WO2022257775A1

WO2022257775A1 - Standing wave detection method and apparatus

Info

Publication number: WO2022257775A1
Application number: PCT/CN2022/095327
Authority: WO
Inventors: 闫耀峰; 王巨震; 王军; 张哲源; 宋林东
Original assignee: 中兴通讯股份有限公司
Priority date: 2021-06-08
Filing date: 2022-05-26
Publication date: 2022-12-15
Also published as: CN115459866A

Abstract

Embodiments of the present invention provide a standing wave detection method and apparatus. The method comprises: in a transmitting time slot, combining a reflected signal of an antenna port into a receiving link by means of a combining network to obtain reverse power of the reflected signal; and performing standing wave detection on the reflected signal according to the reverse power. The method can solve the problem in the related art that a link is complex and the cost is high caused due to the fact that a time division duplex wireless communication system needs additional hardware circuits such as a frequency mixer, an operational amplifier, and an analog-to-digital converter, and needs a dedicated link for transmission and detection of the reflected signal. The receiving link is multiplexed, the reverse power is transmitted in a downlink time slot by using the receiving link, a standing wave detection link is simplified, a wiring area is saved, devices such as the frequency mixer and the operational amplifier are not needed, and the cost is greatly reduced on the premise of ensuring the function.

Description

A standing wave detection method and device

Cross References to Related Applications

This disclosure is based on the Chinese patent application CN202110639086.2 with the title of "a standing wave detection method and device" filed on June 08, 2021, and claims the priority of this patent application, and the disclosed content is fully incorporated by reference incorporated into this disclosure.

technical field

Embodiments of the present disclosure relate to the communication field, and in particular, to a standing wave detection method and device.

Background technique

In the RF transmission link of wireless communication equipment, in order to protect the RF power amplifier tube and other key components from being damaged by reflected RF signals, it is usually necessary to set up a standing wave detection link to monitor the standing wave in real time. When the standing wave is too large to cause reflection When the power of the signal exceeds the threshold, it will protect the power amplifier by reducing the power or shutting down the power amplifier. Therefore, standing wave detection plays an important role in protecting the normal operation of power amplifier tubes and wireless communication equipment.

In the existing technology, the standing wave detection of the time division duplex wireless communication system requires additional hardware circuits such as mixers, operational amplifiers, and analog-to-digital converters, and requires a dedicated link for the transmission and detection of reflected signals, resulting in complex links. ,higher cost.

In view of the time division duplex wireless communication system in the related art, additional hardware circuits such as mixers, operational amplifiers, and analog-to-digital converters are required, and special links are required for the transmission and detection of reflected signals, resulting in complex links and relatively high costs. High problem, no solution proposed yet.

Contents of the invention

Embodiments of the present disclosure provide a standing wave detection method and device to at least solve the problem that the time-division duplex wireless communication system in the related art needs to add additional hardware circuits such as mixers, operational amplifiers, and analog-to-digital converters, and requires a dedicated link. The path is used for the transmission and detection of the reflected signal, which leads to the problem of complex link and high cost.

According to an embodiment of the present disclosure, a standing wave detection method is provided, including:

Under the transmission time slot, the reflected signal of the antenna port is combined into the receiving link through the combining network to obtain the reverse power of the reflected signal;

Perform standing wave detection on the reflected signal according to the reverse power.

In an exemplary embodiment, performing standing wave detection on the reflected signal according to the reverse power includes:

performing coupling sampling on the transmitted signal through a forward coupler to obtain forward power;

Determine an antenna port standing wave value according to the forward power and the reverse power.

In an exemplary embodiment, determining the standing wave value of the antenna port according to the forward power and the reverse power includes:

Obtaining the insertion loss of the forward detection link and the insertion loss of the reverse detection link, wherein the insertion loss of the forward detection link is the ratio of the transmit power of the antenna port to the forward power, and the reverse detection link The link insertion loss is the ratio of the transmit power to the reverse power;

The standing wave value of the antenna port is determined according to the insertion loss of the forward detection link, the insertion loss of the reverse detection link, the forward power, and the reverse power.

In an exemplary embodiment, the standing wave at the antenna port is determined according to the insertion loss of the forward detection link, the insertion loss of the reverse detection link, the forward power, and the reverse power by the following formula value:

Wherein, VSWR is the standing wave value of the antenna port, Pd_fwd is the forward power, Pd_rev is the reverse power, IL_fwd is the insertion loss of the forward detection link, IL_rev is the insertion loss of the reverse detection link loss.

