CN103517296A - Frequency point switching detection method, frequency point switching detection equipment and frequency point switching detection system - Google Patents
Frequency point switching detection method, frequency point switching detection equipment and frequency point switching detection system Download PDFInfo
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Abstract
The invention discloses a frequency point switching detection method, a piece of frequency point switching detection equipment and a frequency point switching detection system. The frequency point switching detection method comprises the steps of determining a first central frequency point of a signal in the time period when each set time period is up, figuring out the difference between the first central frequency point and a second central frequency point which corresponds to a predetermined fixed number of frequency points of the signal, and determining that the frequency points of the signal are switched when the absolute value of the obtained difference value is not smaller than a set value. By quickly determining whether the frequency points of the signal are offset through the offset of the frequency points of the signal and especially by determining whether the frequency points are switched in a frequency hopping application environment, the problem that the frequency points of the signal are offset greatly to cause poor dynamical pre-distortion adjustment performance is avoided, the dynamical pre-distortion adjustment performance is improved, and the quality of signals is improved.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of frequency switching detection method, equipment and system.
Background technology
In mobile communication system, in order to guarantee that the signal of certain limit covers, and uses power amplifier (that is: power amplifier) to amplify to the received signal processing conventionally.Because power amplifier self has non-linearly, can make the video stretching of the signal after amplifying, this has just caused distortion and monkey chatter in the band of signal.The method of traditional solution power amplifier linearization is to make power amplifier be operated in the limited range of linearity by back-off signal power, avoids the nonlinear problem of power amplifier.
Yet in existing communication system, adopt multicarrier, broadband technology, make the peak-to-average force ratio of signal very high, thereby make to be subject to the distortion that power amplifier non-linear effects brings and disturb more obvious.Particularly, when the peak-to-average force ratio of signal increases, the power fluctuation scope of signal will increase thereupon, and the nonlinear distortion seriousness of power amplifier is increased, and therefore, the nonlinear distortion question of communication system intermediate power amplifier more and more receives people's concern.
Obviously, processing have higher peak all than modulation signal time, still adopt the method for rollback power to avoid the nonlinear words of power amplifier, in order to reach specified power output, need to select the amplifier of super high power, not only pay the hardware cost of great number, and the efficiency of power amplifier and the linearity cannot be taken into account.
Therefore, under the exigent situation of linearity, power amplifier cannot meet reality needs by back-off completely, and the nonlinear problem that adopts digital pre-distortion technology to solve power amplifier is vital.
Yet in digital high-frequency amplification station field, signal is received repeater by radio-frequency head, there is change in the applied environment of signal, often there will be signal to jump to high frequency points or from high frequency points, jump to the switching situation of low frequency from low frequency; Again because different frequencies gains and has certain difference in different systems, when the frequency of signal changes, the digital pre-distortion coefficient matching with current demand signal frequency that signal calculates when switching, at signal frequency point, switch and when system gain changes, the digital pre-distortion coefficient matching with current demand signal frequency calculating when switching can not meet the frequency requirement after switching, make the linearisation weak effect of power amplifier, even can cause intermodulation deterioration, the end to make an uproar and lift, and then affect the dynamic property of digital pre-distortion technology.
Summary of the invention
The embodiment of the present invention provides a kind of frequency switching detection method, equipment and system, for solving, determines how exactly the problem that signal frequency point switches.
A switching detection method, the method comprises:
When each arrives in setting-up time cycle, determine the first center frequency point of the signal in this time cycle, and poor with the second corresponding center frequency point of fixedly counting of the described signal of determining, obtain the absolute value of difference;
Judge whether described absolute value is not less than the numerical value of setting, if so, determine that the frequency of signal switches, otherwise, determine that the frequency of signal does not switch.
A change detection equipment, this equipment comprises:
Determination module, for when each setting-up time cycle arrives, determines the first center frequency point of the signal in this time cycle;
Computing module, for described the first center frequency point second center frequency point corresponding with fixedly counting of described signal is poor, and obtains the absolute value of difference;
Judge module, for judging whether absolute value that computing module obtains is not less than the numerical value of setting, if so, determines that the frequency of signal switches, otherwise, determine that the frequency of signal does not switch.
