Standing wave detection method, standing wave detection device and network equipment

Abstract

The present disclosure provides a standing wave detection method for a network device, including: detecting the power level of a reflected signal REV and a power level of a forward signal FWD of the network device; obtaining the standing wave ratio corresponding to multiple transmission channels of the network device according to the detected power level of the reflected signal REV and the power level of the forward signal FWD; wherein the step of detecting the power level of REV includes: sending a standing wave detection signal through multiple transmission channels of the network device; obtaining the power level of REV through multiple receiving channels of the network device; the step of detecting the power level of FWD includes: controlling the sending of a standing wave detection signal through multiple transmission channels of the network device; controlling a receiving channel to obtain the power level of FWD through an antenna calibration network. The present disclosure simplifies the device structure of the network device by multiplexing the receiving channel and the antenna calibration network, and reduces the wiring area and cost of the network device. The present disclosure also provides a standing wave detection device and a network device.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a standing wave detection method for a network device, a standing wave detection device for a network device, and a network device. Background Art

[0002] A base station is a radio transceiver station that transmits information to mobile phone terminals through a mobile communication exchange center in a certain radio coverage area. With the rapid development of communication technology and the advent of the 5G communication era, the number of transceiver channels of base stations has increased dozens of times compared to the past, and the control circuits and detection circuits corresponding to each channel have also increased, making the internal equipment structure of the base station complicated and the space utilization rate low.

[0003] Therefore, how to simplify the circuit structure of the base station and improve the space utilization of the base station has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The present disclosure provides a standing wave detection method, a standing wave detection device and a network device. The standing wave detection method realizes standing wave detection by reusing the existing circuit structure in the network device, which can simplify the device structure of the network device and reduce the wiring area and cost of the network device.

[0005] To achieve the above object, as one aspect of the present disclosure, a standing wave detection method for a network device is provided, comprising:

[0006] detecting a power level of a reflected signal REV;

[0007] detecting a power level of a forward signal FWD;

[0008] The standing wave ratios corresponding to the multiple transmission channels of the network device are obtained according to the detected power level of the REV and the power level of the FWD; wherein,

[0009] The step of detecting the power level of REV includes: sending a standing wave detection signal through multiple transmission channels of the network device; and obtaining the power level of REV through multiple reception channels of the network device;

[0010] The step of detecting the power level of the FWD includes: controlling a plurality of transmission channels of the network device to send standing wave detection signals; and controlling one of the receiving channels to obtain the power level of the FWD through an antenna calibration network.

[0011] Optionally, the step of detecting REV further includes, before sending the standing wave detection signal:

[0012] Controlling the plurality of receiving channels to be connected to the antenna calibration network;

[0013] The steps of detecting FWD also include the following steps before issuing the standing wave detection signal:

[0014] A receiving channel is controlled to be connected to the radio frequency interface of the network device through the circulator.

[0015] Optionally, the step of obtaining standing wave ratios corresponding to a plurality of transmission channels of the network device includes:

[0016] The linear value of the forward detection power is obtained by the power of FWD, and the linear value of the reverse detection power is obtained by the power of REV;

[0017] Obtaining a reflection coefficient according to the forward detection power linear value and the reverse detection power linear value;

[0018] Obtaining a standing wave ratio of the network device according to the reflection coefficient;

[0019] The power of FWD is obtained by the receiving channel gain of the antenna calibration network and the detected power level of FWD, and the power of REV is obtained by the gain of each receiving channel and the detected power level of REV.

[0020] Alternatively, the FWD power is calculated by the formula P f =P acrx (i)-G acrx Get, where P acrx (i) is the detected power level of FWD, G acrx calibrating a receive channel gain of a network for the antenna;

[0021] The power of REV is calculated by the formula P r =P rx '(i)-G rx (i) we get, where P rx '(i) is the detected power level of REV, G rx (i) is the gain of the receiving channel.