According to another embodiment of the present disclosure, a standing wave detection device is provided, including: a combining network and a processor, the combining network is electrically connected to the processor, wherein,

The combining network is used to combine the reflected signal of the antenna port into the receiving link under the transmitting time slot to obtain the reverse power of the reflected signal, and output the forward power to the processor;

The processor is configured to perform standing wave detection on the reflected signal according to the reverse power.

In an exemplary embodiment, the device further includes a forward coupler, wherein the forward coupler is connected to the processor,

The forward coupler is configured to couple and sample the transmit signal to obtain forward power, and output the forward power to the processor;

The processor is further configured to perform standing wave detection according to the forward power and the reverse power.

In an exemplary embodiment, the processor is further configured to acquire a forward detection link insertion loss and a reverse detection link insertion loss, wherein the forward detection link insertion loss is the The ratio of transmit power to the forward power, the reverse detection link insertion loss is the ratio of the transmit power to the reverse power; according to the forward detection link insertion loss, the reverse detection The link insertion loss, the forward power and the reverse power determine the standing wave value of the antenna port.

In an exemplary embodiment, the processor is further configured to use the following formula according to the insertion loss of the forward detection link, the insertion loss of the reverse detection link, the forward power, and the reverse The power determines the VSWR value of the antenna port:

In an exemplary embodiment, the combining network is composed of at least one of a directional coupler, a diode (Positive-intrinsicnegative, PIN for short) switch, a bridge, a power divider, an adjustable attenuator, and an attenuator, and Composition of RF switches.

In an exemplary embodiment, the processor includes at least one of the following: an analog-to-digital converter (Analog-to-Digital Conver, ADC for short), a wave detector, and a transceiver module.

In the embodiment of the present disclosure, under the transmission time slot, the reflected signal of the antenna port is combined into the receiving link through the combining network to obtain the reverse power of the reflected signal; the standing wave is performed on the reflected signal according to the reverse power. Detection can solve the problem that the time-division duplex wireless communication system in related technologies requires additional hardware circuits such as mixers, operational amplifiers, and analog-to-digital converters, and requires a dedicated link for the transmission and detection of reflected signals, resulting in complex links. , The problem of high cost, the receiving link is multiplexed, and the receiving link is used to transmit the reverse power in the downlink time slot, which simplifies the standing wave detection link, saves the wiring area, and does not require mixers, operational amplifiers and other devices , On the premise of ensuring the function, the cost is greatly reduced.

Description of drawings

FIG. 1 is a flow chart of a standing wave detection method according to an embodiment of the present disclosure;

Fig. 2 is the block diagram of the standing wave detection device according to the present embodiment;

Fig. 3 is a block diagram of a standing wave detection device according to this optional embodiment;

FIG. 4 is a schematic diagram of a novel standing wave detection according to the present embodiment;

Fig. 5 is a schematic diagram of a novel standing wave detection according to this alternative embodiment.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings and in combination with the embodiments.

It should be noted that the terms "first" and "second" in the specification and claims of the present disclosure and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

In this embodiment, a standing wave detection method is provided. FIG. 1 is a flowchart of a standing wave detection method according to an embodiment of the present disclosure. As shown in FIG. 1 , the process includes the following steps:

Step S102, under the transmission time slot, combine the reflected signal of the antenna port into the receiving link through the combining network to obtain the reverse power of the reflected signal;

Step S104, performing standing wave detection on the reflected signal according to the reverse power.

Through the above steps S102 to S104, under the transmission time slot, the reflected signal of the antenna port is combined into the receiving link through the combining network to obtain the reverse power of the reflected signal; according to the reverse power, the reflected signal is performed Standing wave detection can solve the problem that time-division duplex wireless communication systems in related technologies need to add additional hardware circuits such as mixers, operational amplifiers, and analog-to-digital converters, and require special links for the transmission and detection of reflected signals, resulting in chain To solve the problem of complex path and high cost, the receiving link is multiplexed, and the receiving link is used to transmit reverse power in the downlink time slot, which simplifies the standing wave detection link, saves the wiring area, and does not require mixers and op amps And other devices, greatly reducing the cost under the premise of ensuring the function.

