CN102186235B - Automatic-gain-control (AGC) gain generating method and device - Google Patents
Automatic-gain-control (AGC) gain generating method and device Download PDFInfo
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- CN102186235B CN102186235B CN201110081900.XA CN201110081900A CN102186235B CN 102186235 B CN102186235 B CN 102186235B CN 201110081900 A CN201110081900 A CN 201110081900A CN 102186235 B CN102186235 B CN 102186235B
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Abstract
The invention provides an AGC (automatic gain control) gain generating method and device, wherein the method comprises the following steps of: acquiring non-load power variation in the current control period which comprises at least one subframe; and generating an AGC gain of next control period according to the non-load power variation in the current control period and the AGC gain of the current control period. The device comprises a variation acquisition module and a gain generation module, wherein the variation acquisition module is used for acquiring the non-load power variation in the current control period which comprises at least one subframe; and the gain generating module is used for generating the AGC gain of the next control period according to the non-load power variation in the current control period and the AGC gain of the current control period. In the technical scheme provided by the invention, the AGC gain is generated according to the factors except the load change, the problem of in-place control in the prior art under the condition of larger load change is solved and the requirement on the bit width of an ADC (analog-digital converter) and a digital processing chip.
Description
Technical field
The embodiment of the present invention relates to electronic technology field, relates in particular to a kind of automatic gain and adjusts Gain generating method and device.
Background technology
In communication process, the power of signal tends to because therefore the factor times to time change such as channel fading, load and power control, require communication control processor to have certain range of receiving, to guarantee correctly to receive signal.For example: at Long Term Evolution (Long Term Evolution; Referred to as: LTE) in system, communication protocol regulation: the be less than-100dBm of minimum received signal power of communication control processor, and be greater than-20dBm of maximum receiving signal power.Because the power bracket of the signal receiving is larger, (the Analog-to-Digital Converter of the analog to digital converter in inevitable requirement communication control processor; Referred to as: ADC) and follow-up digital processing chip there is higher bit wide (being number of bits), this will increase area and the cost of whole communication control processor.
Prior art adopts automatic gain adjustment (Automatic Gain Control; Referred to as: AGC) technology is adjusted at analog domain signal, the power bracket of signal is dropped in a less scope, to reduce the bit wide of ADC and digital processing chip.In prior art, the method for AGC of realization a kind of is: at analog domain, obtain the power of signal that ought be for the previous period, and in predict future a period of time, the power of signal is constant, according to the power of the signal in ought be for the previous period, generate AGC gain, then according to AGC gain, the signal in following a period of time is adjusted.For example: take LTE system as example, can obtain power ADC output, the interior signal of current 1ms, according to the power of signal in current 1ms, generate the AGC that the signal in follow-up 1ms is adjusted and gain and adjust.The method that another kind is realized AGC is: at numeric field, obtain ought be for the previous period in the average power of each frequency signal on frequency domain, and hypothesis in following a period of time the average power of each frequency signal of frequency domain constant, according to the average power of each frequency signal on frequency domain in ought be for the previous period, generate AGC gain and the signal in following a period of time adjusted.
In realizing process of the present invention, inventor finds that in prior art, at least there are the following problems: when the fluctuation of load is larger, no matter be in time-domain or in frequency domain, the power of the signal that directly basis ought be interior for the previous period generates AGC gain and the signal adjustment in following a period of time be there will be to adjustment problem not in place.For example: take LTE system as example, due to dynamic dispatching, load variations between each subframe is very large, for example may only call 72 subcarriers, also may call 1200 subcarriers, when frequency domain data power on each subcarrier is constant, the time domain power of different subframes changes greatly, in this case, if still adopt prior art generate AGC gain and the signal in lower a period of time is adjusted, not only can not reduce the fluctuation range of the power of signal, can add powerful dynamic range on the contrary, cannot realize the object of the bit wide that reduces ADC and digital processing chip.
Summary of the invention
The embodiment of the present invention provides a kind of automatic gain to adjust Gain generating method and device, adjusts problem not in place, to reduce the bit wide of ADC and digital processing chip in order to solve AGC gain when the fluctuation of load is larger.
The embodiment of the present invention provides a kind of automatic gain to adjust AGC Gain generating method, comprising:
Obtain the unsupported power variation in current adjustment cycle, described adjustment cycle comprises at least one subframe;
According to the AGC gain of the unsupported power variation in described current adjustment cycle and described current adjustment cycle, generate the AGC gain of next adjustment cycle.
The embodiment of the present invention provides a kind of automatic gain to adjust AGC Gain generating device, comprising:
Variable quantity acquisition module, for obtaining the unsupported power variation in current adjustment cycle, described adjustment cycle comprises at least one subframe;
Gain generating module, for according to the AGC gain of the unsupported power variation in described current adjustment cycle and described current adjustment cycle, generates the AGC gain of next adjustment cycle.
The embodiment of the present invention provides again a kind of automatic gain to adjust AGC Gain generating method, comprising:
AGC gain according to the received signal strength indicator RSSI of signal in current adjustment cycle and current adjustment cycle, generates antenna opening power, and described current adjustment cycle comprises at least one subframe;
According to described antenna opening power, obtain the AGC gain of next adjustment cycle.
The embodiment of the present invention provides again a kind of automatic gain to adjust AGC Gain generating device, comprising:
Power generation module, for according to the AGC gain of the received signal strength indicator RSSI of signal in current adjustment cycle and current adjustment cycle, generates antenna opening power, and described current adjustment cycle comprises at least one subframe;
Gain acquisition module, for according to described antenna opening power, obtains the AGC gain of next adjustment cycle.
