WO2020107361A1

WO2020107361A1 - Calibration method and apparatus for radio frequency channel

Info

Publication number: WO2020107361A1
Application number: PCT/CN2018/118367
Authority: WO
Inventors: 杨依; 丁金义; 李金兴
Original assignee: 华为技术有限公司
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2020-06-04
Also published as: CN112567653A; CN112567653B

Abstract

Provided are a calibration method and a calibration apparatus (20) for a radio frequency channel. The method comprises: the calibration apparatus (20) transmitting a calibration signal by means of a reference radio frequency channel, and the other radio frequency channels to be calibrated receiving actually measured signals by means of a reflecting plate (21); determining a correlation between transmission coefficients of the radio frequency channels to be calibrated and the reference radio frequency channel by comparing the actually measured signal and the calibration signal and a transmission coefficient of a reflection link; and performing relative calibration by taking the reference radio frequency channel as a reference according to the correlation. The calibration process can be implemented without the aid of an external instrument, the calibration apparatus automatically performs the relative calibration on the radio frequency channel, improving test efficiency and saving on test costs.

Description

Radio frequency channel calibration method and device

Technical field

The present application relates to the field of wireless communication, and in particular to a method and device for calibrating radio frequency channels.

Background technique

Multiple input multiple output (multiple input, multiple output, MIMO) technology means that both the transmitting device and the receiving device use multiple antennas. The MIMO technology can increase the bandwidth without increasing the spectrum resources and antenna transmit power.

Due to device aging or temperature changes, the amplitude and phase of the signal received by the antenna after passing through a radio frequency (RF) channel composed of multiple devices may be different. This error in amplitude and phase may cause The radio frequency signals transmitted by multiple radio frequency channels cannot form a direct beam, so there is a need for calibration of the radio frequency channels.

At present, when using RF channel calibration, an external feed is usually set, the external feed generates a calibration signal, and then transmits the calibration signal through each RF channel, receives the measurement signal sent out through each RF channel, and then uses The test instrument compares the amplitude difference and phase difference between the calibration signal and each measurement signal, and compensates each RF channel according to the amplitude difference and phase difference calibration.

In summary, the current RF channel calibration method requires the use of external feeds and test instruments to test the amplitude information and phase information of each RF channel. The measurement efficiency is low and the measurement cost is high, and it cannot meet the needs of batch measurement.

Summary of the invention

The technical problem to be solved by the present application is to provide a radio frequency channel calibration method and a calibration device, which can enable the radio frequency channel to be measured without the aid of external instruments, which is beneficial to improve the efficiency of the radio frequency channel calibration and reduce the cost of calibration.

In the first aspect, the present application provides a method for calibrating a radio frequency channel. The calibration method is applied to a calibration device. The calibration device includes n radio frequency channels to be calibrated and a reference radio frequency channel, and each radio frequency channel includes an antenna. A reflection plate is provided in front of the calibration device; the calibration method includes: the calibration device transmits the calibration signal through the reference radio frequency channel, and the reflection plate is used to reflect the signal emitted by the antenna of the reference radio frequency channel to each of the n radio frequency channels to be calibrated On the antenna; the calibration device receives the measured signal y _i through the i-th RF channel to be calibrated, 1≤i≤n, and i is an integer; the calibration device determines the transmission coefficient of the i-th RF channel to be calibrated, the i-th to be calibrated The transmission coefficient of the RF channel is related to one or more of the measured value of the calibration signal, the measured value of the measured signal y _i , the transmission coefficient of the i-th reflection link and the transmission coefficient of the reference RF channel; the i-th reflection chain Road represents the wireless link between the antenna of the reference RF channel and the antenna of the i-th RF channel to be calibrated. The calibration device calibrates the transmission coefficient of the i-th radio frequency channel based on the transmission coefficient of the reference radio frequency channel.

The radio frequency channel is a hardware channel between the baseband chip and the antenna. The calibration signal generated by the baseband chip is sequentially referenced to the radio frequency channel, the reflection link, and the radio frequency channel to be calibrated, and then received by the baseband chip again. The transmission coefficient includes amplitude gain and/or phase offset. The measured value of the calibration signal and the measured value of the measured signal include one or more of the amplitude and phase of the signal.

The calibration device transmits the calibration signal through the reference radio frequency channel, and other radio frequency channels to be calibrated receive the measured signal through the reflection plate, and the transmission coefficient of the radio frequency channel to be calibrated and the reference radio frequency channel are determined by comparing the measured signal and the calibration signal and the transmission coefficient of the reflective link Correspondence between the two, according to the corresponding relationship to achieve relative calibration using the reference RF channel as a reference, the calibration process can be achieved without the aid of external instruments, the calibration device automatically performs relative calibration of the RF channel, which improves test efficiency and saves test costs .

In a possible design, the transmission coefficient of the i-th reflective link is related to the path length and the reflection coefficient of the reflector. The material of the reflector is metal, and the reflection coefficient of the reflector is related to the material. The reflection plate reflects the signal by means of total reflection.

In a possible design, the transmission coefficient of the i-th reflective link is obtained according to the following formula:

Where h _i represents the transmission coefficient of the i-th reflective link, α represents the reflection coefficient of the reflector, d _i represents the path length of the i-th reflective link, j represents the imaginary unit, and e represents the natural constant, π represents the pi.

In a possible design, the path length of the i-th reflection link and the distance between the calibration device and the reflector, and between the antenna of the reference RF channel and the antenna of the i-th RF channel to be calibrated Distance.

In a possible design, the path length of the i-th reflective link and the distance between the antenna of the i-th radio frequency channel to be calibrated and the reflector, and the antenna of the reference radio frequency channel and the i-th radio frequency to be calibrated The distance between the antennas of the channel is related.

In a possible design, before transmitting the calibration signal through the reference radio frequency channel, the method further includes:

Configuring the reflection coefficient of the reflecting plate, the distance between the antenna of the reference RF channel and the antenna of the i-th RF channel to be calibrated, and the antenna of the i-th RF channel to be calibrated and the reflecting plate the distance between.

In a possible design, the distance between two adjacent antennas in the n+1 antennas is equal.

In a possible design, n+1 antennas form an antenna array, and the antenna array is a low-profile antenna.

In a second aspect, the present application provides a method for calibrating a radio frequency channel, which is applied to a calibration device. The calibration device includes a reference radio frequency channel and n radio frequency channels to be calibrated, and each radio frequency channel includes an antenna; The calibration method includes: transmitting the calibration signal through n radio channels to be calibrated at different times; receiving the measured signal y _i through the reference radio frequency channel, the measured signal y _i is the calibration signal passing through the ith radio frequency channel to be calibrated, the i Obtained after the reflection link and the reference RF channel, the i-th reflection link indicates that the signal emitted by the antenna of the i-th RF channel to be calibrated reaches the reference RF channel after being reflected by the reflector The signal path experienced on the antenna of the antenna; the calibration device determines the transmission coefficient of the i-th RF channel to be calibrated, wherein the transmission coefficient of the i-th RF channel to be calibrated and the measured value of the calibration signal and the measured value of the measured signal y _i The transmission coefficient of the i-th reflective link is related to one or more of the transmission coefficients of the reference radio frequency channel; the calibration device calibrates the transmission coefficients of the n radio frequency channels based on the transmission coefficient of the reference radio frequency channel.

The measured value of the calibration signal and the measured value of the measured signal include amplitude and/or phase, and the transmission coefficient includes amplitude gain and/or phase offset.

The calibration device transmits the calibration signal through the RF channel to be calibrated in a time-division manner. The reference device channel receives the measured signal through the reflection plate at different times in turn. Correspondence between the transmission coefficients of the reference RF channel, according to the corresponding relationship to achieve relative calibration using the reference RF channel as a reference, the test process can be achieved without the aid of external instruments, the calibration device automatically realizes the relative calibration of the RF channel, which improves Test efficiency and save test cost.

