CN202503518U - Fast self-adaptive timeslot AGC device of GSM digital optical fiber frequency-selection repeater - Google Patents
Fast self-adaptive timeslot AGC device of GSM digital optical fiber frequency-selection repeater Download PDFInfo
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- CN202503518U CN202503518U CN2012201289000U CN201220128900U CN202503518U CN 202503518 U CN202503518 U CN 202503518U CN 2012201289000 U CN2012201289000 U CN 2012201289000U CN 201220128900 U CN201220128900 U CN 201220128900U CN 202503518 U CN202503518 U CN 202503518U
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Abstract
The utility model discloses an AGC (automatic gain control) device of a GSM digital optical fiber frequency-selection repeater. The AGC device is characterized in that: it comprises a field-programmable gate array as a core logic processor, a central processing unit as a co-processor, an analog/digital converter (ADC), an RF (radio frequency) digital attenuator, an RF (radio frequency) mixer and a low noise amplifier. The low noise amplifier is connected to the RF mixer that is in connection with the RF digital attenuator. The RF digital attenuator is connected to the analogue/digital converter, which is in connection with the field-programmable gate array connected to the central processing unit. The field-programmable gate array is connected to the RF digital attenuator by a digital attenuator control bus. Compared with the prior art, the utility model of the invention has the following advantages that: the installation and debugging steps by engineering staff are reduced, the whole AGC adjustment period is short, the signal quality is not affected basically, and gain compensation can be performed on a single carrier signal, thus guaranteeing the call quality of subscribers.
Description
Technical field
The utility model relates to the quick self-adapted time slot A GC device of a kind of GSM digital optical fibre frequency-selecting repeater, belongs to the moving communicating field field.
Background technology
Existing GSM digital optical fibre frequency-selecting repeater AGC device comprises attenuator, analog frequency mixing, analog/digital converter, logic processing device.The prior art design is the digital signal level after directly the up ADC transducer of statistics quantizes, and judges that according to the time slot of artificial setting threshold value recovers the upward signal gap information, during time slot signal; The signal level value and the target level value of statistics are made comparisons; According to comparative result, with certain step-length adjusted value, to the adjustment that gains of the attenuator of ADC transducer front end; This is equivalent to a negative feedback closed loop control circuit; Make ADC transducer quantized signal level value convergence target level value through continuous adjustment radiofrequency signal numerical-control attenuator, in the signal slot transition period, the mobile telecommunication channel that the signal gain situation of ADC transducer front end is returned to default value GSM standard is a kind of communication channel of complicacy; It has characteristics such as rapid fading, slow fading, multipath stack; And power control speed is slow, even some base station do not open the power control function, causes the level fluctuation scope of its upward signal big; Make linear amplifier get into saturation condition to get clogged because signal level is too high in order to prevent the direct end uplink signal with ADC converter dynamic range deficiency; Cause conversation loss, influence speech quality etc., therefore need to improve the requirement of the dynamic range performance that direct end uplink is received.
The GSM digital optical fibre frequency-selecting repeater is in order to improve up reception dynamic range now; To GSM standard signal characteristic; Usually use DAGC (Digital Automatic Gain Control to time slot; Digital Auto Gain control), press the power of time slot information adjustment supplied with digital signal, guarantee that ADC transducer quantified precision and anti-stop signal are saturated.Common GSM digital optical fibre frequency-selecting repeater time slot A GC way mainly is the digital signal level after directly the up ADC transducer of statistics quantizes; Judge that according to the time slot of artificial setting threshold value recovers the upward signal gap information; During time slot signal, the signal level value and the target level value of statistics are made comparisons, according to comparative result; With certain step-length adjusted value; To the adjustment that gains of the radiofrequency signal numerical-control attenuator of ADC transducer front end, this is equivalent to a negative feedback closed loop control circuit, makes ADC transducer quantized signal level value convergence target level value through continuous adjustment radiofrequency signal numerical-control attenuator; In the signal slot transition period, the signal gain situation of ADC transducer front end is returned to default value.There is following defective in this mode:
A) increase engineering staff's installation and debugging difficulty for setting the time slot recovery threshold value, obtain relatively difficulty of a proper threshold value.
B) need adjust to the target level value through the signal level that a plurality of adjustment processes could will be imported the ADC transducer, whole adjustment cycle is long, and this carrier wave and other carrier signals are all had certain damage, influences signal quality.
C) between AGC the adjustment period, can decay in the lump, can cause consequences such as small-signal user's communication degradation even call drop like this, and gain compensation can't be carried out to single carrier signal in analog signal repeater and wideband digital repeater the small-signal time slot.
The utility model content
The utility model technical problem to be solved is; Overcome the defective that prior art exists; Provide a kind of and can self adaptation calculate the time slot recovery threshold value; Accurately recover the time slot signal transitional information, improve the signal level of input ADC transducer and adjust to regulating the speed of target level value, and can guarantee the quick self-adapted time slot A GC device of GSM digital optical fibre frequency-selecting repeater of gain balance property of the uplink downlink of small-signal time slot.