The automatic gain of the embodiment of the present invention is adjusted Gain generating method and device, by obtaining the unsupported power variation in current adjustment cycle, according to the unsupported power variation in current adjustment cycle and AGC gain, generate the AGC gain of next adjustment cycle, or by obtaining antenna opening power, according to antenna opening power, generate the AGC gain of next adjustment cycle, solved the adjustment problem not in place that prior art occurs in the situation that load variations is larger, the AGC gain that adopts the embodiment of the present invention to generate, even also the power bracket of signal can be reduced to less scope in the situation that load variations is larger, the requirement of reduction to the bit wide of ADC and digital processing chip.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The flow chart of the AGC Gain generating method that Fig. 1 provides for the embodiment of the present invention one;
The flow chart of the AGC Gain generating method that Fig. 2 A provides for the embodiment of the present invention two;
Fig. 2 B is the time-frequency two-dimensional schematic diagram of the downstream signal of existing LTE system;
Fig. 2 C is the spatial structure schematic diagram of the descending pilot frequency of existing LTE system;
The flow chart of the AGC Gain generating method that Fig. 3 provides for the embodiment of the present invention three;
The flow chart of the AGC Gain generating method that Fig. 4 provides for the embodiment of the present invention four;
The structural representation of the AGC Gain generating device that Fig. 5 provides for the embodiment of the present invention five;
The structural representation of the AGC Gain generating device that Fig. 6 A provides for the embodiment of the present invention six;
The use structural representation of the AGC Gain generating device that Fig. 6 B provides for the embodiment of the present invention six;
The structural representation of the AGC Gain generating device that Fig. 7 A provides for the embodiment of the present invention seven;
The use structural representation of the AGC Gain generating device that Fig. 7 B provides for the embodiment of the present invention seven;
A kind of structural representation of the AGC Gain generating device that Fig. 8 A provides for the embodiment of the present invention eight;
Another structural representation of the AGC Gain generating device that Fig. 8 B provides for the embodiment of the present invention eight.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The flow chart of the AGC Gain generating method that Fig. 1 provides for the embodiment of the present invention one.As shown in Figure 1, the AGC Gain generating method of the present embodiment comprises:
Wherein, unsupported power variation refers to that the power that other factors produce except load changes.For example: it is inconsistent that power is controlled the signal power that may make communication control processor successively receive; Again for example: channel fading also can affect the power of signal, because priority channel fading difference causes the power of the signal that communication control processor receives inconsistent.
In the present embodiment, adjustment cycle can be the length of a subframe, can be also the length of a plurality of subframes.In each adjustment cycle, to all data, all adopt identical gain to process, i.e. the head adjustment at each adjustment cycle gains.
Concrete, by the unsupported power variation in current adjustment cycle, the AGC of current adjustment cycle to be adjusted, the AGC gain after adjusting is as the AGC gain of next adjustment cycle.Then, the AGC gain after utilize adjusting starts the data adjustment that gains at the head of next adjustment cycle.
Wherein, the AGC gain of next adjustment cycle is to change by the unsupported power variation in current adjustment cycle being predicted as to the power that the factor except load variations in next adjustment cycle causes, then the AGC of current adjustment cycle gained to adjust and obtains.The AGC gain of this next one adjustment cycle does not consider that the power that load variations causes changes this factor, therefore, can solve the AGC causing because of load variations and adjust problem not in place.
The AGC Gain generating method of the present embodiment, by obtaining the unsupported power variation in current adjustment cycle, according to the unsupported power variation in current adjustment cycle and AGC gain, generate the AGC gain of next adjustment cycle, during due to generation AGC gain, do not consider load-factor, therefore, when the signal that the AGC gain that employing the present embodiment generates receives receiver carries out AGC adjustment, can solve the adjustment problem not in place that prior art occurs in the situation that load variations is larger, even also the power bracket of signal can be reduced to less scope in the situation that load variations is larger, the requirement of reduction to the bit wide of follow-up ADC and digital processing chip.
The flow chart of the AGC Gain generating method that Fig. 2 A provides for the embodiment of the present invention two; Fig. 2 B is the time-frequency two-dimensional schematic diagram of the downstream signal of existing LTE system; Fig. 2 C is the spatial structure schematic diagram of the descending pilot frequency of existing LTE system.The present embodiment can be realized based on embodiment mono-, and as shown in Figure 2 A, the AGC Gain generating method of the present embodiment comprises:
Wherein, the RSSI of signal is in order to the power of characterization signal; The required power of pilot tone during pilot power refers to and transmits.
Concrete, the present embodiment can be processed at numeric field.For example: the digital signal of ADC output in obtaining communication receiver, and the digital signal based on ADC output obtains the RSSI of signal in current adjustment cycle, simultaneously by the digital signal of obtaining being done to the pilot power of further processing in frequency domain obtains current adjustment cycle.The LTE system shown in Fig. 2 B-Fig. 2 C of take is example, describes the specific implementation of this step in detail.
As shown in Figure 2 B, a downstream signal of LTE system is 1 time slot in the length of time domain, and each time slot comprises 7 symbols, is respectively l=0...6; Every two time slots form a subframe, as shown in Figure 2 C.In Fig. 2 B and Fig. 2 C, each grid represents 1 Resource Block of frequency domain.Fig. 2 C is depicted as 1 subframe (i.e. two time slots) of the time domain, " R in Fig. 2 C
0" representing the position of pilot tone in signal, each subframe comprises 14 symbols; From time domain, the symbol that comprises pilot tone is respectively l=0,4,7 and 11.
