CN113258966A

CN113258966A - Channel synchronization method and device based on multi-antenna wireless communication system

Info

Publication number: CN113258966A
Application number: CN202110682650.9A
Authority: CN
Inventors: 唐杰; 王杏林; 罗乾峪; 马若炎; 胡俊承
Original assignee: Guangxi Zhongyi Intelligent Technology Development Group Co ltd; South China University of Technology SCUT
Current assignee: Guangxi Zhongyi Intelligent Technology Development Group Co ltd; South China University of Technology SCUT
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2021-08-13
Anticipated expiration: 2041-06-21
Also published as: CN113258966B

Abstract

The application relates to a channel synchronization method and device based on a multi-antenna wireless communication system. The method comprises the following steps: when a calibration trigger event of the multi-antenna wireless communication system is detected, determining reference channel characteristic information of reference radio frequency equipment; the reference channel characteristic information comprises reference amplitude information and reference phase information; and performing channel amplitude calibration on the plurality of radio frequency devices to be calibrated by adopting the reference amplitude information, and performing channel phase calibration on the plurality of radio frequency devices to be calibrated by adopting the reference phase information so as to synchronize the radio frequency channels of the plurality of calibrated radio frequency devices with the radio frequency channels of the reference radio frequency devices. The method can realize the synchronization of multiple channels in the multi-antenna wireless communication system, and can make the characteristics of the multiple channels consistent by compensating the inconsistent amplitude and phase of the radio frequency part for calibration, thereby avoiding the need of a huge power division network, improving the flexibility of the communication system, reducing the equipment cost and avoiding the influence on the consistency of the channels due to the aging of devices.

Description

Channel synchronization method and device based on multi-antenna wireless communication system

Technical Field

The present application relates to the field, and in particular, to a channel synchronization method and apparatus, a communication device, and a storage medium based on a multi-antenna wireless communication system.

Background

With the rapid development of mobile communication technology, a fifth generation mobile communication system (5G) is extended after the fourth generation mobile communication system (4G) in order to meet the increasing mobile data traffic and the increasing demand of connected devices, and face the emerging new services and new application scenarios. A Massive antenna technology (Massive MIMO, multiple input multiple output) is one of the core technologies of 5G, and a wireless communication system based on Massive MIMO can utilize the spatial freedom provided by an antenna to multiplex messages for multiple users on the same time-frequency resource and focus a radiation signal to a target user.

Focusing of the radiated signals in a particular direction can be achieved by beamforming techniques such that the signals coherently overlap at the desired target location, but strict phase and amplitude synchronization of the radio frequency channels in the wireless communication system is required.

In the prior art, aiming at the problem of multi-channel synchronization in a wireless communication system based on Massive MIMO, a power division network formed by power dividers is generally adopted to realize multi-channel synchronization, but under the condition of a large number of channels, a huge power division network is required, so that the volume of the communication system is greatly increased, the high-precision power division network has a complex structure and high cost, and along with the aging of devices, the working characteristics of the power division network also change, so that the performance consistency of each channel is influenced.

Disclosure of Invention

In view of the above, it is necessary to provide a channel synchronization method, an apparatus, a communication device and a storage medium based on a multi-antenna wireless communication system, which can solve the above problems.

A channel synchronization method based on a multi-antenna wireless communication system, the method comprising:

determining reference channel characteristic information of a reference radio frequency device when a calibration triggering event of the multi-antenna wireless communication system is detected; the reference channel characteristic information comprises reference amplitude information and reference phase information;

and performing channel amplitude calibration on a plurality of radio frequency devices to be calibrated by adopting the reference amplitude information, and performing channel phase calibration on the plurality of radio frequency devices to be calibrated by adopting the reference phase information so as to synchronize radio frequency channels of the plurality of calibrated radio frequency devices with radio frequency channels of the reference radio frequency devices.

In one embodiment, the reference rf device includes a reference rf receiver and a reference rf transmitter, and the determining the reference channel characteristic information of the reference rf device includes:

if the reference radio frequency equipment is a reference radio frequency receiver, determining the signal amplitude of a first receiving channel and the signal phase of the first receiving channel of the reference radio frequency receiver, and taking the signal amplitude of the first receiving channel and the signal phase of the first receiving channel as reference amplitude information and reference phase information;

if the reference radio frequency device is a reference radio frequency transmitter, determining the signal amplitude of a first transmitting channel of the reference radio frequency transmitter and the signal phase of the first transmitting channel, and using the signal amplitude of the first transmitting channel and the signal phase of the first transmitting channel as reference amplitude information and reference phase information.

In one embodiment, the determining the signal amplitude and the signal phase of the first receive channel of the reference rf receiver comprises:

acquiring a first digital signal of the first receiving channel;

and determining the signal amplitude of the first receiving channel and the signal phase of the first receiving channel according to the first digital signal.

In an embodiment, when the reference radio frequency device is a reference radio frequency receiver, the plurality of radio frequency devices to be calibrated are a plurality of radio frequency receivers to be calibrated, and performing channel amplitude calibration on the plurality of radio frequency devices to be calibrated by using the reference amplitude information includes:

for each radio frequency receiver to be calibrated, acquiring a second digital signal of a second receiving channel of the radio frequency receiver to be calibrated, and determining the signal amplitude of the second receiving channel according to the second digital signal;

obtaining a first amplitude calibration factor corresponding to the second receiving channel by adopting the signal amplitude of the first receiving channel and the signal amplitude of the second receiving channel, and performing channel amplitude calibration according to the first amplitude calibration factor to obtain a second digital signal after amplitude calibration;

the performing channel phase calibration on the plurality of radio frequency devices to be calibrated by using the reference phase information includes:

for each radio frequency receiver to be calibrated, determining the signal phase of the second receiving channel according to the second digital signal after amplitude calibration, and determining the phase difference between the signal phase of the second receiving channel and the signal phase of the first receiving channel;

and obtaining a first phase calibration factor corresponding to the second receiving channel according to the phase difference, and performing channel phase calibration according to the first phase calibration factor to obtain a second digital signal after phase calibration.

In one embodiment, the determining the signal amplitude and the signal phase of the first transmit channel of the reference radio frequency transmitter comprises:

acquiring a third digital signal of the first transmission channel;

and determining the signal amplitude of the first transmission channel and the signal phase of the first transmission channel according to the third digital signal.

In an embodiment, when the reference radio frequency device is a reference radio frequency transmitter, the plurality of radio frequency devices to be calibrated are a plurality of radio frequency transmitters to be calibrated, and performing channel amplitude calibration on the plurality of radio frequency devices to be calibrated by using the reference amplitude information includes:

for each radio frequency transmitter to be calibrated, acquiring a fourth digital signal of a second transmitting channel of the radio frequency transmitter to be calibrated, and determining the signal amplitude of the second transmitting channel according to the fourth digital signal;

obtaining a second amplitude calibration factor corresponding to the second transmitting channel by using the signal amplitude of the first transmitting channel and the signal amplitude of the second transmitting channel, and performing channel amplitude calibration according to the second amplitude calibration factor to obtain a fourth digital signal after amplitude calibration;

for each radio frequency transmitter to be calibrated, determining a phase difference absolute value of the first transmission channel and the second transmission channel according to the fourth digital signal after amplitude calibration and the third digital signal of the first transmission channel;

and determining a second phase calibration factor corresponding to the second transmitting channel according to the absolute value of the phase difference, and performing channel phase calibration according to the second phase calibration factor to obtain a fourth digital signal after phase calibration.

