CN101969423A - Method and device for reducing peak factors and remote radio system - Google Patents
Method and device for reducing peak factors and remote radio system Download PDFInfo
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Abstract
The invention discloses a method and a device for reducing peak factors and a remote radio system. The method of the invention comprises the following steps: setting a CFR threshold value and standard values of power amplifier (PA) output parameters; obtaining a time slot signal through a feedback path; calculating actual values of the PA output parameters according to the time slot signal; comparing the actual valves of the PA output parameters and the standard values of the PA output parameters; modifying the CFR threshold value according to the comparison result; and reducing the peak factors of a multi-carrier signal according to the CFR threshold value. The technical scheme of the invention has the advantages that the CFR threshold value is regulated according to the change adaptability of PAR of output power or an intermediate-frequency signal, thus the working state of the PA is regulated in accordance adaptability, thereby enhancing the efficiency and the accuracy of the PA.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to a kind of peak factor and subdue (Crest Factor Reduction, CFR) method, device and radio frequency stretch system.
Background technology
Along with the continuous development of mobile communication technology, the number of users that communication system need be supported increases sharply, and causes that power output and number of carriers also increase thereupon in the communication system, correspondingly, the performance of radio frequency stretch system has been proposed more and more higher requirement.At TD SDMA (Time Division-Synchronous Code Division MultipleAccess, TD-S CDMA) or Long Term Evolution (Long Term Evolution, LTE) in the communication system, intermediate-freuqncy signal is formed by the addition of a plurality of independently baseband signal usually, so peak-to-average force ratio (Peak-to-Average Ratio of the intermediate-freuqncy signal that produces, PAR) big, and meet Gaussian Profile.(Power Amplifier, linear zone PA) is limited to power amplifier in the radio frequency stretch system, so the working range of the PA of the bigger intermediate-freuqncy signal correspondence of PAR is little, thereby reduces the efficient of PA.Therefore, in radio frequency stretch system, need before PA, reduce the PAR of intermediate-freuqncy signal.Fig. 1 is the structural representation of radio frequency stretch system in the prior art.As shown in Figure 1, by digital up converter (Digital Up Converter, DUC), CFR device, digital predistorter (Digital Pre distortion, DPD), digital to analog converter (Digital to Analog Converter, DAC), quadrature modulator, preamplifier and PA form downlink; (Analog toDigital Converter ADC) forms feedback network by attenuator, frequency mixer and analog to digital converter.In existing radio frequency stretch system,, behind DUC, carry out CFR and DPD in order to reduce the PAR of intermediate-freuqncy signal.Descending a plurality of baseband signal, is sent in the predistorter of DPD after the CFR peak clipping by synthetic multi-carrier signal behind the DUC, passes through DAC and quadrature modulator successively through behind the predistorter, delivers to PA again after amplifying.Behind feedback signal process attenuator and the frequency mixer, after the ADC sampling, be sent in the pre-distortion parameters estimator of DPD again, carry out the calculation of parameter of predistortion, the pre-distortion parameters estimator is delivered to predistorter with the parameter that estimates, and input signal is carried out pre-distortion.
The CFR method that present radio frequency stretch system adopts comprises: crest clamp (Clip), peak windowing (Peak Windowing) and crest are subdued (Peak Cancellation).Existing C FR method all needs to set the thresholding of CFR, carries out CFR when PAR surpasses the setting thresholding.This thresholding can influence the output signal of PA, and too low if thresholding is set, the peak that then can cause disappearing is too much, and (Error VectorMagnitude EVM) does not satisfy the requirement of communication system thereby cause the error vector magnitude of the output signal of PA; If it is too high that thresholding is set, the peak that then can cause disappearing is very few, thereby causes PAR excessive, and the efficient of PA is low.
Yet, in present radio frequency stretch system, be the situation of maximum power according to power output usually, the threshold value of pre-configured CFR, and this threshold value immobilizes.Therefore, if power output is different with maximum power, perhaps the PAR of intermediate-freuqncy signal changes, and it is inaccurate then to carry out the result of CFR according to pre-configured threshold value, thereby causes PA can't reach optimum state, and PA efficient is low, error is big.
Summary of the invention
The invention provides a kind of peak factor method for reducing, to improve efficient and the accuracy of PA.
