CN1201566A - Gain controlling method and receiver - Google Patents
Gain controlling method and receiver Download PDFInfo
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- CN1201566A CN1201566A CN 96198056 CN96198056A CN1201566A CN 1201566 A CN1201566 A CN 1201566A CN 96198056 CN96198056 CN 96198056 CN 96198056 A CN96198056 A CN 96198056A CN 1201566 A CN1201566 A CN 1201566A
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Abstract
For a nonperiodical burst signal transmitted from a mobile station in an AGC mode with an unknown transmission power, the AGC is convered in a short time at the beginning of the nonperiodical signal. For a periodical burst signal, transmission power control and interference wave detection are performed according to the presence/absence of the voice signal from the mobile station. These processings are for preventing erroneous control of the AGC and maintaining the communication quality of the radio base station system. In the case of a nonperiodic burst signal, the receiving level is detected at a high speed by only turning on/off an attenuator which has a quick transient response and fixing the gain of the AGC amplifier which has a slow transient response, both being provided as gain control elements. In the case of a periodic burst signal, the erroneous control of AGC is prevented and interferences are detected by utilizing synchronous words contained in the burst signal.
Description
Technical field
The present invention relates to the gain control method and the receiving device of the gain of control input signals.
Background technology
Figure 10 is the structure chart of the circuit structure example of the expression receiver that adopts digital AGC (Automatic Gain Control) mode, is used for illustrating the receiver that uses at radio base station.Among the figure, the 100th, antenna, 200 are to use the receiver of the frequency of RF～IF frequency band, the 210th, variable attenuator, the 220th, AGC amplifier, the 310th, quadrature detector, the 320th, the A/D converter, the 330th, D/A converter, the 340th, the control signal wire of variable attenuator, the 400th, digital signal processor (DSP).
Figure 11 is the flow chart of the algorithm of the existing AGC mode of expression.
The circuit operation of receiver at first is described with Figure 10.
In antenna 100, receive the timesharing multichannel that sends by mobile body terminal (hereinafter to be referred as TDMA; Time Division Multiple Access) RF signal.Receiver 200 falls the signal of conversion frequency to the IF frequency band from the signal of RF frequency band.
The decay control of being undertaken by variable attenuator 210 has the control by several dB steps of the digital control generation of numerical digit, or the on/off control of tens of dB units etc.Here the situation that explanation adopts the on/off of tens of dB units of the latter to control.
On the other hand, AGC amplifier 220 can utilize voltage to carry out gain controlling continuously.
The signal that the IF that exports from receiver 200 is with is transfused to quadrature detector 310.
Be transfused to A/D converter 320 from the I component of quadrature detector 310 outputs and the baseband signal of Q component,, finish for example 4 times mistake sample at rates, to the quantized signal of each sampling output digit corresponding to a symbol of I component or Q component signal.
Be transfused to digital signal processor 400 from the quantized signal of A/D converter 320 outputs, carry out AGC algorithm shown in Figure 9.
Secondly with Figure 11 the AGC algorithm of technology as a setting is described.
After digital signal processor 400 is received this collection of letters beginning markers, by control signal wire 340 and D/A converter 330, in gain control element 210 and 220, set the controlling value relevant that derives by the collection of letters burst signal in this time slot of former frame with collection of letters signal level.So, the ride gain control element is ATT210 and AGC amplifier 220, so that the gain in the same time slot of former frame is identical.Receiver 200 is according to the gain of setting, and receives the burst signal (step 901) in this time slot of this frame.
This time the collection of letters burst signal in this time slot of frame is transformed into the baseband signal of I component and Q component by quadrature detector 310.The baseband signal of these I components and Q component generates for example 4 times oversampling value by A/D converter 320.Be taken into the Y sampling (step 902) that this result obtains by digital signal processor 400, what derivation was carried out this collection of letters burst signal sets corresponding departure (step 903) with gain control element.Here, so-called departure is meant the value of the difference of be equivalent to collect mail level and desirable level, the amplitude that expression is made it to restrain by gain control element.
Secondly, judge whether above-mentioned departure can only follow the tracks of (step 904) by the AGC amplifier.Under situation about only follow the tracks of, during burst signal in this time slot that receives this frame, carry out inching (step 907) with the sizable gain of above-mentioned departure by the AGC amplifier.In addition, under situation about can not only follow the tracks of by the AGC amplifier, during burst signal in this time slot that receives this frame, the coarse adjustment (step 905) that the setting of variable attenuator is reversed.
Determine processing like this, wait for the burst signal (step 906) in this time slot that receives such next frame the burst signal in this time slot of this frame.
As mentioned above, under the situation that adopts existing AGC mode,, the collection of letters burst signal in this time slot of next frame is controlled according to the departure of the collection of letters burst signal in this time slot of a preceding frame.; because the various reasons such as distance between travelling carriage and the radio base station, make that the output of posting a letter of the burst signal calling out or send from travelling carriage during switching channels etc. is indeterminate, in addition; burst signal is not periodically to send in each frame, but acyclic.Therefore, in the radio base station that receives such burst signal, can not utilize former frame, and need by AGC in the burst signal of the frame of being received this time, make collection of letters level converge to desirable value.
On the other hand, even periodic burst signal is being adopted under the situation of existing AGC mode, only become departure owing to carry out information that AGC uses to collection of letters burst signal, and do not have the device of detection the post a letter power control corresponding, so there is the problem of the possibility of the mistake control of carrying out gain controlling with voiceless sound in interference or the travelling carriage.
In addition, no matter whether be periodic/acyclic burst signal, under the situation of collection of letters timing off-set, there is the problem that causes the gain controlling mistake.
Disclosure of an invention
The present invention finishes in order to address the above problem, and its purpose is to provide a kind of gain control method and receiving device that can make the gain convergence in advance.
