Antenna design method and device for enhanced isolation

Abstract

The present invention relates to an antenna design method and device for enhanced isolation. The antenna design method and device for enhanced isolation include an isolation network, including: a power divider, which is used to decompose a transmission signal into two first decomposed signals and second decomposed signals with the same power, a phase shifter, which is coupled to the power divider and performs phase shifting on the second decomposed signal, a first elimination module, which is coupled to the power divider, an antenna unit and a synthesizer; a second elimination module, which is coupled to the phase shifter, the antenna unit and the synthesizer; and a synthesizer, which is coupled to the first elimination module and the second elimination module to synthesize the first received signal and the second received signal.

Description

Technical Field

[0001] The invention relates to a method and a device for designing an antenna for enhancing isolation. Background Art

[0002] According to ITU estimates, by 2020, the global monthly mobile data traffic will reach 62 Exa Byte (1EB = 230GB), and from 2020 to 2030, global mobile data services will grow at an annual rate of about 55%. In addition, the proportion of video services and machine-to-machine communication services in mobile data services will gradually increase. In 2030, video services will be 6 times that of non-video services, and machine-to-machine communication services will account for about 12% of mobile data services ("IMT traffic estimates for the years 2020 to 2030, Report ITU-R M.2370-0").

[0003] The rapid growth of mobile data services, especially the exponential growth of high-definition video and ultra-high-definition video services, has put forward higher requirements on the transmission rate of wireless communications. In order to meet the growing demand for mobile services, people need to propose new technologies based on 4G or 5G to further improve the transmission rate and throughput of wireless communication systems.

[0004] The improvement of duplex technology is an important means to further improve the transmission rate and throughput of wireless communication systems. The duplex technology (including frequency division multiplexing (FDM) and time division multiplexing (TDM)) used by existing systems and protocols cannot fully utilize the available time and frequency resources, and its resource utilization efficiency is less than 50%. Summary of the invention

[0005] The present invention provides an isolation network, comprising: a power divider, which is used to decompose a transmission signal into a first decomposed signal and a second decomposed signal of two equal powers; a phase shifter, which is coupled to the power divider and performs phase shifting on the second decomposed signal; a first elimination module, which is coupled to the power divider, an antenna unit and a synthesizer, so as to receive the first decomposed signal from the power divider and output a first group of transmission signals to the antenna unit to stimulate the antenna unit to generate a first circularly polarized transmission signal; and receive a first group of reception signals from the antenna unit, generate a first reception signal and then output it to the synthesizer; a second elimination module, which is coupled to the phase shifter, the antenna unit and the synthesizer, so as to receive the phase-shifted second decomposed signal from the phase shifter and output a second group of transmission signals to the antenna unit to stimulate the antenna unit to generate a second circularly polarized transmission signal; and receive a second group of reception signals from the antenna unit, generate a second reception signal and then output it to the synthesizer; and a synthesizer, which is coupled to the first elimination module and the second elimination module to synthesize the first reception signal and the second reception signal.

[0006] Another aspect of the present invention provides an isolation network, wherein the first elimination module is configured to be coupled to two feed points on the antenna unit; and the second elimination module is configured to be coupled to another two feed points on the antenna unit.

[0007] Another aspect of the present invention provides an isolation network, wherein the phase shifter shifts the second decomposed signal by 90 degrees.

[0008] Another aspect of the present invention provides an isolation network, wherein the first group of transmission signals includes two transmission signals with a phase difference of 90 degrees; and the second group of transmission signals includes two transmission signals with a phase difference of 90 degrees.

[0009] Another aspect of the present invention provides an isolation network, wherein the first elimination module includes: a first power division network, which is coupled to the power divider to receive the first decomposition signal and generate a first group of circulator input signals, and the first group of circulators includes: a first group of input ports coupled to the first power division network to receive the first group of circulator input signals; a first group of antenna ports coupled to the antenna unit to output a first group of transmission signals to the antenna unit, and receive a first group of reception signals from the antenna unit; a first group of output ports coupled to the second power division network to output a first group of output port signals to the second power division network, and a second power division network coupled to the first group of circulators and the synthesizer to receive the first group of output port signals and generate a first reception signal and then output it to the synthesizer.

[0010] Another aspect of the present invention provides an isolation network, wherein the second elimination module includes: a third power division network, which is coupled to the phase shifter to receive the phase-shifted second decomposed signal and generate a second group of circulator input signals, and the second group of circulators includes: a second group of input ports coupled to the third power division network to receive the second group of circulator input signals; a second group of antenna ports coupled to the antenna unit to output a second group of transmit signals to the antenna unit and receive a second group of receive signals from the antenna unit; a second group of output ports coupled to the fourth power division network to output a second group of output port signals to the fourth power division network, and a fourth power division network coupled to the second group of circulators and the synthesizer to receive the second group of output port signals and generate a second receive signal and then output it to the synthesizer.

[0011] Another aspect of the invention provides an isolated network, wherein the first set of circulators includes two circulators, and wherein the second set of circulators includes two circulators.

[0012] Another aspect of the present invention provides an isolation network, wherein the first power division network is used to decompose the first decomposed signal into two signals with a phase difference of 90 degrees and equal power, and the third power division network is used to decompose the phase-shifted second decomposed signal into two signals with a phase difference of 90 degrees and equal power.

[0013] Another aspect of the present invention provides an isolation network, wherein the second power division network enables a 90 degree phase difference between the first group of output port signals for synthesis, and the fourth power division network enables a 90 degree phase difference between the second group of output port signals for synthesis.

