CN103220018A - Control method of automatic gain in power line carrier communication network - Google Patents
Control method of automatic gain in power line carrier communication network Download PDFInfo
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- CN103220018A CN103220018A CN2013100872706A CN201310087270A CN103220018A CN 103220018 A CN103220018 A CN 103220018A CN 2013100872706 A CN2013100872706 A CN 2013100872706A CN 201310087270 A CN201310087270 A CN 201310087270A CN 103220018 A CN103220018 A CN 103220018A
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Abstract
The invention discloses a control method of an automatic gain in a power line carrier communication network, and belongs to the technical field of power line carriers. The control method relates to a front end low noise amplifier, an active band-pass filter, a programmable gain amplifier, an analog-digital conversion unit and an automatic gain control unit. The method comprises the steps that an input carrier signal passes through the front end low noise amplifier, lower noise amplification is conducted on the input signal firstly, and after band-pass filtering, the carrier signal with a high signal-to-noise ratio is obtained; the carrier signal is amplified through the programmable gain amplifier, an initial gain value of the programmable gain amplifier is set to be the maximum value in a preset reference range, analog-digital conversion is conducted on the input carrier signal after the input carrier signal is amplified, sampling is conducted on the converted carrier signal, and median filtering is conducted on an obtained sampling signal to obtain average intensity of the carrier signal; and the gain of the programmable gain amplifier can be adjusted according to a difference between the average intensity of the carrier signal and the preset reference range.
Description
Technical field
The present invention relates to the auto gain control method in a kind of power line carrier, PLC network, belong to the technical field of power carrier.
Background technology
In electric line communication system, carrier signal is when transmission, since randomness, the power line of communication node mounting distance decay the influence of factors such as change at random of randomness and power line load, the carrier signal power that receives from the outside can change in real time, this carrier signal level that makes receiving terminal receive also changes in real time, and whether the carrier signal stabilization of level directly affects the transmission quality of carrier communication system.In the prior art, when real-time carrier signal is detected, transmit on power line when having detected carrier signal, power line communications apparatus just changes the transmission and the processing procedure of carrier signal over to, the signal excursion that communication equipment receives is very big, may differ tens decibels between the strongest and the most weak signal, be unfavorable for analog-to-digital conversion; And the automatic gain control unit received signal alters a great deal, change the gain (promptly using the fixed step size method of adjustment) of programmable amplifier according to the adjustment of presetting, when the gain of programmable amplifier needs bigger change, automatic gain control unit need repeatedly be adjusted, and makes the adjustment time of automatic gain control unit very long.The Amplifier Gain that accepts filter of general power line carrier, PLC signal can not be adjusted in real time, and carrier signal in power line, transmit have the decay and can be subjected to noise jamming, cause in the power line that the power of signal can change between two communication nodes, make the carrier signal transmission unreliable, the real time communication rate is not high.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides the auto gain control method in a kind of power line carrier, PLC network, its objective is that solving in the power line carrier communication carrier signal crosses strong or cross when weak, cause the carrier communication on the power line unreliable, the not high problem of real time communication rate of signal.
Auto gain control method in a kind of power line carrier, PLC network comprises the front end low noise amplifier, active bandpass filtering, programmable gain amplifier, AD conversion unit and automatic gain control unit; Input carrier signal carries out the low noise amplification to the signal of input earlier through the front end low noise amplifier, behind the bandpass filtering, obtains the higher carrier signal of signal to noise ratio; By programmable amplifier carrier signal is amplified again, the programmable gain amplifier initial yield value is set to preset the maximum of term of reference, to the input carrier signal amplify after, carry out analog-to-digital conversion again, carrier signal after transforming is sampled, and will obtain sampled signal and carry out medium filtering, obtain the carrier signal mean intensity; Adjust the size of programmable gain amplifier gain according to the difference of carrier signal mean intensity and preset reference value.
