CN102348271A - Wireless communication terminal and automatic gain control method - Google Patents

Abstract

A wireless communication terminal and an automatic gain control method are provided. The wireless communication terminal includes: an automatic gain control unit configured to perform automatic gain control on a reception signal of the wireless communication terminal; a gap control unit configured to control start and end of a gap; a gap operation determination unit configured to determine an operation to be performed in a next gap; a mode control unit configured to set a mode of the automatic gain control unit in a next gap according to the determined operation.

Description

Wireless communication terminal and auto gain control method

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 the wireless communication terminal, because the fading effect (path loss, shadow fading, multipath fading etc.) of wireless channel, and the variation of business load, the amplitude of reception signal and changing significantly dynamically of power can be caused.To the signal quantization distortion that the bigger signal of this dynamic range can cause, (Automatic gain control, AGC) technology solves generally to use automatic gain control.(Analog to Digital Converter under the prerequisite of word length ADC), is adjusted into the dynamic range that is suitable for the ADC word length with the signal of great dynamic range automatically, reduces quantizing distortion not increasing analog to digital converter.Another benefit that adopts the 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 co-frequency cell search and alien-frequency district search process again.For alien-frequency district search, 3GPP 36.133 standard codes, system is through dividing a GAP (gap) (length is 6ms) according to certain cycle (every 40ms or 80ms) in a period of time.In GAP, Serving cell can not send data to the terminal, but allows this terminal utilize this time to do the 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 is complementary; But when carrying out the alien frequencies neighboring cell search and measuring, can switch to the frequency at non-service cell place, at this moment the needs of wireless communication terminal are readjusted to adapt to the characteristic of alien-frequency district signal.

In alien-frequency district search, the base station of minizone possibly be asynchronous.That is to say the terminal and do not know the timing information of alien-frequency district; For the TD-LTE system; AGC possibly be used for downstream signal from the yield value that upward signal is derived, and also the pairing yield value of up-downgoing conversion interval possibly is used for downstream signal and cause the downstream signal quantization error excessive or the peak that disappears is too much.Therefore be necessary to design to the AGC algorithm in the GAP.

Summary of the invention

Provide hereinafter about brief overview of the present invention, so that 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 confirmed key of the present invention or pith, neither be intended to limit scope of the present invention.Its purpose only is to provide some notion with the form of simplifying, with this as the preorder in greater detail of argumentation 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 is carried out automatic gain control; Gap control unit is configured to the startup and the end of control gap; Gap operating is confirmed the unit, is configured to the operation that will carry out in definite next gap; And the pattern control unit, be configured to the pattern that the definite operation of basis is provided with automatic gain control unit in the next gap.

According to a further aspect in the invention, a kind of auto gain control method that is used for wireless communication terminal comprises: confirm the operation that will carry out in the next gap; The pattern of automatic gain control operation in the next gap is set according to the operation of confirming; And the reception signal of wireless communication terminal is carried out the automatic gain control operation according to the pattern of the automatic gain control that is provided with.

The present invention is directed to the characteristics of GAP in the wireless communication system and design, guaranteed wireless communication terminal in GAP under each operating state the precision of quantized signal.

Description of drawings

With reference to below in conjunction with the explanation of accompanying drawing, can understand above and other purpose, characteristics and advantage of the present invention to the embodiment of the invention with being more prone to.Parts in the accompanying drawing are just in order to illustrate principle of the present invention.In the accompanying drawings, identical or similar techniques characteristic or parts will adopt identical or similar Reference numeral to represent.

Fig. 1 shows the sketch map 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 the wireless communication terminal according to 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 maker 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 according to automatic gain control under the low-speed mode of embodiment of the present disclosure;

Figure 10 shows the auto gain control method that is used for wireless communication terminal according to embodiment of the present disclosure.

Embodiment

Embodiments of the invention are described with reference to the accompanying drawings.Element of in an accompanying drawing of the present invention or a kind of execution mode, describing and characteristic can combine with element and the characteristic shown in one or more other accompanying drawing or the execution mode.Should be noted that for purpose clearly, omitted the parts that have nothing to do with the present invention, those of ordinary skills are known and the expression and the description of processing in accompanying drawing and the explanation.

Following partial content is with LTE (Long Term Evolution) the TDD system (TD-LTE system) of the 3GPP example as the TDD system, but should be appreciated that, the invention is not restricted to the TD-LTE system, also goes for similar system.