In one embodiment, the multi-antenna wireless communication system includes a plurality of antenna elements, and before the step of determining the reference channel characteristic information of the reference radio frequency device, the method further includes:

when the reference radio frequency equipment is a reference radio frequency receiver, the plurality of antenna array elements are a plurality of receiving antenna array elements, a first receiving channel of the reference radio frequency receiver is fixedly connected with the first receiving antenna array element, and second receiving channels of the plurality of radio frequency receivers to be calibrated are respectively connected with the plurality of second receiving antenna array elements one by one;

and when the reference radio frequency equipment is a reference radio frequency transmitter, the plurality of antenna array elements are a plurality of transmitting antenna array elements, a first transmitting channel of the reference radio frequency transmitter is fixedly connected with the first transmitting antenna array elements, and second transmitting channels of the plurality of radio frequency transmitters to be calibrated are respectively connected with the plurality of second transmitting antenna array elements one by one.

A channel synchronization apparatus based on a multi-antenna wireless communication system, the apparatus comprising:

the reference channel characteristic information determining module is used for determining reference channel characteristic information of the reference radio frequency equipment when a calibration triggering event of the multi-antenna wireless communication system is detected; the reference channel characteristic information comprises reference amplitude information and reference phase information;

and the calibration module is used for performing channel amplitude calibration on a plurality of radio frequency devices to be calibrated by adopting the reference amplitude information and performing channel phase calibration on the plurality of radio frequency devices to be calibrated by adopting the reference phase information so as to synchronize radio frequency channels of the plurality of calibrated radio frequency devices with radio frequency channels of the reference radio frequency devices.

A communication device comprising a memory storing a computer program and a processor implementing the steps of the method for channel synchronization based on a multi-antenna wireless communication system as described above when executing the computer program.

A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method for channel synchronization for a multi-antenna based wireless communication system as set forth above.

The channel synchronization method, the device, the communication equipment and the storage medium based on the multi-antenna wireless communication system determine the reference channel characteristic information of the reference radio frequency equipment when detecting the calibration trigger event of the multi-antenna wireless communication system, the reference channel characteristic information comprises the reference amplitude information and the reference phase information, further the reference amplitude information is adopted to carry out channel amplitude calibration on the plurality of radio frequency equipment to be calibrated, and the reference phase information is adopted to carry out channel phase calibration on the plurality of radio frequency equipment to be calibrated, so that the radio frequency channels of the plurality of calibrated radio frequency equipment are synchronized with the radio frequency channels of the reference radio frequency equipment, the synchronization of multiple channels in the multi-antenna wireless communication system is realized, the calibration is carried out by compensating the amplitude phase inconsistency of the radio frequency part, the characteristics of the multiple channels are consistent, a huge power division network is not needed, and the flexibility of the communication system is improved, the equipment cost is reduced, and the influence on the consistency of the channel due to the aging of the device is avoided.

Drawings

Fig. 1 is a flow chart illustrating a channel synchronization method in a multi-antenna based wireless communication system according to an embodiment;

FIG. 2 is a diagram of a wireless communication system architecture in one embodiment;

FIG. 3 is a flow chart illustrating a receive channel calibration step according to one embodiment;

FIG. 4 is a diagram illustrating calibration results for a receive channel, according to one embodiment;

FIG. 5 is a flow chart illustrating a transmit channel calibration step according to one embodiment;

FIG. 6a is a diagram illustrating calibration results for a transmit channel in one embodiment;

FIG. 6b is a schematic diagram of a receive antenna array in one embodiment;

FIG. 6c is a schematic diagram of a transmit antenna array in one embodiment;

fig. 7 is a block diagram of a channel synchronization apparatus of a multi-antenna based wireless communication system according to an embodiment;

FIG. 8 is a diagram of an internal structure of a computer device, in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In one embodiment, as shown in fig. 1, a channel synchronization method based on a multi-antenna wireless communication system is provided, and this embodiment is illustrated as applying the method to a communication device, it is to be understood that the method may also be applied to a terminal or a server, and may also be applied to a system including a terminal and a server, and is implemented by interaction between the terminal and the server. In this embodiment, the method includes the steps of:

step 101, when a calibration trigger event of the multi-antenna wireless communication system is detected, determining reference channel characteristic information of a reference radio frequency device; the reference channel characteristic information comprises reference amplitude information and reference phase information;

as an example, the calibration triggering event may be performing consistency calibration on the amplitude and phase of multiple channels in the multi-antenna wireless communication system, which may perform calibration after each system power-up, that is, confirming detection of the calibration triggering event to perform amplitude-phase calibration of multiple channels when the multi-antenna wireless communication system is powered up.

In practical application, when the multi-antenna wireless communication system is powered on, it may be confirmed that a calibration trigger event for the multi-antenna wireless communication system is detected, and then reference channel characteristic information of the reference radio frequency device may be determined, where the reference channel characteristic information may include reference amplitude information and reference phase information, so as to further perform multi-channel amplitude-phase calibration according to the reference amplitude information and the reference phase information.

Specifically, after the multi-antenna wireless communication system is powered on each time, consistency calibration can be performed on a plurality of receiving channels in the communication system according to the receiving channel amplitude-phase characteristics of the reference radio frequency receiver as a reference (i.e., reference channel characteristic information of the reference radio frequency device); and the consistency calibration can be carried out on the plurality of transmitting channels in the communication system according to the transmitting channel amplitude-phase characteristics of the reference radio frequency transmitter as a reference (namely the reference channel characteristic information of the reference radio frequency device).

And step 102, performing channel amplitude calibration on a plurality of radio frequency devices to be calibrated by using the reference amplitude information, and performing channel phase calibration on the plurality of radio frequency devices to be calibrated by using the reference phase information, so that radio frequency channels of the plurality of calibrated radio frequency devices are synchronized with radio frequency channels of the reference radio frequency devices.

After the reference channel characteristic information is obtained, the reference channel characteristic information may include reference amplitude information and reference phase information, and thus channel amplitude calibration may be performed on the plurality of radio frequency devices to be calibrated using the reference amplitude information, and channel phase calibration may be performed on the plurality of radio frequency devices to be calibrated using the reference phase information, so that radio frequency channels of the plurality of calibrated radio frequency devices are synchronized with radio frequency channels of the reference radio frequency devices.

For example, during calibration, the receiving channels of the remaining multiple radio frequency receivers in the communication system may be subjected to consistency calibration according to the amplitude-phase characteristic of the receiving channel of the radio frequency receiver 0 as a reference, so as to achieve that the channel amplitudes of the remaining multiple radio frequency receivers are consistent with the channel amplitudes of the radio frequency receiver 0.

For another example, during calibration, consistency calibration may be performed on the transmission channels of the remaining plurality of radio frequency transmitters in the communication system according to the amplitude-phase characteristic of the transmission channel of the radio frequency transmitter 0 as a reference, so as to achieve that the channel amplitudes of the remaining plurality of radio frequency transmitters are consistent with the channel amplitudes of the radio frequency transmitter 0.

