WO2018176201A1

WO2018176201A1 - Radio frequency channel calibration apparatus and method

Info

Publication number: WO2018176201A1
Application number: PCT/CN2017/078328
Authority: WO
Inventors: 冷舜; 庄桂春; 冯云; 谭胜斌
Original assignee: 华为技术有限公司
Priority date: 2017-03-27
Filing date: 2017-03-27
Publication date: 2018-10-04
Also published as: CN109845145A

Abstract

Provided are a radio frequency channel calibration apparatus and method, which relate to the technical field of communications and are used for improving the loop accuracy of radio frequency channel calibration. The apparatus comprises a radio frequency unit, a calibration unit and a processing unit, wherein the radio frequency unit and the calibration unit are respectively connected to the processing unit; the calibration unit comprises a coupling network; the radio frequency unit is connected to the coupling network via a feed line; the radio frequency unit comprises M transmitting channels, and is used for sending calibration signals via the M transmitting channels, M being a positive integer greater than or equal to 2; the coupling network is used for coupling the calibration signals sent by the M transmission channels into one signal; the calibration unit further comprises a calibration channel, and is used for receiving one signal output by the coupling network via the calibration channel; and the processing unit is used for determining a transmission phase difference of the M transmitting channels, and calibrating a corresponding transmitting channel based on the transmission phase difference of the M transmitting channels.

Description

Radio frequency channel calibration device and method

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a radio frequency channel calibration apparatus and method.

Background technique

With the rapid development of communication technologies, more and more devices for communication have appeared. These devices are usually integrated with radio frequency modules, which can also be called radio frequency transceivers for receiving and transmitting signals. One RF module can correspond to multiple RF channels, the channel used to receive signals can be referred to as a receive channel, and the channel used to transmit signals can be referred to as a transmit channel. In RF module applications, due to device processing, aging, and temperature changes, the same signal through different transmit channels or receive channels has a certain phase difference. Therefore, the RF channel needs to be calibrated.

At present, when performing RF channel calibration, only the RF channel of the RF module itself is usually calibrated. In practical applications, the RF module is connected to the antenna through the feeder, and the feeder connected to the RF module and the antenna is also in the signal transmission process. The signal produces a certain phase difference, so only the RF channel of the RF module itself is calibrated, which is less accurate.

Summary of the invention

Embodiments of the present invention provide a radio frequency channel calibration apparatus and method, which solves the problem of low loop accuracy of radio frequency channel calibration in the prior art.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, a radio frequency channel calibration apparatus is provided. The apparatus includes a radio frequency unit, a calibration unit, and a processing unit. The radio frequency unit and the calibration unit are respectively connected to the processing unit. The calibration unit includes a coupling network, and the radio frequency unit is connected to the coupling network through the feeder. The radio frequency unit includes M transmitting channels for transmitting calibration signals through M transmitting channels, M is a positive integer greater than or equal to 2; the coupling network couples the calibration signals sent by the M transmitting channels into one signal; the calibration unit further includes And a calibration channel, configured to receive, by the calibration channel, a signal output by the coupled network; a processing unit configured to determine a transmit phase difference of the M transmit channels, and calibrate the corresponding transmit channel based on a transmit phase difference of the M transmit channels.

In conjunction with the first aspect, in a first possible implementation of the first aspect, the calibration unit further includes a calibration processing module for providing a calibration channel.

In conjunction with the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the calibration processing module includes a baseband processor, a filter, and a power amplifier.

In a second aspect, a radio frequency channel calibration apparatus is provided. The apparatus includes a radio frequency unit, a calibration unit, and a processing unit. The radio frequency unit and the calibration unit are respectively connected to the processing unit. The calibration unit includes a coupling network, and the radio frequency unit is connected to the coupling network through the feeder line. The calibration unit further includes a calibration channel for transmitting the calibration signal through the calibration channel, and a coupling network for splitting the calibration signal into N signals, where N is greater than or equal to 2. A positive integer; the radio unit includes N receiving channels for respectively receiving N signals through N receiving channels; a processing unit for determining a receiving phase difference of the N receiving channels, and calibrating based on receiving phase differences of the N receiving channels Corresponding receiving channel.