Fig. 2 shows the frame structure sketch map of TD-LTE system.Comprise three kinds of subframe structures in the TD-LTE system: sub-frame of uplink (subframe), descending sub frame and special subframe.Subframe #0, #3, #4 are descending sub frame in Fig. 1, and subframe #2 is a sub-frame of uplink, and subframe #1 is a special subframe.In the narration, with " D " sign descending sub frame, " U " identifies sub-frame of uplink below, and " S " identifies special subframe, and the current subframe type of " X " sign is unknown.The time slot that it is 0.5ms that each subframe comprises two length (slot).Special subframe is by DwPTS, and GP and UpPTS form.Main synchronizing symbol (Primary synchronization symbol; PSS) be positioned at the 3rd symbol of DwPTS; And auxilliary synchronizing symbol (Secondary synchronization symbol SSS) is positioned at last symbol of first subframe (SF#0), as shown in Figure 1.Cell searching utilizes the detection to these two synchronizing symbols to obtain frame timing and sub-district ID.

Table 1 shows several frame configurations in the TD-LTE system.

Frame configuration in the table 1TD-LTE system

The configuration numbering

The up-downgoing switching point

Subframe numbers

Cycle

0

1

2

3

4

5

6

7

8

9

0

5ms

D

S

U

U

U

D

S

U

U

U

1

5ms

D

S

U

U

D

D

S

U

U

D

2

5ms

D

S

U

D

D

D

S

U

D

D

3

10ms

D

S

U

U

U

D

D

D

D

D

4

10ms

D

S

U

U

D

D

D

D

D

D

5

10ms

D

S

U

D

D

D

D

D

D

D

6

5ms

D

S

U

U

U

D

S

U

U

D

Fig. 3 shows the position of reference signal in the frame structure of TD-LTE system.In Fig. 2, be labeled as R ₀The position be the reference signal position of port0, the position of shade is the reference signal position of port1.As shown in Figure 3, reference signal is arranged in the #0 of slot, the #4 symbol.In downstream signal, no matter have or not transfer of data, reference signal all will be sent.

Fig. 4 shows the wireless communication terminal 400 according to an embodiment of the present disclosure.

Wireless communication terminal 400 comprises that gap control unit 402, gap operating confirm 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 is carried out automatic gain control.Gap control unit 402 is configured to the startup and the end of control gap.For example; Gap control unit 402 can be based on receive the relevant signaling of GAP from the base station; Come the 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, before the GAP process finishes, adjust back to the frequency of serving BS.In addition, after the required adjusting of the VCO time, unlatchings such as notice neighboring cell search unit (not shown), channel measurement unit (not shown); And recall to institute at VCO and must close corresponding units before the time.Gap operating confirms that unit 404 is configured to the operation that will carry out in definite next gap.Pattern control unit 406 is configured to be provided with according to the operation of confirming the pattern of automatic gain control unit 408 in the next gap.In one example, the yield value adjustment cycle of automatic gain control unit under fast mode is smaller or equal to a sub-frame length, and the yield value adjustment cycle under low-speed mode is greater than a sub-frame length.

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 through following steps: to time of alien frequencies adjacent base station and frequency synchronously, and detect the ID of alien-frequency district; Based on neighboring cell search set up synchronously, ground tracking time and Frequency Synchronization further become more meticulous; Signal quality and signal interference level to the alien frequencies neighbor cell are measured.The parts that above-mentioned steps and being used to is accomplished these steps are that those skilled in the art can realize, are not described in detail here.

In one example, the gap operating operational example confirming will to carry out in the 404 determined next gaps, unit is as comprising one or more of following operation: the operation of yield value initial convergence; Main synchronizing symbol detecting operation; Auxilliary synchronizing symbol detecting operation; Yield value is restrained operation again; Channel measurement operation; And sleep operation.The operation of yield value initial convergence can be used among the GAP of GAP that begins most or recovery under sleep pattern (this moment, wireless communication system did not obtain frame regularly), carrying out the yield value convergence.Main synchronizing symbol detecting operation can be used for carrying out main synchronizing symbol and detect.Auxilliary synchronizing symbol detecting operation can be used for assisting synchronizing symbol and detect.Yield value is restrained operation again and can be used for after wireless communication terminal detects auxilliary synchronizing symbol, making the further convergence of yield value stable.Channel measurement operation can be used for the signal quality of alien frequencies neighbor cell and signal interference level are measured.After sleep operation can be used for after accomplishing channel measurement or Cell searching is temporarily failed, do not carry out the operation of relevant alien-frequency district search this moment.