Based on above-mentioned, a kind of mode of obtaining the RSSI of signal in current adjustment cycle is: the whole digital signal sampling points in current adjustment cycle are added up at the power of time domain, using the RSSI of this power sum signal in current adjustment cycle.Take current adjustment cycle as the subframe shown in Fig. 2 C be example, add up the power of all symbols (totally 14 symbols) in this subframe, using the RSSI of this power sum signal in current adjustment cycle.
Wherein, consider and likely do not send data-signal, only send pilot tone, therefore, the present embodiment separately provides a kind of mode of obtaining the RSSI of signal in current adjustment cycle to be: the symbol that obtains a plurality of pilot tones place in signal in current adjustment cycle; The power corresponding to symbol at a plurality of pilot tones place is added up, using power corresponding to the symbol at a plurality of pilot tones place and in current adjustment cycle the RSSI of signal.Still take current adjustment cycle as the subframe shown in Fig. 2 C be example, add up the power of pilot tone place symbol (l=0,4,7 and 11), using the RSSI of this power sum signal in current adjustment cycle.In addition, also the power sum of the pilot tone place symbol counting can be carried out being re-used as after suitable numerical value processing the RSSI of signal in current adjustment cycle.
A kind of mode that the present embodiment obtains the pilot power in current adjustment cycle is: the Resource Block that obtains a plurality of pilot tones place in signal in current adjustment cycle; The power corresponding to Resource Block at a plurality of pilot tones place is added up, the pilot power using power sum in current adjustment cycle.Take current adjustment cycle as the subframe shown in Fig. 2 C be example, add up 8 " R
0" shown in the power of Resource Block, this power sum is the pilot power in current adjustment cycle.
Step 22, by the difference of the pilot power in the pilot power in current adjustment cycle and a upper adjustment cycle, change thresholding with power and compare; When comparative result is difference when being greater than power and changing thresholding, perform step 23; When difference is not more than power threshold, perform step 24.
Due in each subframe, public guide frequency is to continue to send always, namely pilot tone load is invariable, so the variation of pilot power can not be caused by load variations, therefore, the present embodiment characterizes with the difference of the pilot power in former and later two adjustment cycles the power being caused by other factors except load to be changed, and has preset for judging that the power being caused by other factors changes big or small power variation thresholding.When difference is greater than power variation thresholding, illustrate that the variation of the signal power being caused by other factors beyond load is larger, need to adjust the gain of signal, to reduce the impact of other factors on the power bracket of follow-up signal.When difference is not more than power variation thresholding, the variation that the signal power that other factors except load cause is described is not very large, the impact that other factors produce signal power scope can be ignored, and also illustrates that the AGC gain of current adjustment cycle has good adjustment effect.
Concrete, when this step changes greatly for the power causing in other factors except load, obtain unsupported power variation, and according to this unsupported power variation, AGC is gained and adjusted, to generate new AGC gain, make according to this new AGC gain, the follow-up signal receiving to be reached and preferably adjusts effect.
RSSI
change＝RSSI
TARGET-RSSI[n] (1)
Wherein, RSSI
changerepresent unsupported power variation, RSSI
tARGETrepresent target RSSI, RSSI[n] represent the RSSI in current adjustment cycle.Formula (1) is depicted as a kind of method that generates unsupported power variation, and it is poor that the RSSI that is about to signal in target RSSI and current adjustment cycle does, using this difference as unsupported power variation.Wherein, target RSSI is predefined.Because the variation of signal power is mainly to be caused by the factor beyond load, therefore, what from this target RSSI, remove that the RSSI of signal in current adjustment cycle obtains is exactly unsupported power variation.Concrete, if target RSSI is greater than the RSSI of signal in current adjustment cycle, unsupported power variation is greater than 0, illustrates, current AGC gain is too small, the AGC gain of current adjustment cycle need to be increased.If target RSSI is less than the RSSI of signal in current adjustment cycle, unsupported power variation is less than 0, illustrates that current AGC gain is excessive, the AGC gain in current adjustment cycle need to be reduced.In addition, if when target RSSI equals the RSSI of signal in current adjustment cycle, unsupported power variation is 0, the AGC gain of current adjustment cycle is described just, without it is adjusted.
Unsupported power variation in step 24, current adjustment cycle is set to 0, and performs step 25.
Concrete, for the impact in other factors except load hour, it is 0 that unsupported power variation is directly set to this step, the AGC of current adjustment cycle is not gained and is not adjusted.
AGCgain[n+1]＝AGCgain[n]+RSSI
change (2)
Wherein, AGCgain[n+1] represent that the AGC of next adjustment cycle gains, AGCgain[n] represent that the AGC of current adjustment cycle gains.Concrete, as shown in formula (2), the AGC gain that the AGC gain of current adjustment cycle and the unsupported power variation in current adjustment cycle are added to obtain next adjustment cycle.Wherein, when unsupported power variation is 0, the AGC of next adjustment cycle gain is identical with the AGC gain of current adjustment cycle, the AGC gain of current adjustment cycle is not adjusted.When unsupported power variation is not 0, if unsupported power variation is greater than 0, the AGC gain of current adjustment cycle is increased; Otherwise, if unsupported power variation is less than 0, the AGC gain of current adjustment cycle is reduced.
The AGC Gain generating method of the present embodiment, by obtaining the pilot power in current adjustment cycle, and the pilot power based in former and later two adjustment cycles is inferred the size of the unsupported power variation in a following adjustment cycle, then the size based on this unsupported power variation determines whether by the RSSI of signal in current adjustment cycle, the AGC gain of current adjustment cycle to be adjusted, to obtain the AGC gain of next adjustment cycle.Wherein, the impact of load variations is not considered in the AGC gain of obtaining due to the present embodiment, therefore, when the gain of signal is adjusted by the AGC gain of the present embodiment, can not exist because load variations is compared with occurring greatly adjusting problem not in place, improved the quality that signal gain is adjusted, can be by the Power Limitation of signal in less scope, to guarantee that follow-up ADC and digital signal processing chip have lower bit wide.