In conjunction with the second aspect, in a first possible implementation of the second aspect, the calibration unit further includes a calibration processing module, the calibration processing module is configured to provide a calibration channel.

In conjunction with the first possible implementation of the second aspect, in a second possible implementation of the second aspect, the calibration processing module includes a baseband processor, a filter, and a power amplifier.

In a third aspect, a radio frequency channel calibration method is provided for applying to a radio frequency channel calibration apparatus, the method comprising: transmitting a calibration signal through M transmission channels; coupling the calibration signals sent by the M transmission channels into one signal, and passing the calibration channel Receiving the one signal; determining a transmission phase difference of the M transmission channels, and calibrating the corresponding transmission channel based on the transmission phase differences of the M transmission channels.

With reference to the third aspect, in a first possible implementation manner of the third aspect, before receiving the one signal by using the calibration channel, the method further includes: configuring a frequency of the calibration channel according to carrier frequency information of the M transmitting channels Point information.

In a fourth aspect, a radio frequency channel calibration method is provided, which is applied to an RF channel calibration apparatus, the method comprising: calibrating a calibration signal sent by the calibration channel, and dividing the calibration signal into N signals, where N is a positive integer greater than or equal to 2. N signals are respectively passed through N receiving channels; the receiving phase differences of the N receiving channels are determined, and the corresponding receiving channels are calibrated based on the received phase differences of the N receiving channels.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, before the N signals are received by the N receiving channels, the method further includes: configuring the calibration channel according to the carrier frequency information of the N receiving channels Frequency information.

In a fifth aspect, an apparatus is provided, the apparatus comprising a radio frequency unit, a calibration unit and a processor, the radio frequency unit and the calibration unit are respectively connected to the processing unit, the calibration unit comprises a coupling network, the radio frequency unit is connected to the coupling network through the feeder, the radio frequency unit, a calibration unit and processor for supporting the apparatus to perform the radio frequency channel calibration method provided by the first aspect or the first possible implementation of the third aspect, and/or for supporting the apparatus to perform the fourth aspect or the fourth The first possible implementation of the aspect provides a radio frequency channel calibration method.

The radio frequency channel calibration apparatus and method provided by the embodiment of the present invention, the radio frequency channel calibration apparatus includes a radio frequency unit connected to the calibration network included in the calibration unit through the feeder line, and can be passed when the radio frequency channel included in the radio frequency channel calibration apparatus is calibrated. The calibration channel provided by the calibration unit performs RF channel calibration, which not only calibrates the phase difference introduced by the RF unit itself, but also calibrates the phase difference introduced by the feeder, thereby improving the loop accuracy of the RF channel calibration of the RF unit. .

DRAWINGS

1 is a schematic diagram of a connection of a radio remote unit;

2 is a schematic structural diagram of a radio frequency channel calibration apparatus according to an embodiment of the present invention;

3 is a schematic structural diagram of a calibration unit according to an embodiment of the present invention;

4 is a schematic structural diagram of another calibration unit according to an embodiment of the present invention;

FIG. 5 is a flowchart of a radio frequency channel calibration method according to an embodiment of the present invention;

FIG. 6 is a flowchart of processing a calibration signal according to an embodiment of the present invention;

FIG. 7 is a flowchart of another RF channel calibration method according to an embodiment of the present invention;

FIG. 8 is a flowchart of processing of another calibration signal according to an embodiment of the present invention.

detailed description

Before introducing the embodiments of the present invention, the technical terms involved in the present application are first introduced.

A radio frequency unit, also known as a radio frequency circuit, can be used to connect multiple antennas. In the embodiment of the present invention, the radio unit may be a radio remote unit (RRU), and one RRU may include multiple transmit channels and multiple receive channels. For example, the RRU of 4T4R includes 4 transmit channels and 4 The receiving channel, the 2RU2 RRU includes 2 transmitting channels and 2 receiving channels. As shown in FIG. 1 , taking an RRU of 4T4R as an example, the RRU may be connected to multiple antennas through a radio frequency connector, and the multiple antennas may be multiple antenna arrays. Optionally, the RF unit includes, but is not limited to, a filter, a low noise amplifier (LNA), an analog-to-digital/digital-to-analogue (A/D or D/). A) Converters, etc.

