CN105337917A - Gain compensation technology for orthogonal frequency division multiplexing (OFDM) power line carrier communication chip - Google Patents
Gain compensation technology for orthogonal frequency division multiplexing (OFDM) power line carrier communication chip Download PDFInfo
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- CN105337917A CN105337917A CN201410382969.XA CN201410382969A CN105337917A CN 105337917 A CN105337917 A CN 105337917A CN 201410382969 A CN201410382969 A CN 201410382969A CN 105337917 A CN105337917 A CN 105337917A
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Abstract
The invention discloses a gain compensation technology for an orthogonal frequency division multiplexing (OFDM) power line carrier communication chip. The technology mainly includes a frequency-dependent gain compensation circuit, a signal power detection circuit, and gain compensation approximation logic, and also needs an automatic gain amplifier of a chip receiving channel, a band-pass filter, a controllable gain amplifier and an analog-digital converter. For the characteristic that the higher the frequency is, the further the power line channel attenuates the signal, the technology can compensate the signal gain in the chip receiving channel, so as to eliminate the impact of the characteristic on communication performance. The frequency-dependent gain compensation circuit is realized through an analog circuit and can generate gain compensation curves of different frequency-dependent characteristics according to demands. The signal power detection circuit and the gain compensation approximation logic are realized through a digital circuit, and are used for controlling the frequency-dependent gain compensation circuit to generate an appropriate gain compensation curve.
Description
Technical field
The present invention carries the communication technology about power line, especially frequently becomes compensation method about electric-power wire communication signal decay, specifically be a kind of gain compensation technology for OFDM power line carrier communication chip.
Background technology
Power line carrier communication (PLC, PowerLineCarrier) is a kind of specific communication mode utilizing power line transmission data.Different from common dedicated communication line, when power line is as data transmission medium, there is many unpredictable Noise and Interferences; On the impact of digital power line carrier communication mainly: interchannel noise, fading channel and multipath effect.Employing OFDM multi-transceiver technology effectively can overcome the intersymbol interference that multipath effect causes, and also have good solution to impedance variation, effectively can improve signal transmission rate, be the very attractive power-line carrier communication of one simultaneously.
The signal of OFDM multi-transceiver technology has certain frequency bandwidth, and power line is not identical for the decay of different carrier frequencies, and in general, carrier frequency is higher, decays more serious.This feature of power line can have influence on signal transmission rate and the distance of OFDM carrier communication.Usually, the bandwidth of OFDM carrier communication is larger, and the impact be subject to is also larger, so just limits the speed advantage of OFDM carrier communication.
summary of the invention
The invention discloses a kind of gain compensation technology for OFDM power line carrier communication chip, for the fading channel characteristic of power line to signal, invent a kind of frequency variable gain compensation method.This frequency variable gain compensation method integration is in described OFDM power line carrier communication chip, core circuit comprises variable gain compensation circuit frequently, signal power testing circuit, gain compensation approaches logic, also need to use the existing automatic gain amplifier of OFDM chip simultaneously, band pass filter, controllable gain amplifier, analog to digital converter.
Further, described frequency variable gain compensation circuit analog circuit realizes, and is integrated in described ofdm communication chip receiving path, and input connects the band pass filter output of ofdm communication chip, exports the controllable gain amplifier input connecting ofdm communication chip.Frequently variable gain compensation circuit is a kind of controlled circuit, can produce the frequency variable gain compensation curve of Different Slope according to control signal.
Further, described signal power testing circuit digital circuit, is integrated in described ofdm communication chip digital circuit, and input connects the ADC input of ofdm communication chip, exports connection gain compensation and approaches logic.Signal power testing circuit can detect the signal power of different frequency in signal of communication bandwidth, and testing result is delivered to gain compensation approaches logic.
Further, described gain compensation approaches logic digital circuit, is integrated in described ofdm communication chip digital circuit, and input connection signal power-sensing circuit, exports the control end connecting variable gain compensation circuit frequently.Gain compensation approaches the testing result of the logical root number of it is believed that power-sensing circuit, controls the change direction of variable gain compensation circuit gain compensated curve frequently, until obtain gain compensation effect the most suitable.
Gain compensation technology of the present invention, specific works process is as follows with requirement:
Before valid data, send calibration data bag during chip communication, the signal frequency of calibration data bag contains communication band really, and signal power is not with frequency change.Calibrating signal through the decay of power line channel, can present frequency in the front end of receiving chip higher, the characteristic that signal power is less.Described signal power testing circuit and gain compensation approach the compensated curve that logic can adjust variable gain compensation circuit frequently, until the signal that chip digital circuit obtains is identical at whole frequency band internal power, now circuit calibrates is complete, frequently variable gain compensation circuit provides compensated curve the most suitable, and communication performance is improved.