[0014] Another aspect of the present invention provides an isolation network, wherein the phase rotation direction is adjusted by the first power division network and the second power division network to stimulate the antenna unit to generate a left-hand circular polarization signal or a right-hand circular polarization signal, and wherein the phase rotation direction is adjusted by the third power division network and the fourth power division network to stimulate the antenna unit to generate a left-hand circular polarization signal or a right-hand circular polarization signal.

[0015] Another aspect of the present invention provides an isolation network, wherein the feed points of the antenna unit are evenly distributed on the antenna unit.

[0016] Another aspect of the present invention provides an antenna supporting dual polarization directions, comprising: two of the above-mentioned isolation networks, and an antenna unit having eight evenly distributed feeding points, wherein a first isolation network of the two isolation networks is coupled to four non-adjacent feeding points in the antenna unit, and is used to excite the antenna unit to generate a first circularly polarized signal and a second circularly polarized signal and then generate a first linear polarized signal, and a second isolation network of the two isolation networks is coupled to another four non-adjacent feeding points in the antenna unit, and is used to excite the antenna unit to generate a third circularly polarized signal and a fourth circularly polarized signal and then generate a second linear polarized signal orthogonal to the first linear polarized signal.

[0017] Another aspect of the present invention provides an antenna supporting dual polarization directions, wherein the antenna unit generates a +45 degree linear polarization signal by adjusting the first isolation network, and the antenna unit generates a -45 degree linear polarization signal by adjusting the second isolation network, or wherein the antenna unit generates a -45 degree linear polarization signal by adjusting the first isolation network, and the antenna unit generates a +45 degree linear polarization signal by adjusting the second isolation network.

[0018] Another aspect of the present invention provides an antenna supporting dual polarization directions, wherein the antenna unit generates a 0-degree linear polarization signal by adjusting the first isolation network, and the antenna unit generates a 90-degree linear polarization signal by adjusting the second isolation network, or wherein the antenna unit generates a 90-degree linear polarization signal by adjusting the first isolation network, and the antenna unit generates a 0-degree linear polarization signal by adjusting the second isolation network.

[0019] Another aspect of the present invention provides an antenna array based on an isolation network, comprising: a power divider, which is used to decompose a transmitted signal into N equal-power signals; N processing circuit blocks, which are used to process the N equal-power signals, N antenna units, wherein each of the N antenna units is coupled to a processing circuit block, and a synthesizer, which is used to receive the processed N equal-power signals from the N processing circuit blocks and generate a received signal, wherein each of the N processing circuit blocks includes: the isolation network as described above, the isolation network receives one of the equal-power signals and is coupled to an antenna unit, wherein the isolation network is further configured to output the isolated signal to the synthesizer.

[0020] Another aspect of the present invention provides an antenna array based on an isolation network, wherein each of the N processing circuit blocks also includes a first phase shifter, coupled to a power divider, for phase shifting one of the N equal-power signals; a first power amplifier, coupled to the first phase shifter and the isolation network, for amplifying the phase-shifted signal and outputting it to the isolation network; a first low-noise amplifier, coupled to the isolation network and the second phase shifter, for receiving a signal from the isolation network and transmitting the power-adjusted signal to the second phase shifter; and a second phase shifter, coupled to a synthesizer, for receiving a signal from the first low-noise amplifier and transmitting the phase-adjusted signal to the synthesizer.

[0021] Another aspect of the present invention provides an antenna array based on an isolation network, wherein the antenna array also includes: a second power amplifier, coupled to the power divider, for receiving a transmit signal, and amplifying the transmit signal and outputting it to the power divider; a second low-noise amplifier, coupled to the synthesizer, for amplifying the received synthesized signal into a received signal, wherein each of the N processing circuit blocks also includes: a third phase shifter, coupled to the isolation network and the power divider, for phase shifting one of the N equal-power signals and outputting it to the isolation network; a fourth phase shifter, coupled to the isolation network and the synthesizer, for receiving a signal from the isolation network, and transmitting the phase-adjusted signal to the synthesizer.

[0022] Another aspect of the present invention provides an enhanced duplex system with a common transmitting and receiving antenna, comprising: a transmitting digital link for receiving a transmitting signal and performing digital domain processing on the signal; a transmitting radio frequency link for receiving a processed signal from the transmitting digital link and performing radio frequency domain processing on the received signal; an antenna array based on an isolation network as described above, which receives a signal processed by the transmitting radio frequency link and transmits the received signal processed in the antenna domain to a receiving radio frequency link; a receiving radio frequency link, which receives a signal from the antenna array based on the isolation network and performs radio frequency domain processing on the received signal; and a receiving digital link, which receives a signal from the receiving radio frequency link and performs digital domain processing on the received signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts:

[0024] Figure 1 It is a schematic diagram of the antenna domain self-interference elimination method based on the circulator;

[0025] Figure 2 is a schematic diagram of an antenna domain elimination method based on a circulator for generating a linear polarization signal according to an embodiment of the present invention;

[0026] Figure 3is a schematic diagram of an antenna unit feed point according to an embodiment of the present invention;

[0027] Figure 4 According to an embodiment of the present invention, an antenna domain elimination method based on a circulator is provided in which the isolation network generates a linearly polarized signal;

[0028] Figure 5 An antenna array design based on a circulator isolation network according to an embodiment of the present invention;