In a possible design, the transmission coefficient of the i-th reflective link is related to the path length and the reflection coefficient of the reflector.

In a possible design, the path length of the i-th reflective link and the distance between the antenna of the i-th RF channel to be calibrated and the reflector, and the antenna of the reference RF channel and the i-th RF channel to be calibrated The distance between the antennas is related.

In a possible design, the distance between two adjacent antennas in the n+1 antennas is equal, that is, the n+1 antennas are distributed at equal intervals.

In a third aspect, the present application provides a method for calibrating radio frequency channels. The method is applied to a calibration device. The calibration device includes a reference radio frequency channel and n radio frequency channels to be calibrated, and each radio frequency channel includes an antenna; The calibration method includes: the calibration device transmits the calibration signal through the reference radio frequency channel; the calibration device receives the measured signal y _i through the i-th radio frequency channel to be calibrated, the measured signal y _i is the calibration signal passing through the reference radio frequency channel, free space The link and the ith radio frequency channel to be calibrated are obtained; the calibration device determines the transmission coefficient of the ith radio frequency channel to be calibrated; the free space link is the signal transmitted by the antenna of the reference radio frequency channel to the antenna of the radio frequency channel to be calibrated The signal path experienced in the above, wherein the transmission coefficient of the i-th radio frequency channel to be calibrated is related to the measured value of the calibration signal, the measured value of the measured signal y _i and the transmission coefficient of the reference radio frequency channel; the calibration device The transmission coefficients of the n radio frequency channels to be calibrated are calibrated based on the transmission coefficient of the reference radio frequency channel.

The radio frequency channel represents the hardware channel from the baseband chip to the antenna. The calibration signal generated by the baseband chip is sequentially received by the baseband chip through the reference radio frequency channel, the free space link, and the radio frequency channel to be calibrated. The transmission coefficient includes the signal amplitude gain and/or phase offset, and the measured value of the calibration signal and the measured value of the measured signal include amplitude and/or phase.

According to the above description, the calibration device transmits the calibration signal through the reference radio frequency channel, and other radio frequency channels to be calibrated receive the measured signal through free space. The radio frequency channel to be calibrated and the reference radio frequency are determined by comparing the measured signal with the calibration signal and the transmission coefficient of the reflective link Correspondence between the transmission coefficients of the channels, according to the corresponding relationship to achieve relative calibration using the reference RF channel as a reference, the test process can be achieved without the aid of external instruments, the calibration device automatically realizes the relative calibration of the RF channel, which improves the test efficiency And save the test cost.

In a possible design, n+1 antennas are on the same plane, n+1 antennas form an antenna array, and the antenna array is a low-profile antenna.

In a possible design, the antennas of the n radio frequency channels to be calibrated form a rectangle, and the antenna of the reference radio frequency channel is located in the center of the rectangle.

In a fourth aspect, the present application provides a method for calibrating a radio frequency channel. The calibration method is applied to a calibration device. The calibration device includes a reference radio frequency channel and n radio frequency channels to be calibrated, and each radio frequency channel includes an antenna. The calibration method includes: the calibration device transmits the calibration signal through n radio channels to be calibrated at different times; the calibration device receives the measured signal y _i through the reference device channel, and the measured signal is the calibration signal passing through the i Obtained after calibrating the radio frequency channel, the free space link and the reference radio frequency channel, the calibration device determines the transmission coefficient of the i-th radio frequency channel to be calibrated, the transmission coefficient of the i-th radio frequency channel to be calibrated and the measured value of the calibration signal, measured The measured value of the signal y _i is related to the transmission coefficient of the reference radio frequency channel; the calibration device calibrates the transmission coefficients of the n radio frequency channels to be calibrated based on the transmission coefficient of the reference radio frequency channel.

According to the above description, the calibration device sequentially emits calibration signals through the RF channel to be calibrated, the reference RF channel receives the measured signal through free space at different times, and determines the transmission coefficient between the RF channel to be calibrated and the reference RF channel by comparing the measured signal and the calibration signal According to the corresponding relationship, the relative calibration using the reference RF channel as the reference is achieved. The test process can be achieved without the help of an external instrument. The calibration device automatically realizes the relative calibration of the RF channel, which improves test efficiency and saves test costs. .

In a possible design, n+1 antennas are coplanar, and n+1 antennas form an antenna array, and the antenna array is a low-profile antenna.

In a possible design, the antennas of the n radio frequency channels to be calibrated are arranged in a rectangle, and the antennas of the reference radio frequency channel are located in the center of the rectangle.

On the other hand, an embodiment of the present invention provides a device that is used for the function of calibrating device behavior in the above method. The function can be realized by hardware, or can also be realized by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the structure of the calibration device includes a processor and a transmitter, and the processor is configured to support the calibration device to perform the corresponding function in the above method. The transmitter is used to support communication between the calibration apparatus and other devices, and send information or instructions involved in the above method to other devices. The calibration device may further include a memory for coupling with the processor, which stores necessary program instructions and data.

In yet another aspect, the present application provides a computer storage medium, including instructions that when run on a computer, cause the computer to perform the method described in any one of the various possible implementation manners of the first aspect to the fourth aspect.

Yet another aspect of the present application provides a computer program product containing instructions, which when run on a computer, causes the computer to perform the method described in any one of the various possible implementation manners of the first aspect to the fourth aspect.

BRIEF DESCRIPTION

1 is a schematic structural diagram of a radio frequency channel provided by an embodiment of the present invention;

2A is a schematic structural diagram of a test system provided by an embodiment of the present invention

2B is another schematic structural diagram of a test system provided by an embodiment of the present invention;

2C is a schematic flowchart of a radio frequency channel calibration method provided by an embodiment of the present invention;

3A is another schematic structural diagram of a test system provided by an embodiment of the present invention;

FIG. 3B is another schematic flowchart of a method for calibrating a radio frequency channel provided by an embodiment of the present invention;

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

4B is a schematic diagram of the antenna distribution in the calibration device provided by the embodiment of the present invention;

4C is another schematic flowchart of a method for calibrating a radio frequency channel provided by an embodiment of the present invention;

5A is a schematic structural diagram of a calibration device according to an embodiment of the present invention;

5B is another schematic flowchart of a method for calibrating a radio frequency channel provided by an embodiment of the present invention;

6 is a schematic structural diagram of a calibration device provided by an embodiment of the present invention;

7 is another schematic structural diagram of a calibration device according to an embodiment of the present invention.

detailed description

The following describes the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

Before introducing the present invention, the technical terminology involved in this application is first introduced.

The radio frequency channel is a hardware channel that transmits and receives signals between the antenna and the baseband chip. The radio frequency channel may include an antenna, a filter, a low noise amplifier (LNA), analogue or digital analogue (analogue to digital/digital) analogue , A/D or D/A) converter and other components. The calibration device of the present application is provided with n+1 radio frequency channels. Among the n+1 radio frequency channels, there is one reference radio frequency channel and n radio frequency channels to be calibrated. The reference radio frequency channel is any one of n+1 radio frequency channels. The reference radio frequency channel may be pre-designated by the calibration device. The reference RF channel is used as a reference for other n RF channels to be calibrated for relative calibration.

For example, referring to FIG. 1, the calibration device includes a baseband chip and 4 radio frequency channels. The baseband chip includes 4 ports, and each port corresponds to one radio frequency channel. RF channels include antennas, filters, LNA and D/A. Among the four radio frequency channels, radio frequency channel 1 is a reference radio frequency channel, and radio frequency channel 2 to radio frequency channel 4 are radio frequency channels to be calibrated.