Accompanying drawing explanation
Fig. 1 is the system block diagram of the gain compensation technology for OFDM power line carrier communication chip of the present invention, which includes the receiving path of ofdm communication chip;
Fig. 2 is the signal attenuation schematic diagram of power line communication channel;
Fig. 3 is the frequency variable gain compensation curve of frequency variable gain compensation device of the present invention;
Fig. 4 is the circuit realiration of frequency variable gain compensation device of the present invention;
Fig. 5 is the automatic calibration process of frequency variable gain compensation technology of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The systematic schematic diagram of the gain compensation technology for OFDM power line carrier communication chip provided by the present invention as shown in Figure 1, comprise the core circuit module of gain compensation technology and the Signal reception path of ofdm communication chip, the core circuit of in fact described gain compensation technology is a part for chip signal receiving path, there is relatively independent function, but the course of work needs whole receiving path collaborative work.
As shown in Figure 1, the core circuit module of described gain compensation technology comprises variable gain compensation device 03 frequently, and signal power testing circuit 07, gain compensation approaches logical zero 8.Described ofdm communication chip receiving path other circuit comprise automatic gain amplifier (AGC) 01, band pass filter (BPF) 02, controllable gain amplifier (PGA) 04, analog to digital converter (ADC) 05, other digital circuits 06.
The Signal reception process of described ofdm communication chip is as follows: first signal enters into AGC and carry out pre-amplification, then BPF elimination out of band signal is delivered to, then deliver in frequency variable gain compensation device and carry out gain compensation, then deliver to PGA and carry out signal amplification, then deliver in ADC and be converted to digital signal, digital signal is admitted in digital circuit carries out various process.The calibration process of described gain compensation technology also depends on above-mentioned Signal reception process, unlike the testing result needed during calibration according to signal power testing circuit, adjusted, until obtain compensated curve the most suitable by the compensated curve of gain compensation logic to frequency variable gain compensation device.
Fig. 2 is the attenuation characteristic of power line communication channel to different frequency signals, has frequency higher, the characteristic that signal attenuation is larger.As shown in Figure 2, the signal frequency range of ofdm communication chip is f1 to f2, and what power line communication channel went out frequency f 1 decays to A1, decays to A2, wherein A1<A2 to frequency f 2 place.In general, in order to ensure the reliability and stability communicated, the distance of f1 and f2 is unsuitable excessive, and now power line channel is approximately linear to the signal attenuation characteristic in f1 to f2 frequency range.This has certain directive significance to the compensated curve characteristic of the frequency variable gain compensation device designed by the present invention.
The compensated curve of described frequency variable gain compensation device as shown in Figure 3.Frequency variable gain compensation utensil designed by the present invention has adjustable function, can provide the frequency weighting curve that gang's slope is different.This race's compensated curve has following features: have identical compensating gain G1 at frequency f 1 place, is respectively G1, G2 in its gain of frequency f 2 place ... Gn, and meet following two constraints:
G1<G2<…<Gn(1)
Gn-G1>A2-A1(2)
Constraint (1) ensure that variable-gain gain compensator can produce the gain compensating curve of gang's Different Slope frequently, and the slope of Article 1 compensated curve is minimum is zero, does not namely afford redress; Article n-th, the slope of compensated curve is maximum, can provide maximum compensation.It is poor that constraint (2) ensure that the maximum compensation range of this gang's compensated curve is greater than the decay of power line communication channel to signal, thus ensure to there will not be under-compensated situation.
The circuit realiration of described frequency variable gain compensation device is as Fig. 4.Circuit comprises two operational amplifier OPA1 and OPA2, four resistance R1, R2, R3, R4, four electric capacity C1, C2, C3, C4.Wherein resistance R3 is adjustable resistance, electric capacity C1, and C2, C3 are tunable capacitors.Above-mentioned OPA1, R1, R2, C1, C2, C3 entirety constitutes the adjustable compensated curve of slope and produces circuit.Tunable capacitor C1, C2, C3, for adjusting the slope of compensated curve, namely adjust Gi-G1 (i=2,3 ... n) size.OPA1, R3, R4, C4 constitute entire gain Circuit tuning jointly, and variable resistor R3, for adjusting the entire gain level of compensated curve, namely adjusts the size of G1.By control C1, C2, C3 and R3, any one among the compensated curve that can realize described gang's Different Slope.
The control signal of the circuit of described frequency variable gain compensation device is approached logic by described signal power testing circuit and gain compensation just and has been come.The decision process of control signal is a calibration process, and whole process is as shown in Figure 5, as follows in detail:
The first step, chip receives calibrating signal bag, starts to do calibration operation, and whole calibration process chips can continue to receive calibration ofdm signal.