A change detection system, this system comprises the first frequency checkout equipment and the second frequency checkout equipment, wherein:
The first frequency checkout equipment, for when each setting-up time cycle arrives, determine the first center frequency point of the signal in this time cycle, and the second center frequency point of determining with the second frequency checkout equipment is poor, and obtain the absolute value of difference, and judge whether described absolute value is not less than the numerical value of setting, if, the frequency of determining signal switches, otherwise, determine that the frequency of signal does not switch;
The second frequency checkout equipment, for determining the second center frequency point of the respective signal of fixedly counting of described signal, and is sent to the first frequency checkout equipment.
Beneficial effect of the present invention is as follows:
The embodiment of the present invention is when each setting-up time cycle arrives, determine the first center frequency point of the signal in this time cycle, and second center frequency point corresponding with fixedly counting of predetermined described signal is poor, and when the absolute value of the difference obtaining is not less than the numerical value of setting, the frequency of determining signal switches, by the side-play amount of signal frequency point, determine fast whether the frequency of signal is offset, especially in frequency hopping applied environment, by determining frequency this event that whether switches, avoided causing predistortion dynamically to adjust the problem of poor performance when larger skew occurs signal frequency point, improve predistortion and dynamically adjusted performance, and then improved the quality of signal.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of frequency switching detection method of embodiment mono-;
Fig. 2 is the schematic flow sheet of a kind of frequency switching detection method of embodiment bis-;
Fig. 3 is the structural representation of a kind of frequency change detection equipment of embodiment tri-;
Fig. 4 is the structural representation of a kind of frequency change detection system of embodiment tetra-.
Embodiment
In order to realize object of the present invention, the embodiment of the present invention provides a kind of frequency switching detection method, equipment and system, when each setting-up time cycle arrives, determine the first center frequency point of the signal in this time cycle, and second center frequency point corresponding with fixedly counting of predetermined described signal is poor, and when the absolute value of the difference obtaining is not less than the numerical value of setting, determine that the frequency of signal switches.Compared with prior art, by the side-play amount of signal frequency point, determine fast whether the frequency of signal is offset, and then according to definite frequency point information, determine the trend of work of digital pre-distortion, especially in frequency hopping applied environment, by determining whether frequency switches, avoided causing predistortion dynamically to adjust the problem of poor performance when larger skew occurs signal frequency point, improved predistortion and dynamically adjusted performance, and then improved the quality of signal.
Below in conjunction with Figure of description, the scheme of embodiments of the invention is described in detail.
Embodiment mono-:
As shown in Figure 1, be the schematic flow sheet of a kind of frequency switching detection method of the present embodiment one.The concrete steps of this frequency switching detection method comprise:
Step 101: when each setting-up time cycle arrives, determine the first center frequency point of the signal in this time cycle.
In this step 101, the described setting-up time cycle refers to one section of long T of set time.That is to say, when each set time T arrives, determine the first center frequency point of the signal of T in the time.
Described time span T can be according to actual needs or empirical value determine.
Step 102: poor with the second corresponding center frequency point of fixedly counting of the described signal of determining, obtain the absolute value of difference.
In step 102, after can pre-determining, described the second center frequency point is stored in this locality, and can be also the second center frequency point of simultaneously determining when determining the first center frequency point.
Fixedly counting of described signal refers to counting of collection signal some, the sizes values of fixedly counting can be according to actual needs or empirical value determine.
Step 103: judge whether described absolute value is not less than the numerical value of setting, if so, performs step 104, otherwise, perform step 105;
Step 104: the frequency of determining signal switches;
Step 105: the frequency of determining signal does not switch.
In step 103, when the result of judgement is described absolute value while being not less than the numerical value of setting, illustrate that signal, in the setting-up time cycle, larger skew has occurred, determine that signal frequency point switches; When the result of judgement is described absolute value while being less than the numerical value of setting, illustrate that signal not have in the setting-up time cycle skew that generation is larger, determines that signal frequency point switches in normal range (NR).
The feature that the numerical value of described setting can have a linear relationship according to the actual frequency of signal and normalization frequency is determined and is obtained, and also can determine and obtain based on experience value.
By the scheme of embodiment mono-, determine first center frequency point (be actual frequency) of setting-up time in the cycle and second center frequency point (being normalization frequency) of fixedly counting, and the absolute value of difference between the first center frequency point and the second center frequency point and the numerical value of setting are compared, according to comparative result, whether the frequency of determining signal there is switching, avoided signal frequency point when there is larger skew, to occur that digital pre-distortion dynamically adjusts the problem of weak effect, reach raising digital pre-distortion dynamic property, and then improved communication quality.
