A full-duplex antenna and communication node

Abstract

The application discloses a full-duplex antenna and a communication node. The full-duplex antenna comprises one transmitting antenna, N receiving antenna groups and N radio frequency links, the receiving antenna groups are connected with the radio frequency links one by one, each receiving antenna group comprises at least two receiving antennas, N is an integer greater than or equal to 2; the radio frequency link is arranged to acquire first signals received by all the receiving antennas in the receiving antenna group connected with the radio frequency link, and to synthesize a second signal according to the first signals, the power of a self-interference signal related to the transmitting antenna in a full-duplex transmission mode is a first power, the power of a self-interference signal related to the transmitting antenna in the full-duplex transmission mode is a second power, and the second power is less than any first power.

Description

Technical Field

[0001] This application relates to the field of communications, for example to a full-duplex antenna and a communication node. Background Technology

[0002] With the continuous development of vehicle-to-everything (V2X) technology, the construction of collaborative application capabilities in the V2X field has become an important issue in ensuring and promoting the development of the V2X industry. In order to effectively support various applications, including autonomous driving, V2X technology needs to support Ultra Reliable Low Latency Communication (URLLC). However, the number of antennas used in existing vehicle-to-vehicle (V2V) communication is very small (e.g., 1-2), and it is a half-duplex design, which is not conducive to the implementation of URLLC. Summary of the Invention

[0003] This application provides a full-duplex antenna and communication node, which adopts multi-receiver antenna technology, increases the number of supported users, effectively suppresses antenna self-interference, and uses full-duplex technology to achieve simultaneous data transmission and reception, greatly improving spectrum efficiency and reducing transmission latency.

[0004] This application provides a full-duplex antenna, including: one transmitting antenna, N receiving antenna groups and N radio frequency links, wherein the receiving antenna groups are connected to the radio frequency links one by one, and each receiving antenna group includes at least two receiving antennas, and N is an integer greater than or equal to 2;

[0005] The radio frequency link is configured to acquire the first signal received by all receiving antennas in the receiving antenna group connected to the radio frequency link, and synthesize a second signal based on the first signal. The power of the self-interference signal associated with the transmitting antenna in the full-duplex transmission mode of the first signal is the first power, and the power of the self-interference signal associated with the transmitting antenna in the full-duplex transmission mode of the second signal is the second power. The second power is less than any of the first powers.

[0006] This application provides a communication node including a full-duplex antenna having the features of any of the above embodiments.

[0007] Further details regarding the above embodiments and other aspects of this application, as well as their implementations, are provided in the accompanying drawings, detailed description, and claims. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a receiving beam formed by a receiving antenna array according to one embodiment;

[0009] Figure 2a This is a schematic diagram of the energy coverage simulation results of a conventional antenna provided in one embodiment;

[0010] Figure 2b This is a schematic diagram of the energy coverage simulation results of the full-duplex antenna of this application provided in one embodiment;

[0011] Figure 2c This is a comparison diagram of self-interference suppression between a conventional antenna provided in one embodiment and a full-duplex antenna of this application;

[0012] Figure 3 This is a schematic diagram of the structure of a full-duplex antenna provided in one embodiment;

[0013] Figure 4 This is a schematic diagram of another full-duplex antenna provided in one embodiment;

[0014] Figure 5 This is a schematic diagram of another full-duplex antenna provided in one embodiment;

[0015] Figure 6 This is a schematic diagram of another full-duplex antenna provided in one embodiment;

[0016] Figure 7 This is a schematic diagram of another full-duplex antenna provided in one embodiment;

[0017] Figure 8 This is a schematic diagram of yet another full-duplex antenna provided in one embodiment;

[0018] Figure 9 This is a schematic diagram illustrating how a full-duplex antenna adjusts the combining coefficient by minimizing the self-interference signal strength, as provided in one embodiment.

[0019] Figure 10 This is a schematic diagram illustrating how a full-duplex antenna adjusts the combining coefficients by estimating the channel antenna by antenna in one embodiment.

[0020] Figure 11 This is a schematic diagram illustrating how a full-duplex antenna adjusts the combining coefficient by calculating the residual self-interference signal strength, as provided in one embodiment.

[0021] Figure 12 This is a schematic diagram illustrating how a full-duplex antenna combines N second signals to obtain K data estimation signals, according to one embodiment.

[0022] Figure 13 This is a schematic diagram of another full-duplex antenna provided in one embodiment, which combines N second signals to obtain K data estimation signals;

[0023] Figure 14 This is a schematic diagram of another full-duplex antenna provided in one embodiment, which combines N second signals to obtain K data estimation signals;

[0024] Figure 15 This is a schematic diagram of the structure of a UE provided in one embodiment. Detailed Implementation

[0025] The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0026] Vehicle-to-everything (V2X) technology is a key technology that relies on advanced communication, sensing, computing, and control technologies to comprehensively perceive and intelligently manage vehicles and traffic. It is currently in a critical stage of rapid development. As V2X technology matures and its service capabilities become more comprehensive, its potential market and profit margins are enormous. Furthermore, given that this field involves multiple industries such as automotive, electronics, communications, and the internet, building collaborative application capabilities in the V2X field has become an important issue for ensuring and promoting the development of the V2X industry.

[0027] To effectively support various applications, including autonomous driving, vehicle-to-everything (V2V) technology needs to support URLLC (Ultra-URL Communication). However, existing V2V communication uses very few antennas (e.g., 1-2) and is half-duplex, meaning only one user's data can be transmitted on a given resource. Furthermore, it requires additional sensing-based semi-persistent scheduling (sensing-based SPS) to ensure each user transmits on a different time-frequency resource, which is detrimental to URLLC implementation. Especially in high-density scenarios, sensing-based SPS cannot guarantee transmission performance.

[0028] This application provides a mobile communication network (including but not limited to 5G) suitable for vehicle-to-everything (V2X) scenarios. The network architecture of this network may include terminal devices and access network devices. The terminal devices connect to the access network devices wirelessly and can be fixed or mobile. This application provides a full-duplex antenna applicable to the above-mentioned network architecture. It employs multi-receiver antenna technology, increasing the number of supported users and effectively suppressing antenna self-interference. Simultaneously, the full-duplex technology enables simultaneous data transmission and reception, significantly improving spectral efficiency and reducing transmission latency.

[0029] Access network equipment is an access device that enables terminal devices to wirelessly access the mobile communication system. It can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a 5G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system; it can also be a module or unit that performs some of the functions of a base station, such as a central unit (CU) or a distributed unit (DU). The embodiments in this application do not limit the specific technology or device form used in the access network equipment. In this application, access network equipment can be abbreviated as network equipment; unless otherwise specified, network equipment refers to access network equipment.