The utility model addresses the above problem the technical scheme that is adopted: the quick self-adapted time slot A GC device of this GSM digital optical fibre frequency-selecting repeater; It is characterized in that: comprise core logic processing apparatus FPGA (Field-Programmable Gate Array; Field programmable gate array), coprocessor CPU (Central Processing Unit; Central processing unit), analog/digital converter ADC, RF (Radio Frequency; Radio frequency) numerical-control attenuator, RF frequency mixer and, low noise amplifier LNA (Low Noise Amplifier); Said low noise amplifier LNA (Low Noise Amplifier) connects the RF frequency mixer; Said RF frequency mixer connects the RF numerical-control attenuator, and said RF numerical-control attenuator connects analog/digital converter ADC, and said analog/digital converter ADC connects core logic processing apparatus FPGA; Said core logic processing apparatus FPGA connects coprocessor CPU, and said core logic processing apparatus FPGA connects the RF numerical-control attenuator through the numerical-control attenuator control bus.
The described core logic processing apparatus of the utility model FPGA comprises line level statistical module, unit modular converter, AGC control module, up frequency-selecting filter DDC part of module, carrier gains compensating module, Optical Fiber Transmission protocol module, self-adaptive descending time slot recovery module and time-delay deviation adjusting module; Line level statistical module and up frequency-selecting filter DDC part of module in the said analog/digital converter ADC connection; The said line level statistical module of going up connects the unit modular converter; Said unit modular converter connects the AGC control module; Said AGC control module connects the RF numerical-control attenuator; Said up frequency-selecting filter DDC part of module connects the carrier gains compensating module; The carrier gains compensating module connects the Optical Fiber Transmission protocol module, and said Optical Fiber Transmission protocol module connects self-adaptive descending time slot recovery module, and said self-adaptive descending time slot recovery module connects the time-delay deviation adjusting module; Said time-delay deviation adjusting module connects the AGC control module, and said self-adaptive descending time slot recovery module connects coprocessor CPU.
Self-adaptive descending time slot recovery module is used for calculating automatically the needed judgement threshold value of recovery descending time slot information; The time-delay deviation adjusting module is used for recovering the upward signal gap information through relation of the time delay between the uplink and downlink signals and optical-fiber time-delay value, and last line level statistical module averages power statistic to upward signal.The unit modular converter be used for can be fast with statistics level unit by watt converting decibel into, the carrier gains compensating module is used for the less carrier wave of signal level is carried out gain compensation.
The utility model compared with prior art has the following advantages: self adaptation is calculated the time slot recovery threshold value, has reduced engineering staff's installation and debugging step, and if the base station adjusted down transmitting power, also need not artificial going and revise this threshold value.Whole AGC adjustment cycle is short, does not influence signal quality basically.Can carry out gain compensation to single carrier signal, can guarantee the gain balance property of the uplink downlink of small-signal time slot like this, guarantee the user's communication quality.
Description of drawings
Fig. 1 is the principle schematic of the utility model embodiment A GC device.
Fig. 2 is the utility model embodiment F PGA built-in function block diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described.
Referring to Fig. 1～Fig. 2; The quick self-adapted time slot A GC device of present embodiment GSM digital optical fibre frequency-selecting repeater comprises core logic processing apparatus FPGA, coprocessor CPU, analog/digital converter ADC, RF numerical-control attenuator, RF frequency mixer and low noise amplifier LNA; Said low noise amplifier LNA connects the RF frequency mixer; Said RF frequency mixer connects the RF numerical-control attenuator; Said RF numerical-control attenuator connects analog/digital converter ADC; Said analog/digital converter ADC connects core logic processing apparatus FPGA, and said core logic processing apparatus FPGA connects coprocessor CPU, and said core logic processing apparatus FPGA connects the RF numerical-control attenuator through the numerical-control attenuator control bus.Described core logic processing apparatus FPGA comprises line level statistical module, unit modular converter, AGC control module, up frequency-selecting filter DDC part of module, carrier gains compensating module, Optical Fiber Transmission protocol module, self-adaptive descending time slot recovery module and time-delay deviation adjusting module; Line level statistical module and up frequency-selecting filter DDC part of module in the said analog/digital converter ADC connection; The said line level statistical module of going up connects the unit modular converter; Said unit modular converter connects the AGC control module; Said AGC control module connects the RF numerical-control attenuator; Said up frequency-selecting filter DDC part of module connects the carrier gains compensating module; The carrier gains compensating module connects the Optical Fiber Transmission protocol module, and said Optical Fiber Transmission protocol module connects self-adaptive descending time slot recovery module, and said self-adaptive descending time slot recovery module connects the time-delay deviation adjusting module; Said time-delay deviation adjusting module connects the AGC control module, and said self-adaptive descending time slot recovery module connects coprocessor CPU.The Optical Fiber Transmission protocol module connects light/electric modular converter.
