CN103220018B - 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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- CN103220018B CN103220018B CN201310087270.6A CN201310087270A CN103220018B CN 103220018 B CN103220018 B CN 103220018B CN 201310087270 A CN201310087270 A CN 201310087270A CN 103220018 B CN103220018 B CN 103220018B
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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 communication network, belong to the technical field of power carrier.
Background technology
In a power line communication system, carrier signal is when transmitting, because the randomness of communication node mounting distance, power line are decayed to obtain the impact of the factor such as change at random of randomness and power line load, the carrier signal power be received externally can change in real time, this barrier signal level that receiving terminal is received also changes in real time, barrier signal level whether stablize the transmission quality directly affecting carrier communication system.In prior art, when detecting real-time carrier signal, when having detected that carrier signal is transmitted on power line, power line communications apparatus just proceeds to transmission and the processing procedure of carrier signal, the signal excursion that communication equipment receives is very large, the strongest with may differ tens decibels between the most weak signal, be unfavorable for analog-to-digital conversion; And automatic gain control unit Received signal strength alters a great deal, the gain (namely using fixed step size method of adjustment) of programmable amplifier is changed according to preset adjustment, when the change that the gain needs of programmable amplifier are larger, automatic gain control unit needs repeatedly to adjust, and makes the regulation time of automatic gain control unit very long.The gain of the amplifier that accepts filter of general power line carrier, PLC signal can not adjust in real time, and carrier signal transmit in power line have decay and can noise jamming be subject to, the power of signal between two communication nodes in power line is caused to change, make carrier signal transmission unreliable, 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 communication network, when its objective is that solving carrier signal in power line carrier communication crosses by force or cross weak, cause the carrier communication on power line unreliable, the problem that the real time communication rate of signal is not high.
An auto gain control method in power line carrier communication network, comprises front-end low noise amplifier, active bandpass filiter, programmable gain amplifier, AD conversion unit and automatic gain control unit; Input carrier signal first carries out low noise amplification to the signal of input through front-end low noise amplifier, after bandpass filtering, obtains the carrier signal that signal to noise ratio is higher; By programmable amplifier, carrier signal is amplified again, programmable gain amplifier initial yield value is set to the maximum of Pre-set reference scope, after the carrier signal of input is amplified, carry out analog-to-digital conversion again, carrier signal after transforming is sampled, and acquisition sampled signal is carried out medium filtering, obtain carrier signal mean intensity; The size of programmable gain amplifier gain is adjusted according to the difference of carrier signal mean intensity and preset reference value.
Adjust the size of programmable-gain according to the mean intensity of carrier signal and the difference of preset reference value, concrete adjustment mode is as follows:
If TH is the maximum of Pre-set reference, TL is the minimum value of Pre-set 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 in actual application environment, will pass through software design patterns.Its size order is TH>A>B>CGreatT .GreaT.GTD>TL.
As the carrier signal strength R>TH calculated.The gain of programmable gain amplifier is set to Av1.
As the carrier signal strength TH>R>A calculated.The gain of programmable gain amplifier is set to Av2.
As the carrier signal strength A>R>B calculated.The gain of programmable gain amplifier is set to Av3.
As the carrier signal strength B>R>C calculated.The gain of programmable gain amplifier is set to Av4.
As the carrier signal strength C>R>D calculated.The gain of programmable gain amplifier is set to Av5.
As the carrier signal strength D>R>TL calculated.The gain of programmable gain amplifier is set to Av6.
As the carrier signal strength R<TL calculated.The gain of programmable gain amplifier is set to Av7.
Carrier signal is after medium filtering, calculating the averaged magnitude R obtained is real-time change, mathematic interpolation according to mean value and preset reference range adjusts the gain of AFE (analog front end) programmable gain amplifier, when input signal is changed greatly, the amplitude of the signal of output keeps constant or changes in specific working range.Carrier signal is by automatic gain control, and after analog-to-digital conversion, output signal has the better linearity.
Pass through automatic gain control unit, the gain of programmable amplifier can be made automatically to adjust along with the power of carrier signal, be unlikely to because input signal is too little and cannot normally work, be also unlikely to because input signal is too large and make receiver that saturated or blocking occur.The carrier signal received in actual applications is not occurred saturated or too small.Ensure that the carrier signal of input has enough dynamic ranges, at this moment the change of output voltage amplitude within the range of permission, should can improve the receiving sensitivity of carrier wave, enables carrier signal in ambient temperature, power line is decayed, and works normally in power line when noise jamming.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, as schemed wherein:
Fig. 1 is AGC (automatic gain control) system block diagram.