[0030] Terminal equipment can also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal, etc. Terminal equipment can be a mobile phone, tablet computer, computer with wireless transceiver capabilities, virtual reality terminal device, augmented reality terminal device, wireless terminal in industrial control, wireless terminal in autonomous driving, wireless terminal in remote surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc. The embodiments of this application do not limit the specific technology or device form used in the terminal equipment.

[0031] The following describes the full-duplex antenna, communication node, and their technical effects.

[0032] This application provides a full-duplex antenna, including: a transmitting antenna, N receiving antenna groups, and N radio frequency links. The receiving antenna groups are connected one-to-one with the radio frequency links. Each receiving antenna group includes at least two receiving antennas, and N is an integer greater than or equal to 2. The radio frequency links are configured to acquire a first signal received by all receiving antennas in the receiving antenna groups connected to the radio frequency links, and synthesize a second signal based on the first signal. The power of the self-interference signal associated with the transmitting antenna in the full-duplex transmission mode of the first signal is a first power, and the power of the self-interference signal associated with the transmitting antenna in the full-duplex transmission mode of the second signal is a second power. The second power is less than any of the first powers.

[0033] The full-duplex antenna provided in this application uses multi-antenna technology at the receiving end, dividing the receiving antenna into N receiving antenna groups, each receiving antenna group forming a fixed receiving beam. Figure 1The diagram illustrates a receiving beamformation formed by a receiving antenna group according to an embodiment. It is assumed that the receiving antenna group includes two receiving antennas, and the receiving beamform of the receiving antenna group is as follows: Figure 1 As shown in the shaded area. It can be seen that when the transmitting antenna is exactly in the region of minimum energy of the receiving beam of the receiving antenna array (such as...), Figure 1 At 0° and 180°, the self-interference generated by the transmitting antenna to the receiving antenna group can cancel each other out, achieving the effect of suppressing self-interference. Meanwhile, in the far-field ranges of 45° to 135° and 215° to 305°, the reception effect of the receiving antenna group is greater than or equal to that of a single antenna. Therefore, the receiving antenna group can eliminate self-interference within the group without affecting the reception coverage at other locations.

[0034] Figure 2a A schematic diagram of the energy coverage simulation results of a conventional antenna provided in one embodiment is shown. Figure 2b A schematic diagram of the energy coverage simulation results of the full-duplex antenna of this application provided in one embodiment is shown. Figure 2c A comparison diagram of self-interference suppression between a conventional antenna provided in one embodiment and the full-duplex antenna of this application is shown. Assuming the simulated coverage area is a 100m x 100m square, the conventional antenna structure consists of four receiving antennas deployed at the four corners of a 1m x 1m square in the center of the simulated area, with the transmitting antenna located in the center of the 1m x 1m square. The full-duplex antenna structure of this application consists of four receiving antenna groups deployed at the four corners of a 1m x 1m square in the center of the simulated area, each receiving antenna group comprising two receiving antennas, with the transmitting antenna located in the center of the 1m x 1m square. Figure 2c for Figure 2b The simulation results minus Figure 2a The simulation results show that there is gain over most of the range, with less than 0.5 dB of attenuation on the diagonal. (Comparison) Figures 2a-2c It can be seen that when the transmitting antenna is exactly in the region of minimum energy of the receiving beam of the receiving antenna group, the self-interference phenomenon generated by the transmitting antenna to the receiving antenna group can cancel each other out, thus achieving the effect of suppressing self-interference.

[0035] For details, please refer to Figure 3 , Figure 3 A schematic diagram of a full-duplex antenna according to one embodiment is shown. The full-duplex antenna includes: one transmitting antenna 100 and N receiving antenna groups (in... Figure 3 The data are labeled as receiving antenna group 1 201, receiving antenna group 2 202, ..., receiving antenna group N-1 20N-1, receiving antenna group N 20N, and N RF links (in...). Figure 3The following are labeled as RF Link 1 301, RF Link 2 302, ..., RF Link N-1 30N-1, RF Link N 30N respectively. In full-duplex transmission mode, the transmitting antenna 100 will cause self-interference to the N receiving antenna groups.

[0036] In one embodiment, N is an even number greater than or equal to 2. When N is an even number greater than or equal to 2, the design of the full-duplex antenna can meet the symmetry requirement and achieve better suppression of antenna self-interference.

[0037] Each receiving antenna group includes at least two receiving antennas, where N is an integer greater than or equal to 2. Figure 3 Taking the full-duplex antenna shown as an example, each receiving antenna group includes at least two receiving antennas, which can include either of the following two cases: (1) The number of receiving antennas in each of the N receiving antenna groups is equal, which is M, where M is an integer greater than or equal to 2; (2) The number of receiving antennas in each of the N receiving antenna groups is greater than or equal to 2, but the number of receiving antennas in different receiving antenna groups can be different, for example... Figure 3 The receiving antenna group 1 201 and receiving antenna group 2 202 shown each include 2 receiving antennas, and receiving antenna group N-1 20N-1 and receiving antenna group N 20N each include 3 receiving antennas.

[0038] In one embodiment, in case (1) above, M can be an even number greater than or equal to 2, so that the design of the full-duplex antenna is more likely to meet the symmetry requirement.

[0039] The receiving antenna array is connected to the RF link one by one (e.g. Figure 3 In the diagram, receiving antenna group 1 201 is connected to RF link 1 301, receiving antenna group 2 202 is connected to RF link 2 302, ..., receiving antenna group N-1 20N-1 is connected to RF link N-1 30N-1, and receiving antenna group N 20N is connected to RF link N 30N. The RF link is configured to acquire the first signal received by all receiving antennas in the receiving antenna groups connected to the RF link, and synthesize a second signal based on the first signal. The power of the self-interference signal associated with the transmitting antenna in full-duplex transmission mode is the first power, and the power of the self-interference signal associated with the transmitting antenna in full-duplex transmission mode is the second power. The second power is less than any of the first powers; ideally, the second power is 0. Assume... Figure 3 The receiving antenna group 1 201 shown includes two receiving antennas. The radio frequency link 1 301 connected to the receiving antenna group 1 201 can acquire the two first signals received by the two receiving antennas and synthesize them into a second signal.

[0040] In one embodiment, the transmitting antenna 100 is located within the intersection region of the minimum energy regions of the receiving beams of the N receiving antenna groups. This ensures that self-interference signals associated with the transmitting antenna 100 can cancel each other out, achieving the effect of suppressing self-interference.

[0041] In one embodiment, the transmitting antenna 100 may be selected, but is not limited to, any of the following locations:

[0042] The transmitting antenna 100 is located at the intersection of the perpendicular bisectors of the N receiving antenna groups; or...