[0029] Figure 6 Another implementation of an antenna array based on a circulator isolation network according to an embodiment of the present invention;

[0030] Figure 7 is a block diagram of an enhanced duplex system with a common transmitting and receiving antenna according to an embodiment of the present invention;

[0031] Figure 8 is a schematic diagram of resource allocation mode of enhanced duplex system; and

[0032] Fig. 9 It is another schematic diagram of resource allocation in an enhanced duplex system. DETAILED DESCRIPTION

[0033] Before proceeding to the following detailed description, it may be advantageous to set forth the definitions of certain words and phrases used throughout this patent document. The term "coupling" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact with each other. The terms "transmission", "receiving" and "communication" and their derivatives cover direct and indirect communication. The terms "include" and "comprising" and their derivatives refer to including but not limited to. The term "or" is inclusive, meaning and / or. The phrase "associated with..." and its derivatives refer to including, including within, interconnecting, containing, contained within, connecting or connecting with, coupling or coupling with, communicating with, cooperating, interweaving, parallel, approaching, binding or binding with, having, having attributes, having a relationship or having a relationship with, etc. The term "controller" refers to any device, system or part thereof that controls at least one operation. Such a controller can be implemented with hardware, or a combination of hardware and software and / or firmware. The functions associated with any particular controller can be centralized or distributed, whether local or remote. The phrase "at least one of", when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one of the items in the list may be required. For example, "at least one of A, B, C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, A and B and C.

[0034] Definitions for other specific words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior and future uses of such defined words and phrases.

[0035] The division of modules and application combinations as well as the division levels of components in this article are only for illustration, and the division of modules and application combinations as well as the division levels of components may have different ways without departing from the scope of the present disclosure.

[0036] One possible improvement to duplex technology is to flexibly change the transmission direction (uplink or downlink) of each time slot according to factors such as business data or demand, which is also known as Dynamic TDD technology. By configuring the transmission direction of the time slot in a semi-static or dynamic manner, the flexibility of time-frequency resource configuration can be improved, thereby improving system performance.

[0037] Another possible improvement is to use full-duplex technology. Unlike the traditional half-duplex system that uses time domain (time division duplex, TDD) or frequency domain (frequency division duplex, FDD) orthogonal division for uplink and downlink, the full-duplex system allows the user's uplink and downlink to be transmitted simultaneously in the time domain and frequency domain. Therefore, the full-duplex system can theoretically achieve twice the throughput of the half-duplex system. However, since the uplink and downlink are at the same frequency at the same time, the transmitted signal of the full-duplex system will produce strong self-interference on the received signal, and the self-interference signal will even be more than 120 dB higher than the noise floor. Therefore, in order for the full-duplex system to work, the core issue is to design a solution to eliminate self-interference and reduce the strength of the self-interference signal to at least the same level as the noise floor.

[0038] Generally speaking, considering that the amplitude of the self-interference signal is much larger than the noise floor or even the received signal, self-interference elimination requires multi-stage elimination to minimize the impact of self-interference on the received signal. Traditional self-interference elimination includes antenna domain elimination, RF domain elimination, and digital domain elimination. Among them, antenna domain elimination is used to directly reduce the energy of the self-interference signal received by the receiving antenna through reasonable antenna isolation design; RF domain elimination continues to eliminate the residual self-interference signal to ensure that the energy transmitted to the filter, analog-digital converter (ADC), and mixer is low and will not saturate the device. Digital domain elimination receives the residual self-interference that has been eliminated by the antenna domain elimination and the RF domain elimination, so that the energy of the eliminated self-interference signal is as close to the noise floor as possible.

[0039] As the first step in eliminating self-interference, antenna domain elimination plays the role of passively isolating the transmit and receive links. Good antenna isolation design can significantly reduce the elimination requirements of the back-end (including RF domain elimination and digital domain elimination). Existing antenna domain elimination designs for full-duplex can be divided into the following types:

[0040] 1. Antenna domain elimination design for non-shared antennas for transmission and reception. In this method, the transmitting antenna and receiving antenna of the node supporting full-duplex are separated. In this case, good isolation can be provided by designing an isolation medium between the transmitting antenna and the receiving antenna.

[0041] 2. Antenna domain elimination design for transmitting and receiving antennas. In this type of method, a circulator or a duplexer is needed to provide isolation between the transmitting and receiving links.

[0042] Of the above two methods, the elimination design of the non-shared antenna for transmission and reception requires a larger antenna size and more antenna units, but it is easier to obtain a higher isolation; while the elimination design of the shared antenna for transmission and reception does not require additional antenna units, but it is difficult to obtain a higher isolation.

[0043] Currently, it is difficult for the transmit-receive common antenna structure based on a circulator or a duplexer to provide a high antenna isolation. Figure 1 Shown is a schematic diagram of the transmit-receive common antenna structure based on a circulator.

[0044] like Figure 1 As shown in the figure, the circulator has three ports, namely port 1, port 2, and port 3. For an ideal circulator, the signal can only flow from port 1 to port 2, or from port 2 to port 3, and port 1 and port 3 are isolated from each other. However, in practical applications, since the non-ideal circulator cannot achieve ideal isolation between port 1 and port 3, and other signal flows may also occur, the signal of the transmitting link will still cause obvious interference to the receiving link.

[0045] Due to the use of non-ideal circulators, the actual use of circulator-based antenna domain interference cancellation will suffer from the following interference:

[0046] Interference 1: Interference signal leaking from port 1 to port 3;

[0047] Interference 2: The transmission signal sent from port 1 to port 2 is partially transmitted from the antenna and partially reflected from the antenna back to port 2. This part of the signal is received from port 3 together with the received signal. This interference signal is also called standing wave interference.

