CN111600563A - Gain control device for two-stage programmable amplifier for power line communication - Google Patents
Gain control device for two-stage programmable amplifier for power line communication Download PDFInfo
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- CN111600563A CN111600563A CN201910798815.1A CN201910798815A CN111600563A CN 111600563 A CN111600563 A CN 111600563A CN 201910798815 A CN201910798815 A CN 201910798815A CN 111600563 A CN111600563 A CN 111600563A
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- 238000004891 communication Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
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- Engineering & Computer Science (AREA)
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- Control Of Amplification And Gain Control (AREA)
Abstract
The invention discloses an automatic gain control device with a two-stage programmable power amplifier (PGA) applied to broadband power line carrier communication (PLC). The method is characterized in that: comprises a two-stage programmable power amplifier; the carrier signal on the power line is amplified or reduced through the two-stage programmable power amplifier; then, the system judges the amplitude range of the current signal according to the acquired digital signal through a digital-to-analog conversion circuit; by comparison with the expected signal amplitude, the gain required currently is given; finally, the gain is converted into a parameter which can be used by the two-stage programmable power amplifier. The invention is used in a broadband power line communication system modulated by Orthogonal Frequency Division Multiplexing (OFDM).
Description
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to an automatic gain control device with a two-stage programmable power amplifier, which is applied to an orthogonal frequency division multiplexing system.
Background
Power Line Carrier-PLC (Power Line Carrier-PLC) communication is a special communication method for voice or data transmission using a high voltage Power Line (generally, 35kV or higher), a medium voltage Power Line (generally, 10 kV) or a low voltage Power distribution Line (380/220V subscriber Line) as an information transmission medium. Because the power line network is widely distributed, the power line is used as a communication medium, and the communication network is not required to be reconstructed by punching and wiring indoors, so that the power line network has the advantages of low cost, convenience in connection and the like, and is paid more and more attention to the aspects of smart power grids and broadband access.
Orthogonal Frequency Division Multiplexing (OFDM) divides a given channel into a number of Orthogonal sub-channels in the Frequency domain, modulates each sub-channel with one sub-carrier, and transmits the sub-carriers in parallel, thereby effectively suppressing inter-symbol interference (ISI) caused by the time dispersion of the channel. The OFDM combines coding and diversity copying, and can improve the reliability of the system to the maximum extent.
The power line is never an ideal communication medium, the power line channel environment is extremely bad, and the multipath fading is obvious. The performance of power line communication is mainly restricted by the power line communication environment. The impedance on the power line is changed greatly, the power line carrier signal is influenced by the impedance, and the amplitude change is large. Therefore, in order to ensure sufficient sensitivity of the receiver when transmitting signals over the power line, an automatic control device for the two-stage programmable gain amplifier is necessary.
Disclosure of Invention
In order to solve the above problems in the background art, the present invention provides an automatic gain control apparatus with a two-stage programmable power amplifier for power line carrier communication, the apparatus comprising the following devices: the device comprises a two-stage programmable power amplifier, a digital-to-analog converter, an amplitude balancer and a gain converter. These devices are connected in series. And the output of the gain converter is used for controlling the amplification or reduction amplitude of the programmable power amplifier. The specific processing flow is as follows:
(1) the device receives a carrier signal from a power line and amplifies or reduces the signal through a two-stage programmable power amplifier;
(2) the amplified or reduced signal is converted into a digital signal through a digital-to-analog conversion circuit;
(3) evaluating the amplitude intensity of the received power line carrier signal by using the digital signal, mainly comparing the difference with the amplitude of an expected signal;
(4) converting the difference into power gain, configuring two-stage programming power amplifier according to gain comparison table, and adjusting the two-stage power amplifier.
Furthermore, the gain range of each programmable power amplifier is-10 to 35dB, the stepping gain is 3dB, the bit width of the control signal is 4 bits, and the 16-system 0 to F respectively correspond to the gains-10 to 35 dB.
Furthermore, the two programmable power amplifiers are connected in a cascade manner, that is, the first-stage programmable power amplifier firstly amplifies or reduces the carrier signal on the power line, and the amplified or reduced carrier signal passes through the second-season programmable power amplifier to be amplified or reduced for the second time.