The operation that pattern control unit 406 can will carry out in next gap is that the pattern of automatic gain control unit 408 is set to fast mode in the next gap under the situation of the operation of yield value initial convergence, main synchronizing symbol detecting operation or auxilliary synchronizing symbol detecting operation; The operation that in next gap, will carry out is that yield value is restrained under the situation of operation or channel measurement operation again, and the pattern of automatic gain control unit is set to low-speed mode in the next gap; The operation that in next gap, will carry out is under the situation of sleep operation, and the pattern of automatic gain control unit 408 is set to stop mode in the next gap.

Gap operating confirms that unit 404 can confirm the operation that will carry out in the next gap according to predetermined being provided with.For example; Can be arranged in advance and carry out the operation of yield value initial convergence among the 1st～L1 the GAP; In L2 GAP subsequently, carry out main synchronizing symbol detecting operation; In L3 GAP subsequently, assist the synchronizing symbol detecting 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 confirms that unit 404 also can confirm the operation that will carry out in the next gap based on the implementation status of the step of relevant alien-frequency district search in the wireless communication terminal 400.For example; Gap operating confirms that unit 404 can be used for the parts (not shown) that auxilliary synchronizing symbol detects with wireless communication terminal and communicate by letter, and accomplishes auxilliary synchronizing symbol at these parts and detects post gap operation determination unit 404 and can confirm that the operation that will carry out in the next gap is that yield value is restrained operation again.

In the present embodiment; Confirm the operation that to carry out in the 404 determined next gaps, unit according to gap operating; Mode controller 406 is adjusted to different patterns with automatic gain control unit 408, guaranteed wireless communication terminal 400 in the gap under each operating state the precision of necessary quantized signal.

Fig. 5 shows according to the automatic gain control unit in the wireless communication terminal of an embodiment of the present disclosure 500.

Automatic gain control unit 500 comprises gain maker 506, is configured to generate yield value; Variable gain amplifier 502 is configured to adjust the amplitude that receives signal and export adjusted signal according to the yield value that gain maker 506 generates; And A-D converter 504, being configured to the signal transformation from variable gain amplifier 502 outputs is digital signal.

Gain maker 506 can be through measuring the power that some time periods receive signal (through the signal behind the ADC); Compare with reference power; Generate yield value (gain) according to certain algorithm, pass to the amplitude that variable gain amplifier 502 is adjusted the analog signal that the next time period receives then.

Fig. 6 shows according to the gain maker 600 in the wireless communication terminal of an embodiment of the present disclosure.

Gain maker 600 comprises power measurement module 602, is configured to measure the power that receives signal; Power comparison module 604, the power of the reception signal that is configured to measure and target power are relatively with definite power adjustment; And average module 604, current power adjustment that is configured to confirm and previous power adjustment weighted average.

Below with the operation of each module of example introduction more specifically gain maker 600.

In one example, power measurement module 602 is for receiving signal r (i), measuring N _MeasureAverage power in the individual sampling point interval.N _MeasureIndividual sampling point time corresponding length T _MeasSuitable with the symbol lengths of use Normal CP in the TDD-LTE system, 14 T _MeasLength be a sub-frame length 1ms.The average power of asking is:

$P_{\mathrm{est}}\left(k\right)=\frac{1}{N_{\mathrm{measure}}}\underset{i=0}{\overset{N_{\mathrm{measure}}}{\mathrm{\Σ}}}{\left|r({\mathrm{kN}}_{\mathrm{measure}}+i)\right|}^2,k=\mathrm{0,1,2},...,K_{\mathrm{set}}-1$

K _SetFor 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 the power,

P _{est_max}＝max(P _est(0)，P _est(1)，...，P _est(K _set-1))

Alternatively, through logarithmic transformation, can get: P _DB=10log ₁₀(P _{Est_max}) [dB]

More than adopt K _SetIndividually record maximum in the power, the invention is not restricted to this, also can adopt K as the power of measuring _SetThe individual mean value that records power is as the power of measuring.

Power comparison module 604, with the power of the reception signal measured and target power relatively with definite power adjustment.Target power can be confirmed 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 confirmed 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 be provided with 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 then

ΔP＝P _tar-P _dB[dB]

Difference power Δ P (power adjustment just) between j measurement zone can be written as:

ΔP(j)＝P _tar(j)-P _dB(j)

Averaging unit 606 can utilize following formula with current power adjustment and the preceding weighted average of adjustment amount several times:

$\mathrm{\Δ}\stackrel{\‾}{P}\left(j\right)=\mathrm{a\ΔP}\left(j\right)+(1-a)\mathrm{\Δ}\stackrel{\‾}{P}(j-1)$

Among them, assuming

α is the forgetting factor, for different mode of the automatic gain control unit, the forgetting factor 0 ≤ α ≤ 1.

