CN102348271B - Wireless communication terminal and automatic gain control method - Google Patents

Wireless communication terminal and automatic gain control method Download PDF

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CN102348271B
CN102348271B CN201010244285.5A CN201010244285A CN102348271B CN 102348271 B CN102348271 B CN 102348271B CN 201010244285 A CN201010244285 A CN 201010244285A CN 102348271 B CN102348271 B CN 102348271B
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automatic gain
gain control
control unit
yield value
wireless communication
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CN102348271A (en
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严闳中
孙刚
颜智
王昕�
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Fujitsu Ltd
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Abstract

The invention provides a wireless communication terminal and an automatic gain control method. The wireless communication terminal comprises an automatic gain control unit arranged to carry out automatic gain control on receiving signals of the wireless communication terminal, a clearance control unit arranged to control the start and end of clearance, a clearance operation determining unit arranged to determine operations to be carried out in the next clearance, and a mode control unit arranged to set the mode of the automatic gain control unit in the next clearance according to the determined operations.

Description

Wireless communication terminal and auto gain control method
Technical field
The application relates to radio communication, and the automatic gain relating in particular in time division duplex (TDD) wireless communication system is controlled (AGC).
Background technology
In wireless communication terminal, due to the fading effect (path loss, shadow fading, multipath fading etc.) of wireless channel, and the variation of business load, can cause the significantly variation dynamically of the amplitude and power that receives signal.The signal quantization distortion that can cause for the larger signal of this dynamic range, is generally used automatic gain to control (Automatic gain control, AGC) technology and solves.Under the prerequisite of word length that does not increase analog to digital converter (Analog to Digital Converter, ADC), the signal of great dynamic range is adjusted into automatically to the dynamic range that is suitable for ADC word length, reduce quantizing distortion.Another benefit that adopts AGC technology is to reduce to realize cost, adopts the word length of less ADC, obtains enough quantified precisions, and has reduced the implementation complexity of follow-up baseband circuit.
In 3GPP (third generation partner program) LTE (Long Term Evolution) system, Cell searching is important physical process, comprising search of initial zone, and neighboring cell search etc.In the neighboring cell search process of homologous ray, comprise again co-frequency cell search and alien-frequency district search process.For alien-frequency district search, 3GPP36.133 standard code, system by dividing a GAP (gap) (length is 6ms) according to certain cycle (every 40ms or 80ms) within a period of time.In GAP, Serving cell can not send data to terminal, but allows this terminal utilize this time to do Cell searching and the cell measurement of alien frequencies, as shown in Figure 1.
In the reciprocal process of wireless communication terminal and Serving cell, although having adjusted to Serving cell, the yield value of wireless communication terminal matches, but the frequency that can be switched to place, non-service cell when carrying out alien frequencies neighboring cell search and measuring, at this moment the needs of wireless communication terminal readjust to adapt to the characteristic of alien-frequency district signal.
In alien-frequency district search, the base station of minizone may be asynchronous.That is to say terminal and do not know the timing information of alien-frequency district, for TD-LTE system, AGC may be by the yield value of deriving from upward signal for downstream signal, also the corresponding yield value of up-downgoing conversion interval may be caused for downstream signal to downstream signal quantization error is excessive or the peak that disappears is too much.Therefore be necessary to design for the AGC algorithm in GAP.
Summary of the invention
Provide hereinafter about brief overview of the present invention, to the basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is determined key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only that the form of simplifying provides some concept, usings this as the preorder in greater detail of discussing after a while.
According to an aspect of the present invention, a kind of wireless communication terminal comprises: automatic gain control unit, is configured to the reception signal of wireless communication terminal to carry out automatic gain control; Gap control unit, is configured to startup and the end of control gap; Gap operating determining unit, is configured to determine the operation that will carry out in next gap; And pattern control unit, be configured to arrange according to definite operation the pattern of automatic gain control unit in next gap.
According to a further aspect in the invention, a kind of auto gain control method for wireless communication terminal, comprising: determine the operation that will carry out in next gap; The pattern of automatic gain control operation in next gap is set according to definite operation; And the pattern of controlling according to the automatic gain arranging is carried out automatic gain control operation to the reception signal of wireless communication terminal.
The present invention is directed to the feature of GAP in wireless communication system and design, guaranteed wireless communication terminal in GAP under each operating state the precision of quantized signal.
Accompanying drawing explanation
Below with reference to the accompanying drawings illustrate embodiments of the invention, can understand more easily above and other objects, features and advantages of the present invention.Parts in accompanying drawing are just in order to illustrate principle of the present invention.In the accompanying drawings, same or similar technical characterictic or parts will adopt same or similar Reference numeral to represent.