Further, the amplitude measurement measures the amplitude of the current power line carrier signal according to the digital signal generated by the digital-to-analog converter, and compares the measured amplitude with an expected amplitude to generate the currently required gain.
Further, the amplitude measurement mode is to count the average power of the digital signal after the digital-to-analog conversion circuit, and the counting time length is 1 OFDM symbol length.
Further, the desired amplitude is set based on an average of the power of a plurality of full-amplitude OFDM symbols.
Further, the gain converter distributes the gain to the two programmable power amplifiers according to the gain generated by the amplitude converter and according to the gain combination table.
Further, the gain converter calculates the ratio of the result produced by the amplitude balancer to the desired amplitude value and quantizes the ratio, spaced by 3dB gain values.
Further, the gain allocation method is as follows: the gain range that can be allocated is-20 to 70 dB. In a gain range of-20-25 dB, parameters distributed to the first-stage programmable power amplifier are 0 all the time, and parameters distributed to the second-stage programmable power amplifier are 0-F; in a gain range of 28-70 dB, a parameter which is always distributed to the first-stage programmable power amplifier is F, and a parameter which is distributed to the second-stage programmable power amplifier is 0-F.
Fig. 1 is a circuit configuration diagram of an automatic control device of a two-stage programmable power amplifier applied to power line communication according to an embodiment of the present invention.
Drawings
FIG. 1 is a block diagram of the circuit configuration of the present invention;
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic circuit diagram with automatic gain control of a dual programmable power amplifier applied to power line carrier communication according to an embodiment of the present invention.
The device comprises the following equipment: the device comprises a two-stage programmable power amplifier, a digital-to-analog converter, an amplitude balancer and a gain converter. These devices are connected in series. And the output of the gain converter is used for controlling the amplification or reduction amplitude of the programmable power amplifier. The specific data processing flow is as follows:
(1) the device is connected with a carrier signal on a power line, and amplifies or reduces the signal through a two-stage programmable power amplifier, wherein the amplification gain of the two-stage programmable gain amplifier is set to be 0dB in an initial state. The gain range of each programmable power amplifier is-10-35 dB, the stepping gain is 3dB, the bit width of the control signal is 4 bits, and the 16-system 0-F respectively corresponds to the gain of-10-35 dB. The gain range of each programmable power amplifier is-10-35 dB, the stepping gain is 3dB, the bit width of the control signal is 4 bits, and the 16-system 0-F respectively corresponds to the gain of-10-35 dB.
(2) The digital-to-analog conversion circuit converts the power line carrier signal passing through the two-stage programmable power amplifier into a digital signal;
(3) in the embodiment, the amplitude balancer calculates the average power of the digital signal in the window in a sliding window form, wherein the window length is L, the calculated average power is P, and the expected power is Pref;
(4) in this embodiment, the gain converter uses the result of the expression 3log (Pref/P) and takes the integer as the required gain value, and adjusts the amplification gain of the two-stage power amplifier according to the parameters of the corresponding two-stage programmed power amplifier given by the gain allocation method. The gain range which can be distributed by the gain distribution method is-20-70 dB. In a gain range of-20-25 dB, parameters distributed to the first-stage programmable power amplifier are 0 all the time, and parameters distributed to the second-stage programmable power amplifier are 0-F; in a gain range of 28-70 dB, a parameter which is always distributed to the first-stage programmable power amplifier is F, and a parameter which is distributed to the second-stage programmable power amplifier is 0-F.
The present invention has been described through the above embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (13)
1. An automatic gain control device with a two-stage programmable power amplifier (PGA) applied to broadband power line carrier communication (PLC), which is characterized in that a specific data processing flow comprises:
(1) receiving a carrier signal from a power line, and amplifying or reducing the signal through a two-stage programmable power amplifier;
(2) converting the amplified or reduced signal into a digital signal by using a digital-to-analog converter;
(3) evaluating the amplitude intensity of the received power line carrier signal by using the digital signal, mainly comparing the difference with the amplitude of an expected signal;
(4) and converting the difference into gain, and configuring a two-stage programming power amplifier according to the gain distribution method, so that the two-stage power amplifier can complete the adjustment of the target gain.
2. The process of claim 1, wherein the two-stage programmable power amplifier, the digital-to-analog converter, the amplitude balancer and the gain converter are connected in series. And the output of the gain converter is used for controlling the amplification amplitude of the programmable power amplifier.