In an example, as shown in fig. 2, based on a wireless communication system architecture, at a transmitting end, a digital signal processing module may perform encoding, modulation, and other processing on information to be transmitted, and then output a corresponding digital signal to a radio frequency transmitter, where the radio frequency transmitter may perform D/a conversion on an input digital signal (i.e., convert the digital signal into an analog signal) to obtain an analog signal, and perform radio frequency up-conversion, i.e., perform frequency mixing processing on the input signal and a radio frequency local oscillator to obtain radio frequency output, and then an output signal of a radio frequency transceiver may be transmitted through a transmitting antenna array.

At the receiving end, by receiving the signals received by the antenna array, radio frequency down-conversion and a/D conversion (i.e., converting analog signals into digital signals) can be performed in the radio frequency receiver, and then the obtained digital signals can be output to the digital signal processing module, which can process the digital signals.

Taking channel 0 as an example, the flow direction and transformation of signals in fig. 2 are explained:

at the transmitting end, the digital signal processing module may transmit the encoded and modulated intermediate frequency digital signal to the radio frequency transmitter, where a complex signal expression of the signal may be:

wherein the content of the first and second substances,IF _T0 [k/f _s]is the intermediate frequency digital signal of channel 0, k is the kth sample point of the digital signal,f _sis the sampling frequency of the signal and,A _IFT0 [k/f _s]in order to be the amplitude of the signal,f _IFis the carrier frequency of the intermediate frequency signal,φ _IFT0[k/f _s]is the signal phase.

Amplitude-phase modulation, i.e. by varyingA _IFT0 [k/f _s]Andφ _IFT0[k/f _s]to carry the signals to be transmitted. Since there is no complex signal in the actual scene, the complex signal is actually a set of two real signals, which respectively represent the real part and the imaginary part of the complex signal:

wherein the content of the first and second substances,IF _TI0 [k/f _s]the real part of the complex signal (the cocurrent path, the I path),IF _TQ0 [k/f _s]the imaginary part (quadrature path, Q path) of the complex signal is converted into an analog intermediate frequency signal by D/a conversion in the rf transmitter, and can be represented as follows:

wherein the content of the first and second substances,IF _TI0(t) In order to simulate the I path of the intermediate frequency signal,IF _TQ0(t) In order to simulate the Q path of the intermediate frequency signal, the intermediate frequency signal may be sent to an up-conversion module of the radio frequency transmitter for frequency mixing, that is, multiplied by a corresponding radio frequency signal source, and the expressions of the radio frequency signal sources of the I path and the Q path of the transmission channel 0 may be:

wherein the content of the first and second substances,RF _TI0(t) Is the I-way rf signal source for transmit channel 0,RF _TQ0(t) Which is the Q-way rf signal source for transmit channel 0,φ _RFT0is the phase of the I-path radio frequency signal source. I. The two paths of radio frequency signal sources of Q have the same amplitude and the phase difference is 90 DEG

Will be provided withIF _TI0(t)、IF _TQ0(t)、RF _TI0(t)、RF _TQ0(t) Mixing is performed at an up-conversion module of the radio frequency transmitter, and the radio frequency output can be obtained as follows:

wherein the content of the first and second substances,A _RFT0module gain due to up-conversion module of transmit channel 0, of different channelsA _RFTDue to slight differences in the operating conditions of the rf transmitter, the supply voltage, the ambient temperature and device aging,S _out0(t) Which is the output of radio frequency channel 0, which may be transmitted through an antenna.

Electromagnetic wave signals are subjected to amplitude attenuation in space, an additional phase shift exists when the electromagnetic wave signals reach a receiving antenna, noise exists in a wireless environment, the receiving antenna can receive the noise at the same time, signals transmitted by a radio frequency channel 0 reach the receiving antenna, and the expression can be that:

wherein the content of the first and second substances,A _Ffor the amplitude fading factor of the wireless channel,φ _C0an additional phase shift in the wireless channel for the signal output by transmit channel 0,n ₀(t) Is additive white Gaussian noise, obeys mean value of 0 and variance of sigma₀ ²A gaussian distribution of (a).

Input signalS _in0(t) Mixing is performed in a down-conversion module of the rf receiver, and the expressions of the rf signal sources of the I path and the Q path of the receiving channel 0 may be:

wherein the content of the first and second substances,RF _RI0(t) To receive the I-path rf signal source for channel 0,RF _RQ0(t) To receive the Q rf signal source for channel 0,φ _RFR0for the phase of the I-path rf signal source, the amplitudes of the I, Q two paths of rf signal sources are the same, and the phase difference is 90 °.

Will be provided withS _in0(t)、RF _RI0(t)、RF _RQ0(t) Mixing is performed in a down-conversion module of the radio frequency receiver, and then a double frequency component can be filtered out through a low-pass filter, so that the obtained intermediate frequency output can be:

wherein the content of the first and second substances,A _RFR0the block gain introduced to the down conversion block of receive channel 0,n _IFI0(t)，n _IFQ0(t) As noisen ₀(t) And (4) performing down-conversion and low-pass filtering on the obtained product.

Two-way intermediate frequency analog signalIF _RI0(t) AndIF _RQ0(t) After sampling by ADC module in RF receiver, discrete digital signal can be obtainedIF _RI0 [k/f _s]AndIF _RQ0 [k/f _s]and then may be output to a digital signal processing block for demodulation as the real and imaginary parts of the complex signal, respectively.

It can be known from the above that, for a multi-antenna wireless communication system, it is necessary to maintain the amplitude-phase consistency of the transmitting channel and the receiving channel, so that the amplitude modulation and the phase shift of the beamforming on each channel can obtain correct results under the condition that the original amplitude and phase of each channel are consistent.

The rf transmitter and the rf receiver may have one or more channels, and in the case of using an internal rf local oscillator, multiple channels in a single rf transceiver may achieve synchronization, but the number of antennas in a Massive MIMO based wireless communication system is large, for example, the number of antennas is more than 64, and multiple rf transceivers need to be used. Because the phase of the local oscillator inside each radio frequency transceiver is uncertain after each radio frequency transceiver is powered on, the traditional single calibration cannot solve the synchronization problem of each radio frequency channel.

The mode that an external local oscillator is used as the external local oscillator input of a plurality of radio frequency transceivers through a power divider in a multipath manner needs a huge power division network under the condition of more channel numbers, so that the volume of a communication system is greatly increased, and the high-precision power division network for ensuring accurate channel characteristics is complex in structure and high in cost.

In this application, through adopting digital signal processing module to compensate the inconsistent of amplitude and phase of radio frequency part, can make the multichannel characteristic unanimous, thereby realize the synchronization of many antennas wireless communication system multichannel, it need not huge merit and divides the network, because every radio frequency transceiver can adopt inside local oscillator, then can increase the passageway figure through the mode that increases the radio frequency transceiver, communication system's flexibility has been promoted, the equipment cost has effectively been reduced, and carry out the amplitude and phase calibration of each passageway after equipment is gone up at every turn, make the device of each passageway age and can not cause the influence to the passageway uniformity after the calibration, can realize correcting the time-invariant error and the time-varying error of passageway.