[0048] Due to the existence of the above two interference signals, the circulator actually used can only provide about 20dB of isolation, which is far from meeting the isolation requirements of the full-duplex system.

[0049] As mentioned above, the antenna domain self-interference elimination based on the circulator cannot meet the isolation requirements of the existing full-duplex system. It is necessary to improve the circulator or introduce a new design to achieve the isolation between the transmission link and the reception link when the transmission and reception share the same antenna, so as to reduce the interference of the transmission link on the reception link.

[0050] The present invention improves the isolation effect of antenna domain self-interference elimination based on a circulator by designing a cancellation network.

[0051] In one embodiment of the present invention, a self-interference elimination device and method for a transmitting and receiving common antenna capable of generating a linearly polarized transmission signal are provided. Specifically, this embodiment utilizes the characteristic that a linearly polarized signal can be generated after two circularly polarized signals with opposite rotation directions are synthesized, and obtains a linearly polarized signal by connecting two elimination modules capable of generating circularly polarized signals with opposite rotation directions in parallel.

[0052] Figure 2 It is a schematic diagram showing an antenna domain elimination method based on a circulator for generating a linear polarization signal according to an embodiment of the present invention.

[0053] refer to Figure 2 Specifically, the transmitted signal passes through the power divider and is decomposed into two signals with the same power. One of the signals is directly input to the elimination module 1, which includes the power division network 1, the power division network 2, the circulator 1 and the circulator 2; the other signal is input to the elimination module 2 after a 90-degree phase shift, which includes the power division network 3, the power division network 4, the circulator 3 and the circulator 4. The power division network 1 and the power division network 3 have the same function, and are both used to decompose the input signal into two signals with a phase difference of 90 degrees and equal power. Specifically, by adjusting the power division network 1, one of the two output ports of the power division network 1 is deflected by 90 degrees, while the phase of the other output port remains unchanged. Similarly, by adjusting the power division network 3, one of the two output ports of the power division network 3 is deflected by 90 degrees, while the phase of the other output port remains unchanged.

[0054] The two output signals of the power division network 1 are respectively connected to the ports 11 and 21 (also called input ports) of the circulators 1 and 2 as the input signals of the circulators, and the ports 12 and 22 (also called antenna ports) of the circulators 1 and 2 are connected to the two feed points of the same antenna unit to output a set of transmission signals to the antenna unit and receive a set of reception signals from the antenna unit. The ports 13 and 23 (also called output ports) of the circulators 1 and 2 are connected to the two input ports of the power division network 2 as input signals.

[0055] The two output signals of the power division network 3 are respectively connected to the ports 31 and 41 (also called input ports) of the circulators 3 and 4 as the input signals of the circulators, and the ports 32 and 42 (also called antenna ports) of the circulators 3 and 4 are connected to the other two feed points of the same antenna unit to output a set of transmission signals to the antenna unit and receive a set of reception signals from the antenna unit. The ports 33 and 43 (also called output ports) of the circulators 3 and 4 are connected to the two input ports of the power division network 4 as input signals.

[0056] The functions of the power division network 2 and the power division network 4 are the same, and both are used to synthesize the input signals. Specifically, by adjusting the power division network 2, the phase of one of the input ports is rotated 90 degrees and then synthesized with the other input port. Similarly, by adjusting the power division network 4, the phase of one of the input ports is rotated 90 degrees and then synthesized with the other input port.

[0057] The output signals of the power division network 2 and the power division network 4 (ie, the synthesized signal) are synthesized as two input signals of the synthesizer to output a final received signal.

[0058] According to an embodiment of the present invention, two feed points generate one circular polarization signal. The two antenna ports of the circulator elimination module 2 are connected to the other two feed points of the same antenna unit to generate another circular polarization signal with the opposite rotation direction. The two circular polarization signals with the opposite rotation directions are synthesized into one linear polarization signal on the antenna unit. The output signals of the two circulator elimination modules are connected to the synthesizer, and finally the received signal is output.

[0059] By adjusting the phase rotation direction of the power division networks 1 and 2 and the phase rotation direction of the phase shifter, the signals excited by the ports 12 and 22 of the circulators 1 and 2 and the signals excited by the ports 32 and 42 of the circulators 3 and 4 are circularly polarized signals with opposite rotation directions. At this time, the two circularly polarized signals with opposite rotation directions excited on the same antenna unit can synthesize a linearly polarized signal.

[0060] According to an embodiment of the present invention, a simple example is as follows: the phase rotation direction of the power division networks 1 and 2 is adjusted so that the signals excited by the ports 12 and 22 of the circulators 1 and 2 are left-hand circularly polarized. At the same time, the power division networks 3 and 4 are adjusted in the same manner. In addition, the phase shifter is adjusted so that the phase is rotated by +90 degrees. At this time, the method can generate a signal with a polarization of +45 degrees. If the aforementioned phase shifter is adjusted so that the phase is rotated by -90 degrees. At this time, the method can generate a signal with a polarization of -45 degrees.

[0061] In another method of adjusting the polarization direction, the power division network can be adjusted to adjust the rotation direction of the circularly polarized signal excited by it. For example, the fixed phase shifter phase rotation is +90 degrees. The power division network is adjusted to generate a left-hand circularly polarized signal. At this time, the method can generate a +45-degree polarized signal. Conversely, the fixed phase shifter phase rotation is +90 degrees, and the power division network is adjusted to generate a right-hand circularly polarized signal. At this time, the method can generate a -45-degree polarized signal.

