JP2022538665A - Base station multi-channel phase synchronization device, method and base station - Google Patents

Abstract

This disclosure proposed a base station multi-channel phase synchronization device, method and base station. A base station multi-channel phase synchroniser according to the present disclosure includes multiple channels, a clock circuit and a calibration circuit. Each channel is provided with a local oscillation circuit for generating a local oscillation signal, and a clock circuit is connected to each channel so as to provide a clock signal to each channel. A calibration circuit is configured to obtain a phase difference of each channel with respect to a reference channel and perform phase calibration for each channel based on the phase difference. According to the base station multi-channel phase synchronization device according to the present disclosure, each channel is provided with a local oscillator independently, and all channels share one synchronization clock.
[Selection drawing] Fig. 3

Description

TECHNICAL FIELD The present disclosure relates to the field of communication technology, and more particularly to a base station multi-channel phase synchronization device, method and base station.

The latest communication technology puts higher demands on signal phase control, Massive multiple-input multiple-output (abbreviated as MIMO), beamforming technology, both the phase and It requires that the amplitude can be precisely controlled.

In order to maintain phase synchronization between channels, most base stations adopt a common local oscillation scheme in related art. However, with the continuous increase in the number of system array units and the number of channels, the common local oscillation method makes it difficult to design the distribution and wiring of the local oscillation, and the PCB area is occupied, resulting in an increase in the overall volume of the equipment. Invite.

The technical problem to be solved by the present disclosure is to solve the base station multi-channel phase synchronization problem, and the present disclosure provides a base station multi-channel phase synchronization device, method and base station.

A base station multi-channel phase synchronization apparatus according to an embodiment of the present disclosure provides a plurality of channels, each of which is provided with a local oscillator circuit for generating a local oscillator signal, and a clock signal to each said channel. and a clock circuit configured to obtain a phase difference of each channel with respect to a reference channel and perform phase calibration for each of the channels based on the phase difference. and a calibration circuit.

According to the base station multi-channel phase synchronization apparatus according to the embodiment of the present disclosure, each channel is independently installed with a local oscillator circuit, and all channels share one synchronization clock. A common clock reference thereby achieves some degree of synchronization of each channel phase. And the wiring of the system can be made more convenient and flexible. In addition, since the frequency of the clock signal is relatively low and the insertion loss is small, there is no need to install an amplifier, and there is no need to consider excessive spurious effects, effectively simplifying the overall structure of the base station, And the problem of base station multi-channel phase synchronization is solved. Also, by performing real-time phase calibration for each channel, it is possible to ensure that the performance of phase synchronization is not affected after hardware simplification.

According to the base station multi-channel phase synchronization method according to an embodiment of the present disclosure, the base station multi-channel phase synchronization method employs the base station multi-channel phase synchronization device described above to perform multi-channel phase synchronization, and the The method includes obtaining a phase difference of each channel of a base station with respect to a reference channel, and performing phase calibration for each said channel based on said phase difference.

According to the base station multi-channel phase synchronization method of the present disclosure, each channel is independently installed with a local oscillator circuit, and all channels share one synchronization clock. A common clock reference thereby achieves some degree of synchronization of each channel phase. It makes the wiring of the system more convenient and flexible. In addition, since the frequency of the clock signal is relatively low and the insertion loss is small, there is no need to install an amplifier, and there is no need to consider excessive spurious effects, effectively simplifying the overall structure of the base station, And the problem of base station multi-channel phase synchronization is solved. Also, by performing real-time phase calibration for each channel, it is possible to ensure that the performance of phase synchronization is not affected after hardware simplification.

A base station according to embodiments of the present disclosure includes a multi-channel phase synchronizer that is the base station multi-channel phase synchronizer described above.

According to the base station according to the embodiment of the present disclosure, each channel is independently provided with a local oscillation circuit, and each channel shares one synchronous clock.

1 is a system schematic diagram of a common local oscillation scheme in related art; FIG. 1 is a system phase difference analysis diagram of a common local oscillation scheme in related art; FIG. 1 is a system schematic diagram of a common clock scheme according to an embodiment of the present disclosure; FIG. FIG. 4 is a common clock system phase difference analysis diagram according to an embodiment of the present disclosure; 4 is a flow chart of a base station multi-channel phase synchronization method according to an embodiment of the present disclosure; 4 is a flow chart of a method for obtaining a phase difference of each channel of a base station with respect to a reference channel according to an embodiment of the present disclosure; 4 is a flow chart of a base station multi-channel phase synchronization method according to an embodiment of the present disclosure; 4 is a flow chart of a base station multi-channel phase synchronization method according to an embodiment of the present disclosure; 1 is a schematic diagram of an example of a system for reference in related art; FIG. FIG. 4 is a schematic diagram of an example of a common clock reference according to an embodiment of the disclosure;

In order to further describe the technical means and effects adopted by the present disclosure to achieve certain objectives, the present disclosure will be described in detail as follows in conjunction with the accompanying drawings and preferred embodiments.