Fig. 1 shows the schematic diagram of the GAP of LTE system;
Fig. 2 shows the frame structure of TD-LTE system;
Fig. 3 shows the position of reference signal in the frame structure of TD-LTE system;
Fig. 4 shows according to the wireless communication terminal of an embodiment of the present disclosure;
Fig. 5 shows according to the automatic gain control unit in the wireless communication terminal of an embodiment of the present disclosure;
Fig. 6 shows according to the Gain generating device in the wireless communication terminal of an embodiment of the present disclosure;
Fig. 7 shows a kind of implementation according to the fast mode of embodiment of the present disclosure;
Fig. 8 shows the another kind of implementation according to the fast mode of embodiment of the present disclosure;
Fig. 9 shows the operation of controlling according to automatic gain under the low-speed mode of embodiment of the present disclosure;
Figure 10 shows the auto gain control method for wireless communication terminal according to embodiment of the present disclosure.
Embodiment
Embodiments of the invention are described with reference to the accompanying drawings.The element of describing in an accompanying drawing of the present invention or a kind of execution mode and feature can combine with element and feature shown in one or more other accompanying drawing or execution mode.It should be noted that for purposes of clarity, in accompanying drawing and explanation, omitted expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and processing.
Following partial content is usingd LTE (Long Term Evolution) the TDD system (TD-LTE system) of 3GPP as the example of TDD system, but should be appreciated that, the invention is not restricted to TD-LTE system, also goes for similar system.
Fig. 2 shows the frame structure schematic diagram of TD-LTE system.TD-LTE system comprises three kinds of subframe structures: sub-frame of uplink (subframe), descending sub frame and special subframe.In Fig. 2, subframe #0, #3, #4 are descending sub frame, and subframe #2 is sub-frame of uplink, and subframe #1 is special subframe.In narration, with " D " sign descending sub frame, " U " identifies sub-frame of uplink below, and " S " identifies special subframe, and it is unknown that " X " identifies current subframe type.Each subframe comprises the time slot that two length are 0.5ms (slot).Special subframe is by DwPTS, GP, and UpPTS forms.Main synchronizing symbol (Primary synchronization symbol, PSS) be positioned at the 3rd symbol of DwPTS, and auxiliary synchronizing symbol (Secondary synchronization symbol, SSS) is positioned at last symbol of first subframe (SF#0), as shown in Figure 2.Cell searching utilizes the detection of these two synchronizing symbols is obtained to frame regularly and community ID.
Table 1 shows several frame configurations in TD-LTE system.
Frame configuration in table 1TD-LTE system
Figure GSB0000116503770000031
Figure GSB0000116503770000041
Fig. 3 shows the position of reference signal in the frame structure of TD-LTE system.In Fig. 3, be labeled as R 0position be the reference signal position of port0, the position of shade is the reference signal position of port1.As shown in Figure 2, reference signal is arranged in the #0 of slot, #4 symbol.In downstream signal, no matter have or not transfer of data, reference signal all will send.
Fig. 4 shows the wireless communication terminal 400 according to an embodiment of the present disclosure.
Wireless communication terminal 400 comprises gap control unit 402, gap operating determining unit 404, pattern control unit 406 and automatic gain control unit 408.Automatic gain control unit 408 is configured to the reception signal of wireless communication terminal 400 to carry out automatic gain control.Gap control unit 402 is configured to startup and the end of control gap.For example, gap control unit 402 can be based on receive GAP related signaling from base station, come startup and the end of control gap, and inform that local oscillator control unit (not shown) is adjusted to given alien frequencies frequency after GAP is initial, adjusts back to the frequency of serving BS before GAP process finishes.In addition, after the required adjusting of the VCO time, the unlatchings such as notice neighboring cell search unit (not shown), channel measurement unit (not shown); And at VCO, recall to institute and must before the time, close corresponding units.Gap operating determining unit 404 is configured to determine the operation that will carry out in next gap.Pattern control unit 406 is configured to arrange according to definite operation the pattern of automatic gain control unit 408 in next gap.In one example, the yield value adjustment cycle of automatic gain control unit under fast mode is less than or equal to a subframe lengths, and yield value adjustment cycle under low-speed mode is greater than a subframe lengths.
In one example, the pattern of automatic gain control unit comprises fast mode, low-speed mode and stop mode.The yield value adjustment cycle of automatic gain control unit 408 under fast mode is less than the yield value adjustment cycle under low-speed mode.Automatic gain control unit 408 does not carry out automatic gain control under stop mode.
Wireless communication terminal can carry out alien-frequency district search by following steps: synchronous to the time of alien frequencies adjacent base station and frequency, and detect the ID of alien-frequency district; That based on neighboring cell search, sets up is synchronous, and ground tracking time and Frequency Synchronization further become more meticulous; The signal quality of alien frequencies neighbor cell and signal interference level are measured.Above-mentioned steps and be that those skilled in the art can realize for completing the parts of these steps, is not described in detail here.