[0043] The transmitting antenna 100 is located at the midpoint of the N receiving antenna groups; or,

[0044] The transmitting antenna 100 is located at the intersection of the extension lines of the antennas connecting the N receiving antenna groups.

[0045] In one embodiment, for the j-th receiving antenna group in N receiving antenna groups and the radio frequency link connected to the j-th receiving antenna group, the j-th receiving antenna group includes M receiving antennas, 1≤j≤N, M≥2;

[0046] The second signal y formed by the j-th receiving antenna combination j =v j，1 y j，1 +v j，2 y j，2 +…+v j,M y j,M y j ∈C L×1 ;

[0047] Among them, y j，1 Let y be the first signal received by the first receiving antenna in the j-th receiving antenna group. j，2 Let y be the first signal received by the second receiving antenna in the j-th receiving antenna group, ..., y j，M The first signal received by the Mth receiving antenna within the j-th receiving antenna group; v j，1 v is the combining coefficient corresponding to the first receiving antenna in the j-th receiving antenna group. j，2 Let v be the combining coefficient corresponding to the second receiving antenna in the j-th receiving antenna group, ..., v j,M is the combining coefficient corresponding to the Mth receiving antenna in the jth receiving antenna group;

[0048] Where C is a complex label, L is the length of the second signal, and C L×1 Let L represent a set of complex vectors of length L.

[0049] In one embodiment, the merging coefficient is a complex number, including amplitude and phase; the amplitude of the merging coefficient is a fixed value or adjustable; the phase of the merging coefficient is a fixed value or adjustable.

[0050] In one embodiment, if at least one of the amplitude and phase of the merging coefficient is adjustable,

[0051] The radio frequency link uses a reference signal transmitted by the transmitting antenna 100 to adjust at least one of the amplitude and phase of the combining coefficients by minimizing the self-interference signal strength; or,

[0052] The radio frequency link uses the data signal transmitted by the transmitting antenna 100, or the data signal and the reference signal, to adjust at least one of the amplitude and phase of the combining coefficients by calculating the residual self-interference signal strength; or,

[0053] The radio frequency link uses a reference signal transmitted by the transmit antenna 100 to adjust at least one of the amplitude and phase of the combining coefficients by a method of estimating the channel antenna by antenna.

[0054] In one embodiment, if the amplitude and phase of the merging coefficients are fixed values,

[0055] When the transmitting antenna 100 is located at the intersection of the perpendicular bisectors of N receiving antenna groups, and N is an even number, and each receiving antenna group includes 2 receiving antennas, v j，1 =-v j，2 ;or,

[0056] When the transmitting antenna 100 is located at the midpoint of N receiving antenna groups, and N is an even number, and each receiving antenna group includes 2 receiving antennas, v j，1 =-v j，2 ;or,

[0057] When the transmitting antenna 100 is located at the midpoint of N receiving antenna groups, and N is an even number, and each receiving antenna group includes 4 receiving antennas, v j，1 =-v j，4 v j，2 =-v j，3 ;or,

[0058] When the transmitting antenna 100 is located at the intersection of the extension lines of the antennas of N receiving antenna groups, and N is an even number, each receiving antenna group includes 2 receiving antennas, and the spacing between the 2 receiving antennas is equal to (P + 0.5) times the wavelength of the full-duplex antenna, v j，1 =v j，2 P is a non-negative integer.

[0059] In one embodiment, N second signals formed by N receiving antennas are combined through inter-group merging to obtain K data estimation signals, which are used to perform demodulation and decoding.

[0060] In one embodiment, N second signals Y = [y1, y2, ..., y3] are provided. N ] T ∈C N×L After inter-group merging, K estimated signals X = WY, W ∈ C are obtained. K×L ;or,

[0061] N second signals Y = [y1, y2, ..., y N ] T ∈C N×L Using the transmitted signal X on the transmitting antenna 100 SI Self-interference cancellation yields Y', which, after inter-group merging, results in K estimated data signals X = WY', W ∈ C. K×L ;or,

[0062] N second signals Y = [y1, y2, ..., y N ] T ∈C N×L After performing self-interference cancellation and continuous interference cancellation sequentially, Y” is obtained. After inter-group merging, K data estimation signals X = WY”, W∈C are obtained. K×L ;

[0063] Wherein, the transmitted signal is a data signal or a reference signal, C is a complex label, L is the length of the second signal, and C K×L Let K represent the set of complex matrices of size K×L.

[0064] In one embodiment, successive interference cancellation is symbol-level, or successive interference cancellation is codeword-level.

[0065] The following are some exemplary implementations used to illustrate the full-duplex antenna provided in the embodiments of this application.

[0066] In the first exemplary embodiment, Figure 4 A schematic diagram of another full-duplex antenna provided in one embodiment is shown, wherein the full-duplex antenna includes: one transmitting antenna, four receiving antenna groups, and four radio frequency links (also known as RF chains). Figure 4 (Not shown in the diagram), each receiving antenna group consists of two receiving antennas. All receiving antennas within a receiving antenna group share a single RF link. Since the cost of multiple antennas is mainly concentrated in the RF link, the scheme of sharing a single RF link within a receiving antenna group can save on antenna manufacturing costs. The transmitting antenna is located at the intersection of the perpendicular bisectors of the four receiving antenna groups, meaning that the two receiving antennas in a receiving antenna group are equidistant from the transmitting antenna. Ideally, the self-interference signal related to the transmitting antenna in the first signal received by these two receiving antennas is in phase. At this time, the second signal formed by the first receiving antenna group is... The second signal formed by the combination of the second receiving antenna is The second signal formed by the combination of the third receiving antenna is y3 = v 3，1 y 3，1 +v 3，2 y 3，2 The second signal formed by the combination of the fourth receiving antenna is y4 = v 4，1 y 4，1 +v 4，2 y 4，2 , where v 1，1 =-v 1，2 v 2，1 =-v 2，2 v 3，1 =-v 3，2 v 4，1 =-v 4，2 That is, it is only necessary to combine the first signal received by the two receiving antennas in the same group into a second signal to achieve the effect of suppressing self-interference signals.

[0067] Meanwhile, performing analog-to-digital converter (ADC) quantization on the second signal after self-interference suppression can prevent the ADC from needing to quantize a large range due to excessive power of the self-interference signal, thus resulting in low resolution for quantizing the effective signal.

