CN102185669A - Method and device for determining state of antenna feed system - Google Patents

Abstract

The invention discloses a method and device for determining a state of an antenna feed system. The method comprises the steps of obtaining a first power of a forward signal and a second power of a reverse signal of a base station port; determining a phase difference between phases of the forward signal and the reverse signal; determining a standing-wave ratio by using the first power, the second power and the phase difference; and determining the state of the antenna feed system by using the standing-wave ratio. According to the invention, the state determining accuracy of the antenna feed system is improved.

Description

The definite method and the device of antenna-feedback system state

Technical field

The present invention relates to the communications field, in particular to a kind of definite method and device of antenna-feedback system state.

Background technology

Emitting radio frequency signal need be come by antenna in the mobile communication base station.Yet when antenna-feedback system (feeder line and antenna) when ging wrong, downstream signal power can not be effectively by aerial radiation to the space.This just needs the base station to have to detect the whether function of operate as normal of antenna-feedback system.At present, the method that usually detects is that the standing wave of base stations detected mouth recently reflects whether operate as normal of antenna-feedback system.

In the correlation technique, the circuit structure of the standing-wave ratio of base stations detected mouth mainly contains following two kinds.

One, obtain the preceding reverse signal of base station mouth indirectly by the coupler between power amplifier and the duplexer, Fig. 1 is being coupled near the base station mouth from duplexer according to correlation technique, the standing-wave ratio testing circuit structural representation of reverse signal before obtaining, as shown in Figure 1, near the coupling of base station mouth, obtain the standing-wave ratio of preceding reverse signal from duplexer.

They are two years old, must arrive near the coupler at mouth place, base station by duplexer and to obtain the preceding reverse signal of base station mouth, Fig. 2 be according to correlation technique from the power amplifier to the duplexer between be coupled, the standing-wave ratio testing circuit structural representation of reverse signal before obtaining, as shown in Figure 2, be coupled the standing-wave ratio of reverse signal before obtaining between from the power amplifier to the duplexer.

If the base station can detect the preceding reverse signal of base station mouth, when calculating standing wave so, as long as the power of reverse signal before knowing.Yet reality is difficult to accomplish the power of the preceding reverse signal of direct base stations detected mouth, has the existence of duplexer adapter between coupler and the base station mouth at least.Because detected signal is not the signal of base station mouth, and detect the method for standing-wave ratio at present, general all amplitudes of a detection signal, this will cause the ratio of precision of the standing-wave ratio of being tried to achieve lower, thus it is inaccurate to cause the antenna-feedback system state to be determined.

The middle inaccurate problem of using of standing-wave ratio of determining at carrying out the antenna-feedback system state in the correlation technique does not propose effective solution at present as yet.

Summary of the invention

Main purpose of the present invention is to provide a kind of definite method and device of standing-wave ratio, and standing-wave ratio accuracy rate that standing-wave ratio in the above-mentioned correlation technique determines that method determines is relatively lower to cause the antenna-feedback system state to determine inaccurate problem to solve at least.

According to an aspect of the present invention, provide a kind of definite method of antenna-feedback system state, having comprised: obtained first power of forward signal of base station mouth and second power of reverse signal; Determine the phase difference value between the phase place of forward signal and reverse signal; Use first power, second power and phase difference value to determine standing-wave ratio; Use standing-wave ratio to determine the antenna-feedback system state.

Further, obtaining first power of forward signal of base station mouth and second power of reverse signal comprises: use the sampled value of analog to digital converter (ADC) to obtain first power and second power.

Further, determine that the phase difference value between the phase place of forward signal and reverse signal comprises: obtain first phase place of forward signal and second phase place of reverse signal by the sampling of ADC; The difference of determining first phase place and second phase place is a phase difference value.

Further, determine that the phase difference value between the phase place of forward signal and reverse signal comprises: obtain first phase difference value between the phase place of the phase place of forward signal and baseband signal; Obtain second phase difference value between the phase place of the phase place of reverse signal and baseband signal; Determine that phase difference value is the difference between first phase difference value and second phase difference value.