In order to reach this purpose, according to a viewpoint, provide the gain control method in a kind of receiving device, this receiving device has: according to each first set point, second set point, make the attenuating device of the signal attenuation of input; Amplify the amplifying device of the signal of input according to control signal; And the control device that above-mentioned first set point, above-mentioned second set point and above-mentioned control signal take place, above-mentioned gain control method may further comprise the steps: the collection of letters level of judging the signal imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in determining step; And in above-mentioned determining step, when concluding is in the first departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to first set point, when concluding is in the above-mentioned second departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to above-mentioned second set point, and in above-mentioned amplifying device, amplify the signal of being imported, thereby control the gain controlling step of above-mentioned gain.
Particularly in determining step, when the collection of letters level of the signal of being imported is not included in any one scope that reaches in the above-mentioned first departure scope in the above-mentioned second departure scope, carry out this judgement once more through behind the certain hour.
In addition, according to another viewpoint, provide the gain control method in a kind of receiving device, this receiving device has: according to each first set point, second set point, make the attenuating device of the signal attenuation of input; At least amplify the amplifying device of the signal of input according to control signal by low gain or high-gain; And the control device that above-mentioned first set point, above-mentioned second set point and above-mentioned control signal take place, above-mentioned gain control method may further comprise the steps: the collection of letters level of judging the signal imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in determining step; And in above-mentioned determining step, the collection of letters level of the signal of importing when concluding is in the above-mentioned first departure scope time, according to above-mentioned first set point signal of importing is carried out gain controlling, when concluding is in the above-mentioned second departure scope time, in above-mentioned attenuating device, the signal of importing is carried out gain controlling according to above-mentioned second set point, when the collection of letters level of the signal of being imported is not included in any one scope that reaches in the above-mentioned first departure scope in the above-mentioned second departure scope, control amplifying device, carry out the gain controlling step of gain controlling by high-gain.
Especially will be to above-mentioned first set point of above-mentioned attenuating device as the set point that make this attenuating device conducting, with above-mentioned second set point as the set point that makes this attenuating device disconnection.
In addition, attenuating device has the amplifying device of selecting corresponding to first set point, and second attenuating device of selecting corresponding to second set point.
In addition, according to another viewpoint, provide the gain control method in a kind of receiving device, this receiving device has: according to each first set point, second set point, make first attenuating device of the signal attenuation of input; According to each the 3rd set point, the 4th set point, make second attenuating device of the signal attenuation of input; Amplify first amplifying device of the output signal of above-mentioned first attenuating device according to first control signal; According to amplifying second amplifying device of the output signal of above-mentioned second attenuating device than the second high control signal of above-mentioned first amplifying device gain; And the control device that the above-mentioned first, second, third and the 4th set point and above-mentioned first and second control signal take place, above-mentioned gain control method may further comprise the steps: the collection of letters level of judging the signal imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in, or with the 3rd corresponding departure scope of above-mentioned the 3rd set point in, or with the 4th corresponding departure scope of above-mentioned the 4th set point in determining step; And, make the signal attenuation and the amplification of input according to corresponding to above-mentioned set point and above-mentioned amplifying device in the existing above-mentioned departure scope of collection of letters level of the signal of above-mentioned input, control the gain controlling step of above-mentioned gain.
Particularly in above-mentioned determining step, when the collection of letters level of the signal of being imported is not included in the above-mentioned first departure scope, in the above-mentioned second departure scope, in above-mentioned the 3rd departure scope and in any one scope in above-mentioned the 4th departure scope time, carry out this judgement once more through behind the certain hour.
After above-mentioned gain controlling step, above-mentioned first amplifying device is applied above-mentioned second control signal more in addition, and above-mentioned second amplifying device is applied above-mentioned first control signal again, carry out above-mentioned determining step and above-mentioned gain controlling step.
Each departure scope is set with prescribed limit with overlapping.
In addition, in above-mentioned gain controlling step, carried out after the gain controlling in addition, estimated the evaluation procedure of communications status according to the synchronization character that receives.
In above-mentioned gain controlling step, carried out after the gain controlling in addition, estimated the evaluation procedure of communications status according to the synchronization character that receives; And when detecting the abnormal conditions of communications status in above-mentioned evaluation procedure, restriction detects the collection of letters conditioning step of the collection of letters of the attenuating device of a side of abnormal conditions and amplifying device.
According to another viewpoint, a kind of receiving device is provided, this receiving device has: according to each first set point, second set point, make the attenuating device of the signal attenuation of input; Amplify the amplifying device of the signal of input according to control signal; And the control device that above-mentioned first set point, above-mentioned second set point and above-mentioned control signal take place, above-mentioned control device has: the collection of letters level of judging the signal imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in judgment means; And in above-mentioned judgment means, when concluding is in the above-mentioned first departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to above-mentioned first set point, when concluding is in the above-mentioned second departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to above-mentioned second set point, and in above-mentioned amplifying device, amplify the signal of input, thereby control the gain control of above-mentioned gain.
In addition, according to another viewpoint, provide a kind of receiving device, this receiving device has: the attenuating device that makes the signal attenuation of input according to set point; Amplify the amplifying device of the signal of input according to control signal; And the control device that above-mentioned set point, above-mentioned control signal take place, this receiving device is characterised in that: above-mentioned set point and above-mentioned control signal take place according to the mean value of a plurality of departure values in past in above-mentioned control device.
Particularly do not detect under the situation of the synchronization character that comprises in the signal of input at above-mentioned control device, when the departure that derives by the part beyond the synchronization character when setting is following, predicating is to be handled by the tone-off of calling side to cause, does not comprise this departure in a plurality of departures in the past of asking above-mentioned mean value to use.
In addition, do not detect under the situation of the synchronization character that comprises in the signal of input at above-mentioned control device, when the departure that derives by the part beyond the synchronization character when setting is above, predicating is that the disturbing wave of signal by to input causes, does not comprise this departure in a plurality of departures in the past of asking above-mentioned mean value to use.
The simple declaration of accompanying drawing
Fig. 1 is the structure chart of structure of the receiver of the expression AGC mode that realizes embodiments of the invention 1.
Fig. 2 is the structure chart of structure of the receiver of the expression AGC mode that realizes embodiments of the invention 1.
Fig. 3 is the structure chart of structure of the receiver of the expression AGC mode that realizes embodiments of the invention 2.