The calibration signal is a known signal, for example, the baseband chip generates the calibration signal according to the pre-stored or pre-configured amplitude and phase.

The measured signal represents the signal received by the calibration device through the channel to be calibrated, and the amplitude and phase of the signal can also be measured.

Reflective link means that the signal is sent from the antenna of the RF channel to be calibrated, reflected by the reflector, and then to the signal path between the antennas of the reference RF channel; or the signal is sent from the antenna of the reference RF channel, reflected by the reflector, and then to The signal path between the antennas of the RF channel to be calibrated.

Wherein, the calibration device of the present application may be a terminal device or a network device.

Terminal equipment is a device with wireless communication function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on the water (such as ships, etc.); it can also be deployed in the air (such as aircraft , Balloons and satellites etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device, industrial control ( wireless terminal in industrial control), wireless terminal in self-driving (self-driving), wireless terminal in remote medical (remote medical), wireless terminal in smart grid (smart grid), transportation safety (transportation safety) Wireless terminals, wireless terminals in smart cities, wireless terminals in smart homes, etc. The terminal device may also be a handheld device with a wireless communication function, a vehicle-mounted device, a wearable device, a computing device, or other processing devices connected to a wireless modem. Terminal devices can be called different names in different networks, for example: terminal device, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication Equipment, user agents or user devices, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital processing (personal digital assistant (PDA), Terminal equipment in 5G networks or future evolution networks, etc.

A network device can also be called a base station or a base station device. It is a device deployed in a wireless access network to provide wireless communication functions, including but not limited to: a base station (for example: BTS (Base Transceiver Station, BTS), Node B ( NodeB, NB), Evolutionary Node B (Evolutional Node B, eNB or eNodeB), transmission node or transmission point (TRP or TP) in NR system or next generation Node B (generation NodeB, gNB), future Base stations or network equipment in communication networks), relay stations, access points, in-vehicle equipment, wearable devices, wireless fidelity (Wireless-Fidelity, Wi-Fi) stations, wireless backhaul nodes, small stations, micro stations, etc. . For the convenience of description, in all the embodiments of the present application, the above apparatuses that provide the wireless communication function for the UE are collectively referred to as network equipment.

Referring to FIG. 2A, it is a schematic structural diagram of a test system provided by an embodiment of the present invention. The test system includes a calibration device 20 and a reflective plate 21, and the reflective plate is located in front of the calibration device 20. The calibration device 20 is provided with n+1 antennas, n is an integer greater than 0, n+1 antennas are antenna ant ₀ , antenna ant ₁ , ..., antenna ant _n , and n+1 antennas correspond to radio frequency channels 0, Radio frequency channel 1, ..., radio frequency channel n. In an embodiment of the present invention, the reference radio channel to any of n + 1 radio channels a, for example, the antenna Ant ₀ corresponding to the radio frequency channel 0 as the reference radio channel, the other of n radio channels as to be calibrated radio frequency channel, the reference The designation of the radio frequency channel can be performed before the calibration operation. Each radio frequency channel has one transmission coefficient, and the transmission coefficient includes amplitude gain and/or phase offset, that is, the amplitude change and phase change that occur after the signal passes through the radio frequency channel.

For example, n=4, the calibration device is provided with 5 antennas, the 5 antennas are antenna ant ₀ , antenna ant ₁ , antenna ant ₂ , antenna ant ₃ and antenna ant ₄ respectively, and the 5 antennas respectively correspond to radio frequency channel 0 , RF channel 1, RF channel 2, RF channel 3 and RF channel 4.

Further, referring to FIG. 2B, the test system further includes a first baffle 22, a second baffle 23, and a third baffle 24. The first baffle 22 is connected to the reflective plate 21 and the second baffle 23, respectively. The three baffles 24 are respectively connected to the second baffle 23 and the reflective plate 21. The first baffle 22, the second baffle 23, the third baffle 24 and the reflection plate form a closed cavity, and the calibration device 20 is located in the cavity. The inner surfaces of the first baffle 22, the second baffle 23, and the third baffle 24 are covered with a layer of absorbing material 25. The absorbing material 25 is used to absorb electromagnetic waves. When the signal emitted by the calibration device 20 meets the first baffle 22. The inner surfaces of the second baffle 23 and the third baffle 24 will not reflect, and will only reflect when they meet the reflecting plate 21, to avoid interference with the calibration results. In a possible implementation, the first baffle 22 is perpendicular to the reflection plate 21 and the second baffle 23, the third baffle 24 is perpendicular to the reflection plate 21 and the second baffle 23, and the first baffle 22, the second The baffle 23, the third baffle 24 and the metal constitute a rectangular cavity.

Based on the test system of FIG. 2A or 2B, referring to FIG. 2C, it is a schematic flowchart of a method for calibrating a radio frequency channel according to an embodiment of the present invention. In the embodiment of the present invention, the method includes:

S201. Transmit the calibration signal through the reference radio frequency channel.

Specifically, the calibration device transmits the calibration signal through the reference radio frequency channel. In a possible implementation, the calibration signal may be generated by the baseband chip, and the signals transmitted from the reference radio frequency channel pass through different reflection links to reach n. On the antenna of the radio frequency channel to be calibrated, each radio frequency channel to be calibrated corresponds to one reflection path, that is, there are n reflection paths in total, and each reflection link has a transmission coefficient. The reflective link is the signal path between the radio frequency channels to be calibrated by the antenna of the reference radio frequency channel through the reflective plate. As shown in FIG. 2A, the signal paths with n dotted lines are n reflective links. In one possible implementation, the calibration signal is a sine signal or a cosine signal.

For example, n=4, the calibration signal is s, and the transmission coefficient of the reference RF channel is a ₀ (unknown quantity), then the signal transmitted by the antenna of the reference RF channel is a ₀ ×s, and the signal a ₀ ×s passes 4 A different reflection link reaches antenna ant ₁ , antenna ant ₂ , antenna ant ₃ and antenna ant ₄ respectively.

S202. Receive the measured signal y _i through the i-th radio frequency channel to be calibrated.

Specifically, the measured signal y _i is obtained after the calibration signal passes through the reference RF channel, the i-th reflection link, and the i-th RF channel to be calibrated. The i-th reflection link is a signal sent from the antenna of the reference RF channel. The path that the reflector reflects on the antenna of the i-th radio frequency channel to be calibrated, i is the serial number, i is an integer, and 1≤i≤n.

For example, the calibration signal is s, the transmission coefficient of the reference radio channel for a ₀ (unknown), the transmission coefficient of the n radio frequency channel to be calibrated are _{_{a 1, a 2, ... a}} n ( unknown), the n The transmission coefficients of the respective reflection links of the radio frequency channel to be calibrated are h ₁ , h ₂ , ... h _n (known quantity). For the i-th radio frequency channel to be calibrated, the measured signal received by the calibration device through the i-th radio frequency channel to be calibrated is: y _i = h _i ×a _i ×a ₀ ×s+n, n is a noise signal, and is ignored In the case of noise, y _i =h _i ×a _i ×a ₀ ×s.

S203. Determine the transmission coefficient of the i-th radio frequency channel to be calibrated.

Specifically, the transmission coefficient of the i-th radio frequency channel to be calibrated is related to the transmission coefficient of the i-th reflective link, the measured value of the measured signal y _i , the transmission coefficient of the reference radio frequency channel, and the measured value of the calibration signal. The measured value includes the signal One or more of the amplitude, phase and frequency. In a possible implementation, the calibration device generates a data mapping table after receiving the measured signal y _i , and stores the data mapping table. The data mapping table represents the measured value of the calibration signal, the measured value of the measured signal and the reflection link. For the mapping relationship between the transmission coefficients, the calibration device can obtain the relationship between the transmission coefficient of the radio frequency channel to be calibrated and the transmission coefficient of the reference radio frequency channel according to the data mapping table.