Further, use first power, second power and phase difference value to determine that standing-wave ratio comprises: to use following formula to determine standing-wave ratio VSWR:

Wherein, Γ _LBe base station oral reflex coefficient, and

P _FWDBe first power, P _REVBe second power, S is the parameter value of base station mouth equivalent electric circuit,

Be phase difference value,

Angle value for base station mouth equivalent circuit parameter S11.

According to a further aspect in the invention, provide a kind of definite device of antenna-feedback system state, having comprised: first acquisition module is used to obtain first power of forward signal of base station mouth and second power of reverse signal; First determination module is used for determining the phase difference value between the phase place of forward signal and reverse signal; Second determination module is used to use first power, second power, phase difference value to determine standing-wave ratio; The 3rd determination module is used to use standing-wave ratio to determine the antenna-feedback system state.

Further, first acquisition module is used to use the sampled value of analog to digital converter ADC to obtain first power and second power.

Further, first determination module comprises: the 4th determination module is used for obtaining first phase place of forward signal and second phase place of reverse signal by the sampling of ADC; The 5th determination module is used for determining that the difference of first phase place and second phase place is a phase difference value.

Further, first determination module comprises: second acquisition module is used to obtain first phase difference value between the phase place of the phase place of forward signal and baseband signal; The 3rd acquisition module is used to obtain second phase difference value between the phase place of the phase place of reverse signal and baseband signal; The 6th determination module is used for determining that phase difference value is the difference between first phase difference value and second phase difference value.

Further, second determination module, use following formula to determine standing-wave ratio VSWR: Wherein, Γ _LBe base station oral reflex coefficient, and P _FWDBe first power, P _REVBe second power, S is the parameter value of base station mouth equivalent electric circuit,

Be phase difference value,

Angle value for base station mouth equivalent circuit parameter S11.

By the present invention, adopt, solved in the correlation technique that standing-wave ratio accuracy rate that standing-wave ratio in the above-mentioned correlation technique determines that method determines is relatively lower to cause the antenna-feedback system state to determine inaccurate problem, and then reached and improve the effect that the antenna-feedback system state is determined accuracy rate.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 be according to correlation technique from duplexer near the coupling of base station mouth, the standing-wave ratio testing circuit structural representation of reverse signal before obtaining;

Fig. 2 be according to correlation technique from the power amplifier to the duplexer between be coupled the standing-wave ratio testing circuit structural representation of reverse signal before obtaining;

Fig. 3 is the schematic diagram according to the standing-wave ratio testing circuit structure of correlation technique;

Fig. 4 is the equivalent parameters model schematic diagram according to the circuit of correlation technique;

Fig. 5 is according to reverse signal amplitude and phase information before the use of correlation technique, determines the schematic diagram of the amplitude and the angle of end reflection coefficient;

Fig. 6 does not contain phase information according to reverse signal amplitude before the use of correlation technique, determines the schematic diagram of the amplitude of reflection coefficient;

Fig. 7 is the flow chart according to definite method of the antenna-feedback system state of the embodiment of the invention;

Fig. 8 is the flow chart of standing-wave ratio detecting method according to the preferred embodiment of the invention;

Fig. 9 is the structured flowchart according to definite device of the antenna-feedback system state of the embodiment of the invention; And

Figure 10 is the preferred construction block diagram according to definite device of the antenna-feedback system state of the embodiment of the invention.

Embodiment

Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.

Present embodiment provides a kind of definite method of antenna-feedback system state, and Fig. 7 is the flow chart according to definite method of the antenna-feedback system state of the embodiment of the invention, and as shown in Figure 7, this method comprises the steps:

Step S702: obtain first power of forward signal of base station mouth and second power of reverse signal;

Step S704: determine the phase difference value between the phase place of forward signal and reverse signal;

Step S706: use first power, second power and phase difference value to determine standing-wave ratio;

Step S708: use standing-wave ratio to determine the antenna-feedback system state.

Pass through above-mentioned steps, when determining standing-wave ratio, use the phase place of forward signal and reverse signal, the standing-wave ratio of having used when having avoided determining the antenna-feedback system state in the correlation technique is not owing to consider that the influence of phase place causes inaccurate problem, thereby improved the accuracy rate that standing-wave ratio is determined, and then reached the effect that improves the definite accuracy rate of antenna-feedback system state.