[0062] Alternatively, the fixed phase shifter phase rotation is -90 degrees, and the power division network is adjusted to generate a left-hand circularly polarized signal. In this case, the method can generate a -45 degree polarized signal. Conversely, the fixed phase shifter phase rotation is -90 degrees, and the power division network is adjusted to generate a right-hand circularly polarized signal. In this case, the method can generate a +45 degree polarized signal.

[0063] For a non-ideal circulator, there is leakage interference from port 1 to port 3, and interference caused by reflected echo from port 2 to port 3. After adopting the method provided in this embodiment, since there is a 90-degree phase difference between the output ports C and D of the power division network 1, the power division network 2 will introduce a 90-degree phase difference during synthesis. Under the condition that the line lengths experienced by the two synthesized signals are equal and the characteristics of the two power dividers are similar, there is a 180-degree phase difference between the two synthesized signals of the power division network 2. At this time, the leakage interference from port 1 to port 3 and the reflected echo interference from port 2 to port 3 introduced by the circulator can be offset, and the received signal is not affected.

[0064] Compared with a conventional circulator with a common transmit and receive antenna system, the solution provided in this embodiment can provide an isolation effect of about 50 dB, while a conventional circulator can only provide an isolation effect of about 20 dB.

[0065] In the method according to the embodiment of the present invention, a signal in a linear polarization direction is generated using one antenna unit. In a similar manner, one antenna unit can be used to generate signals in two linear polarization directions orthogonal to each other. For example, one antenna unit can be used to generate signals in two linear polarization directions of +45 degree polarization and -45 degree polarization.

[0066] Specifically, it is necessary to utilize eight different feeding points on an antenna unit. Figure 3 As shown, eight feed points on an antenna unit are evenly distributed on the antenna unit, and two non-adjacent groups of feed points are used to respectively connect two isolation networks of the circulator-based antenna domain that generate linear polarization signals, wherein one isolation network generates a linear polarization signal with a polarization direction of +45 degrees, and the other isolation network generates a linear polarization signal with a polarization direction of -45 degrees.

[0067] For example, Figure 3As shown, feed points 1, 3, 5, and 7 are used to connect the isolation network 1 of the antenna domain based on the circulator that generates linear polarization signals, and feed points 2, 4, 6, and 8 are used to connect the isolation network 2 of the antenna domain based on the circulator that generates linear polarization signals. Among them, by using the above method, by adjusting the phase shifter or the power division network, the isolation network 1 generates a +45 degree polarization signal, and the isolation network 2 generates a -45 degree polarization signal.

[0068] Alternatively, according to the method of the embodiment of the present invention, by adjusting the phase shifter or the power division network, the isolation network 1 generates a -45 degree polarized signal, and the isolation network 2 generates a +45 degree polarized signal.

[0069] The schematic diagram of the antenna isolation solution supporting dual polarization directions is as follows Figure 4 shown. Figure 4 A circulator-based antenna domain cancellation method is shown in which the isolation network is used to generate a linearly polarized signal.

[0070] It should be noted that, by adjusting the phase shifter and / or the power division network, the aforementioned circulator-based antenna domain isolation method for generating linear polarization signals can also generate signals with polarization directions of 0 degrees and / or 90 degrees.

[0071] According to another embodiment of the present invention, a method for designing an antenna array based on a circulator isolation network is introduced.

[0072] The solution provided in the aforementioned embodiment is applicable to the isolation of the common transmit and receive antenna of the antenna unit, or a single antenna scenario, that is, a single antenna unit is used as a transmit / receive antenna. Considering the increasing number of antennas used in current communication systems, it is far from enough to only consider the transmit and receive isolation of antenna units or single antenna scenarios. In this context, this embodiment proposes an antenna array design method based on a circulator isolation network. Specifically, the method provided in this embodiment is applicable to antenna arrays using phased arrays.

[0073] Figure 5 is a schematic diagram of an antenna array design method according to an embodiment of the present invention.

[0074] like Figure 5 As shown, the antenna array is composed of multiple antenna units, each antenna unit is connected to an isolation network, which can be a circulator-based isolation network that generates single or multiple linear polarization signals, wherein each antenna unit uses four or eight feed points.

[0075] Assuming that the number of antenna units in the antenna array is N, the signal to be transmitted is processed by digital and radio frequency, and then divided into N equal-power signals by a power divider. The output signal of each power divider passes through a phase shifter to adjust the phase, and then is amplified by a power amplifier (abbreviated as power amplifier) ​​and connected to the input end of the isolation network connected to one of the antenna units as the input signal of the isolation network.

[0076] After receiving the signal, the antenna unit in the antenna array sends the received signal to the isolation network connected to the antenna unit. The output end of the circulator-based isolation network outputs the isolated received signal and sends it to the low-noise amplifier and phase shifter to adjust the power and phase of the received signal of the antenna unit. The received signal processed by the noise floor amplifier and phase shifter connected to the N antenna units is combined by the synthesizer and sent to the receiving link RF unit and digital unit for further self-interference elimination processing and detection and demodulation of the received signal.

[0077] It should be noted that the method provided in this embodiment is applicable to various antenna implementation modes such as a single antenna unit, a linear array, and a planar array.

