CN103188787A - Automatic gain control method and device - Google Patents
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Abstract
The invention relates to the technical field of mobile communication and discloses an automatic gain control method and a device. On the basis of guaranteeing timeliness and cost of automatic gain control, the automatic gain control method and the device are used for improving performance of the automatic gain control. The automatic gain control method comprises the following steps: capturing system configuration information and corresponding characteristics, determining gain switching time of AGC according to the system configuration information and the corresponding characteristics, counting symbol level time-frequency domain metrical information between the current gain switching time and the next gain switching time, the symbol level time frequency domain metrical information comprises frequency domain power Pw of default resource unit location in various symbols and time domain power Psymbol of the various symbols, comparing the symbol level time frequency domain metrical information with an adaptive gain control target value, obtaining a logarithmic domain difference value, and according to the logarithmic domain difference value, completing gain switching of the automatic gain control at the next gain switching time.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of auto gain control method and device.
Background technology
Mobile communication system is because the influence of factors such as the communicating pair physical distance is variable, wireless channel complexity, the professional living variation of going out, the dynamic range of signal is bigger usually, (be called for short with 3rd Generation Partnership Project, 3GPP) Long Term Evolution (is called for short, LTE) system is example, standard signal dynamic range-25dBm～-106dBm, dynamically span is up to 81dB.Need to prove that this dynamic range may embody greatlyyer in the practical application, it has been generally acknowledged that the level that can reach about 90～95dB.
For the signal of tackling described great dynamic range receives, (be called for short, AGC) technology is widely used in automatic gain control.The method that the receiving circuit of using this technology is taked to preset is adjusted multiplication factor, to the amplification that gains greatly of input signal by a small margin, signal is significantly carried out little gain to be amplified or does not amplify, thereby great dynamic range is received signal limiting to a less dynamic range, reduce the design difficulty of follow-up signal processing apparatus.
(owing to be the multicarrier system that possesses the high availability of frequency spectrum, the peak-to-average force ratio that receives signal has reached unprecedented height for abbreviation, OFDM) mobile communication system for OFDM; Further, because flexibility of resource allocation far is better than time division multiple access, code division multiple access system, the physical channel life is gone out, the occurrence frequency of resource distributing altering is also higher, makes the automatic gain control of OFDM mobile communication system have higher difficulty.
Be the OFDM (abbreviation of representative with international monopoly WO2008137837 " Automatic Gain Control Circuit for MIMOOFDM Receiver ", US Patent No. 797066B1 " Tracking Automatic Gain Control ofOFDM Systems ", Chinese patent CN200610160846.7 " auto gain control method and the equipment that are used for wireless communication system ", OFDM) automatic gain of system control scheme, all disclosing with the OFDM symbol is the automatic gain control logic of minimum time unit, and exemplary process mechanism is as follows:
1, capture systems is synchronous, follows the tracks of with the computation cycles prefix and (is called for short CP) Ju Bu power level;
2, the power level that described calculating is obtained compares with the expectation power level, obtains the log-domain difference value;
3, based on specific control strategy, according to described log-domain difference value, before arriving, the CP of OFDM symbol end, valid data finish renewal and the setting of automatic gain control.
The inventor finds that there are the following problems with not enough for above-mentioned existing automatic gain control processing logic:
1, because corresponding scheme need be finished power measurement, automatic gain control circuit setting and task such as stable at CP in the time, to radio circuit require highly, must increase the cost of radio circuit;
Be example with 3GPP LTE system, the shortest only not enough 4.7us of CP, consideration is evaded and sample time and processing time of power measurement the expansion of last symbol time delay, leave over setting and stabilization time even not enough 2us to radio circuit, so limited radio frequency setting and may cause the high cost of radio circuit stabilization time perhaps can't be finished at all;
2, because the different OFDM symbols of corresponding scheme are set to different gains, different gains may cause the intersymbol SPA sudden phase anomalies of different OFDM, severe exacerbation receiver performance
General, the channel estimating of ofdm system relies on certain rule and places the reference signal of symbol specific subcarrier (or to claim, the benchmark subcarrier), reference signal is distributed among the different OFDM symbols usually, and each reference signal is obtained the channel estimating of each each subcarrier of symbol by collaborative process such as time domain/frequency domain interpolations; In the AGC of routine control scheme, different OFDM intersymbols will be because the gain change will be introduced SPA sudden phase anomalies, and aforementioned channels estimation activity is owing to relate to intersymbol cooperation, and its performance will be subjected to remarkable deterioration inevitably.For resisting the conspicuousness loss of energy that the respective phase sudden change is introduced, it is the phase correction scheme of representative that industry has proposed with US Patent No. 7889820B2 " Phase Compensation for Analog Gain Switching in OFDMModulation Physical Channel " again, this programme newly-increased class automatic frequency control module when the valid data of each symbol that change in gain takes place partly receive is implemented SPA sudden phase anomalies and is corrected, resist the SPA sudden phase anomalies that change in gain is introduced, thereby evade it to the receiver Effect on Performance; Phase correction module and respective handling that this solution is newly-increased will promote receiver complexity and cost greatly but simultaneously.
