CN100574295C - The receiving system and the method for reseptance thereof that comprise digital trickle automatic gain controller - Google Patents
The receiving system and the method for reseptance thereof that comprise digital trickle automatic gain controller Download PDFInfo
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- CN100574295C CN100574295C CNB2004100679555A CN200410067955A CN100574295C CN 100574295 C CN100574295 C CN 100574295C CN B2004100679555 A CNB2004100679555 A CN B2004100679555A CN 200410067955 A CN200410067955 A CN 200410067955A CN 100574295 C CN100574295 C CN 100574295C
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Abstract
The present invention relates to comprise the receiving system of digital trickle automatic gain controller, particularly use, for realizing the Apparatus and method for of more accurate gain controlling with existing analog gain controller.According to the present invention, comprise that following part constitutes, compared with existing automatic gain controller, more careful and more correctly move automatic gain and control, the negative effect that automatic gain controller is produced to whole system reaches and minimizes, and has the effect that improves receptivity.The part that comprises has, pass through automatic gain controller, the conversion of signals of simulation field ride gain be digital signal analog-digital converter, the signal of above-mentioned conversion is carried out counter modulation, be converted to baseband signal demodulator, obtain the input of above-mentioned baseband signal and outside recovery value of symbol, at the digital trickle automatic gain controller of digital field ride gain.
Description
Technical field
The present invention relates to digital trickle automatic gain control, particularly use, for carrying out the Apparatus and method for of more accurate gain controlling with existing radio frequency and intermediate-frequency gain controller.
Background technology
With regard to digital broadcast received, the effect of automatic gain controller was quite important.Automatic gain controller is prevent the receiver performance that causes because of signal strength signal intensity gap that area or surrounding enviroment occur low, and guarantees bigger dynamic range (Dynamic range).
Fig. 1 is the some that expression comprises the system for receiving digital broadcasts of such automatic gain controller.
As shown in Figure 1, the gain proportion of the tuner 1 of radio frequency and intermediate-frequency gain distribution automatic gain controller 4 adjustment surface acoustic wave (SAW) filters 2 front ends and the intermediate frequency automatic gain control loudspeaker 3 of rear end makes received signal keep certain power.
Like this, adjust in the process of radio frequency and intermediate-frequency gain,, just significantly increase the amplify signal amplitude of end (not have to illustrate) reception of tuner 1 internal radio frequency if the proportion of above-mentioned rf gain is bigger.At this moment, because of on the noise figure characteristics, noise is to append on a small quantity, and it is less that the signal to noise ratio of signal band reduces amplitude.
If but have more adjacent channel or the bigger channel of signal strength signal intensity that exerts an influence to receive channel, can obtain bigger gain at above-mentioned surface acoustic wave filter 2 front ends, take place saturated with the radio frequency of this above-mentioned tuner 1 inside end that amplifies, cause signal to be distorted, the signal to noise ratio of signal band is sharply descended.
On the contrary, if control the proportion that loudspeaker 3 is heightened intermediate-frequency gain by the intermediate frequency automatic gain of above-mentioned surface acoustic wave filter 2 rear ends, it is saturated just can to prevent that above-mentioned radio frequency from amplifying and holding, but can reduce the signal to noise ratio of signal band.
So above-mentioned radio frequency and intermediate-frequency gain are distributed the gain of automatic gain controller 4 with suitable distribution radio frequency and intermediate frequency, make the gain controlling of receiver reach the best and turn to principle.
Distribute such radio frequency and intermediate frequency the inside formation of automatic gain controller 4 to be illustrated in additional Fig. 2, the example that embodies actual hardware is illustrated in additional Fig. 3.
As shown in Figures 2 and 3, carry out band signal is controlled error detector 41 inside by automatic gain the power instrument that passes through of digital translation by above-mentioned Fig. 1 analog-digital converter (ADC) 5, replace with performance number, above-mentioned performance number by and automatic gain control criterion value (standard signal performance number) between poor, export with the gain error value.
The gain error value of above-mentioned output is accumulated at IF loop filter 42, this value process middle frequency difference/and digital analog converter 43, be converted to analog signal, and the control intermediate-frequency gain.
In addition, the value of above-mentioned accumulative total will be input to and postpone automatic gain control part 44, obtain and radio frequency automatic gain control criterion value between poor, and be accumulated at radio frequency loop filter 45.
The value that is accumulated at above-mentioned radio frequency loop filter 45 is converted to analog signal through radiofrequency difference/and digital analog converter 46, the control rf gain (above-mentioned intermediate frequency and radiofrequency difference/and the inside of digital analog converter 43,46 constitute please refer to additional Fig. 4).