Adjust the size of programmable-gain according to the difference of the mean intensity of carrier signal and preset reference value, it is as follows specifically to adjust mode:
If TH is the maximum that presets reference, TL is the minimum value that presets reference, and A, B, C, D are the value between TH and TL, and the selection of TH, A, B, C, D, TL reference value will be arrived in the actual application environment, passes through software setting.Its size order is TH〉A〉B〉C〉D〉TL.
As the carrier signal strength R that calculates〉during TH.The gain of programmable gain amplifier is set to Av1.
As the carrier signal strength TH that calculates〉R〉during A.The gain of programmable gain amplifier is set to Av2.
As the carrier signal strength A that calculates〉R〉during B.The gain of programmable gain amplifier is set to Av3.
As the carrier signal strength B that calculates〉R〉during C.The gain of programmable gain amplifier is set to Av4.
As the carrier signal strength C that calculates〉R〉during D.The gain of programmable gain amplifier is set to Av5.
As the carrier signal strength D that calculates〉R〉during TL.The gain of programmable gain amplifier is set to Av6.
When the carrier signal strength R that calculates＜TL.The gain of programmable gain amplifier is set to Av7.
Carrier signal is through behind the medium filtering, the averaged magnitude R that calculating is obtained is a real-time change, calculate the gain of adjustment AFE (analog front end) programmable gain amplifier according to the mean value and the difference of the reference range that presets, make under the input signal variation situation greatly, the amplitude of the signal of output keeps constant or changes in specific working range.Carrier signal is by automatic gain control, and output signal has the better linearity after analog-to-digital conversion.
Pass through automatic gain control unit, the gain of programmable amplifier is adjusted automatically along with the power of carrier signal, being unlikely to because input signal is too little can't operate as normal, also is unlikely to make receiver take place saturated because input signal is too big or stop up.Make the carrier signal that receives in actual applications not occur saturated or too small.The carrier signal that guarantees input has enough dynamic ranges, at this moment the variation of output voltage amplitude should can improve the receiving sensitivity of carrier wave within the range of permission, makes the carrier signal can be in ambient temperature, the power line decay is worked under the situation of noise jamming in the power line normally.
Description of drawings
When considered in conjunction with the accompanying drawings, by the reference following detailed, can more completely understand the present invention better and learn wherein many attendant advantages easily, but accompanying drawing described herein is used to provide further understanding of the present invention, constitute a part of the present invention, illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention, as figure wherein:
Fig. 1 is the AGC (automatic gain control) system block diagram.
Fig. 2 is the flow chart of automatic gain processing unit.
Fig. 3 is the power line carrier, PLC network structure.
The present invention is further described below in conjunction with drawings and Examples.
Embodiment
Obviously, the many modifications and variations done based on aim of the present invention of those skilled in the art belong to protection scope of the present invention.
Embodiment 1: the auto gain control method in a kind of power line carrier, PLC network,
As Fig. 1 is the AGC (automatic gain control) system block diagram, comprising: front end low noise amplifier 1, active band-pass filter 2, programmable gain amplifier 3, analog-to-digital conversion unit 4, automatic gain processing unit 5.When carrier signal input to front end low noise amplifier 1-utmost point input after, front end low noise amplifier 1 carries out low noise to the carrier signal of input earlier and amplifies, front end low noise amplifier 1 connects active band-pass filter 2, active band-pass filter 2 carrier signal that signal to noise ratio is higher sends programmable gain amplifier 3 to, the yield value of programmable gain amplifier 3 initial conditions is set to preset the maximum of term of reference, programmable gain amplifier 3 connects modulus conversion unit 4 with signal, automatic gain processing unit 5 back feedbacks connect programmable gain amplifier 3, front end low noise amplifier 1 and programmable gain amplifier 3+utmost point input is a reference point.
As shown in Figure 2, after the carrier signal of input is carried out low noise amplification bandpass filtering and analog-to-digital conversion unit, the signal of automatic gain control unit after to analog-to-digital conversion sampled, and with the sampling signal carry out medium filtering, the mean intensity R of the carrier signal of calculating sampling, the mean intensity R of signal are according to signal is carried out real-time sampling calculate in real time behind the medium filtering.