For example, according to the example in S202, the transmission coefficient of the i-th RF channel to be calibrated is

Since y _{_i,} h _i and s is a known quantity, it is possible to obtain the relationship between the transmission coefficient of the i-th radio frequency channel to be calibrated and the reference radio channel transmission coefficient according to the above formula. The relationship between the transmission coefficients a ₁ , a ₂ ,... An of the _n radio frequency channels to be calibrated and the transmission coefficient a _{0 of the} reference radio frequency channel is calculated according to the methods of S202 and S203.

For another example, n=3, the measured values of the measured signal and the calibration signal are amplitude, phase, and frequency. The data mapping table is shown in Table 1:

Table 1

In a possible implementation manner, the transmission coefficient of the i-th radio frequency channel to be calibrated is related to the path length and the reflection coefficient of the reflective plate, and the path length is the signal from the antenna of the reference calibration channel to the i-th radio frequency to be calibrated through the reflective plate The length between the antennas of the channel, the reflection plate is made of metal, and the reflection coefficient of the reflection plate is related to the material of the reflection plate. The reflection coefficient can be pre-stored or pre-configured in the calibration device before the calibration operation.

For example, the first reflection link is the path that the signal is sent by the antenna of the reference radio frequency channel, and after being reflected by the reflection plate to reach the antenna of the first radio frequency channel to be calibrated, the length of the path is recorded in FIG. 2A as d ₁ . The second reflection link is the path that the signal is sent by the antenna of the reference radio frequency channel and reflected by the reflector to the antenna of the second radio frequency channel to be calibrated. The length of this path is marked as d ₁ in FIG. 2A. By analogy, the i-th reflection path is the path that the signal is sent by the antenna of the reference RF channel and reflected by the reflector to the antenna of the i-th RF channel to be calibrated. The length of this path is marked as d _i in FIG. 2A .

In a possible implementation manner, the transmission coefficient of the i-th reflective link is obtained according to the following formula:

In a possible implementation manner, the multiple antennas of the calibration device are distributed at equal intervals, and the distance between two adjacent antennas is equal, which is convenient for calculating the path length of each reflective link. For example: the distance between two adjacent antennas is k, and the distance between the antenna array and the reflector is D, then according to the principle of total reflection,

In a possible implementation manner, n+1 antennas form an antenna array, and the antenna array is a low-profile antenna. The antenna array may be flat on the reflective plate or perpendicular to the reflective plate.

S204. Calibrate the transmission coefficients of the n radio frequency channels to be calibrated based on the transmission coefficient of the reference radio frequency channel.

Specifically, the calibration requirement specifies the amplitude and/or phase relationship between the n+1 RF channels, and the relationship between the amplitude gain and/or phase offset between the n+1 RF channels is determined according to the calibration requirement. The transmission coefficient of the channel is used as a reference to calibrate the transmission coefficients of n RF channels to be calibrated.

For example, the calibration requirement is that the amplitude gains of n+1 RF channels are the same, then the gains of n RF channels to be calibrated are multiplied by the corresponding amplitude correction coefficients, so that the amplitude gains of the n RF channels to be calibrated and the reference RF channel The amplitude gain is the same.

For another example, the calibration requirement is that the phase offsets of the n+1 RF channels to be calibrated are the same, then the phases of the n RF channels to be calibrated are multiplied by the corresponding phase correction coefficients to meet the calibration requirements.

For another example, the calibration requirement is that the amplitude gain of n+1 RF channels to be calibrated is increased by equal steps, and the phase offset is increased by equal steps, then multiply the gain of n RF channels to be calibrated by the corresponding amplitude The correction factor and the corresponding phase correction factor are multiplied to meet the calibration requirements.

In the embodiment of the present invention, the calibration device transmits the calibration signal through the reference radio frequency channel, and other radio frequency channels to be calibrated receive the measured signals through the reflection plate, and the radio frequency channels to be calibrated are determined by comparing the measured signals with the calibration signals and the transmission coefficient of the reflection link. Correspondence between the transmission coefficients of the reference radio frequency channel, and relative calibration is performed with the reference radio frequency channel as the reference according to the correspondence. The calibration process can be achieved without the aid of external instruments. The calibration device automatically performs relative calibration on the radio frequency channel, which improves the test. Efficiency and saving test cost.

3A, which is a schematic structural diagram of a test system provided by an embodiment of the present invention. The structure of the test system in the embodiment of the present invention is completely the same as the structure of the test system in FIG. 2A. The structure of the test system in FIG. 3A may be With reference to the description in FIG. 2A, no further description is provided here.

Based on the test system of FIG. 3A, referring to FIG. 3B, it is a schematic flowchart of a calibration method provided by an embodiment of the present invention. The calibration method includes:

S301. The calibration device transmits the calibration signal through n radio channels to be calibrated at different times.

Specifically, the calibration device transmits the same calibration signal through n radio channels to be calibrated at different times. In a possible implementation, the calibration device sequentially sends the calibration signal through the n radio channels to be calibrated at equal time intervals. For any one of the n RF channels to be calibrated, the calibration signal goes through the RF channel to be calibrated, the reflection link, and the reference RF channel. The reflection link represents the path that the signal emitted by the antenna of the radio frequency channel to be calibrated reaches the antenna of the reference radio frequency channel after being reflected by the reflection plate. In one possible implementation, the calibration signal is a sine signal or a cosine signal.

For example, n=4, the calibration device includes a reference radio frequency channel and the radio frequency channel 1 to be calibrated to the radio frequency channel 4 to be calibrated, the calibration device sends a calibration signal s through the radio frequency channel 1 to be calibrated at time t1, and then passes the to be calibrated at time t2 The radio frequency channel 2 sends the calibration signal s, then sends the calibration signal s through the radio frequency channel to be calibrated at time t3, and finally sends the calibration signal s through the radio frequency channel to be calibrated at time t4.

S302. Receive the measured signal y _i through the reference radio frequency channel.

Specifically, the measured signal is obtained after the calibration signal passes through the ith radio frequency channel to be calibrated, the ith reflective link, and the reference radio frequency channel. The ith reflective link indicates that the signal is sent through the antenna of the ith radio frequency channel to be calibrated The path experienced by the antenna that reaches the reference radio frequency channel after being reflected by the reflection plate, i is the serial number is an integer, and 1≤i≤n.

For example, the transmission coefficient of the reference RF channel is a ₀ (unknown quantity), the transmission coefficients of the n RF channels to be calibrated are a ₁ , a ₂ , ... an _n (unknown quantity), and the n RF channels to be calibrated are each The transmission coefficients of the corresponding reflection links are h ₁ , h ₂ , ... h _n (known quantities). For the i-th radio frequency channel to be calibrated, 1≤i≤n, i is an integer, and the measured signal received by the calibration device through the reference radio frequency channel is: y _i =h _i ×a _i ×a ₀ ×s+n, n is a noise signal, ignoring _{_{noise, y i = h i × a}} i × a 0 × s.

S303. Determine the transmission coefficient of the i-th radio frequency channel to be calibrated.

Specifically, the transmission coefficient of the i-th radio frequency channel to be calibrated is related to the transmission coefficient of the i-th reflective link, the measured value of the measured signal y _i , the transmission coefficient of the reference radio frequency channel, and the measured value of the calibration signal. The measured value includes the signal One or more of the amplitude, phase and frequency. In a possible implementation, the calibration device generates a data mapping table after receiving the measured signal y _i , and stores the data mapping table. The data mapping table represents the measured value of the calibration signal, the measured value of the measured signal and the reflection link. For the mapping relationship between the transmission coefficients, the calibration device can obtain the relationship between the transmission coefficient of the radio frequency channel to be calibrated and the transmission coefficient of the reference radio frequency channel according to the data mapping table. For example: the data mapping table can be seen in Table 1.