[0022] Optionally, the standing wave detection method further includes a step of acquiring a standing wave signal level, including:

[0023] Controlling a transmission channel of the network device to send a standing wave calibration signal;

[0024] Controlling a plurality of receiving channels of the network device to obtain standing wave signal levels through the antenna calibration network;

[0025] The receiving channel gain G of REV rx (i) By calculation formula G rx (i) = P rx (i)-(Pactx +G actx ) is obtained, where P rx (i) is the power of the standing wave signal level, P actx is the power of the standing wave detection signal emitted by the transmitting channel, G actx A transmit channel gain of a network is calibrated for the antenna.

[0026] As a second aspect of the present disclosure, a standing wave detection device for a network device is provided, comprising:

[0027] A storage medium, wherein the storage medium stores an executable program;

[0028] One or more processors, wherein the one or more processors are capable of calling the executable program to implement the standing wave detection method described above.

[0029] As a third aspect of the present disclosure, a network device is provided, including an antenna calibration network, a standing wave detection device, multiple transmitting channels and multiple receiving channels, wherein the antenna calibration network is connected to the multiple receiving channels, and the standing wave detection device is the standing wave detection device described above.

[0030] Optionally, the network device also includes a first selection switch, which is connected to one of the receiving channels, and the receiving channel is selectively connected to the antenna calibration network or the radio frequency interface of the network device through the first selection switch. The network device also includes multiple circulators, and each of the transmitting channel and each of the receiving channel is connected to the radio frequency interface of the network device through a corresponding circulator.

[0031] Optionally, the network device further includes a plurality of transmitting devices and a plurality of receiving devices, each of the transmitting channels is connected to the circulator via the transmitting device, and each of the receiving channels is connected to the circulator via the receiving device.

[0032] Optionally, the transmitting device is a power amplifier, and the receiving device is a low noise amplifier.

[0033] In the standing wave detection method, the standing wave detection device and the network equipment provided by the present invention, the receiving channel RX and the antenna calibration network are multiplexed to replace the solution of using the detection channel ORX in the prior art to realize standing wave detection, thereby eliminating the detection channel ORX and the corresponding circuit structures such as the signal acquisition device and the switch device in the network equipment, thereby simplifying the equipment structure of the network equipment, improving the utilization rate of the network equipment space, and reducing the wiring area and cost of the network equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0035] Figure 1 It is a schematic diagram of the connection relationship between a receiving channel, a transmitting channel and a detection channel in the related technology;

[0036] Figure 2 It is a schematic diagram of the connection relationship between multiple receiving and transmitting channels and detection channels in the related art;

[0037] Figure 3 It is a schematic diagram of the principle of implementing standing wave detection in a receiving and transmitting channel in the present disclosure;

[0038] Figure 4 It is a schematic diagram of the principle of implementing standing wave detection by multiple receiving and transmitting channels in the present disclosure.

[0039] Description of Reference Numerals

[0040] 11: First selection switch 12: Second selection switch

[0041] 13: Third selection switch 21: Transmitter

[0042] 22: Receiving device 23: Forward FWD acquisition device

[0043] 30: Circulator DETAILED DESCRIPTION

[0044] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0045] In order to detect the performance of the base station in real time, it is often necessary to perform standing wave detection on the base station, that is, to send a continuous sine wave (i.e., standing wave detection signal) or a single tone signal through the base station's transmission channel, receive the reflected wave, and process and analyze the forward signal FWD and the reflected signal REV to obtain information such as the standing wave ratio, and then obtain the connection status of the antenna cable and the fault status of the base station.

[0046] In the existing base station standing wave detection solution, the standing wave detection signal is sent by the transmission channel TX, while the forward signal FWD and the reflected signal REV are obtained through a separate detection channel ORX. Figure 1 As shown, the detection channel ORX obtains the forward signal FWD through the forward FWD acquisition device, the reflected signal REV received by the receiving channel RX1 is transferred to the detection channel ORX through the switch, and the detection channel ORX receives the reflected signal REV and the forward signal FWD in turn through the switch switching.

[0047] In the prior art, the number of channels used for detection by the detection channel ORX is usually small. However, with the advent of the 5G communication era, the number of transceiver channels of the base station has greatly increased compared with before. Figure 2 As shown, if the existing standing wave detection solution is still adopted, the reflection signal REV detection circuit and switch corresponding to the detection channel ORX will occupy a huge space, and the detection time is long, and the detection efficiency is low.

