CN204465882U - Automatic gain control equipment under a kind of time division multiplexing - Google Patents
Automatic gain control equipment under a kind of time division multiplexing Download PDFInfo
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- CN204465882U CN204465882U CN201520190920.4U CN201520190920U CN204465882U CN 204465882 U CN204465882 U CN 204465882U CN 201520190920 U CN201520190920 U CN 201520190920U CN 204465882 U CN204465882 U CN 204465882U
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Abstract
The utility model discloses the automatic gain control equipment under a kind of time division multiplexing, it comprises variable gain and amplifies VGA circuit, analog-to-digital conversion AD circuit, simulation automatic growth control agc circuit and digital resources obtainment agc circuit, the signal output that variable gain amplifies VGA circuit is connected by the signal input of analog-to-digital conversion AD circuit with simulation automatic growth control agc circuit, the control output of simulation automatic growth control agc circuit is connected with the control inputs that variable gain amplifies VGA circuit, the signal of simulation automatic growth control agc circuit is exported and is connected with the signal input of back end signal processing unit by digital resources obtainment agc circuit, the triggering signal input of digital resources obtainment agc circuit receives burst indication signal.The mode that the utility model adopts simulation automatic growth control agc circuit to combine with digital resources obtainment agc circuit realizes automatic growth control, fast signal amplitude can be adjusted to desirable scope.
Description
Technical field
The utility model relates to the automatic gain control equipment under a kind of time division multiplexing.
Background technology
Time division multiplexing (Time-Division Multiplexing) is because of its applicable several data communication network, and bandwidth availability ratio advantages of higher is widely used in current main flow communication system, to meet growing data volume requirement.Communication data is divided into multiple time slot according to the time by time division multiplexing, and thus under time division multiplexing, signal is discontinuous transmission.According to common automatic growth control (AGC:Automatic Gain Control) method, because input signal energy accumulation unit cannot determine input signal time slot, noise energy may by the foundation as control automatic gain control unit; Cause burst more than AD sample range, and occur when AD samples saturated, affect subsequent digital signal process.Meanwhile, after direct automatic growth control module is positioned at AD, the accumulation impact of noise on automatic growth control energy is comparatively large, makes to adjust during gain to occur relatively large deviation.Thus, design auto gain control method under a kind of time division multiplexing and device just to seem and have significant practical applications very much.Auto gain control method under existing time division multiplexing is comparatively complicated, and the control characteristic of automatic growth control is affected by noise larger.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, automatic gain control equipment under a kind of time division multiplexing is provided, the mode adopting simulation automatic growth control agc circuit to combine with digital resources obtainment agc circuit realizes automatic growth control, fast signal amplitude can be adjusted to desirable scope.
The purpose of this utility model is achieved through the following technical solutions: the automatic gain control equipment under a kind of time division multiplexing, it comprises analog-to-digital conversion AD circuit, radio frequency unit and Base Band Unit, radio frequency unit comprises variable gain and amplifies VGA circuit, Base Band Unit comprises simulation automatic growth control agc circuit and digital resources obtainment agc circuit, the signal output part that variable gain amplifies VGA circuit is connected with the signal input part of analog-to-digital conversion AD circuit, the signal output part of analog-to-digital conversion AD circuit is connected with the signal input part of simulation automatic growth control agc circuit, the control output end of simulation automatic growth control agc circuit is connected with the control input end that variable gain amplifies VGA circuit, the signal output part of simulation automatic growth control agc circuit is connected with the signal input part of digital resources obtainment agc circuit, the triggering signal input of digital resources obtainment agc circuit is connected with the triggering signal output of rear end upper-layer protocol unit, the signal output part of digital resources obtainment agc circuit is connected with the signal input part of back end signal processing unit.
Described Base Band Unit also comprises down-conversion for adjusting input signal carrier frequency and sample rate and filter bank circuit, the signal input part of down-conversion and filter bank circuit is connected with the signal output part of simulation automatic growth control agc circuit, and the signal output part of down-conversion and filter bank circuit is connected with the signal input part of digital resources obtainment agc circuit.