Summary of the invention
The embodiment of the invention provides a kind of auto gain control method and device, is used for the basis of and cost ageing in the control of assurance automatic gain, promotes the performance of automatic gain control.
The embodiment of the invention provides a kind of auto gain control method, comprising:
Capture systems configuration information and individual features are determined the gain switching instant that automatic gain control AGC controls according to described system configuration information and individual features; Add up the symbol level time-frequency domain metrical information between current and next gain switching instant, described symbol level time-frequency domain metrical information comprises the frequency domain power P w of default Resource Unit position in each symbol and the time domain power P symbol of each symbol, described symbol level time-frequency domain metrical information and adaptive gain control desired value are compared, obtain the log-domain difference value; According to described log-domain difference value, switch in the gain that described next gain switching instant is finished automatic gain control.
Preferably, described gain switching instant comprises fixedly switching instant and/or condition switching instant, and described fixedly switching instant refers to the moment that intrinsic generation gain is switched, described condition switching instant when satisfying switching condition, the moment that the gain switching takes place.
Preferably, described fixedly switching instant is positioned at the switching point position of the up-downlink direction conversion of TDD ofdm system.
Preferably, described fixedly switching instant is positioned at the original position of ofdm system radio frames.
Preferably, described condition switching instant is the set of following any condition moment corresponding or multiple condition moment corresponding: when ofdm system worked in the wave beam forming scene, described condition switching instant was positioned at the original position of each descending sub frame; When network at current descending sub frame during not to the terminal scheduling mandate, described condition switching instant is not later than T
z-(T
Settle-T
CP) time point, wherein, T
zBe described subframe end time point, T
SettleFor stabilization time, T are upgraded in gain
CPBe the CP duration; When gain is upgraded stabilization time during smaller or equal to the CP duration, i.e. T
Settle≤ T
CPThe time, described condition switching instant is positioned at the CP terminal point of each descending OFDM symbol and recalls T forward
CP-T
Settle
Preferably, described default Resource Unit position comprises: when network side worked in non-wave beam forming state, described default Resource Unit position was conventional reference signal Resource Unit of living in; When network side worked in the wave beam forming state, described default Resource Unit position was conventional reference signal and/or is used for the reference signal Resource Unit of living in that wave beam forming instructs.
Preferably, described symbol level time-frequency domain metrical information and adaptive gain control desired value are compared, obtain the log-domain difference value and comprise: the frequency domain power P w ' after deducing by the frequency domain power P w acquisition of default Resource Unit position in described each symbol; Frequency domain power P w ' after the described deduction is converted to time domain power P rs_symbol; Choose the higher value of the time domain power P symbol of described time domain power P rs_symbol and described each symbol, compare with adaptive gain control desired value, obtain the log-domain difference value.
Preferably, the frequency domain power P w ' after described frequency domain power P w by default Resource Unit position in described each symbol obtains to deduce is any of following mode: the frequency domain power P w ' that deduces out the system works full bandwidth by the frequency domain power P w of default Resource Unit position in described each symbol; The frequency domain power P w ' that frequency domain power P w by default Resource Unit position in described each symbol deduces out the distribution bandwidth.
Preferably, the described higher value of choosing the time domain power P symbol of described time domain power P rs_symbol and described each symbol be following mode any: choose the higher value between the maximum of the maximum of time domain power P symbol of described each symbol and described time domain power P rs_symbol; Choose the higher value between the average of the average of time domain power P symbol of described each symbol and described time domain power P rs_symbol.