[0068] In practice, due to factors such as antenna placement accuracy and multipath propagation of self-interference channels, signals arriving at the same receiving antenna group cannot achieve perfect amplitude and phase equality, and may even have amplitude differences, thus making it impossible to perfectly eliminate self-interference. To improve the effect of self-interference elimination, at least one of the following two measures can be adopted: (1) adjustable coefficient; (2) digital elimination. Adjustable coefficient means that the merging coefficient is no longer a fixed coefficient, but is controlled by a program, thereby achieving a more accurate self-interference suppression effect; digital elimination is to perform digital domain operations on the received signal after merging and quantizing within the group to achieve self-interference elimination: since the data symbols of the self-interference signal are known, the channel of self-interference in the residual self-interference signal can be estimated through these data symbols, and then the residual self-interference received signal can be reconstructed through the self-interference data symbols and the estimated residual self-interference channel, and then eliminated on the received signal.

[0069] In addition to self-interference cancellation Figure 4The full-duplex antenna shown can also support multi-user transmission. The first user's transmitting antenna transmits signals in all directions, and this transmitted signal is self-interference for the first user. After the self-interference signal reaches the first user's multiple receiving antenna groups, it is suppressed through antenna combining within each group. However, the transmitted signals of other users besides the first user are not suppressed in any of the first user's receiving antenna groups. Thus, after combining within the four receiving antenna groups, four second signals are obtained, and different users have different equivalent channel coefficients on these four second signals. This can be viewed as a four-antenna Multiple-Input Single-Output (MISO) system reception. Spatial combining can suppress multi-user interference, thereby achieving multi-user transmission. Furthermore, to increase the number of users supported by the receiver, continuous interference cancellation technology can be used to reduce multi-user interference. Depending on the multi-user proximity effect and channel quality, continuous interference cancellation can be at the symbol level or the codeword level.

[0070] In the second exemplary embodiment, Figure 5 A schematic diagram of another full-duplex antenna provided in one embodiment is shown, wherein the full-duplex antenna includes: one transmitting antenna, two receiving antenna groups, and two radio frequency links (also known as RF chains). Figure 5 (Not shown in the diagram), each receiving antenna group consists of two receiving antennas. All receiving antennas within a receiving antenna group share a single radio frequency (RF) link. Since the cost of multiple antennas is mainly concentrated in the RF link, the scheme of sharing a single RF link within a receiving antenna group can save on antenna manufacturing costs. The transmitting antenna is located at the midpoint of the two receiving antenna groups, meaning that the amplitude and distance from the two receiving antennas in a receiving antenna group to the transmitting antenna are equal. Ideally, the self-interference signal related to the transmitting antenna in the first signal received by these two receiving antennas is in phase. At this time, the second signal formed by the first receiving antenna group is y1 = v 1，1 y 1，1 +v 1，2 y 1，2 The second signal formed by the combination of the second receiving antenna is y2 = v 2，1 y 2，1 +v 2，2 y 2，2 , where v 1，1 =-v 1，2 v 2，1 =-v 2，2 That is, it is only necessary to combine the first signal received by the two receiving antennas in the same group into a second signal to achieve the effect of suppressing self-interference signals.

[0071] Meanwhile, performing ADC quantization on the second signal after self-interference suppression can prevent the ADC from needing to quantize a large range due to excessive power of the self-interference signal, thus resulting in low resolution for quantizing the effective signal.

[0072] In practice, due to factors such as antenna placement accuracy and multipath propagation of self-interference channels, signals arriving at the same receiving antenna group cannot achieve perfect amplitude and phase equality, and may even have amplitude differences, thus making it impossible to perfectly eliminate self-interference. To improve the effect of self-interference elimination, at least one of the following two measures can be adopted: (1) adjustable coefficient; (2) digital elimination. Adjustable coefficient means that the merging coefficient is no longer a fixed coefficient, but is controlled by a program, thereby achieving a more accurate self-interference suppression effect; digital elimination is to perform digital domain operations on the received signal after merging and quantizing within the group to achieve self-interference elimination: since the data symbols of the self-interference signal are known, the channel of self-interference in the residual self-interference signal can be estimated through these data symbols, and then the residual self-interference received signal can be reconstructed through the self-interference data symbols and the estimated residual self-interference channel, and then eliminated on the received signal.

[0073] In addition to self-interference cancellation Figure 5 The full-duplex antenna shown can also support multi-user transmission. The first user's transmitting antenna transmits signals in all directions, and this transmitted signal is self-interference for the first user. After the self-interference signal reaches the first user's multiple receiving antenna groups, it is suppressed through antenna combining within each group. However, the transmitted signals of other users besides the first user are not suppressed in any of the first user's receiving antenna groups. Thus, after combining within two receiving antenna groups, two second signals are obtained, and different users have different equivalent channel coefficients on these two second signals. This can be considered as two-antenna MISO reception. Spatial combining can suppress multi-user interference, thereby achieving multi-user transmission. Furthermore, to increase the number of users supported by the receiver, continuous interference cancellation technology can be used to reduce multi-user interference. Depending on the multi-user proximity effect and channel quality, continuous interference cancellation can be at the symbol level or the codeword level.

[0074] In the third exemplary embodiment, Figure 6 A schematic diagram of another full-duplex antenna provided in one embodiment is shown, wherein the full-duplex antenna includes: one transmitting antenna, four receiving antenna groups, and four radio frequency links (also known as RF chains). Figure 6(Not shown in the diagram), each receiving antenna group consists of 4 receiving antennas. All receiving antennas within a receiving antenna group share a single RF link. Since the cost of multiple antennas is mainly concentrated in the RF link, the scheme of sharing a single RF link within a receiving antenna group can save on antenna manufacturing costs. The transmitting antenna is located at the midpoint of the 4 receiving antenna groups. That is, the amplitude and distance from the two outer receiving antennas in a receiving antenna group to the transmitting antenna are equal. Ideally, the self-interference signal related to the transmitting antenna in the first signal received by these two receiving antennas is in phase. Similarly, the amplitude and distance from the two inner receiving antennas in a receiving antenna group to the transmitting antenna are equal. Ideally, the self-interference signal related to the transmitting antenna in the first signal received by these two receiving antennas is in phase. At this time, the second signal formed by the first receiving antenna group is... The second signal formed by the combination of the second receiving antenna is y2 = v 2，1 y 2，1 +v 2，2 y 2，2 +v 2，3 y 2，3 +v 2，4 y 2，4 The second signal formed by the combination of the third receiving antenna is The second signal formed by the combination of the fourth receiving antenna is y4 = v 4，1 y 4，1 +v 4，2 y 4，2 +v 4，3 y 4，3 +v 4，4 y 4，4 , where v 1，1 =-v 1，4 v 1，2 =-v 1，3 v 2，1 =-v 2，4 v 2，2 =-v 2，3 v 3，1 =-v 3，4 v 3，2 =-v 3，3 v 4，1 =-v 4，4 v 4，2 =-v 4，3 That is, it is only necessary to combine the first signal received by the four receiving antennas in the same group into a second signal to achieve the effect of suppressing self-interference signals.