[0048] To solve the above technical problems, as one aspect of the present disclosure, a standing wave detection method for a network device (such as a base station) is provided, comprising:

[0049] In step S1, the power level of the reflected signal REV is detected;

[0050] In step S2, the power level of the forward signal FWD is detected;

[0051] In step S3, the standing wave ratios corresponding to the multiple transmission channels TX of the network device are obtained according to the detected power level of the REV and the power level of the FWD.

[0052] The step S1 of detecting the power level of REV includes:

[0053] In step S11, a standing wave detection signal is sent through a plurality of transmission channels TX of the network device; and,

[0054] In step S12, the power level of REV is obtained through a plurality of receiving channels RX of the network device;

[0055] The step S2 of detecting the power level of the FWD comprises:

[0056] In step S21, multiple transmission channels TX of the network device are controlled to send standing wave detection signals; and,

[0057] In step S22, one of the receiving channels RX is controlled to obtain the power level of the FWD through the antenna calibration network (AC network) of the network device.

[0058] like Figure 3 The figure shows the circuit connection method corresponding to a radio frequency interface of a network device when the network device is detected using the standing wave detection method provided by the present invention. The network device includes multiple transmitting channels TX and multiple receiving channels RX. For each radio frequency interface, there is a transmitting channel TX and a receiving channel RX corresponding to it.

[0059] In the present disclosure, in addition to completing the normal signal reception work, the receiving channel RX is also reused to obtain the power level of REV in the standing wave detection, and the antenna calibration network is also reused to obtain the power level of FWD corresponding to each radio frequency interface in addition to the normal calibration function. That is, in the present disclosure, by multiplexing the receiving channel RX and the antenna calibration network, the solution of using the detection channel ORX in the prior art to implement standing wave detection is replaced, and the detection channel ORX in the network device (such as a base station) and the detection channel ORX are used to obtain the signal from the transmitting channel TX and the receiving channel RX. The corresponding circuit structure, such as the signal acquisition device, the switch device, etc., are omitted, thereby simplifying the device structure of the network device, improving the utilization rate of the network device space, and reducing the wiring area and cost of the network device.

[0060] And, if Figure 4 As shown in the figure, since the number of receiving channels RX corresponds to the number of transmitting channels TX, multiple receiving channels RX can simultaneously receive the power level of REV corresponding to multiple RF interfaces without having to pass Figure 2 The switch structure shown switches channels one by one, thereby improving the standing wave detection efficiency of network equipment and enabling efficient detection of network equipment (e.g., 5G base stations).

[0061] The embodiment of the present disclosure does not specifically limit the number of receiving channels RX and transmitting channels TX. Figure 4 As shown, the network device may include 64 receiving channels RX (RX1 to RX64) and 64 transmitting channels TX (TX1 to TX64), corresponding to 64 RF interfaces (RF interface 1 to RF interface 64).

[0062] It should be noted that the antenna calibration network is an n-way-in-one calibration network for compensating the phase and amplitude differences between radio paths. The embodiment of the present disclosure does not specifically limit how the antenna calibration network obtains the power level of the FWD. For example, Figure 3 As shown, the antenna calibration network is connected to the channel corresponding to each RF interface through multiple forward FWD acquisition devices 23. Figure 4 As shown, the forward FWD acquisition device 23 may be a coupler.

[0063] The embodiment of the present disclosure does not specifically limit how the transmitting channel TX and the receiving channel RX are connected to the radio frequency interface of the network device. For example, Figure 3 , Figure 4As shown, the network device further includes a plurality of circulators 30, and the transmitting channel TX and the receiving channel RX are both connected to the RF interface of the network device through the circulators 30. The standing wave detection signal emitted by the transmitting channel TX can be unidirectionally transmitted to the RF interface of the network device through the circulator 30, and the power level of REV returned by the RF interface of the network device can be unidirectionally transmitted to the transmitting channel TX through the circulator 30.

[0064] like Figure 3 , Figure 4 As shown, one of the receiving channels RX is selectively connected to the antenna calibration network or the radio frequency interface of the network device through the first selection switch 11. Accordingly, the step S2 of detecting the power level of REV also includes the following steps before sending the standing wave detection signal:

[0065] Control the plurality of receiving channels RX to be connected to the antenna calibration network (ie, control the first selection switch 11 to connect the corresponding receiving channels RX to the antenna calibration network, so that all receiving channels RX are connected to the antenna calibration network).