Described digital resources obtainment agc circuit comprises cache module, energy computation module, comparator, gain determination module and multiplier, cache module is all connected with the signal output part of simulation automatic growth control agc circuit with the signal input part of energy computation module, the signal output part of cache module is connected with multiplier signal input part, the triggering signal input of energy computation module is connected with the triggering signal output of rear end upper-layer protocol unit, the data output end of energy computation module is connected with comparator data input pin, another data input pin of comparator receives the energy value of ideal signal, the data output end of comparator is connected with the data input pin of gain determination module, the signal output part of gain determination module is connected with another signal input part of multiplier, the signal output part of multiplier is connected with the signal input part of back end signal processing unit.
Described cache module is T1 to the cache-time of input signal, the energy accumulation time of energy computation module is T21, and the computing time of the yield value G of comparator is T22, and the gain of gain determination module determines that the time is T23, T21, T22 and T23 sum is that T2, T1 and T2 are equal.
Described simulation automatic growth control agc circuit comprises timer, energy computation module, comparator and selector, the signal input part of energy computation module is connected with the signal output part of analog-to-digital conversion AD circuit, the data output end of energy computation module is connected with comparator data input pin, another data input pin of comparator receives maximum energy value, the output of comparator is connected with the input of selector, the control input end that control output end and the variable gain of selector amplify VGA circuit is connected, and selector is also connected with timer.
The beneficial effects of the utility model are:
(1) simulating that automatic growth control agc circuit is used for can be undistorted by analog-to-digital conversion AD circuit by input signal, and this makes simulation automatic growth control agc circuit not need to carry out burst to judge, simplicity of design, quick;
(2) after digital resources obtainment agc circuit is positioned at down-conversion and filter bank circuit, the frequency deviation of signal is zero, and through filter filtering step by step, the good suppression that the noise outside band realizes, it is more accurate to control.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the automatic gain control equipment under the utility model time division multiplexing;
Fig. 2 is the structured flowchart of digital resources obtainment agc circuit in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection range of the present utility model is not limited to the following stated.
As shown in Figure 1, automatic gain control equipment under a kind of time division multiplexing, it comprises analog-to-digital conversion AD circuit, radio frequency unit and Base Band Unit, radio frequency unit comprises variable gain and amplifies VGA circuit, Base Band Unit comprises simulation automatic growth control agc circuit and digital resources obtainment agc circuit, the signal output part that variable gain amplifies VGA circuit is connected with the signal input part of analog-to-digital conversion AD circuit, the signal output part of analog-to-digital conversion AD circuit is connected with the signal input part of simulation automatic growth control agc circuit, the control output end of simulation automatic growth control agc circuit is connected with the control input end that variable gain amplifies VGA circuit, the signal output part of simulation automatic growth control agc circuit is connected with the signal input part of digital resources obtainment agc circuit, the triggering signal input of digital resources obtainment agc circuit is connected with the triggering signal output of rear end upper-layer protocol unit, the signal output part of digital resources obtainment agc circuit is connected with the signal input part of back end signal processing unit.
Described Base Band Unit also comprises down-conversion for adjusting input signal carrier frequency and sample rate and filter bank circuit, the signal input part of down-conversion and filter bank circuit is connected with the signal output part of simulation automatic growth control agc circuit, and the signal output part of down-conversion and filter bank circuit is connected with the signal input part of digital resources obtainment agc circuit.In Signals & Systems, input signal is in order to realize farther transmission, often in signal bandwidth, superpose a high frequency carrier, although this carrier wave is moved to a less value by radio frequency unit, but completely signal can not be changed to zero intermediate frequency, thus need to utilize down-conversion technique that input signal is moved to base band in digital end.Meanwhile, for many bandwidth system, adopt different AD sampling rate designs complicated, be difficult to control.At present adopt unified AD sampling rate more, then the conversion of mode realize target sample rate by extraction or interpolation filter joint group.After down-conversion and filtering, the frequency variate zero intermediate frequency of signal, and the noise outside band has been done good suppression due to filtering at different levels, make the Signal-to-Noise sending into digital resources obtainment agc circuit the highest.
Described variable gain amplifies the device cell that VGA circuit is a unique radio frequency unit in this device, for receiving input signal, and by simulating the given yield value of automatic growth control agc circuit, input signal is carried out Gain tuning at analog domain; Variable gain amplification VGA circuit can adjust input signal gain at analog domain, thus increase effective bit wide of input signal when entering analog-to-digital conversion AD circuit sampling before being arranged on analog-to-digital conversion AD circuit.