Preferably, described adaptive gain control desired value is any of following mode: the received power of receiver linear work district intermediate value correspondence; The received power of correspondence during apart from the default NdB of receiver linear work district peak, wherein, described N be among professional peak-to-average force ratio N1, decline protective number N2 or the Additional Protection amount N3 any one or multiple and.
Preferably, described professional peak-to-average force ratio N1 is calculated by the corresponding number of subcarriers of bandwidth of operation and obtains; Or by the corresponding number of subcarriers actual measurement acquisition of bandwidth of operation.
Preferably, described decline protective number be following mode any: calculated by the channel type estimated result to obtain; Be each intersymbol time domain in the current gain control cycle and/or frequency domain power limit difference value, described current gain control cycle is described current and next gain time between switching instant.
Preferably, described Additional Protection amount comprises chugging protection value.
The embodiment of the invention provides a kind of automatic gain control equipment, comprise: gain switching instant recognition unit, be used for capture systems configuration information and individual features, determine the gain switching instant of automatic gain control AGC control according to described system configuration information and individual features; Log-domain difference value acquiring unit, be used for adding up the symbol level time-frequency domain metrical information between current and next gain switching instant, described symbol level time-frequency domain metrical information comprises the frequency domain power P w of default Resource Unit position in each symbol and the time domain power P symbol of each symbol, described symbol level time-frequency domain metrical information and adaptive gain control desired value are compared, obtain the log-domain difference value; Gain control unit is used for according to described log-domain difference value, switches in the gain that described next gain switching instant is finished automatic gain control.
Preferably, described log-domain difference value acquiring unit further comprises: deduce module, be used for by the frequency domain power P w ' after the frequency domain power P w acquisition deduction of the default Resource Unit position of described each symbol; Modular converter is used for the frequency domain power P w ' after the described deduction is converted to time domain power P rs_symbol; Acquisition module for the higher value of the time domain power P symbol that chooses described time domain power P rs_symbol and described each symbol, compares with adaptive gain control desired value, obtains the log-domain difference value.
Preferably, described log-domain difference value acquiring unit further comprises adaptive gain control desired value acquisition module, be used for being obtained from adapting to gain and control desired value, described adaptive gain control desired value is any of following mode: the received power of receiver linear work district intermediate value correspondence; The received power of correspondence during apart from the default NdB of receiver linear work district peak, wherein, described N be among professional peak-to-average force ratio N1, decline protective number N2 or the Additional Protection amount N3 any one or multiple and.
Method and the device of the automatic gain control that provides by the embodiment of the invention, gain switching instant to automatic gain control has been implemented intrinsic or term restriction, guaranteeing as far as possible on the ageing basis of AGC control, effectively evading the SPA sudden phase anomalies of gain switching introducing to the baneful influence of receiver performance; On the time-domain signal Fundamentals of Measurement of prior art, utilize the default cell position of frequency domain to measure, and deduce based on suitable power and to be converted to time domain power, instruct AGC gain control to upgrade, significantly strengthen the signal life and gone out, dispose the robustness that scenario A GC such as sudden change controls; Simultaneously, the time domain power of time domain measurement power and conversion is taken all factors into consideration, evaded default cell position and measure the uncontrollable scene of deduction to the performance impact of AGC control.Further, the acquisition methods of the adaptive gain of employing control desired value, compared with prior art, operate by self adaptation, effectively cooperate gain control switching cycle, make operation of receiver in the high bit in linear work district, the control quantization error is to the deterioration of performance.Finally reach on the basis of and cost ageing in the control of assurance automatic gain, promote the effect of the performance of automatic gain control.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, to those skilled in the art, can also obtain other accompanying drawing according to these accompanying drawings.
A kind of auto gain control method schematic diagram that Fig. 1 provides for the embodiment of the invention;
A kind of automatic gain control equipment schematic diagram that Fig. 2 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of auto gain control method and device, is used for the basis of and cost ageing in the control of assurance automatic gain, promotes the performance of automatic gain control.
For make goal of the invention of the present invention, feature, advantage can be more obvious and understandable, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, the embodiments described below only are the present invention's part embodiment, but not whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those skilled in the art obtains belongs to the scope of protection of the invention.