[0066] The step S1 of detecting the power level of the FWD also includes the following steps before sending the standing wave detection signal:

[0067] A receiving channel RX (ie, the receiving channel RX connected to the first selection switch 11 ) is controlled to be connected to the radio frequency interface of the network device through the circulator 30 .

[0068] The embodiment of the present disclosure does not specifically limit how to obtain the standing wave ratios corresponding to the multiple transmission channels TX (or multiple radio frequency interfaces). For example, step S3 of obtaining the standing wave ratios corresponding to the multiple transmission channels TX of the network device includes:

[0069] In step S31, a forward detection power linear value is obtained by the power of FWD, and a reverse detection power linear value is obtained by the power of REV;

[0070] In step S32, a reflection coefficient is obtained according to the forward detection power linear value and the reverse detection power linear value;

[0071] In step S33, the standing wave ratio of the network device is obtained according to the reflection coefficient.

[0072] Wherein, in step S31, the power of the FWD is obtained by the receiving channel RX gain of the antenna calibration network and the detected power level of the FWD, and the power of the REV is obtained by the gain of each receiving channel RX and the detected power level of the REV, specifically:

[0073] The power of FWD can be calculated by the formula P f =P acrx (i)-G acrx Get, where P acrx (i) is the detected power level of FWD, G acrx is the gain of the receiving channel RX;

[0074] The power of REV is calculated by the formula P r =P rx (i)-G rx (i)P r =P rx '(i)-G rx (i) we get, where P rx '(i) is the power level of the detected REV, G rx (i) is the receiving channel RX gain of the REV.

[0075] The standing wave detection method further includes a step S0 of obtaining a standing wave signal level to calibrate the standing wave detection signal, including:

[0076] In step S01, a transmission channel TX of the network device is controlled to send a standing wave detection signal (power is recorded as P actx );

[0077] In step S02, the multiple receiving channels RX of the network device are controlled to obtain the standing wave signal level (power is recorded as an array P) through the antenna calibration network. rx (i)).

[0078] P(i) and P actx Both are used to calibrate the standing wave detection signal, the receiving channel RX gain G of REV rx (i) By calculation formula G rx (i) = P rx (i)-(P actx +G actx ) is obtained, where P rx (i) is the power of the standing wave signal level detected by the antenna calibration network received by multiple receiving channels, P actx is the power of the standing wave detection signal emitted by the transmitting channel, G actx A transmit channel gain of a network is calibrated for the antenna.

[0079] The transmit channel TX gain G of the antenna calibration network actx and the receiving channel RX gain G of the antenna calibration network acrx All are measured during production testing.

[0080] In step S31, the forward detection power linear value and the reverse detection power linear value are calculated as follows:

[0081] Forward detection power linear value: (Unit: W);

[0082] Reverse detection power linear value: (Unit: W).

[0083] In step S32, the calculation formula for calculating the reflection coefficient is as follows:

[0084] Reflection coefficient:

[0085] In step S33, the calculation formula for calculating the standing wave ratio of the network device is as follows:

[0086] VSWR:

[0087] Substituting the previous formula into the standing wave ratio formula, we can get:

[0088] VSWR: in,

[0089] P r -P f =P rx (i)-G rx (i)-[P acrx (i)-G acrx ] It should be noted that in all the above calculation formulas, i represents the channel number. For example, when the network device includes 64 RF interfaces and corresponding 64 receiving channels RX and 64 transmitting channels TX, i ranges from 1 to 64, and finally the VSWR values ​​corresponding to the 64 channels can be calculated.

[0090] As a second aspect of the present disclosure, a standing wave detection device for a network device is also provided, comprising:

[0091] A storage medium, wherein the storage medium stores an executable program;

[0092] One or more processors, wherein the one or more processors are capable of calling the executable program to implement the standing wave detection method described in the previous embodiment, thereby replacing the solution of using the detection channel ORX to implement standing wave detection in the prior art by multiplexing the receiving channel RX and the antenna calibration network, thereby simplifying the device structure of the network device, reducing the wiring area and cost of the network device, and improving the standing wave detection efficiency of the network device.