[0075] Meanwhile, performing ADC quantization on the second signal after self-interference suppression can prevent the ADC from needing to quantize a large range due to excessive power of the self-interference signal, thus resulting in low resolution for quantizing the effective signal.

[0076] In practice, due to factors such as antenna placement accuracy and multipath propagation of self-interference channels, signals arriving at the same receiving antenna group cannot achieve perfect amplitude and phase equality, and may even have amplitude differences, thus making it impossible to perfectly eliminate self-interference. To improve the effect of self-interference elimination, at least one of the following two measures can be adopted: (1) adjustable coefficient; (2) digital elimination. Adjustable coefficient means that the merging coefficient is no longer a fixed coefficient, but is controlled by a program, thereby achieving a more accurate self-interference suppression effect; digital elimination is to perform digital domain operations on the received signal after merging and quantizing within the group to achieve self-interference elimination: since the data symbols of the self-interference signal are known, the channel of self-interference in the residual self-interference signal can be estimated through these data symbols, and then the residual self-interference received signal can be reconstructed through the self-interference data symbols and the estimated residual self-interference channel, and then eliminated on the received signal.

[0077] In addition to self-interference cancellation Figure 6 The full-duplex antenna shown can also support multi-user transmission. The first user's transmitting antenna transmits signals in all directions, and this transmitted signal is self-interference for the first user. After the self-interference signal reaches the first user's multiple receiving antenna groups, it is suppressed through antenna combining within each group. However, the transmitted signals of other users besides the first user are not suppressed in any of the first user's receiving antenna groups. Thus, after combining within the four receiving antenna groups, four second signals are obtained, and different users have different equivalent channel coefficients on these four second signals. This can be considered as a four-antenna MISO reception. Spatial combining can suppress multi-user interference, thereby achieving multi-user transmission. Furthermore, to increase the number of users supported by the receiver, continuous interference cancellation technology can be used to reduce multi-user interference. Depending on the multi-user proximity effect and channel quality, continuous interference cancellation can be at the symbol level or the codeword level.

[0078] In the fourth exemplary embodiment, Figure 7 A schematic diagram of another full-duplex antenna provided in one embodiment is shown, wherein the full-duplex antenna includes: one transmitting antenna, four receiving antenna groups, and four radio frequency links (also known as RF chains). Figure 7(Not shown in the diagram), each receiving antenna group consists of 2 receiving antennas. All receiving antennas within a receiving antenna group share a single radio frequency (RF) link. Since the cost of multiple antennas is mainly concentrated in the RF link, the scheme of sharing a single RF link within a receiving antenna group can save on antenna manufacturing costs. The transmitting antenna is located at the intersection of the extension lines connecting the antennas of the four receiving antenna groups. When the spacing between the two receiving antennas in each receiving antenna group is equal to (P + 0.5) times the wavelength λ of the full-duplex antenna (i.e., Pλ + λ / 2), where P is a non-negative integer, ideally, the self-interference signal related to the transmitting antenna in the first signal received by the two receiving antennas in the same group is out of phase. At this time, the second signal formed by the first receiving antenna group is y1 = v 1，1 y 1，1 +v 1，2 y 1，2 The second signal formed by the combination of the second receiving antenna is y2 = v 2，1 y 2，1 +v 2，2 y 2，2 The second signal formed by the combination of the third receiving antenna is y3 = v 3，1 y 3，1 +v 3，2 y 3，2 The second signal formed by the combination of the fourth receiving antenna is y4 = v 4，1 y 4，1 +v 4，2 y 4，2 , where v 1，1 =v 1，2 v 2，1 =v 2，2 v 3，1 =v 3，2 v 4，1 =v 4，2 That is, it is only necessary to combine the first signal received by the two receiving antennas in the same group into a second signal to achieve the effect of suppressing self-interference signals.

[0079] Meanwhile, performing ADC quantization on the second signal after self-interference suppression can prevent the ADC from needing to quantize a large range due to excessive power of the self-interference signal, thus resulting in low resolution for quantizing the effective signal.

[0080] In practice, due to factors such as antenna placement accuracy and multipath propagation of self-interference channels, signals arriving at the same receiving antenna group cannot achieve perfect amplitude and phase equality, and may even have amplitude differences, thus making it impossible to perfectly eliminate self-interference. To improve the effect of self-interference elimination, at least one of the following two measures can be adopted: (1) adjustable coefficient; (2) digital elimination. Adjustable coefficient means that the merging coefficient is no longer a fixed coefficient, but is controlled by a program, thereby achieving a more accurate self-interference suppression effect; digital elimination is to perform digital domain operations on the received signal after merging and quantizing within the group to achieve self-interference elimination: since the data symbols of the self-interference signal are known, the channel of self-interference in the residual self-interference signal can be estimated through these data symbols, and then the residual self-interference received signal can be reconstructed through the self-interference data symbols and the estimated residual self-interference channel, and then eliminated on the received signal.

[0081] In addition to self-interference cancellation Figure 7 The full-duplex antenna shown can also support multi-user transmission. The first user's transmitting antenna transmits signals in all directions, and this transmitted signal is self-interference for the first user. After the self-interference signal reaches the first user's multiple receiving antenna groups, it is suppressed through antenna combining within each group. However, the transmitted signals of other users besides the first user are not suppressed in any of the first user's receiving antenna groups. Thus, after combining within the four receiving antenna groups, four second signals are obtained, and different users have different equivalent channel coefficients on these four second signals. This can be considered as a four-antenna MISO reception. Spatial combining can suppress multi-user interference, thereby achieving multi-user transmission. Furthermore, to increase the number of users supported by the receiver, continuous interference cancellation technology can be used to reduce multi-user interference. Depending on the multi-user proximity effect and channel quality, continuous interference cancellation can be at the symbol level or the codeword level.