In one example, the operational example that will carry out in the determined next gap of gap operating determining unit 404 is as comprised one or more of following operation: the operation of yield value initial convergence; Main synchronizing symbol detects operation; Auxiliary synchronizing symbol detects operation; Yield value is restrained operation again; Channel measurement operation; And sleep operation.The operation of yield value initial convergence can be used for carrying out yield value convergence in the GAP of the GAP starting most or recovery from sleep pattern (now wireless communication system does not obtain frame regularly).Main synchronizing symbol detects operation can be used for carrying out main synchronizing symbol detection.Auxiliary synchronizing symbol detects operation can be used for carrying out auxiliary synchronizing symbol detection.Yield value is restrained operation again can make yield value further restrain and stablize for auxiliary synchronizing symbol detected at wireless communication terminal after.Channel measurement operation can be for measuring the signal quality of alien frequencies neighbor cell and signal interference level.Sleep operation can, for after completing channel measurement or after the temporary transient failure of Cell searching, now not carry out the operation of relevant alien-frequency district search.
Pattern control unit 406 can detect operation or auxiliary synchronizing symbol detection operation in the situation that the operation that will carry out in next gap is the operation of yield value initial convergence, main synchronizing symbol, and in next gap, the pattern of automatic gain control unit 408 is set to fast mode; In the situation that the operation that will carry out in next gap is yield value, restrain operation or channel measurement operation, in next gap, the pattern of automatic gain control unit is set to low-speed mode again; In the situation that the operation that will carry out in next gap is sleep operation, in next gap, the pattern of automatic gain control unit 408 is set to stop mode.
Gap operating determining unit 404 can be determined the operation that will carry out in next gap according to predetermined arranging.For example, can set in advance and in 1st～L1 GAP, carry out the operation of yield value initial convergence, in L2 GAP subsequently, carry out main synchronizing symbol and detect operation, in L3 GAP subsequently, carry out auxiliary synchronizing symbol and detect operation, in L4 GAP subsequently, carry out the operation of yield value initial convergence, in L5 GAP subsequently, carry out channel measurement operation, in L6 GAP subsequently, carry out sleep operation.Gap operating determining unit 404 also can the implementation status based on the step of relevant alien-frequency district search in wireless communication terminal 400 be determined the operation that will carry out in next gap.For example, gap operating determining unit 404 can be communicated by letter with the parts (not shown) that wireless communication terminal detects for auxiliary synchronizing symbol, and at these parts, completing auxiliary synchronizing symbol, to detect the operation that post gap operation determination unit 404 will carry out in can determining next gap be that yield value is restrained operation again.
In the present embodiment, according to the operation that will carry out in the determined next gap of gap operating determining unit 404, mode controller 406 is adjusted to different patterns by automatic gain control unit 408, guaranteed wireless communication terminal 400 in gap under each operating state the precision of necessary quantized signal.
Fig. 5 shows according to the automatic gain control unit 500 in the wireless communication terminal of an embodiment of the present disclosure.
Automatic gain control unit 500 comprises Gain generating device 506, is configured to generate yield value; Variable gain amplifier 502, the yield value that is configured to generate according to Gain generating device 506 is adjusted and is received the amplitude of signal the signal after output adjustment; And A-D converter 504, be configured to be transformed to digital signal from the signal of variable gain amplifier 502 outputs.
Gain generating device 506 can receive by measuring some time periods the power of signal (by the signal after ADC), compare with reference power, according to certain algorithm, generate yield value (gain), then pass to the amplitude that variable gain amplifier 502 is adjusted the analog signal that the next time period receives.
Fig. 6 shows according to the Gain generating device 600 in the wireless communication terminal of an embodiment of the present disclosure.
Gain generating device 600 comprises power measurement module 602, is configured to measure the power that receives signal; Power comparison module 604, is configured to the power of the reception signal of measurement and target power comparison to determine power adjustment; And average module 604, be configured to the current power adjustment of determining and previous power adjustment weighted average.
Below with one more specifically example introduce the operation of the modules of Gain generating device 600.
In one example, power measurement module 602, for receiving signal r (i), is measured N measureaverage power in individual sampling point interval.N measurethe time span T that individual sampling point is corresponding measwith in TDD-LTE system, use the symbol lengths of Norma1CP suitable, 14 T measlength be a subframe lengths 1ms.Required average power is:
P est ( k ) = 1 N measure Σ i = 0 N measure | r ( kN measure + i ) | 2 , k = 0,1,2 , . . . , K set - 1
K setfor being more than or equal to 1 integer.
More than adopt average power as signal strength metric, the invention is not restricted to this, also can adopt average amplitude as signal strength metric.
Then, from K setindividual recording got maximum in power,
P est_max=max(P est(0)，P est(1),...，P est(K set-1))
Alternatively, through logarithmic transformation, can obtain: P dB=10log 10(P est_max) [dB]
More than adopt K setindividually record maximum in power as the power of measuring, the invention is not restricted to this, also can adopt K setthe individual mean value that records power is as the power of measuring.
Power comparison module 604, by the power of the reception signal of measurement and target power comparison to determine power adjustment.Target power can be determined by the maximum quantized power of A-D converter and the difference of margin value (Headroom).The maximum quantized power of A-D converter is determined by the word length of ADC.Suppose the word length N of ADC bit, margin value is P hR[dB]
P tar=10log 10(2×(2 Nbit-1-1) 2)-P HR[dB]
P wherein hRcan arrange according to the different mode of different automatic gain control units, also can by the disappear degree at peak of ADC, be set according to signal.