The present invention also provides a kind of peak factor abatement device, to improve efficient and the accuracy of PA.
The present invention also provides a kind of radio frequency stretch system, to improve efficient and the accuracy of PA.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of peak factor and subdue the CFR method, comprising:
The standard value of CFR threshold value and power amplifier PA output parameter is set;
Obtain time slot signal from feedback network;
Calculate the actual value of described PA output parameter according to described time slot signal;
The standard value of the actual value of more described PA output parameter and described PA output parameter is revised described CFR threshold value according to comparative result;
According to described CFR threshold value multi-carrier signal being carried out peak factor subdues.
Describedly according to amended CFR threshold value multi-carrier signal is carried out after peak factor subdues, this method further comprises:
Return the described step of obtaining time slot signal from feedback network.
Described PA output parameter comprises: error vector magnitude EVM;
The standard value of the actual value of described PA output parameter and described PA output parameter, revising described CFR threshold value according to comparative result comprises: whether the actual value of judging EVM is greater than the standard value of EVM, if, increase described CFR threshold value, carry out and describedly multi-carrier signal is carried out the step that peak factor is subdued according to described CFR threshold value, otherwise, directly carry out and describedly multi-carrier signal carried out the step that peak factor is subdued according to described CFR threshold value;
And/or,
Described PA output parameter comprises: adjacent channel leakage compares ACLR;
The standard value of the actual value of described PA output parameter and described PA output parameter, revising described CFR threshold value according to comparative result comprises: whether the actual value of judging ACLR is greater than the standard value of ACLR, if, reduce described CFR threshold value, carry out and describedly multi-carrier signal is carried out the step that peak factor is subdued according to described CFR threshold value, otherwise, directly carry out and describedly multi-carrier signal carried out the step that peak factor is subdued according to described CFR threshold value.
Describedly revise before the described CFR threshold value, also comprise: the modification step-length that the CFR threshold value is set according to comparative result;
The described CFR threshold value of described increase comprises: current C FR threshold value is increased one or more described modification step-lengths;
Describedly reduce described CFR threshold value and comprise: current C FR threshold value is reduced one or more described modification step-lengths.
Described PA output parameter further comprises: the PA power output;
The standard value of described PA output parameter comprises: the standard span of PA power output;
After the described actual value of calculating described PA output parameter according to described time slot signal, this method further comprises:
The actual value of judging the PA power output whether in the standard span of described PA power output, if, carry out and describedly multi-carrier signal carried out the step that peak factor is subdued according to described CFR threshold value, otherwise, initiate the channel failure alarm.
The invention also discloses a kind of peak factor and subdue the CFR device, comprising:
Control and signal processor, be used for obtaining time slot signal from feedback network, calculate the actual value of described PA output parameter according to described time slot signal, the standard value of the actual value of more described PA output parameter and the PA output parameter of presetting, revise default CFR threshold value according to comparative result, the CFR threshold value is set to the CFR controller;
The CFR controller is used for CFR Threshold Control Method CFR attenuator according to described control and signal processor setting and multi-carrier signal is carried out peak factor subdues.
Described PA parameter comprises: error vector magnitude EVM;
Whether described control and signal processing implement body are used to judge the EVM actual value greater than default EVM standard value, if, increase described CFR threshold value, to the CFR controller CFR threshold value is set, otherwise, directly the CFR threshold value is set to the CFR controller.
And/or,
Described PA output parameter comprises: adjacent channel leakage compares ACLR;
Whether described control and signal processing implement body are used to judge the ACLR actual value greater than default ACLR standard value, if, reduce described CFR threshold value, to the CFR controller CFR threshold value is set, otherwise, directly the CFR threshold value is set to the CFR controller.
Described control and signal processor are further used for increasing described CFR threshold value by current C FR threshold value being increased the modification step-length of one or more default CFR threshold values;
And/or,
Described control and signal processor are further used for reducing described CFR threshold value by current C FR threshold value being reduced one or more described modification step-lengths.
Described PA output parameter further comprises: the PA power output;
Described PA output parameter standard value comprises: the standard span of PA power output;
The actual value that described control and signal processor are further used for judging the PA power output whether in the standard span of described PA power output, if, to the CFR controller CFR threshold value is set, otherwise, initiate the channel failure alarm.
