CN102348274B - Wireless communication terminal - Google Patents
Wireless communication terminal Download PDFInfo
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- CN102348274B CN102348274B CN201010244333.0A CN201010244333A CN102348274B CN 102348274 B CN102348274 B CN 102348274B CN 201010244333 A CN201010244333 A CN 201010244333A CN 102348274 B CN102348274 B CN 102348274B
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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 and a mode control unit, wherein the automatic gain control unit is configured for conducting automatic gain control on receiving signals of the wireless communication terminal; and the mode control unit is configured for setting the mode of the automatic gain control unit according to the states of the wireless communication terminal, wherein the states of the wireless communication terminal include a state of failing to acquire the timing of frames and a state of successfully acquiring the timing of frames, the modes of the automatic gain control unit include a high-speed mode and a low-speed mode, the gain value regulation period of the automatic gain control unit in the high-speed mode is shorter than that in the low-speed mode, the mode control unit sets the mode of the automatic gain control unit to be the high-speed mode when the wireless communication terminal enters in the state of failing to acquire the timing of frames, and the mode control unit sets the mode of the automatic gain control unit set to be the low-speed mode when the wireless communication terminal enters in the state of successfully acquiring the timing of frames.
Description
Technical field
The application relates to radio communication, relates in particular to the automatic gain control (AGC) in time division duplex (TDD) wireless communication system.
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 control (Automatic gain control, AGC) technology to solve.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 time division duplex (Time Division Duplex, TDD) system, user terminal (User Equipment, UE) can be received the downstream signal that comes from base station and the upward signal that comes from neighboring user at carrier frequency point simultaneously.Because upward signal and downstream signal come from respectively separate signal source, for terminal receiver, reception signal statistics and the performance number in up operation interval and downlink working interval can differ greatly conventionally.Set up synchronous in the situation that with base station at UE, UE can carry out by only measuring downstream signal the renewal of AGC gain.But not yet set up the situation of synchronizeing with base station for UE, UE cannot distinguish the upward signal of downstream signal and contiguous UE transmission, and the yield value that AGC may generate according to upward signal power be applied to downstream signal.In the time that the power difference of upward signal and downstream signal is very large, can cause downstream signal by ADC peak clipping (Clipping) or the effectively minimizing of quantization bit.This will cause the damage that quantizes rear synchronizing symbol, and causes the increase of synchronization acquistion time and even cannot obtain synchronous.
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, using 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; and pattern control unit, be configured to arrange according to the state of wireless communication terminal the pattern of automatic gain control unit, wherein, the state of wireless communication terminal comprises and does not obtain the state of frame timing and obtained frame state regularly, the pattern of automatic gain control unit comprises fast mode and low-speed mode, the yield value adjustment cycle of automatic gain control unit under fast mode is less than the yield value adjustment cycle under low-speed mode, the pattern of pattern control unit automatic gain control unit in the time that wireless communication terminal enters the state that does not obtain frame timing is set to fast mode, in the time that wireless communication terminal enters the state that obtains frame timing, the pattern of automatic gain control unit is set to low-speed mode, the state that has wherein obtained frame timing comprises that obtaining frame timing does not obtain the state of frame configuration and obtained frame timing and the state of frame configuration, and wherein at automatic gain control unit during in low-speed mode and when the state of wireless communication terminal in obtaining frame timing and not obtaining frame configuration, automatic gain control unit only regenerates yield value in the first subframe of each field.
