CN103248382A - Analog front-end circuit of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication receiver - Google Patents
Analog front-end circuit of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication receiver Download PDFInfo
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- CN103248382A CN103248382A CN2013101836815A CN201310183681A CN103248382A CN 103248382 A CN103248382 A CN 103248382A CN 2013101836815 A CN2013101836815 A CN 2013101836815A CN 201310183681 A CN201310183681 A CN 201310183681A CN 103248382 A CN103248382 A CN 103248382A
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Abstract
The invention discloses an analog front-end circuit of an OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication receiver. The circuit comprises a first adjustable grain amplifying unit, a first energy detection unit, a first gain control unit, an adjustable band-pass filter unit, a second adjustable gain amplifying unit, a second energy detection unit, a second gain control unit and an analog-to-digital conversion unit. By using the first adjustable gain control unit and the second adjustable gain control unit, the gain range of the circuit is improved. The first energy detection unit and the second energy detection unit are adopted to respectively detect the output signals of the two adjustable gain control units, each node of a circuit is enabled not to be saturated under the existence of strong interference signals. The first gain control unit, the second gain control unit, the energy detection unit and the gain control unit respectively form closed loops and the stable speed of the circuit is improved.
Description
Technical field
The present invention relates to power line communication technology, particularly a kind of analog front circuit of OFDM power line carrier communication receiver.
Background technology
Power line communication is to utilize existing power line transmission data, especially utilize the low-voltage power line power distribution network to carry out carrier communication, with low cost, but compare with other communication modes, power line has a lot of characteristics as communication media: time variation is strong, the equiva lent impedance transformation range is big, and fading channel is big, and interference and noise are strong etc.
In power line carrier communication, disturb in order to obtain higher speed and anti-arrowband, adopt orthogonal frequency division multiplexi (OFDM).OFDM is divided into several parallel data streams to information, data is modulated on the mutually orthogonal single sub-carrier transmits then.OFDM has reduced intersymbol interference, has improved the availability of frequency spectrum, has effectively resisted the arrowband interference.
In the OFDM carrier communication system, because the distance between transmitting terminal and the receiving terminal is different, power line is different with amplitude to the frequency of the attenuation degree difference of signal, power line interference, therefore, need receiving terminal to have very low equivalent input noise, and can be rapidly according to the function of various interference adjustments signal magnitude, to guarantee in communication system, obtaining best receptivity.
Especially in the OFDM power-line carrier communication system, because there is serious uncertain and time variation in interference signal in frequency and amplitude, adopt traditional digital gain control mode, can't detection path inner each node, caused the analog channel of receiver all severe nonlinear distortion even saturated may take place at each node, worsen the problem of receptivity, therefore need one can fast and stable, and accurately control the gain control scheme of each node of analog channel, bring into play the optimum performance of receiver.
Summary of the invention
The present invention seeks to solve the OFDM technology in power line carrier communication, owing to the problem of power line to the decay of signal and the uncertain mis-behave that causes of interference existence, provide a kind of analog front circuit of OFDM power line carrier communication receiver.
Technical scheme of the present invention is as follows:
The invention discloses a kind of analog front circuit of OFDM power line carrier communication receiver.This circuit comprises: the first adjustable gain amplifying unit, first energy detection unit, first gain control unit, variable band-pass filter unit, the second adjustable gain amplifying unit, second energy detection unit, second gain control unit, AD conversion unit.The first adjustable gain amplifying unit is used for the pre-amplification of signal, promotes the signal to noise ratio of signal; First energy detection unit detects the signal energy value of first adjustable gain amplifying unit output; First gain control unit calculates rational yield value according to detected energy value, and feeds back to the first adjustable gain amplifying unit; The first adjustable gain amplifying unit is adjusted signal; The variable band-pass filter unit is used for signal amplification, interference attenuation; The second adjustable gain amplifying unit is amplified to signal the input reference signal of AD conversion unit; Second energy detection unit detects the signal energy value of second adjustable gain amplifying unit output; The second gain conversions unit calculates rational yield value according to detected energy value, and feeds back to the second adjustable gain amplifying unit; The second adjustable gain amplifying unit is adjusted signal; AD conversion unit is digital signal with analog signal conversion.
The described first adjustable gain amplifying unit is used for the pre-amplification of signal, and gain ranging is little, and equivalent input noise is low.
Described first energy detection unit is for detection of the output signal energy of the first adjustable gain amplifying unit.
Described first gain control unit is according to detected signal energy computation signal gain.
Described variable band-pass filter unit is used for amplifying signal, interference attenuation.
The described second adjustable gain amplifying unit, gain ranging is very big, is used for the amplification of signal.
Described second energy detection unit is for detection of the output signal energy of the second adjustable gain amplifying unit.
Described second gain control unit is according to detected signal energy computation signal gain.
Described AD conversion unit is digital signal with analog signal conversion.
Beneficial effect of the present invention
From technique scheme as can be seen, the present invention has following beneficial effect:
1. provided by the invention at first gain control unit, has very low equivalent input noise, and has an amount of gain, cooperate energy detection unit and gain control unit, constituted first local closed-loop control loop, both guaranteed the noise immunity of whole reception path, and prevented from again occurring under the strongly disturbing situation at power line that the node of first gain control unit output took place saturated and the problem deterioration receptivity.