The auto gain control method that the embodiment of the invention provides as shown in Figure 1, comprising:
S101, capture systems configuration information and individual features are determined the gain switching instant that automatic gain control AGC controls according to system configuration information and individual features;
Wherein, system configuration information comprises: ofdm communication system type, duplex mode and mode of operation; Individual features comprises: frame structure and cyclic prefix CP duration.
In embodiments of the present invention, duplex mode is that time division duplex (is called for short, TDD).
In embodiments of the present invention, the gain switching instant comprises fixedly switching instant and/or condition switching instant, and fixedly switching instant refers to the moment that intrinsic generation gain is switched, the condition switching instant when satisfying switching condition, the moment of the switching that takes place to gain.In the practical application, can obtain follow-up a plurality of gain switching instants according to system configuration information and individual features, can be chosen in separately fixedly that switching instant switches or switches at the condition switching instant, also can be in that fixedly switching instant and condition switching instant all switch.The gain switching instant of the AGC control of namely determining may be fixing switching instant, also may be the condition switching instant.Simultaneously, the embodiment of the invention can only obtain three initial gain switching instants, switch in the gain that second gain switching instant finished automatic gain control, obtain adaptive gain control desired value by the gain control cycle between second and the 3rd gain switching instant.
Preferably, fixedly switching instant is positioned at the switching point position of the up-downlink direction conversion of TDD ofdm system.
Preferably, fixedly switching instant is positioned at the original position of ofdm system radio frames.
In embodiments of the present invention, fixedly switching instant appears at the original position of ofdm system radio frames with scheduled time of the corresponding durations of one or more radio frames.
In embodiments of the present invention, the condition switching instant is the set of following any condition moment corresponding or multiple condition moment corresponding:
A1, when ofdm system works in the wave beam forming scene, the condition switching instant is positioned at the original position of each descending sub frame;
A2, when network at current descending sub frame during not to the terminal scheduling mandate, the condition switching instant is not later than T
z-(T
Settle-T
CP) time point, wherein, T
zBe described subframe end time point, T
SettleFor stabilization time, T are upgraded in gain
CPBe the CP duration, because T
SettleAnd T
CPBetween magnitude relationship indefinite, T
Settle-T
CPMay be honest also possibility negative value, namely the condition switching instant is not later than subframe end time point T forward or backward
Settle-T
CPTime;
A3, upgrade stabilization time during smaller or equal to the CP duration when gain, i.e. T
Settle≤ T
CPThe time, wherein, T
SettleFor stabilization time, T are upgraded in gain
CPBe the CP duration, the condition switching instant is positioned at the CP terminal point of each descending OFDM symbol and recalls T forward
CP-T
Settle
Need to prove that above-mentioned condition switching instant can be one of them condition moment corresponding, also can be the set of two or three condition moment corresponding arbitrarily.When gain is upgraded stabilization time during smaller or equal to the CP duration, because in the condition of A3, the CP terminal point of each descending OFDM symbol is recalled T forward
CP-T
SettleSwitching instant contained when ofdm system works in the wave beam forming scene, the original position of each descending sub frame and when network at current descending sub frame during not to the terminal scheduling mandate, described condition switching instant is not later than the end of described subframe and recalls T forward
Settle-T
CPThe condition switching instant of stabilization time during smaller or equal to the CP duration upgraded in the gain of being taken in of switching instant under these two kinds of conditions, historical facts or anecdotes matter, is and satisfies A3 condition moment corresponding.When gain is upgraded stabilization time during greater than the CP duration owing to can't satisfy the A3 condition, so the time the condition switching instant for satisfying A1 or A2 condition moment corresponding, or satisfy the set of A1 or A2 condition moment corresponding.
S102, statistics is current and the symbol level time-frequency domain metrical information of next gain between switching instant, symbol level time-frequency domain metrical information comprises the frequency domain power P w of default Resource Unit position in each symbol and the time domain power P symbol of each symbol, symbol level time-frequency domain metrical information and adaptive gain control desired value are compared, obtain the log-domain difference value;
In embodiments of the present invention, symbol level time-frequency domain metrical information is that unit receives business datum with the subframe, and each reception antenna independently calculates the symbol level time-frequency domain metrical information that obtains each each symbol of subframe.
In embodiments of the present invention, default Resource Unit position comprises one of following two kinds of situations:
When network side worked in non-wave beam forming state, default Resource Unit position was conventional reference signal Resource Unit of living in;
When network side worked in the wave beam forming state, default Resource Unit position was conventional reference signal and/or is used for the reference signal Resource Unit of living in that wave beam forming instructs.
