sum of the uplink bandwidth and the downlink bandwidth remains unchanged.
A sub-band full-duplex communication device, comprising at least one processor, the processor is used to execute a program stored in a memory, and when the program is executed, the device is made to execute:

The method of any one of claims 5-8; or the method of any one of claims 9-10.
A subband full-duplex communication device, comprising:

The signal transmission module is used for sequentially passing the power amplifier, one of the first tunable filter and the second tunable filter, one of the first transceiver branch or the second transceiver branch to the first transceiver in a time slot. The wireless signal is transmitted on the downlink radio frequency link, and/or sequentially passes through the other of the first transceiver branch or the second transceiver branch, the first tunable filter and the second tunable filter Another one of the devices, the low noise amplifier, performs uplink radio frequency link transmission on the second wireless signal received from the terminal; wherein, the first transceiver branch includes a first antenna and a first antenna connected to the first antenna a circulator; the second transceiver branch includes a second antenna and a second circulator connected to the second antenna;

A switch network switching module, configured to switch the switch network in the next time slot of the one time slot, if the time slot changes from up to down, so as to make the first adjustable filter and the second adjustable filter The filters are switched synchronously according to the uplink and downlink changes of the time slots respectively.
The device according to claim 12, wherein the signal transmission module is specifically configured to sequentially pass through the baseband module, the intermediate frequency module, the radio frequency module, the power amplifier, the first tunable filter and the second time slot in one time slot. One of the tunable filters, one of the first transceiver branch or the second transceiver branch performs downlink radio frequency link transmission on the first wireless signal, and/or sequentially passes through the first transceiver branch or the first transceiver branch. The other of the two transceiver branches, the other of the first tunable filter and the second tunable filter, a low noise amplifier, the radio frequency module, the intermediate frequency module, and the baseband module pair The received second wireless signal from the terminal is transmitted on the uplink radio frequency link; wherein, the first transceiver branch includes a first antenna and a first circulator connected to the first antenna; the second transceiver branch A second antenna and a second circulator connected to the second antenna are included.
device according to claim 12, is characterized in that, described device also comprises:

A harmonic signal suppression module for suppressing a first harmonic signal in a first wireless signal output by one of the first tunable filter and the second tunable filter through a first remote suppression filter , transmitting the first wireless signal after suppressing the first harmonic signal to the first transceiver branch; and/or suppressing the first tunable filter and the second adjustable filter through a second remote suppression filter the second harmonic signal in the second wireless signal to be received by the other one of the tunable filters, and the second harmonic signal will be suppressed by the other one of the first tunable filter and the second tunable filter The second wireless signal after the signal is transmitted to the low noise amplifier.
device according to claim 12, is characterized in that, described device also comprises:

a frequency spectrum position adjustment module, configured to adjust the frequency spectrum position used by the terminal through the baseband module according to the signal-to-noise ratio of the second wireless signal from the terminal; or

The subcarrier compensation module is configured to determine the compensation coefficient corresponding to each subcarrier according to the measured spectral responses of the first tunable filter and the second tunable filter. carrier compensation;

Wherein, before the second wireless signal from the terminal is received, the terminal performs pre-weighting processing, and the pre-weighting coefficient is determined according to the measured spectral responses of the first tunable filter and the second tunable filter .
A subband full-duplex communication device, comprising:

a first transceiver module, configured to receive the first wireless signal transmitted by the power amplifier when one of the first adjustable filter and the second adjustable filter is used for downlink communication, the first adjustable filter the other of the filter and the second tunable filter transmits the received second wireless signal from the terminal to a low noise amplifier;

Wherein, the first tunable filter and the second tunable filter are respectively switched synchronously according to the uplink and downlink changes of the time slot under the control of the switch network.
The apparatus of claim 16, wherein the apparatus further comprises:

a second transceiver module, configured to receive preset bandwidth configuration information;

A bandwidth adjustment module, configured to perform uplink bandwidth or downlink bandwidth adjustment on the total bandwidth of the system according to the preset bandwidth configuration information; wherein one of the first tunable filter and the second tunable filter is used to adjust the uplink bandwidth At the same time, the other is used to adjust the downlink bandwidth. During the process of adjusting the uplink bandwidth and the downlink bandwidth, the sum of the uplink bandwidth and the downlink bandwidth remains unchanged.
A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor,

The method of any one of claims 5-8 is performed; or the method of any one of claims 9-10 is performed.
A computer program product comprising instructions, wherein, when the computer program product is run on a computer, the computer is caused to execute:

The method of any one of claims 5-8; or the method of any one of claims 9-10.