Then the final gain value is updated to

$G\left(j\right)=G(j-1)+\mathrm{\Δ}\stackrel{\‾}{P}\left[\mathrm{dB}\right].$

Be presented in the operation of automatic gain control unit under the different mode below.

In one embodiment, operation below wireless communication terminal is carried out in continuous GAP successively: yield value initial convergence operation (this operation is carried out by automatic gain control unit), main synchronizing symbol detecting operation, auxilliary synchronizing symbol detecting operation, yield value are restrained operation, channel measurement operation and sleep operation again.When wireless communication terminal was carried out the operation of yield value initial convergence, main synchronizing symbol detecting operation and auxilliary synchronizing symbol detecting operation, automatic gain control unit was set to fast mode by the pattern control unit.When wireless communication terminal execution yield value was restrained operation (this operation is carried out by automatic gain control unit) or channel measurement operation again, automatic gain control unit was set to low-speed mode by the pattern control unit; Carry out at wireless communication terminal under the situation of sleep operation, automatic gain control unit is set to stop mode by the pattern control unit.

1. fast mode

According to the frame structure shown in the table 1, the sub-frame before the special subframe must be a descending sub frame.Through 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, is determined by the device level.Usually, T _ApplyThan T _MeasK _SetMuch smaller, even can ignore.

At initial (the GAP head shown in figure) of fast mode, after for example recovering when starting up of terminal or from sleep state, elder generation is through measure adjustment (warm up) for several times, and the horizontal adjusting that alien-frequency district is received signal arrives within the ADC working range.The number of times of adjustment can be set according to ADC dynamic range and the dynamic range that receives 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 yield value of setting at random, the starting stage is carried out 3-5 yield value adjustment.Afterwards, wireless communication terminal begins to carry out the 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 the average module can be set to zero.In addition, try one's best not by peak clipping in order to guarantee signal, and a rational dynamic range, P are arranged _HRValue is 9～36dB, more preferably, is chosen as about 18～27dB.

For the TD-LTE system, the alien frequencies neighbor cell possibly be asynchronous sub-district.When not knowing the synchronizing information of alien frequencies neighbor cell, need utilize the preceding descending sub frame of special subframe to carry out yield value adjustment more frequently as far as possible.At this moment, K _SetIt is more little good more to be worth, but the setting of considering Kset should be less than the maximum time domain interval between the reference signal in order to avoid the null symbol completely that measures, with reference to Fig. 3, can be with K _SetValue is 4-5.That is to say that be to receive the maximum time domain interval of the reference signal in the signal perhaps than the big symbol lengths of maximum time domain interval that receives the reference signal in the signal measuring period with 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, at interval GP can be at fixing P to the influence of AGC in order to prevent up-downgoing _HRThe basis 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, confirm that by the disappeared ratio at peak of signal peak P more at most disappears _OffsetBig more.For example, can utilize overflow (overflowing) the output mechanism of ADC to obtain the margin value deviant.Particularly, can add up T between corresponding fast mode measurement zone _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 the overflow output function, can adopt the number of samples of full scale 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 less than the measuring period of power measurement module, adjustment cycle is 1-2 T _Meas, in this Fig. 7, ignore T in addition _ApplyIn Fig. 8, the convergence rate of yield value faster than among Fig. 7.

After auxilliary synchronizing symbol detected completion, cell search unit had detected the timing information of alien frequencies base station, carrier frequency position and sub-district ID.Trigger controller thus, and and then notice AGC unit stop fast mode, change low-speed mode over to.

When fast mode is transformed into low-speed mode, can adopt dual mode:

1. at last GAP of fast mode, the AGC yield value when GAP is finished is stored, and the terminal adjusts back to the carrier frequency of Serving cell, uses the AGC of corresponding with service base station to receive signal.Begin at next GAP, promptly the GAP that begins of low-speed mode 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 updating value before under the interior fast mode of storage GAP, N is more than or equal to 1 integer such as grade, if auxilliary synchronizing symbol detects successfully in this GAP, then fast mode terminates in this GAP.Change low-speed mode at next GAP, at this moment use corresponding auxilliary synchronizing symbol to detect the gain of AGC gain corresponding between the location of peak value as this GAP.