The calibration signal is the signal used to perform phase calibration of the RF channel. The calibration signal may be a random signal or a pseudo-noise (PN) signal.

2 is a schematic structural diagram of a radio frequency channel calibration apparatus according to an embodiment of the present invention. As shown in FIG. 2, the radio frequency channel calibration apparatus includes a radio frequency unit 101, a calibration unit 102, and a processing unit 103, and a radio frequency unit 101 and a calibration unit 102. Connected to the processing unit 103, the calibration unit 102 includes a coupling network 1021, and the radio frequency unit 101 is connected to the coupling network 1021 via a feeder.

In the embodiment of the present invention, the radio frequency channel calibration apparatus shown in FIG. 2 can be used to calibrate the transmission channel of the radio frequency unit 101, as described below.

The radio frequency unit 101 includes M transmitting channels for transmitting calibration signals through M transmitting channels, where M is an integer greater than or equal to 2. In practical applications, the radio frequency unit 101 can be a radio remote unit RRU, and the RRU can specifically perform optical transmission modulation and demodulation, digital up-conversion, A/D, D/A conversion, etc., and complete conversion of the intermediate frequency signal to the radio frequency signal. Then, the power amplifier filtering process is performed, and finally the radio frequency signal is transmitted through the antenna. Specifically, the radio frequency unit 101 is connected to the coupling network 1021 of the calibration unit 102 through a feeder. The radio frequency unit 101 transmits a calibration signal through the M transmission channels, and the calibration signal is transmitted to the coupling network 1021 of the calibration unit 102 via the feeder.

The coupling network 1021 is configured to couple the calibration signals sent by the M transmission channels into one signal, and the calibration unit 102 further includes a calibration channel for receiving a signal output by the coupling network 1021 through the calibration channel. As shown in FIG. 3, which is a schematic structural diagram of the calibration unit 102, the calibration unit 102 can include a coupling 1021 and a calibration processing module 1022 for providing a calibration channel. The coupling network 1021 is configured to couple the calibration signals sent by the M transmitting channels into one signal, and the calibration processing module 1022 is configured to perform filtering and power amplifier processing on a signal obtained by coupling.

Specifically, as shown in FIG. 4, the calibration processing module 1022 can include a baseband processor, a filter, and a power amplifier. In FIG. 4, taking the RF unit 101 as an example of four transmission channels, the coupling network 1021 in the calibration unit 102 is used to couple the input four calibration signals into one signal. The filter in the calibration processing module 1022 is configured to filter a signal of the coupled output, the power amplifier is used for power amplification of the filtered signal, and the baseband processing unit is configured to perform processing such as sampling the filtered signal.

The processing unit 103 is configured to determine a transmit phase difference of the M transmit channels, and calibrate the corresponding transmit channel based on the transmit phase differences of the M transmit channels. The processing unit 103 may be a baseband unit (BBU), and specifically may determine the transmit phase difference of the M transmit channels according to the signal sampled by the calibration unit 102 and the calibration signal sent by the M transmit channels, and then according to The transmit phase differences of the M transmit channels calibrate the corresponding transmit channels.

Optionally, the calibration unit 102 may also be configured to determine a transmission phase difference of the M transmission channels, and after determining, transmit the transmission phase difference of the M transmission channels to the processing unit 103, and the processing unit 103 is configured according to the M transmissions. The transmit phase difference of the channel calibrates the corresponding transmit channel.

Optionally, the calibration signal sent by the radio frequency unit 101 may be generated by the processing unit 103, and the generated calibration signal is sent to the radio frequency unit 101.