For example, according to the example in S302, the transmission coefficient of the i-th RF channel to be calibrated is

Since y _{_i,} h _i and s is a known quantity, it is possible to obtain the relationship between the transmission coefficient of the i-th radio frequency channel to be calibrated and the reference radio channel transmission coefficient according to the above formula. The relationship between the transmission coefficients a ₁ , a ₂ ,... An of the _n radio frequency channels to be calibrated and the transmission coefficient a _{0 of the} reference radio frequency channel is calculated according to the methods of S302 and S303.

For example, the first reflection link is the path that the signal is sent by the antenna of the first RF channel to be calibrated, and then reflected by the reflector to reach the antenna of the reference RF channel. The length of this path is shown in Figure 3A as d ₁ . The second reflection link is the path that the signal is sent by the antenna of the third radio frequency channel to be calibrated, and then reflects to the antenna of the reference radio frequency channel after being reflected by the reflection plate. The length of this path is marked as d ₁ in FIG. 3A. By analogy, the i-th reflection path is the path that the signal is sent by the antenna of the i-th RF channel to be calibrated, and then reflects to the antenna of the reference RF channel after being reflected by the reflector. The length of this path is marked as d _i in FIG. 3A .

In a possible implementation manner, the multiple antennas included in the calibration device form an antenna array, and the antenna array is a low-profile antenna. The multiple antennas of the calibration device are distributed at equal intervals, and the distance between two adjacent antennas is equal. This is convenient for calculating the path length of each reflective link. For example: referring to FIG. 3A, the distance between two adjacent antennas is k, and the distance between the antenna array and the reflector is D. According to the principle of total reflection,

S304. Calibrate the transmission coefficients of the n radio frequency channels based on the transmission coefficient of the reference radio frequency channel.

For example, the calibration requirement is that the amplitude gains of the n+1 RF channels are the same, then the gains of the n RF channels to be calibrated are multiplied by the corresponding amplitude correction coefficients, so that the amplitude gains of the n RF channels to be calibrated and the reference RF channel The amplitude gain is the same.

In the embodiment of the present invention, the calibration device transmits the calibration signal through the radio frequency channel to be calibrated in a time-division manner, the reference device channel sequentially receives the measured signal through the reflection plate at different times, by comparing the measured signal and the calibration signal, and the transmission of the reflective link The coefficient determines the correspondence between the transmission coefficients of the RF channel to be calibrated and the reference RF channel. According to the corresponding relationship, the relative calibration with the reference RF channel as the reference is achieved. The test process can be achieved without the help of external instruments. The calibration device automatically implements RF The relative calibration of the channels improves test efficiency and saves test costs.

4A, which is a schematic structural diagram of a calibration device provided by an embodiment of the present invention. The calibration device is provided with n+1 antennas, the calibration device is provided with n+1 antennas, n is an integer greater than 0, and n+1 The antennas are respectively antenna ant ₀ , antenna ant ₁ , ..., antenna ant _n , and n+1 antennas respectively correspond to radio frequency channel 0, radio frequency channel 1, ..., radio frequency channel n. In an embodiment of the present invention, the reference radio channel to any of n + 1 radio channels a, for example, the antenna Ant ₀ corresponding to the radio frequency channel 0 as the reference radio channel, the other of n radio channels as to be calibrated radio frequency channel, the reference The designation of the radio frequency channel can be performed before the calibration operation. Each radio frequency channel has one transmission coefficient, and the transmission coefficient includes amplitude gain and/or phase offset, that is, the amplitude change amount and phase change amount that occur after the signal passes through the radio frequency channel.

In a possible implementation, the distance between two adjacent antennas in the n+1 antennas is equal, and the n+1 antennas are arranged horizontally or vertically.

In a possible implementation, n+1 antennas form an antenna array, and the antenna array is a low-profile antenna.

In a possible implementation, the n antennas corresponding to the n radio frequency channels to be calibrated are arranged in a rectangle, and one antenna corresponding to the reference radio frequency channel is located in the center of the rectangle.

For example, referring to FIG. 4B, the calibration device is provided with five antennas: antenna 1, antenna 2, antenna 3, antenna 4 and antenna 4, antenna 1 to antenna 4 form an antenna array, and the antenna array is a low-profile antenna. Antenna 1 to antenna 4 correspond to four radio frequency channels to be calibrated, antenna 5 corresponds to a reference radio frequency channel, antenna 1 to antenna 4 form a rectangle, and antenna 5 is located at the center of the rectangle.

Based on the calibration device of FIG. 4A, referring to FIG. 4C, it is a schematic flowchart of a method for calibrating a radio frequency channel according to an embodiment of the present invention. The method includes:

S401. Transmit the calibration signal through the reference radio frequency channel.

Specifically, the calibration device transmits the calibration signal through the reference radio frequency channel. In a possible implementation, the calibration signal may be generated by a baseband signal. The calibration signal passes through the reference radio frequency channel, free space, and the radio frequency channel to be calibrated again by the baseband chip receive. In one possible implementation, the calibration signal is a sine signal or a cosine signal.

For example, n=4, the calibration signal is s, and the transmission coefficient of the reference RF channel is a ₀ , then the signal emitted by the antenna of the reference RF channel is a ₀ ×s. The signal a ₀ ×s travels through free space to reach antenna ant ₁ , antenna ant ₂ , antenna ant ₃ and antenna ant _{4 respectively} .

S402. Receive the measured signal y _i through the i-th radio frequency channel to be calibrated.

Specifically, the measured signal y _i is obtained after the calibration signal passes through the reference radio frequency channel, the free space link, and the i-th radio frequency channel to be calibrated, i is a serial number, i is an integer, and 1≤i≤n.

For example, the calibration signal is s (known quantity), the transmission coefficient of the reference RF channel is a ₀ (unknown quantity), and the transmission coefficients of the n RF channels to be calibrated are a ₁ , a ₂ , ... a _n (unknown Quantity), the transmission coefficients of the free space links of the n radio frequency channels to be calibrated are k ₁ , k ₂ , ... k _{n, respectively} . For the i-th channel to be calibrated, 1≤i≤n, i is an integer, and the measured signal received by the calibration device through the i-th radio-frequency channel to be calibrated is: y _i = k _i ×a _i ×a ₀ ×s +n, n is a noisy signal. Because the distance between the antennas is small, the length of the free space link can be ignored, that is, the signal transmission in the free space link does not occur amplitude gain and phase shift, while neglecting In the case of noise, y _i = a _i ×a ₀ ×s.

S403. Determine the transmission coefficient of the i-th radio frequency channel to be calibrated.

Specifically, the transmission coefficient of the i-th radio frequency channel to be calibrated is related to the transmission coefficient of the i-th reflective link, the measured value of the measured signal _yi , the transmission coefficient of the reference radio frequency channel, and the measured value of the calibration signal. The measured value includes one or more of the signal's amplitude, phase, and frequency. In a possible implementation, the calibration device generates a data mapping table after receiving the measured signal y _i , and stores the data mapping table, the data mapping table represents the mapping relationship between the measured value of the calibration signal and the measured value of the measured signal The calibration device can obtain the relationship between the transmission coefficient of the radio frequency channel to be calibrated and the transmission coefficient of the reference radio frequency channel according to the data mapping table.

For example, according to the example in S402, the transmission coefficient of the i-th RF channel to be calibrated is

Since y _i and s are known quantities, the relationship between the transmission coefficient of the i-th radio frequency channel to be calibrated and the transmission coefficient of the reference radio frequency channel can be obtained according to the above formula. The relationship between the transmission coefficients of the n radio frequency channels to be calibrated and the reference radio frequency channel is calculated according to the methods of S402 and S403.