Need to prove that standing wave ratio meter is not calculated accurately really in the correlation technique, reason is as follows: circuit structure illustrated in figures 1 and 2, and can replacing with standing-wave ratio testing circuit structure shown in Figure 3.Fig. 4 is the equivalent parameters model schematic diagram according to the circuit of correlation technique, and as shown in Figure 4, the circuit structure of Fig. 3 can obtain the parameter model of Fig. 4, according to the parameter model of Fig. 4, can obtain following relational expression:

${\mathrm{\Γ}}_{\mathrm{IN}}=S_{11}+\frac{S_{21}\×S_{12}\×{\mathrm{\Γ}}_L}{1-S_{22}\×{\mathrm{\Γ}}_L}---\left(1\right)$

Wherein, Γ _LBe base station oral reflex coefficient, Γ _INBe the reflection coefficient of seeing to right-hand member from the radio-frequency module left side.Generally speaking, | S ₂₂* Γ _L|＜＜1 obtains following formula (2) so (1) formula can be simplified,

Can obtain following formula (3) and formula (4) from the parameter module of Fig. 4,

$P_{\mathrm{FWD}}=\frac{{\left|S_{21}\right|}^2}{{|1-S_{22}{\mathrm{\Γ}}_L|}^2}{P}_{\mathrm{FWD}1}---\left(3\right)$

$P_{\mathrm{REV}1}=\frac{{\left|S_{12}\right|}^2}{{|1-S_{11}{\mathrm{\Γ}}_S|}^2}{P}_{\mathrm{REV}}---\left(4\right)$

P wherein _FWDBe base station mouth forward power, P _FWD1Be radio-frequency module left side forward power; P _REVBe base station mouth backward power, P _REV1Be radio-frequency module left side backward power; Γ _sBe source end reflection coefficient.

Consider generally speaking, because | S ₂₂* Γ _L|＜＜1 He | S ₁₁* Γ _S|＜＜1, so above-mentioned formula (3), formula (4) can obtain following formula (5) and formula (6) respectively,

P _FWD≈|S ₂₁| ²P _FWD1 (5)

P _REV1≈|S ₁₂| ²P _REV (6)

According to the definition of standing-wave ratio, following formula (7) is arranged:

${\mathrm{\Γ}}_{\mathrm{IN}}=\frac{V_r}{V_i}=\sqrt{\frac{P_{\mathrm{REV}1}}{P_{\mathrm{FWD}1}}}(\∠V_{\mathrm{REV}1}-\∠V_{\mathrm{FWD}1})---\left(7\right)$

V wherein _iAnd V _rThe incident voltage and the reflected voltage on the difference representation module left side.

By formula (5), formula (6), formula (7), formula (2) can be expressed as following formula (8):

$\begin{array}{c}{\mathrm{\Γ}}_L=\frac{{\mathrm{\Γ}}_{\mathrm{IN}}}{S_{21}\×S_{12}}-\frac{S_{11}}{S_{21}\×S_{12}}\\ =E-S\end{array}---\left(8\right)$

Wherein

By above-mentioned formula, can obtain the following formula of relation (9) of standing-wave ratio and reflection coefficient:

$\mathrm{VSWR}=\frac{1+\left|{\mathrm{\Γ}}_L\right|}{1-\left|{\mathrm{\Γ}}_L\right|}---\left(9\right)$

Calculate Γ as can be seen from formula (8) _LDuring value, need E and S amplitude separately, and the phase difference of E and S

As shown in Figure 5.

Yet, when only calculating Γ with E and S amplitude separately _LThe time, its error that causes will be bigger, particularly works as

=180 when spending, and it is maximum that its error will reach.Try to achieve this moment

Extreme case is worked as down When spending, the maximum relative error Δ | Γ _L| will reach

$\mathrm{\Δ}\left|{\mathrm{\Γ}}_L\right|=\frac{\sqrt{\frac{P_{\mathrm{REV}}}{P_{\mathrm{FWD}}}}+\left|\frac{S_{11}}{S_{21}\×S_{12}}\right|-|\sqrt{\frac{P_{\mathrm{REV}}}{P_{\mathrm{FWD}}}}-|\frac{S_{11}}{S_{21}\×S_{12}}\left|\right|}{\sqrt{\frac{P_{\mathrm{REV}}}{P_{\mathrm{FWD}}}}+\left|\frac{S_{11}}{S_{21}\×S_{12}}\right|}.$

Step S702 has numerous embodiments, as long as can obtain the forward signal of base station mouth and the power of reverse signal, just can realize present embodiment, and a preferred implementation to step S702 describes below.Use the sampled value of analog to digital converter (ADC) to obtain first power and second power.