Fig. 4 is the structure chart of structure of the receiver of the expression AGC mode that realizes embodiments of the invention 2.
Fig. 5 is the flow chart of algorithm of the AGC mode of expression embodiments of the invention 1.
Fig. 6 is the flow chart of algorithm of the AGC mode of expression embodiments of the invention 2.
Fig. 7 is the flow chart of algorithm of the AGC mode of expression embodiments of the invention 2.
Fig. 8 is the flow chart of algorithm of the AGC mode of expression embodiments of the invention 3.
Fig. 9 is the flow chart of algorithm of the AGC mode of expression embodiments of the invention 3.
Figure 10 is the structure chart of the structure of the expression receiver that adopts the AGC mode relevant with background technology.
Figure 11 is the flow chart of the algorithm of the expression AGC mode relevant with background technology.
The optimal morphology of the usefulness that carries out an invention
Secondly, by following embodiment the present invention is described.
Below utilize description of drawings embodiment 1.Fig. 1 is the structure chart of one of structure example of the receiver of the expression AGC mode that realizes embodiment 1, represents the receiver that has in the radio base station especially.Among the figure, the 100th, receive and dispatch antenna from the signal of a plurality of travelling carriages, the 200th, with the receiver that antenna 100 is connected, the frequency of its processing RF～IF frequency band.
210 be provided in a side of in the receiver 200, make the variable attenuator of the signal attenuation that receives by antenna 100.
220 be provided in a side of in the receiver 200, amplify AGC amplifier by the signal of variable attenuator 210 outputs.The 310th, the signal from receiver 200 output is carried out the quadrature detector of orthogonal detection, the 320th, be the A/D converter that analog signal is transformed into digital signal with the output signal of quadrature detector 310, the 400th, the digital signal processor (DSP) of the digital signal of A/D conversion has been carried out in input in A/D converter 320.
The 330th, the control signal to AGC amplifier 220 from DSP400 output is transformed into the D/A converter of analog signal, the 340th, from the control signal wire to variable attenuator 210 of DSP400 output.
The 500th, the base station host CPU that carries out the access of signal with DSP400.Base station host CPU 500 receives the detection of synchronization characters/do not detect the report of information and interference wave collection of letters information from digital signal processor 400, carries out fault management, the communication quality management of the receiver before the digital signal processor 400.
In addition, Fig. 5 is the flow chart of algorithm of the AGC mode of expression embodiment 1.
Next utilizes structure example among Fig. 1 and the flow chart among Fig. 5, and the AGC mode relevant with this embodiment 1 is described.
After digital signal processor 400 is received this collection of letters beginning markers, by control signal wire 340 and D/A converter 330, to gain control element be during variable attenuator 210 and AGC amplifier 220 carry out collection of letters level detection set (following in the explanation of embodiment 1, be called for short P2; Middle collection of letters level detection is set) (step 601).Here, collection of letters level detection setting P2 is meant variable attenuator 210 is disconnected setting in this, and the AGC amplifier is set at low gain.Under this state, the burst signal that receives by antenna 100 is transfused to receiver 200, exports according to P2.At this moment, the signal that is input in the variable attenuator 210 unattenuatedly directly is output.Be transformed into the baseband signal of I component and Q component by quadrature detector 310 from the signal of receiver 200 outputs.The baseband signal of these I components and Q component is carried out the doubly mistake sample at rates of (for example 4 times) of M in A/D converter 320.Digital signal processor 400 is according to the beginning markers of collecting mail in addition, is taken into K symbol (for example 2 symbols) * M sampling from the beginning of burst signal.The information that digital signal processor 400 bases are taken into, the departure (step 602) of the AGC amplifier when calculating P2.After being set at PS between K the symbol from burst signal beginning, then (followingly in the explanation of embodiment 1, be called for short P3 to carrying out high collection of letters level detection setting between K the symbol; High collection of letters level detection is set).Then, be set under the situation of this P3, also will calculating the departure (step 603) of AGC amplifier.Here, this P3 is meant variable attenuator 210 is set at connection, the AGC amplifier is set at low gain.
The departure monitoring range of the AGC amplifier during this P3 is compared during with P2, because variable attenuator 210 is set to connection, institute thinks the different scope of part (for example 40dB) that is only decayed by variable attenuator 210.
Departure when departure in the time of so just deriving P2 and P3.
Through after the above work, whether the collection of letters level of judging collection of letters burst signal is present in the scope interior (step 604) that the departure of P2 or P3 some AGC amplifiers among both monitors.
Under the situation in collection of letters level is present in the departure monitoring range of P2 or P3, carry out the setting of variable attenuator 210, make it to become a side's who exists with collection of letters level the corresponding setting of departure monitoring range, and the size of the departure of the AGC amplifier of in this is set, deriving according to elder generation, control once more, so that compensate this departure (step 611).For example, when concluding that collection of letters level is present in the departure monitoring range of P2, variable attenuator 210 is disconnected, making the AGC amplifier is low gain.
In step 611, after DSP400 controls once more, continue the received pulse string signal, detect the synchronization character that comprises in the burst signal that is received.DSP400 will represent that the synchronization character that whether detects synchronization character detect/does not detect report information to base station host CPU (step 612).The base station host CPU detect/does not detect information according to this synchronization character, the fault detect and the communication quality (step 613) of management receiver.For example, do not detecting under the situation of synchronization character, judging whether receiver has fault or deny the communication quality deterioration.
Under the situation in collection of letters level is not present in the departure scope of P2 or P3, then with the J symbol as non-processor.。
As the reasons are as follows of such processing: in collection of letters sequential under the situation from the signal of travelling carriage received is moved, promptly lagged behind than desirable collection of letters sequential to+lateral deviation, in step 602 and step 603, in the sequential that derives departure, can not receive the possibility of signal in addition.At this moment, though also do not receive signal, in this time,, derive departure and conclude that mistakenly collection of letters level is low relevant for the signal of collection of letters level with original regulation.Therefore, in this embodiment, suppose collection of letters timing off-set, in the time that can compensate this skew, the mensuration of the level of collecting mail once more.