Described analog-to-digital conversion AD circuit with fixing sampling rate by amplifies through variable gain VGA circuit gain adjust after analog signal be converted to digital signal, so that follow-up Base Band Unit carries out Digital Signal Processing, the sample rate of analog-to-digital conversion AD circuit must meet nyquist sampling law.
Described simulation automatic growth control agc circuit comprises timer, energy computation module, comparator and selector, the signal input part of energy computation module is connected with the signal output part of analog-to-digital conversion AD circuit, the data output end of energy computation module is connected with comparator data input pin, another data input pin of comparator receives maximum energy value, the output of comparator is connected with the input of selector, the control input end that control output end and the variable gain of selector amplify VGA circuit is connected, and selector is also connected with timer.
The signal that described simulation automatic growth control agc circuit is come in analog-to-digital conversion AD circuit sampling, first through energy accumulation, calculates input signal energy value, then compares with maximum energy value, determine this unit output gain; The main purpose of simulation automatic growth control agc circuit controls variable gain to amplify the gain of VGA the regulation of electrical circuit, makes all input signals all can be undistorted by analog-to-digital conversion AD circuit.
Input signal is faded to zero intermediate frequency by described down-conversion and filter bank circuit, and utilizes bank of filters to extract or interpolation processing signal sampling rate, to meet design requirement.
Described digital resources obtainment agc circuit is last unit of automatic growth control model, this unit carries out energy statistics to input signal in the effective situation of burst instruction, and calculate the yield value needing adjustment, make amplitude output signal be desired amplitude.
As shown in Figure 2, described digital resources obtainment agc circuit comprises cache module, energy computation module, comparator, gain determination module and multiplier, cache module is all connected with the signal output part of simulation automatic growth control agc circuit with the signal input part of energy computation module, the signal output part of cache module is connected with multiplier signal input part, the triggering signal input of energy computation module is connected with the triggering signal output of rear end upper-layer protocol unit, the data output end of energy computation module is connected with comparator data input pin, another data input pin of comparator receives the energy value of ideal signal, the data output end of comparator is connected with the data input pin of gain determination module, the signal output part of gain determination module is connected with another signal input part of multiplier, the signal output part of multiplier is connected with the signal input part of back end signal processing unit.
Described cache module is T1 to the cache-time of input signal, the energy accumulation time of energy computation module is T21, and the computing time of the yield value G of comparator is T22, and the gain of gain determination module determines that the time is T23, T21, T22 and T23 sum is that T2, T1 and T2 are equal.
After input signal sends into digital resources obtainment agc circuit, be divided into two-way, cache module is given on a road, and energy statistics module is given on a road.Due to digital resources obtainment agc circuit carry out energy product involve gain judge time need the time to calculate, for the yield value preventing digital resources obtainment agc circuit from calculating lags behind input signal, thus introduce a cache module, the time that the gain that the storage depth of cache module is digital resources obtainment agc circuit is determined.The yield value that calculates just can be made in this way corresponding with the signal needing to adjust.The working method of cache module is, when digital resources obtainment agc circuit is started working, will input data stored in this cache module, after cache module is filled with data, then data exported, output speed is identical with input rate.
When the gain of digital resources obtainment agc circuit adjusts, first input signal enters energy computation module, because digital resources obtainment agc circuit receives the signal after down-conversion, the signal so sending into digital resources obtainment agc circuit is I, Q two-way, and energy computation module adopts following formula to calculate the energy value of input signal:
In formula: I
_ ithe energy value of I road signal i-th sampled point of-input digital resources obtainment agc circuit, Q
_ ithe energy value of Q road signal i-th sampled point of-input digital resources obtainment agc circuit, the sampling number of N-energy computation module statistics.The advantages such as it is little that this account form has operand, and speed is fast and be easy to design realize.
After calculating the energy value of input signal, comparator is by the energy value P of the energy value of input signal and ideal signal
d_idealcompare according to following formula:
G＝P
d_ideal/P
d_value
In formula: P
d_idealthe energy value of the ideal signal of-digital resources obtainment agc circuit, P
d_valuethe energy value of the input signal of-digital resources obtainment agc circuit; Draw yield value G, and the amplitude that can realize fast outputing signal of yield value G and the output signal of cache module being carried out being multiplied adjusts.