In the related art, most base stations adopt common local oscillation schemes to maintain phase synchronization between each channel of the base stations, as shown in FIG. A base station system in the common local oscillation system is composed of the same clock generator 122 , PLL (local oscillator) 101 , local oscillation distributor 102 and amplifier circuits 103 , 109 and 114 .

The greatest feature of the common local oscillation system is that the local oscillation signals of all transmission and reception channels of the entire device come from the same local oscillator 101, so that the phases arriving at each channel frequency mixer are the same. , and that the emission phases of the N channels TX1-N are the same as long as the baseband signal phases match.

The common local oscillator method requires calibration, because differences in the wiring and terminals of the printed circuit board (abbreviated as PCB) of each channel of the local oscillator distributor introduce a fixed phase difference. and need to be compensated at baseband after calibration. Since the change in the phase difference of the common local oscillation system over time is extremely small, calibration of the common local oscillation is simple, and calibration can be performed every few hours after the initialization calibration.

As shown in FIG. 1, when adopting the common local oscillation method, the same PLL (local oscillator) must provide the local oscillation signals for the N-channel transmission and reception links. When distributing and reaching the channel, the level drops, plus the frequency of the local oscillator signal is high, the PCB loss is large, the need for more amplifier circuits, etc., thus adding more chip area to the system. It needs to be increased, and power consumption and cost also increase. At the same time, the frequency of the local oscillation signal is relatively high, and the local oscillation distribution wiring is easy to introduce spurious into the system, bringing uncertain risks to the system. With the ever-increasing number of system array units and the increasing number of channels, the local oscillator distribution and wiring problems and area contradictions for the entire 64-channel or 128-channel equipment are almost intractable.

As shown in FIG. 3, a base station multi-channel phase synchronizer according to an embodiment of the present disclosure includes multiple channels, clock circuitry and calibration circuitry.

Specifically, as shown in FIG. 3, the base station has a plurality of channels, and each channel is provided with a local oscillation circuit for generating a local oscillation signal. A clock circuit is both connected to each channel to provide a clock signal to each channel. A calibration circuit is configured to obtain a phase difference of each channel with respect to a reference channel and perform phase calibration for each channel based on the phase difference.

According to the base station multi-channel phase synchronization apparatus according to the embodiment of the present disclosure, each channel is independently installed with a local oscillator circuit, and all channels share one synchronization clock. A common clock reference then provides some degree of synchronization of each channel phase. It makes the wiring of the system more convenient and flexible. In addition, since the frequency of the clock signal is relatively low and the insertion loss is small, there is no need to install an amplifier, and there is no need to consider excessive spurious effects, effectively simplifying the overall structure of the base station, And the problem of base station multi-channel phase synchronization is solved. Also, by performing real-time phase calibration for each channel, it is possible to ensure that the performance of phase synchronization is not affected after hardware simplification.

According to some embodiments of the present disclosure, a calibration circuit includes an acquisition module and a calibration module.

Wherein, the acquisition module is configured to acquire the phase difference of each channel of the base station with respect to the reference channel.

A calibration module is configured to perform a phase calibration for each channel based on the phase difference.

In the present disclosure, each channel is provided with an independent local oscillation circuit, and each channel shares the same clock circuit, and the present disclosure is defined as a common clock reference method.

As shown in FIG. 6, according to some embodiments of the present disclosure, the acquisition module specifically:
firing a calibration signal on each channel,
It is configured to select one of the plurality of channels as a reference channel and to calculate phase differences of the remaining channels with respect to the reference channel based on the calibration signal.

As shown in FIG. 3, the digital baseband processing unit 208 can send one special calibration signal to each channel, and the calibration signals pass from the calibration channel 226 to the digital baseband processing unit 208 via each channel. back to One channel is selected as a reference channel from a plurality of channels, the reference channel is used as a reference, and phase differences of the remaining channels with respect to the reference channel are calculated.

The digital baseband processing unit 208 can then perform phase compensation for each channel based on the phase difference to align the phases of all channels with the reference channel.