According to a further aspect in the 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; and pattern control unit, be configured to arrange according to the state of wireless communication terminal the pattern of automatic gain control unit, wherein, the state of wireless communication terminal comprises and does not obtain the state of frame timing and obtained frame state regularly, the pattern of automatic gain control unit comprises fast mode and low-speed mode, the yield value adjustment cycle of automatic gain control unit under fast mode is less than the yield value adjustment cycle under low-speed mode, the pattern of pattern control unit automatic gain control unit in the time that wireless communication terminal enters the state that does not obtain frame timing is set to fast mode, in the time that wireless communication terminal enters the state that obtains frame timing, the pattern of automatic gain control unit is set to low-speed mode, the state that has wherein obtained frame timing comprises that obtaining frame timing does not obtain the state of frame configuration and obtained frame timing and the state of frame configuration, and wherein at automatic gain control unit during in low-speed mode and when the state of wireless communication terminal in obtaining frame timing and frame and configuring, automatic gain control unit only regenerates yield value at descending sub frame.
The present invention can realize the automatic gain control in TDD radio communication system effectively.
Brief description of the drawings
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 frame structure of TD-LTE system;
Fig. 2 shows the position of reference signal in the frame structure of TD-LTE system;
Fig. 3 shows according to the wireless communication terminal of an embodiment of the present disclosure;
Fig. 4 shows according to the automatic gain control unit in the wireless communication terminal of an embodiment of the present disclosure;
Fig. 5 shows according to the Gain generating device in the wireless communication terminal of an embodiment of the present disclosure;
Fig. 6 shows a kind of implementation according to the fast mode of embodiment of the present disclosure;
Fig. 7 shows the another kind of implementation according to the fast mode of embodiment of the present disclosure;
Fig. 8 shows according to the operation of automatic gain control under the previous stage of the low-speed mode of embodiment of the present disclosure;
Fig. 9 shows according to the operation of automatic gain control under the latter half of the low-speed mode of embodiment of the present disclosure; And
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.
The example of following partial content using LTE (Long Term Evolution) the TDD system (TD-LTE system) of 3GPP as TDD system, but should be appreciated that, the invention is not restricted to TD-LTE system.
Fig. 1 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. 1, 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 " mark descending sub frame, " U " identifies sub-frame of uplink below, and " S " identifies special subframe, and " X " identifies current subframe type the unknown.Each subframe comprises the time slot that two length are 0.5ms (slot).Special subframe is by DwPTS, GP, and UpPTS composition.Main synchronizing symbol (Primary synchronization symbol, PSS) be positioned at the 3rd symbol of DwPTS, and auxiliary synchronizing symbol (Secondary synchronization symbol, SSS) be positioned at last symbol of first subframe (SF#0), as shown in Figure 1.Cell searching utilizes the detection of these two synchronizing symbols is obtained to frame timing and community ID.
Table 1 shows several frame configurations in TD-LTE system.
Frame configuration in table 1TD-LTE system
Fig. 2 shows the position of reference signal in the frame structure of TD-LTE system.In Fig. 2, 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. 3 shows the wireless communication terminal 300 according to an embodiment of the present disclosure.
Wireless communication terminal 300 comprises pattern control unit 302 and automatic gain control unit 304.Automatic gain control unit 304 is configured to the reception signal of wireless communication terminal 300 to carry out automatic gain control.Pattern control unit 302 is configured to arrange according to the state of wireless communication terminal 300 pattern of automatic gain control unit 304.The state of wireless communication terminal 300 comprises and does not obtain the state of frame timing and obtained frame state regularly.The pattern of automatic gain control unit 304 comprises fast mode and low-speed mode.The yield value adjustment cycle of automatic gain control unit 304 under fast mode is less than the yield value adjustment cycle under low-speed mode.The pattern of pattern control unit 302 automatic gain control unit 304 in the time that wireless communication terminal 300 enters the state that does not obtain frame timing is set to fast mode, and in the time that wireless communication terminal 300 enters the state that obtains frame timing, the pattern of automatic gain control unit 304 is set to low-speed mode.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.
For example, the wireless communication terminal in the LTE TDD system of 3GPP has and does not obtain the state of frame timing and obtained frame state regularly.The state that has obtained frame timing can be divided into again and obtained frame timing and do not obtain the state of frame configuration and obtained frame timing and state that frame configures.For the wireless communication terminal in different accepting states, the object that its signal receives is different.At the state that does not obtain frame timing, the object that receives signal is the rectification of carrier wave frequency deviation between catching of frame timing and terminal and base station; Do not obtain the state of frame configuration obtaining frame timing, the object that receives signal is to obtain system control information; At the state that obtains frame timing and frame configuration, the object that receives signal is that data are recovered.