The invention also discloses a kind of radio frequency stretch system, comprise as any described peak factor in the claim 6 to 9 and subdue the CFR device.
By above summary of the invention as seen, obtain time slot signal from feedback network, calculate the actual value of PA output parameter according to the time slot signal that obtains, and the standard value of the actual value of more described PA output parameter and described PA output parameter, revise described CFR threshold value according to comparative result, thereby the CFR threshold value carries out accommodation according to the variation of the PAR of power output or intermediate-freuqncy signal, thereby the operating state of PA is carried out accommodation, improved efficient and the accuracy of PA.
Description of drawings
Fig. 1 is the structural representation of radio frequency stretch system in the prior art;
Fig. 2 is the flow chart of the CFR method of the embodiment of the invention one;
Fig. 3 is the flow chart of the CFR method of the embodiment of the invention two;
Fig. 4 is the structural representation of the CFR device of the embodiment of the invention three;
Fig. 5 is the structural representation of the radio frequency stretch system of the embodiment of the invention four.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Basic thought of the present invention is, when carrying out CFR, obtains time slot signal from feedback network, calculates the actual value that obtains the PA output parameter according to this time slot signal, according to this actual value and the standard value that sets in advance the CFR threshold value adjusted in real time.
Fig. 2 is the flow chart of the CFR method of the embodiment of the invention one.As shown in Figure 2, this method comprises following process.
Step 201: the standard value that CFR threshold value and PA output parameter are set.
Step 202: obtain time slot signal from feedback network.
Step 203: the actual value of calculating the PA output parameter according to time slot signal.
Step 204: compare the actual value of PA output parameter and the standard value of PA output parameter, revise described CFR threshold value according to comparative result.
Step 205: according to the CFR threshold value multi-carrier signal is carried out peak factor and subdue.
After step 204, might adjusted CFR threshold value still can not make PA be operated in optimum state, therefore, after step 205, can also return execution in step 202 further, to realize repeatedly iteration adjustment.
Wherein, comprise at least in the PA output parameter that EVM and adjacent channel leakage than one or two in (Adjacent Channel Leakage Ratio is called for short ACLR), can also comprise the PA power output.Below be elaborated by two pairs of CFR methods of the embodiment of the invention, in this embodiment, be example to comprise EVM, ACLR and PA power output in the PA output parameter.
Fig. 3 is the flow chart of the CFR method of the embodiment of the invention two.As shown in Figure 3, this method comprises following process.
Step 301: the standard value that CFR threshold value and PA output parameter are set.
Wherein, comprise EVM and/or ACLR in the PA output parameter at least, can also comprise the PA power output.In the present embodiment, to comprise in the PA output parameter that EVM, ACLR and PA power output are example.Wherein, the standard value of PA power output is the standard span of PA power output.A kind of preferred implementation is that the standard value of EVM is set to 8% or 12.5%.The standard value of ACLR is set to 40dB, or the standard value of ACLR is set to: 44dB under the normal temperature, 43dB under high temperature or the low temperature.
Step 302: obtain time slot signal from feedback network.
In this step, a kind of preferred implementation is, obtains time slot signal from PA feeds back to the feedback signal of DPD.And, feeding back to the time slot signal of catching the signal of DPD from PA is the descending time slot signal, because the EVM of down conversion time slot is the poorest, so a kind of preferred implementation is, the time slot configuration of obtaining time slot signal is become the conversion time slot, can catch time slot signal at the same position in each TD-SCDMA subframe, also can catch the time slot signal of the down conversion time slot of same position every one or more subframes.
Step 303: the actual value of calculating the PA output parameter according to time slot signal.
In this step, the concrete computational methods of PA output parameter are as follows.
EVM is the phasor difference between measured waveform and the desirable modulation waveform, is the error vector average power and the square root of the ratio of reference signal average power, represents with %, measures and is spaced apart a time slot.The size of vector error is called Error Vector Magnitude.With Z (t)=A (t) cos (w
c+ Q (t)) describe a digital modulation signal waveform, wherein A (t) represents the instantaneous amplitude variable, Q (t) expression instantaneous phase variable.Because base band data can be resolved into I vector sum Q vector, by quadrature modulator or directly synthetic mode it is modulated into the carrier angular frequencies of expectation again, with w
cThe expression carrier angular frequencies.So, from the time slot signal that obtains, analyze I, Q base band vector data, thereby can calculate amplitude and phase place that each sends symbol, and then calculate the error vector between tested vector and the most close ideal constellation point.The concrete computing formula of EVM is:
Wherein,
Be the desired locations of I, Q vector,
Be the physical location of I, Q vector, N is the number of data.