The flow chart of the AGC Gain generating method that Fig. 3 provides for the embodiment of the present invention three.The present embodiment is realized based on embodiment mono-, and as shown in Figure 3, the AGC Gain generating method of the present embodiment comprises:
The method that the present embodiment obtains the RSSI of signal in current adjustment cycle can, referring to the description in step 21 in embodiment bis-, not repeat them here.Load information refers to the service condition of the resource of carrying signal, such as symbol or Resource Block, is used how many (such as 1/2,1/4 etc.).
Wherein, the load information in current adjustment cycle can be by radio network controller (Radio Network Controller; Referred to as: RNC) or base station (NodeB) etc. by high-level signaling message, be handed down to communication control processor, this high-level signaling message comprises the load information of current adjustment cycle.This load information can be for example: present load accounts for 10 Resource Block (RB), and communication control processor can calculate poor with respect to full load power of current power.
Concrete, after the load information in getting current adjustment cycle, can know full load RSSI corresponding to signal in current adjustment cycle according to this load information.For example: when high-level signaling message notifies the load of current adjustment cycle to account for 10 RB by load information, suppose that it is 1/2 o'clock of full load that communication control processor calculates now load, by the RSSI of signal in the current adjustment cycle obtaining is increased to 3dB, can obtain full load RSSI.Again for example: when high-level signaling message notifies the load of current adjustment cycle to be full load by load information, in the current adjustment cycle that the present embodiment obtains, the RSSI of signal is full load RSSI.
Concrete, the full load RSSI obtaining in step 32 had both comprised the power that current adjustment cycle internal cause load produces, also comprise that the power producing because of other factors except load changes, therefore, it is poor that target RSSI and full load RSSI are done, this difference is the power that other factors except load produce and changes, i.e. unsupported power variation, as shown in formula (3).
RSSI
change＝RSSI
TARGET-RSSI_Full[n] (3)
Wherein, RSSI_Full[n] represent the full load RSSI in current adjustment cycle; Remaining variable implication can be with reference to the same variable of former embodiment.
Wherein, when target RSSI is greater than full load RSSI, unsupported power variation is greater than at 0 o'clock, illustrates that the AGC gain of current adjustment cycle is less, need to be increased; When target RSSI is less than full load RSSI, unsupported power variation is less than 0, illustrates that the AGC gain of current adjustment cycle is larger, need to be reduced; When target RSSI equals full load RSSI, unsupported power variation equals at 0 o'clock, and the AGC gain that current adjustment cycle is described has preferably adjusts effect, without it is adjusted.Target RSSI is predefined, bearing power when it can be default signal full load.
Concrete, this step also can generate the AGC gain of next adjustment cycle according to formula (2), specifically can, referring to the detailed description of step 25 in embodiment bis-, not repeat them here.
The AGC Gain generating method of the present embodiment, by obtaining the load information of current adjustment cycle, according to this load information, obtain full load RSSI corresponding to signal in current adjustment cycle, it is poor by target RSSI and full load RSSI are done, to obtain unsupported power variation, and according to unsupported power variation, the AGC gain of current adjustment cycle is adjusted, to obtain the AGC gain of next adjustment cycle.Wherein, the impact of load variations is not considered in the AGC gain of obtaining due to the present embodiment, therefore, when the gain of signal is adjusted by the AGC gain of the present embodiment, can not exist because load variations is compared with occurring greatly adjusting problem not in place, improved the quality that signal gain is adjusted, can be by the Power Limitation of signal in less scope, to guarantee that follow-up ADC and digital signal processing chip have lower bit wide.
In the various embodiments described above, step 12, step 25 or step 34 are mainly the AGC gains of the next adjustment cycle of AGC Gain generating based on current adjustment cycle, with signal communication control processor being received according to the new AGC gain the generating adjustment that gains.Following examples of the present invention separately provide a kind of execution mode that generates the AGC gain of next adjustment cycle.
The flow chart of the AGC Gain generating method that Fig. 4 provides for the embodiment of the present invention four.As shown in Figure 4, the method for the present embodiment comprises:
Step a, obtain the RSSI of signal in current adjustment cycle;
In the present embodiment, adjustment cycle can be the length of a subframe, can be also the length of a plurality of subframes.In each adjustment cycle, to all data, all adopt identical gain to process, i.e. the head adjustment at each adjustment cycle gains.
Wherein, the execution mode that obtains the RSSI of signal in current adjustment cycle comprises: step a1, obtain the symbol at a plurality of pilot tones place in signal in current adjustment cycle; Step a2, the power corresponding to symbol at a plurality of pilot tones place is added up, using power corresponding to the symbol at a plurality of pilot tones place and in current adjustment cycle the RSSI of signal.About step a1 and step a2, specifically can, referring to the description in step 21 in embodiment bis-, not repeat them here.
Step b, according to the RSSI of signal in current adjustment cycle and the AGC of current adjustment cycle gain, generate antenna opening power;
AntPow＝RSSI[n]-AGCgain[n] (4)
Wherein, AntPow represents antenna opening power.As shown in formula (4), with the RSSI of signal in current adjustment cycle, deduct the AGC gain of current adjustment cycle, the difference of obtaining is antenna opening power.In the present embodiment, antenna opening power is for representing the actual RSSI of signal radio frequency unit output, that be about to input ADC of communication control processor and the difference of desirable RSSI.
Step c, according to antenna opening power, obtain the AGC gain of next adjustment cycle.