Above-mentioned intermediate frequency and radio frequency loop filter 42,45 are for adjusting automatic gain Control and Feedback loop band, and at this moment the improper value multiplication by constants, for reducing hardware, generally uses shift register (RSHIFT).
Like this, when distributing the automatic gain dispensing controller to detect gain error, only use the signal power of input signal for the intermediate frequency of the prior art of the instantaneous power of suitably regulating channel and rf gain.
But when having the dual imaging composition of multi-path on the input signal, there is such problem in the form input input signal because of with main path signal and multi-path signal combination, that is, the equalizer of rear end (not diagram) requires to correct to this.
In addition, the attenuation channel that changes according to the time in the phase place of dual imaging is according to the phase place of dual imaging, the signal power of input signal changes, therefore, if use existing gain error detection method, for compensating these, need significantly adjust the size of input signal.At this moment, because of automatic gain controller,, also there is the problem of the negative effect that may produce the performance number variation at the rear end equalizer to simple phase change.
Summary of the invention
So, the objective of the invention is to be born for solving such prior art problem, use digital trickle automatic gain controller with the output of equalizer, reduce the influence that existing automatic gain controller produces for whole receiving system, and improve receptivity with this.
To achieve these goals, the receiving system that comprises automatic gain controller of the present invention comprises that following part constitutes characteristics: simulation field the conversion of signals of the gain by automatic gain controller control be digital signal analog-digital converter, above-mentioned digital signal is carried out counter modulation, be converted to baseband signal demodulator, obtain the input of above-mentioned baseband signal and outside restored symbol value, at the digital trickle automatic gain controller of digital field ride gain.
The recovery value of symbol of said external is that the channel equalizer of the trickle automatic gain controller of above-mentioned numeral rear end or the output valve of phase tracker are characteristics.
The trickle automatic gain controller of above-mentioned numeral is to comprise that following part constitutes characteristics: obtain the input of the baseband signal of the output of above-mentioned restored symbol value and the trickle automatic gain controller of above-mentioned numeral-correction gain, detect the gain error value automatic gain ride gain error detector, obtain the input of above-mentioned gain error value, add up and correct, the baseband signal with above-mentioned demodulator output on duty of the loop filter of the value of gain, above-mentioned correction gain is corrected in output, produces the multiplier of the baseband signal of correcting gain.
Also comprise from the input of the controlled signal in outside, select above-mentioned baseband signal or correct in the baseband signal of gain one, and the multipath conversion portion of output constitutes characteristics.
Above-mentioned automatic gain ride gain error detector is to comprise that following part constitutes characteristics: obtain the input of above-mentioned restored symbol value, detect the decision symbol wrong detection unit of decision symbol improper value, obtain the baseband signal of above-mentioned correction gain and the input of automatic gain control criterion performance number, detect the baseband signal gain error test section of gain error value, in above-mentioned decision symbol improper value and baseband signal gain error value, above-mentioned decision symbol improper value multiply by to judging which mistake has the constant value K1 that bigger proportion tentatively determines, reaches above-mentioned baseband signal gain error the 1st multiplier of thinking the constant value K2 that judges which mistake should have bigger proportion and tentatively determine on duty, obtain the absolute value portion of the absolute value of the decision symbol improper value that multiply by above-mentioned K1 value, multiply by the 2nd multiplier of baseband signal gain error value (absolute value of above-mentioned decision symbol improper value multiply by above-mentioned K2 value), add the output valve and the adder that is multiplied by the decision symbol improper value of above-mentioned K1 value of above-mentioned the 2nd multiplier.
Above-mentioned decision symbol test section is to comprise the input that obtains above-mentioned restored symbol value, with certain grade point wave absorption, judge its value slicing machine, obtain poor between above-mentioned decision content and above-mentioned restored symbol, the subtracter that produces the decision symbol improper value constitutes characteristics.
Above-mentioned baseband signal gain error test section is to comprise that following part constitutes characteristics: obtain the input of the baseband signal of above-mentioned correction, and carry out power 2 times, be converted to performance number the power instrument, obtain the performance number of above-mentioned conversion and poor between the automatic gain control criterion performance number of back input be set, detect the subtracter of baseband signal gain error value.