Then can calculate target power and the poor Δ P that records power
ΔP=P tar-P dB[dB]
The difference power Δ P (namely power adjustment) of j surveying range can be written as:
ΔP(j)=P tar(j)-P dB(j)
Averaging unit 606 can utilize following formula by current power adjustment and the front weighted average of adjustment amount several times:
Δ P ‾ ( j ) = aΔP ( j ) + ( 1 - a ) Δ P ‾ ( j - 1 )
Wherein, suppose
Figure GSB0000116503770000072
α is forgetting factor, for the pattern of different automatic gain control units, and forgetting factor 0 <=α <=1.
Final gain value is updated to
G ( j ) = G ( j - 1 ) + &Delta; P &OverBar; [ dB ] .
Introduce the operation of automatic gain control unit under different mode below.
In one embodiment, wireless communication terminal operates below carrying out successively in continuous GAP: yield value initial convergence operation (this operation is carried out by automatic gain control unit), main synchronizing symbol detect and operate, auxiliary synchronizing symbol detects and operates, yield value is restrained operation, channel measurement operation and sleep operation again.When wireless communication terminal is carried out the operation of yield value initial convergence, main synchronizing symbol detection operation and auxiliary synchronizing symbol detection operation, automatic gain control unit is set to fast mode by pattern control unit.When wireless communication terminal execution yield value is restrained operation (this operation is carried out by automatic gain control unit) or channel measurement operation again, automatic gain control unit is set to low-speed mode by pattern control unit; In the situation that wireless communication terminal is carried out sleep operation, automatic gain control unit is set to stop mode by pattern control unit.
1. fast mode
According to the frame structure shown in table 1, a subframe before special subframe must be descending sub frame.By the adjustment in the DwPTS in this subframe and special subframe, yield value is converged to be suitable for the yield value of synchronizing symbol.
Fig. 7 shows a kind of implementation of fast mode according to an embodiment of the invention.In Fig. 7.T meask setfor measuring (Measure) time, T applybe that yield value calculates, yield value feeds back to VGA, VGA adjusts according to yield value and to stablizing needed processing delay, by device level, is determined.Conventionally, T applythan T meask setmuch smaller, even can ignore.
At initial (the GAP head as shown in FIG.) of fast mode, for example, when starting up of terminal or from sleep state recovers, first by several, measure adjustment (warm up), within the horizontal adjustment that alien-frequency district is received to signal arrives ADC working range.The number of times of adjusting can be set according to the dynamic range of ADC dynamic range and reception signal.For example, for 12bit ADC, the signal of 72dB dynamic range, in order to guarantee to converge to an available yield value from a random yield value of setting, the starting stage is carried out 3-5 yield value adjustment.Afterwards, wireless communication terminal starts to carry out alien frequencies neighboring cell search.For the variation that guarantees that AGC can trace signals power, forgetting factor α can value be 1, that is to say, the weight of the previous power adjustment in average module can be set to zero.In addition, in order to guarantee that signal is not as far as possible by peak clipping, and there are a rational dynamic range, P hRvalue is 9～36dB, more preferably, is chosen as approximately 18～27dB.
For TD-LTE system, alien frequencies neighbor cell may be asynchronous community.When not knowing the synchronizing information of alien frequencies neighbor cell, need to utilize as far as possible the descending sub frame before special subframe to carry out yield value adjustment more frequently.At this moment, K setbe worth the smaller the better, but the setting of considering Kset should not be less than the maximum time domain interval between reference signal in order to avoid the null symbol completely measuring, with reference to Fig. 3, can be by K setvalue is 4-5.That is to say the measuring period of power measurement module as receiving the maximum time domain interval of the reference signal in signal or the large symbol lengths of maximum time domain interval that ratio receives the reference signal in signal.As shown in Figure 8, each measuring period non-overlapping copies, and the yield value adjustment cycle of automatic gain control unit (G0, G1 ...) and equal the measuring period of power measurement module.In one embodiment, the yield value adjustment cycle of automatic gain control unit can be greater than the measuring period of power measurement module.
In addition, in order to prevent the impact of up-downgoing interval GP on AGC, can be at fixing P hRbasis on increase a margin value deviant.Thereby target power can be expressed as:
P tar=10log 10(2×(2 Nbit-1) 2)-P HR-P offset
P wherein offset>=0, by the disappeared ratio-dependent at peak of signal, peak P more at most disappears offsetlarger.For example, can utilize overflow (overflowing) the output mechanism of ADC to obtain margin value deviant.Particularly, can add up corresponding fast mode surveying range T meask setthe sampling point number of interior overflow and the ratio that gross sample is counted out.Can adopt the method for fixed gate limit value, when this ratio surpasses 10%, P offset=3dB; Ratio surpasses 20%, P offset=6dB.If ADC does not have overflow output function, can adopt the number of samples of Full-span output and the ratio of total number of samples to replace.