Preferably, conventional reference signal is the residential quarter designated reference signal of 3GPP LTE system; The reference signal that is used for the wave beam forming guidance is user's designated reference signal of 3GPP LTE system.
In embodiments of the present invention, the purpose of obtaining symbol level time-frequency domain metrical information simultaneously is, avoid existing and obtain the factor that the frequency domain power measurement can't be looked after merely, comprise control class channel resource cell power and factors such as reference signal power difference is excessive, wave beam forming gain, part wave beam forming scene.
Preferably, symbol level time-frequency domain metrical information and adaptive gain control desired value are compared, obtain the log-domain difference value and further comprise:
Frequency domain power P w ' after B1, the frequency domain power P w by default Resource Unit position in each symbol obtain to deduce;
B2, the frequency domain power P w ' after will deducing are converted to time domain power P rs_symbol;
B3, choose the higher value of the time domain power P symbol of time domain power P rs_symbol and each symbol, compare with adaptive gain control desired value, obtain the log-domain difference value.
Preferably, step B1 further is following any mode:
B11, deduce out the frequency domain power P w ' of system works full bandwidth by the frequency domain power P w of default Resource Unit position in each symbol;
In embodiments of the present invention, preferably deducing formula is:
Pw’＝Pw*RE
BW/RE
RS
Wherein, Pw ' is the frequency domain power of the system works full bandwidth of deducing out, and Pw be the frequency domain power of presetting the Resource Unit position in each symbol, RE
BWBe the Resource Unit number of full bandwidth, RE
RSBe default Resource Unit number;
The frequency domain power P w ' that B12, the frequency domain power P w by default Resource Unit position in each symbol deduce out the distribution bandwidth.
In the present embodiment, preferably deducing formula is:
Pw’＝Pw*RE
BWassign/RE
RS，
Wherein, Pw ' is the frequency domain power of the distribution bandwidth deduced out, and Pw be the frequency domain power of presetting the Resource Unit position in each symbol, RE
BWassignFor distributing the Resource Unit number of bandwidth, RE
RSBe default Resource Unit number, distribute bandwidth to be described default resource place bandwidth, when even default Resource Unit position was reference signal Resource Unit of living in, distributing bandwidth was reference signal place bandwidth.
Preferably, for the accuracy of the frequency domain power that guarantees to deduce out, in embodiments of the present invention, also need to consider the power difference of default Resource Unit and non-default Resource Unit, the frequency domain power of deducing out is revised.Wherein, non-default Resource Unit comprises: reserved resource unit, data resource unit and control channel Resource Unit.
In embodiments of the present invention, a kind of modification method is to utilize the non-default Resource Unit of precognition and the power difference of default Resource Unit that the frequency domain power of deducing out is revised: Pw '=Pw*RE
BW/ RE
RS* Modi or Pw '=Pw+Pw* (RE
BW-RE
RS)/RE
RS* Modi, wherein, Modi is the non-default Resource Unit of precognition and the power difference of default Resource Unit.
Another kind of modification method is revised the frequency domain power of deducing out for utilizing the non-default Resource Unit that trains and the power difference of default Resource Unit.
In embodiments of the present invention, the frequency domain power transfer among the step B2 can be with reference to the parseval relational expression for time domain power:
Drawing frequency domain power P w ' after the deduction and time domain power P rs_symbol closes and is:
Prs_symbol=Pw '/2/pi, wherein Prs_symbol is time domain power, Pw ' is frequency domain power;
Preferably, in the B3 step, the higher value of choosing the time domain power P symbol of time domain power P rs_symbol and described each symbol can obtain by following dual mode:
Choose the higher value between the maximum of the maximum of time domain power P symbol of each symbol and time domain power P rs_symbol;
Or choose higher value between the average of the average of time domain power P symbol of each symbol and time domain power P rs_symbol.
In embodiments of the present invention, adaptive gain control desired value comprises following a kind of among the step B3:
The received power of receiver linear work district intermediate value correspondence;
Or the received power of correspondence during apart from the default NdB of receiver linear work district peak; wherein; N be among professional peak-to-average force ratio N1, decline protective number N2 or the Additional Protection amount N3 any one or multiple and, namely N can be N1 or N2 or N3 or N1+N2 or N1+N3 or N2+N3 or N1+N2+N3.In embodiments of the present invention, take all factors into consideration multiple situation, preferably, N=N1+N2+N3.