Step S704 has numerous embodiments, and two preferred implementations to step S704 describe below.

Mode one: obtain first phase place of forward signal and second phase place of reverse signal by the sampling of ADC; The difference of determining first phase place and second phase place is a phase difference value.

Mode two: obtain first phase difference value between the phase place of the phase place of forward signal and baseband signal; Obtain second phase difference value between the phase place of the phase place of reverse signal and baseband signal; Determine that phase difference value is the difference between first phase difference value and second phase difference value.

Need to prove that mode one operation is fairly simple, but in practice, directly obtains first phase place and second phase place, required precision realizes more complicated than higher; Mode two adopts baseband signals as intermediate quantity, obtain both phase difference value, the mode of realization is easy, and the result is accurate.

Preferably, below the preferred implementation of step S706 is described.Use following formula to determine standing-wave ratio VSWR:

Wherein, Γ _LBe base station oral reflex coefficient, and

P _FWDBe first power, P _REVBe second power, S is the parameter value of base station mouth equivalent electric circuit, Be phase difference value,

Angle value for base station mouth equivalent circuit parameter S11.

Embodiment one

Present embodiment provides a kind of base station mouth standing-wave ratio detecting method, and Fig. 8 is the flow chart of standing-wave ratio detecting method according to the preferred embodiment of the invention, and as shown in Figure 8, this method comprises following step S802 to S806.

Step S802: one group of S value of storing corresponding frequency interested in advance.

Step S804: ask the power of FWD and REV and the phase difference of two signals.

Step S806: use triangle formula to try to achieve base station oral reflex coefficient, calculate standing-wave ratio.

By present embodiment, carry out the detection of standing-wave ratio based on the amplitude and the phase information of preceding reverse signal, the amplitude of a detection signal causes standing-wave ratio to detect the bigger problem of error ratio when having solved base stations detected mouth standing-wave ratio in the correlation technique.The characteristics of present embodiment maximum are in conjunction with the amplitude of preceding reverse signal and phase information, thereby obtain the standing-wave ratio of base station mouth.The standing-wave ratio of trying to achieve than traditional method (amplitude information of reverse signal obtains standing-wave ratio by certain data processing then before only detecting) is wanted accurately in this way.In the real system, be difficult to the forward direction at direct base stations detected mouth place and the phase information of reverse signal, ask the phase place and the amplitude information at mouth place, base station, need convert forward direction P to by the module another side _FWD1Power and reverse P _REV1Power and phase place ∠ V _FWD1With ∠ V _REV1Consider the calculating standing-wave ratio, the phase difference of reverse signal gets final product before only need trying to achieve, and sees 8 formulas, rewrites this formula down below.

Wherein, the ∠ representative is angle value.

Wherein

Embodiment two

Present embodiment provides a kind of method of calculating standing-wave ratio, and present embodiment combines the foregoing description and preferred implementation wherein, and this method comprises the steps:

Step 1: at first detect the P among Fig. 3 _FWD1And P _REV1The absolute power level at place, (forward direction FWD calibration process: base station is signal frequently by calibration process then, the data of utilizing ADC the to collect feedback power of negating, simultaneously the base station mouth connects the transmitting power on cause for gossip border, instrument detecting base station, will utilize then gather ADC to the power read of the data corresponding one-tenth of the feedback power instrument of trying to achieve; Reverse REV calibration process: close forward direction FWD power, then from base station mouth input power, can obtain being input to the power of base station mouth by instrument, the data of utilizing ADC to sample are then negated to the power of REV, with the corresponding power that becomes instrument to read of this power.), with the detected preceding reverse signal power P in the module left side _FWD1And P _REV1Correspond to the forward power P at mouth place, base station _FWDWith backward power P _REVIt should be noted that forward power is closed when the calibration backward power; When the calibration forward direction, backward power is closed.See shown in Figure 1.