Second step, variable gain compensation device acquiescence provides gain compensating curve G1-G1 frequently, and namely in curve shown in Fig. 3, frequency f 1 compensating gain is G1, and frequency f 2 compensating gain is the curve of G1.
3rd step, signal power testing circuit detects the signal strength signal intensity S1 at frequency f 1, f2 place, S2, and testing result is delivered to gain compensation approaches logic.
4th step, gain compensation approach Logic judgment frequently the control signal of variable gain compensation curve make and how to change, if S1>S2, so gain compensation approaches the control signal that logic provides G1-G2 compensated curve.
5th step, repeat third and fourth step process, until the signal strength signal intensity S1 that signal power testing circuit detects, S2 equal till, the compensated curve of this time-frequency variable gain compensation device is most suitable, namely completes calibration process.
Finally should be noted that: above embodiment is closely in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. the gain compensation technology for OFDM power line carrier communication chip, described technology comprises variable gain compensation circuit frequently, signal power testing circuit, gain compensation approaches logic, also need the automatic gain amplifier using chip receiving path simultaneously, band pass filter, controllable gain amplifier, analog to digital converter.
2. gain compensation Integration ofTechnology described in, in the Signal reception path of OFDM chip, can regard a part for OFDM chip signal receiving path as.
3. the gain compensation technology of OFDM power line carrier communication chip as claimed in claim 1, it is characterized in that, the core of technology is frequency variable gain compensation circuit, signal power testing circuit and gain compensation approach logic, and described frequency variable gain compensation circuit is for generation of the gain compensating curve of different frequency dependent characteristic; Described signal power testing circuit for detecting the size of different frequency place signal power, and is given gain compensation testing result and is approached logic; Described gain compensation approaches logic, according to the testing result obtained from signal power testing circuit, controls frequency gain compensating circuit, obtains more suitable gain compensating curve to adjust.
4. the gain compensation technology of OFDM power line carrier communication chip as claimed in claim 1, it is characterized in that, the receiving path that the adjustment process of gain compensating curve needs power line carrier communication chip to exist, comprise automatic gain amplifier, band pass filter, controllable gain amplifier, analog to digital converter.
5. the gain compensation technology of OFDM electric power line carrier chip as claimed in claim 1, is characterized in that, variable gain compensation circuit analog circuit realizes frequently, and main circuit will comprise operational amplifier, resistance, electric capacity, adjustable resistance, tunable capacitor.
6. operational amplifier described in, resistance, electric capacity is for generation of frequency variable gain compensation curve; Described adjustable resistance is for adjusting the entire gain level of variable gain compensation circuit frequently; Described tunable capacitor is for adjusting the slope of gain compensating curve.
7. the gain compensation technology of OFDM electric power line carrier chip as claimed in claim 1, it is characterized in that signal power testing circuit digital circuit, the input signal of signal power testing circuit is from the analog to digital converter of electric power line carrier chip, signal power testing circuit detects the signal power size at whole signal band different frequency place, and testing result is delivered to gain compensation approaches logic.
8. the gain compensation technology of OFDM electric power line carrier chip as claimed in claim 1, it is characterized in that gain compensation approaches logic digital circuit, gain compensation approaches the testing result of the logical root number of it is believed that power-sensing circuit, make decision and the gain compensating curve of frequency variable gain compensation circuit adjusted, to reach best compensation effect.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106301616A (en) * | 2016-08-12 | 2017-01-04 | 矽力杰半导体技术(杭州)有限公司 | The acquisition methods of received signal strength indicator and device |
| 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 |
| CN110739985A (en) * | 2018-11-16 | 2020-01-31 | 北京世纪德晋电力科技有限公司 | HPLC high-speed power line carrier gain automatic adjustment technology |
| 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 |
| CN112383432A (en) * | 2020-11-13 | 2021-02-19 | 北京神经元网络技术有限公司 | OFDM-based high-speed industrial communication system |
| CN112383464A (en) * | 2020-11-13 | 2021-02-19 | 北京神经元网络技术有限公司 | High-speed industrial communication system and node circuit thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110739985A (en) * | 2018-11-16 | 2020-01-31 | 北京世纪德晋电力科技有限公司 | HPLC high-speed power line carrier gain automatic adjustment technology |
| 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 |
| CN112383432A (en) * | 2020-11-13 | 2021-02-19 | 北京神经元网络技术有限公司 | OFDM-based high-speed industrial communication system |
| CN112383464A (en) * | 2020-11-13 | 2021-02-19 | 北京神经元网络技术有限公司 | High-speed industrial communication system and node circuit thereof |
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