Embodiment bis-:
As shown in Figure 2, for the present embodiment two is frequency switching detection method concrete flow processs of implementing in equipment that the embodiment of the present invention provides, this flow process comprises the following steps:
Step 201: device power initialization, digital signal processor (DSP), the in the situation that of full power rollback, determines that the performance number of one section of set time T of current demand signal, as power threshold, sends to programmable logic device (FPGA).
In step 201, during device power, in FPGA, power threshold register and normalized power register initial value are all 0.Owing to judging for the first time after device power, DSP does not issue before power threshold, the power threshold register that FPGA is corresponding and normalized power register initial value are all 0, and therefore, FPGA does not do the detection whether signal frequency point switches when each setting cycle arrives yet.
Step 202:DSP, in the pre-distortion coefficients of determining after upgrading, calculates current for upgrading the second center frequency point of the signal of fixedly counting of pre-distortion coefficients.
Specifically, this step realizes by following manner:
The first step: the signal power value of fixedly counting of determining described signal.
Second step: according to the described signal power value of statistics, utilize following formula to calculate the second center frequency point of the respective signal of fixedly counting of current demand signal:
Wherein, W
2be the second center frequency point, the current demand signal that S (i) represent to detect, i represents counting of signal, and N represents fixedly counting of the current demand signal that gathers, and S* (i) represents the conjugated signal of S (i) signal.
The 3rd step: DSP under distribute and search after address table, the second center frequency point of determining is write in the normalized frequency register that FPGA is corresponding.
It should be noted that,, there is corresponding relation between described digital pre-distortion coefficient and the second center frequency point of the current signal of fixedly counting in all right real-time update digital pre-distortion coefficient of DSP.
Step 203:FPGA, when each setting-up time cycle arrives, adds up the performance number of signal in this time cycle.
It should be noted that, when FPGA determines that normalized frequency register is not 0, start, when each setting-up time cycle arrives, to carry out the operation of statistics performance number.
Step 204:FPGA compares the performance number of the signal of statistics and the power threshold receiving, and when the performance number that is the signal of statistics at comparative result is greater than the power threshold receiving, performs step 205; Otherwise perform step 203.
Step 205:FPGA, according to the described signal power value of statistics, utilizes following formula to calculate the first center frequency point of this signal corresponding signal within this time cycle:
Wherein, W
1be the first center frequency point, S (i) represents the current demand signal detecting, and i represents counting of signal, and N represents signal always counting in this fixed time period, and S* (i) represents the conjugated signal of S (i) signal.
Step 206:FPGA, by determining that the first center frequency point is poor with the second center frequency point receiving, obtains the absolute value of difference.
Step 207:FPGA judges whether described absolute value is less than the numerical value of setting, if so, determines that the frequency of signal switches, and performs step 208; Otherwise, determine that the frequency of signal does not switch, perform step 209.
In step 207, digital signal processor DSP is determined a fixing numerical value according to the linear relationship between the actual frequency of signal and normalization frequency, and definite numerical value is write in the register that programmable logic device FPGA is corresponding.
Described definite numerical value that fixed numbers is set, for judging whether signal frequency point switches.
Step 208:FPGA, when definite signal frequency point switches, produces a triggering signal, and designation number predistorter DPD switches to BYPASS state by operating state.
It should be noted that, described BYPASS state refers to the next pre-distortion coefficients that designation number predistorter wait DSP produces.
Step 209:FPGA is not when definite signal frequency point switches, and the pre-distortion coefficients that designation number predistorter utilizes DSP to produce is carried out predistortion adjustment to current signal.
By implementing two scheme, according to the linear relationship between the actual frequency of signal and normalization frequency, the side-play amount of comparison signal frequency determines whether signal frequency point switches, especially in the frequency modulation application of repeater, by the method for determining whether signal frequency point switches, improve further the dynamic property of digital pre-distortion, thereby improved the quality of signal.