3. The process of claim 1, wherein the gain range of each programmable power amplifier is-10 to 35dB, the step gain is 3dB, the bit width of the control signal is 4 bits, and the 16-ary 0 to F corresponds to-10 to 35 dB.
4. The process of claim 1 wherein the programmable power amplifier is an AD 8369.
5. The process of claim 1, wherein the two programmable power amplifiers are connected in a cascade manner, that is, a first stage of programmable power amplifier first amplifies or reduces the carrier signal on the power line, and the amplified or reduced carrier signal passes through a second season programmable power amplifier for a second amplification or reduction.
6. The process of claim 1, wherein the input range of the analog-to-digital converter is-1V to 1V, and the sampling frequency is 25 MHz.
7. The process of claim 1, wherein the digital-to-analog converter converts the power line carrier signal amplified or reduced by the programmable power amplifier into a digital signal.
8. The process of claim 1, wherein the amplitude measurement is based on a digital signal generated by the dac, and is used to measure the amplitude of the current power line carrier signal, and compare the measured amplitude with a desired amplitude to generate the currently required gain.
9. The method of claim 8, wherein the amplitude measure is obtained by counting an average power of the digital signal after the digital-to-analog conversion circuit, and the counting time is a length of a plurality of OFDM symbols.
10. The method of claim 8, wherein the desired amplitude is set based on an average of a plurality of full-amplitude OFDM symbol powers.
11. The process of claim 1 wherein the gain converter distributes the gain to the two programmable power amplifiers based on the gain generated by the amplitude converter and based on a gain combiner table.
12. The method of claim 11 wherein the gain converter calculates a ratio of the result produced by the amplitude balancer to the desired amplitude value and quantizes the ratio 3dB apart by the gain value.
13. The method of claim 11, wherein the gain allocation method comprises: the gain range that can be allocated is-20 to 70 dB. In a gain range of-20-25 dB, parameters distributed to the first-stage programmable power amplifier are 0 all the time, and parameters distributed to the second-stage programmable power amplifier are 0-F; in a gain range of 28-70 dB, a parameter which is always distributed to the first-stage programmable power amplifier is F, and a parameter which is distributed to the second-stage programmable power amplifier is 0-F.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910798815.1A CN111600563A (en) | 2019-08-28 | 2019-08-28 | Gain control device for two-stage programmable amplifier for power line communication |
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| CN201910798815.1A CN111600563A (en) | 2019-08-28 | 2019-08-28 | Gain control device for two-stage programmable amplifier for power line communication |
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| CN201910798815.1A Withdrawn CN111600563A (en) | 2019-08-28 | 2019-08-28 | Gain control device for two-stage programmable amplifier for power line communication |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102571152A (en) * | 2012-03-02 | 2012-07-11 | 钜泉光电科技(上海)股份有限公司 | Control device of transmitted power of power line carrier communication |
| CN103220018A (en) * | 2013-03-19 | 2013-07-24 | 北京中宸泓昌科技有限公司 | Control method of automatic gain in power line carrier communication network |
| CN103248382A (en) * | 2013-05-17 | 2013-08-14 | 北京华强智连微电子有限责任公司 | Analog front-end circuit of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication receiver |
| CN103607218A (en) * | 2013-10-28 | 2014-02-26 | 国家电网公司 | Cross-frequency-band power-line carrier communication system and communication method thereof |
| 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 |
| 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 |
-
2019
- 2019-08-28 CN CN201910798815.1A patent/CN111600563A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102571152A (en) * | 2012-03-02 | 2012-07-11 | 钜泉光电科技(上海)股份有限公司 | Control device of transmitted power of power line carrier communication |
| CN103220018A (en) * | 2013-03-19 | 2013-07-24 | 北京中宸泓昌科技有限公司 | Control method of automatic gain in power line carrier communication network |
| CN103248382A (en) * | 2013-05-17 | 2013-08-14 | 北京华强智连微电子有限责任公司 | Analog front-end circuit of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication receiver |
| CN103607218A (en) * | 2013-10-28 | 2014-02-26 | 国家电网公司 | Cross-frequency-band power-line carrier communication system and communication method thereof |
| 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 |
| 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 |
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