[0082] In the fifth exemplary embodiment, Figure 8 A schematic diagram of yet another full-duplex antenna provided in one embodiment is shown, wherein the full-duplex antenna includes: one transmitting antenna, six receiving antenna groups, and six radio frequency links (also known as RF chains). Figure 8 (Not shown in the diagram), each receiving antenna group includes two receiving antennas. All receiving antennas within a receiving antenna group share a single radio frequency (RF) link. Since the cost of multiple antennas is mainly concentrated in the RF link, the scheme of sharing a single RF link within the receiving antenna group can save on antenna manufacturing costs. The transmitting antenna is located at any position among the six receiving antenna groups (e.g., ...). Figure 8 The transmitting antenna shown is located at the intersection of the connecting lines of the three pairs of receiving antenna groups: the upper left and lower right, the lower left and upper right, and the middle and upper-lower. At this time, the second signal formed by the first receiving antenna combination is y1 = v. 1，1 y1，1 +v 1，2 y 1，2 The second signal formed by the combination of the second receiving antenna is y2 = v 2，1 y 2，1 +v 2，2 y 2，2 The second signal formed by the combination of the third receiving antenna is y3 = v 3， 1y 3，1 +v 3，2 y 3，2 The second signal formed by the combination of the fourth receiving antenna is y4 = v 4，1 y 4，1 +v 4，2 y 4，2 The second signal formed by the combination of the fifth receiving antenna is y5 = v 5，1 y 5，1 +v 5，2 y 5，2 The second signal formed by the combination of the 6th receiving antenna is y6 = v 6，1 y 6，1 +v 6， 2y 6，2 This means that the first signal received by the two receiving antennas in the same group is combined into a second signal to suppress self-interference signals. Ideally, the combining coefficient can be fixed.

[0083] Meanwhile, performing ADC quantization on the second signal after self-interference suppression can prevent the ADC from needing to quantize a large range due to excessive power of the self-interference signal, thus resulting in low resolution for quantizing the effective signal.

[0084] In practice, due to factors such as antenna placement accuracy and multipath propagation of self-interference channels, signals arriving at the same receiving antenna group cannot achieve perfect amplitude and phase equality, and may even have amplitude differences, thus making it impossible to perfectly eliminate self-interference. To improve the effect of self-interference elimination, at least one of the following two measures can be adopted: (1) adjustable coefficient; (2) digital elimination. Adjustable coefficient means that the merging coefficient is no longer a fixed coefficient, but is controlled by a program, thereby achieving a more accurate self-interference suppression effect; digital elimination is to perform digital domain operations on the received signal after merging and quantizing within the group to achieve self-interference elimination: since the data symbols of the self-interference signal are known, the channel of self-interference in the residual self-interference signal can be estimated through these data symbols, and then the residual self-interference received signal can be reconstructed through the self-interference data symbols and the estimated residual self-interference channel, and then eliminated on the received signal.

[0085] In addition to self-interference cancellation Figure 8The full-duplex antenna shown can also support multi-user transmission. The first user's transmitting antenna transmits signals in all directions, and this transmitted signal is self-interference for the first user. After the self-interference signal reaches the first user's multiple receiving antenna groups, it is suppressed through antenna combining within each group. However, the transmitted signals of other users besides the first user are not suppressed in any of the first user's receiving antenna groups. Thus, after combining within the six receiving antenna groups, six second signals are obtained, and different users have different equivalent channel coefficients on these six second signals. This can be considered as a six-antenna MISO reception. Spatial combining can suppress multi-user interference, thereby achieving multi-user transmission. Furthermore, to increase the number of users supported by the receiver, continuous interference cancellation technology can be used to reduce multi-user interference. Depending on the multi-user proximity effect and channel quality, continuous interference cancellation can be at the symbol level or the codeword level.

[0086] In the sixth exemplary embodiment, Figure 9 This diagram illustrates an embodiment of a full-duplex antenna adjusting the combining coefficients by minimizing self-interference signal strength. Assuming the RF link connects two receiving antennas (i.e., a receiving antenna group includes two receiving antennas), the goal of adjusting the combining coefficients in the RF link is to suppress reference signals transmitted from the same user's transmitting antennas as much as possible after combining within the RF link group. In this exemplary embodiment, the same user's transmitting antennas transmit reference signals, and the RF link combines them using preset or random combining coefficients, resulting in y = v1y1 + v2y2. The combining coefficients v1 and v2 are adjusted by feeding back the energy of the combined signal within the group, thereby minimizing |y|, where |·| is the L2 norm sign. During this process, the same user's transmitting antennas may need to transmit the reference signal more than once for |y| to converge to a sufficiently small value.

[0087] In the seventh exemplary embodiment, Figure 10 This illustration shows a schematic diagram of a full-duplex antenna adjusting the combining coefficients using an antenna-by-antenna channel estimation method, according to one embodiment. Assuming the RF link connects two receiving antennas (i.e., a receiving antenna group includes two receiving antennas), the goal of adjusting the combining coefficients in the RF link is to suppress reference signals transmitted from the same user's transmit antennas as much as possible after combining within the RF link group. In this exemplary embodiment, the same user's transmit antennas transmit reference signals, and the RF link obtains the channel coefficients on different antennas by switching the antenna connections. and Then, the combining coefficients v1 and v2 are calculated using the channel coefficients.

[0088] In the eighth exemplary embodiment, Figure 11This diagram illustrates an embodiment of a full-duplex antenna adjusting the combining coefficients by calculating the strength of residual self-interference signals. Assuming the RF link connects two receiving antennas (i.e., a receiving antenna group includes two receiving antennas), the goal of adjusting the combining coefficients in the RF link is to suppress reference signals or data signals transmitted from the same user's transmitting antennas as much as possible after combining within the RF link group. In this exemplary embodiment, the same user's transmitting antennas transmit reference signals or data signals and reference signals. The RF link combines these signals using a preset combining coefficient, resulting in y = v1y1 + v2y2. Simultaneously, information such as the energy and channel of residual self-interference can be calculated using the reference signals or data signals and the combined signal within the group, and this information is fed back to the RF link for adjusting the combining coefficients v1 and v2.

[0089] In the ninth exemplary embodiment, Figure 12 This diagram illustrates an embodiment of a full-duplex antenna that combines N second signals to obtain K data estimation signals. Assuming the full-duplex antenna comprises N receiving antenna groups, each group containing two receiving antennas, after combining the N second signals within each group, further inter-group combining is required to obtain the data estimation. Inter-group combining also helps suppress self-interference signals. Assuming K combined signals are used to compare the N second signals Y = [y1, y2, ..., y...] N ] T ∈C N×L By merging these signals, we obtain K estimated signals X = WY, W ∈ C. K×L These estimated data are then sent to the demodulation and decoding module. After verification by Cyclic Redundancy Check (CRC), the data signal that passes the check is obtained. Generally, the data signal that passes the check is considered the correctly demodulated data signal.