In some embodiments of the present disclosure, the phase difference may include local oscillator phase difference and wiring phase difference for each channel.

Wherein, the local oscillator phase difference may include a voltage controlled oscillator phase difference, a frequency divider phase difference and a phase detector phase difference, and the wiring phase difference may include a local oscillator wiring phase difference and a clock wiring phase difference.

As shown in FIG. 4, the PLL (Local Oscillator) can introduce phase noise, which is present in the VCO (Voltage Controlled Oscillator), frequency divider and phase detector. These noise components cause the phase of the PLL (local oscillator) to shift from the phase of the reference clock. Therefore, different PLL output phases may have a phase variation Δpll. The wiring from the clock circuit (CLK) to the PLL may introduce Δclkpath, and the local oscillator circuit wiring may introduce ΔLO_path. That is, in the common reference scheme employed in this disclosure, phase variations include Δpll, Δclkpath and ΔLO_path. Among them, Δclkpath and ΔLO_path belong to the phase difference introduced by the wiring. As can be seen from the experiment, the length, thickness, material and bending angle of the PCB wiring can all introduce the phase difference. , the rotating joint, length, and material of the coaxial cable can also introduce phase differences.

By calculating the phase difference of each channel with respect to the reference channel, phase compensation can be performed for each channel based on the phase difference to align all channel phases with the reference channel.

In some embodiments of the present disclosure, the apparatus further includes a determination module, the determination module:
Determining whether the preset phase calibration conditions are satisfied,
The acquisition module is configured to trigger acquisition of the phase difference of each channel of the base station with respect to the reference channel if a preset phase calibration condition is met.

According to some embodiments of the present disclosure, the preset phase calibration condition is that the system temperature change of the base station exceeds a preset temperature and/or reaches a preset calibration time. is.

That is, when the system temperature change of the base station exceeds a preset temperature, perform phase calibration compensation for each channel, or when the time interval from the previous calibration compensation reaches a preset calibration time, perform phase calibration compensation for each channel, or when the system temperature change of the base station exceeds a preset temperature and the time interval between the previous calibration compensation reaches a preset calibration time, each channel perform phase calibration compensation for

Note that, as mentioned above, in the common clock reference scheme employed in this disclosure, phase variations include Δpll, Δclkpath and ΔLO_path. Although these phase differences are constant, temperature changes can cause the phase differences to fluctuate. Therefore, the entire instrument in the common reference scheme will have the phases of each channel already aligned after calibration, but will vary with temperature. is relatively large, the phase difference change due to Δclkpath and ΔLO_path is too large, causing the phase difference between each channel to exceed reasonable requirements, which may affect traffic. Therefore, in the design of the entire device, it is necessary to control the PCB wiring so that Δclkpath and ΔLO_path are as small as possible, but due to the complexity of the system, it is impossible to completely eliminate Δclkpath and ΔLO_path, Calibration compensation needs to be done. The phase difference Δpll due to the PLL also changes from time to time with time and temperature and also needs to be compensated for by calibration.

According to some embodiments of the present disclosure, the length of the local oscillator wiring of the local oscillator circuit in each channel is the same. By configuring the local oscillation wiring of the local oscillation circuit in each channel to have the same length of local oscillation wiring, it is possible to reduce the phase variation Δpll that exists in different PLL output phases in each channel, thereby It helps to improve the phase matching of the

In some embodiments of the present disclosure, the length of the clock wire that the clock circuit connects to each said channel is the same. By arranging the clock circuit so that the length of the clock wires connecting to each said channel is the same, the clock wire phase difference Δclkpath introduced by the wires from the clock circuit (CLK) to the PLL can be reduced. , thereby helping to improve the phase matching of each channel.

As shown in FIGS. 3 and 5, according to the base station multi-channel phase synchronization method according to the present disclosure, the base station multi-channel phase synchronization method employs the base station multi-channel phase synchronization apparatus described above to Performing channel phase synchronization, the method includes the following steps.

S101: Obtain the phase difference of each channel of the base station with respect to the reference channel.

S102: Perform phase calibration for each channel based on the phase difference.

According to the base station multi-channel phase synchronization method of the present disclosure, each channel is independently installed with a local oscillator circuit, and all channels share one synchronization clock. A common clock reference then provides some degree of synchronization of each channel phase. It makes the wiring of the system more convenient and flexible. In addition, since the frequency of the clock signal is relatively low and the insertion loss is small, there is no need to install an amplifier, and there is no need to consider excessive spurious effects, effectively simplifying the overall structure of the base station, And the problem of base station multi-channel phase synchronization is solved. Also, by performing real-time phase calibration for each channel, it is possible to ensure that the performance of phase synchronization is not affected after hardware simplification.