For example, under the situation of K=2, consider that collection of letters timing off-set reaches+5 symbols, thus need 4 symbols (K * 2) when deriving each departure of P2, P3, institute so that J=1 (5-4) get final product.
Only after J symbol is as non-processor, then receive K symbol with P2 again, derive the departure (step 605) of AGC amplifier by digital signal processor 400.
In addition, after this receive K symbol with P3 again, derive the departure (step 606) of AGC amplifier by digital signal processor 400.
Judge from step 605 and step 606 whether the collection of letters level of collection of letters burst signal is present in the departure monitoring range of AGC amplifier of P2 or P3 (step 607).
Under the situation in collection of letters level is present in the departure monitoring range of P2 or P3, the setting of the variable attenuator 210 by carrying out a certain selected side, and the departure part to first AGC amplifier of deriving is controlled again in this setting, makes collection of letters level convergence (step 614).
Whether be present in work in the departure monitoring range of regulation owing in step 605,606,607, carried out repeatedly deriving collection of letters level like this, even so at collection of letters timing off-set situation under, can identification error and can correctly derive collection of letters level yet.
The collection of letters burst signal that DSP400 receives the back of control again in step 614 carries out synchronization character and detects.DSP400 detects report information with synchronization character and gives base station host CPU (step 615).The base station host CPU detects information according to this synchronization character, the fault detect and the communication quality (step 616) of management receiver.
Under the situation in collection of letters level is not present in the departure monitoring range of P2 or P3, be that variable attenuator 210 is set at disconnection, the low collection of letters level that AGC amplifier 220 is set at high-gain set (followingly in the explanation of embodiment 1, be called for short P1; Low collection of letters level is set) (step 608).
Again will be through then the synchronization character of this collection of letters burst signal of reception detection report information is to base station host CPU (step 609) behind the P1, the base station host CPU is managed the fault detect and the communication quality (step 610) of receiver according to this information.
According to above explanation, if effectively utilize the processing of the on/off of the fast variable attenuator of the transient response shown in the flow process among Fig. 5, then can the shortest AGC controlling value determine transient response time (tens of microseconds of time+gain control element with K * 2 symbol; 2～4 symbols) few like this symbolic number makes the AGC convergence.
In addition, even for the situation of generation+side collection of letters timing off-set or the situation of low collection of letters incoming level, also may make the AGC convergence with above-mentioned time+J symbol+K * 2 few like this symbolic numbers of symbol.Promptly, under the situation of first burst signal that receives acyclic burst signal not clear or periodic burst signal from the output of posting a letter of travelling carriage, can realize particularly and can make the AGC convergence with several symbols, then not lose the AGC that the pulse train of usefulness of the amplitude information ground of this burst signal collecting mail is closed from the beginning of burst signal.
Fig. 2 is the structure chart of second example of structure of the receiver of the expression AGC mode that realizes embodiment 1, among the figure, and the 230th, fixed gain amplifier, the 250, the 260th, the switch that several nanoseconds transient response is fast.
For the structure of receiver shown in Figure 2, also be to control basically according to flow process shown in Figure 5.But P1, P2, P3 utilize switch 250 and switch 260, carry out following setting respectively.
P1: selective amplifier 230 is set at high-gain with the AGC amplifier.
P2: selective amplifier 230 is set at low gain with the AGC amplifier.
P3: select attenuator 240, the AGC amplifier is set at low gain.
Receiver shown in Figure 2 also has the effect same with receiver shown in Figure 1.
Fig. 3 is the structure chart of the receiver of this embodiment 2 of expression.
In Fig. 3,101 is antennas of first system, 210 is variable attenuators of first system, 220 is AGC amplifiers of first system, 310 is quadrature detectors of first system, 320 is A/D converters of first system, and 330 is D/A converters of first system, the 340th, and to the control signal wire of the variable attenuator of first system.100 is antennas of second system, 211 is variable attenuators of second system, 221 is AGC amplifiers of second system, 311 is quadrature detectors of second system, 321 is A/D converters of second system, 331 is D/A converters of second system, the 341st, and to the control signal wire of the variable attenuator of second system.
Fig. 6 and Fig. 7 are the flow charts of algorithm of the AGC mode of expression embodiment 2.This embodiment 2 is a kind of like this AGC modes, promptly, setting the AGC amplifier for first system is different fixing low gain/high-gains with second system, corresponding, two kinds of collection of letters level detection that can will be formed by the on/off of variable attenuator in each system are set four kinds of collection of letters level altogether for.
Secondly, with structure example among Fig. 3 and the flow process among Fig. 6 and Fig. 7, the working condition of the receiver of this embodiment 2 is described.
After digital signal processor 400 is received this collection of letters beginning markers, by control signal wire 340,341 and D/A converter 330,331, to gain control element is that variable attenuator 210,211 and AGC amplifier 220,221 carry out the low collection of letters level detection setting of first system 1, second system high collection of letters level detection setting 1 (following in the explanation of embodiment 2, as to be called for short P1, P3 respectively) (step 701).
That is, be P1 with receiver first default, be P3 with receiver second default.Here, P1 is meant variable attenuator 210 disconnected setting, and AGC amplifier 220 is set at high-gain, and P3 is meant variable attenuator 211 is disconnected setting, and AGC amplifier 221 is set at low gain.
Be transfused to quadrature detector 310 from the signal of receiver 200 outputs, the signal of exporting from receiver 201 is transfused to quadrature detector 311.In quadrature detector 310,311, each input signal is transformed into the baseband signal of I component and Q component.The output signal of 320,321 pairs of each quadrature detectors 310,311 of A/D converter is carried out the doubly mistake sample at rates of (for example 4 times) of M.
The departure of the AGC amplifier when digital signal processor 400 is derived by the first default P1, in addition, the departure (step 702) of the AGC amplifier when deriving by the second default P3.
Then between K symbol, with first system as low collection of letters level detection setting 2 (following in the explanation of embodiment 2, be called for short P2), with second system as height collection of letters level detection setting 4 (following in the explanation of embodiment 2, be called for short P4).Here, P2 is set at connection with variable attenuator 210, and AGC amplifier 220 is set at the setting of high-gain, and P4 is set at connection with variable attenuator 211, AGC amplifier 221 is set at the setting of low gain.