Table 2

S404. Calibrate the transmission coefficients of the n radio frequency channels to be calibrated based on the transmission coefficient of the reference radio frequency channel.

In the embodiment of the present invention, the calibration device transmits the calibration signal through the reference radio frequency channel, and other radio frequency channels to be calibrated receive the measured signal through free space, and the radio frequency channel to be calibrated is determined by comparing the measured signal with the calibration signal and the transmission coefficient of the reflection link. Correspondence between the transmission coefficients of the reference RF channel, according to the corresponding relationship to achieve relative calibration using the reference RF channel as a reference, the test process can be achieved without the aid of external instruments, the calibration device automatically realizes the relative calibration of the RF channel, which improves Test efficiency and save test cost.

Referring to FIG. 5A, it is a schematic structural diagram of a calibration device according to an embodiment of the present invention. The structure of the calibration device and the calibration device in FIG. 4A are completely the same, and the only difference is that the calibration method is different. The structure of the calibration device in FIG. 5A can refer to the description in FIG. 4A, and details are not repeated here.

Based on the calibration device of FIG. 5A, and referring to FIG. 5B, it is a schematic flowchart of a method for calibrating a radio frequency channel according to an embodiment of the present invention. The calibration method includes:

S501. Transmit the calibration signal through n radio channels to be calibrated at different times.

Specifically, the calibration device transmits the calibration signal through the n radio frequency channels to be calibrated at different times. In a possible implementation, the calibration device sequentially transmits the calibration signal through the n radio frequency channels to be calibrated at equal time intervals. For any one of the n RF channels to be calibrated, the calibration signal goes through the RF channel to be calibrated, the free space, and the reference RF channel. The free space link represents the path that the signal travels from the antenna of the radio frequency channel to be calibrated to the antenna of the reference radio frequency channel. In one possible implementation, the calibration signal is a sine signal or a cosine signal.

S502, the received signal y _i found by the reference radio frequency channel.

Specifically, the measured signal is obtained after the calibration signal passes through the i-th radio frequency channel to be calibrated, the free space link, and the reference radio frequency channel, i is a serial number as an integer, and 1≤i≤n.

For example, the transmission coefficient of the reference RF channel is a ₀ (unknown quantity), the transmission coefficients of the n RF channels to be calibrated are a ₁ , a ₂ , ... an _n (unknown quantity), and the n RF channels to be calibrated are each The transmission coefficients of the free space links are k ₁ , k ₂ , ... k _n . For the i-th radio frequency channel to be calibrated, 1≤i≤n, i is an integer, and the measured signal received by the calibration device through the calibration radio frequency channel is: y _i = k _i ×a _i ×a ₀ ×s+n, Because the distance between the antennas is small, the length of the free space link is negligible, that is, the amplitude gain and phase shift do not occur in the free space link transmission of the signal, and ignoring the noise, y _i = a _i ×a ₀ ×s.

S503. Determine the transmission coefficient of the i-th radio frequency channel to be calibrated.

Specifically, the transmission coefficient of the i-th radio frequency channel to be calibrated is related to the transmission coefficient of the i-th reflective link, the measured value of the measured signal y _i , the transmission coefficient of the reference radio frequency channel, and the measured value of the calibration signal. The measured value includes the signal One or more of the amplitude, phase and frequency. In a possible implementation, the calibration device generates a data mapping table after receiving the measured signal y _i , and stores the data mapping table. The data mapping table represents the measured value of the calibration signal, the measured value of the measured signal and the reflection link. For the mapping relationship between the transmission coefficients, the calibration device can obtain the relationship between the transmission coefficient of the radio frequency channel to be calibrated and the transmission coefficient of the reference radio frequency channel according to the data mapping table. For example: the data mapping table can be seen in Table 2.

For example, according to the example in S502, the transmission coefficient of the i-th RF channel to be calibrated is

Since y _i and s are known quantities, the relationship between the transmission coefficient of the i-th radio frequency channel to be calibrated and the transmission coefficient of the reference radio frequency channel can be obtained according to the above formula. According to the methods of S502 and S503, the relationship between the transmission coefficients of the n RF channels to be calibrated and the transmission coefficient of the reference RF channel is calculated.

S504. Calibrate the transmission coefficients of the n radio frequency channels to be calibrated based on the transmission coefficient of the reference radio frequency channel.

Specifically, according to the calibration requirements, the relationship between the pre-configured amplitude gain and/or phase offset of the n+1 reference RF channels is determined, and the transmission coefficients of the n RF channels to be calibrated are calibrated based on the transmission coefficient of the reference RF channel .

In the embodiment of the present invention, the calibration device sequentially transmits calibration signals through the radio frequency channel to be calibrated, the reference radio frequency channel receives the measured signal through free space at different times, and determines the transmission of the radio frequency channel to be calibrated and the reference radio frequency channel by comparing the measured signal and the calibration signal Correspondence between the coefficients, according to the corresponding relationship to achieve the relative calibration of the reference RF channel as a reference, the test process can be achieved without the aid of external instruments, the calibration device automatically realizes the relative calibration of the RF channel, which improves the test efficiency and saves Test costs.

The method of the embodiment of the present invention has been described in detail above. The following provides a schematic structural diagram of the device of the embodiment of the present invention. The calibration device 6 is hereinafter referred to as the calibration device 6, which includes a processing unit 601 and a transceiver unit 602. The device 6 is used to execute FIG. 2A ~ Behavioral function of the calibration device in the embodiment of FIG. 5B.

Example one:

The calibration device 6 is provided with n radio frequency channels to be calibrated and a reference radio frequency channel, and each radio frequency channel includes an antenna. An integer of 0;

The calibration device 6 includes:

The transceiver unit 602 is configured to transmit the calibration signal through the reference radio frequency channel.

The transceiver unit 602 is further configured to receive the measured signal y _i through the i-th radio frequency channel to be calibrated; wherein the measured signal y _i is the calibration signal passing through the reference radio frequency channel, the i-th reflection link and the Obtained after the i-th device channel to be calibrated, the i-th reflection link represents the path that the signal transmitted by the antenna of the reference radio frequency channel passes through the reflector to the antenna of the i-th radio frequency channel to be calibrated ; 1≤i≤n, and i is an integer;

The processing unit 601 is configured to determine the transmission coefficient of the i-th radio frequency channel to be calibrated; wherein, the transmission coefficient of the i-th radio frequency channel to be calibrated and the measured value of the calibration signal, the measured signal y _i The measured value, the transmission coefficient of the i-th reflective link is related to one or more of the transmission coefficients of the reference radio frequency channel;

The processing unit 601 is further configured to calibrate the transmission coefficients of the n radio frequency channels to be calibrated based on the transmission coefficient of the reference radio frequency channel.

In a possible implementation manner, the transmission coefficient of the ith reflection link is related to the path length and the reflection coefficient of the reflection plate.

In a possible implementation manner, the path length of the i-th reflective link and the distance between the antenna of the i-th radio frequency channel to be calibrated and the reflector, and the antenna of the reference radio frequency channel It is related to the distance between the antennas of the i-th radio frequency channel to be calibrated.

In a possible implementation manner, the distance between two adjacent antennas in the n+1 antennas corresponding to the n radio frequency channels to be calibrated and one reference radio frequency channel is equal.

In a possible implementation manner, n radio frequency channels to be calibrated and n+1 antennas corresponding to one reference radio frequency channel form an antenna array, the antenna array is a low-profile antenna, and the antenna array is perpendicular to the antenna array A reflective plate, or perpendicular to the reflective plate.