ACLR disturbs the index of setting for preventing that transmitter from causing contiguous frequency channel, and it also is an important indicator weighing the transmitter nonlinear distortion level.The TD-SCDMA signal belongs to non-permanent envelope modulation, its formed filter is a root raised cosine filter, rolloff-factor is 0.22, therefore when there is the nonlinear amplitude compression in passage, can produce new frequency spectrum composition in TD-SCDMA signal spectrum both sides, the ACLR index is meant the ratio of the signal that falls into adjacent channel and main channel signal power.According to the time slot signal that obtains, calculate the signal power and the main channel signal power of adjacent channel, both are subtracted each other the value that can obtain ACLR.
The PA power output can obtain by the average power of calculating a time slot, and concrete computing formula is:
Wherein, P
Out_TX_nomThe nominal power rating of the input signal of eating dishes without rice or wine of expression TX path, A
IQ_TX_nomThe base band nominal amplitude value of the input signal of expression TX path correspondence, the TX path is represented downlink, A
IQ_RXBe the IQ range value that calculates, G represents the fixed gain of feedback network.P
Out_TX_nom, A
IQ_TX_nomWith G all are known constants.
Step 304: whether the actual value of judging EVM greater than the standard value of EVM, if, execution in step 305; Otherwise, execution in step 306.
Step 305: increase the CFR threshold value.Execution in step 310 then.
In this step, can adopt the mode of stepping to increase the CFR threshold value.Particularly, can set in advance the modification step-length of CFR threshold value before step 305, then in step 305, the concrete grammar that increases the CFR threshold value is: current C FR threshold value is increased one or more modification step-lengths.
Step 306: whether the actual value of judging ACLR greater than the standard value of ACLR, if, execution in step 307; Otherwise, execution in step 308.
Step 307: reduce described CFR threshold value.Execution in step 310 then.
In this step, can adopt the mode of stepping to reduce the CFR threshold value.Concrete grammar is: current C FR threshold value is reduced one or more modification step-lengths.
Step 308: the actual value of judging the PA power output whether in the standard span of PA power output, if, execution in step 310; Otherwise, execution in step 309.
In this step, whether the actual value by judging the PA power output in the standard span of PA power output, judges whether the down link physical path is normal, if note abnormalities, then execution in step 309 is immediately initiated the channel failure alarm.
Step 309: initiate the channel failure alarm.
Step 310: according to the CFR threshold value multi-carrier signal is carried out peak factor and subdue.
After step 310, can also return execution in step 302 further, to realize repeatedly iteration adjustment.
In the said process of embodiment two, if do not comprise EVM in the PA output parameter, then can not comprise above-mentioned steps 304 and step 305, direct execution in step 306 after step 303.If do not comprise ACLR in the PA output parameter, then can not comprise above-mentioned steps 306 and step 307, in step 304, if the judgment is No, then direct execution in step 308.If do not comprise the PA power output in the PA output parameter, then can not comprise above-mentioned steps 308 and step 309, in step 306, if the judgment is No, then direct execution in step 310.If neither comprise ACLR in the PA output parameter, do not comprise the PA power output yet, then can not comprise above-mentioned steps 306 to step 309, in step 304, if the judgment is No, then direct execution in step 310.
More than the CFR method of the embodiment of the invention is illustrated, by the following examples three and embodiment four respectively CFR device and the radio frequency stretch system that adopts this method described.
Fig. 4 is the structural representation of the CFR device of the embodiment of the invention three.As shown in Figure 4, comprise at least in this device: control and signal processor 41 and CFR attenuator 42.Wherein, comprise CFR controller 421 in the CFR attenuator 42 at least, CFR controller 421 can adopt the register in the CFR attenuator 42, particularly, can be the threshold registers in the CFR attenuator 42.