Fig. 2 is the flow chart of automatic gain processing unit.
Fig. 3 is power line carrier communication network structure chart.
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment
Obviously, the many modifications and variations that those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
Embodiment 1: the auto gain control method in a kind of power line carrier communication network,
If Fig. 1 is 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-pole input after, front-end low noise amplifier 1 first carries out low noise amplification to the carrier signal of input, front-end low noise amplifier 1 connects active band-pass filter 2, active band-pass filter 2 sends carrier signal higher for signal to noise ratio to programmable gain amplifier 3, the yield value of programmable gain amplifier 3 initial condition is set to the maximum of Pre-set reference scope, signal is connected modulus conversion unit 4 by programmable gain amplifier 3, feedback link programmable gain amplifier 3 after automatic gain processing unit 5, front-end low noise amplifier 1 and programmable gain amplifier 3+pole input is reference point.
As shown in Figure 2, after the carrier signal inputted carries out low noise amplification bandpass filtering and analog-to-digital conversion unit, automatic gain control unit is sampled to the signal after analog-to-digital conversion, and the signal of sampling is carried out medium filtering, the mean intensity R of the carrier signal of calculating sampling, the mean intensity R of signal be according to medium filtering after real-time sampling carried out to signal calculate in real time.
Adjust the size of programmable-gain according to the mean intensity of carrier signal and the difference of preset reference value, concrete adjustment mode is as follows:
If TH is the maximum of Pre-set reference, TL is the minimum value of Pre-set reference, A, B, C, D are the value between TH and TL, the selection of TH, A, B, C, D, TL reference value will in actual application environment, by software design patterns, its size order is TH>A>B>CGreatT .GreaT.GTD>TL.
As the carrier signal strength R>TH calculated.The gain of programmable gain amplifier is set to Av1.
As the carrier signal strength TH>R>A calculated.The gain of programmable gain amplifier is set to Av2.
As the carrier signal strength A>R>B calculated.The gain of programmable gain amplifier is set to Av3.
As the carrier signal strength B>R>C calculated.The gain of programmable gain amplifier is set to Av4.
As the carrier signal strength C>R>D calculated.The gain of programmable gain amplifier is set to Av5.
As the carrier signal strength D>R>TL calculated.The gain of programmable gain amplifier is set to Av6.
As the carrier signal strength R<TL calculated.The gain of programmable gain amplifier is set to Av7.
Be illustrated in figure 3 power line carrier communication network structure chart, comprising host node with from node, in order to simplify, A in Fig. 3 is 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, from node dispersion throughout this network.Host node with carry out from node network be connected time, as shown in Figure 3, during as host node A with from node C distant, host node A sends carrier signal, because the distance of power line communication node is far away to from node C, load is more, during carrier signal transmission, decay is larger, and the signal that C node receives is more weak, when automatic ride gain unit inspection is less than the minimum value of preset reference value to signal strength signal intensity, the gain of programmable gain amplifier can be increased, increase the intensity of the carrier signal of AFE (analog front end).Improve the efficiency of analog-to-digital conversion.When host node and nearer from nodal distance time, as host node A in Fig. 3 with from shown in node D.The decay of carrier signal in power line is less and impact by power line is less, the carrier signal received from node is stronger, when automatic gain control unit detects that signal strength signal intensity is greater than the maximum of preset reference value, automatic gain control unit will reduce the gain of programmable gain amplifier, reduces 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 impact disturbed is also little time, as host node A in Fig. 3 with from shown in Node B.From Node-B receiver to carrier signal, through the mean intensity of the detection of automatic control unit in preset term of reference, then terminate automatic gain control unit, signal carries out the process of next stage.
Those skilled in the art will understand further, can be implemented as electronic hardware, computer software or both combination in conjunction with the system block diagram openly described, circuit and algorithm steps herein.For this interchangeability of hardware and software is clearly described, various Illustrative components, frame, circuit and step are do vague generalization with the form of its function collection to describe above.This type of function collection is implemented as hardware or software depends on embody rule and forces at the design constraint of total system.Technical staff can realize described function collection by different way for often kind of application-specific, but this type of realizes decision-making and should not be interpreted as causing disengaging the scope of the present disclosure.