In the present embodiment, according to the difference of accepting state, signal receives the difference of index, and automatic gain control unit 304 is adjusted to different patterns by pattern control unit 302, has ensured the precision of wireless communication terminal 300 necessary quantized signal under each operating state.
Fig. 4 shows according to the automatic gain control unit 400 in the wireless communication terminal of an embodiment of the present disclosure.
Automatic gain control unit 400 comprises Gain generating device 406, is configured to generate yield value; Variable gain amplifier 402, the yield value that is configured to generate according to Gain generating device 406 is adjusted the signal after amplitude the output adjustment that receives signal; And A-D converter 404, be configured to the signal of exporting from variable gain amplifier 402 to be transformed to digital signal.
Gain generating device 406 can receive by measuring some time periods the power of signal (by the signal after ADC), compare with reference power, generate yield value (gain) according to certain algorithm, then pass to variable gain amplifier 402 and adjust the amplitude of the analog signal that the next time period receives.
Fig. 5 shows according to the Gain generating device 500 in the wireless communication terminal of an embodiment of the present disclosure.
Gain generating device 500 comprises power measurement module 502, is configured to measure the power that receives signal; Power comparison module 504, is configured to the power of the reception signal of measurement and target power comparison to determine power adjustment; And average module 504, 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 500.
In one example, power measurement module 502, 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 Norma1 CP suitable, 14 T
measlength be a subframe lengths 1ms.Required average power is:
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 504, by the power of the reception signal of measurement and target power comparison to determine power adjustment.Target power can be determined by the difference of the maximum quantized power of A-D converter and 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 be set by the disappear degree at peak of ADC 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 506 can utilize following formula by current power adjustment and the front weighted average of adjustment amount several times:
Wherein, suppose
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
Introduce the operation of automatic gain control unit under different mode below.
In one embodiment, in the time that wireless communication terminal does not capture timing information (for example, wireless communication terminal is carrying out searching carrier, search of initial zone or is returning to Active pattern (activity pattern) from sleep pattern), pattern control unit automatic gain control unit is set to fast mode, in fast mode, the measurement of yield value and adjustment cycle are very short, for example, can be less than a subframe lengths.After Cell searching completes, enter the previous stage of low-speed mode, at this moment terminal is only known frame timing information but is not known the uplink-downlink configuration information of frame, can only utilize fixing descending sub frame to carry out AGC measurement.After uplink-downlink configuration information is detected, enter the latter half of low-speed mode, can utilize all descending sub frames to carry out AGC measurement.
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. 6 shows a kind of implementation of fast mode according to an embodiment of the invention.In Fig. 6.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, is determined by device level.Conventionally T,
applythan T
meask
setmuch smaller, even can ignore.
Initial at fast mode, for example, when after starting up of terminal, first measure adjustment (warm up) by several, by the horizontal adjusting that receives signal within 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 ensure 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 Cell searching.For the variation that ensures 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 ensure 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.In order to ensure to have the yield value adjustment of four left and right, K before PSS/SSS symbol
setbe worth the smaller the better, but should not to be less than be the maximum time interval between reference signal in order to avoid the null symbol completely measuring in the setting of considering Kset, with reference to Fig. 2, can be by K
setvalue is 4-5.That is to say and receive the maximum time domain interval of the reference signal in signal or compare the large symbol lengths of maximum time domain interval that receives the reference signal in signal being the measuring period of power measurement module.As shown in Figure 6, 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 exceedes 10%, P
offset=3dB; Ratio exceedes 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. 7 shows the another kind of implementation of fast mode according to an embodiment of the invention.To overlap each other each measuring period (Measure) with the difference of Fig. 6, the yield value adjustment cycle of automatic gain control unit (G0, G1 ...) and little, 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. 7, faster than in Fig. 6 of the convergence rate of yield value.