Self-adaptive descending time slot recovery module is used for calculating automatically the needed judgement threshold value of recovery descending time slot information; The time-delay deviation adjusting module is used for recovering the upward signal gap information through relation of the time delay between the uplink and downlink signals and optical-fiber time-delay value, and last line level statistical module averages power statistic to upward signal.The unit modular converter be used for can be fast with statistics level unit by watt converting decibel into, the carrier gains compensating module is used for the less carrier wave of signal level is carried out gain compensation.
Self-adaptive descending time slot recovery module is used for calculating automatically the needed judgement threshold value of recovery descending time slot information; The time-delay deviation adjusting module is used for recovering the upward signal gap information through relation of the time delay between the uplink and downlink signals and optical-fiber time-delay value; The unit modular converter be used for can be fast with statistics level unit by watt converting decibel into, the carrier gains compensating module is used for the less carrier wave of signal level is carried out gain compensation.
The utlity model has self adaptation and calculate time slot recovery threshold value function; Variation according to base station transmitting power can be adjusted threshold value automatically; And do not need artificial going to calculate and revise this value; Speed automatic gain control AGC and small-signal automatic gain compensation can guarantee signal quality not to be damaged simultaneously, have guaranteed user's speech quality.
Though the utility model with embodiment openly as above; But it is not in order to limit the protection range of the utility model; Any technical staff who is familiar with this technology, change and the retouching in design that does not break away from the utility model and scope, done all should belong to the protection range of the utility model.
Claims (2)
1. quick self-adapted time slot A GC device of GSM digital optical fibre frequency-selecting repeater; It is characterized in that: this AGC device comprises core logic processing apparatus, coprocessor, analog/digital converter, RF numerical-control attenuator, RF frequency mixer and low noise amplifier; Said low noise amplifier connects the RF frequency mixer; Said RF frequency mixer connects the RF numerical-control attenuator, and said RF numerical-control attenuator connects analog/digital converter, and said analog/digital converter connects the core logic processing apparatus; Said core logic processing apparatus connects coprocessor, and said core logic processing apparatus connects the RF numerical-control attenuator through the numerical-control attenuator control bus.
2. the quick self-adapted time slot A GC device of GSM digital optical fibre frequency-selecting repeater according to claim 1; It is characterized in that: described core logic processing apparatus comprises line level statistical module, unit modular converter, AGC control module, up frequency-selecting filter DDC part of module, carrier gains compensating module, Optical Fiber Transmission protocol module, self-adaptive descending time slot recovery module and time-delay deviation adjusting module; Said analog/digital converter connects goes up line level statistical module and up frequency-selecting filter DDC part of module; The said line level statistical module of going up connects the unit modular converter; Said unit modular converter connects the AGC control module; Said AGC control module connects the RF numerical-control attenuator, and said up frequency-selecting filter DDC part of module connects the carrier gains compensating module, and the carrier gains compensating module connects the Optical Fiber Transmission protocol module; Said Optical Fiber Transmission protocol module connects self-adaptive descending time slot recovery module; Said self-adaptive descending time slot recovery module connects the time-delay deviation adjusting module, and said time-delay deviation adjusting module connects the AGC control module, and said self-adaptive descending time slot recovery module connects coprocessor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201289000U CN202503518U (en) | 2012-03-30 | 2012-03-30 | Fast self-adaptive timeslot AGC device of GSM digital optical fiber frequency-selection repeater |
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| CN2012201289000U CN202503518U (en) | 2012-03-30 | 2012-03-30 | Fast self-adaptive timeslot AGC device of GSM digital optical fiber frequency-selection repeater |
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| CN202503518U true CN202503518U (en) | 2012-10-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102625435A (en) * | 2012-03-30 | 2012-08-01 | 杭州畅鼎科技有限公司 | Automatic gain control (AGC) device for global system for mobile communication (GSM) digital optical fiber frequency-selecting repeater and quick adaptive time slot method for AGC device |
-
2012
- 2012-03-30 CN CN2012201289000U patent/CN202503518U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102625435A (en) * | 2012-03-30 | 2012-08-01 | 杭州畅鼎科技有限公司 | Automatic gain control (AGC) device for global system for mobile communication (GSM) digital optical fiber frequency-selecting repeater and quick adaptive time slot method for AGC device |
| CN102625435B (en) * | 2012-03-30 | 2014-11-26 | 杭州畅鼎科技有限公司 | Automatic gain control (AGC) device for global system for mobile communication (GSM) digital optical fiber frequency-selecting repeater and quick adaptive time slot method for AGC device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121024 Effective date of abandoning: 20141126 |
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| RGAV | Abandon patent right to avoid regrant |