In an exemplary embodiment, the above step S104 may specifically include:

S1041. Perform coupling sampling on the transmit signal through a forward coupler to obtain forward power;

S1042. Determine the standing wave value of the antenna port according to the forward power and the reverse power, and further obtain the insertion loss of the forward detection link and the insertion loss of the reverse detection link; according to the insertion loss of the forward detection link, Loss, the insertion loss of the reverse detection link, the forward power and the reverse power determine the standing wave value of the antenna port. Further, the standing wave value of the antenna port can be determined by the following formula:

This embodiment is used in a wireless communication system working in Time Division Duplexing (TDD for short) mode. In the transmission link, the power amplifier (Power Amplifier, referred to as PA) amplifies the small RF signal of the pre-stage, and the high-power RF signal output by the power amplifier reaches the antenna port after passing through the circulator. When the antenna port is mismatched, the standing wave deteriorates, and the power of the reflected signal at the antenna port increases sharply. In order to protect the RF power amplifier tube and other key components of the transceiver link from being damaged by the high power of the reflected signal, it is necessary to detect the The standing wave at the antenna port is monitored in real time. When the standing wave exceeds a certain threshold, it is necessary to reduce the power or turn off the power amplifier.

Another embodiment of the present disclosure provides a standing wave detection device. FIG. 2 is a block diagram of the standing wave detection device according to this embodiment. As shown in FIG. 2 , it includes: a combining network 22 and a processor 24, so The combining network 22 is electrically connected to the processor 24, wherein,

The combining network 22 is used to combine the reflected signal of the antenna port into the receiving link to obtain the reverse power of the reflected signal under the transmitting time slot, and output the forward power to the processor 24 ;

The processor 24 is configured to perform standing wave detection on the reflected signal according to the reverse power.

FIG. 3 is a block diagram of a standing wave detection device according to this optional embodiment. As shown in FIG. 3 , the device further includes a forward coupler 32, wherein the forward coupler 32 is connected to the processor 24 ,

The forward coupler 32 is configured to couple and sample the transmit signal to obtain forward power, and output the forward power to the processor 24;

The processor 24 is further configured to perform standing wave detection according to the forward power and the reverse power.

In an exemplary embodiment, the processor 24 is further configured to obtain the forward detection link insertion loss and the reverse detection link insertion loss, wherein the forward detection link insertion loss is the antenna port The ratio of the transmit power to the forward power, the reverse detection link insertion loss is the ratio of the transmit power to the reverse power; according to the forward detection link insertion loss, the reverse Detecting link insertion loss, the forward power and the reverse power to determine the standing wave value of the antenna port.

In an exemplary embodiment, the processor 24 is further configured to use the following formula according to the insertion loss of the forward detection link, the insertion loss of the reverse detection link, the forward power, and the reverse Determine the standing wave value of the antenna port to the power:

In an exemplary embodiment, the combining network 22 is composed of at least one of directional couplers, PIN switches, bridges, power splitters, adjustable attenuators, attenuators and other devices, and a function composed of radio frequency switches circuit.

In an exemplary embodiment, the processor 24 includes at least one of the following devices: an ADC, a wave detector, a transceiver module and the like.

Fig. 4 is a schematic diagram of the novel standing wave detection according to the present embodiment, as shown in Fig. 4 , including: a forward coupler 101 (corresponding to the above-mentioned forward coupler 32), a radio frequency switch module 102, and a combining network 103 (corresponding to the above-mentioned Combiner network 22) and power detection and processing module 104 (corresponding to the above-mentioned processor 24), wherein the RF signal (i.e. reflected signal) is connected to the forward coupler 101 through a power amplifier (Power Amplifier, referred to as PA), and the forward The coupler 101 is respectively connected to the antenna and the radio frequency switch module 102 through a circulator, and the radio frequency switch module 102 is respectively connected to the combining network 103 and the power detection and processing module 104, specifically through a low noise amplifier (Low noise Amplifier, referred to as LNA) and Combined network 103 is connected.

The forward coupler 101 is configured to couple and sample the transmit signal to obtain forward power, so as to detect real-time transmit power. The forward coupler 101 includes but is not limited to microstrip line couplers, stripline couplers, waveguide couplers and other circuits, devices and external devices, all circuits, devices and external devices that use coupling methods to sample transmission power All belong to the protection category of this module.

The RF switch module 102 is used to switch between the receiving link and the reverse power detection link. The RF switch module 102 includes but is not limited to a single-pole double-throw RF switch, and all devices that can switch between different links Circuits and circuits all belong to the protection category of this module; devices integrated in the low-noise amplifier chip or combining network and capable of switching between different links also belong to the protection category of this module.