2. low-speed mode
Fig. 8 shows according to the operation of automatic gain control under the previous stage of the low-speed mode of embodiment of the present disclosure.In the previous stage of low-speed mode, when namely terminal is not regularly obtained the state of frame configuration in obtaining frame, AGC can carry out in first subframe of every field measurement and the renewal of the yield value of low speed, till this stage can last till that terminal obtains uplink-downlink configuration information.In this stage, continue synchronous tracking and system configuration detecting unit, carry out PBCH, PCFICH, PDCCH detects, and in the SIB of PDSCH (system information block), obtains the uplink-downlink configuration information of TD-LTE frame structure.
In the previous stage of low-speed mode, it is to enter next stage that the uplink-downlink configuration that whether obtains frame according to terminal decides.In the previous stage of low-speed mode, only measure downstream signal, the variation of signal power is mainly subject to decline and affect soon, can not change too violent.Owing to likely doing some the previous stage at low-speed mode and detecting the relevant work of measuring, in order to ensure 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.
Fig. 9 has provided the operation of automatically controlling according under the latter half of the low-speed mode of embodiment of the present disclosure.Obtaining after the uplink-downlink configuration of frame, entering the latter half of low-speed mode.In the latter half of low-speed mode, AGC unit only utilizes descending sub frame to carry out AGC renewal.For special subframe, adopt and keep (hold) operation, now do not carry out yield value measurement and renewal.Run into sub-frame of uplink, store current AGC yield value, during sub-frame of uplink, do not carry out any operation (stop), when again running into descending sub frame, recover (restore) AGC storing value before and receive for signal.For different uplink-downlink configuration, the renewal of yield value and measurement procedure be corresponding adjustment also.In the latter half of low-speed mode, in order to ensure 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, before the previous stage of low-speed mode, can also there is a transition stage.Exist the object of transition stage to be, because the gain of the desirable corresponding downstream signal of the yield value distance obtaining under fast mode may also have distance, thereby increase this one-phase and make yield value further convergence is stable.
In one example, corresponding to the region of search of successful Cell searching, all yield values that carry out AGC renewal in this interval are stored to (detecting successfully interval AGC yield value comprising corresponding SSS), in the previous stage of follow-up low-speed mode, use the AGC that corresponding SSS successfully detects to gain as the initial value of AGC under this pattern.
In another example, corresponding to the region of search of successful Cell searching, the yield value that in this interval, last AGC upgrades is stored.In in the previous stage of follow-up low-speed mode as the initial value of AGC.Obtaining after synchronization timing, utilize known fixing descending sub frame 0 and 5, carry out measurement and the renewal of yield value at a high speed, this stage can continue 1-2 field.Meanwhile, enter link synchronization tracing, improve synchronization accuracy by timing and frequency-tracking.Wherein, the lasting time of transition state is 5～10ms (making yield value converge to the yield value that downstream signal is corresponding by the adjusting of 1-2 field).For transition state, forgetting factor α value is 1, K
setfor 4-5, P
hRvalue is 9-36dB, is preferably about 18～27dB.After fixing descending sub frame, keep (hold) last AGC yield value.Can find out, in this transition stage, at fixing descending sub frame, adopt and carry out automatic gain control with running parameter identical under fast mode.