[0090] In the tenth exemplary embodiment, Figure 13 This diagram illustrates another embodiment of a full-duplex antenna that combines N second signals to obtain K data estimation signals. Assuming the full-duplex antenna comprises N receiving antenna groups, each group containing two receiving antennas, after combining the N second signals within each group, further inter-group combining is required to obtain the data estimation. Inter-group combining also helps suppress self-interference signals. Optionally, self-interference data packets can be used for self-interference cancellation. Specifically, the transmitted signal X on the transmitting antenna... SI To perform channel estimation, and then based on the channel estimation and the transmitted signal X SIThe interference signal is reconstructed, and finally the reconstructed self-interference signal is eliminated in the second signal. Assume that K signals are combined and compared with N second signals Y = [y1, y2, ..., y]. N ] T ∈C N×L By merging these signals, we obtain K estimated signals X = WY', W ∈ C. K×L The transmitted signal is either a data signal or a reference signal. These data estimates are sent to the demodulation and decoding module, and after CRC verification, the data signal that passes the verification is obtained. Generally, the data signal that passes the verification is considered the correctly demodulated data signal.

[0091] In the eleventh exemplary embodiment, Figure 14 This illustration shows a schematic diagram of another full-duplex antenna embodiment that combines N second signals to obtain K data estimation signals. Assuming the full-duplex antenna includes N receiving antenna groups, each group containing two receiving antennas, after combining N second signals within each group, further inter-group combining is needed to obtain the data estimation. Inter-group combining also helps suppress self-interference signals. Optionally, self-interference data packets can be used for self-interference cancellation. Specifically, channel estimation is performed using reference signals, data symbols, or both reference signals and data symbols in the data packets. Then, the interference signal is reconstructed based on the channel estimation and the data packets. Finally, the reconstructed self-interference signal is eliminated from the second signals. Assuming K combining and comparison of N second signals Y = [y1, y2, ..., y...] is used... N ] T ∈C N×L By merging these signals, we obtain K estimated signals X = WY”, W∈C. K×L These estimated data are then sent to the demodulation and decoding module. After CRC verification, the data signal that passes the verification can be obtained. Generally, the data signal that passes the verification is considered the correctly demodulated data signal.

[0092] In this exemplary embodiment, after accurately demodulating a portion of the data signal, these signals need to be sent to the interference cancellation module for re-merging, demodulation, decoding, and CRC verification. This step is repeated continuously until no new data signal can pass the CRC check. This step is called continuous interference cancellation. Figure 14In the continuous interference cancellation shown, not only the verified data signal but also information from self-interference data packets can be utilized simultaneously. If continuous interference cancellation utilizes both the verified data signal and the self-interference cancellation signal, the self-interference cancellation step can be omitted, as its function can be fully contained within the continuous interference cancellation step. Furthermore, during continuous interference cancellation, the reference signal portion can also be cancelled to improve the accuracy of channel estimation in each round. This method is used in schemes based on non-orthogonal pilot reference signals.

[0093] In the first to fifth exemplary embodiments described above, several antenna deployment methods are shown, and the intra-group combining coefficient can be initially determined based on the antenna deployment. Ideally, this combining coefficient does not require adjustment. In the sixth to eighth exemplary embodiments described above, considering the influence of non-ideal factors, several methods for adjusting the intra-group combining coefficient are shown. These non-ideal factors include the physical precision of the antenna deployment, differences in multipath propagation between antenna channels within the same group, and hardware defects. When the effect of non-ideal factors is minor, the sixth to eighth exemplary embodiments may not be implemented. In the ninth to eleventh exemplary embodiments described above, several methods for processing and combining the second signal are shown, ultimately yielding the required data estimate for demodulation and decoding.

[0094] This application provides a full-duplex antenna, comprising: one transmitting antenna, N receiving antenna groups, and N radio frequency links. Each receiving antenna group is connected to one of the radio frequency links, and each receiving antenna group includes at least two receiving antennas. N is an integer greater than or equal to 2. The radio frequency links are configured to acquire a first signal received by all receiving antennas in the receiving antenna groups connected to the radio frequency link, and synthesize a second signal based on the first signal. The power of the self-interference signal associated with the transmitting antenna in full-duplex transmission mode is a first power, and the power of the self-interference signal associated with the transmitting antenna in full-duplex transmission mode is a second power. The second power is less than any of the first powers. By employing multi-receiving antenna technology, the number of supported users is increased, antenna self-interference is effectively suppressed, and simultaneous data transmission and reception using full-duplex technology significantly improves spectral efficiency and reduces transmission latency.

[0095] This application also provides a communication device, including a full-duplex antenna having the features of any of the above embodiments. Specifically, this device can be a terminal device provided in any embodiment of this application, or an access network device provided in any embodiment of this application; this application does not impose specific limitations in this regard.

[0096] For example, the following embodiment provides a schematic diagram of the structure of a communication device (UE).

[0097] Figure 15 The illustration shows a schematic diagram of a UE provided in one embodiment. The UE can be implemented in various forms. The UE in this application can include, but is not limited to, mobile terminal devices such as mobile phones, smartphones, laptops, digital broadcast receivers, personal digital assistants (PDAs), tablet computers (PADs), portable media players (PMPs), navigation devices, in-vehicle terminal devices, in-vehicle display terminals, in-vehicle electronic rearview mirrors, etc., as well as fixed terminal devices such as digital television (TV), desktop computers, etc.

[0098] like Figure 15 As shown, UE 50 may include a wireless communication unit 51, an audio / video (A / V) input unit 52, a user input unit 53, a sensing unit 54, an output unit 55, a memory 56, an interface unit 57, a processor 58, and a power supply unit 59, etc. Figure 15 The UE shown includes a variety of components; however, it should be understood that it is not required to implement all of the components shown. More or fewer components may be implemented alternatively.

[0099] In this embodiment, the wireless communication unit 51 allows the UE 50 to communicate wirelessly with a base station or network. The A / V input unit 52 is configured to receive audio or video signals. The user input unit 53 can generate key input data to control various operations of the UE 50 based on user-input commands. The sensing unit 54 detects the current state of the UE 50, the position of the UE 50, the presence or absence of user touch input to the UE 50, the orientation of the UE 50, the acceleration or deceleration of the UE 50, and its direction, etc., and generates commands or signals for controlling the operation of the UE 50. The interface unit 57 serves as an interface through which at least one external device can connect to the UE 50. The output unit 55 is configured to provide output signals in a visual, audio, and / or tactile manner. The memory 56 can store software programs, etc., that perform processing and control operations executed by the processor 58, or can temporarily store data that has been output or will be output. The memory 56 can include at least one type of storage medium. Moreover, the UE 50 can cooperate with a network storage device that performs the storage function of the memory 56 via a network connection. Processor 58 typically controls the overall operation of UE 50. Power supply unit 59, under the control of processor 58, receives external or internal power and provides the appropriate power required to operate various components and assemblies.

[0100] The processor 58 performs at least one functional application and data processing by running a program stored in the memory 56.

[0101] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the methods disclosed in any embodiment of this application.