As shown in FIG. 6, according to some embodiments of the present disclosure, obtaining the phase difference of each channel of a base station with respect to a reference channel includes the following steps.

S201: Launch a calibration signal on each channel.

As shown in FIG. 3, the digital baseband processing unit 208 can send one special calibration signal to each channel, and the calibration signals pass from the calibration channel 226 to the digital baseband processing unit 208 via each channel. back to

S202: Select one of the plurality of channels as a reference channel, and calculate the phase difference of the remaining channels with respect to the reference channel based on the calibration signal.

As shown in FIG. 3, one channel is selected as a reference channel from a plurality of channels, the reference channel is used as a reference, and the phase differences of the remaining channels with respect to the reference channel are calculated.

The digital baseband processing unit 208 can then perform phase compensation for each channel based on the phase difference to align the phases of all channels with the reference channel.

In some embodiments of the present disclosure, the phase difference may include local oscillator phase difference and wiring phase difference for each channel.

Wherein, the local oscillator phase difference may include a voltage controlled oscillator phase difference, a frequency divider phase difference and a phase detector phase difference, and the wiring phase difference may include a local oscillator wiring phase difference and a clock wiring phase difference.

As shown in FIG. 2, in the common local oscillation system adopted in the related art, wiring differences from the PLL (local oscillator) to the frequency mixer may introduce a phase variation ΔLO_path. As can be seen, the phase fluctuation in the common local oscillation system is only ΔLO_path introduced by the local oscillation circuit wiring, and this is because the conventional system has reduced the factors that affect the phase due to the complicated local oscillation system. is.

In the common clock scheme employed in this disclosure, as shown in FIG. 4, the PLL (local oscillator) can introduce phase noise, which can be introduced by the VCO (voltage controlled oscillator), the frequency divider and in the phase detector. These noise components cause the phase of the PLL (local oscillator) to shift from the phase of the reference clock. Therefore, different PLL output phases may have a phase variation Δpll. The wiring from the clock circuit (CLK) to the PLL may introduce Δclkpath, and the local oscillator circuit wiring may introduce ΔLO_path. That is, in the common reference scheme employed in this disclosure, phase variations include Δpll, Δclkpath and ΔLO_path. Among them, Δclkpath and ΔLO_path belong to the phase difference introduced by the wiring. As can be seen from the experiment, the length, thickness, material and bending angle of the PCB wiring can all introduce the phase difference. , the rotating joint, length, and material of the coaxial cable can also introduce phase differences.

By calculating the phase difference of each channel with respect to the reference channel, phase compensation can be performed for each channel based on the phase difference to align all channel phases with the reference channel.

As shown in FIG. 7, in some embodiments of the present disclosure, the method further includes the following steps.

S301: Judge whether or not a preset phase calibration condition is satisfied.

S302: Obtain the phase difference of each channel of the base station with respect to the reference channel if a preset phase calibration condition is satisfied.

According to some embodiments of the present disclosure, the preset phase calibration condition is that the system temperature change of the base station exceeds a preset temperature and/or reaches a preset calibration time. is.

That is, when the system temperature change of the base station exceeds a preset temperature, perform phase calibration compensation for each channel, or when the time interval from the previous calibration compensation reaches a preset calibration time, perform phase calibration compensation for each channel, or when the system temperature change of the base station exceeds a preset temperature and the time interval between the previous calibration compensation reaches a preset calibration time, each channel perform phase calibration compensation for

Note that, as mentioned above, in the common clock reference scheme employed in this disclosure, phase variations include Δpll, Δclkpath and ΔLO_path. Although these phase differences are constant, temperature changes can cause the phase differences to fluctuate. Therefore, the entire instrument in the common reference scheme will have the phases of each channel already aligned after calibration, but will vary with temperature. is relatively large, the phase difference change due to Δclkpath and ΔLO_path is too large, causing the phase difference between each channel to exceed reasonable requirements, which may affect traffic. Therefore, in the design of the entire device, it is necessary to control the PCB wiring so that Δclkpath and ΔLO_path are as small as possible, but due to the complexity of the system, it is impossible to completely eliminate Δclkpath and ΔLO_path, Calibration compensation needs to be done. The phase difference Δpll due to the PLL also changes from time to time with time and temperature and also needs to be compensated for by calibration.