Concrete, according to the demand of the algorithm that signal is processed using after the amplifying power of ADC in communication control processor and ADC, target setting antenna opening power.This target antenna mouth power is a kind of RSSI value of the ideal signal that can meet ADC and subsequent algorithm demand of the radio frequency unit output in communication control processor, is called again target RSSI.Shown in following formula (5), after generating antenna opening power, with predefined target RSSI, deduct antenna opening power, the difference of obtaining is the AGC gain of next adjustment cycle.
AGCgain[n+1]＝RSSI
TARGET-AntPow (5)
Wherein, if antenna opening power equals 0, the AGC gain that current adjustment cycle is described has preferably adjusts effect, the RSSI of the signal of radio frequency unit output can meet the demand of ADC and subsequent algorithm, the AGC of next adjustment cycle gain is identical with the AGC gain of current adjustment cycle, the AGC gain of current adjustment cycle is not adjusted.When antenna opening power is not 0, if antenna opening power is greater than 0, the adjustment poor effect of the AGC gain of current adjustment cycle is described, make the RSSI of signal of radio frequency unit output too high, the upper limit that may exceed ADC and subsequent algorithm demand, reduces the AGC gain of current adjustment cycle; Otherwise, if antenna opening power is less than 0, the adjustment poor effect of the AGC gain of the current adjustment cycle of explanation, makes the RSSI of signal of radio frequency unit output too low, may, lower than the lower limit of ADC and subsequent algorithm demand, the AGC gain of current adjustment cycle be increased.
In this explanation, this execution mode is identical with the mode that the AGC of above-described embodiment two or the next adjustment cycle of embodiment tri-generation gains in principle.
Why the present embodiment obtains antenna opening power according to the RSSI of signal in current adjustment cycle, the form that is based on the upper antenna opening power of actual realization and is generally with list is stored in communication control processor, based on this, when getting antenna opening power, can be directly according to antenna opening power inquiry respective list, to obtain corresponding AGC yield value, this AGC yield value is the AGC gain of next adjustment cycle.By the mode speed of hardware table look-at.
The AGC Gain generating method of the present embodiment, by obtaining the RSSI of signal in current adjustment cycle, it is poor that the RSSI of signal in current adjustment cycle and the AGC of current adjustment cycle gain is done, obtain antenna opening power, and according to antenna opening power, the AGC gain of current adjustment cycle is adjusted, to obtain the AGC gain of next adjustment cycle.The present embodiment is in the process of AGC gain of obtaining next adjustment cycle, do not consider the impact of load variations, therefore, when the gain of signal is adjusted by the AGC gain of the present embodiment, can not exist because load variations is compared with occurring greatly adjusting problem not in place, improved the quality that signal gain is adjusted, can be by the Power Limitation of signal in less scope, to guarantee that follow-up ADC and digital signal processing chip have lower bit wide.
The structural representation of the AGC Gain generating device that Fig. 5 provides for the embodiment of the present invention five.As shown in Figure 5, the device of the present embodiment comprises: variable quantity acquisition module 41 and Gain generating module 42.
Wherein, variable quantity acquisition module 41, for obtaining the unsupported power variation in current adjustment cycle, described adjustment cycle comprises at least one subframe; Gain generating module 42, for according to the AGC gain of the unsupported power variation in current adjustment cycle and current adjustment cycle, generates the AGC gain of next adjustment cycle.This Gain generating module 42 can be a processor.
Each functional module of the present embodiment AGC Gain generating device can be used for carrying out the flow process of the AGC Gain generating method that said method embodiment provides, and its operation principle can, referring to the description of said method embodiment, not repeat them here.
The AGC Gain generating device of the present embodiment, by obtaining the unsupported power variation in current adjustment cycle, according to the unsupported power variation in current adjustment cycle and AGC gain, generate the AGC gain of next adjustment cycle, during due to generation AGC gain, do not consider load-factor, therefore, when the signal that the AGC gain that the present embodiment generates receives receiver carries out AGC adjustment, can solve the adjustment problem not in place that prior art occurs in the situation that load variations is larger, even also the power bracket of signal can be reduced to less scope in the situation that load variations is larger, the requirement of reduction to the bit wide of follow-up ADC and digital processing chip.
The structural representation of the AGC Gain generating device that Fig. 6 A provides for the embodiment of the present invention six; The use structural representation of the AGC Gain generating device that Fig. 6 B provides for the embodiment of the present invention six.The present embodiment is realized based on embodiment tetra-, as shown in Figure 6A, in the present embodiment, variable quantity acquisition module 41 comprises: first obtains that submodule 411, second obtains submodule 412, comparison sub-module 413, the 3rd is obtained submodule 414 and the 4th and obtained submodule 415.
The operation principle of this variable quantity acquisition module 41 is: first obtains submodule 411, obtains the RSSI of signal in current adjustment cycle, and offers the 3rd and obtain submodule 414, and first to obtain submodule 411 can be specifically a port for this; Second obtains submodule 412 obtains the pilot power in current adjustment cycle, and offers comparison sub-module 413; Comparison sub-module 413, by the difference of the pilot power in the pilot power in current adjustment cycle and a upper adjustment cycle, changes thresholding with power and compares; Comparison sub-module 413 is specifically as follows a comparator, for example, can be formed by logic gate array; The 3rd to obtain submodule 414 be that difference is when being greater than power and changing thresholding at the comparative result of comparison sub-module 413, according to the RSSI of signal in target RSSI and current adjustment cycle, obtain the unsupported power variation in current adjustment cycle, the 3rd to obtain submodule 414 can be a processor; The 4th to obtain submodule 415 be difference when being not more than power and changing thresholding at the comparative result of comparison sub-module 413, and the unsupported power variation in current adjustment cycle is set to 0, the four and obtains submodule 415 and can be another processor.Wherein, the 3rd obtain submodule 414 and the 4th and obtain submodule 415 unsupported power variation is provided respectively under different situations.