In one embodiment, the running parameter of automatic gain control unit under each pattern, for example forgetting factor α, K
set, P
hRdeng being arranged by pattern control unit.In another embodiment, pattern control unit only arranges the stage in pattern and/or the pattern of automatic gain control unit, 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, the pattern of automatic gain control operation is set according to the state of wireless communication terminal.In step 1004, according to the pattern of the automatic gain control arranging, the reception signal of wireless communication terminal is carried out to automatic gain control operation.The state of wireless communication terminal comprises and does not obtain the state of frame timing and obtained frame state regularly, the pattern of automatic gain control operation comprises fast mode and low-speed mode, under fast mode, yield value adjustment cycle is less than the yield value adjustment cycle under low-speed mode, in the time that wireless communication terminal enters the state that does not obtain frame timing, the pattern of automatic gain control operation is set to fast mode, and in the time that wireless communication terminal enters the state that obtains frame timing, the pattern of automatic gain control operation is set to low-speed 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, obtained frame state regularly and comprised that obtaining frame timing does not obtain the state of frame configuration and obtained frame timing and the state of frame configuration.
In one example, automatic gain control operation comprises: generate yield value; Adjust the amplitude that receives signal according to yield value; 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, target power can be the poor of maximum power and margin value, and in the time that 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, in the time that automatic gain control operation is fast mode, margin value is set to 9～36dB, more preferably 18～27dB.
In one example, in the time that automatic gain control operation is fast mode, measure the large symbol lengths of maximum time domain interval of the reference signal in the maximum time domain interval that is set to receive the reference signal in signal measuring period or the ratio reception signal in the power that receives signal, each measuring period non-overlapping copies, the yield value adjustment cycle of automatic gain control operation is more than or equal to states measuring period.
In one example, in the time that automatic gain control operation is fast mode, measure the large symbol lengths of maximum time domain interval of the reference in the maximum time domain interval that is set to receive the reference signal in signal measuring period or the ratio reception signal in the power that receives signal, overlap each other each measuring period, and the yield value adjustment cycle of automatic gain control operation is less than measuring period.
In one example, in the time that automatic gain control operation is low-speed mode and when the state of wireless communication terminal in obtaining frame timing and not obtaining frame configuration, automatic gain control operation only regenerates yield value in the first subframe of each field.
In one example, in the time that automatic gain control operation is low-speed mode and wireless communication terminal in the time obtaining the state of frame timing and frame configuration, automatic gain control operation regenerates yield value at descending sub frame.
In one example, in the time that 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, and in the time that automatic gain control operation is low-speed mode, margin value is set to 9～36dB, is more preferably 18～27dB.
In one example, in the time that automatic gain control operation is low-speed mode, be set to a subframe measuring period in the power of measurement reception signal.
In one example, in the time that automatic gain control operation is low-speed mode and when wireless communication terminal does not regularly obtain the state of frame configuration in obtaining frame, automatic gain control operation is the transition stage in low-speed mode first, in this transition stage, at fixing descending sub frame, adopt and carry out automatic gain control with running parameter identical under fast mode.
Detail about the operation in Figure 10 can, with reference to the description to wireless communication terminal in conjunction with Fig. 3-Fig. 9, repeat no more here.
Above for according in the description of the wireless communication terminal of embodiment of the present disclosure, searching carrier, Cell searching, synchronously follow the tracks of and the operation such as system configuration detection and the corresponding parts that complete these operations are that those skilled in the art can realize, be not described in detail 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, realized with hardware, firmware, software or their combination, this is that those of ordinary skill in the art 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, software in computer, computer system or computer network and realize hardware, firmware, software or their combination of the various operations in preceding method of the present invention, forms 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 to carry out according to time sequencing.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, describe and/or the feature that illustrates can be used in same or similar mode in one or more other execution mode for a kind of 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 use 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 case of not exceeding 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 the execution mode that comprises 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; And
Pattern control unit, is configured to arrange according to the state of described wireless communication terminal the pattern of automatic gain control unit,
Wherein, the state of described wireless communication terminal comprises and does not obtain the state of frame timing and obtained frame state regularly, the pattern of described automatic gain control unit comprises fast mode and low-speed 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, the pattern of described pattern control unit described automatic gain control unit in the time that described wireless communication terminal enters the state that does not obtain frame timing is set to fast mode, in the time that described wireless communication terminal enters the state that obtains frame timing, the pattern of described automatic gain control unit is set to low-speed mode.