Fig. 8 shows the another kind of implementation of fast mode according to an embodiment of the invention.With the difference of Fig. 7 be to overlap each other each measuring period (Measure), the yield value adjustment cycle of automatic gain control unit (G0, G1 ...) and be less than the measuring period of power measurement module, adjustment cycle is 1-2 T meas, in this Fig. 7, ignore T in addition apply.In Fig. 8, faster than in Fig. 7 of the convergence rate of yield value.
After auxiliary synchronizing symbol has detected, cell search unit has detected the timing information of alien frequencies base station, carrier frequency position and community ID.Trigger controller thus, and and then notice AGC unit stop fast mode, proceed to low-speed mode.
When fast mode is transformed into low-speed mode, can adopt in two ways:
1. at last GAP of fast mode, AGC yield value when GAP is finished is stored, and terminal adjusts back to the carrier frequency of Serving cell, uses the AGC of corresponding with service base station to receive signal.At next GAP, start, the GAP that low-speed mode starts recovers, and uses the gain of the corresponding alien frequencies base station of storage to carry out the operation of corresponding alien frequencies base station.
2. N renewal value before under the interior fast mode of storage GAP, N is for being more than or equal to 1 integer such as grade, if auxiliary synchronizing symbol detects successfully in this GAP, fast mode terminates in this GAP.At next GAP, proceed to low-speed mode, at this moment use corresponding auxiliary synchronizing symbol to detect AGC gain corresponding between the location of peak value as the gain of this GAP.
2. low-speed mode
Fig. 9 shows the operation of controlling according to automatic gain under the low-speed mode of embodiment of the present disclosure.In low-speed mode, obtained frame regularly (having completed main synchronizing symbol detection and auxiliary synchronizing symbol detects).Now, AGC, according to frame timing information, carries out the measurement of the AGC yield value of low speed in subframe 0 or subframe 5.Each GAP is only used a yield value, and the yield value (gain) that previous GAP generates is used to the automatic gain control unit (for example variable gain amplifier in automatic gain control unit) of next GAP.When channel measurement operation finishes, wireless communication terminal is stored the AGC yield value of corresponding alien frequencies adjacent base station.GAP latter end, VCO adjusts back to the carrier frequency of serving BS, uses the AGC gain of serving BS to receive signal.When next GAP arrives, wireless communication terminal is used the alien frequencies adjacent base station gain of storage.
Under low-speed mode, in order to guarantee the stability of yield value, forgetting factor α value is 0.1～0.5, that is to say, the weight of the previous power adjustment in average module is 1～9 with the ratio of the weight of current power adjustment.K setbe 14, be namely a subframe measuring period of power measurement module, P hRvalue is 9-36dB, is more preferably about 18-27dB.
In one embodiment, the running parameter of automatic gain control unit under each pattern, forgetting factor α for example, K set, P hRdeng being arranged by pattern control unit.In another embodiment, pattern control unit only arranges the pattern of automatic gain control unit and/or the stage in pattern, and the parameter under each mode of operation can set in advance in automatic gain control unit.
Figure 10 shows the auto gain control method for wireless communication terminal according to embodiment of the present disclosure.
In step 1002, determine the operation that will carry out in next gap.In step 1004, the pattern of automatic gain control operation in next gap is set according to definite operation.In step 1006, the pattern of controlling according to the automatic gain arranging is carried out automatic gain control operation to the reception signal of wireless communication terminal.
In one example, the pattern of automatic gain control operation comprises fast mode, low-speed mode and stop mode, the yield value adjustment cycle of described automatic gain control operation under fast mode is less than the yield value adjustment cycle under low-speed mode, do not carry out automatic gain control operation under stop mode.
In one example, the yield value adjustment cycle of automatic gain control operation under fast mode is less than or equal to a subframe lengths, and yield value adjustment cycle under low-speed mode is greater than a subframe lengths.
In one example, the operation that will carry out in next gap comprises one or more of following operation: the operation of yield value initial convergence; Main synchronizing symbol detects operation; Auxiliary synchronizing symbol detects operation; Yield value is restrained operation again; Channel measurement operation; And sleep operation.The pattern that automatic gain control operation in next gap is set is included in the situation that the operation that will carry out in next gap is the operation of yield value initial convergence, main synchronizing symbol detection operation or auxiliary synchronizing symbol detection operation, and in next gap, the pattern of automatic gain control operation is set to fast mode; In the situation that the operation that will carry out in next gap is yield value, restrain operation or channel measurement operation, in next gap, the pattern of automatic gain control operation is set to low-speed mode again; In the situation that the operation that will carry out in next gap is sleep operation, in next gap, the pattern of automatic gain control operation is set to stop mode.
In one example, automatic gain control operation is included under low-speed mode and in each gap, only uses a yield value, and this yield value generates in a upper gap.
In one example, automatic gain control operation comprises: generate yield value; According to yield value, adjust the amplitude that receives signal; And the signal after adjusting is carried out to analog to digital conversion to be transformed to digital signal.In one example, generating yield value comprises: measure the power that receives signal; By the power of the reception signal of measurement and target power comparison to determine power adjustment; And by the current power adjustment of determining and previous power adjustment weighted average.
In one example, when automatic gain control operation is fast mode, the weight of previous power adjustment is set to zero.