As shown in FIG. 8, the factors that trigger calibration compensation for each channel are time and temperature. Phase calibration compensation is initiated when the temperature change across the instrument exceeds a certain range or after a certain amount of time. Following the phase error requirement issued by the operator within 5°, the calibration trigger condition can be set to a temperature change of more than 10°C across the equipment and a time change of 30 minutes. As shown in FIG. 8, an initialization calibration is first performed after powering on the system. While the base station is running, the system CPU reads back the temperature of the entire device and performs a one-time phase calibration if the temperature changes more than 10°C. Along with that, the system performs one phase calibration when 30 minutes have passed since the last phase calibration. Thereby, it is possible to ensure that services such as base station system traffic of the common reference scheme are normal.

As shown in FIGS. 3 and 4, the signal is coupled from the antenna port, into the N-channel combiner, through the calibration channel into the baseband, and the digital baseband processing unit 208 outputs the N-channel reference signal. Calculate the phase difference ΔPhaseN for the channel and perform phase compensation ΔCalN on the baseband signal. The phase difference between the compensated N channel and the reference channel is set to 0, and
ΔPhaseN=Δpll+Δclkpath+ΔLO_path;
ΔPhaseN + ΔCalN = 0.

The common clock reference scheme of the present disclosure can meet the requirements for massive and beamforming phases in 5G base stations, with more flexible layout, smaller volume, and reduced cost, power consumption. and can be applied to multi-channel (64 or 128) beamforming.

FIG. 10 shows a specific example of the circuitry of the transmission/reception system of the entire device in the common clock reference method. In addition, for comparison, FIG. 9 shows a specific example of a circuit of a transmitting/receiving system for the entire device in the N-channel common local oscillation system (related technology system). In FIG. 10, the system uses a 2T2R transceiver integrated chip, with a total of N emission channels and N reception channels. The same clock chip provides the reference for N/2 integrated chips and the two channels on each integrated chip are common local oscillators. One of the N receive channels is selected as the launch phase calibration channel (thus the number of simulated channels can be saved), and the N channels enter the calibration channel through a combiner (calibrate N channels simultaneously). can be used, thus improving the calibration efficiency), thus completing the launch calibration. Selecting one launch channel as the receive phase calibration channel and assigning a calibration channel to each receive channel through a combiner completes the calibration of the receive channels. Single-board wiring for the entire device requires that clock wiring, radio frequency wiring, and cable lengths be matched as much as possible.

As can be seen from the comparison of the specific examples of FIGS. 9 and 10,
The common reference scheme employed in the present disclosure has lower system risks, less spurious, smaller chip count, cost, power consumption, and area than common local oscillator schemes employed in related art, and , at least one PLL chip, N-channel amplifiers and N/4 power dividers can be saved. It also reduces waste to the internal PLL of the transceiver and radio frequency sampling chip.

Both the common reference method adopted in the present application and the common local oscillation method adopted in related technologies place demands on wiring, and the common reference method increases the difficulty of clock wiring. However, the common local oscillation system increases the complexity of the local oscillation wiring. Overall, the common reference wiring requirements are low because the local oscillator signal has a higher frequency than the clock signal.

As shown in FIG. 3, a base station according to embodiments of the present disclosure includes a multi-channel phase synchronizer, which is the base station multi-channel phase synchronizer described above.

Among them, each channel is provided with a local oscillation circuit for generating a local oscillation signal. A clock circuit is both connected to each channel to provide a clock signal to each channel. A calibration circuit is used to obtain the phase difference of each channel with respect to the reference channel and perform phase calibration for each channel based on the phase difference.

Specifically, as shown in FIG. 3, the common clock reference base station employed in the present disclosure consists of three parts: clock generation and distribution circuitry, transmit and receive circuitry, and system phase calibration.

Among them, as shown in FIG. 3, the clock generation and distribution circuit mainly includes a clock generator 224, a clock distributor 225, and wires 204, 211, 219 from the clock chip to each channel. The main function of the circuit is to distribute the recovered clock to each channel after spurious filtering. As long as the phase delays at 204, 211, 219 are matched, it can be ensured that the phases of the clocks arriving at each channel local oscillator are matched.

The transmit and receive circuitry includes each channel frequency synthesizer 201, 209, 216, local oscillator wiring 205, 212, 220 and other devices in the radio frequency transmit and receive link. The frequency synthesizers 1 to 3 generate a local oscillator LO signal using the clock signal as a reference, mix it with the baseband signal, and then transmit it via a radio frequency link. In an ideal state, if the phase of the local oscillation signal matches the reference, and if the phase delay between the wiring and other devices matches, the phase of each channel to the antenna is the same.