Wherein, the standard value of PA output parameter is set in control and signal processor 41 in advance, control and signal processor 41 are used for obtaining time slot signal from feedback network, calculate the actual value of described PA output parameter according to time slot signal, the standard value of the PA output parameter that compares the actual value of PA output parameter and preset, revise default CFR threshold value according to comparative result, the CFR threshold value is set to CFR controller 421.
Wherein, the PA parameter can comprise: EVM and/or ACLR.
Whether control and signal processor 41 specifically are used to judge the EVM actual value greater than default EVM standard value, if, increase the CFR threshold value, to CFR controller 421 the CFR threshold value is set; Otherwise, directly the CFR threshold value is set to CFR controller 421.Particularly, the modification step-length of CFR threshold value can be in advance be set in control and signal processor 41, control and signal processor 41 increase the CFR threshold value by current C FR threshold value being increased the modification step-length of one or more default CFR threshold values.
Whether control and signal processor 41 also specifically are used to judge the ACLR actual value greater than default ACLR standard value, if, reduce the CFR threshold value, to CFR controller 421 the CFR threshold value is set; Otherwise, directly the CFR threshold value is set to CFR controller 421.Particularly, the modification step-length of CFR threshold value can be in advance be set in control and signal processor 41, control and signal processor 41 reduce the CFR threshold value by current C FR threshold value being reduced the modification step-length of one or more default CFR threshold values.
The PA output parameter can also comprise: the PA power output.PA power output standard value is the standard span of PA power output.The actual value that control and signal processor 41 are further used for judging the PA power output whether in the standard span of PA power output, if, to CFR controller 421 the CFR threshold value is set, otherwise, initiate the channel failure alarm.
At least comprise CFR controller 421 in the CFR attenuator 42.CFR controller 421 can adopt the register in the CFR attenuator 42, particularly, can be the threshold registers in the CFR attenuator 42.CFR controller 421 is used for carrying out peak factor according to 42 pairs of multi-carrier signals of CFR Threshold Control Method CFR attenuator of controlling and signal processing 41 is provided with and subdues.
Fig. 5 is the structural representation of the radio frequency stretch system of the embodiment of the invention four.As shown in Figure 5, comprise the CFR device of the embodiment of the invention shown in Figure 4 three in this system, specifically comprise control and signal processor 41 and CFR attenuator 42, wherein, comprise CFR controller 421 in the CFR attenuator 42.And control and signal processor 41 can link to each other with DPD, and feedback network sends feedback signal to DPD, obtain time slot signal in control and the feedback signal from feedback network of signal processor 41 from DPD.Particularly, control and signal processor 41 can adopt microprocessor equipment such as (MPU) to realize.The radio frequency stretch system of the embodiment of the invention four comprises: control and signal processor 41, downlink and feedback network, wherein, downlink mainly comprises DUC, CFR controller 42, DPD, DAC, quadrature modulator and the PA that connects successively, wherein, DUC, CFR controller 42 and DPD can realize in a programmable gate array (FPGA); Feedback network mainly comprises controllable attenuator (1/G), low-converter, amplifilter and the ADC that connects successively.Compare with existing radio frequency stretch system, the radio frequency stretch system that example of the present invention provides does not increase new hardware circuit.
By above embodiment as seen, adopt the CFR method of the embodiment of the invention, device and radio frequency stretch system, obtain time slot signal by control and signal processor 41 from feedback network, calculate the actual value of PA output parameter according to the time slot signal that obtains, and the standard value of the actual value of more described PA output parameter and described PA output parameter, revise described CFR threshold value according to comparative result, thereby the CFR threshold value is carried out accommodation according to the variation of the PAR of power output or intermediate-freuqncy signal, thereby adjust the operating state of PA, improved efficient and the accuracy of PA.Further, after once adjusting the CFR threshold value, can also continue to obtain time slot signal, carry out repeatedly iteration adjustment, thereby make PA reach optimum state, further improve efficient and the accuracy of PA from feedback network.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a peak factor is subdued the CFR method, it is characterized in that, comprising:
The standard value of CFR threshold value and power amplifier PA output parameter is set;
Obtain time slot signal from feedback network;
Calculate the actual value of described PA output parameter according to described time slot signal;
The standard value of the actual value of more described PA output parameter and described PA output parameter is revised described CFR threshold value according to comparative result;
According to described CFR threshold value multi-carrier signal being carried out peak factor subdues.