2. low-speed mode

Fig. 9 shows the operation according to automatic gain control under the low-speed mode of embodiment of the present disclosure.In low-speed mode, obtained frame and regularly (accomplished main synchronizing symbol and detected and assist the synchronizing symbol detection).At this moment, AGC carries out the measurement of the AGC yield value of low speed according to frame timing information in subframe 0 or subframe 5.Each GAP only uses a yield value, and the yield value (gain) that previous GAP generates uses for the automatic gain control unit (the for example variable gain amplifier in the automatic gain control unit) of next GAP.When channel measurement operation finished, wireless communication terminal was stored the AGC yield value of corresponding alien frequencies adjacent base station.GAP latter end, VCO adjust back to the carrier frequency of serving BS, use the AGC gain of serving BS to receive signal.When next GAP arrived, wireless communication terminal 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 the average module is 1～9 with the ratio of the weight of current power adjustment.K _SetBe 14, just be a sub-frame measuring period of power measurement module, P _HRValue is 9-36dB, more preferably is 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 provided with by the pattern control unit.In another embodiment, the pattern control unit only is provided with the pattern of automatic gain control unit and/or the stage in the pattern, and the parameter under each mode of operation can be arranged in the automatic gain control unit in advance.

Figure 10 shows the auto gain control method that is used for wireless communication terminal according to embodiment of the present disclosure.

In step 1002, confirm the operation that to carry out in the next gap.In step 1004, the pattern of automatic gain control operation in the next gap is set according to the operation of confirming.In step 1006, the reception signal of wireless communication terminal is carried out the automatic gain control operation according to the pattern of the automatic gain control that is provided with.

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 said automatic gain control operation under fast mode do not carry out the automatic gain control operation less than the yield value adjustment cycle under low-speed mode under stop mode.

In one example, the yield value adjustment cycle of automatic gain control operation under fast mode is smaller or equal to a sub-frame length, and the yield value adjustment cycle under low-speed mode is greater than a sub-frame length.

In one example, the operation that will carry out in the next gap comprises one or more of following operation: the operation of yield value initial convergence; Main synchronizing symbol detecting operation; Auxilliary synchronizing symbol detecting operation; Yield value is restrained operation again; Channel measurement operation; And sleep operation.The pattern that automatic gain control operation in the next gap is set is included under the situation that the operation that will carry out in the next gap is the operation of yield value initial convergence, main synchronizing symbol detecting operation or auxilliary synchronizing symbol detecting operation, and the pattern of automatic gain control operation is set to fast mode in the next gap; The operation that in next gap, will carry out is that yield value is restrained under the situation of operation or channel measurement operation again, and the pattern of automatic gain control operation is set to low-speed mode in the next gap; The operation that in next gap, will carry out is under the situation of sleep operation, and the pattern of automatic gain control operation is set to stop mode in the next gap.

In one example, the automatic gain control operation is included in and in each gap, only uses a yield value under the low-speed mode, and this yield value generates in a last gap.

In one example, the automatic gain control operation comprises: generate yield value; Adjust the amplitude that receives signal according to yield value; And adjusted signal carried out analog to digital conversion to be transformed to digital signal.In one example, generating yield value comprises: measure the power that receives signal; With the power of the reception signal measured and target power relatively with definite power adjustment; And the current power adjustment that will confirm and previous power adjustment weighted average.

In one example, when the automatic gain control operation was fast mode, the weight of previous power adjustment was set to zero.

In one example, what target power can be for maximum power and margin value is poor, and when the automatic gain control operation was fast mode, margin value was 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; The margin value deviant increases along with the increase of the ratio of the signal at the peak that in analog to digital conversion, disappeared; When the automatic gain control operation is fast mode; Margin value is set to 9～36dB, more preferably 18～27dB.

In one example; When the automatic gain control operation is fast mode; The maximum time domain interval that is set to receive the reference signal in the signal measuring period in the power of measurement reception signal is perhaps than the big symbol lengths of maximum time domain interval that receives the reference signal in the 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 said automatic gain control operation is fast mode; The maximum time domain interval that is set to receive the reference signal in the signal measuring period in the power of said measurement reception signal is perhaps than the big symbol lengths of maximum time domain interval that receives the reference signal in the signal; Overlap each other each measuring period, and the yield value adjustment cycle of said automatic gain control operation is less than said measuring period.

In one example, when the automatic gain control operation was low-speed mode, the weight of previous power adjustment was 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 the automatic gain control operation is low-speed mode and, margin value is set to 9～36dB, more preferably is 18～27dB.

In one example, when the automatic gain control operation is low-speed mode, be set to a sub-frame measuring period in the power of measurement reception signal.