In the embodiment of the present application, by detecting a calibration trigger event of the multi-antenna wireless communication system, determining reference channel characteristic information of a reference radio frequency device, the reference channel characteristic information including reference amplitude information and reference phase information, further, the reference amplitude information is adopted to carry out channel amplitude calibration on a plurality of radio frequency devices to be calibrated, and the reference phase information is adopted to carry out channel phase calibration on a plurality of radio frequency devices to be calibrated, so that the radio frequency channels of the calibrated radio frequency devices are synchronized with the radio frequency channel of the reference radio frequency device, thereby realizing the synchronization of multiple channels in the multi-antenna wireless communication system, by compensating for the inconsistent amplitude and phase of the radio frequency part for calibration, the multichannel characteristics can be consistent, a huge power division network is not needed, the flexibility of a communication system is improved, the equipment cost is reduced, and the influence on the consistency of the channels due to the aging of devices is avoided.

In one embodiment, the reference rf device may include a reference rf receiver and a reference rf transmitter, and the determining the reference channel characteristic information of the reference rf device may include the steps of:

the first receiving channel may be any one of the reference rf receivers, and since the reference rf receiver may have one or more channels, one of the receiving channels may be used as the first receiving channel.

In a specific implementation, when performing consistency calibration on the receiving channels, the signal amplitude of the first receiving channel and the signal phase of the first receiving channel of the reference rf receiver may be determined, and then the signal amplitude of the first receiving channel and the signal phase of the first receiving channel may be used as reference amplitude information and reference phase information, for example, the receiving channel amplitude-phase characteristics (i.e., the signal amplitude of the first receiving channel and the signal phase of the first receiving channel) of the rf receiver 0 (i.e., the reference rf receiver) may be used as a reference.

The first transmission channel may be any one of the reference rf transmitters, and since the reference rf transmitter may have one or more channels, one of the transmission channels may be used as the first transmission channel.

In a specific implementation, when the transmission channels are subjected to consistency calibration, the signal amplitude of the first transmission channel and the signal phase of the first transmission channel of the reference radio frequency transmitter may be determined, and then the signal amplitude of the first transmission channel and the signal phase of the first transmission channel may be used as the reference amplitude information and the reference phase information, for example, the transmission channel amplitude phase characteristics (i.e., the signal amplitude of the first transmission channel and the signal phase of the first transmission channel) of the radio frequency receiver 0 (i.e., the reference radio frequency transmitter) may be used as a reference.

By the above embodiment, if the reference radio frequency device is the reference radio frequency receiver, the signal amplitude of the first receiving channel and the signal phase of the first receiving channel of the reference radio frequency receiver are determined, and the signal amplitude of the first receiving channel and the signal phase of the first receiving channel are used as the reference amplitude information and the reference phase information.

In one embodiment, the determining the signal amplitude of the first receiving channel and the signal phase of the first receiving channel of the reference rf receiver may include the steps of:

acquiring a first digital signal of the first receiving channel; and determining the signal amplitude of the first receiving channel and the signal phase of the first receiving channel according to the first digital signal.

For example, a single carrier signal is transmitted through a transmission channel, and the digital signal processing module may perform absolute value calculation and then average value calculation on a digital signal (i.e., a first digital signal) of a reception channel of the reference radio frequency receiver, so as to obtain a received signal amplitude (i.e., a signal amplitude of the first reception channel) of the channel, and may also calculate a phase of the reception channel (i.e., a signal phase of the first reception channel).

The first digital signal of the first receiving channel is obtained through the embodiment, and then the signal amplitude of the first receiving channel and the signal phase of the first receiving channel are determined according to the first digital signal, so that the reference amplitude information and the reference phase information of the reference radio frequency receiver can be obtained, and reference data support is provided for amplitude-phase consistency calibration of multiple receiving channels.

In an embodiment, as shown in fig. 3, when the reference radio frequency device is a reference radio frequency receiver, the multiple radio frequency devices to be calibrated are multiple radio frequency receivers to be calibrated, and performing channel amplitude calibration on the multiple radio frequency devices to be calibrated by using the reference amplitude information may include the following steps:

step 301, for each rf receiver to be calibrated, obtaining a second digital signal of a second receiving channel of the rf receiver to be calibrated, and determining a signal amplitude of the second receiving channel according to the second digital signal;

the second receiving channel may be one of the receiving channels of the rf receiver (which has one or more channels) to be calibrated.

When the consistency calibration is performed on the receiving channels, a second digital signal of a second receiving channel of the radio frequency receiver to be calibrated can be obtained for each radio frequency receiver to be calibrated, and then the signal amplitude of the second receiving channel, that is, the signal amplitude of the receiving channel in the radio frequency receiver to be calibrated can be obtained according to the second digital signal.

In an example, the single carrier signal is transmitted through the transmission channel, and the digital signal processing module may perform absolute value calculation and then average value calculation on the digital signal (i.e., the second digital signal) of the multiple reception channels, so as to obtain the received signal amplitude (i.e., the signal amplitude of the second reception channel) of each channel.

Step 302, obtaining a first amplitude calibration factor corresponding to the second receiving channel by using the signal amplitude of the first receiving channel and the signal amplitude of the second receiving channel, and performing channel amplitude calibration according to the first amplitude calibration factor to obtain an amplitude-calibrated second digital signal;

after the signal amplitude of the second receiving channel is obtained, a first amplitude calibration factor corresponding to the second receiving channel can be calculated according to the signal amplitude of the second receiving channel and the signal amplitude of the first receiving channel, and then channel amplitude calibration can be performed by adopting the first amplitude calibration factor to obtain a second digital signal after amplitude calibration, so that amplitude calibration of the receiving channel can be completed.

In an example, for each rf receiver to be calibrated, an amplitude calibration factor (i.e., a first amplitude calibration factor) of its receiving channel may be calculated, and then the digital intermediate frequency complex signal input by the receiving channel of each rf receiver to be calibrated may be multiplied by the corresponding amplitude calibration factor, so as to obtain a calibrated signal (i.e., an amplitude-calibrated second digital signal).

The performing channel phase calibration on the plurality of radio frequency devices to be calibrated by using the reference phase information may include the following steps:

step 303, for each rf receiver to be calibrated, determining a signal phase of the second receiving channel according to the amplitude-calibrated second digital signal, and determining a phase difference between the signal phase of the second receiving channel and the signal phase of the first receiving channel;

after the amplitude calibration of the receiving channel, for each rf receiver to be calibrated, the signal phase of the second receiving channel, that is, the signal phase of the receiving channel in the rf transmitter to be calibrated, is determined according to the second digital signal after the amplitude calibration, and then the phase difference between the signal phase of the second receiving channel and the signal of the first receiving channel can be calculated.

In an example, for each rf receiver to be calibrated, a phase of a receiving channel thereof (i.e. a signal phase of the second receiving channel) may be calculated, and then a phase difference between the two may be calculated according to the phase of the receiving channel in the rf receiver to be calibrated and the phase of the receiving channel in the reference rf receiver.

Step 304, obtaining a first phase calibration factor corresponding to the second receiving channel according to the phase difference, and performing channel phase calibration according to the first phase calibration factor to obtain a second digital signal after phase calibration.