In one example, what target power can be for maximum power and margin value is poor, and when automatic gain control operation is fast mode, margin value is set to 9～36dB, more preferably 18～27dB.
In one example, target power is that maximum quantized power deducts margin value and margin value deviant sum, margin value deviant increases along with the increase of the ratio of the signal at the peak that disappeared in analog to digital conversion, when automatic gain control operation is fast mode, margin value is set to 9～36dB, more preferably 18～27dB.
In one example, when automatic gain control operation is fast mode, the large symbol lengths of maximum time domain interval that the maximum time domain interval that is set to receive the reference signal in signal measuring period in the power of measurement reception signal or ratio receive the reference signal in signal, each measuring period non-overlapping copies, the yield value adjustment cycle of automatic gain control operation is more than or equal to measuring period.
In one example, when described automatic gain control operation is fast mode, the large symbol lengths of maximum time domain interval that the maximum time domain interval that is set to receive the reference signal in signal measuring period in the power of described measurement reception signal or ratio receive the reference signal in signal, overlap each other each measuring period, and the yield value adjustment cycle of described automatic gain control operation is less than described measuring period.
In one example, when automatic gain control operation is low-speed mode, the weight of previous power adjustment is 1～9 with the ratio of the weight of current power adjustment.
In one example, target power is the poor of maximum quantized power and margin value, when automatic gain control operation is low-speed mode and, margin value is set to 9～36dB, is more preferably 18～27dB.
In one example, when automatic gain control operation is low-speed mode, be set to a subframe measuring period in the power of measurement reception signal.
Detail about the operation in Figure 10 can, with reference to the description to wireless communication terminal in conjunction with Fig. 4～Fig. 9, repeat no more here.
In an embodiment of the present invention, wireless communication terminal can be mobile phone, pocket computer, PDA, data card, USB rod, receiver on-board, intelligent appliance, the electronic equipment of any every loading LTE chip such as intelligent instrument.
Above some embodiments of the present invention are described in detail.As one of ordinary skill in the art can be understood, whole or any steps or the parts of method and apparatus of the present invention, can be in the network of any computing equipment (comprising processor, storage medium etc.) or computing equipment, with hardware, firmware, software or their combination, realized, this is that those of ordinary skills use their basic programming skill just can realize in the situation that understanding content of the present invention, therefore need not illustrate at this.
In addition, it is evident that, when relating to possible peripheral operation in superincumbent explanation, will use undoubtedly any display device and any input equipment, corresponding interface and the control program that are connected with any computing equipment.Generally speaking, related hardware in computer, computer system or computer network, software and realize hardware, firmware, software or their combination of the various operations in preceding method of the present invention, form equipment of the present invention and each building block thereof.
Therefore,, based on above-mentioned understanding, object of the present invention can also realize by move a program or batch processing on any messaging device.Described messaging device can be known common apparatus.Therefore, object of the present invention also can be only by providing the program product that comprises the program code of realizing described method or equipment to realize.That is to say, such program product also forms the present invention, and storage or the medium that transmits such program product also form the present invention.Obviously, described storage or transmission medium can be well known by persons skilled in the art, or storage or the transmission medium of any type developing in the future, therefore also there is no need at this, various storages or transmission medium to be enumerated.
In equipment of the present invention and method, obviously, each parts or each step reconfigure after can decomposing, combine and/or decomposing.These decomposition and/or reconfigure and should be considered as equivalents of the present invention.The step that also it is pointed out that the above-mentioned series of processes of execution can order naturally following the instructions be carried out in chronological order, but does not need necessarily according to time sequencing, to carry out.Some step can walk abreast or carry out independently of one another.Simultaneously, in the above in the description of the specific embodiment of the invention, the feature of describing and/or illustrating for a kind of execution mode can be used in same or similar mode in one or more other execution mode, combined with the feature in other execution mode, or substitute the feature in other execution mode.
Should emphasize, term " comprises/comprises " existence that refers to feature, key element, step or assembly while using herein, but does not get rid of the existence of one or more further feature, key element, step or assembly or add.
Although described the present invention and advantage thereof in detail, be to be understood that in the situation that do not exceed the spirit and scope of the present invention that limited by appended claim and can carry out various changes, alternative and conversion.And the application's scope is not limited only to the specific embodiment of the described process of specification, equipment, means, method and step.One of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use carry out with the essentially identical function of corresponding embodiment described herein or obtain process, equipment, means, method or step result essentially identical with it, that existing and will be developed future according to the present invention.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.
About comprising the execution mode of above each embodiment, following remarks is also disclosed.
remarks
1. a wireless communication terminal, comprising:
Automatic gain control unit, is configured to the reception signal of described wireless communication terminal to carry out automatic gain control;
Gap control unit, is configured to startup and the end of control gap;
Gap operating determining unit, is configured to determine the operation that will carry out in next gap; And
Pattern control unit, is configured to arrange according to described definite operation the pattern of automatic gain control unit in next gap.