Detail about the operation among Figure 10 can repeat no more with reference to the description that combines Fig. 4～Fig. 9 to wireless communication terminal here.

In an embodiment of the present invention, wireless communication terminal can be a mobile phone, pocket computer, PDA, data card, USB rod, vehicle-mounted receiver, intelligent appliance, the electronic equipment of any every loading LTE chip such as intelligence instrument.

Above execution modes more of the present invention have been carried out detailed description.Accessible like those of ordinary skill in the art institute; Whole or any step 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; Realize with hardware, firmware, software or their combination; This is that those of ordinary skills' their basic programming skill of utilization under the situation of understanding content of the present invention just can be realized, does not therefore need to specify at this.

In addition, it is obvious that, when relating to possible peripheral operation in the superincumbent explanation, will use any display device and any input equipment, corresponding interface and the control program that link to each other with any computing equipment undoubtedly.Generally speaking; The hardware of the various operations in the related hardware in computer, computer system or the computer network, software and the realization preceding method of the present invention, firmware, software or their combination promptly constitute equipment of the present invention and each building block thereof.

Therefore, based on above-mentioned understanding, the object of the invention can also be realized through program of operation or batch processing on any messaging device.Said messaging device can be known common apparatus.Therefore, the object of the invention also can be only through providing the program product that comprises the program code of realizing said method or equipment to realize.That is to say that such program product also constitutes the present invention, and storage or the medium that transmits such program product also constitute the present invention.Obviously, said storage or transmission medium can be well known by persons skilled in the art, and perhaps therefore the storage or the transmission medium of any kind that is developed in the future also there is no need at this various storages or transmission medium to be enumerated one by one.

In equipment of the present invention and method, obviously, after can decomposing, make up and/or decompose, each parts or each step reconfigure.These decomposition and/or reconfigure and to 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 following the instructions naturally 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 to the specific embodiment of the invention; Characteristic to a kind of execution mode is described and/or illustrated can be used in one or more other execution mode with identical or similar mode; Combined with the characteristic in other execution mode, or substitute the characteristic in other execution mode.

Should stress that term " comprises/comprise " existence that when this paper uses, refers to characteristic, key element, step or assembly, but not get rid of the existence of one or more further feature, key element, step or assembly or additional.

Though described the present invention and advantage thereof in detail, be to be understood that and under not exceeding, can carry out various changes, alternative and conversion the situation of the appended the spirit and scope of the present invention that claim limited.And the application's scope is not limited only to the specific embodiment of the described process of specification, equipment, means, method and step.The one of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use according to the present invention and carry out and process, equipment, means, method or step essentially identical function of corresponding embodiment described herein or acquisition result essentially identical with it, existing and that will be developed in the future.Therefore, appended claim is intended in their scope, comprise such process, equipment, means, method or step.

About comprising the execution mode of above each embodiment, following remarks is also disclosed.

Remarks

1. wireless communication terminal comprises:

Automatic gain control unit is configured to the reception signal of said wireless communication terminal is carried out automatic gain control;

Gap control unit is configured to the startup and the end of control gap;

Gap operating is confirmed the unit, is configured to the operation that will carry out in definite next gap; And

The pattern control unit is configured to be provided with according to said definite operation the pattern of automatic gain control unit in the next gap.

2. like remarks 1 described wireless communication terminal; Wherein, The pattern of said automatic gain control unit comprises fast mode, low-speed mode and stop mode; The yield value adjustment cycle of said automatic gain control unit under fast mode is less than the yield value adjustment cycle under low-speed mode, and said automatic gain control unit does not carry out automatic gain control under stop mode.

3. like remarks 2 described wireless communication terminals, the yield value adjustment cycle of wherein said automatic gain control unit under fast mode is smaller or equal to a sub-frame length, and the yield value adjustment cycle under the low-speed mode is greater than a sub-frame length.

4. like remarks 2 described wireless communication terminals, the operation that will carry out in the wherein said next gap comprises one or more of following operation: the operation of yield value initial convergence; Main synchronizing symbol detecting operation; Auxilliary synchronizing symbol detecting operation; Yield value is restrained operation again; Channel measurement operation; And sleep operation, and

The operation that said pattern control unit will carry out in next gap is that the pattern of automatic gain control unit is set to fast mode in the next gap under the situation of the operation of yield value initial convergence, main synchronizing symbol detecting operation or auxilliary synchronizing symbol detecting operation; The operation that in next gap, will carry out is that yield value is restrained under the situation of operation or channel measurement operation again, and the pattern of automatic gain control unit is set to low-speed mode in the next gap; The operation that in next gap, will carry out is under the situation of sleep operation, and the pattern of automatic gain control unit is set to stop mode in the next gap.