The trickle automatic gain of numeral of the present invention control method of reseptance is to comprise as the next stage constituting characteristics: the conversion of signals of simulation field ride gain be digital signal stage, the digital signal of above-mentioned conversion is carried out counter modulation, be converted to baseband signal stage, obtain the input of above-mentioned baseband signal and restored symbol value, correct the stage of gain in digital field.
As mentioned above, the trickle automatic gain controller of numeral of the present invention is than existing automatic gain controller, move the control of more careful and more accurate automatic gain, make automatic gain control the negative effect that produces to whole system and reach and minimize, also have the effect that improves receptivity.
Description of drawings
Fig. 1 is the integration map of receiving system some that expression comprises the automatic gain controller of prior art;
Fig. 2 is the inner integration map that constitutes of the automatic gain controller of expression prior art;
Fig. 3 is the integration map of the automatic gain controller actual hardware configuration example of expression prior art;
Fig. 4 be the automatic gain controller of expression prior art inner poor/with the integration map of digital analog converter internal structure;
Fig. 5 is that expression comprises the integration map that the receiving system of the trickle automatic gain controller of numeral of the present invention constitutes;
Fig. 6 is the trickle automatic gain controller internal structure figure of expression numeral of the present invention;
Fig. 7 represents the inner automatic gain ride gain of the trickle automatic gain controller of numeral of the present invention error detector internal structure figure in detail.
-accompanying drawing major part symbol description-
100: tuner 200: surface acoustic wave filter
300: intermediate frequency loudspeaker 400: automatic gain controller
500: analog-digital converter 600: the direct current arrester
700: demodulator 800: synchronization portion
900: digital trickle automatic gain controller
1000: Xin Daojunhengqi ﹠amp; Xiang Weigenzongqi ﹠amp; Error correction portion forward
Embodiment
Formation and effect to the embodiment of the invention is elaborated below with reference to accompanying drawings.
Fig. 5 is that expression comprises the integration map that the receiving system of the trickle automatic gain controller of numeral of the present invention constitutes.As shown in Figure 5, the receiving system that comprises the trickle automatic gain controller 900 of numeral of the present invention constitutes with following part: obtain the input by the radiofrequency signal of antenna transmission, after the frequency with the tuning selection channel that required, be converted to the tuner 100 of intermediate-freuqncy signal output, eliminate surface acoustic wave (SAW) filter 200 of adjacent channel interference signal and noise signal from the intermediate-freuqncy signal of above-mentioned conversion, for the intermediate frequency automatic gain that the intermediate-freuqncy signal that enlarges above-mentioned elimination interference signal gains is controlled loudspeaker 300, is the analog signal conversion that receives the analog-digital converter 500 of digital signal, obtain the input of the digital passband signal of above-mentioned conversion, the automatic gain controller 400 that distributes the gain of radio frequency and intermediate-freuqncy signal, obtain the input of the digital signal of above-mentioned conversion, eliminate the direct current arrester 600 of direct current composition, the signal of the above-mentioned elimination direct current of demodulation composition, the demodulator 700 of output baseband signal, produce the synchronization portion 800 of synchronizing signal, the trickle automatic gain controller 900 of numeral of the present invention, be the incomplete factor of compensation, the channel equalizer 1000 that the linearity of contingent dual imaging or frequency distortion and so on is distorted because of transfer channel or receiver, be phase tracker and the portion of error correction forward 1000 that adjusts its rear end phase place for correcting a mistake.
Like this in the receiving system of Gou Chenging, the trickle automatic gain controller 900 of numeral of the present invention is as the automatic gain control of digital field, obtain the input of the restored symbol value of the baseband signal of output valve-correction of the trickle automatic gain controller of above-mentioned numeral and rear end channel equalizer or phase tracker 1000 outputs, detect the gain error value, and utilize above-mentioned gain error value, correct the signal form of gain with output and make action.
To be described in more detail the formation and the action relationships of so digital trickle automatic gain controller 900 by additional drawing below.
Fig. 6 is the inner integration map that constitutes of the trickle automatic gain controller of expression numeral of the present invention.
As shown in Figure 6, the trickle automatic gain controller 900 of numeral constitutes with following part: serve as the automatic gain ride gain error detector 910 that detects gain error, obtain the input of the gain error value of above-mentioned detection, the loop filter 920 that adds up and correct, the baseband signal with demodulator 700 outputs on duty of above-mentioned correction gain produces and corrects the multiplier 930 of the baseband signal that gains, be one multipath conversion portion 940 in the baseband signal of the baseband signal of selecting 700 outputs of above-mentioned demodulator or above-mentioned correction gain, the delayer 950 that postpones the signal of above-mentioned multipath conversion portion 940 outputs.