[0078] The aforementioned antenna array implementation method according to the embodiment of the present invention is applicable to the method in which each antenna unit is applicable to a power amplifier. In another phased array implementation method, a power amplifier can be used before the power divider to replace the power amplifier connected to each antenna, and a low noise amplifier can be used after the synthesizer to replace the low noise amplifier connected to each antenna unit. In this case, the antenna array design method based on the circulator isolation network is adopted. Figure 6 shown.

[0079] Figure 6 Another implementation of an antenna array based on a circulator isolation network according to an embodiment of the present invention is shown.

[0080] like Figure 6 As shown, after the transmit signal is amplified by the power amplifier, it is divided into N signals through the power divider. After each signal is phase-adjusted by the phase shifter, it is used as the input signal of the isolation network. After each antenna unit receives the signal, it is input into the isolation network. After the output is phase-adjusted by the phase shifter, it is synthesized by the synthesizer, and after passing through the low-noise amplifier, it is input into the RF front end as the received signal for subsequent interference elimination and estimation and detection of the received signal.

[0081] It should be noted that the method provided in this embodiment is applicable to various antenna implementation modes such as a single antenna unit, a linear array, and a planar array.

[0082] In yet another embodiment of the present invention, an enhanced duplex system with a common transmitting and receiving antenna is provided.

[0083] Figure 7 A system block diagram of an enhanced duplex system with a common transmitting and receiving antenna according to an embodiment of the present invention is shown.

[0084] like Figure 7 As shown, after the transmit signal is processed by the transmit digital link, it is sent to the radio frequency link for up-conversion, filtering, amplification and other operations. The signal processed by the transmit radio frequency link is used as an input signal and sent to the antenna array based on the circulator isolation network. The design method of the antenna array based on the circulator isolation network can refer to the method described in the embodiment of the present invention.

[0085] After the receiving antenna receives the signal, it is processed by the circulator-based isolation network and sent to the receiving RF link. After the receiving RF link amplifies, filters, down-converts the signal, it sends the processed signal to the receiving digital link for estimation and demodulation of the received signal.

[0086] Since the transmitted signal and the received signal share the same time-frequency resources for the enhanced duplex system with the same transmitting and receiving antenna, the transmitted signal will significantly interfere with the received signal, that is, the received signal will experience significant self-interference signals. To solve this self-interference problem, the method provided in this embodiment uses a multi-stage joint elimination method to deal with the self-interference problem.

[0087] Specifically, a self-interference elimination method combining antenna domain, radio frequency domain and digital domain is adopted. Among them, the antenna domain self-interference elimination method adopts the antenna domain self-interference elimination method based on the circulator provided in the above embodiment. The radio frequency domain uses a multi-tap reconstruction method to reconstruct the self-interference signal to complete the radio frequency domain self-interference elimination. The digital domain uses a self-interference channel estimation and reconstruction method to complete the digital domain self-interference elimination.

[0088] It should be noted that the resource allocation mode supported by the enhanced duplex system provided in this embodiment includes: the sending signal and the receiving signal occupy exactly the same time-frequency resources, or partially occupy the same time-frequency resources, such as Figure 8 shown.

[0089] Figure 8 is a schematic diagram showing a resource allocation mode of an enhanced duplex system.

[0090] Compared with the traditional duplex mode, the enhanced duplex system provided by this embodiment can improve the spectrum utilization, thereby increasing the system data reachable rate. Compared with the enhanced duplex system with separate transmit and receive antennas, the enhanced duplex system provided by this embodiment can reduce the antenna forming factor and reduce the implementation cost.

[0091] Fig. 9 FIG. 1 is a schematic diagram showing another mode of enhancing resource allocation in a duplex system. Fig. 9As shown in the figure, another possible support resource allocation method is: the time-frequency resources for sending data and receiving data do not overlap in the frequency domain, but the guard band reserved between the frequency bands occupied by sending data and receiving data is very small. In this case, the out-of-band leakage generated by the sending data will cause significant interference to the receiving data of the adjacent band. Considering that most of this type of interference is composed of nonlinear interference, it is difficult to eliminate it by adjusting the frequency point or synchronization. Therefore, it is still necessary to perform self-interference elimination according to the enhanced duplex processing method.

[0092] Specifically, the frequency bands for receiving data and sending data are treated as a whole to perform self-interference elimination. The aforementioned self-interference elimination method can be used.

[0093] According to an embodiment of the present invention, an isolation network based on a circulator is provided. Compared with a conventional system for isolating a transmitting and receiving antenna, the isolation network and method provided by the present invention can reduce antenna cost and antenna area. The solution provided by the present invention is applicable to a variety of enhanced duplex systems.

[0094] A person of ordinary skill in the art may understand that all or part of the steps of the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0095] The apparatus according to the present disclosure may include a processor, a memory for storing program data and executing program data, a permanent memory such as a disk drive, a communication port for communicating with an external device, and a user interface device such as a touch panel, a key, a button, etc. The method implemented by the software module or algorithm can be stored on a computer-readable recording medium as a computer-readable code or program command that can be executed on a processor. Examples of computer-readable recording media include magnetic storage media (such as read-only memory (ROM), random access memory (RAM), floppy disks and hard disks) and optical recording media (such as compact disc-ROM (CD-ROM) and digital versatile discs (digital versatile disc, DVD)). The computer-readable recording medium can also be distributed on a network-coupled computer system to store and execute computer-readable code in a distributed manner. The medium can be read by a computer, stored in a memory, and executed by a processor.