The combining network 103 is used to adjust the insertion loss value of the reflected signal link and combine the reflected signal into the receiving link to obtain reverse power. The combining network 103 includes but is not limited to a directional coupler, a diode PIN switch, a bridge, At least one of the power splitter, adjustable attenuator, and attenuator, and a functional circuit composed of a radio frequency switch, all devices and circuits that can adjust the insertion loss value of the reflected signal link and combine the reflected signal into the receiving link belong to this category Module protection category.

The power detection and processing module 104 is configured to receive forward power and reverse power and process them to obtain real-time standing wave values. The power detection and processing module 104 includes, but is not limited to, a functional circuit composed of at least one of devices such as ADC, detector, and transceiver module. All devices and circuits that can realize forward and reverse signal power detection and processing belong to this Module protection category.

For the couplers involved in this embodiment, the value ranges of the main parameters such as coupling degree, insertion loss, and isolation degree, as long as the functions of standing wave detection and calculation can be realized under the scheme proposed in this disclosure, they are all considered to be included in the scope of this disclosure. Within the scope of protection; the attenuators and adjustable attenuators involved, the value ranges of their main parameters such as attenuation value and return loss, as long as the functions of standing wave detection and calculation can be realized under the scheme proposed in this disclosure, they are all deemed to be in the Within the protection scope of this embodiment.

When the system works in the downlink time slot, the radio frequency switch module 102 switches to the combiner network terminal 6 . For the transmission signal output by the power amplifier PA, the forward power Pd_fwd is collected through the coupling end of the forward coupler 101 and the collected power is sent to the power detection and processing module 104, while the signal power P_rev reflected back from the antenna port passes through the radio frequency switch module 102 and the combining network 103 are combined into the receiving link to obtain the reverse power Pd_rev and sent to the power detection and processing module 104 . The power detection and processing module 104 calculates and processes the received forward power Pd_fwd and reverse power Pd_rev, and finally obtains the antenna port standing wave value of the current downlink time slot.

The calculation formula for calculating the standing wave value of the antenna port through the forward power Pd_fwd and the reverse power Pd_rev is (the power units are all watts):

Among them, VSWR is the final standing wave value of the antenna port;

Pd_fwd is the forward power detected by the power detection and processing module;

Pd_rev is the reverse power detected by the power detection and processing module;

IL_fwd is the insertion loss of the forward detection link, that is, the ratio of the antenna port transmit power P_fwd to the forward power Pd_fwd, which can generally be known in advance by calibration or calculation;

IL_rev is the insertion loss of the reverse detection link, that is, the ratio of the reflected power P_rev of the antenna port to the reverse power Pd_rev, which can generally be known in advance by calibration or calculation;

Therefore, according to the above formula, the standing wave value of the antenna port can be calculated through the forward power Pd_fwd and reverse power Pd_rev.

Figure 5 is a schematic diagram of a novel standing wave detection according to this optional embodiment, as shown in Figure 5, including: forward coupler 201 (forward coupler 101), radio frequency switch module 202 (radio frequency switch module 102), combined Road network 203 (corresponding to the above combined circuit network 103) and power detection and processing module 204 (corresponding to power detection and processing module 104), wherein, the RF signal (i.e. reflected signal) is connected to the forward coupler 201 through the amplifier PA, and the forward The coupler 201 is respectively connected to the antenna and the radio frequency switch module 202 through the circulator, and the radio frequency switch module 202 is respectively connected to the combining network 203 and the power detection and processing module 204, specifically connected to the combining network 203 through the attenuator.

When the system works in the downlink time slot, the transmitted signal is input from port 1 of the circulator, output from port 2 and sent to the antenna after passing through the power amplifier, and the 30dB forward coupler 201 collects the forward power P2 through the coupling Send to the power detection and processing module (ADC chip in this embodiment) 204.