5. like remarks 2 described wireless communication terminals, wherein said automatic gain control unit only uses a yield value in each gap under low-speed mode, and this yield value generates in a last gap.

6. like remarks 2 described wireless communication terminals, wherein said automatic gain control unit comprises:

The gain maker is configured to generate yield value;

Variable gain amplifier is configured to adjust the amplitude that receives signal and export adjusted signal according to the yield value that said gain maker generates; And

A-D converter, being configured to the signal transformation from said variable gain amplifier output is digital signal,

Wherein said gain maker comprises:

Power measurement module is configured to measure the power that receives signal;

The power comparison module, the power of the reception signal that is configured to measure and target power are relatively with definite power adjustment; And

Average module, current power adjustment that is configured to confirm and previous power adjustment weighted average.

7. like remarks 6 described wireless communication terminals, wherein when said automatic gain control unit was in fast mode, the weight of the previous power adjustment in the said average module was set to zero.

8. like remarks 6 described wireless communication terminals, wherein said target power is maximum quantized power and margin value poor of said A-D converter, and when said automatic gain control unit was in fast mode, said margin value was set to 9～36dB.

9. like remarks 6 described wireless communication terminals; Wherein said target power is that the maximum quantized power of said A-D converter deducts margin value and margin value deviant sum; Said margin value deviant increases along with the increase of the ratio of the signal at the peak that in said A-D converter, disappeared; When said automatic gain control unit was in fast mode, said margin value was set to 9～36dB.

10. like remarks 8 or 9 described wireless communication terminals, wherein when said automatic gain control unit was in fast mode, said margin value was set to 18～27dB.

11. like remarks 6 described wireless communication terminals; Wherein when said automatic gain control unit is in fast mode; The maximum time domain interval that is set to receive the reference signal in the signal measuring period of said power measurement module is perhaps than the big symbol lengths of maximum time domain interval that receives the reference signal in the signal; Each measuring period non-overlapping copies, the yield value adjustment cycle of said automatic gain control unit is more than or equal to the measuring period of said power measurement module.

12. like remarks 6 described wireless communication terminals; Wherein when said automatic gain control unit is in fast mode; The maximum time domain interval that is set to receive the reference signal in the signal measuring period of said power measurement module is perhaps than the big symbol lengths of maximum time domain interval that receives the reference signal in the signal; Overlap each other each measuring period, and the yield value adjustment cycle of said automatic gain control unit is less than the measuring period of said power measurement module.

13. like remarks 6 described wireless communication terminals, wherein when said automatic gain control unit was in low-speed mode, the weight of the previous power adjustment in the said average module was 1～9 with the ratio of the weight of current power adjustment.

14. like remarks 6 described wireless communication terminals; Wherein said target power is maximum quantized power and margin value poor of said A-D converter; When said automatic gain control unit is in low-speed mode and said wireless communication terminal be in when obtaining frame and regularly not obtaining the state of frame configuration, said margin value is set to 9～36dB.

15. like remarks 14 described wireless communication terminals, when said automatic gain control unit is in low-speed mode and said wireless communication terminal be in when obtaining frame and regularly not obtaining the state of frame configuration, said margin value is set to 18～27dB.

16., wherein when said automatic gain control unit is in low-speed mode, be set to a sub-frame measuring period of said power measurement module like remarks 6 described wireless communication terminals.

17. an auto gain control method that is used for wireless communication terminal comprises:

Confirm the operation that to carry out in the next gap;

The pattern of automatic gain control operation in the next gap is set according to said definite operation; And

According to the pattern of the automatic gain control that is provided with the reception signal of said wireless communication terminal is carried out the automatic gain control operation.

18. like remarks 17 described methods; The pattern of said automatic gain control operation comprises fast mode, low-speed mode and stop mode; The yield value adjustment cycle of said automatic gain control operation under fast mode do not carry out the automatic gain control operation less than the yield value adjustment cycle under low-speed mode under stop mode.

19. like remarks 18 described methods, the yield value adjustment cycle of wherein said automatic gain control operation under fast mode is smaller or equal to a sub-frame length, and the yield value adjustment cycle under low-speed mode is greater than a sub-frame length.