The departure (step 703) of the AGC amplifier when digital signal processor 400 calculates P2 and P4.
Through after the above work, judge whether the collection of letters level of collection of letters burst signal is present in the departure monitoring range interior (step 704) of some AGC amplifiers of P2, P3 and P4.
Under the situation in collection of letters level is present in some departure monitoring ranges of P2, P3 and P4, the setting of the variable attenuator 210 by carrying out first system and the variable attenuator 211 of second system, so that become and the corresponding setting of the existing departure monitoring range of collection of letters level, and the departure part to first AGC amplifier of deriving is controlled by the AGC amplifier 220 of first system and the AGC amplifier 221 of second system again in this setting, makes its convergence (step 711).
In addition, when receiving the next pulse string signal, switch in the collection of letters level detection setting (step 712) that the collection of letters level detection of carrying out in first system is set and carried out in second system.
By such switching, can prevent that first system or a certain side of second system from causing error of performance when breaking down.
DSP400 to the control again in step 711 after, continue the received pulse string signal, and the detection of the synchronization character that is comprised in the burst signal that carries out being received.DSP400 will represent that the synchronization character that whether detects synchronization character detects report information to base station host CPU (step 713).The base station host CPU detects information according to this synchronization character, the fault detect and the communication quality of management receiver.For example, do not detecting under the situation of synchronization character, judging whether receiver has whether deterioration of fault or communication quality.
Under the situation in collection of letters level is not present in any one departure monitoring range of P2, P3 and P4, continue the J symbol as non-processor.Identical as the reason of such processing with reason in embodiment 1 as same processing.
For example, under the situation of K=2, consider that collection of letters timing off-set reaches+5 symbols, thus need 4 symbols (K * 2) when deriving each departure of P2, P3, institute so that J=1 (5-4) get final product.
Only after J symbol is as non-processor, then in first system, K symbol is set at P1 again, in second system, K symbol is set at P3 in addition, and collects mail, derive the departure (step 705) of AGC amplifier by digital signal processor 400.In addition, in first system, K symbol after this is set at P2, in second system, is set at P4, and collects mail, derive the departure (step 706) of AGC amplifier by digital signal processor 400.
In step 705 and step 706, selecting departure from the departure of P2, P3 and P4 is minimum setting.But when concluding that any one does not exist, select P1 (step 707).
The variable attenuator 210 of first system and the variable attenuator 211 of second system are carried out the setting of the variable attenuator in the selected setting, and in this is set, by partly controlling again, make collection of letters level convergence (step 708) by the departure of 221 pairs of AGC amplifiers of deriving earlier of AGC amplifier of the AGC amplifier 220 of first system and second system.
When receiving the next pulse string signal, switch in the collection of letters level detection setting (step 709) that the collection of letters level detection of carrying out in first system is set and carried out in second system.By the setting of such switching first system and second system, when breaking down, any one system can both prevent to work mistakenly.
Because in step 705,706,707, so repeatedly derive the work that in the departure monitoring range of stipulating, whether has collection of letters level, so even during collection of letters timing off-set, can identification error and can correctly derive collection of letters level yet.
The collection of letters burst signal that DSP400 receives the back of control again in step 614 carries out synchronization character and detects.DSP400 detects report information with synchronization character and gives base station host CPU (step 710).Base station host CPU 500 detects information according to this synchronization character, the fault detect and the communication quality of management receiver.
The host CPU 500 of base station carries out the fault detect and the communication quality management of receiver according to following order.
According to the testing result of the synchronization character that in step 713 or step 710, obtains, count the undetected number of times (step 714) of the synchronization character in each system.Its result judges whether do not detecting synchronization character (step 715) A time continuously in the system arbitrarily.
Not detecting for A time under the situation of synchronization character continuously in the system arbitrarily, fault has appearred as this receiver system using, and 500 pairs of digital signal processors 400 of the host CPU of base station are emitted in the order of collecting mail in the trouble-free receiver system using.At this moment, as the example of explanation in embodiment 1, become only with the single receiver system using collection of letters (step 716).
All detecting for A time continuously under the situation of synchronization character in the system arbitrarily, the host CPU 500 of base station is waited for the test results report of being sent by digital signal processor 400 of synchronization character next time (step 717).
In addition, P1 and P2, P2 and P3 and P3 and P4 are respectively that adjacent collection of letters level detection is set, desirable collection of letters incoming level for each setting, make each+side p decibel (for example 10 decibels) ,-monitoring range of the departure of side q decibel (for example 20 decibels) overlaps, therefore can absorb the variation of the uncorrelated collection of letters level that the antenna 101 of antenna 100 from first system, second system receives, the setting of variable attenuator of selection in a system, derivation and the controlling value of AGC amplifier are applicable in another system.
In addition, the level detection of collecting mail like this is set at a plurality of, compares with the AGC mode that realizes with the agc circuit system of first system, even adopt the attenuation of variable attenuator and the identical person of dynamic range of AGC amplifier, also can enlarge the dynamic range as AGC.
According to above explanation, utilize the agc circuit system of two systems shown in the flow process among Fig. 6 and Fig. 7, when the on/off that effectively utilizes the fast variable attenuator of the response of transient state is handled, also can the shortest AGC controlling value determine response time (tens of microseconds of the transient state of time+gain control element with K * 2 symbol; 2～4 symbols) few like this symbolic number makes the AGC convergence.In addition, even for the situation of generation+side collection of letters timing off-set or the situation of low collection of letters incoming level, also may be with the time chien shih AGC convergence of above-mentioned time+J symbol+K * 2 symbols.Particularly under the situation of first burst signal that receives acyclic burst signal not clear or periodic burst signal from the output of posting a letter of travelling carriage, can realize that several symbols of beginning with burst signal make the AGC convergence, then not lose the AGC that the pulse train of usefulness of the amplitude information ground of this burst signal collecting mail is closed.
Fig. 4 is another illustration of the receiver structure of expression embodiment 2.