When digital resources obtainment agc circuit normally works, the energy computation module of signal is that the burst indication signal that sends with rear end upper-layer protocol unit is effectively for foundation, also the accumulation just starting to carry out signal energy when burst indication signal is effective is namely only had, and each burst indication signal this module effective only accumulates once energy value, this also just means in a burst, and digital resources obtainment agc circuit only to signal gain adjustment once.When the instruction that happens suddenly is invalid, energy computation module does not carry out the calculating of energy, and the yield value calculated when the value of yield value determination module keeps upper secondary burst instruction effective is constant.
Claims (5)
1. the automatic gain control equipment under a time division multiplexing, it is characterized in that: it comprises analog-to-digital conversion AD circuit, radio frequency unit and Base Band Unit, radio frequency unit comprises variable gain and amplifies VGA circuit, Base Band Unit comprises simulation automatic growth control agc circuit and digital resources obtainment agc circuit, the signal output part that variable gain amplifies VGA circuit is connected with the signal input part of analog-to-digital conversion AD circuit, the signal output part of analog-to-digital conversion AD circuit is connected with the signal input part of simulation automatic growth control agc circuit, the control output end of simulation automatic growth control agc circuit is connected with the control input end that variable gain amplifies VGA circuit, the signal output part of simulation automatic growth control agc circuit is connected with the signal input part of digital resources obtainment agc circuit, the triggering signal input of digital resources obtainment agc circuit is connected with the triggering signal output of rear end upper-layer protocol unit, the signal output part of digital resources obtainment agc circuit is connected with the signal input part of back end signal processing unit.
2. the automatic gain control equipment under a kind of time division multiplexing according to claim 1, it is characterized in that: described Base Band Unit also comprises down-conversion for adjusting input signal carrier frequency and sample rate and filter bank circuit, the signal input part of down-conversion and filter bank circuit is connected with the signal output part of simulation automatic growth control agc circuit, and the signal output part of down-conversion and filter bank circuit is connected with the signal input part of digital resources obtainment agc circuit.
3. the automatic gain control equipment under a kind of time division multiplexing according to claim 1, it is characterized in that: described digital resources obtainment agc circuit comprises cache module, energy computation module, comparator, gain determination module and multiplier, cache module is all connected with the signal output part of simulation automatic growth control agc circuit with the signal input part of energy computation module, the signal output part of cache module is connected with multiplier signal input part, the triggering signal input of energy computation module is connected with the triggering signal output of rear end upper-layer protocol unit, the data output end of energy computation module is connected with comparator data input pin, another data input pin of comparator receives the energy value of ideal signal, the data output end of comparator is connected with the data input pin of gain determination module, the signal output part of gain determination module is connected with another signal input part of multiplier, the signal output part of multiplier is connected with the signal input part of back end signal processing unit.
4. the automatic gain control equipment under a kind of time division multiplexing according to claim 3, it is characterized in that: described cache module is T1 to the cache-time of input signal, the energy accumulation time of energy computation module is T21, the computing time of the yield value G of comparator is T22, the gain of gain determination module determines that the time is T23, T21, T22 and T23 sum is that T2, T1 and T2 are equal.
5. the automatic gain control equipment under a kind of time division multiplexing according to claim 1, it is characterized in that: described simulation automatic growth control agc circuit comprises timer, energy computation module, comparator and selector, the signal input part of energy computation module is connected with the signal output part of analog-to-digital conversion AD circuit, the data output end of energy computation module is connected with comparator data input pin, another data input pin of comparator receives maximum energy value, the output of comparator is connected with the input of selector, the control input end that control output end and the variable gain of selector amplify VGA circuit is connected, selector is also connected with timer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11025217B2 (en) | 2018-02-13 | 2021-06-01 | Abb Power Grids Switzerland Ag | Fast automatic gain control for high performance wireless communications in substation automation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11025217B2 (en) | 2018-02-13 | 2021-06-01 | Abb Power Grids Switzerland Ag | Fast automatic gain control for high performance wireless communications in substation automation |
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Address after: 610000 Building 1, No. 11, Gaopeng Avenue, Chengdu hi tech Zone, Chengdu, Sichuan Patentee after: Chengdu Guoheng Space Technology Engineering Co.,Ltd. Address before: No. 1 high tech Zone Gaopeng road in Chengdu city of Sichuan Province in 610041 Patentee before: CHENGDU GUOHENG SPACE TECHNOLOGY ENGINEERING Co.,Ltd. |
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