[0093] As a third aspect of the present disclosure, a network device is also provided, including an antenna calibration network, a standing wave detection device, multiple transmitting channels TX and multiple receiving channels RX, the antenna calibration network is connected to the multiple receiving channels, and the standing wave detection device is the standing wave detection device described in the previous embodiment.

[0094] In the network device provided by the present disclosure, the receiving channel RX is multiplexed for obtaining the power level of REV in the standing wave detection in addition to completing the normal signal receiving work, and the antenna calibration network is multiplexed for obtaining the power level of FWD corresponding to each radio frequency interface in addition to the normal calibration function. That is, the present disclosure replaces the solution of using the detection channel ORX in the prior art to implement standing wave detection by multiplexing the receiving channel RX and the antenna calibration network, and eliminates the detection channel ORX in the network device and the corresponding circuit structures such as the signal acquisition device and the switch device used by the detection channel ORX to obtain the signal from the transmitting channel TX and the receiving channel RX, thereby simplifying the device structure of the network device, improving the utilization rate of the network device space, and reducing the wiring area and cost of the network device.

[0095] Furthermore, since the number of receiving channels RX corresponds to the number of transmitting channels TX, multiple receiving channels RX can simultaneously receive the power levels of REV corresponding to multiple RF interfaces, thereby improving the standing wave detection efficiency of network equipment and enabling efficient detection of network equipment.

[0096] The disclosed embodiment does not specifically limit the type of the network device. For example, the network device may be a base station (e.g., a 5G base station). The disclosed embodiment does not specifically limit how the antenna calibration network obtains the power level of the FWD. For example, Figure 3 As shown, the antenna calibration network is connected to the channel corresponding to each RF interface through multiple forward FWD acquisition devices 23. Figure 4 As shown, the forward FWD acquisition device 23 may be a coupler.

[0097] The embodiment of the present disclosure does not specifically limit how the transmitting channel TX and the receiving channel RX are connected to the radio frequency interface of the network device. For example, Figure 3 , Figure 4As shown, the network device further includes a first selection switch, the first selection switch 11 is connected to one of the receiving channels RX, and the receiving channel RX is selectively connected to the antenna calibration network or the RF interface of the network device through the first selection switch 11. The network device further includes a plurality of circulators 30, each of the transmitting channels TX and each of the receiving channels RX is connected to the RF interface of the network device through a corresponding circulator 30. The standing wave detection signal emitted by the transmitting channel TX can be unidirectionally transmitted to the RF interface of the network device through the circulator 30, and the REV returned by the RF interface of the network device can be unidirectionally transmitted to the transmitting channel TX through the circulator 30.

[0098] To further improve the quality of standing wave detection signal and REV signal, Figure 3 As shown, preferably, the network device further includes a plurality of transmitting devices 21 and a plurality of receiving devices 22, each of the transmitting channels TX is connected to the circulator 30 through the transmitting device 21, and each of the receiving channels RX is connected to the circulator 30 through the receiving device 22, so that the signal quality of the transmitting channel TX and the receiving channel RX is stabilized by the transmitting device 21 and the receiving device 22. The disclosed embodiment does not specifically limit the types of the transmitting device 21 and the receiving device 22, for example, Figure 4 As shown, the transmitting device 21 may be a power amplifier (PA), and the receiving device 22 may be a low noise amplifier (LNA) or a switching low noise amplifier (DSLNA).

[0099] The embodiments of the present disclosure do not specifically limit other circuit structures of the network device. For example, Figure 3 , Figure 4 As shown, in order to realize a multiplexed antenna calibration network (AC network), the network device also includes a second selection switch 12 and a third selection switch 13. The transmission channel TX is selectively connected to the circulator 30 or the third selection switch 13 through the second selection switch 12, and the antenna calibration network is selectively connected to the third selection switch 13 or the receiving channel RX, so that the antenna calibration network can complete the antenna calibration task and the network device standing wave detection task respectively at different time periods by switching the switch.