[0102] The computer storage medium in this application embodiment can be any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. For example, a computer-readable storage medium can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. Computer-readable storage media include (a non-exhaustive list): electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), electrically erasable, programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this application, the computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0103] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, the data signals carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0104] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wire, optical fiber, radio frequency (RF), or any suitable combination thereof.

[0105] Computer program code for performing the operations of this disclosure can be written in one or more programming languages ​​or a combination of programming languages, including object-oriented programming languages ​​(such as Java, Smalltalk, C++, Ruby, and Go) and conventional procedural programming languages ​​(such as the "C" language or similar programming languages). The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network (including a Local Area Network (LAN) or a Wide Area Network (WAN)), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0106] Those skilled in the art will understand that the term user terminal encompasses any suitable type of wireless user equipment, such as mobile phones, portable data processing devices, portable web browsers, or vehicle-mounted mobile stations.

[0107] Generally, the various embodiments of this application can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although this application is not limited thereto.

[0108] Embodiments of this application can be implemented by executing computer program instructions through the data processor of a mobile device, for example, in a processor entity, or through hardware, or through a combination of software and hardware. The computer program instructions can be assembly instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages.

[0109] Any block diagram of logical flow in the accompanying drawings of this application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program may be stored in memory. The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical storage devices and systems (Digital Multifunction Discs, DVDs, or CDs), etc. Computer-readable media may include non-transitory storage media. The data processor may be of any type suitable to the local technical environment, such as, but not limited to, general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and processors based on multi-core processor architectures.

Claims

1. A full-duplex antenna, characterized in that, include: One transmitting antenna, N receiving antenna groups and N radio frequency links, wherein each receiving antenna group is connected to one of the radio frequency links, and each receiving antenna group includes at least two receiving antennas, and N is an integer greater than or equal to 2; The radio frequency link is configured to acquire a first signal received by all receiving antennas in the receiving antenna group connected to the radio frequency link, and synthesize a second signal based on the first signal. The power of the self-interference signal associated with the transmitting antenna in the full-duplex transmission mode of the first signal is a first power, and the power of the self-interference signal associated with the transmitting antenna in the full-duplex transmission mode of the second signal is a second power. The second power is less than any of the first powers. Each of the receiving antenna groups forms a receiving beam, and the transmitting antenna is located within the intersection region of the minimum energy regions of the receiving beams of the N receiving antenna groups.

2. The full-duplex antenna according to claim 1, characterized in that, The transmitting antenna is located at the intersection of the vertical bisectors of the N receiving antenna groups; or, The transmitting antenna is located at the midpoint of the N receiving antenna groups; or... The transmitting antenna is located at the intersection of the extension lines connecting the antennas of the N receiving antenna groups.

3. The full-duplex antenna according to claim 1, characterized in that, N is an even number greater than or equal to 2.

4. The full-duplex antenna according to claim 1, characterized in that, Each of the said receiving antenna groups includes M said receiving antennas, where M is an integer greater than or equal to 2.

5. The full-duplex antenna according to claim 4, characterized in that, M is an even number greater than or equal to 2.

6. The full-duplex antenna according to claim 1, characterized in that, For the j-th receiving antenna group among the N receiving antenna groups and the radio frequency link connected to the j-th receiving antenna group, the j-th receiving antenna group includes M receiving antennas, 1≤j≤N, M≥2; The second signal formed by the j-th receiving antenna combination , ; in, The first signal received by the first receiving antenna in the j-th receiving antenna group. The first signal received by the second receiving antenna in the j-th receiving antenna group, ... The first signal received by the Mth receiving antenna within the j-th receiving antenna group; The combining coefficient is the value corresponding to the first receiving antenna in the j-th receiving antenna group. Let be the combining coefficient corresponding to the second receiving antenna in the j-th receiving antenna group, ..., is the combining coefficient corresponding to the Mth receiving antenna in the jth receiving antenna group; in, For plural labels, The length of the second signal, Indicates length is A set of complex vectors.

7. The full-duplex antenna according to claim 6, characterized in that, The merging coefficients are complex numbers, including amplitude and phase; The amplitude of the merging coefficient is a fixed value or adjustable; the phase of the merging coefficient is a fixed value or adjustable.

8. The full-duplex antenna according to claim 7, characterized in that, If at least one of the amplitude and phase of the merging coefficient is adjustable, The radio frequency link uses a reference signal transmitted by the transmitting antenna to adjust at least one of the amplitude and phase of the combining coefficients by minimizing the self-interference signal strength; or, The radio frequency link uses the data signal transmitted by the transmitting antenna, or the data signal and the reference signal, to adjust at least one of the amplitude and phase of the combining coefficient by calculating the residual self-interference signal strength; or, The radio frequency link uses a reference signal transmitted by the transmitting antenna to adjust at least one of the amplitude and phase of the combining coefficients by a method of estimating the channel antenna by antenna.

9. The full-duplex antenna according to claim 7, characterized in that, If the amplitude and phase of the merging coefficient are fixed values, When the transmitting antenna is located at the intersection of the perpendicular bisectors of the N receiving antenna groups, and N is an even number, and each receiving antenna group includes 2 receiving antennas, ; or, When the transmitting antenna is located at the midpoint of N receiving antenna groups, and N is an even number, and each receiving antenna group includes 2 receiving antennas, ; or, When the transmitting antenna is located at the midpoint of N receiving antenna groups, and N is an even number, and each receiving antenna group includes 4 receiving antennas, , ; or, When the transmitting antenna is located at the intersection of the extension lines of the antennas of the N receiving antenna groups, and N is an even number, each receiving antenna group includes 2 receiving antennas, and the distance between the 2 receiving antennas is equal to (P + 0.5) times the wavelength of the full-duplex antenna, P is a non-negative integer.

10. The full-duplex antenna according to claim 6, characterized in that, The N second signals formed by the N receiving antennas are combined and then combined between groups to obtain K data estimation signals, which are used to perform demodulation and decoding.

11. The full-duplex antenna according to claim 10, characterized in that, N second signals After inter-group merging, K data estimation signals were obtained. ;or, N second signals Using the transmitted signal on the transmitting antenna Self-interference cancellation is obtained , After inter-group merging, K data estimation signals were obtained. ;or, N second signals After performing self-interference cancellation and continuous interference cancellation in sequence, the following is obtained: , After inter-group merging, K data estimation signals were obtained. ; The transmitted signal is either a data signal or a reference signal. For plural labels, The length of the second signal, express The set of complex matrices.

12. The full-duplex antenna according to claim 11, characterized in that, The continuous interference cancellation is symbol-level, or the continuous interference cancellation is codeword-level.

13. A communication node, characterized in that, Includes the full-duplex antenna as described in any one of claims 1-12.

Images