In the channel calibration apparatus provided by the embodiment of the present invention, the radio frequency unit transmits a calibration signal through M transmitting channels, and the coupling network is used to couple the calibration signals sent by the M transmitting channels into one signal, and the calibration unit receives the output of the coupled network through the calibration channel. a signal, the processing unit determines the transmit phase difference of the M transmit channels, and calibrates the corresponding transmit channel based on the transmit phase differences of the M transmit channels, so that when the RF channel is calibrated by the calibration channel provided by the calibration unit, not only the RF unit can be The phase difference introduced by itself is calibrated, and the phase difference introduced by the feeder can also be calibrated, thereby improving the loop accuracy of the RF channel calibration.

In the embodiment of the present invention, the radio frequency channel calibration apparatus shown in FIG. 2 can be used to calibrate the receiving channel of the radio frequency unit 101, as described below.

The calibration unit 102 can be coupled to the network 1021 and the calibration processing module 1022 for providing a calibration channel. Specifically, the calibration processing module 1022 is configured to provide a calibration channel, and send a calibration signal through the calibration channel. The coupling network 1021 is configured to split the calibration signal into N signals, and transmit the N signals to the RF unit 101 through the feeder. N is an integer greater than or equal to 2.

Specifically, as shown in FIG. 4, the calibration processing module 1022 can include a baseband processor, a filter, and a power amplifier. The baseband processor can be used for intermediate frequency conversion of the calibration signal, and the power amplifier is used for power amplification of the calibration signal. Filtering the amplified signal. In FIG. 4, the radio frequency unit includes four receiving channels as an example. The coupling network 1021 is configured to divide the processed calibration signal into four signals, each signal corresponding to one receiving channel of one radio frequency unit 101, and then Four signals are transmitted to the radio frequency unit 101 through the feeder.

It should be noted that, when transmitting channel calibration and receiving channel calibration, the calibration unit 102 can be the calibration unit shown in FIG. 3 or FIG. 4, that is, the calibration unit 102 has the same hardware composition when transmitting channel calibration and receiving channel calibration. The difference is that the processing flow of the calibration signal is different.

The radio unit 101 includes N receiving channels for receiving N signals through N receiving channels. Specifically, the radio frequency unit 101 can be connected to the coupling network 1021 through a feeder. After the calibration signal sent by the calibration unit 102 through the calibration channel is divided into N signals through the coupling network 1021, the N signals are transmitted to the radio frequency unit 101 via the feeder, and the radio unit 101 respectively receives the N signals through the N receiving channels. In an actual application, the radio frequency unit 101 may be an RRU, and the signal processing flow when the signal is received is opposite to the processing flow when the signal is transmitted. For details, refer to the related description, which is not described herein.

The processing unit 103 is configured to determine a receiving phase difference of the N receiving channels, and based on the N receiving channels Receive the receiving channel corresponding to the phase difference calibration. The processing unit 103 may be a baseband processing unit BBU, and specifically may determine the receiving phase difference of the N receiving channels according to the calibration signal sent by the calibration unit 102 and the calibration signal received by the radio frequency unit 101 through the N receiving channels, and then according to The receiving phase difference of the N receiving channels calibrates the corresponding receiving channel.

Optionally, the calibration unit 102 may also be configured to determine a received phase difference of the N receiving channels, and send the received phase difference of the N receiving channels to the processing unit 103 after the determining, according to the N receiving by the processing unit 103. The receiving phase difference of the channel calibrates the corresponding receiving channel.

Optionally, the calibration signal sent by the calibration unit 102 may be generated by the processing unit 103, and the generated calibration signal is sent to the calibration unit. Alternatively, the calibration unit 102 may further include a calibration signal generator, and the calibration unit 102 generates the calibration signal. The calibration signal is generated by the device in the embodiment of the present invention.

In the channel calibration apparatus provided by the embodiment of the present invention, the calibration unit sends a calibration signal through the calibration channel, and the coupling network splits the calibration signal into N signals, and the radio frequency unit respectively receives the N signals through the N receiving channels, and the processing unit determines N. The receiving phase difference of the receiving channels, and calibrating the corresponding receiving channels based on the receiving phase differences of the N receiving channels, so that the RF channel calibration can be calibrated only by the calibration channel provided by the calibration unit for the RF channel calibration. The phase difference introduced by the feeder can also be calibrated, thereby improving the loop accuracy of the RF unit receiving channel calibration.