[0100] The network device provided by the present invention replaces the solution of using the detection channel ORX in the prior art to realize standing wave detection by multiplexing the receiving channel RX and the antenna calibration network, thereby eliminating the detection channel ORX and the corresponding circuit structures such as the signal acquisition device and the switch device in the network device, thereby simplifying the device structure of the network device, improving the utilization rate of the network device space, and reducing the wiring area and cost of the network device.

[0101] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A standing wave detection method for a network device, comprising: detecting a power level of a reflected signal REV; detecting a power level of a forward signal FWD; The standing wave ratios corresponding to the multiple transmission channels of the network device are obtained according to the detected power level of the REV and the power level of the FWD; wherein, The step of detecting the power level of REV includes: sending a standing wave detection signal through multiple transmission channels of the network device; and obtaining the power level of REV through multiple reception channels of the network device; The step of detecting the power level of the FWD includes: controlling a plurality of transmission channels of the network device to send a standing wave detection signal; and controlling one of the receiving channels to obtain the power level of the FWD through an antenna calibration network; Obtaining the standing wave ratios corresponding to the plurality of transmission channels of the network device according to the detected power level of the REV and the power level of the FWD includes: The linear value of the forward detection power is obtained by the power of FWD, and the linear value of the reverse detection power is obtained by the power of REV; Obtaining a reflection coefficient according to the forward detection power linear value and the reverse detection power linear value; Obtaining a standing wave ratio of the network device according to the reflection coefficient; The power of FWD is obtained by the receiving channel gain of the antenna calibration network and the detected power level of FWD, and the power of REV is obtained by the gain of each receiving channel and the detected power level of REV.

2. The standing wave detection method according to claim 1, wherein: The step of detecting the power level of REV also includes the following steps before issuing the standing wave detection signal: Controlling the plurality of receiving channels to be connected to the antenna calibration network; The step of detecting the power level of the FWD also includes the following steps before issuing the standing wave detection signal: A receiving channel is controlled to be connected to the radio frequency interface of the network device through the circulator.

3. The standing wave detection method according to claim 1, wherein: The FWD power is calculated by the formula P f =P acrx (i)-G acrx Get, where P acrx (i) is the detected power level of FWD, G acrx calibrating a receive channel gain of a network for the antenna; The power of REV is calculated by the formula P r =P rx '(i)-G rx (i) we get, where P rx '(i) is the detected power level of REV, G rx (i) is the gain of the receiving channel.

4. The standing wave detection method according to claim 3, wherein: The standing wave detection method further includes a step of obtaining a standing wave signal level, including: Controlling a transmission channel of the network device to send a standing wave calibration signal; Controlling a plurality of receiving channels of the network device to obtain standing wave signal levels through the antenna calibration network; The receiving channel gain G of REV rx (i) By calculation formula G rx (i) = P rx (i)-(P actx +G actx ) is obtained, where P rx (i) is the power of the standing wave signal level, P actx is the power of the standing wave detection signal emitted by the transmitting channel, G actx A transmit channel gain of a network is calibrated for the antenna.

5. A standing wave detection device for a network device, comprising: A storage medium, wherein the storage medium stores an executable program; One or more processors, wherein the one or more processors are capable of calling the executable program to implement the standing wave detection method described in any one of claims 1 to 4.

6. A network device comprising an antenna calibration network, a standing wave detection device, a plurality of transmitting channels and a plurality of receiving channels, wherein: The antenna calibration network is connected to the plurality of receiving channels, and the standing wave detection device is the standing wave detection device according to claim 5.

7. The network device according to claim 6, wherein: The network device also includes a first selection switch, which is connected to one of the receiving channels. The receiving channel is selectively connected to the antenna calibration network or the radio frequency interface of the network device through the first selection switch. The network device also includes multiple circulators, and each of the transmitting channel and each of the receiving channels are connected to the radio frequency interface of the network device through a corresponding circulator.

8. The network device according to claim 7, wherein: The network device further comprises a plurality of transmitting devices and a plurality of receiving devices, each of the transmitting channels is connected to the circulator via the transmitting device, and each of the receiving channels is connected to the circulator via the receiving device.

9. The network device according to claim 8, wherein: The transmitting device is a power amplifier, and the receiving device is a low noise amplifier.

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