Described professional peak-to-average force ratio N1 is calculated by the corresponding number of subcarriers of bandwidth of operation and obtains, or obtained by the corresponding number of subcarriers actual measurement of bandwidth of operation.
Preferably, in embodiments of the present invention, professional peak-to-average force ratio N1 can (be called for short, CDF): P{PAR≤z}=(1-e according to the cumulative distribution function of OFDM symbol
-z)
NCalculate to obtain that wherein, PAR is peak-to-average force ratio, the peak-to-average force ratio thresholding of z for arranging, N is number of subcarriers; Professional peak-to-average force ratio N1 value is to make the CDF value equal the z of probability P, P span 0.9～1.
Preferably, the decline protective number is that following any mode obtains:
Calculate acquisition by the channel type estimated result;
Or be each intersymbol time domain and/or frequency domain power limit difference value in the current gain control cycle, be the time between current gain switching instant and next the gain switching instant in the current gain control cycle.
In embodiments of the present invention, calculate that by the channel type estimated result obtaining weak protective number is preferably: define according to the channel envelope degree of correlation
J wherein
0() is first kind zero Bessel function; f
mBe maximum doppler frequency; Δ t is the time interval;
Then in embodiments of the present invention, the log-domain value of the channel envelope degree of correlation that calculates for time interval of the maximum doppler frequency by the channel type estimated result and next gain control cycle of decline protective number value.
In embodiments of the present invention, the Additional Protection amount comprises chugging protection value.For example pass in and out shadow region, turnover elevator cage, pass in and out the chugging that carriage causes.
In embodiments of the present invention, the acquisition methods of adaptive gain control desired value, compared with prior art, operate by self adaptation, effectively cooperate the gain control cycle, make operation of receiver in the high bit in linear work district, the control quantization error is to the deterioration of performance; Further, by increasing the chugging protection, effectively promoted the robustness of automatic gain control.
S103, according to the log-domain difference value, switch in the gain that described next gain switching instant is finished automatic gain control.
In embodiments of the present invention, finish the gain switching of automatic gain control at next gain switching instant after, in this moment capture systems configuration information and individual features, determine the gain switching instant that new automatic gain is controlled according to system configuration information and individual features, carry out new automatic gain control.
In embodiments of the present invention, implemented intrinsic or term restriction to the gain switching instant of automatic gain control, guaranteed as far as possible on the ageing basis of AGC control, effectively evaded the SPA sudden phase anomalies of gain switching introducing to the baneful influence of receiver performance; On the time-domain signal Fundamentals of Measurement of prior art, utilize the default cell position of frequency domain to measure, and deduce based on suitable power and to be converted to time domain power, instruct AGC gain control to upgrade, significantly strengthen the signal life and gone out, dispose the robustness that scenario A GC such as sudden change controls; Simultaneously, the time domain power of time domain measurement power and conversion is taken all factors into consideration, evaded default cell position and measure the uncontrollable scene of deduction to the performance impact of AGC control.Simultaneously, the acquisition methods of adaptive gain control desired value compared with prior art, by the self adaptation operation, effectively cooperates gain control switching cycle, makes operation of receiver in the high bit in linear work district, and the control quantization error is to the deterioration of performance.
Next introduce the corresponding device of method that the embodiment of the invention provides, as shown in Figure 2, comprising:
Gain switching instant recognition unit is used for capture systems configuration information and individual features, determines the gain switching instant of automatic gain control AGC control according to system configuration information and individual features;
Log-domain difference value acquiring unit, be used for adding up the symbol level time-frequency domain metrical information between current and next gain switching instant, symbol level time-frequency domain metrical information comprises the frequency domain power P w of default Resource Unit position in each symbol and the time domain power P symbol of each symbol, symbol level time-frequency domain metrical information and adaptive gain control desired value are compared, obtain the log-domain difference value;
Gain control unit is used for according to the log-domain difference value, and the gain of finishing automatic gain control at next gain switching instant is switched.