FIG. 5 is a flowchart of a radio frequency channel calibration method according to an embodiment of the present invention. Referring to FIG. 5, the method is applied to a radio frequency channel calibration apparatus, and specifically includes the following steps.

Step 301: Send a calibration signal through M transmitting channels, where M is an integer greater than or equal to 2.

Wherein, when it is required to calibrate M transmission channels, a calibration signal can be transmitted through the M transmission channels. The calibration signal can be a random signal or a PN signal. For example, the calibration signal may be a superimposition of the 10ms trigger feed small signal and the traffic signal, and the feed time may be several seconds or longer. Alternatively, the calibration signal is a 10ms trigger feeding a superposition of a small signal and a large signal, and the feed time may be several hundred microseconds to several milliseconds.

Specifically, the process of transmitting the calibration signal through the M transmission channels can be as shown in FIG. 6. The calibration signal is obtained by the RF unit of the RF channel calibration device, and the calibration signal may be sent by the processing unit to the RF unit. The calibration signal is processed through a baseband cpri interface into a processing chip (eg, an FPGA) of the radio unit to obtain an intermediate frequency (IF) digital signal. After processing, it is converted into an analog signal by a digital to analog converter (DAC), and then transmitted through the transmitting circuit TX and the duplexer DUP.

Step 302: Coupling the calibration signals sent by the M transmitting channels into one signal, and receiving the one signal through the calibration channel.

When the RF channel calibration device transmits the calibration signal through the M transmission channels, the RF channel calibration device can couple the calibration signals sent by the M transmission channels into one signal through the coupling network, and receive the signal through the calibration channel. Specifically, the process of the calibration unit of the RF channel calibration device receiving the calibration signals sent by the M transmission channels through the calibration channel may be as shown in FIG. 6. The calibration unit couples the calibration signals sent by the M transmit channels into one signal, which is converted into a digital signal by an analog-to-digital converter (ADC) after receiving the circuit RX, and then digitally sampled by the IF. To get the final received signal.

Step 303: Determine a transmission phase difference of the M transmission channels, and based on transmission phases of the M transmission channels The difference corresponds to the corresponding transmit channel.

Wherein, after the RF channel calibration device receives the calibration signals sent by the M transmission channels through the calibration channel, the transmission phase difference of the M transmission channels may be determined according to the calibration signals sent by the M transmission channels and the received signals. Thereafter, the corresponding transmission channel can be calibrated according to the transmission phase difference of the M transmission channels.

Specifically, the process of determining the phase difference of the transmission of the M transmitting channels by the RF channel calibration device may be performed by the calibration unit, or may be performed by an independent processing unit. When the calibration unit determines the phase difference of the transmission of the M transmitting channels, The calibration unit can send it to the processing unit after it has been determined. Finally, the processing unit calibrates the corresponding transmit channel based on the transmit phase differences of the M transmit channels. For example, as shown in FIG. 6, the processing unit of the radio frequency channel calibration apparatus may be a BBU, and the BBU calibrates the corresponding transmission channel based on the transmission phase difference of the M transmission channels.

Further, before the RF channel calibration device performs the RF channel calibration, the frequency point information of the calibration channel may be configured according to the carrier frequency information of the M transmission channels, so as to improve the receiving power of the calibration signal sent by the calibration channel receiving the transmission channel. This improves the loop accuracy of the RF channel calibration.

The radio frequency channel calibration method provided by the embodiment of the present invention transmits a calibration signal through M transmitting channels, couples the calibration signals sent by the M transmitting channels into one signal, and receives the one signal through the calibration channel, and then determines the M transmitting channels. Transmitting the phase difference and calibrating the corresponding transmitting channel based on the transmitting phase difference of the M transmitting channels, so that when the RF channel is calibrated by the calibration channel provided by the calibration unit, not only the phase difference introduced by the RF unit itself but also the phase difference can be calibrated. The phase difference introduced by the feeder is calibrated to improve the loop accuracy of the RF unit transmit channel calibration.

FIG. 7 is a flowchart of another RF channel calibration method according to an embodiment of the present invention. Referring to FIG. 7, the method is applied to a radio frequency channel calibration apparatus, and specifically includes the following steps.