In Fig. 4,231 is fixed gain amplifiers of second system, and 241 is attenuators of the fixed attenuation amount of second system, and 251,261 is switches of second system, the 351st, and the control signal wire corresponding with the switch of second system.The structure of receiver shown in Figure 4 also is to control according to flow process shown in Figure 6 basically.
But P1, P2, P3, P4 utilize switch 250, switch 251, switch 260, switch 261, carry out following setting respectively.
P1: selective amplifier 230 is set at high-gain with the AGC amplifier.
P2: select attenuator 240, the AGC amplifier is set at high-gain.
P3: selective amplifier 231 is set at low gain with the AGC amplifier.
P4: select attenuator 241, the AGC amplifier is set at low gain.
Receiver shown in Figure 4 also has the effect same with receiver shown in Figure 3.
Embodiment 3
Below, utilize description of drawings embodiment 3.Fig. 8 and Fig. 9 are the flow charts of algorithm of AGC mode of the periodic burst signal of expression embodiment 3, and the circuit structure of realizing this flow process also can be any one of Fig. 1～shown in Figure 4.
Working condition is described.
At first, carry out the initialization (step 800) that detection/detection is counted and disturbing wave is collected mail and counted of synchronization character by the base station host CPU.Digital signal processor 400 receives collection of letters markers.Digital signal processor 400 will be used for the burst signal of reception this time according to the variable attenuator of the preceding burst signal derivation that once receives and the controlling value of AGC amplifier again, begin collect mail (step 801).
Secondly, digital signal processor 400 judges whether to detect synchronization character (step 802).
Detecting under the situation of synchronization character, synchronization character is being detected report information give base station host CPU (step 803).
Calculate then this burst signal and N time before frame in the moving average to the departure of the collection of letters burst signal in the groove of distributing.
The moving average of this calculating is taken care of (step 804) as the controlling value to the gain control element of the collection of letters burst signal in this holding tank of next frame, wait for the next beginning markers of collecting mail.But, with the lower limit-upper limit of departure monitoring range as boundary, in case make the controlling value set at this below boundary.
In addition, the departure that the reception of each burst signal is calculated can be the departure that derives of the part according to the synchronization character in the burst signal and the departure that derives according to the part beyond the synchronization character any one among both.
In addition, consider+side and-skew of the collection of letters sequential of side, above-mentioned two kinds of departures also can be calculated from the derivation of the departure of the symbolic number that is equivalent to timing off-set and remove.By such processing,, also can prevent to control mistake even when the skew of collection of letters sequential takes place.
Do not detecting under the situation of synchronization character, DSP400 will represent not detect the report information of synchronization character to base station host CPU 500 (step 805).Secondly judge the departure that derives by the part beyond the synchronization character whether setting for example-more than the Z decibel (step 806).
Under the situation of the departure that derives by the part beyond the synchronization character less than-Z decibel, owing in travelling carriage, carried out the BOX processing, so it is low to predicate departure, the controlling value of gain control element of burst signal that then will be used for this holding tank of this frame is directly preserved (step 807) as the controlling value of collection of letters burst signal of this holding tank that is used for this frame.
Here, so-called BOX handles and is meant in travelling carriage the processing that during sound import not the power of posting a letter is descended.
By carrying out such control, under the situation that BOX handles, the collection of letters level when hanging down owing to the power itself of posting a letter according to travelling carriage does not carry out the setting of gain control element, so can prevent to control mistake.
Under the situation of the departure that derives by the part beyond the synchronization character greater than-Z decibel, predicate and received disturbing wave, disturbing wave is received report information give base station host CPU 500 (step 808).
The controlling value of gain control element that will be used for this holding tank of this frame is more directly preserved (step 809) as the controlling value of collection of letters burst signal of this holding tank that is used for this frame.By carrying out such control, receiving under the situation of disturbing wave that the collection of letters level when hanging down owing to the power itself of posting a letter according to travelling carriage does not carry out the setting of gain control element, so can prevent to control mistake.
Base station host CPU 500 carries out the increase (renewal) of disturbing wave count pick up and judges (step 810).Then, under situation about not increasing, wait for that disturbing wave receives report (step 811) next time.
On the other hand, under the situation that the disturbing wave count pick up has increased, derivation receives number of times/pulse train according to disturbing wave and measures the disturbing wave acceptance rate (step 812) that number of times (synchronization character detects number of times+do not detect number of times) calculates, and judges that the disturbing wave acceptance rate is whether above percentage X (step 813) arbitrarily.Do not surpassing under the situation of percentage X, the base station host CPU waits for that disturbing wave receives report (step 814) next time.Under the situation that has surpassed percentage X, base station host CPU and other communication quality measurement result are as one man with one of its judgement of using as requirement execution hands off in the unit of upper level base station controller management be used (step 815).
As mentioned above, if adopt gain control method of the present invention, then because it is a gain control method in a kind of like this receiving device, promptly this receiving device has: according to each first set point, second set point, make the attenuating device of the signal attenuation of input; Amplify the amplifying device of the signal of input according to control signal; And the control device that first set point, second set point and above-mentioned control signal take place because above-mentioned gain control method may further comprise the steps: the collection of letters level of judging the signal of being imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in determining step; And in above-mentioned determining step, when concluding is in the above-mentioned first departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to above-mentioned first set point, when concluding is in the above-mentioned second departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to above-mentioned second set point, and in above-mentioned amplifying device, control the gain controlling step of above-mentioned gain by the signal that amplifies input, so can utilize set point to attenuating device, judge whether in departure therefore have the effect that can make the gain convergence in advance.
Particularly in determining step, because the collection of letters level of working as the signal of being imported is in the above-mentioned first departure scope and in any one scope in the above-mentioned second departure scope time, carry out this judgement once more through behind the certain hour, so particularly under the situation of collection of letters timing off-set, can compensate this collection of letters timing off-set and work, so can prevent error of performance.