Adjust the size of programmable-gain according to the difference of the mean intensity of carrier signal and preset reference value, it is as follows specifically to adjust mode:
If TH is the maximum that presets reference, TL is the minimum value that presets reference, and A, B, C, D are the value between TH and TL, and the selection of TH, A, B, C, D, TL reference value will be arrived in the actual application environment, by software setting, its size order is TH〉A〉B〉C〉D〉TL.
As the carrier signal strength R that calculates〉during TH.The gain of programmable gain amplifier is set to Av1.
As the carrier signal strength TH that calculates〉R〉during A.The gain of programmable gain amplifier is set to Av2.
As the carrier signal strength A that calculates〉R〉during B.The gain of programmable gain amplifier is set to Av3.
As the carrier signal strength B that calculates〉R〉during C.The gain of programmable gain amplifier is set to Av4.
As the carrier signal strength C that calculates〉R〉during D.The gain of programmable gain amplifier is set to Av5.
As the carrier signal strength D that calculates〉R〉during TL.The gain of programmable gain amplifier is set to Av6.
When the carrier signal strength R that calculates＜TL.The gain of programmable gain amplifier is set to Av7.
Be illustrated in figure 3 as the power line carrier, PLC network structure, comprising host node with from node, in order to simplify, A among Fig. 3 is a host node, B, C, D, E, F, G, H, I, J are from node, and host node A is the fixed station of this communication network, disperse to spread all over this network from node.Host node with carry out network from node when being connected, as shown in Figure 3, as host node A with from the distance of node C when far away, host node A is to sending carrier signal from node C, because the distance of power line communication node is far away more, load is many more, carrier signal when transmission decay is big more, and the signal that the C node receives is more weak, when the ride gain unit detects signal strength signal intensity less than the minimum value of preset reference value automatically, can increase the gain of programmable gain amplifier, increase the intensity of the carrier signal of AFE (analog front end).Improve the efficient of analog-to-digital conversion.When host node with from nodal distance when nearer, as host node A among Fig. 3 with from shown in the node D.The decay of carrier signal in power line is less and be subjected to the influence of power line less, the carrier signal that receives from node is stronger, when automatic gain control unit detects signal strength signal intensity greater than the maximum of preset reference value, automatic gain control unit will reduce the gain of programmable gain amplifier, reduce the intensity of the carrier signal of AFE (analog front end).When host node and from the distance of node moderate and decayed and the influence disturbed also hour, as host node A among Fig. 3 with from shown in the Node B.The carrier signal that receives from Node B in the term of reference that the mean intensity of the detection of automatic control unit is presetting, then finishes automatic gain control unit, and signal carries out the processing of next stage.
Those skilled in the art will further understand, and system block diagram, circuit and the algorithm steps openly described in conjunction with this paper can be implemented as electronic hardware, computer software or both combinations.For this interchangeability of hardware and software clearly is described, various Illustrative components, frame, circuit and step are to do vague generalization with the form of its function collection to describe in the above.This type of function collection is implemented as the design constraint that hardware or software depend on concrete application and forces at total system.The technical staff can realize described function collection by different way at every kind of application-specific, but this type of realizes that decision-making should not be interpreted as causing disengaging the scope of the present disclosure.
Claims (3)
1. the auto gain control method in the power line carrier, PLC network is characterized in that comprising the front end low noise amplifier, active bandpass filtering, programmable gain amplifier, AD conversion unit and automatic gain control unit; Input carrier signal carries out the low noise amplification to the signal of input earlier through the front end low noise amplifier, behind the bandpass filtering, obtains the higher carrier signal of signal to noise ratio; By programmable gain amplifier carrier signal is amplified again, the programmable gain amplifier initial yield value is set to preset the maximum of term of reference, to the input carrier signal amplify after, carry out analog-to-digital conversion again, carrier signal after transforming is sampled, and will obtain sampled signal and carry out medium filtering, obtain the carrier signal mean intensity; Adjust the size of programmable gain amplifier gain according to the difference of carrier signal mean intensity and preset reference value.