After the phase difference is obtained, a first phase calibration factor corresponding to the second receiving channel can be obtained according to the phase difference, and then channel phase calibration can be performed according to the first phase calibration factor to obtain a second digital signal after phase calibration, so that phase calibration of the receiving channel can be completed.

In an example, for each rf receiver to be calibrated, a phase calibration factor (i.e., a first phase calibration factor) of its receiving channel may be obtained based on the phase difference, and then the digital intermediate frequency complex signal input by the receiving channel of each rf receiver to be calibrated may be multiplied by the corresponding phase calibration factor, so as to obtain a calibrated signal (i.e., a second digital signal after phase calibration).

Taking channel 0 as a first receiving channel of a reference radio frequency receiver and channels 1-N-1 as second receiving channels of a radio frequency receiver to be calibrated as examples, the consistency calibration of the receiving channels is explained as follows:

transmitting a single-carrier signal through a transmitting channel, and experiencing the same amplitude fading and phase shift in space to reach each receiving antenna, where the signal received by each receiving antenna may be:

wherein the content of the first and second substances,A _inin order to be the amplitude of the signal,(f _IF +f _RF )as signal frequency, the frequency being from an intermediate frequencyf _IFAnd radio frequency local oscillator frequencyf _RFIn a joint decision, it is decided that,φ _inis the signal phase.

Because the calibration test can be performed under the near field condition, the signal-to-noise ratio of the signal is very high, and the noise can be ignored for simplifying the analysis, the digital signals of each channel can be obtained after the received signal is subjected to down-conversion and A/D conversion:

wherein the content of the first and second substances,A _RFRithe gain of the down-conversion module for each receive channel,φ _RFRithe local radio frequency oscillation phase of each receiving channel.

The above signals may be subjected to absolute value calculation and then to averaging processing, and the amplitude expression of the received signal input by each receiving channel may be obtained as follows:

wherein mean { } represents that the content in the mean is subjected to averaging processing.

According to the obtained amplitude of the received signal input by each receiving channel, a corresponding amplitude calibration factor (i.e. a first amplitude calibration factor) can be calculated, and can be expressed as follows:

digital intermediate frequency signals input by aiming at receiving channels of radio frequency receivers to be calibrated, namely 1-N-1 channelsIF _RiMultiplying by corresponding amplitude calibration factorsA _cRiFurther, the amplitude-calibrated signal (i.e., the amplitude-calibrated second digital signal) can be obtained as:

as can be seen from the above, the amplitudes of all the received signals after the consistency calibration are the same, namelyA _RFR0 A _inThereby completing the amplitude calibration of the receive channel.

By calculating the phase of the receiving channels 0-N-1, the method can be expressed as follows:

further, the phase difference between the 1-N-1 channel and the 0 channel can be obtained, and can be expressed by the following method:

the intermediate frequency complex signal input by the receiving channel, namely 1-N-1 channel, of each RF receiver to be calibrated

Multiplying by the corresponding phase calibration factor (i.e., the first phase calibration factor)e ^{-j∆φRi [k/fs]}Further, the phase-calibrated signal (i.e., the phase-calibrated second digital signal) can be obtained as follows:

as can be seen from the above, the phases of all the received signals after calibration are the same, and are (φ _in-φ _RFR0) And thus the phase calibration of the receive channel is completed, the amplitude-phase consistency calibration for the receive channel is completed.

In an example, as shown in fig. 4, it may characterize the simulation result of the calibration of the receiving channel, where the upper graph of fig. 4 is the channel I waveform before calibration (there is a certain amplitude difference and phase difference between channels 0 and 1), the middle graph of fig. 4 is the channel I waveform after amplitude calibration (the amplitude difference between

channels

0 and 1 is basically calibrated), and the lower graph of fig. 4 is the channel I waveform after phase calibration (the phase difference between

channels

0 and 1 is basically calibrated, and there is no difference between the two waveforms).

By the above embodiment, when the reference radio frequency device is a reference radio frequency receiver, for each radio frequency receiver to be calibrated, obtaining a second digital signal of a second receiving channel of the radio frequency receiver to be calibrated, determining a signal amplitude of the second receiving channel according to the second digital signal, then obtaining a first amplitude calibration factor corresponding to the second receiving channel by using the signal amplitude of the first receiving channel and the signal amplitude of the second receiving channel, performing channel amplitude calibration according to the first amplitude calibration factor to obtain a second digital signal after amplitude calibration, further determining a signal phase of the second receiving channel according to the second digital signal after amplitude calibration, determining a phase difference between the signal phase of the second receiving channel and the signal phase of the first receiving channel, and obtaining a first phase calibration factor corresponding to the second receiving channel according to the phase difference, and channel phase calibration is carried out according to the first phase calibration factor to obtain a second digital signal after phase calibration, so that synchronization of multiple receiving channels in the multi-antenna wireless communication system is realized, and multiple receiving channel characteristics can be consistent by compensating for inconsistent amplitude and phase of a radio frequency part for calibration.

In one embodiment, the determining the signal amplitude of the first transmit channel and the signal phase of the first transmit channel of the reference radio frequency transmitter may include the steps of:

acquiring a third digital signal of the first transmission channel; and determining the signal amplitude of the first transmission channel and the signal phase of the first transmission channel according to the third digital signal.

For example, a single carrier signal is transmitted through a transmission channel of the reference radio frequency transmitter, and the digital signal processing module may perform absolute value calculation and then average value calculation on the received digital signal from the transmission channel, so as to obtain a received signal amplitude (signal amplitude of the first transmission channel) corresponding to the transmission channel, and may also calculate a received signal phase (i.e., signal phase of the first transmission channel) corresponding to the transmission channel.

The third digital signal of the first transmitting channel is obtained through the embodiment, and then the signal amplitude of the first transmitting channel and the signal phase of the first transmitting channel are determined according to the third digital signal, so that the reference amplitude information and the reference phase information of the reference radio frequency transmitter can be obtained, and reference data support is provided for amplitude phase consistency calibration of multiple transmitting channels.

In an embodiment, as shown in fig. 5, when the reference radio frequency device is a reference radio frequency transmitter, the multiple radio frequency devices to be calibrated are multiple radio frequency transmitters to be calibrated, and performing channel amplitude calibration on the multiple radio frequency devices to be calibrated by using the reference amplitude information may include the following steps:

step 501, for each radio frequency transmitter to be calibrated, acquiring a fourth digital signal of a second transmitting channel of the radio frequency transmitter to be calibrated, and determining a signal amplitude of the second transmitting channel according to the fourth digital signal;

wherein the second transmit channel may be one of the transmit channels of the radio frequency transmitter (which has one or more channels) to be calibrated.

When the consistency calibration is performed on the transmitting channels, a fourth digital signal of a second transmitting channel of the radio frequency transmitter to be calibrated can be obtained for each radio frequency transmitter to be calibrated, and then the signal amplitude of the second transmitting channel, that is, the signal amplitude of the transmitting channel in the radio frequency transmitter to be calibrated can be obtained according to the fourth digital signal.

In an example, the single carrier signal is sequentially transmitted through the transmission channel of each radio frequency transmitter to be calibrated, and the digital signal processing module may perform absolute value calculation and then average value calculation on the received digital signal (i.e., the fourth digital signal) from each transmission channel, so as to obtain the received signal amplitude (the signal amplitude of the second transmission channel) corresponding to each transmission channel.