In addition, if adopt gain control method of the present invention, then because it is a gain control method in a kind of like this receiving device, promptly this receiving device has: according to each first set point, second set point, make the attenuating device of the signal attenuation of input; At least amplify the amplifying device of the signal of input with low gain or high-gain according to control signal; And the control device that first set point, second set point and above-mentioned control signal take place because above-mentioned gain control method may further comprise the steps: the collection of letters level of judging the signal of being imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in determining step; And in above-mentioned determining step, when concluding is in the above-mentioned first departure scope time, according to above-mentioned first set point signal of importing is carried out gain controlling, when concluding is in the above-mentioned second departure scope time, according to above-mentioned second set point signal of importing is carried out gain controlling, at the collection of letters level of the signal of being imported in the above-mentioned first departure scope and under the situation in any one scope in the above-mentioned second departure scope, the control amplifying device, utilize high-gain to come the gain controlling step of ride gain, so can make the gain convergence in advance.
Particularly will be to above-mentioned first set point of above-mentioned attenuating device as the set point that this attenuating device is connected, with above-mentioned second set point as set point, so can easily control with this attenuating device disconnection.
In addition, gain control method of the present invention is a kind of like this gain control method of receiving device, and this receiving device has: according to each first set point, second set point, make first attenuating device of the signal attenuation of input; According to each the 3rd set point, the 4th set point, make second attenuating device of the signal attenuation of input; Amplify first amplifying device of the output signal of above-mentioned first attenuating device according to first control signal; According to amplifying second amplifying device of the output signal of above-mentioned second attenuating device than the second high control signal of above-mentioned first amplifying device gain; And the control device that the above-mentioned first, second, third and the 4th set point and above-mentioned first and second control signal take place because above-mentioned gain control method may further comprise the steps: the collection of letters level of judging the signal of being imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in, or with the 3rd corresponding departure scope of above-mentioned the 3rd set point in, or with the 4th corresponding departure scope of above-mentioned the 4th set point in determining step; And according to corresponding to above-mentioned set point and above-mentioned amplifying device in the existing above-mentioned departure scope of collection of letters level of the signal of above-mentioned input, make the signal attenuation and the amplification of input, control the gain controlling step of above-mentioned gain, so can make the gain convergence in advance, can enlarge gain control range (dynamic range) simultaneously.
Particularly in determining step, when the collection of letters level of the signal of being imported is not included in the above-mentioned first departure scope, in the above-mentioned second departure scope, in above-mentioned the 3rd departure scope and in any one scope in above-mentioned the 4th departure scope time, carry out this judgement once more through behind the certain hour, so particularly under the situation of collection of letters timing off-set, can compensate this collection of letters timing off-set and work, so can prevent error of performance.
Owing to after above-mentioned gain controlling step, first amplifying device is increased by second control signal again, and second amplifying device is increased by first control signal again, carry out determining step and gain controlling step, so can prevent error of performance.Because each departure scope is set with prescribed limit with overlapping, can absorb the variation of irrelevant collection of letters level.In the gain controlling step, carried out after the gain controlling, because the evaluation procedure of the synchronization character evaluation communications status of with good grounds reception also, so can manage the fault and the speech quality of receiver.In the gain controlling step, carried out after the gain controlling, because the synchronization character of with good grounds reception is estimated the evaluation procedure of communications status; And when in above-mentioned evaluation procedure, detecting the abnormal conditions of communications status, restriction detects the conditioning step of the collection of letters of the collection of letters of the attenuating device of a side of abnormal conditions and amplifying device, so can prevent error of performance when any part of receiver system using produces fault.Receiving device of the present invention has: according to each first set point, second set point, make the attenuating device of the signal attenuation of input; Amplify the amplifying device of the signal of input according to control signal; And the control device that first set point, second set point and control signal take place, control device has: the collection of letters level of judging the signal imported be in the first departure scope corresponding with first set point, or with the second corresponding departure scope of second set point in judgment means; And in above-mentioned judgment means, when concluding is in the first departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to first set point, when concluding is in the second departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to second set point, and in amplifying device, amplify the signal of input, thus the control device of ride gain, so can make the gain convergence in advance.
In addition, receiving device of the present invention has: the attenuating device that makes the signal attenuation of input according to set point; Amplify the amplifying device of the signal of input according to control signal; And the control device that above-mentioned set point, above-mentioned control signal take place, above-mentioned set point and above-mentioned control signal take place according to the mean value of a plurality of departure values in past in above-mentioned control device, so set point and control signal can take place exactly.
Particularly do not detect under the situation of the synchronization character that comprises in the signal of input at above-mentioned control device, when the departure that derives by the part beyond the synchronization character when setting is following, predicate is to be handled by the tone-off of calling side to cause, in a plurality of departures in the past of asking above-mentioned mean value to use, do not comprise this departure, do not have the error of performance that produces when words are handled so can prevent calling side.
In addition, do not detect under the situation of the synchronization character that comprises in the signal of input at control device, when the departure that derives by the part beyond the synchronization character when setting is above, predicate is that the disturbing wave of signal by to input causes, in a plurality of departures in the past of asking above-mentioned mean value to use, do not comprise this departure, so can prevent the error of performance that disturbing wave causes.
The possibility of industrial application
As mentioned above, gain control method of the present invention and receiving device for example are applicable to and a plurality of movements The radio base station that platform communicates.
Claims (15)
1. the gain control method in the receiving device, this receiving device has: according to each first set point, second set point, make the attenuating device of the signal attenuation of input; Amplify the amplifying device of the signal of input according to control signal; And the control device that above-mentioned first set point, above-mentioned second set point and above-mentioned control signal take place, above-mentioned gain control method is characterised in that and may further comprise the steps: the collection of letters level of judging the signal imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in determining step; And in above-mentioned determining step, when concluding is in the first departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to first set point, when concluding is in the above-mentioned second departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to above-mentioned second set point, and in above-mentioned amplifying device, amplify the signal of being imported, thereby control the gain controlling step of above-mentioned gain.
2. gain control method according to claim 1, it is characterized in that: in above-mentioned determining step, when the collection of letters level of the signal of being imported is not included in any one scope that reaches in the above-mentioned first departure scope in the above-mentioned second departure scope, carry out this judgement once more through behind the certain hour.