In embodiments of the present invention, log-domain difference value acquiring unit further comprises:
Deduce module, the frequency domain power P w ' after obtaining to deduce for the frequency domain power P w by the default Resource Unit position of each symbol;
Modular converter, the frequency domain power P w ' after being used for deducing is converted to time domain power P rs_symbol;
Acquisition module for the higher value of the time domain power P symbol that chooses time domain power P rs_symbol and each symbol, compares with adaptive gain control desired value, obtains the log-domain difference value.
In embodiments of the present invention,, log-domain difference value acquiring unit further comprises adaptive gain control desired value acquisition module, adaptive gain control desired value comprises:
The received power of receiver linear work district intermediate value correspondence;
Or the received power of correspondence during apart from the default NdB of receiver linear work district peak, wherein, N be among professional peak-to-average force ratio N1, decline protective number N2 or the Additional Protection amount N3 any one or multiple and.
In embodiments of the present invention, gain switching instant recognition unit limits the gain switching instant of automatic gain control, guaranteeing as far as possible on the ageing basis of AGC control, effectively evading the SPA sudden phase anomalies of gain switching introducing to the baneful influence of receiver performance; Log-domain difference value acquiring unit is on the time-domain signal Fundamentals of Measurement of prior art, utilize the default cell position of frequency domain to measure, and deduce based on suitable power and to be converted to time domain power, instruct AGC gain control to upgrade, significantly strengthened the signal life and gone out, dispose the robustness of scenario A GC controls such as sudden change; Simultaneously, the time domain power of time domain measurement power and conversion is taken all factors into consideration, evaded default cell position and measure the uncontrollable scene of deduction to the performance impact of AGC control.Simultaneously, the embodiment of the invention also comprises adaptive gain control desired value acquisition module, compared with prior art, can operate by self adaptation, effectively cooperate gain control switching cycle, make operation of receiver in the high bit in linear work district, the control quantization error is to the deterioration of performance.
Those of ordinary skill in the art is obviously clear and understand, the present invention for above embodiment only be used for explanation the present invention, and be not limited to the present invention.Though effectively described the present invention by embodiment, those of ordinary skills know that there are many variations in the present invention and do not break away from spirit of the present invention.Under the situation that does not deviate from spirit of the present invention and essence thereof, those skilled in the art work as can make various corresponding changes or distortion according to the present invention, but these corresponding changes or distortion all belong to claim protection range of the present invention.
Claims (16)
1. an auto gain control method is characterized in that, comprising:
Capture systems configuration information and individual features are determined the gain switching instant that automatic gain control AGC controls according to described system configuration information and individual features;
Add up the symbol level time-frequency domain metrical information between current and next gain switching instant, described symbol level time-frequency domain metrical information comprises the frequency domain power P w of default Resource Unit position in each symbol and the time domain power P symbol of each symbol, described symbol level time-frequency domain metrical information and adaptive gain control desired value are compared, obtain the log-domain difference value;
According to described log-domain difference value, switch in the gain that described next gain switching instant is finished automatic gain control.
2. the method for claim 1, it is characterized in that, described gain switching instant comprises fixedly switching instant and/or condition switching instant, described fixedly switching instant refers to the moment that intrinsic generation gain is switched, the moment that gain is switched takes place when satisfying switching condition in described condition switching instant.
3. method as claimed in claim 2 is characterized in that, described fixedly switching instant is positioned at the switching point position of the up-downlink direction conversion of TDD ofdm system.
4. method as claimed in claim 2 is characterized in that, described fixedly switching instant is positioned at the original position of ofdm system radio frames.
5. method as claimed in claim 2 is characterized in that, described condition switching instant is the set of following any condition moment corresponding or multiple condition moment corresponding:
When ofdm system worked in the wave beam forming scene, described condition switching instant was positioned at the original position of each descending sub frame;
When network at current descending sub frame during not to the terminal scheduling mandate, described condition switching instant is not later than T
z-(T
Settle-T
CP) time point, wherein, T
zBe described subframe end time point, T
SettleFor stabilization time, T are upgraded in gain
CPBe the CP duration;
When gain is upgraded stabilization time during smaller or equal to the CP duration, i.e. T
Settle≤ T
CPThe time, described condition switching instant is positioned at the CP terminal point of each descending OFDM symbol and recalls T forward
CP-T
Settle
6. the method for claim 1 is characterized in that, described default Resource Unit position comprises:
When network side worked in non-wave beam forming state, described default Resource Unit position was conventional reference signal Resource Unit of living in;
When network side worked in the wave beam forming state, described default Resource Unit position was conventional reference signal and/or is used for the reference signal Resource Unit of living in that wave beam forming instructs.