Step 502, obtaining a second amplitude calibration factor corresponding to the second transmitting channel by using the signal amplitude of the first transmitting channel and the signal amplitude of the second transmitting channel, and performing channel amplitude calibration according to the second amplitude calibration factor to obtain a fourth digital signal after amplitude calibration;

after the signal amplitude of the second transmitting channel is obtained, a second amplitude calibration factor corresponding to the second transmitting channel can be calculated according to the signal amplitude of the second transmitting channel and the signal amplitude of the first transmitting channel, and then the second amplitude calibration factor can be adopted to carry out channel amplitude calibration, so that a fourth digital signal after amplitude calibration is obtained, and therefore amplitude calibration of the transmitting channel can be completed.

In an example, for each rf transmitter to be calibrated, an amplitude calibration factor (i.e., a second amplitude calibration factor) of its transmit channel may be calculated, and then a digital intermediate frequency complex signal to be output by the transmit channel of each rf transmitter to be calibrated may be multiplied by the corresponding amplitude calibration factor, so as to obtain a calibrated signal (i.e., an amplitude-calibrated fourth digital signal).

step 503, for each radio frequency transmitter to be calibrated, determining a phase difference absolute value between the first transmission channel and the second transmission channel according to the fourth digital signal after amplitude calibration and the third digital signal of the first transmission channel;

after the amplitude calibration of the transmission channel, for each to-be-calibrated radio frequency transmitter, the absolute value of the phase difference between the first transmission channel and the second transmission channel may be calculated according to the fourth digital signal after the amplitude calibration and the third digital signal of the first transmission channel of the reference radio frequency transmitter.

In an example, for each to-be-calibrated radio frequency transmitter, a single carrier signal is simultaneously transmitted through a transmission channel of a reference radio frequency transmitter and a transmission channel of the to-be-calibrated radio frequency transmitter, the digital signal processing module may perform absolute value calculation and then average value calculation on the received signal to obtain an amplitude of a first received signal, then the two transmission channels simultaneously transmit the single carrier signal, but the single carrier transmitted by the transmission channel of the to-be-calibrated radio frequency transmitter is inverted, that is, the single carrier signal is directly inverted, and the digital signal processing module may perform absolute value calculation and then average value calculation on the received signal to obtain an amplitude of a second received signal, and further may calculate a phase difference absolute value of the two transmission channels.

Step 504, determining a second phase calibration factor corresponding to the second transmitting channel according to the absolute value of the phase difference, and performing channel phase calibration according to the second phase calibration factor to obtain a phase-calibrated fourth digital signal.

After the phase difference absolute value is obtained, a second phase calibration factor corresponding to the second transmitting channel can be obtained according to the phase difference absolute value, and then channel phase calibration can be performed according to the second phase calibration factor to obtain a fourth digital signal after phase calibration, so that phase calibration of the transmitting channel can be completed.

In an example, for each rf receiver to be calibrated, the single carrier of the transmit channel of the rf transmitter to be calibrated is phase-shifted twice, the third received signal amplitude and the fourth received signal amplitude that are phase-shifted are calculated as above, and the phase calibration factor of the transmit channel of the rf transmitter to be calibrated can be obtained by comparing the magnitudes of the third received signal amplitude and the fourth received signal amplitude.

Taking channel 0 as a first transmission channel of a reference radio frequency transmitter and channels 1-N-1 as second transmission channels of a radio frequency transmitter to be calibrated as examples, consistency calibration of the transmission channels is explained, the purpose of the transmission channel calibration is to adjust the signal amplitudes and phases of other transmission channels to be the same as those of transmission channel 0, and the following explanation takes transmission channel 0 and transmission channel 1 as examples:

transmitting single-carrier signals through a transmission channel 0 and a transmission channel 1, and experiencing the same amplitude fading and phase shift in space to reach a receiving antenna, the signals reaching the receiving antenna may be:

wherein the content of the first and second substances,A _in0to transmit the signal amplitude for channel 0,φ _in0is the signal phase of transmit channel 0;A _in1in order to transmit the signal amplitude of channel 1,φ _in1is the signal phase of transmit channel 1.

Since the calibration test can be performed in the near field, the signal-to-noise ratio of the signal is very high, and the noise can be ignored for simplifying the analysis, the digital signals of the transmission channel 0 and the transmission channel 1 obtained after the down-conversion and the a/D conversion of the received signal can be represented as follows:

the above signals may be subjected to absolute value calculation and then to averaging processing, and then amplitude expressions of the received signals corresponding to the transmission channel 0 and the transmission channel 1 may be obtained as follows:

according to the obtained amplitude of the received signal corresponding to the transmission channel, a corresponding amplitude calibration factor (i.e. a second amplitude calibration factor) can be calculated, and can be expressed as follows:

digital intermediate frequency signals to be output for each transmission channel

Multiplying by corresponding amplitude calibration factorsA _cTiFurther, the signal after the amplitude calibration (i.e. the fourth digital signal after the amplitude calibration) can be obtained as follows:

from the above, after the consistency calibration, the signal amplitudes of the transmission channel 0 and the transmission channel 1 are the same,A _RFR A _in0the remaining transmit channels to be calibrated may be processed as described above, thereby completing amplitude calibration of the transmit channels.

When the phase calibration is performed on the transmission channel, the transmission channel 0 and the transmission channel 1 may transmit a single carrier signal at the same time, and the received signal I path portion may be:

by taking the absolute value of the signal and then averaging, the amplitude can be obtained as:

then, the signal of the transmission channel 1 may be subjected to phase inversion, and the transmission channel 0 and the transmission channel 1 are made to simultaneously transmit the single carrier signal again, where the received signal I path portion may be:

further, the absolute value of the phase difference between the transmission channel 0 and the transmission channel 1 can be calculated, and can be expressed as follows:

wherein the content of the first and second substances,∆|φ _T1 |the absolute value of the phase difference between the transmission channel 0 and the transmission channel 1 can be represented, but the single carrier phase shift of the transmission channel 1 can be sequentially performed because the positive phase difference and the negative phase difference cannot be determined∆φ _T1And-∆φ _T1separately calculating the amplitude of the received signal as aboveA _i3AndA _i4by comparisonA _i3AndA _i4if the signals of the transmitting channel 0 and the transmitting channel 1 are in the same frequency and phase after the phase shift, the amplitude of the signal obtained after the in-phase superposition is the maximum, namely the phase shift value is correct.

Thus, by comparisonA _i3AndA _i4the phase shift value corresponding to the maximum amplitude is selected, and the phase calibration factor of the transmitting channel 1 can be obtained∆φ _T1Further, the intermediate frequency complex signal to be transmitted after the amplitude calibration of the transmitting channel 1 can be performed

Multiplying the phase calibration factore ^-j∆φT1Obtaining a phase-calibrated signal (i.e., a phase-calibrated fourth digital signal) as follows:

from the above, the phase of the signal of the calibrated transmission channel 0 is the same as that of the signal of the transmission channel 1, and is (1)φ _in0-φ _RFR) The remaining transmit channels to be calibrated may be processed as described above, thereby completing the phase calibration of the transmit channels.