2. the auto gain control method in a kind of power line carrier, PLC network according to claim 1, it is characterized in that the digital signal after the analog-to-digital conversion is sampled, medium filtering, the mean intensity of calculating sampling signal, compare with the reference range that presets calculating power line carrier sampled signal mean intensity, if the mean intensity of the carrier signal that automatic gain control unit calculates is then adjusted the gain of programmable gain amplifier not in the preset reference value scope; If the carrier signal mean intensity that automatic gain control unit calculates then finishes gain-adjusted automatically in presetting term of reference.
3. according to the auto gain control method in claim 1 and the 2 described a kind of power line carrier, PLC networks, it is characterized in that the reference range that presets is according to using actual environment, being dynamically arranged definite by application software.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105337917A (en) * | 2014-08-06 | 2016-02-17 | 南京能瑞自动化设备股份有限公司 | Gain compensation technology for orthogonal frequency division multiplexing (OFDM) power line carrier communication chip |
| CN106253949A (en) * | 2016-07-27 | 2016-12-21 | 杭州讯能科技有限公司 | The gain control method of a kind of power line carrier communication, device and communication module |
| CN106549690A (en) * | 2016-11-05 | 2017-03-29 | 北京晓程科技股份有限公司 | Power carrier communication system auto gain control method and device |
| CN110380757A (en) * | 2019-05-27 | 2019-10-25 | 上海感拓智能科技有限公司 | A kind of self-adaptive electric power carrier wave communication device |
| CN111600563A (en) * | 2019-08-28 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Gain control device for two-stage programmable amplifier for power line communication |
| CN112511191A (en) * | 2020-10-26 | 2021-03-16 | 青岛鼎信通讯股份有限公司 | Automatic gain control device for medium-voltage power line signal acquisition |
| CN112737637A (en) * | 2020-12-24 | 2021-04-30 | 阳光电源股份有限公司 | Power carrier communication crosstalk optimization method and photovoltaic system |
| CN115333646A (en) * | 2022-08-29 | 2022-11-11 | 云南保利天同水下装备科技有限公司 | Underwater acoustic communicator and signal automatic gain control method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337917A (en) * | 2014-08-06 | 2016-02-17 | 南京能瑞自动化设备股份有限公司 | Gain compensation technology for orthogonal frequency division multiplexing (OFDM) power line carrier communication chip |
| CN106253949A (en) * | 2016-07-27 | 2016-12-21 | 杭州讯能科技有限公司 | The gain control method of a kind of power line carrier communication, device and communication module |
| CN106253949B (en) * | 2016-07-27 | 2018-08-10 | 杭州讯能科技有限公司 | A kind of gain control method of power line carrier communication, device and communication module |
| CN106549690A (en) * | 2016-11-05 | 2017-03-29 | 北京晓程科技股份有限公司 | Power carrier communication system auto gain control method and device |
| CN110380757A (en) * | 2019-05-27 | 2019-10-25 | 上海感拓智能科技有限公司 | A kind of self-adaptive electric power carrier wave communication device |
| CN110380757B (en) * | 2019-05-27 | 2021-12-21 | 上海感拓智能科技有限公司 | Self-adaptive power carrier communication device |
| CN111600563A (en) * | 2019-08-28 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Gain control device for two-stage programmable amplifier for power line communication |
| CN112511191A (en) * | 2020-10-26 | 2021-03-16 | 青岛鼎信通讯股份有限公司 | Automatic gain control device for medium-voltage power line signal acquisition |
| CN112737637A (en) * | 2020-12-24 | 2021-04-30 | 阳光电源股份有限公司 | Power carrier communication crosstalk optimization method and photovoltaic system |
| CN115333646A (en) * | 2022-08-29 | 2022-11-11 | 云南保利天同水下装备科技有限公司 | Underwater acoustic communicator and signal automatic gain control method thereof |
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