According to the base station according to the embodiments of the present disclosure, the local oscillator circuits of each channel are relatively independent, and all channels share one synchronous clock. It makes the wiring of the system more convenient and flexible. And since the frequency of the clock signal is relatively low and the insertion loss is small, there is no need to install an amplifier, there is no need to consider the spurious effect excessively, and the problem of base station multi-channel phase synchronization can be effectively solved. It can solve and meet the requirement for massive and beamforming phase in 5G base station, and can be applied to multi-channel (64 or 128) beamforming.

Through the description of the mode for carrying out the invention, it should be possible to understand more deeply and specifically the technical means and effects adopted by the present disclosure to achieve the intended purpose. , are provided for reference and explanation only, and are not intended to limit the disclosure.

Claims (16)

A base station multi-channel phase synchronizer comprising:
a plurality of channels each provided with a local oscillation circuit for generating a local oscillation signal;
a clock circuit both connected to each said channel to provide a clock signal to each said channel;
a calibration circuit configured to obtain a phase difference of each channel with respect to a reference channel and perform phase calibration for each said channel based on said phase difference. The calibration circuit comprises:
an acquisition module configured to acquire a phase difference of each channel of a base station with respect to a reference channel;
and a calibration module configured to perform phase calibration for each said channel based on said phase difference. The acquisition module is
firing a calibration signal on each said channel;
3. The method of claim 2, configured to select one of a plurality of said channels as a reference channel and, based on said calibration signal, to calculate phase differences of said remaining channels with respect to said reference channel. Base station multi-channel phase synchronizer. 3. The base station multi-channel phase synchronization apparatus according to claim 2, wherein said phase difference includes local oscillation phase difference and wiring phase difference of each said channel. 5. The method of claim 4, wherein the local oscillator phase difference comprises a voltage controlled oscillator phase difference, a frequency divider phase difference and a phase detector phase difference, and wherein the wire phase difference comprises a local oscillator wire phase difference and a clock wire phase difference. A base station multi-channel phase synchronizer as described. The apparatus further includes a determination module, the determination module:
Determining whether the preset phase calibration conditions are satisfied,
3. The base station multi-channel phase of claim 2, configured to trigger acquisition by the acquisition module of the phase difference of each channel of the base station with respect to a reference channel if the preset phase calibration condition is met. Synchronizer. The preset phase calibration condition is
system temperature change of the base station exceeds a preset temperature; and/or
7. The base station multi-channel phase synchroniser according to claim 6, wherein reaching a preset calibration time. 2. The base station multi-channel phase synchronization apparatus according to claim 1, wherein the length of the local oscillation wiring of the local oscillation circuit in each said channel is the same. 2. The base station multi-channel phase synchroniser of claim 1, wherein the length of the clock wire through which said clock circuit is connected to each said channel is the same. A base station multi-channel phase synchronization method for performing multi-channel phase synchronization by employing the base station multi-channel phase synchronization device according to any one of claims 1 to 9,
obtaining a phase difference of each channel of the base station with respect to a reference channel;
performing phase calibration for each said channel based on said phase difference. Obtaining the phase difference of each channel of the base station with respect to the reference channel as described above is
firing a calibration signal on each said channel;
11. The base of claim 10, comprising selecting one of a plurality of said channels as a reference channel and calculating phase differences of said remaining channels with respect to said reference channel based on said calibration signal. Station multi-channel phase synchronization method. 12. The base station multi-channel phase synchronization method according to claim 11, wherein said phase difference comprises local oscillator phase difference and wiring phase difference of each said channel. 13. The method of claim 12, wherein the local oscillator phase difference comprises a voltage controlled oscillator phase difference, a frequency divider phase difference and a phase detector phase difference, and wherein the wire phase difference comprises a local oscillator wire phase difference and a clock wire phase difference. A base station multi-channel phase synchronization method as described. The method includes
determining whether a preset phase calibration condition is met;
11. The base station multi-channel phase synchronization method of claim 10, further comprising obtaining a phase difference of each channel of a base station with respect to a reference channel if the preset phase calibration condition is met. The preset phase calibration condition is
system temperature change of the base station exceeds a preset temperature; and/or
15. The base station multi-channel phase synchronization method of claim 14, wherein reaching a preset calibration time. A base station comprising a multi-channel phase synchroniser, which is a base station multi-channel phase synchroniser according to any one of claims 1 to 9.

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