2. the wireless communication terminal as described in remarks 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. the wireless communication terminal as described in remarks 1, the wherein said state that has obtained frame timing comprises that obtaining frame timing does not obtain the state of frame configuration and obtained frame timing and the state of frame configuration.
4. the wireless communication terminal as described in remarks 3, 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 the signal after amplitude the output adjustment that receives signal; 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. the wireless communication terminal as described in remarks 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. the wireless communication terminal as described in remarks 4, 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.
7. the wireless communication terminal as described in remarks 4, 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.
8. the wireless communication terminal as described in remarks 6 or 7, wherein at described automatic gain control unit during in fast mode, described margin value is set to 18～27dB.
9. the wireless communication terminal as described in remarks 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 the measuring period of described power measurement module or compare the large symbol lengths of maximum time domain interval that receives the reference signal in signal, 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.
10. the wireless communication terminal as described in remarks 4, wherein at described automatic gain control unit during in fast mode, be set to receive the largest interval of the reference signal in signal the measuring period of described power measurement module or compare the large symbol lengths of largest interval that receives the reference signal in signal, 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.
11. wireless communication terminals as described in remarks 4, wherein at described automatic gain control unit during in low-speed mode and when the state of described wireless communication terminal in obtaining frame timing and not obtaining frame configuration, described automatic gain control unit only regenerates yield value in the first subframe of each field.
12. wireless communication terminals as described in remarks 4, wherein at described automatic gain control unit during in low-speed mode and described wireless communication terminal in the time obtaining the state of frame timing and frame configuration, described automatic gain control unit regenerates yield value at descending sub frame.
13. wireless communication terminals as described in remarks 11 or 12, 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 11 or 12, 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 low-speed mode, 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, described margin value is set to 18～27dB.
16. wireless communication terminals as described in remarks 11 or 12, 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. wireless communication terminals as described in remarks 11, wherein at described automatic gain control unit during in low-speed mode and when the state of described wireless communication terminal in obtaining frame timing and not obtaining frame configuration, described automatic gain control unit is the transition stage in low-speed mode first, in this transition stage, at fixing descending sub frame, adopt and carry out automatic gain control with running parameter identical under fast mode.
18. 1 kinds of auto gain control methods for wireless communication terminal, comprising:
The pattern of automatic gain control operation is set according to the state of described wireless communication terminal; And
Pattern according to the automatic gain control arranging is carried out automatic gain control operation to the reception signal of described wireless communication terminal;
Wherein, the state of described wireless communication terminal comprises and does not obtain the state of frame timing and obtained frame state regularly, the pattern of described automatic gain control operation comprises fast mode and low-speed mode, under fast mode, yield value adjustment cycle is less than the yield value adjustment cycle under low-speed mode, in the time that described wireless communication terminal enters the state that does not obtain frame timing, the pattern of described automatic gain control operation is set to fast mode, in the time that described wireless communication terminal enters the state that obtains frame timing, the pattern of described automatic gain control operation is set to low-speed 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 wherein said state that has obtained frame timing comprises that obtaining frame timing does not obtain the state of frame configuration and obtained frame timing and state that frame configures.
Claims (13)
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; And
Pattern control unit, is configured to arrange according to the state of described wireless communication terminal the pattern of automatic gain control unit,
Wherein, the state of described wireless communication terminal comprises and does not obtain the state of frame timing and obtained frame state regularly, the pattern of described automatic gain control unit comprises fast mode and low-speed 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, the pattern of described pattern control unit described automatic gain control unit in the time that described wireless communication terminal enters the state that does not obtain frame timing is set to fast mode, in the time that described wireless communication terminal enters the state that obtains frame timing, the pattern of described automatic gain control unit is set to low-speed mode,
The wherein said state that has obtained frame timing comprises that obtaining frame timing does not obtain the state of frame configuration and obtained frame timing and the state of frame configuration, and wherein at described automatic gain control unit during in low-speed mode and when the state of described wireless communication terminal in obtaining frame timing and not obtaining frame configuration, described automatic gain control unit only regenerates yield value in the first subframe of each field.