20. like remarks 18 described methods, the operation that will carry out in the wherein said next gap comprises one or more of following operation: the operation of yield value initial convergence; Main synchronizing symbol detecting operation; Auxilliary synchronizing symbol detecting operation; Yield value is restrained operation again; Channel measurement operation; And sleep operation, and

The said pattern that automatic gain control operation in the next gap is set is included under the situation that the operation that will carry out in the next gap is the operation of yield value initial convergence, main synchronizing symbol detecting operation or auxilliary synchronizing symbol detecting operation, and the pattern of automatic gain control operation is set to fast mode in the next gap; The operation that in next gap, will carry out is that yield value is restrained under the situation of operation or channel measurement operation again, and the pattern of automatic gain control operation is set to low-speed mode in the next gap; The operation that in next gap, will carry out is under the situation of sleep operation, and the pattern of automatic gain control operation is set to stop mode in the next gap.

Claims (10)

1. A wireless communication terminal, comprising: an automatic gain control unit configured to perform automatic gain control on the received signal of the wireless communication terminal; a gap control unit configured to control initiation and termination of the gap; a gap operation determining unit configured to determine an operation to be performed in the next gap; and A mode control unit configured to set the mode of the automatic gain control unit in the next gap according to the determined operation. 2. The wireless communication terminal according to claim 1, wherein the modes of the automatic gain control unit include a high-speed mode, a low-speed mode and a stop mode, and the gain value adjustment period of the automatic gain control unit in the high-speed mode is less than that in The gain value adjustment period in the low speed mode, the automatic gain control unit does not perform automatic gain control in the stop mode. 3. The wireless communication terminal according to claim 2, wherein the gain adjustment period of the automatic gain control unit in the high-speed mode is less than or equal to a subframe length, and the gain value adjustment period in the low-speed mode is greater than a subframe length . 4. The wireless communication terminal according to claim 2, wherein the operations to be performed in the next gap include one or more of the following operations: gain value initial convergence operation; primary synchronization symbol detection operation; secondary synchronization symbol detection operation; gain value reconvergence operation; channel measurement operation; and sleep operation, and When the operation to be performed by the mode control unit in the next gap is the initial convergence operation of the gain value, the primary synchronization symbol detection operation or the secondary synchronization symbol detection operation, the mode of the automatic gain control unit in the next gap is set to a high-speed mode ; In the case that the operation to be performed in the next gap is a gain value reconvergence operation or a channel measurement operation, set the mode of the automatic gain control unit in the next gap to the low speed mode; the operation to be performed in the next gap is a sleep operation In the case of , set the mode of the automatic gain control unit in the next gap to stop mode. 5. The wireless communication terminal according to claim 2, wherein the automatic gain control unit uses only one gain value in each slot in the low speed mode, the gain value being generated in the previous slot. 6. The wireless communication terminal as claimed in claim 2, wherein the automatic gain control unit comprises: a gain generator configured to generate a gain value; a variable gain amplifier configured to adjust the amplitude of the received signal according to the gain value generated by the gain generator and output the adjusted signal; and an analog-to-digital converter configured to convert the signal output from the variable gain amplifier into a digital signal, Wherein said gain generator comprises: a power measurement module configured to measure the power of the received signal; a power comparison module configured to compare the measured power of the received signal with a target power to determine a power adjustment; and The averaging module is configured to perform a weighted average of the determined current power adjustment amount and the previous power adjustment amount. 7. The wireless communication terminal according to claim 6, wherein when the automatic gain control unit is in the high speed mode, the weight of the previous power adjustment amount in the averaging module is set to zero. 8. The wireless communication terminal according to claim 6, wherein when the automatic gain control unit is in the high-speed mode, the measurement cycle of the power measurement module is set to the maximum time domain interval of the reference signal in the received signal or the ratio of the received signal The maximum time domain interval of the reference signal in the signal is longer than one symbol length, each measurement period does not overlap each other, and the gain value adjustment period of the automatic gain control unit is greater than or equal to the measurement period of the power measurement module. 9. The wireless communication terminal according to claim 6, wherein when the automatic gain control unit is in the high-speed mode, the measurement cycle of the power measurement module is set to the maximum time domain interval of the reference signal in the received signal or the ratio of the received signal The maximum time domain interval of the reference signal in the signal is longer than one symbol length, each measurement period overlaps with each other, and the gain value adjustment period of the automatic gain control unit is shorter than the measurement period of the power measurement module. 10. The wireless communication terminal according to claim 6, wherein when the automatic gain control unit is in the low-speed mode, the ratio of the weight of the previous power adjustment amount in the averaging module to the weight of the current power adjustment amount is 1~9. the

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