Step 2: the base station mouth is connect matched load, at this moment, can think Γ _L=0.So can obtain

P _{REV_match}And P _{FWD_match}Power separately obtains by step 1.Try to achieve to while or timesharing ∠ then _{VREV1_match}With ∠ V _{FWD1_match}Phase difference

Be ∠ S ₁₁Asking phase difference simultaneously, is reverse signal before utilizing two-way ADC directly to gather, and obtains the phase difference of two signals then

Phase difference is asked in timesharing, is earlier one of them signal of preceding reverse signal and baseband signal to be compared, and obtains both phase differences Obtain another road signal and baseband signal then and compare, obtain both phase differences

Then reverse angle being deducted forward angle obtains

See shown in Figure 5.So (the S value as 2110MHz～2170MHz) (comprises amplitude can to obtain frequency interested place, base station

With phase information ∠ S ₁₁, promptly above-mentioned S), it is saved as a table about frequent S information interested.

Step 3: base station when work, during base station standing-wave ratio when needing the base stations detected mouth to take over the meaning load, utilize calibration process through step 1, try to achieve the forward power P of base station mouth this moment by reverse signal before the ADC sampling _FWDWith backward power P _REVBe worth, and then try to achieve the phase difference value of preceding reverse signal this moment according to the method for step 2

The E that is above mentioned.

Step 4: after it should be noted that the base station is determined, above-mentioned S parameter is changeless.So access the S value of residing frequency, comprise amplitude and phase information.

Step 5: utilize cosine quantitative, can be in the hope of the end reflection coefficient | Γ _L|, see Fig. 5 (b),

Wherein

Wherein, ∠ S ₁₁What represent is the angle value of S11.

Step 6: use formula (9)

Determine the standing-wave ratio of base station mouth this moment.

Need to prove, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.

The embodiment of the invention provides a kind of definite device of antenna-feedback system state, and this device can be used to realize definite method of above-mentioned antenna-feedback system state.Fig. 9 is that this device comprises according to the structured flowchart of definite device of the antenna-feedback system state of the embodiment of the invention: first acquisition module 92, the first determination modules, 94, the second determination modules 96 and the 3rd determination module 98 is elaborated to said structure below.

First acquisition module 92 is used to obtain first power of forward signal of base station mouth and second power of reverse signal; First determination module 94 is used for determining the phase difference value between the phase place of forward signal and reverse signal; Second determination module 96 is connected to first acquisition module 92 and first determination module 94, and first power and second power, first determination module, the 94 definite phase difference values that are used to use first acquisition module 92 to obtain are determined standing-wave ratio; The 3rd determination module 98 is connected to second determination module 96, and the standing-wave ratio that is used to use second determination module 96 to determine is determined the antenna-feedback system state.

Preferably, first acquisition module 92 is used to use the sampled value of analog to digital converter ADC to obtain first power and second power.

Figure 10 is the preferred construction block diagram according to definite device of the antenna-feedback system state of the embodiment of the invention, and as shown in figure 10, first determination module 94 comprises: the 4th determination module 942, the five determination modules 944; Second acquisition module, 946, the three acquisition modules, 948, the six determination modules 949; Below said structure is elaborated.

Preferably, first determination module 94 comprises: the 4th determination module 942 is used for obtaining first phase place of forward signal and second phase place of reverse signal by the sampling of ADC; The 5th determination module 944 is connected to the 4th determination module 942, is used for determining that first phase place that the 4th determination module 942 obtains and the difference of second phase place are phase difference value.

Preferably, first determination module 94 comprises: second acquisition module 946 is used to obtain first phase difference value between the phase place of the phase place of forward signal and baseband signal; The 3rd acquisition module 948 is used to obtain second phase difference value between the phase place of the phase place of reverse signal and baseband signal; The 6th determination module 949 is connected to second acquisition module 946 and the 3rd acquisition module 948, is used for determining that phase difference value is the difference between second phase difference value that gets access to of first phase difference value that gets access to of second acquisition module 946 and the 3rd acquisition module 948.

Preferably, second determination module 96, use following formula to determine standing-wave ratio VSWR:

Wherein, Γ _LBe base station oral reflex coefficient, and

Be first power, P _REVBe second power, S is the parameter value of base station mouth equivalent electric circuit,

Be phase difference value,

Angle value for base station mouth equivalent circuit parameter S11.