Step 401: The calibration signal sent by the calibration channel is split and the calibration signal is split into N signals.

Wherein, when it is required to calibrate the receiving channel included in the RF channel calibration device, the RF channel calibration device can pass the calibration signal sent by the calibration channel and split the calibration signal into N signals. The calibration signal can be a random signal or a PN signal. For example, the calibration signal may be a superimposition of the 10ms trigger feed small signal and the traffic signal, and the feed time may be several seconds or longer. Alternatively, the calibration signal is a 10ms trigger feeding a superposition of a small signal and a large signal, and the feed time may be several hundred microseconds to several milliseconds.

Specifically, the process of transmitting the calibration signal through the calibration channel by the calibration unit of the RF channel calibration device can be as shown in FIG. 8. The calibration unit can obtain a calibration signal from a processing unit (eg, a BBU) through a baseband cpri interface and process it to obtain an intermediate frequency (IF) digital signal. After processing, it is converted into an analog signal by a digital to analog converter (DAC), which is then transmitted to the coupling network by the transmitting circuit TX, which is divided into N signals by the coupling network and transmitted to the radio frequency unit.

Step 402: Receive the N signals through N receiving channels respectively.

Specifically, the process of the radio frequency unit of the radio frequency channel calibration device receiving the N signals output by the coupling network through the N receiving channels respectively can be as shown in FIG. 8. The RF unit (for example, RRU) receives the calibration signal through the duplexer DUP and the receiving circuit RX, and converts the received signal into a digital signal by the analog-to-digital converter ADC, and then performs digital sampling processing through the IF to obtain final reception. signal of.

Step 403: Determine a receiving phase difference of the N receiving channels, and calibrate the corresponding receiving channel based on the received phase differences of the N receiving channels.

After the RF channel calibration device receives the calibration signal sent by the calibration channel through the N receiving channels, the RF channel calibration device can determine the receiving phase difference of the N receiving channels according to the transmitted calibration signal and the signals received by the N receiving channels. . Thereafter, the corresponding receiving channel can be calibrated according to the received phase difference of the N receiving channels.

Specifically, the process of determining the received phase difference of the N receiving channels by the RF channel calibration device may be performed by the calibration unit, or may be performed by an independent processing unit of the RF channel calibration device, when the receiving unit determines the reception of the N receiving channels. When the phase is different, the calibration unit can send it to the processing unit after the determination. Finally, the processing unit calibrates the corresponding receiving channel based on the received phase differences of the N receiving channels. For example, as shown in FIG. 8, the processing unit may be a BBU, and the BBU calibrates the corresponding receiving channel based on the received phase difference of the N receiving channels.

Further, before the RF channel calibration device performs the RF channel calibration, the RF channel calibration device may further configure the frequency point information of the calibration channel according to the carrier frequency information of the receiving channel, so as to improve the receiving power of receiving the calibration signal through the receiving channel, and further Improve loop accuracy for RF channel calibration.

The radio frequency channel calibration method provided by the embodiment of the present invention, the radio frequency channel calibration device passes the calibration signal sent by the calibration channel, and divides the calibration signal into N signals, respectively receives the N signals through the N receiving channels, and determines N Receive phase difference of the receiving channel, and calibrate the corresponding receiving channel based on the receiving phase difference of the N receiving channels, so that when the RF channel calibration is performed through the provided calibration channel, not only the phase difference introduced by the RF unit itself can be calibrated, but also The phase difference introduced by the feeder is calibrated to improve the loop accuracy of the RF unit receive channel calibration.

An embodiment of the present invention provides a device. The structure of the device is shown in FIG. 2. The device includes a radio frequency unit 101, a calibration unit 102, and a processing unit 103. The radio unit 101 and the calibration unit 102 are respectively connected to the processing unit 103, and are calibrated. Unit 102 includes a coupling network 1021 that is coupled to coupling network 1021 via a feeder. The radio frequency unit 101, the calibration unit 102, and the processing unit 103 are configured to support the device to perform the radio frequency channel calibration method shown in FIG. 5 and/or FIG. 7 above.