In the formation of digital trickle automatic gain controller 900 like this, above-mentioned automatic gain ride gain error detector 910 plays a part such, promptly, the input that obtains correcting the baseband signal value and the automatic gain power controlling standard value of gain and pass through rear end channel equalizer 1000 restored symbol values detects automatic gain ride gain improper value.
That is, above-mentioned automatic gain ride gain error detector 910 detects the automatic gain ride gain improper value that can be described as core of the present invention.
The inner formation of above-mentioned automatic gain ride gain error detector is illustrated in additional Fig. 7.
As shown in Figure 7, automatic gain ride gain error detector 910 constitutes with following part: the input of the value of symbol that is restored, detect the decision symbol wrong detection unit 911 of decision symbol improper value, obtain correcting the input of the baseband signal and the automatic gain control criterion performance number of gain, detect the baseband signal gain error test section 912 of the baseband signal gain error value of correcting gain, multiply by respectively in above-mentioned decision symbol improper value and baseband signal gain error value, have the K1 that bigger proportion tentatively determines and the multiplier 913 of K2 value for judging which mistake, 914, obtain the absolute value portion 915 of the absolute value of the decision symbol improper value that is multiplied by above-mentioned K1 value, the absolute value of the decision symbol improper value that above-mentioned K1 value is taken advantage of multiply by the multiplier 916 of the baseband signal gain error value that above-mentioned K2 value taken advantage of, add the output valve of above-mentioned multiplier 916 and the adder 917 of the decision symbol improper value that above-mentioned K1 value is taken advantage of.
The following describes the action relationships of the automatic gain ride gain error detector 910 of such formation.
At first, if the output valve of the digital trickle automatic gain controller 900-baseband signal of correction gain and the output-restored symbol value of channel equalizer or phase tracker 1000 are input to automatic gain ride gain error detector 910, the baseband signal of above-mentioned correction gain and above-mentioned restored symbol value detect its gain error values at baseband signal gain error test section 912 and decision symbol wrong detection unit 911 respectively, and (above-mentioned decision symbol improper value also can be called the gain error value, in the explanation of back, even this summary uses simultaneously, also has equivalent).
Promptly, the baseband signal of above-mentioned correction gain is carried out power 2 times by above-mentioned baseband signal gain error test section 912 inner power instrument 912a, and replace with performance number, replace with like this that performance number is obtained and automatic gain control criterion performance number between poor, output baseband signal gain error value.
In addition, above-mentioned restored symbol value is certain grade with the slicing machine 911a wave absorption of decision symbol wrong detection unit 911 inside, and by and signals between poor, detect the output of decision symbol improper value.
Each gain error value of obtaining like this multiply by respectively to judging which mistake should have constant value-K1 and K2 value that bigger proportion tentatively determines.
The gain error value of being taken advantage of because of above-mentioned K1 value might be a negative, after absolute value portion 915 obtains absolute value, multiply by the gain error value that above-mentioned K2 value is taken advantage of, and output, this value adds together with the gain error value that above-mentioned K1 is taken advantage of again, finally exports with the gain error value.
Like this, if the decision symbol improper value of obtaining with above-mentioned slicing machine 911a is little, the gain error value of finally obtaining just is subjected to the bigger influence of this value relatively; If above-mentioned decision symbol improper value is big, just be subjected to the bigger influence of obtaining with baseband signal of gain error value relatively.
So, under the big situation of above-mentioned decision symbol improper value, adjust gain error in the mode of utilizing baseband signal power; Under the little situation of above-mentioned decision symbol improper value, in order to the trickle adjustment gain error of decision symbol improper value with above-mentioned slicing machine 911a.
This expression, utilize the improper value of baseband signal power mode to multiply by the absolute value of decision symbol mistake, detect the gain error value, and after according to the state (signal to noise ratio) of the recovery symbol of equalizer or phase tracker 1000 rear ends, adjust and utilize wrong proportion between the baseband signal power mode.
That is, the final gain improper value of automatic gain ride gain error detector 910 outputs can be put in order and be following routine mathematical expression.
[mathematical expression 1]
Final gain mistake=K1* decision symbol mistake+K2*| decision symbol mistake | * baseband signal power gain mistake
Like this, if obtain the gain error value, even channel status (signal to noise ratio) is better, also can reduces the channel power that phase change is caused and change, automatic gain control is made a response, and adjusts the negative effect of power and so on.