Example 2:

The calibration device 6 is provided with n radio frequency channels to be calibrated and a reference radio frequency channel, each radio frequency channel includes an antenna, a reflection plate is provided in front of the calibration device, the reflection plate is used for reflecting signals, n is greater than An integer of 0.

The calibration device 6 includes:

The transceiver unit 602 is configured to transmit the calibration signal through n radio channels to be calibrated at different times.

The transceiver unit 602 receives the measured signal y _i through the reference radio frequency channel. The measured signal y _i is obtained after the calibration signal passes through the i-th radio frequency channel to be calibrated, the i-th reflection link, and the reference radio frequency channel. The ith reflection link represents the wireless path that the signal processed from the antenna of the ith radio frequency channel to be calibrated reaches the antenna of the reference radio frequency channel after passing through the reflection plate.

The processing unit 601 is used to determine the transmission coefficient of the i-th radio frequency channel to be calibrated, wherein the transmission coefficient of the i-th radio frequency channel to be calibrated and the measured value of the calibration signal, the measured value of the measured signal y _i , the i-th reflection chain The transmission coefficient of the channel is related to one or more of the transmission coefficients of the reference radio frequency channel.

The processing unit 601 is configured to calibrate the device to calibrate the transmission coefficients of the n RF channels based on the transmission coefficient of the reference RF channel.

Example three:

The calibration device 6 is provided with a reference radio frequency channel and n radio frequency channels to be calibrated, and each radio frequency channel includes an antenna.

The calibration device 6 includes:

The transceiver unit 602 is further configured to receive the measured signal y _i through the i-th radio frequency channel to be calibrated; wherein the measured signal y _i is the calibration signal passing through the reference radio frequency channel, the free space link and the Obtained after the i-th radio frequency channel to be calibrated, 1≤i≤n, and i is an integer

The processing unit 601 is configured to determine the transmission coefficient of the i-th radio frequency channel to be calibrated; wherein, the transmission coefficient of the i-th radio frequency channel to be calibrated and the measured value of the calibration signal, the measured signal y _i The measured value is related to the transmission coefficient of the reference radio frequency channel.

In a possible implementation manner, the distance between two adjacent antennas among the n+1 antennas corresponding to one reference radio frequency channel and n radio frequency channels to be calibrated is equal.

In a possible implementation manner, one reference radio frequency channel and n+1 antennas corresponding to the n radio frequency channels to be calibrated constitute an antenna array, and the antenna array is a low-profile antenna.

In a possible implementation manner, n antennas corresponding to the n radio frequency channels to be calibrated are arranged in a rectangle, and one antenna corresponding to the reference radio frequency channel is located in the center of the rectangle.

Example 4:

The calibration device 6 includes:

The transceiver unit 602 is configured to transmit the calibration signal through n radio frequency channels to be calibrated at different times. The transceiver unit 602 is configured to receive a measured signal y _i through a reference device channel. The measured signal is obtained after the calibration signal passes through the i-th radio frequency channel to be calibrated, a free space link, and the reference radio frequency channel.

The processing unit 601 is used by the calibration device to determine the transmission coefficient of the i-th radio frequency channel to be calibrated, the transmission coefficient of the i-th radio frequency channel to be calibrated and the measured value of the calibration signal, the measured value of the measured signal y _i and the transmission of the reference radio frequency channel Coefficient.

The processing unit 601 is configured to calibrate the transmission coefficients of the n radio frequency channels to be calibrated based on the transmission coefficient of the reference radio frequency channel.

In a possible implementation manner, the n antennas corresponding to the n radio frequency channels to be calibrated are arranged in a rectangle, and one antenna corresponding to the reference radio frequency channel is located in the center of the rectangle.

The above embodiments of the calibration device only list the logical functions between the modules. For the specific execution process and beneficial effects, please refer to the corresponding method embodiments.

The calibration device 6 may be a terminal device or a network device, or may be a baseband chip, a decoder, a field-programmable gate array (FPGA), a dedicated integrated chip, or a system chip that implements related functions. , SoC), central processor (central processor), CPU, network processor (NP), digital signal processing circuit, microcontroller (micro controller (unit), MCU), or programmable controller (programmable) logic (device, PLD) or other integrated chips.

The embodiments of the present invention and the method embodiments of FIGS. 2A to 5B are based on the same concept, and the technical effects brought by the same are also the same. For the specific process, refer to the description of the method embodiments of FIGS.

7 is a schematic structural diagram of a calibration device according to an embodiment of the present invention. The calibration device 7 may be integrated into the foregoing network device or terminal device. The calibration device 7 includes a reference RF channel and n RF channels to be calibrated, each The channel includes 1 antenna (not shown in Figure 7). As shown in FIG. 7, the calibration device 7 further includes: a memory 702, a processor 701, and a transceiver 703.

The memory 702 may be an independent physical unit, and may be connected to the processor 701 and the transceiver 703 through a bus. The memory 702, the processor 701, and the transceiver 703 may also be integrated together, and implemented through hardware.

The memory 702 is used to store programs that implement the above method embodiments or various modules of the device embodiment, and the processor 701 calls the programs to perform the operations of the above method embodiments.

Optionally, when part or all of the method for calibrating the radio frequency channel in the foregoing embodiment is implemented by software, the device may also include only the processor. The memory for storing the program is located outside the device, and the processor is connected to the memory through a circuit/wire to read and execute the program stored in the memory.

The processor may be a central processing unit (CPU), a network processor (NP), or a combination of CPU and NP.

The processor may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The PLD may be a complex programmable logic device (complex programmable logic device (CPLD), a field programmable logic gate array (field-programmable gate array, FPGA), a general array logic (generic array logic, GAL), or any combination thereof.

The memory may include volatile memory (volatile memory), such as random access memory (random-access memory, RAM); the memory may also include non-volatile memory (non-volatile memory), such as flash memory (flash memory) , Hard disk drive (HDD) or solid-state drive (SSD); the memory may also include a combination of the above types of memory.

In the above embodiments, the sending module or the transmitter performs the steps sent by the above method embodiments, the receiving module or the receiver performs the steps received by the above method embodiments, and other steps are performed by other modules or processors. The sending module and the receiving module may constitute a transceiver module, and the receiver and the transmitter may constitute a transceiver.

An embodiment of the present application also provides a computer storage medium that stores a computer program, and the computer program is used to execute the method for calibrating the radio frequency channel provided by the foregoing embodiment.

An embodiment of the present application also provides a computer program product containing instructions, which, when it runs on a computer, causes the computer to perform the calibration method of the radio frequency channel provided by the foregoing embodiment.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

This application is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the application. It should be understood that each flow and/or block in the flowchart and/or block diagram and a combination of the flow and/or block in the flowchart and/or block diagram may be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processing machine, or other programmable data processing device to produce a machine that enables the generation of instructions executed by the processor of the computer or other programmable data processing device An apparatus for realizing the functions specified in one block or multiple blocks of one flow or multiple flows of a flowchart and/or one block or multiple blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, the instructions The device implements the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operating steps are performed on the computer or other programmable device to produce computer-implemented processing, which is executed on the computer or other programmable device The instructions provide steps for implementing the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.