Further, first obtain submodule 411 and comprise: the first acquiring unit and second acquisition unit.The first acquiring unit, for obtaining the symbol at a plurality of pilot tones place of signal in current adjustment cycle; Second acquisition unit can be a processor, for the power corresponding to symbol at a plurality of pilot tones place is added up, to obtain the RSSI of signal in current adjustment cycle.
Second obtains submodule 412 comprises: the 3rd acquiring unit and the 4th acquiring unit.The 3rd acquiring unit, for obtaining the Resource Block at a plurality of pilot tones place of signal in current adjustment cycle; The 4th acquiring unit can be another processor, for the power corresponding to Resource Block at a plurality of pilot tones place is added up, to obtain the pilot power in current adjustment cycle.
Each function sub-modules of variable quantity acquisition module 41 or functional unit can be used for carrying out the flow process of obtaining the unsupported power variation in current adjustment cycle that said method embodiment provides, and its operation principle repeats no more, and refers to the description of embodiment of the method.
As shown in Figure 6B, first of the present embodiment AGC Gain generating device obtains submodule 411 and is connected with the output of ADC in communication control processor (part-structure is only shown), second obtains submodule 412 is connected with fast Fourier transform (FFT) unit in communication control processor, and first obtains submodule 411 and second obtains submodule 412 and can be respectively two interfaces; Gain generating module 42 is for to the radio frequency of communication control processor (Radio Frequency; Referred to as: RF)/Analog Baseband (Analog Base Band; Referred to as the adjustment that gains of: the signal that ABB) unit receives, and after adjustment, send into ADC, its specific works principle refers to above-mentioned.
The AGC Gain generating device of the present embodiment, by above-mentioned each function sub-modules or unit, obtain the unsupported power variation of current adjustment cycle, the AGC gain of obtaining next adjustment cycle based on current unsupported power variation for AGC provides basis, make the AGC Gain generating device of the present embodiment carry out AGC adjustment according to the factor generation AGC gain except load variations the signal that receiver is received, solved the adjustment problem not in place that prior art occurs in the situation that load variations is larger, even also the power bracket of signal can be reduced to less scope in the situation that load variations is larger, the requirement of reduction to the bit wide of follow-up ADC and digital processing chip.
The structural representation of the AGC Gain generating device that Fig. 7 A provides for the embodiment of the present invention seven; The use structural representation of the AGC Gain generating device that Fig. 7 B provides for the embodiment of the present invention seven.The present embodiment is realized based on embodiment tetra-, as shown in Figure 7 A, in the present embodiment, variable quantity acquisition module 41 can also, by another kind of implementation structure, specifically comprise: the 5th obtains submodule 416, the 6th obtains submodule 417, the 7th and obtain submodule 418 and the 8th and obtain submodule 419.
The operation principle of this variable quantity acquisition module 41 is: the 5th obtains the RSSI that submodule 416 obtains signal in current adjustment cycle, and offers the 7th and obtain submodule 418; The 6th obtains submodule 417 obtains the load information in current adjustment cycle, and offers the 7th and obtain submodule 418; The 5th obtains submodule 416 and the 6th obtains submodule 417 and can be respectively two interfaces; The 7th obtains submodule 418 according to the load information in the RSSI of signal in current adjustment cycle and current adjustment cycle, obtains full load RSSI, and offers the 8th and obtain submodule 419, and it can be a processor; The 8th obtains submodule 419 according to target RSSI and full load RSSI, obtains the unsupported power variation in current adjustment cycle, and it can be another processor.
Wherein, the 6th obtains the high-level signaling message that submodule 417 specifically can send by receiving RNC or NodeB etc., obtains the load information in current adjustment cycle.
Wherein, the 5th implementation structure that obtains submodule 416 can, referring to the first structure of obtaining submodule 411 in above-described embodiment five, not repeat them here.
Each function sub-modules of variable quantity acquisition module 41 or functional unit can be used for carrying out the flow process of obtaining the unsupported power variation in current adjustment cycle that said method embodiment provides, and its operation principle repeats no more, and refers to the description of embodiment of the method.
In this explanation, variable quantity acquisition module 41 can also comprise each submodule in the present embodiment and embodiment five simultaneously, and this structure is no longer illustrated.
In the present embodiment, Gain generating module 42, specifically for the AGC gain of the unsupported power variation in current adjustment cycle and current adjustment cycle is added, generates the AGC gain of next adjustment cycle, and it can be realized by processor.
As shown in Figure 7 B, the 5th of the present embodiment AGC Gain generating device obtains submodule 416 and is connected with the output of ADC in communication control processor, the 6th obtains submodule 417 is connected with air interface, the signal that Gain generating module 42 receives for RF/ABB unit to the communication control processor adjustment that gains, and after adjustment, send into ADC, its specific works principle refers to above-mentioned.
The AGC Gain generating device of the present embodiment, according to the factor generation AGC gain except load variations the signal that receiver is received, carry out AGC adjustment, solved the adjustment problem not in place that prior art occurs in the situation that load variations is larger, even also the power bracket of signal can be reduced to less scope in the situation that load variations is larger, reduce the requirement to the bit wide of follow-up ADC and digital processing chip.
A kind of structural representation of the AGC Gain generating device that Fig. 8 A provides for the embodiment of the present invention eight.As shown in Figure 8 A, the present embodiment AGC Gain generating device comprises: power generation module 81 and gain acquisition module 82.