Claims (1)
1. the auto gain control method in power line carrier communication network, is characterized in that comprising front-end low noise amplifier, active bandpass filiter, programmable gain amplifier, AD conversion unit and automatic gain control unit; Input carrier signal first carries out low noise amplification to the signal of input through front-end low noise amplifier, after bandpass filtering, obtains the carrier signal that signal to noise ratio is higher; By programmable gain amplifier, carrier signal is amplified again, programmable gain amplifier initial yield value is set to the maximum of Pre-set reference scope, after the carrier signal of input is amplified, carry out analog-to-digital conversion again, carrier signal after transforming is sampled, and acquisition sampled signal is carried out medium filtering, obtain carrier signal mean intensity; The size of programmable gain amplifier gain is adjusted according to the difference of carrier signal mean intensity and preset reference value; Digital signal after analog-to-digital conversion is sampled, medium filtering, the mean intensity of calculating sampling signal, calculating power line carrier sampled signal mean intensity and preset reference range are compared, if the mean intensity of the carrier signal that automatic gain control unit calculates is not within the scope of preset reference value, then adjust the gain of programmable gain amplifier; If the carrier signal mean intensity that automatic gain control unit calculates within the scope of Pre-set reference, then terminates gain-adjusted automatically; Preset reference range is according to application actual environment, is dynamically arranged determine by application software;
Adjust the size of programmable-gain according to the mean intensity of carrier signal and the difference of preset reference value, concrete adjustment mode is as follows:
If TH is the maximum of Pre-set reference, TL is the minimum value of Pre-set 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 in actual application environment, will pass through software design patterns; Its size order is TH>A>B>CGreatT .GreaT.GTD>TL;
As the carrier signal strength R>TH calculated; The gain of programmable gain amplifier is set to Av1;
As the carrier signal strength TH>R>A calculated; The gain of programmable gain amplifier is set to Av2;
As the carrier signal strength A>R>B calculated; The gain of programmable gain amplifier is set to Av3;
As the carrier signal strength B>R>C calculated; The gain of programmable gain amplifier is set to Av4;
As the carrier signal strength C>R>D calculated; The gain of programmable gain amplifier is set to Av5;
As the carrier signal strength D>R>TL calculated; The gain of programmable gain amplifier is set to Av6;
As the carrier signal strength R<TL calculated; The gain of programmable gain amplifier is set to Av7.
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| 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 |
| 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 |
| CN106549690B (en) * | 2016-11-05 | 2020-04-07 | 北京晓程科技股份有限公司 | Automatic gain control method and device for power carrier communication system |
| 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 |
| CN112737637B (en) * | 2020-12-24 | 2022-11-15 | 阳光电源股份有限公司 | Power carrier communication crosstalk optimization method and photovoltaic system |
| CN115333646B (en) * | 2022-08-29 | 2023-07-28 | 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847973A (en) * | 2010-05-26 | 2010-09-29 | 深圳市力合微电子有限公司 | Automatic gain control circuit for receiving end of power-line carrier communication system |
| CN102195681A (en) * | 2010-03-10 | 2011-09-21 | 青岛东软载波科技股份有限公司 | Demodulation signal gain control method and device and microcontroller |
| CN102427376A (en) * | 2011-12-09 | 2012-04-25 | 上海翊昊微电子有限公司 | Power line carrier communication system and method |
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| US8160527B2 (en) * | 2009-03-30 | 2012-04-17 | Telefonaktiebolaget Lm Ericsson (Publ) | Automatic gain control in multi-carrier wireless systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195681A (en) * | 2010-03-10 | 2011-09-21 | 青岛东软载波科技股份有限公司 | Demodulation signal gain control method and device and microcontroller |
| CN101847973A (en) * | 2010-05-26 | 2010-09-29 | 深圳市力合微电子有限公司 | Automatic gain control circuit for receiving end of power-line carrier communication system |
| CN102427376A (en) * | 2011-12-09 | 2012-04-25 | 上海翊昊微电子有限公司 | Power line carrier communication system and method |
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