Afterwards, the above-mentioned gain error value of obtaining is accumulated at the loop filter 920 of Fig. 6, and correction gains.
At this moment, the RSHIFT register 920a of above-mentioned loop filter 920 inside obtains the input into the decision bandwidth control signal from the outside, the bandwidth of decision loop, and according to the bandwidth of above-mentioned decision, above-mentioned gain error value is by integrator 920b accumulative total, and correction gains.
Above-mentioned by loop filter 920 accumulative totals, the value of correcting gain multiply by the baseband signal of demodulator 700 outputs by multiplier 930, produces the baseband signal of correcting gain.After the baseband signal of above-mentioned correction gain is fed back again, be used for the detection of automatic gain ride gain mistake, equalizer and the phase tracker of exporting to the rear end through multipath conversion portion 940 reach error correction portion 1000 forward.
At this moment, above-mentioned multipath conversion portion 940 plays a part such, that is, obtain the input of the straight-through control signal of signal from the outside, an output in the baseband signal that the correction of selecting the trickle automatic gain controller 900 of above-mentioned numeral to export gains or the baseband signal of demodulator 700 outputs.
Simultaneously, the present invention goes for wire-wireless communication fields such as VSB, QAM, QPSK, OFDM receiver.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.
Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
Claims (5)
1, a kind of receiving system that comprises digital trickle automatic gain controller, it comprises:
In simulation field is the conversion of signals by the automatic gain controller ride gain analog-digital converter of digital signal;
Above-mentioned digital signal is carried out counter modulation, be converted to the demodulator of baseband signal;
Obtain the channel equalizer of above-mentioned baseband signal and the trickle automatic gain controller of above-mentioned numeral rear end or the input of the restored symbol value that phase tracker is exported, at the digital trickle automatic gain controller of digital field ride gain.
2, the receiving system that comprises digital trickle automatic gain controller as claimed in claim 1 is characterized in that, the trickle automatic gain controller of above-mentioned numeral comprises:
Obtain the input of baseband signal of the correction gain of the trickle automatic gain controller of above-mentioned restored symbol value and above-mentioned numeral output, detect the automatic gain ride gain detector of gain error value;
Obtain the input of above-mentioned gain error value, and add up and correct, the loop filter of the value of gain is corrected in output;
The baseband signal with above-mentioned demodulator output on duty of above-mentioned correction gain produces the multiplier of correcting the baseband signal that gains.
3, a kind of method of reseptance that comprises the receiving system of digital trickle automatic gain controller as claimed in claim 1, it comprises:
Is the conversion of signals of simulation field ride gain the stage of digital signal;
Above-mentioned digital signal is carried out counter modulation, be converted to the stage of baseband signal;
Obtain the channel equalizer of above-mentioned baseband signal and the trickle automatic gain controller of above-mentioned numeral rear end or the input of the restored symbol value that phase tracker is exported, in the stage of digital field ride gain.
4, method of reseptance as claimed in claim 3 is characterized in that, the above-mentioned stage in the digital field ride gain comprises:
Obtain the input of the baseband signal of above-mentioned restored symbol value and above-mentioned correction gain of after the stage of digital field ride gain, exporting, detect the stage of gain error value;
Obtain the input of above-mentioned gain error value, add up and correct, the stage of the value of gain is corrected in output;
Above-mentioned correction gain on duty with the baseband signal in the above-mentioned stage that is converted to baseband signal, the stage of the baseband signal of gain is corrected in output.
5, method of reseptance as claimed in claim 4 is characterized in that, the stage of above-mentioned detection gain error value comprises:
Obtain the input of above-mentioned restored symbol value, detect the stage of decision symbol improper value;
Obtain the baseband signal of above-mentioned correction gain and the input of automatic gain control criterion performance number, detect the stage of baseband signal gain error value;
In above-mentioned decision symbol improper value and baseband signal gain error value, above-mentioned decision symbol improper value multiply by for judge constant value K1 which mistake should have bigger proportion and tentatively determine, and above-mentioned baseband signal gain error on duty think judge which mistake should have the 1st multiplication stage of the constant value K2 that bigger proportion tentatively determines;
Obtain the above-mentioned K1 order of magnitude section with above-mentioned decision symbol improper value on duty;
The absolute value of above-mentioned decision symbol improper value multiply by above-mentioned K2 the 2nd multiplication stage with above-mentioned baseband signal gain error value on duty;
Above-mentioned K1 is on duty with above-mentioned decision symbol improper value, adds the stage of the output valve in above-mentioned the 2nd multiplication stage.
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