Wherein, power generation module 81, for according to the RSSI of signal in current adjustment cycle and the AGC of front adjustment cycle gain, generates antenna opening power, and described current adjustment cycle comprises at least one subframe; Power generation module 81 specifically can generate antenna opening power according to formula (4), and it can be a processor.Gain acquisition module 82, is connected with power generation module 81, for according to antenna opening power, obtains the AGC gain of next adjustment cycle; Gain acquisition module 82 specifically can obtain the AGC gain of next adjustment cycle according to formula (5), it can be a processor.
In addition, on reality realizes, gain acquisition module 82 can also be searched the list corresponding with antenna opening power being stored in communication control processor according to antenna opening power, obtains the AGC yield value of next adjustment cycle.
Further, as shown in Figure 8 B, the AGC Gain generating device of the present embodiment can also comprise: symbol acquisition module 83 and signal strength signal intensity acquisition module 84.
Wherein, symbol acquisition module 83, for obtaining the symbol at a plurality of pilot tones place of signal in current adjustment cycle.Signal strength signal intensity acquisition module 84, is connected with symbol acquisition module 83, for the power corresponding to symbol at a plurality of pilot tones place is added up, obtains the RSSI of signal in current adjustment cycle, and offers power generation module 81; This signal strength signal intensity acquisition module 84 can be specifically a processor.
Above-mentioned each functional module of the present embodiment AGC Gain generating device can be used for carrying out the flow process of the AGC Gain generating method that above-described embodiment four provides, and its operation principle repeats no more, can be referring to the description of embodiment of the method.
The AGC Gain generating device of the present embodiment, by above-mentioned each module, obtain the RSSI of signal in current adjustment cycle, by the RSSI of signal in current adjustment cycle and the AGC of current adjustment cycle, gained, generate antenna opening power, and then according to antenna opening power, the AGC gain of current adjustment cycle is adjusted, obtain the AGC gain of next adjustment cycle, in this process, do not consider the impact of load variations, therefore, when adjusting the gain of signal, the AGC of the next adjustment cycle obtaining by the present embodiment AGC Gain generating device gain can not exist because load variations is compared with occurring greatly adjusting problem not in place, improved the quality that signal gain is adjusted, can also be by the Power Limitation of signal in less scope, to guarantee that follow-up ADC and digital signal processing chip have lower bit wide.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (14)
1. automatic gain is adjusted an AGC Gain generating method, it is characterized in that, comprising:
Obtain the unsupported power variation in current adjustment cycle, described adjustment cycle comprises at least one subframe, and the unsupported power variation in described current adjustment cycle refers to that the power that other factors produce except load changes;
According to the AGC gain of the unsupported power variation in described current adjustment cycle and described current adjustment cycle, generate the AGC gain of next adjustment cycle; The AGC gain of described next adjustment cycle is to change by the unsupported power variation in described current adjustment cycle being predicted as to the power that the factor except load variations in described next adjustment cycle causes, the AGC of described current adjustment cycle gained to adjust and obtain;
Wherein, the unsupported power variation obtaining described in current adjustment cycle comprises: obtain the received signal strength indicator RSSI of signal in described current adjustment cycle and the pilot power in described current adjustment cycle; By the difference of the pilot power in the pilot power in described current adjustment cycle and a upper adjustment cycle, change thresholding with power and compare; If described difference is greater than described power, change thresholding, the RSSI according to signal in target RSSI and described current adjustment cycle, obtains the unsupported power variation in described current adjustment cycle; Or
The described unsupported power variation obtaining in current adjustment cycle comprises: obtain the RSSI of signal in described current adjustment cycle and the load information in described current adjustment cycle; Load information according in the RSSI of signal in described current adjustment cycle and described current adjustment cycle, obtains full load RSSI; According to target RSSI and described full load RSSI, obtain the unsupported power variation in described current adjustment cycle.
2. AGC Gain generating method according to claim 1, is characterized in that, described in obtain the RSSI of signal in described current adjustment cycle and comprise:
Obtain the symbol at a plurality of pilot tones place in signal in described current adjustment cycle;
The power corresponding to symbol at described a plurality of pilot tones place is added up, to obtain the RSSI of signal in described current adjustment cycle.
3. AGC Gain generating method according to claim 1, is characterized in that, described in the pilot power that obtains in described current adjustment cycle comprise:
Obtain the Resource Block at a plurality of pilot tones place in signal in described current adjustment cycle;
The power corresponding to Resource Block at described a plurality of pilot tones place is added up, to obtain the pilot power in described current adjustment cycle.
4. AGC Gain generating method according to claim 1, is characterized in that, described in the load information that obtains in described current adjustment cycle comprise:
By receiving high-level signaling message, obtain the load information in described current adjustment cycle.
5. according to the AGC Gain generating method described in claim 1-4 any one, it is characterized in that, the described gain of the AGC according to the unsupported power variation in described current adjustment cycle and described current adjustment cycle, the AGC gain that generates next adjustment cycle comprises:
The AGC gain of the unsupported power variation in described current adjustment cycle and described current adjustment cycle is added, generates the AGC gain of next adjustment cycle.