2. the wireless communication terminal as described in remarks 1, wherein, the pattern of described automatic gain control unit comprises fast mode, low-speed mode and stop mode, the yield value adjustment cycle of described automatic gain control unit under fast mode is less than the yield value adjustment cycle under low-speed mode, and described automatic gain control unit does not carry out automatic gain control under stop mode.
3. the wireless communication terminal as described in remarks 2, the yield value adjustment cycle of wherein said automatic gain control unit under fast mode is less than or equal to a subframe lengths, and yield value adjustment cycle under low-speed mode is greater than a subframe lengths.
4. the wireless communication terminal as described in remarks 2, the operation that will carry out in wherein said next gap comprises one or more of following operation: the operation of yield value initial convergence; Main synchronizing symbol detects operation; Auxiliary synchronizing symbol detects operation; Yield value is restrained operation again; Channel measurement operation; And sleep operation, and
Described pattern control unit detects operation or auxiliary synchronizing symbol detection operation in the situation that the operation that will carry out in next gap is the operation of yield value initial convergence, main synchronizing symbol, and in next gap, the pattern of automatic gain control unit is set to fast mode; In the situation that the operation that will carry out in next gap is yield value, restrain operation or channel measurement operation, in next gap, the pattern of automatic gain control unit is set to low-speed mode again; In the situation that the operation that will carry out in next gap is sleep operation, in next gap, the pattern of automatic gain control unit is set to stop mode.
5. the wireless communication terminal as described in remarks 2, wherein said automatic gain control unit is only used a yield value under low-speed mode in each gap, and this yield value generates in a upper gap.
6. the wireless communication terminal as described in remarks 2, wherein said automatic gain control unit comprises:
Gain generating device, is configured to generate yield value;
Variable gain amplifier, the yield value that is configured to generate according to described Gain generating device is adjusted and is received the amplitude of signal the signal after output adjustment; And
A-D converter, is configured to be transformed to digital signal from the signal of described variable gain amplifier output,
Wherein said Gain generating device comprises:
Power measurement module, is configured to measure the power that receives signal;
Power comparison module, is configured to the power of the reception signal of measurement and target power comparison to determine power adjustment; And
Average module, is configured to the current power adjustment of determining and previous power adjustment weighted average.
7. the wireless communication terminal as described in remarks 6, wherein at described automatic gain control unit during in fast mode, the weight of the previous power adjustment in described average module is set to zero.
8. the wireless communication terminal as described in remarks 6, the maximum quantized power that wherein said target power is described A-D converter and margin value poor, at described automatic gain control unit, during in fast mode, described margin value is set to 9～36dB.
9. the wireless communication terminal as described in remarks 6, wherein said target power is that the maximum quantized power of described A-D converter deducts margin value and margin value deviant sum, described margin value deviant increases along with the increase of the ratio of the signal at the peak that disappeared in described A-D converter, at described automatic gain control unit, during in fast mode, described margin value is set to 9～36dB.
10. the wireless communication terminal as described in remarks 8 or 9, wherein at described automatic gain control unit during in fast mode, described margin value is set to 18～27dB.
11. wireless communication terminals as described in remarks 6, wherein at described automatic gain control unit during in fast mode, be set to receive the maximum time domain interval of the reference signal in signal or the large symbol lengths of maximum time domain interval that ratio receives the reference signal in signal the measuring period of described power measurement module, each measuring period non-overlapping copies, the yield value adjustment cycle of described automatic gain control unit is more than or equal to the measuring period of described power measurement module.
12. wireless communication terminals as described in remarks 6, wherein at described automatic gain control unit during in fast mode, be set to receive the maximum time domain interval of the reference signal in signal or the large symbol lengths of maximum time domain interval that ratio receives the reference signal in signal the measuring period of described power measurement module, overlap each other each measuring period, and the yield value adjustment cycle of described automatic gain control unit is less than the measuring period of described power measurement module.
13. wireless communication terminals as described in remarks 6, wherein at described automatic gain control unit during in low-speed mode, the weight of the previous power adjustment in described average module is 1～9 with the ratio of the weight of current power adjustment.
14. wireless communication terminals as described in remarks 6, wherein said target power is the poor of the maximum quantized power of described A-D converter and margin value, at described automatic gain control unit during in low-speed mode and when described wireless communication terminal does not regularly obtain the state of frame configuration in obtaining frame, described margin value is set to 9～36dB.
15. wireless communication terminals as described in remarks 14, at described automatic gain control unit during in low-speed mode and when described wireless communication terminal does not regularly obtain the state of frame configuration in obtaining frame, described margin value is set to 18～27dB.
16. wireless communication terminals as described in remarks 6, wherein during in low-speed mode, are set to a subframe at described automatic gain control unit the measuring period of described power measurement module.
17. 1 kinds of auto gain control methods for wireless communication terminal, comprising:
Determine the operation that will carry out in next gap;
The pattern of automatic gain control operation in next gap is set according to described definite operation; And
The pattern of controlling according to the automatic gain arranging is carried out automatic gain control operation to the reception signal of described wireless communication terminal.