At the same time, the power of the reflected signal at the antenna port enters from port 2 of the circulator, outputs from port 3 and reaches port 4 of the SPDT switch 202 . Now the SPDT switch 202 is switched to port 6, and the power of the reflected signal enters the combining network 203 after outputting from the port 6 of the SPDT switch 202 (combining network comprises a 10dB attenuator and a 20dB reverse coupler in this embodiment Combination) through the 10dB attenuator, and then through the coupling end of the reverse coupler to sample the output signal of the 10dB attenuator to obtain the reverse power P1 and output it to the ADC chip 204 through the receiving link. The ADC chip 204 detects and calculates the received forward power P2 and reverse power P1 to obtain the antenna port standing wave value of the current downlink time slot. The following describes and calculates the standing wave at the antenna port in the embodiment according to the above formula:

The ADC chip detects the forward power Pd_fwd=P2=21dBm, the reverse power Pd_rev=P1=-2dBm, assuming that the forward detection link insertion loss IL_fwd=29dB is obtained through pre-calibration, and the reverse detection link insertion loss IL_rev=32dB , put the above parameters into the above formula, and get:

That is, the standing wave value of the current antenna port is 1.22.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned disclosure can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network composed of multiple computing devices In fact, they can be implemented in program code executable by a computing device, and thus, they can be stored in a storage device to be executed by a computing device, and in some cases, can be executed in an order different from that shown here. Or described steps, or they are fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present disclosure is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

A standing wave detection method, comprising:

Under the transmission time slot, the reflected signal of the antenna port is combined into the receiving link through the combining network to obtain the reverse power of the reflected signal;

Perform standing wave detection on the reflected signal according to the reverse power.
The method according to claim 1, wherein performing standing wave detection on the reflected signal according to the reverse power comprises:

performing coupling sampling on the transmitted signal through a forward coupler to obtain forward power;

Determine an antenna port standing wave value according to the forward power and the reverse power.
The method according to claim 2, wherein determining the antenna port standing wave value according to the forward power and the reverse power comprises:

Obtaining the insertion loss of the forward detection link and the insertion loss of the reverse detection link, wherein the insertion loss of the forward detection link is the ratio of the transmit power of the antenna port to the forward power, and the reverse detection link The link insertion loss is the ratio of the transmit power to the reverse power;

The standing wave value of the antenna port is determined according to the insertion loss of the forward detection link, the insertion loss of the reverse detection link, the forward power, and the reverse power.
The method according to claim 3, wherein the antenna is determined according to the forward detection link insertion loss, the reverse detection link insertion loss, the forward power and the reverse power by the following formula Port standing wave value:

Wherein, VSWR is the standing wave value of the antenna port, Pd_fwd is the forward power, Pd_rev is the reverse power, IL_fwd is the insertion loss of the forward detection link, IL_rev is the insertion loss of the reverse detection link loss.
A standing wave detection device, comprising: a combining network and a processor, the combining network is electrically connected to the processor, wherein,

The combining network is used to combine the reflected signal of the antenna port into the receiving link under the transmitting time slot to obtain the reverse power of the reflected signal, and output the reverse power to the processor;

The processor is configured to perform standing wave detection on the reflected signal according to the reverse power.
The apparatus of claim 5, wherein the apparatus further comprises a forward coupler, wherein the forward coupler is connected to the processor,

The forward coupler is configured to couple and sample the transmit signal to obtain forward power, and output the forward power to the processor;

The processor is further configured to perform standing wave detection according to the forward power and the reverse power.
The apparatus of claim 6, wherein,

The processor is further configured to obtain a forward detection link insertion loss and a reverse detection link insertion loss, wherein the forward detection link insertion loss is the transmission power of the antenna port and the forward power The ratio of the reverse detection link insertion loss is the ratio of the transmit power to the reverse power; according to the forward detection link insertion loss, the reverse detection link insertion loss, the front The directional power and the reverse power determine the standing wave value of the antenna port.
The apparatus according to claim 7, wherein,

The processor is further configured to determine the standing wave at the antenna port according to the insertion loss of the forward detection link, the insertion loss of the reverse detection link, the forward power, and the reverse power by using the following formula value:

Wherein, VSWR is the standing wave value of the antenna port, Pd_fwd is the forward power, Pd_rev is the reverse power, IL_fwd is the insertion loss of the forward detection link, IL_rev is the insertion loss of the reverse detection link loss.
Apparatus according to any one of claims 5 to 8, wherein,

The combining network is composed of a directional coupler, a diode PIN switch, a bridge, a power divider, an adjustable attenuator, at least one of the attenuators, and a radio frequency switch.
Apparatus according to any one of claims 5 to 8, wherein,

The processor includes at least one of the following: an analog-to-digital converter ADC, a wave detector, and a transceiver module.