Embodiment tri-:
As shown in Figure 3, be the structural representation of a kind of frequency change detection equipment of the present embodiment three.This equipment comprises: determination module 31, computing module 32 and frequency judge module 33.Wherein:
Particularly, described determination module 31, specifically for adding up the signal power value in this time cycle, and according to the described signal power value of statistics, utilizes following formula to calculate the first center frequency point of signal corresponding in this time cycle:
Wherein, W
1be the first center frequency point, S (i) represents the current demand signal detecting, and i represents counting of signal, and N represents signal always counting in fixed time period, and S* (i) represents the conjugated signal of S (i) signal.
Described equipment also comprises: performance number judge module 34.Wherein,
Performance number judge module 34, compares for described signal power value and the predetermined described power threshold that determination module statistics is obtained, and at comparative result, is described signal power value while being greater than described power threshold, triggering computing module.
Described equipment also comprises: handover module 35.Wherein,
Embodiment tetra-:
As shown in Figure 4, be the structural representation of a kind of frequency change detection system of the present embodiment four.This system comprises: the first frequency checkout equipment 41 and the second frequency checkout equipment 42.Wherein,
The first frequency checkout equipment 41, for when each setting-up time cycle arrives, determine the first center frequency point of the signal in this time cycle, and the second center frequency point of determining with the second frequency checkout equipment is poor, and obtain the absolute value of difference, and judge whether described absolute value is not less than the numerical value of setting, if, the frequency of determining signal switches, otherwise, determine that the frequency of signal does not switch.
The second frequency checkout equipment 42, for determining the second center frequency point of the respective signal of fixedly counting of described signal, and is sent to the first frequency checkout equipment 41.
Particularly, described the second frequency checkout equipment 42, specifically for determining the signal power value of fixedly counting of described signal, and according to the described signal power value of statistics, utilize following formula to calculate the second center frequency point of the respective signal of fixedly counting of current demand signal, and send to the first frequency checkout equipment:
Wherein, W
2be the second center frequency point, the current demand signal that S (i) represent to detect, i represents counting of signal, and N represents fixedly counting of the current demand signal that gathers, and S* (i) represents the conjugated signal of S (i) signal.
Described the second frequency checkout equipment 42, also for determining the power threshold of signal, and sends to the first frequency checkout equipment 41;
Described the first frequency checkout equipment 41, also for described signal power value that statistics is obtained and the second frequency checkout equipment, send power threshold compare, and be that described signal power value is while being greater than described power threshold at comparative result, poor with the second center frequency point that the second checkout equipment is determined, and obtain the absolute value of difference, and judge whether described absolute value is not less than the numerical value of setting, if, the frequency of determining signal switches, otherwise, determine that the frequency of signal does not switch.
It should be noted that, described the first frequency checkout equipment 41 is realized by programmable logic device FPGA; Described the second frequency checkout equipment 42 is realized by digital signal processor DSP.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (13)
1. a frequency switching detection method, is characterized in that, the method comprises:
When each arrives in setting-up time cycle, determine the first center frequency point of the signal in this time cycle, and poor with the second corresponding center frequency point of fixedly counting of the described signal of determining, obtain the absolute value of difference;
Judge whether described absolute value is not less than the numerical value of setting, if so, determine that the frequency of signal switches, otherwise, determine that the frequency of signal does not switch.
2. the method for claim 1, is characterized in that, determines the first center frequency point of the signal in this time cycle, specifically comprises:
Add up the signal power value in this time cycle;
According to the described signal power value of statistics, utilize following formula to calculate the first center frequency point of this signal corresponding signal within this time cycle:
Wherein, W
1be the first center frequency point, S (i) represents the current demand signal detecting, and i represents counting of signal, and N represents signal always counting in this fixed time period, and S* (i) represents the conjugated signal of S (i) signal.
3. the method for claim 1, is characterized in that, the second center frequency point of the respective signal of fixedly counting of described signal, pre-determines by following manner:
Determine the signal power value of fixedly counting of described signal;
According to the described signal power value of statistics, utilize following formula to calculate the second center frequency point of the respective signal of fixedly counting of current demand signal, and send:
Wherein, W
2be the second center frequency point, the current demand signal that S (i) represent to detect, i represents counting of signal, and N represents fixedly counting of the current demand signal that gathers, and S* (i) represents the conjugated signal of S (i) signal.