7. the method for claim 1 is characterized in that, described symbol level time-frequency domain metrical information and adaptive gain control desired value are compared, and obtains the log-domain difference value and comprises:
By the frequency domain power P w ' after the frequency domain power P w acquisition deduction of default Resource Unit position in described each symbol;
Frequency domain power P w ' after the described deduction is converted to time domain power P rs_symbol;
Choose the higher value of the time domain power P symbol of described time domain power P rs_symbol and described each symbol, compare with adaptive gain control desired value, obtain the log-domain difference value.
8. method as claimed in claim 7 is characterized in that, the frequency domain power P w ' after described frequency domain power P w by default Resource Unit position in described each symbol obtains to deduce is any of following mode:
Deduce out the frequency domain power P w ' of system works full bandwidth by the frequency domain power P w of default Resource Unit position in described each symbol;
The frequency domain power P w ' that frequency domain power P w by default Resource Unit position in described each symbol deduces out the distribution bandwidth.
9. method as claimed in claim 7 is characterized in that, the described higher value of choosing the time domain power P symbol of described time domain power P rs_symbol and described each symbol is any of following mode:
Choose the higher value between the maximum of the maximum of time domain power P symbol of described each symbol and described time domain power P rs_symbol;
Choose the higher value between the average of the average of time domain power P symbol of described each symbol and described time domain power P rs_symbol.
10. method as claimed in claim 7 is characterized in that, described adaptive gain control desired value is any of following mode:
The received power of receiver linear work district intermediate value correspondence;
The received power of correspondence during apart from the default NdB of receiver linear work district peak, wherein, described N be among professional peak-to-average force ratio N1, decline protective number N2 or the Additional Protection amount N3 any one or multiple and.
11. method as claimed in claim 10 is characterized in that, described professional peak-to-average force ratio N1 is calculated by the corresponding number of subcarriers of bandwidth of operation and obtains; Or by the corresponding number of subcarriers actual measurement acquisition of bandwidth of operation.
12. method as claimed in claim 10 is characterized in that, described decline protective number is any of following mode:
Calculate acquisition by the channel type estimated result;
Be each intersymbol time domain in the current gain control cycle and/or frequency domain power limit difference value, described current gain control cycle is described current and next gain time between switching instant.
13. method as claimed in claim 10 is characterized in that, described Additional Protection amount comprises chugging protection value.
14. an automatic gain control equipment is characterized in that, comprising:
Gain switching instant recognition unit is used for capture systems configuration information and individual features, determines the gain switching instant of automatic gain control AGC control according to described system configuration information and individual features;
Log-domain difference value acquiring unit, be used for adding up the symbol level time-frequency domain metrical information between current and next gain switching instant, described symbol level time-frequency domain metrical information comprises the frequency domain power P w of default Resource Unit position in each symbol and the time domain power P symbol of each symbol, described symbol level time-frequency domain metrical information and adaptive gain control desired value are compared, obtain the log-domain difference value;
Gain control unit is used for according to described log-domain difference value, switches in the gain that described next gain switching instant is finished automatic gain control.
15. device as claimed in claim 14 is characterized in that, described log-domain difference value acquiring unit further comprises:
Deduce module, be used for by the frequency domain power P w ' after the frequency domain power P w acquisition deduction of the default Resource Unit position of described each symbol;
Modular converter is used for the frequency domain power P w ' after the described deduction is converted to time domain power P rs_symbol;
Acquisition module for the higher value of the time domain power P symbol that chooses described time domain power P rs_symbol and described each symbol, compares with adaptive gain control desired value, obtains the log-domain difference value.
16. device as claimed in claim 15, it is characterized in that, described log-domain difference value acquiring unit further comprises adaptive gain control desired value acquisition module, is used for being obtained from adapting to gain control desired value, and described adaptive gain control desired value is any of following mode:
The received power of receiver linear work district intermediate value correspondence;
The received power of correspondence during apart from the default NdB of receiver linear work district peak, wherein, described N be among professional peak-to-average force ratio N1, decline protective number N2 or the Additional Protection amount N3 any one or multiple and.
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