In one example, as shown in fig. 6a, it can characterize the simulation result of the calibration of the transmitting channel, where the upper graph of fig. 6a is the waveform of the channel I before calibration (there is a certain amplitude difference and phase difference between the channels 0 and 1), the middle graph of fig. 6a is the waveform of the channel I after amplitude calibration (the amplitude difference between the

channels

0 and 1 is basically calibrated), and the lower graph of fig. 6a is the waveform of the channel I after phase calibration (the phase difference between the

channels

By the embodiment, when the reference radio frequency device is a reference radio frequency transmitter, for each radio frequency transmitter to be calibrated, a fourth digital signal of a second transmitting channel of the radio frequency transmitter to be calibrated is obtained, the signal amplitude of the second transmitting channel is determined according to the fourth digital signal, then a second amplitude calibration factor corresponding to the second transmitting channel is obtained by using the signal amplitude of the first transmitting channel and the signal amplitude of the second transmitting channel, channel amplitude calibration is performed according to the second amplitude calibration factor to obtain a fourth digital signal after amplitude calibration, further, for each radio frequency transmitter to be calibrated, a phase difference absolute value between the first transmitting channel and the second transmitting channel is determined according to the fourth digital signal after amplitude calibration and the third digital signal of the first transmitting channel, a second phase calibration factor corresponding to the second transmitting channel is determined according to the phase difference absolute value, and channel phase calibration is carried out according to the second phase calibration factor to obtain a fourth digital signal after phase calibration, synchronization of multiple transmitting channels in the multi-antenna wireless communication system is achieved, and multiple transmitting channel characteristics can be consistent by compensating for inconsistent amplitude and phase of the radio frequency part for calibration.

In one embodiment, the multi-antenna wireless communication system may include a plurality of antenna elements, and before the step of determining the reference channel characteristic information of the reference radio frequency device, the method may include the following steps:

in one example, when performing consistency calibration on the receiving channels, as shown in fig. 6b, the center in the figure is a transmitting antenna, which is connected by any transmitting channel, the receiving antenna arrays are arranged in a circular ring shape with the transmitting antenna as the center of the circle, and the receiving antenna arrays are connected with each receiving channel.

The array elements of the transmitting antenna and the receiving antenna array can adopt omnidirectional antennas with mutually matched polarization, thereby ensuring that the amplitude fading and the phase shift of the transmitting antenna reaching each receiving antenna array element are the same.

During calibration, the channel amplitude-phase characteristic of the radio frequency receiver 0 (i.e., a reference radio frequency receiver) may be used as a reference, one of the receiving channels (i.e., a first receiving channel) of the radio frequency receiver 0 is fixedly connected to one array element (i.e., a first receiving antenna array element) of the receiving antenna array, and then the receiving channels (i.e., a second receiving channel) of the other radio frequency receivers may be sequentially connected to the remaining array elements (i.e., a second receiving antenna array element), so as to achieve the channel amplitude-phase consistency of the other radio frequency receivers and the radio frequency receiver 0.

For example, the number of receiving channels is 32, the number of array elements of the receiving antenna array is 9, the number of receiving channels of the radio frequency receiver is 2, one of the receiving channels of the radio frequency receiver 0 can be fixedly connected with the array element 0 of the receiving antenna array, and then one of the receiving channels of the radio frequency receivers 1 to 8 can be connected with the array elements 1 to 8 of the receiving antenna array during first calibration, so as to realize amplitude-phase calibration of the radio frequency receivers 1 to 8; during the second calibration, one of the receiving channels of the rf receivers 9-15 may be connected to the array elements 1-7 of the receiving antenna array to achieve the amplitude-phase calibration of the rf receivers 9-15.

Since a plurality of receiving channels in a single radio frequency receiver all use the internal local oscillation and down-conversion module of the receiver, one of the channels can be calibrated, that is, all receiving channels of the radio frequency receiver can be calibrated.

In one example, when performing consistency calibration on the receiving channels, as shown in fig. 6c, the center in the figure is a receiving antenna, which is connected by any receiving channel, the transmitting antenna arrays are arranged in a circular ring shape with the receiving antenna as the center of the circle, and the transmitting antenna arrays are connected with each transmitting channel.

During the calibration, the channel amplitude-phase characteristic of the radio frequency transmitter 0 (i.e., the reference radio frequency transmitter) may be used as a reference, one of the transmission channels (i.e., the first transmission channel) of the radio frequency transmitter 0 is fixedly connected to one array element (i.e., the first transmission antenna array element) of the transmission antenna array, and then the transmission channels (i.e., the second transmission channels) of the other radio frequency transmitters may be sequentially connected to the remaining array elements (i.e., the second transmission antenna array elements) to achieve the channel amplitude-phase consistency between the other radio frequency transmitters and the radio frequency transmitter 0.

For example, the number of the transmitting channels is 32, the number of the array elements of the transmitting antenna array is 9, the number of the transmitting channels of the radio frequency transmitter is 2, one of the transmitting channels of the radio frequency transmitter 0 can be fixedly connected with the array elements 0 of the transmitting antenna array, and then one of the transmitting channels of the radio frequency transmitters 1 to 8 can be connected with the array elements 1 to 8 of the transmitting antenna array during first calibration, so that amplitude-phase calibration of the radio frequency transmitters 1 to 8 can be realized; during the second calibration, one of the transmitting channels of the rf transmitters 9-15 may be connected to the array elements 1-7 of the transmitting antenna array to achieve the amplitude-phase calibration of the rf transmitters 9-15.

Because a plurality of transmitting channels in a single radio frequency transmitter all use the internal local oscillator and the up-conversion module of the transmitter, one of the channels can be calibrated, namely, all transmitting channels of the radio frequency transmitter are calibrated.

With the above-described embodiments, the multi-antenna wireless communication system may include a plurality of antenna elements that, when the reference rf device is a reference rf receiver, the plurality of antenna elements are a plurality of receiving antenna elements, a first receiving channel of the reference radio frequency receiver is fixedly connected with the first receiving antenna elements, and the second receiving channels of the radio frequency receivers to be calibrated are respectively connected with the second receiving antenna array elements one by one, when the reference radio frequency equipment is a reference radio frequency transmitter, the plurality of antenna array elements are a plurality of transmitting antenna array elements, a first transmitting channel of the reference radio frequency transmitter is fixedly connected with the first transmitting antenna array elements, and the respective second transmitting channels of the plurality of radio frequency transmitters to be calibrated are respectively connected with the plurality of second transmitting antenna array elements one by one, so that the multi-channel in the multi-antenna wireless communication system can be synchronized, and the characteristics of the multi-channel are consistent.

It should be understood that although the various steps in the flow charts of fig. 1-6c are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-6c may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps or stages.

In one embodiment, as shown in fig. 7, there is provided a channel synchronization apparatus based on a multi-antenna wireless communication system, including:

a reference channel characteristic information determining module 701, configured to determine reference channel characteristic information of a reference radio frequency device when a calibration trigger event of the multi-antenna wireless communication system is detected; the reference channel characteristic information comprises reference amplitude information and reference phase information;

a calibration module 702, configured to perform channel amplitude calibration on multiple radio frequency devices to be calibrated by using the reference amplitude information, and perform channel phase calibration on the multiple radio frequency devices to be calibrated by using the reference phase information, so that radio frequency channels of the multiple calibrated radio frequency devices are synchronized with radio frequency channels of the reference radio frequency device.