Need to prove that definite device of the antenna-feedback system state of describing among the device embodiment is corresponding to above-mentioned method embodiment, its concrete implementation procedure had been carried out detailed description in method embodiment, do not repeat them here.

Pass through the foregoing description, a kind of definite method and device of antenna-feedback system state are provided, by when determining standing-wave ratio, using the phase place of forward signal and reverse signal, the standing-wave ratio of having used when having avoided determining the antenna-feedback system state in the correlation technique is not owing to consider that the influence of phase place causes inaccurate problem, thereby improved the accuracy rate that standing-wave ratio is determined, and then reached and improve the effect that the antenna-feedback system state is determined accuracy rate.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, carry out by calculation element thereby they can be stored in the storage device, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. definite method of an antenna-feedback system state is characterized in that, comprising:

Obtain first power of forward signal of base station mouth and second power of reverse signal;

Determine the phase difference value between the phase place of described forward signal and described reverse signal;

Use described first power, described second power and described phase difference value to determine standing-wave ratio;

Use described standing-wave ratio to determine the antenna-feedback system state.

2. method according to claim 1 is characterized in that, obtains first power of forward signal of base station mouth and second power of reverse signal and comprises:

Use the sampled value of analog to digital converter ADC to obtain described first power and described second power.

3. method according to claim 1 is characterized in that, determines that the phase difference value between the phase place of described forward signal and described reverse signal comprises:

Obtain first phase place of described forward signal and second phase place of described reverse signal by the sampling of ADC;

The difference of determining described first phase place and described second phase place is described phase difference value.

4. method according to claim 1 is characterized in that, determines that the phase difference value between the phase place of described forward signal and described reverse signal comprises:

Obtain first phase difference value between the phase place of the phase place of described forward signal and baseband signal;

Obtain second phase difference value between the phase place of the phase place of described reverse signal and described baseband signal;

Determine that described phase difference value is the difference between described first phase difference value and described second phase difference value.

5. according to each described method in the claim 1 to 4, it is characterized in that, use described first power, described second power and described phase difference value to determine that standing-wave ratio comprises:

Use following formula to determine described standing-wave ratio VSWR:

Wherein, Γ _LBe base station oral reflex coefficient, and PFWD is described first power, P _REVBe described second power, S is the parameter value of base station mouth equivalent electric circuit,

Be described phase difference value, Angle value for base station mouth equivalent circuit parameter S11.

6. definite device of an antenna-feedback system state is characterized in that, comprising:

First acquisition module is used to obtain first power of forward signal of base station mouth and second power of reverse signal;

First determination module is used for determining the phase difference value between the phase place of described forward signal and described reverse signal;

Second determination module is used to use described first power, described second power, described phase difference value to determine standing-wave ratio;

The 3rd determination module is used to use described standing-wave ratio to determine the antenna-feedback system state.

7. device according to claim 6 is characterized in that,

Described first acquisition module is used to use the sampled value of analog to digital converter ADC to obtain described first power and described second power.

8. device according to claim 6 is characterized in that, described first determination module comprises:

The 4th determination module is used for obtaining first phase place of described forward signal and second phase place of described reverse signal by the sampling of ADC;

The 5th determination module is used for determining that the difference of described first phase place and described second phase place is described phase difference value.

9. device according to claim 6 is characterized in that, described first determination module comprises:

Second acquisition module is used to obtain first phase difference value between the phase place of the phase place of described forward signal and baseband signal;

The 3rd acquisition module is used to obtain second phase difference value between the phase place of the phase place of described reverse signal and described baseband signal;

The 6th determination module is used for determining that described phase difference value is the difference between described first phase difference value and described second phase difference value.

10. according to each described device in the claim 6 to 9, it is characterized in that,

Described second determination module, use following formula to determine described standing-wave ratio VSWR:

Wherein, Γ _LBe base station oral reflex coefficient, and

P _FWDBe described first power, P _REVBe described second power, S is the parameter value of base station mouth equivalent electric circuit,

Be described phase difference value, Angle value for base station mouth equivalent circuit parameter S11.

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