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 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 the signal after amplitude the output adjustment that receives signal; 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.
4. wireless communication terminal as claimed in claim 3, 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.
5. wireless communication terminal as claimed in claim 3, 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.
6. wireless communication terminal as claimed in claim 3, wherein during in low-speed mode, is set to a subframe at described automatic gain control unit the measuring period of described power measurement module.
7. wireless communication terminal as claimed in claim 1, wherein at described automatic gain control unit during in low-speed mode and when the state of described wireless communication terminal in obtaining frame timing and not obtaining frame configuration, described automatic gain control unit is the transition stage in low-speed mode first, in this transition stage, at fixing descending sub frame, adopt and carry out automatic gain control with running parameter identical under fast mode.
8. 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; And
Pattern control unit, is configured to arrange according to the state of described wireless communication terminal the pattern of automatic gain control unit,
Wherein, the state of described wireless communication terminal comprises and does not obtain the state of frame timing and obtained frame state regularly, the pattern of described automatic gain control unit comprises fast mode and low-speed 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, the pattern of described pattern control unit described automatic gain control unit in the time that described wireless communication terminal enters the state that does not obtain frame timing is set to fast mode, in the time that described wireless communication terminal enters the state that obtains frame timing, the pattern of described automatic gain control unit is set to low-speed mode,
The wherein said state that has obtained frame timing comprises that obtaining frame timing does not obtain the state of frame configuration and obtained frame timing and the state of frame configuration, and wherein at described automatic gain control unit during in low-speed mode and described wireless communication terminal in the time obtaining the state of frame timing and frame configuration, described automatic gain control unit regenerates yield value at descending sub frame.
9. wireless communication terminal as claimed in claim 8, 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.
10. wireless communication terminal as claimed in claim 8, 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 the signal after amplitude the output adjustment that receives signal; 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.
11. wireless communication terminals as claimed in claim 10, 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.
12. wireless communication terminals as claimed in claim 10, 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.
13. wireless communication terminals as claimed in claim 10, 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.
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| CN201010244333.0A CN102348274B (en) | 2010-07-30 | 2010-07-30 | Wireless communication terminal |
| JP2011167115A JP5765120B2 (en) | 2010-07-30 | 2011-07-29 | Wireless communication terminal and automatic gain control method |
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| CN201010244333.0A CN102348274B (en) | 2010-07-30 | 2010-07-30 | Wireless communication terminal |
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| CN102347925B (en) * | 2010-07-30 | 2015-03-11 | 富士通株式会社 | Synchronization symbol detection method and apparatus thereof |
| CN103379607B (en) * | 2012-04-17 | 2018-01-30 | 中兴通讯股份有限公司 | The gain control method and device of TD HSPA+ terminal devices |
| CN103841597B (en) * | 2012-11-27 | 2017-05-17 | 联芯科技有限公司 | Frequency point scanning method and device for TD-SCDMA system |
| CN105657786B (en) * | 2016-01-20 | 2019-05-28 | 华为技术有限公司 | The method of the adjust gain of user equipment and low-noise amplifier |
| CN108462977B (en) * | 2017-02-21 | 2020-07-31 | 深圳市中兴微电子技术有限公司 | Automatic gain control method and device |
| CN111884665B (en) * | 2020-09-28 | 2021-01-01 | 中国人民解放军国防科技大学 | Digital receiver automatic gain control method based on maximum entropy |
| CN114501601A (en) * | 2020-11-11 | 2022-05-13 | 中国移动通信有限公司研究院 | Wireless signal control method, device, equipment and storage medium |
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| CN102348274A (en) | 2012-02-08 |
| JP2012034369A (en) | 2012-02-16 |
| JP5765120B2 (en) | 2015-08-19 |
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