The device provided by the embodiment of the present invention can perform radio frequency channel calibration through the calibration channel provided by the calibration unit when calibrating the radio frequency channel included in the device, so that not only the phase difference introduced by the radio frequency unit itself can be calibrated, but also The phase difference introduced by the feeder is calibrated to improve the loop accuracy of the RF channel calibration of the RF unit.

Finally, it should be noted that the above description is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be covered in the present application. Within the scope of protection of the application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A radio frequency channel calibration apparatus, characterized in that the apparatus comprises a radio frequency unit, a calibration unit and a processing unit, the radio frequency unit and the calibration unit are respectively connected to the processing unit, the calibration unit comprises a coupling network, The radio frequency unit is connected to the coupling network through a feeder; wherein

The radio frequency unit includes M transmit channels, configured to send a calibration signal by using the M transmit channels, where M is a positive integer greater than or equal to 2;

The coupling network is configured to couple the calibration signals sent by the M transmitting channels into one signal;

The calibration unit further includes a calibration channel for receiving a signal output by the coupled network through the calibration channel;

The processing unit is configured to determine a transmit phase difference of the M transmit channels, and calibrate a corresponding transmit channel based on a transmit phase difference of the M transmit channels.
The apparatus of claim 1 wherein said calibration unit further comprises a calibration processing module for providing said calibration channel.
The apparatus of claim 2 wherein said calibration processing module comprises a baseband processor, a filter and a power amplifier.
A radio frequency channel calibration apparatus, characterized in that the apparatus comprises a radio frequency unit, a calibration unit and a processing unit, the radio frequency unit and the calibration unit are respectively connected to the processing unit, the calibration unit comprises a coupling network, The radio frequency unit is connected to the coupling network through a feeder; wherein

The calibration unit further includes a calibration channel for transmitting a calibration signal through the calibration channel;

The coupling network is configured to split the calibration signal into N signals, where N is a positive integer greater than or equal to 2;

The radio frequency unit includes N receiving channels, respectively, for receiving the N signals through the N receiving channels;

The processing unit is configured to determine a received phase difference of the N receiving channels, and calibrate a corresponding receiving channel based on a received phase difference of the N receiving channels.
The apparatus of claim 4 wherein said calibration unit further comprises a calibration processing module for providing said calibration channel.
The apparatus of claim 5 wherein said calibration processing module comprises a baseband processor, a filter and a power amplifier.
An RF channel calibration method is characterized in that it is applied to a radio frequency channel calibration apparatus, and the method includes:

Sending a calibration signal through M transmit channels;

Coupling the calibration signal sent by the M transmit channels into a signal and receiving the one signal through the calibration channel;

Determining a transmission phase difference of the M transmission channels, and calibrating a corresponding transmission channel based on a transmission phase difference of the M transmission channels.
The method according to claim 7, wherein before the receiving the one signal by the calibration channel, the method further comprises:

And configuring frequency point information of the calibration channel according to carrier frequency point information of the M transmitting channels.
An RF channel calibration method is characterized in that it is applied to a radio frequency channel calibration apparatus, and the method includes:

a calibration signal transmitted through the calibration channel and splitting the calibration signal into N signals;

Receiving the N signals respectively through N receiving channels, where N is a positive integer greater than or equal to 2;

Determining a received phase difference of the N receiving channels, and calibrating a corresponding receiving channel based on a received phase difference of the N receiving channels.
The method according to claim 9, wherein before the receiving the N signals by the N receiving channels, the method further comprises:

And configuring frequency point information of the calibration channel according to carrier frequency point information of the N receiving channels.
An apparatus, comprising: a radio frequency unit, a calibration unit, and a processor, wherein the radio frequency unit and the calibration unit are respectively connected to the processing unit, the calibration unit comprising a coupling network, the radio frequency unit Connected to the coupling network via a feeder, the radio unit, the calibration unit and the processor for supporting the apparatus to perform the radio frequency channel calibration method of claim 7 or 8 and/or for supporting The apparatus performs the radio frequency channel calibration method of claim 9 or 10.