[0096] Figure reference numerals are used in the exemplary embodiments shown in the drawings to help understand the present disclosure, and specific terms are used to describe the embodiments of the present disclosure, but the present disclosure is not limited to the specific terms and the present disclosure may include any elements that can be generally conceived by a person of ordinary skill in the art.

[0097] The present disclosure can be represented by block components and various process operations. These functional blocks can be implemented by various numbers of hardware and / or software components that perform specific functions. For example, the present disclosure can adopt various integrated circuit components, such as memory elements, processing elements, logic elements, lookup tables, etc., which can perform various functions under the control of one or more microprocessors or other control devices. Similarly, in the case of using software programming or software elements to implement the elements of the present disclosure, the present disclosure can be implemented with any programming or scripting language, wherein various algorithms are implemented with any combination of data structures, objects, processes, routines or other programming elements. Functional aspects can be implemented as algorithms executed in one or more processors. In addition, the present disclosure can adopt any number of technologies for electronic configuration, signal processing and / or control, data processing, etc. according to the relevant technology. The terms "mechanism", "element", "device" or "component" are widely used and are not limited to the mechanical or physical embodiments of the present disclosure. The term can include routines of a series of software combined with a processor, etc.

[0098] The specific implementations shown and described herein are illustrative examples of the present disclosure and are not intended to limit the scope of the present disclosure in any way. For the sake of brevity, other functional aspects of electronic equipment, control systems, software development and systems according to the relevant technology may not be described in detail. In addition, the connecting lines or connectors shown in the various figures presented are intended to represent exemplary functional relationships and / or physical or logical couplings between various elements. In addition, unless the element is specifically described as "necessary" or "critical", no project or assembly is necessary for the practice of the present disclosure.

[0099] In the disclosure (especially in the claims), the use of "the" and other indicators similar thereto may correspond to singular and plural forms. In addition, when describing the scope in the present disclosure, the scope must be considered to include the invention to adopt any single element within the scope (unless otherwise described), and must be considered to have been written in the detailed description of the present disclosure Each individual element included in the scope. Unless the order of operations according to the method of the present disclosure is explicitly mentioned or described in other ways, the operations may be performed in an appropriate order. The order of operations is not limited to the order in which the operations are mentioned. The use of all examples or exemplary terms (e.g., "etc.", "and (or) etc." and "etc.") is intended only to describe the present disclosure in detail, and unless defined by the claims, the scope is not necessarily limited by the examples or exemplary terms. In addition, it will be appreciated by those of ordinary skill in the art that, without departing from the spirit and technical scope of the present disclosure and its equivalents, the present disclosure may be configured by various modifications, combinations and changes according to design conditions and factors.

[0100] Any description in the present invention should not be construed as implying that any particular element, step, or function is an essential element that must be included in the claims scope. The scope of the patented subject matter is limited solely by the claims.

Claims

1. An isolated network, comprising: A power splitter is used to decompose the transmission signal into two first decomposed signals and second decomposed signals with the same power. a phase shifter coupled to the power divider and shifting the phase of the second decomposed signal, a first cancellation module coupled to the power divider, the antenna unit and the synthesizer to receive a first decomposed signal from the power divider and output a first set of transmission signals to the antenna unit to stimulate the antenna unit to generate a first circularly polarized signal; and receiving a first group of received signals from the antenna unit, generating a first circularly polarized signal and outputting it to a synthesizer; a second cancellation module coupled to the phase shifter, the antenna unit and the synthesizer to receive the phase-shifted second decomposed signal from the phase shifter and output a second group of transmission signals to the antenna unit to excite the antenna unit to generate a second circularly polarized signal; and receiving a second group of received signals from the antenna unit, generating a second circularly polarized signal and outputting it to a synthesizer; a synthesizer coupled to the first cancellation module and the second cancellation module to synthesize the first circular polarization signal and the second circular polarization signal into a linear polarization signal, The first circularly polarized signal and the second circularly polarized signal rotate in opposite directions.

2. The isolated network according to claim 1, wherein: The first cancellation module is configured to be coupled to two feed points on the antenna unit; The second cancellation module is configured to be coupled to the other two feed points on the antenna unit.

3. The isolated network according to claim 1, wherein: The phase shifter shifts the phase of the second decomposed signal by 90 degrees.

4. The isolated network according to claim 1, wherein: The first group of transmission signals includes two transmission signals with a phase difference of 90 degrees; The second group of transmission signals includes two transmission signals with a phase difference of 90 degrees.

5. The isolated network according to claim 1, wherein: The first elimination module includes: a first power splitting network coupled to the power splitter to receive the first decomposed signal and generate a first set of circulator input signals, A first group of circulators, comprising: a first group of input ports coupled to a first power division network to receive a first group of circulator input signals; a first group of antenna ports coupled to an antenna unit to output a first group of transmission signals to the antenna unit and receive a first group of reception signals from the antenna unit; and a first group of input ports coupled to a first power division network to receive a first group of circulator input signals. a first group of output ports of the second power division network to output the first group of output port signals to the second power division network, The second power division network is coupled to the first group of circulators and the synthesizer to receive the first group of output port signals and generate a first receiving signal and then output it to the synthesizer.