In one embodiment, the reference rf device includes a reference rf receiver and a reference rf transmitter, the temperature image information includes a plurality of frames of temperature image information, and the reference channel characteristic information determining module 701 includes:

the receiver reference information determining submodule is used for determining the signal amplitude and the signal phase of a first receiving channel of the reference radio frequency receiver when the reference radio frequency equipment is the reference radio frequency receiver, and taking the signal amplitude and the signal phase of the first receiving channel as reference amplitude information and reference phase information;

and the transmitter reference information determining submodule is used for determining the signal amplitude and the signal phase of a first transmitting channel of the reference radio frequency transmitter when the reference radio frequency equipment is the reference radio frequency transmitter, and taking the signal amplitude and the signal phase of the first transmitting channel as reference amplitude information and reference phase information.

In one embodiment, the receiver reference information determination sub-module comprises:

a receiving channel digital signal acquiring unit, configured to acquire a first digital signal of the first receiving channel;

a receiver reference information determining unit, configured to determine a signal amplitude of the first receiving channel and a signal phase of the first receiving channel according to the first digital signal.

In one embodiment, when the reference rf device is a reference rf receiver, the plurality of rf devices to be calibrated are a plurality of rf receivers to be calibrated, and the calibration module 702 includes:

the first signal amplitude determining submodule is used for acquiring a second digital signal of a second receiving channel of the radio frequency receiver to be calibrated aiming at each radio frequency receiver to be calibrated and determining the signal amplitude of the second receiving channel according to the second digital signal;

the first amplitude calibration submodule is used for obtaining a first amplitude calibration factor corresponding to the second receiving channel by adopting the signal amplitude of the first receiving channel and the signal amplitude of the second receiving channel, and carrying out channel amplitude calibration according to the first amplitude calibration factor to obtain a second digital signal after amplitude calibration;

the calibration module 702 further comprises:

the phase difference determining submodule is used for determining the signal phase of the second receiving channel according to the second digital signal after the amplitude calibration and determining the phase difference between the signal phase of the second receiving channel and the signal phase of the first receiving channel aiming at each radio frequency receiver to be calibrated;

and the first phase calibration submodule is used for obtaining a first phase calibration factor corresponding to the second receiving channel according to the phase difference, and carrying out channel phase calibration according to the first phase calibration factor to obtain a second digital signal after phase calibration.

In one embodiment, the transmitter reference information determination submodule includes:

a transmission channel digital signal acquisition unit, configured to acquire a third digital signal of the first transmission channel;

a transmitter reference information determining unit, configured to determine, according to the third digital signal, a signal amplitude of the first transmission channel and a signal phase of the first transmission channel.

In one embodiment, when the reference rf device is a reference rf transmitter, the plurality of rf devices to be calibrated are a plurality of rf transmitters to be calibrated, and the calibration module 702 includes:

the second signal amplitude determining submodule is used for acquiring a fourth digital signal of a second transmitting channel of each radio frequency transmitter to be calibrated and determining the signal amplitude of the second transmitting channel according to the fourth digital signal;

the second amplitude calibration submodule is used for obtaining a second amplitude calibration factor corresponding to the second transmitting channel by adopting the signal amplitude of the first transmitting channel and the signal amplitude of the second transmitting channel, and carrying out channel amplitude calibration according to the second amplitude calibration factor to obtain a fourth digital signal after amplitude calibration;

the calibration module 702 further comprises:

the phase difference absolute value determining submodule is used for determining the phase difference absolute value of the first transmitting channel and the second transmitting channel according to the fourth digital signal after amplitude calibration and the third digital signal of the first transmitting channel aiming at each radio frequency transmitter to be calibrated;

and the second phase calibration submodule is used for determining a second phase calibration factor corresponding to the second transmitting channel according to the absolute value of the phase difference, and performing channel phase calibration according to the second phase calibration factor to obtain a fourth digital signal after phase calibration.

In one embodiment, the multi-antenna wireless communication system includes a plurality of antenna elements, the apparatus further includes:

the first antenna array element connecting module is used for fixedly connecting a first receiving channel of the reference radio frequency receiver with a first receiving antenna array element and respectively connecting second receiving channels of the radio frequency receivers to be calibrated with a plurality of second receiving antenna array elements one by one when the reference radio frequency equipment is the reference radio frequency receiver;

and the second antenna array element connecting module is used for fixedly connecting a first transmitting channel of the reference radio frequency transmitter with the first transmitting antenna array element and respectively connecting the respective second transmitting channels of the plurality of radio frequency transmitters to be calibrated with the plurality of second transmitting antenna array elements one by one when the reference radio frequency equipment is the reference radio frequency transmitter.

For specific limitations of a channel synchronization apparatus based on a multi-antenna wireless communication system, refer to the above limitations of a channel synchronization method based on a multi-antenna wireless communication system, which are not described herein again. The modules in the channel synchronization device of the multi-antenna based wireless communication system can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 8. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing channel synchronization data of the multi-antenna based wireless communication system. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a channel synchronization method for a multi-antenna based wireless communication system.

Those skilled in the art will appreciate that the architecture shown in fig. 8 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a communication device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:

In one embodiment, the processor when executing the computer program further implements the steps of the channel synchronization method based on the multi-antenna wireless communication system in the other embodiments described above.

In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:

In one embodiment, the computer program when executed by the processor further implements the steps of the channel synchronization method for a multi-antenna based wireless communication system in the other embodiments described above.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A channel synchronization method for a multi-antenna wireless communication system, the method comprising:

2. The method of claim 1, wherein the reference rf device comprises a reference rf receiver and a reference rf transmitter, and wherein determining the reference channel characterization information of the reference rf device comprises:

3. The method of claim 2, wherein determining the signal amplitude and the signal phase of the first receive channel of the reference rf receiver comprises:

acquiring a first digital signal of the first receiving channel;

4. The method according to claim 2 or 3, wherein when the reference rf device is a reference rf receiver, the plurality of rf devices to be calibrated are a plurality of rf receivers to be calibrated, and performing channel amplitude calibration on the plurality of rf devices to be calibrated using the reference amplitude information comprises:

5. The method of claim 2, wherein determining the signal amplitude and the signal phase of the first transmit channel of the reference radio frequency transmitter comprises:

acquiring a third digital signal of the first transmission channel;

6. The method according to claim 2 or 5, wherein when the reference rf device is a reference rf transmitter, the plurality of rf devices to be calibrated are a plurality of rf transmitters to be calibrated, and performing channel amplitude calibration on the plurality of rf devices to be calibrated using the reference amplitude information comprises:

7. The method of claim 2, wherein the multi-antenna wireless communication system comprises a plurality of antenna elements, and wherein before the step of determining the reference channel characteristic information of the reference radio frequency device, the method further comprises:

8. A channel synchronization apparatus for a multi-antenna wireless communication system, the apparatus comprising:

9. A communication device comprising a memory and a processor, the memory storing a computer program, wherein the processor when executing the computer program implements the steps of the method for channel synchronization for a multiple antenna based wireless communication system according to any of claims 1 to 7.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for channel synchronization for a multi-antenna based wireless communication system as claimed in any one of claims 1 to 7.