18. methods as described in remarks 17, the pattern of described automatic gain control operation comprises fast mode, low-speed mode and stop mode, the yield value adjustment cycle of described automatic gain control operation under fast mode is less than the yield value adjustment cycle under low-speed mode, do not carry out automatic gain control operation under stop mode.
19. methods as described in remarks 18, the yield value adjustment cycle of wherein said automatic gain control operation under fast mode is less than or equal to a subframe lengths, and yield value adjustment cycle under low-speed mode is greater than a subframe lengths.
20. methods as described in remarks 18, the operation that will carry out in wherein said next gap comprises one or more of following operation: the operation of yield value initial convergence; Main synchronizing symbol detects operation; Auxiliary synchronizing symbol detects operation; Yield value is restrained operation again; Channel measurement operation; And sleep operation, and
It is that the operation of yield value initial convergence, main synchronizing symbol detect in the situation of operation or auxiliary synchronizing symbol detection operation that the described pattern that automatic gain control operation in next gap is set is included in the operation that will carry out in next gap, and in next gap, the pattern of automatic gain control operation is set to fast mode; In the situation that the operation that will carry out in next gap is yield value, restrain operation or channel measurement operation, in next gap, the pattern of automatic gain control operation is set to low-speed mode again; In the situation that the operation that will carry out in next gap is sleep operation, in next gap, the pattern of automatic gain control operation is set to stop mode.

Claims (8)

1. a wireless communication terminal, comprising:
Automatic gain control unit, is configured to the reception signal of described wireless communication terminal to carry out automatic gain control;
Gap control unit, is configured to startup and the end of control gap;
Gap operating determining unit, is configured to determine the operation that will carry out in next gap; And
Pattern control unit, is configured to arrange according to described definite operation the pattern of automatic gain control unit in next gap;
Wherein, the pattern of described automatic gain control unit comprises fast mode, low-speed mode and stop mode, the yield value adjustment cycle of described automatic gain control unit under fast mode is less than the yield value adjustment cycle under low-speed mode, and described automatic gain control unit does not carry out automatic gain control under stop mode;
The operation that will carry out in wherein said next gap comprises one or more of following operation: the operation of yield value initial convergence; Main synchronizing symbol detects operation; Auxiliary synchronizing symbol detects operation; Yield value is restrained operation again; Channel measurement operation; And sleep operation, and
Described pattern control unit detects operation or auxiliary synchronizing symbol detection operation in the situation that the operation that will carry out in next gap is the operation of yield value initial convergence, main synchronizing symbol, and in next gap, the pattern of automatic gain control unit is set to fast mode; In the situation that the operation that will carry out in next gap is yield value, restrain operation or channel measurement operation, in next gap, the pattern of automatic gain control unit is set to low-speed mode again; In the situation that the operation that will carry out in next gap is sleep operation, in next gap, the pattern of automatic gain control unit is set to stop mode.
2. wireless communication terminal as claimed in claim 1, the yield value adjustment cycle of wherein said automatic gain control unit under fast mode is less than or equal to a subframe lengths, and yield value adjustment cycle under low-speed mode is greater than a subframe lengths.
3. wireless communication terminal as claimed in claim 1, wherein said automatic gain control unit is only used a yield value under low-speed mode in each gap, and this yield value generates in a upper gap.
4. wireless communication terminal as claimed in claim 1, wherein said automatic gain control unit comprises:
Gain generating device, is configured to generate yield value;
Variable gain amplifier, the yield value that is configured to generate according to described Gain generating device is adjusted and is received the amplitude of signal the signal after output adjustment; And
A-D converter, is configured to be transformed to digital signal from the signal of described variable gain amplifier output,
Wherein said Gain generating device comprises:
Power measurement module, is configured to measure the power that receives signal;
Power comparison module, is configured to the power of the reception signal of measurement and target power comparison to determine power adjustment; And
Average module, is configured to the current power adjustment of determining and previous power adjustment weighted average.
5. wireless communication terminal as claimed in claim 4, wherein at described automatic gain control unit during in fast mode, the weight of the previous power adjustment in described average module is set to zero.
6. wireless communication terminal as claimed in claim 4, wherein at described automatic gain control unit during in fast mode, be set to receive the maximum time domain interval of the reference signal in signal or the large symbol lengths of maximum time domain interval that ratio receives the reference signal in signal the measuring period of described power measurement module, each measuring period non-overlapping copies, the yield value adjustment cycle of described automatic gain control unit is more than or equal to the measuring period of described power measurement module.
7. wireless communication terminal as claimed in claim 4, wherein at described automatic gain control unit during in fast mode, be set to receive the maximum time domain interval of the reference signal in signal or the large symbol lengths of maximum time domain interval that ratio receives the reference signal in signal the measuring period of described power measurement module, overlap each other each measuring period, and the yield value adjustment cycle of described automatic gain control unit is less than the measuring period of described power measurement module.
8. wireless communication terminal as claimed in claim 4, wherein at described automatic gain control unit during in low-speed mode, the weight of the previous power adjustment in described average module is 1～9 with the ratio of the weight of current power adjustment.
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