6. The isolated network according to claim 1, wherein: The second elimination module includes: a third power splitter network coupled to the phase shifter to receive the phase-shifted second decomposed signal and generate a second set of circulator input signals, A second group of circulators, comprising: a second group of input ports coupled to the third power division network to receive a second group of circulator input signals; a second group of antenna ports coupled to the antenna unit to output a second group of transmit signals to the antenna unit and receive a second group of receive signals from the antenna unit; a second group of output ports coupled to the fourth power division network to output a second group of output port signals to the fourth power division network, A fourth power division network is coupled to the second group of circulators and the synthesizer to receive a second group of output port signals and generate a second receiving signal and then output it to the synthesizer.

7. The isolated network according to claim 5 or 6, wherein: The first set of circulators includes two circulators, and wherein the second set of circulators includes two circulators.

8. The isolated network according to claim 7, wherein: The first power splitting network is used to split the first decomposed signal into two signals with a phase difference of 90 degrees and equal power, and The third power division network is used to decompose the phase-shifted second decomposed signal into two signals with equal power and a phase difference of 90 degrees.

9. The isolated network according to claim 7, wherein: The second power division network allows a 90-degree phase difference between the first group of output port signals for synthesis, and The fourth power division network enables a 90-degree phase difference between the second group of output port signals for synthesis.

10. The isolated network according to claim 7, wherein: The phase rotation direction is adjusted by the first power division network and the second power division network to stimulate the antenna unit to generate a left-hand circular polarization signal or a right-hand circular polarization signal, and The phase rotation direction is adjusted by the third power division network and the fourth power division network to stimulate the antenna unit to generate a left-hand circular polarization signal or a right-hand circular polarization signal.

11. The isolated network according to claim 1, wherein: The feeding points of the antenna unit are evenly distributed on the antenna unit.

12. An antenna supporting dual polarization directions, comprising: Two isolated networks as claimed in claim 1, The antenna unit has eight evenly distributed feed points. The first isolation network of the two isolation networks is coupled to four non-adjacent feeding points in the antenna unit, and is used to excite the antenna unit to generate a first circularly polarized signal and a second circularly polarized signal, and then generate a first linearly polarized signal. The second isolation network of the two isolation networks is coupled to four other non-adjacent feeding points in the antenna unit, and is used to excite the antenna unit to generate a third circular polarization signal and a fourth circular polarization signal, and then generate a second linear polarization signal orthogonal to the first linear polarization signal.

13. The antenna according to claim 12, wherein: The first isolation network is adjusted so that the antenna unit generates a +45 degree linear polarization signal, and the second isolation network is adjusted so that the antenna unit generates a -45 degree linear polarization signal, or The first isolation network is adjusted so that the antenna unit generates a -45 degree linear polarization signal, and the second isolation network is adjusted so that the antenna unit generates a +45 degree linear polarization signal.

14. The antenna according to claim 12, wherein: The first isolation network is adjusted so that the antenna unit generates a 0-degree linear polarization signal, and the second isolation network is adjusted so that the antenna unit generates a 90-degree linear polarization signal, or The first isolation network is adjusted so that the antenna unit generates a 90-degree linear polarization signal, and the second isolation network is adjusted so that the antenna unit generates a 0-degree linear polarization signal.

15. An antenna array based on an isolation network, comprising: A power divider, which is used to decompose the transmission signal into N equal-power signals; N processing circuit blocks are used to process N equal-power signals. N antenna elements, wherein each of the N antenna elements is coupled to a processing circuit block, and a synthesizer for receiving the processed N equal-power signals from the N processing circuit blocks and generating a received signal, Wherein, each of the N processing circuit blocks includes: The isolation network of claim 1, wherein the isolation network receives one of the equal power signals and is coupled to an antenna unit, wherein the isolation network is further configured to output the isolated signal to the synthesizer.

16. The antenna array according to claim 15, wherein: Each of the N processing circuit blocks further includes a first phase shifter, coupled to the power divider, for shifting the phase of one of the N equal-power signals; A first power amplifier, coupled to the first phase shifter and the isolation network, for amplifying the phase-shifted signal and outputting it to the isolation network; a first low noise amplifier coupled to the isolation network and the second phase shifter for receiving a signal from the isolation network and transmitting a power-adjusted signal to the second phase shifter; as well as The second phase shifter is coupled to the synthesizer and is configured to receive the signal from the first low noise amplifier and transmit the phase-adjusted signal to the synthesizer.

17. The antenna array according to claim 15, wherein: The antenna array further comprises: A second power amplifier, coupled to the power divider, for receiving a transmission signal and amplifying the transmission signal and then outputting it to the power divider; a second low noise amplifier, coupled to the synthesizer, for amplifying the received synthesized signal into a received signal, Wherein, each of the N processing circuit blocks further includes: A third phase shifter, coupled to the isolation network and the power divider, is used to phase shift one of the N equal-power signals and output the phase shifted signal to the isolation network; The fourth phase shifter is coupled to the isolation network and the synthesizer, and is used to receive the signal from the isolation network and transmit the phase-adjusted signal to the synthesizer.

18. An enhanced duplex system with a common transmitting and receiving antenna, comprising: A transmitting digital link is used to receive the transmitted signal and perform digital domain processing on the signal; A transmit radio frequency link, configured to receive the processed signal from the transmit digital link and perform radio frequency domain processing on the received signal; An antenna array based on an isolation network as claimed in any one of claims 15 to 17, which receives a signal processed by a transmit radio frequency link and transmits a received signal processed by an antenna domain to a receive radio frequency link; A receive RF link that receives a signal from an antenna array based on an isolation network and performs RF domain processing on the received signal; as well as The receiving digital link receives the signal from the receiving radio frequency link and performs digital domain processing on the received signal.

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