2. method according to claim 1 is characterized in that, describedly according to amended CFR threshold value multi-carrier signal is carried out after peak factor subdues, and this method further comprises:
Return the described step of obtaining time slot signal from feedback network.
3. method according to claim 1 and 2 is characterized in that,
Described PA output parameter comprises: error vector magnitude EVM;
The standard value of the actual value of described PA output parameter and described PA output parameter, revising described CFR threshold value according to comparative result comprises: whether the actual value of judging EVM is greater than the standard value of EVM, if, increase described CFR threshold value, carry out and describedly multi-carrier signal is carried out the step that peak factor is subdued according to described CFR threshold value, otherwise, directly carry out and describedly multi-carrier signal carried out the step that peak factor is subdued according to described CFR threshold value;
And/or,
Described PA output parameter comprises: adjacent channel leakage compares ACLR;
The standard value of the actual value of described PA output parameter and described PA output parameter, revising described CFR threshold value according to comparative result comprises: whether the actual value of judging ACLR is greater than the standard value of ACLR, if, reduce described CFR threshold value, carry out and describedly multi-carrier signal is carried out the step that peak factor is subdued according to described CFR threshold value, otherwise, directly carry out and describedly multi-carrier signal carried out the step that peak factor is subdued according to described CFR threshold value.
4. method according to claim 3 is characterized in that,
Describedly revise before the described CFR threshold value, also comprise: the modification step-length that the CFR threshold value is set according to comparative result;
The described CFR threshold value of described increase comprises: current C FR threshold value is increased one or more described modification step-lengths;
Describedly reduce described CFR threshold value and comprise: current C FR threshold value is reduced one or more described modification step-lengths.
5. according to claim 3 or 4 described methods, it is characterized in that,
Described PA output parameter further comprises: the PA power output;
The standard value of described PA output parameter comprises: the standard span of PA power output;
After the described actual value of calculating described PA output parameter according to described time slot signal, this method further comprises:
The actual value of judging the PA power output whether in the standard span of described PA power output, if, carry out and describedly multi-carrier signal carried out the step that peak factor is subdued according to described CFR threshold value, otherwise, initiate the channel failure alarm.
6. a peak factor is subdued the CFR device, it is characterized in that, comprising:
Control and signal processor, be used for obtaining time slot signal from feedback network, calculate the actual value of described PA output parameter according to described time slot signal, the standard value of the actual value of more described PA output parameter and the PA output parameter of presetting, revise default CFR threshold value according to comparative result, the CFR threshold value is set to the CFR controller;
The CFR attenuator comprises the CFR controller, and described CFR controller is used for according to the described CFR attenuator of the CFR Threshold Control Method of described control and signal processor setting multi-carrier signal being carried out peak factor and subdues.
7. device according to claim 6 is characterized in that,
Described PA parameter comprises: error vector magnitude EVM;
Whether described control and signal processing implement body are used to judge the EVM actual value greater than default EVM standard value, if, increase described CFR threshold value, to the CFR controller CFR threshold value is set, otherwise, directly the CFR threshold value is set to the CFR controller.
And/or,
Described PA output parameter comprises: adjacent channel leakage compares ACLR;
Whether described control and signal processing implement body are used to judge the ACLR actual value greater than default ACLR standard value, if, reduce described CFR threshold value, to the CFR controller CFR threshold value is set, otherwise, directly the CFR threshold value is set to the CFR controller.
8. device according to claim 7 is characterized in that,
Described control and signal processor are further used for increasing described CFR threshold value by current C FR threshold value being increased the modification step-length of one or more default CFR threshold values;
And/or,
Described control and signal processor are further used for reducing described CFR threshold value by current C FR threshold value being reduced one or more described modification step-lengths.
9. according to claim 7 or 8 described devices, it is characterized in that,
Described PA output parameter further comprises: the PA power output;
Described PA output parameter standard value comprises: the standard span of PA power output;
The actual value that described control and signal processor are further used for judging the PA power output whether in the standard span of described PA power output, if, to the CFR controller CFR threshold value is set, otherwise, initiate the channel failure alarm.
10. a radio frequency stretch system is characterized in that, comprises as any described peak factor in the claim 6 to 9 subduing the CFR device.
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