3. the gain control method in the receiving device, this receiving device has: according to each first set point, second set point, make the attenuating device of the signal attenuation of input; At least amplify the amplifying device of the signal of input by low gain or high-gain according to control signal; And the control device that above-mentioned first set point, above-mentioned second set point and above-mentioned control signal take place, above-mentioned gain control method is characterised in that and may further comprise the steps: the condition that above-mentioned amplifying device is set at low gain judge the collection of letters level of the signal imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in determining step; And in above-mentioned determining step, the collection of letters level of the signal of importing when concluding is in the above-mentioned first departure scope time, the signal of input is decayed according to above-mentioned first set point with above-mentioned attenuating device, when concluding is in the above-mentioned second departure scope time, the signal of input is decayed according to above-mentioned second set point with above-mentioned attenuating device, when the collection of letters level of the signal of being imported is not included in any one scope that reaches in the above-mentioned first departure scope in the above-mentioned second departure scope, described amplifying device is set at the gain controlling step that high-gain is carried out gain controlling.
4. according to claim 1 or 3 described gain control methods, it is characterized in that: will be to above-mentioned first set point of above-mentioned attenuating device as the set point that make this attenuating device conducting, with above-mentioned second set point as the set point that makes this attenuating device disconnection.
5. according to claim 1 or 3 described gain control methods, it is characterized in that: above-mentioned attenuating device has the amplifying device of selecting corresponding to first set point, and the attenuating device of selecting corresponding to second set point.
6. the gain control method in the receiving device, this receiving device has: according to each first set point, second set point, make first attenuating device of the signal attenuation of input; According to each the 3rd set point, the 4th set point, make second attenuating device of the signal attenuation of input; Amplify first amplifying device of the output signal of above-mentioned first attenuating device according to first control signal; According to amplifying second amplifying device of the output signal of above-mentioned second attenuating device than the second high control signal of above-mentioned first amplifying device gain; And the control device that the above-mentioned first, second, third and the 4th set point and above-mentioned first and second control signal take place, above-mentioned gain control method is characterised in that and may further comprise the steps: the collection of letters level of judging the signal imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in, or with the 3rd corresponding departure scope of above-mentioned the 3rd set point in, or with the 4th corresponding departure scope of above-mentioned the 4th set point in determining step; And, make the signal attenuation and the amplification of input according to corresponding to above-mentioned set point and above-mentioned amplifying device in the existing above-mentioned departure scope of collection of letters level of the signal of above-mentioned input, control the gain controlling step of above-mentioned gain.
7. gain control method according to claim 6, it is characterized in that: in above-mentioned determining step, when the collection of letters level of the signal of being imported is not included in the above-mentioned first departure scope, in the above-mentioned second departure scope, in above-mentioned the 3rd departure scope and in any one scope in above-mentioned the 4th departure scope time, carry out this judgement once more through behind the certain hour.
8. gain control method according to claim 6, it is characterized in that: after above-mentioned gain controlling step, above-mentioned first amplifying device is increased above-mentioned second control signal again, and above-mentioned second amplifying device increased above-mentioned first control signal again, carry out above-mentioned determining step and above-mentioned gain controlling step.
9. according to claim 1,3 or 6 described gain control methods, it is characterized in that: each departure scope is set with prescribed limit with overlapping.
10. according to claim 1,3 or 6 described gain control methods, it is characterized in that: carried out after the gain controlling in above-mentioned gain controlling step, also the synchronization character of with good grounds reception is estimated the evaluation procedure of communications status.
11. gain control method according to claim 6 is characterized in that: carried out after the gain controlling in above-mentioned gain controlling step, also the synchronization character of with good grounds reception is estimated the evaluation procedure of communications status; And when detecting the abnormal conditions of communications status in above-mentioned evaluation procedure, restriction detects the collection of letters conditioning step of the collection of letters of the attenuating device of a side of abnormal conditions and amplifying device.
12. a receiving device is characterized in that having: according to each first set point, second set point, make the attenuating device of the signal attenuation of input; Amplify the amplifying device of the signal of input according to control signal; And the control device that above-mentioned first set point, above-mentioned second set point and above-mentioned control signal take place, above-mentioned control device has: the collection of letters level of judging the signal imported be in the first departure scope corresponding with above-mentioned first set point, or with the second corresponding departure scope of above-mentioned second set point in judgment means; And in above-mentioned judgment means, when concluding is in the above-mentioned first departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to above-mentioned first set point, when concluding is in the above-mentioned second departure scope time, in above-mentioned attenuating device, make the signal attenuation of input according to above-mentioned second set point, and in above-mentioned amplifying device, amplify the signal of input, thereby control the gain control of above-mentioned gain.
13. receiving device according to claim 12 is characterized in that: above-mentioned set point and above-mentioned control signal take place according to the mean value of a plurality of departure values in past in above-mentioned control device.
14. receiving device according to claim 13, it is characterized in that: do not detect under the situation of the synchronization character that comprises in the signal of input at above-mentioned control device, when the departure that derives by the part beyond the synchronization character when setting is following, predicating is to be handled by the tone-off of calling side to cause, does not comprise this departure in a plurality of departures in the past of asking above-mentioned mean value to use.
15. receiving device according to claim 13, it is characterized in that: do not detect under the situation of the synchronization character that comprises in the signal of input at above-mentioned control device, when the departure that derives by the part beyond the synchronization character when setting is above, predicating is that the disturbing wave of signal by to input causes, does not comprise this departure in a plurality of departures in the past of asking above-mentioned mean value to use.
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| CN 96198056 CN1201566A (en) | 1996-09-05 | 1996-09-05 | Gain controlling method and receiver |
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| CN 96198056 CN1201566A (en) | 1996-09-05 | 1996-09-05 | Gain controlling method and receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100512070C (en) * | 2001-06-25 | 2009-07-08 | 索尼公司 | Automatic gain control circuit and method thereof, and demodulation apparatus using the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100512070C (en) * | 2001-06-25 | 2009-07-08 | 索尼公司 | Automatic gain control circuit and method thereof, and demodulation apparatus using the same |
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