Claims

A calibration method for radio frequency channels, characterized in that the calibration method is applied to a calibration device, the calibration device includes n radio frequency channels to be calibrated and a reference radio frequency channel, and each radio frequency channel includes an antenna. A reflection plate is provided in front of the calibration device, and the reflection plate is used for reflecting signals, and n is an integer greater than 0;

The calibration method includes:

Transmitting the calibration signal through the reference radio frequency channel;

Receiving the measured signal y i through the i-th radio frequency channel to be calibrated; wherein the measured signal is obtained after the calibration signal passes through the reference radio frequency channel, the i-th reflective link and the i-th device channel to be calibrated , The i-th reflection link represents the path that the signal transmitted by the antenna of the reference radio frequency channel passes through the reflector to the antenna of the i-th radio frequency channel to be calibrated; 1≤i≤n, and i Is an integer

Determining the transmission coefficient of the i-th radio frequency channel to be calibrated; wherein, the transmission coefficient of the i-th radio frequency channel to be calibrated and the measured value of the calibration signal, the measured value of the measured signal, the i-th reflection chain The transmission coefficient of the channel is related to one or more of the transmission coefficients of the reference radio frequency channel;

The transmission coefficients of the n radio frequency channels to be calibrated are calibrated based on the transmission coefficient of the reference radio frequency channel.
The method according to claim 1, wherein the transmission coefficient of the i-th reflection link is related to the path length and the reflection coefficient of the reflection plate.
The method according to claim 2, wherein the transmission coefficient of the i-th reflective link is obtained according to the following formula:

Where h i represents the transmission coefficient of the i-th reflective link, α represents the reflection coefficient of the reflector, d i represents the path length of the i-th reflective link, j represents the imaginary unit, and e represents the natural constant, π represents the pi.
The method according to claim 3, wherein the path length of the i-th reflective link and the distance between the antenna of the i-th radio frequency channel to be calibrated and the reflector, and the reference The distance between the antenna of the radio frequency channel and the antenna of the i-th radio frequency channel to be calibrated is related.
The method according to any one of claims 1 to 4, wherein the distance between two adjacent antennas in the n+1 antennas corresponding to the n radio frequency channels to be calibrated and one reference radio frequency channel is equal .
The method according to any one of claims 1 to 5, wherein n radio frequency channels to be calibrated and n+1 antennas corresponding to one reference radio frequency channel form an antenna array, and the antenna array is a low-profile antenna , The antenna array is perpendicular to the reflecting plate, or perpendicular to the reflecting plate.
A radio frequency channel calibration method, characterized in that the calibration method is applied to a calibration device, the calibration device is provided with a reference radio frequency channel and n radio frequency channels to be calibrated, each radio frequency channel includes an antenna;

The calibration method includes:

Transmitting the calibration signal through the reference radio frequency channel;

Receiving the measured signal y i through the i-th radio frequency channel to be calibrated; wherein the measured signal y i is obtained after the calibration signal passes through the reference radio frequency channel, free space and the i-th radio frequency channel to be calibrated , 1≤i≤n, and i is an integer

Determining the transmission coefficient of the i-th radio frequency channel to be calibrated; wherein, the transmission coefficient of the i-th radio frequency channel to be calibrated and the measured value of the calibration signal, the measured value of the measured signal and the reference radio frequency channel Related to the transmission coefficient;

The transmission coefficients of the n radio frequency channels to be calibrated are calibrated based on the transmission coefficient of the reference radio frequency channel.
The method according to claim 7, wherein the distance between two adjacent antennas among the n+1 antennas corresponding to one reference radio frequency channel and n radio frequency channels to be calibrated is equal.
The method according to claim 7 or 8, wherein one reference radio frequency channel and n+1 antennas corresponding to the n radio frequency channels to be calibrated form an antenna array, and the antenna array is a low-profile antenna.
The method according to claim 9, wherein the n antennas corresponding to the n radio frequency channels to be calibrated are arranged in a rectangle, and one antenna corresponding to the reference radio frequency channel is located in the center of the rectangle.
A calibration device, characterized in that the calibration device includes n radio frequency channels to be calibrated and a reference radio frequency channel, each radio frequency channel includes an antenna, and a reflection plate is arranged in front of the calibration device, the reflection The board is used to reflect the signal, n is an integer greater than 0;

The calibration device further includes: a transceiver, a processor, and a memory, wherein the memory stores programs and data necessary for the calibration device;

The transceiver is used to transmit the calibration signal through the reference radio frequency channel;

The transceiver is further configured to receive the measured signal y i through the i-th radio frequency channel to be calibrated; wherein the measured signal is the calibration signal passing through the reference radio frequency channel, the i-th reflective link and the Obtained after i device channels to be calibrated, the i th reflection link represents the path that the signal transmitted by the antenna of the reference radio frequency channel passes through the reflection plate to the antenna of the i radio frequency channel to be calibrated; 1≤i≤n, and i is an integer;

The processor calls the programs and data in the memory for execution:

Determining the transmission coefficient of the i-th radio frequency channel to be calibrated; wherein, the transmission coefficient of the i-th radio frequency channel to be calibrated and the measured value of the calibration signal, the measured value of the measured signal, the i-th reflection chain The transmission coefficient of the channel is related to one or more of the transmission coefficients of the reference radio frequency channel;

The transmission coefficients of the n radio frequency channels to be calibrated are calibrated based on the transmission coefficient of the reference radio frequency channel.
The apparatus according to claim 11, wherein the transmission coefficient of the i-th reflection link is related to the path length and the reflection coefficient of the reflection plate.
The apparatus according to claim 12, wherein the transmission coefficient of the i-th reflective link is obtained according to the following formula:

Where h i represents the transmission coefficient of the i-th reflective link, α represents the reflection coefficient of the reflector, d i represents the path length of the i-th reflective link, j represents the imaginary unit, and e represents the natural constant, π represents the pi.
The device according to claim 13, wherein the path length of the i-th reflective link and the distance between the antenna of the i-th radio frequency channel to be calibrated and the reflector, and the reference The distance between the antenna of the radio frequency channel and the antenna of the i-th radio frequency channel to be calibrated is related.
The device according to any one of claims 11 to 14, wherein the distance between two adjacent antennas in the n+1 antennas corresponding to the n RF channels to be calibrated and one reference RF channel is equal .
The device according to any one of claims 11 to 15, wherein n radio frequency channels to be calibrated and n+1 antennas corresponding to one reference radio frequency channel form an antenna array, and the antenna array is a low-profile antenna , The antenna array is perpendicular to the reflecting plate, or perpendicular to the reflecting plate.
A calibration device, characterized in that the calibration device includes a reference radio frequency channel and n radio frequency channels to be calibrated, and each radio frequency channel includes an antenna;

The calibration device further includes: a transceiver, a processor, and a memory, wherein the memory stores programs and data necessary for the calibration device;

The transceiver is used to transmit the calibration signal through the reference radio frequency channel;

The transceiver is also used to receive the measured signal y i through the i-th radio frequency channel to be calibrated; wherein, the measured signal is the calibration signal passing through the reference radio frequency channel, free space and the i-th Obtained after calibrating the radio frequency channel, 1≤i≤n, and i is an integer;

The processor calls the programs and data in the memory for execution:

Determining the transmission coefficient of the i-th radio frequency channel to be calibrated; wherein, the transmission coefficient of the i-th radio frequency channel to be calibrated and the measured value of the calibration signal, the measured value of the measured signal and the reference radio frequency channel Related to the transmission coefficient;

The transmission coefficients of the n radio frequency channels to be calibrated are calibrated based on the transmission coefficient of the reference radio frequency channel.
The device according to claim 17, wherein the distance between two adjacent antennas among the n+1 antennas corresponding to the one reference radio frequency channel and the n radio frequency channels to be calibrated is equal.
The device according to claim 17 or 18, wherein one reference radio frequency channel and n+1 antennas corresponding to the n radio frequency channels to be calibrated form an antenna array, and the antenna array is a low-profile antenna.
The apparatus according to claim 19, wherein the n antennas corresponding to the n radio frequency channels to be calibrated are arranged in a rectangle, and one antenna corresponding to the reference radio frequency channel is located at the center of the rectangle.
A computer storage medium including instructions which, when run on a computer, cause the computer to perform the method according to any one of claims 1 to 10.
A computer program product containing instructions that, when run on a computer, causes the computer to perform the method according to any one of claims 1 to 10.