6. automatic gain is adjusted an AGC Gain generating device, it is characterized in that, comprising:
Variable quantity acquisition module, for obtaining the unsupported power variation in current adjustment cycle, described adjustment cycle comprises at least one subframe, the unsupported power variation in described current adjustment cycle refers to that the power that other factors produce except load changes;
Gain generating module, for according to the AGC gain of the unsupported power variation in described current adjustment cycle and described current adjustment cycle, generates the AGC gain of next adjustment cycle; The AGC gain of described next adjustment cycle is to change by the unsupported power variation in described current adjustment cycle being predicted as to the power that the factor except load variations in described next adjustment cycle causes, the AGC of described current adjustment cycle gained to adjust and obtain;
Wherein, described variable quantity acquisition module comprises: first obtains submodule, for obtaining the received signal strength indicator RSSI of signal in described current adjustment cycle; Second obtains submodule, for obtaining the pilot power in described current adjustment cycle; Comparison sub-module, for by the difference of the pilot power in the pilot power in described current adjustment cycle and a upper adjustment cycle, changes thresholding with power and compares; The 3rd obtains submodule, and while changing thresholding for be greater than described power in described difference, the RSSI according to signal in target RSSI and described current adjustment cycle, obtains the unsupported power variation in described current adjustment cycle; Or
Described variable quantity acquisition module comprises: the 5th obtains submodule, for obtaining the RSSI of signal in described current adjustment cycle; The 6th obtains submodule, for obtaining the load information in described current adjustment cycle; The 7th obtains submodule, for according to the load information in the RSSI of signal in described current adjustment cycle and described current adjustment cycle, obtains full load RSSI; The 8th obtains submodule, for according to target RSSI and described full load RSSI, obtains the unsupported power variation in described current adjustment cycle.
7. AGC Gain generating device according to claim 6, is characterized in that, described first obtains submodule comprises:
The first acquiring unit, for obtaining the symbol at a plurality of pilot tones place of signal in described current adjustment cycle;
Second acquisition unit, for adding up the power corresponding to symbol at described a plurality of pilot tones place, to obtain the RSSI of signal in described current adjustment cycle.
8. AGC Gain generating device according to claim 6, is characterized in that, described second obtains submodule comprises:
The 3rd acquiring unit, for obtaining the Resource Block at a plurality of pilot tones place of signal in described current adjustment cycle;
The 4th acquiring unit, for adding up the power corresponding to Resource Block at described a plurality of pilot tones place, to obtain the pilot power in described current adjustment cycle.
9. AGC Gain generating device according to claim 6, is characterized in that, the described the 6th obtains submodule specifically obtains the load information in described current adjustment cycle by receiving high-level signaling message.
10. according to the AGC Gain generating device described in claim 6-9 any one, it is characterized in that, described Gain generating module, specifically for the AGC gain of the unsupported power variation in described current adjustment cycle and described current adjustment cycle is added, generates the AGC gain of next adjustment cycle.
11. 1 kinds of automatic gains are adjusted AGC Gain generating method, it is characterized in that, comprising:
According to the AGC gain of the received signal strength indicator RSSI of signal in current adjustment cycle and current adjustment cycle, generate antenna opening power, described current adjustment cycle comprises at least one subframe, and described antenna opening power is for representing the actual RSSI of the radio frequency unit of communication control processor signal that export, that be about to input analog-to-digital converter ADC and the difference of desirable RSSI;
With predefined target RSSI, deduct described antenna opening power, obtain the AGC gain of next adjustment cycle.
12. AGC Gain generating methods according to claim 11, is characterized in that, the described gain of the AGC according to the received signal strength indicator RSSI of signal in current adjustment cycle and front adjustment cycle, generates antenna opening power and also comprise before:
Obtain the symbol at a plurality of pilot tones place in signal in described current adjustment cycle;
The power corresponding to symbol at described a plurality of pilot tones place is added up, obtain the RSSI of signal in described current adjustment cycle.
13. 1 kinds of automatic gains are adjusted AGC Gain generating device, it is characterized in that, comprising:
Power generation module, for gaining according to the AGC of the received signal strength indicator RSSI of signal in current adjustment cycle and current adjustment cycle, generate antenna opening power, described current adjustment cycle comprises at least one subframe, and described antenna opening power is for representing the actual RSSI of the radio frequency unit of communication control processor signal that export, that be about to input analog-to-digital converter ADC and the difference of desirable RSSI;
Gain acquisition module, for deduct described antenna opening power with predefined target RSSI, obtains the AGC gain of next adjustment cycle.
14. AGC Gain generating devices according to claim 13, is characterized in that, also comprise:
Symbol acquisition module, for obtaining the symbol at a plurality of pilot tones place of signal in described current adjustment cycle;
Signal strength signal intensity acquisition module, for the power corresponding to symbol at described a plurality of pilot tones place is added up, obtains the RSSI of signal in described current adjustment cycle.
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| CN102820898B (en) * | 2012-07-16 | 2015-04-08 | 深圳市海思半导体有限公司 | Gain regulation method and equipment |
| CN103391142A (en) * | 2013-07-24 | 2013-11-13 | 福建星网锐捷网络有限公司 | Method and device for determining RSSI value of channel, and access point equipment |
| CN103558897B (en) * | 2013-11-18 | 2015-05-06 | 梁淮宁 | Virtual-gain-bridge-based automatic gain control method |
| CN104320211B (en) * | 2014-10-13 | 2017-01-18 | 大唐移动通信设备有限公司 | IOT (Interference Over Thermal) data output method and device |
| CN106817757B (en) * | 2015-11-30 | 2019-07-19 | 展讯通信（上海）有限公司 | The calibration method and device of transmission power |
| CN110312300B (en) * | 2019-05-13 | 2022-06-28 | 展讯通信（上海）有限公司 | Control method, control device and storage medium |
| CN111988838B (en) * | 2019-05-23 | 2024-06-11 | 中兴通讯股份有限公司 | Automatic gain control implementation method and device and storage medium |
| CN116865940B (en) * | 2023-07-19 | 2024-06-21 | 东方空间技术(山东)有限公司 | Antenna feed gain control method, computing device and storage medium |
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