4. method as claimed in claim 2, is characterized in that, before the second center frequency point corresponding with fixedly counting of described signal made difference, described method also comprises:
Described signal power value and predetermined power threshold that statistics is obtained compare;
At comparative result, be described signal power value while being greater than described power threshold, carry out second center frequency point corresponding with fixedly counting of described signal and make poor step.
5. the method as described in claim 1 to 4 any one, is characterized in that, described method also comprises:
When definite frequency switches, produce a triggering signal, the state of digital predistorter DPD is switched to BYPASS state.
6. a frequency change detection equipment, is characterized in that, this equipment comprises:
Determination module, for when each setting-up time cycle arrives, determines the first center frequency point of the signal in this time cycle;
Computing module, for described the first center frequency point second center frequency point corresponding with fixedly counting of described signal is poor, and obtains the absolute value of difference;
Frequency judge module, for judging whether absolute value that computing module obtains is not less than the numerical value of setting, if so, determines that the frequency of signal switches, otherwise, determine that the frequency of signal does not switch.
7. equipment as claimed in claim 6, is characterized in that,
Described determination module, specifically for adding up the signal power value in this time cycle, and according to the described signal power value of statistics, utilizes following formula to calculate the first center frequency point of signal corresponding in this time cycle:
Wherein, W
1be the first center frequency point, S (i) represents the current demand signal detecting, and i represents counting of signal, and N represents signal always counting in fixed time period, and S* (i) represents the conjugated signal of S (i) signal.
8. equipment as claimed in claim 7, is characterized in that, described equipment also comprises:
Performance number judge module, compares for described signal power value and the predetermined described power threshold that determination module statistics is obtained, and at comparative result, is described signal power value while being greater than described power threshold, triggering computing module.
9. the equipment as described in as arbitrary in claim 6 to 8, is characterized in that, described equipment also comprises:
Handover module, for when definite frequency switches, produces a triggering signal, and the state of digital predistorter is switched to BYPASS state.
10. a frequency change detection system, is characterized in that, this system comprises the first frequency checkout equipment and the second frequency checkout equipment, wherein:
The first frequency checkout equipment, for when each setting-up time cycle arrives, determine the first center frequency point of the signal in this time cycle, and the second center frequency point of determining with the second checkout equipment is poor, and obtain the absolute value of difference, and judge whether described absolute value is not less than the numerical value of setting, if, the frequency of determining signal switches, otherwise, determine that the frequency of signal does not switch;
The second frequency checkout equipment, for determining the second center frequency point of the respective signal of fixedly counting of described signal, and is sent to the first frequency checkout equipment.
11. systems as claimed in claim 10, is characterized in that,
Described the second frequency checkout equipment, specifically for determining the signal power value of fixedly counting of described signal, and according to the described signal power value of statistics, utilize following formula to calculate the second center frequency point of the respective signal of fixedly counting of current demand signal, and send to the first frequency checkout equipment:
Wherein, W
2be the second center frequency point, the current demand signal that S (i) represent to detect, i represents counting of signal, and N represents fixedly counting of the current demand signal that gathers, and S* (i) represents the conjugated signal of S (i) signal.
12. systems as claimed in claim 11, is characterized in that,
Described the second frequency checkout equipment, also for determining the power threshold of signal, and sends to the first frequency checkout equipment;
Described the first frequency checkout equipment, also for described signal power value that statistics is obtained and the second frequency checkout equipment, send power threshold compare, and be that described signal power value is while being greater than described power threshold at comparative result, poor with the second center frequency point that the second checkout equipment is determined, and obtain the absolute value of difference, and judge whether described absolute value is not less than the numerical value of setting, if, the frequency of determining signal switches, otherwise, determine that the frequency of signal does not switch.
13. systems as claimed in claim 12, is characterized in that,
Described the first frequency checkout equipment is realized by programmable logic device FPGA;
Described the second frequency checkout equipment is realized by digital signal processor DSP.
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| CN117294372A (en) * | 2023-11-23 | 2023-12-26 | 上海芯袖微电子科技有限公司 | Frequency conversion control method, device and system |
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| CN117294372A (en) * | 2023-11-23 | 2023-12-26 | 上海芯袖微电子科技有限公司 | Frequency conversion control method, device and system |
| CN117294372B (en) * | 2023-11-23 | 2024-02-09 | 上海芯袖微电子科技有限公司 | Frequency conversion control method, device and system |
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