2. variable band-pass filter provided by the invention unit, level is associated in after first gain control unit, decay, raising signal to noise ratio to interference signal on signal amplification, the power line, and for follow-up signal amplification provides assurance, can be suitable for different application requirements by regulating different frequency bands simultaneously.
3. second gain control unit provided by the invention, has very big gain, level is associated in after the variable band-pass filter unit, cooperate energy detection unit and gain control unit, constituted the closed-loop control loop of second part, both can fully amplify, effectively utilize the dynamic range of AD conversion unit to signal, and prevent from again occurring under the strongly disturbing situation at power line, the node of second gain control unit output takes place saturated and the problem deterioration receptivity.
4. two local closed-loop control loops of the present invention are parallel works alone, and has improved the stabilized speed of the analog front circuit of whole receiver.
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Fig. 1 is system block diagram of the invention process
Fig. 2 is the first adjustable gain amplifying unit of the invention process, the block diagram of energy detection unit and gain control unit
Fig. 3 is the block diagram of variable band-pass filter of the invention process unit
Fig. 4 is the second adjustable gain amplifying unit of the invention process, the block diagram of energy detection unit and gain control unit
Specific implementation method
Circuit block diagram of the invention process such as Fig. 1.Shown in the first adjustable gain amplifying unit, 101, the first energy detection unit, 102, the first gain control units 103, variable band-pass filter unit 104, the second adjustable gain amplifying units, 105, the second energy detection unit 106, second gain control unit 107, AD conversion unit 108.The output of the first adjustable gain amplifying unit 101 is connected with the input of first energy detection unit 102 and variable band-pass filter unit 104 respectively; The output of first energy detection unit 102 is connected with the input of first gain control unit 103; The output of first gain control unit 103 is connected with the gain control end of the first adjustable gain amplifying unit 101; The output of variable band-pass filter unit 104 is connected with the input of the first adjustable gain amplifying unit 105; The output of the second adjustable gain amplifying unit 105 is connected with the input of second energy detection unit 106 and AD conversion unit 108 respectively; The output of second energy detection unit 106 is connected with the input of second gain control unit 107; The output of second gain control unit 107 is connected with the gain control end of the second adjustable gain amplifying unit 105.
As Fig. 2, the first adjustable gain amplifying unit adopts resistance and amplifier OP1 to realize gain-adjusted, wherein input resistance R11 and R12 position fixed resistance value, resistance R 13 and R14 adopt the electric resistance array of 5 digit numeric codes control to realize, by regulating control A＜4:0〉can realize-10dB is to 21dB, step-length 1dB, totally 32 yield values, can realize the amplification of input signal and dwindle, wherein amplifier adopts the lower amplifier of equivalent input noise, guarantees the low-noise characteristic of the first adjustable gain amplifying unit integral body.
Because ofdm signal has bigger peak-to-average force ratio, therefore energy detection unit adopts the root mean square energy measuring shown in E1 among Fig. 2, namely to output signal square and integration, the signal energy value of Kai Pingfang result has avoided the peak value detection to wait other detection modes to detect its detected value problem of unstable of ofdm signal then.
Testing result is by being converted to the gain control code as the AD conversion unit ADC1 among Fig. 2, and the first adjustable gain amplifying unit increases according to the gain control code or reduces signal, and signal is adjusted to suitable target.Less when transmitter and receiver close together or power line decay, particularly exist under the very strongly disturbing situation at power line, reduce gain automatically, prevent the serious nonlinear distortion of the first adjustable gain amplifying unit output signal even saturated; When far away or power line decay is big when transmitter and receiver distance, increase gain, improve the signal to noise ratio of the first adjustable gain amplifying unit, promote the performance of whole reception path.
As Fig. 3, the variable band-pass filter unit adopts the structure of active RC filter, and wherein resistance and electric capacity adopt variable resistance and capacitor array, and the selection by frequency band adjustment unit realization different frequency bands signal can adapt to different application requirements.Under the situation that has the outer interference of very strong band, by reducing to be with outer interference signal, reduced the peak-to-peak value of signal, for the amplification of follow-up signal provides the space.
As Fig. 4, the second adjustable gain amplifying unit adopts resistance and amplifier OP2 to realize gain-adjusted, wherein input resistance R41 and R42 adopt the fixed resistance value, resistance R 43 and R44 adopt the electric resistance array of 6 digit numeric codes control to realize, by regulating control B＜5:0〉can realize that 0dB is to 63dB, step-length 1dB, totally 64 yield values, maximum can be amplified to several millivolts signal several volts, for high gain ranging like this, in order to prevent causing the circuit can't operate as normal as non-ideal factors such as imbalances, having added imbalance and having eliminated the unit.
As previously mentioned, for the good treatment ofdm signal, energy detection unit adopts the root mean square energy measuring, as the E2 among Fig. 4, testing result is by being converted to the gain control code as the AD conversion unit ADC2 among Fig. 4, the second adjustable gain amplifying unit is adjusted signal according to the gain control code, and signal is adjusted to the input reference signal that modulus changes the unit.When far away or power line decay is big when transmitter and receiver distance, increase gain, promote transmission range and the antidamping ability of receiver.Exist under the very strongly disturbing situation, reducing gain, preventing the serious nonlinear distortion of the second adjustable gain amplifying unit output signal even saturated, farthest bringing into play the performance that receives path.
Adopt the gain control mode of the local closed loop of two-stage, receiving circuit overall gain scope reached-and 10dB is to 84dB, total dynamic range up to 95dB is provided, can fully tackle power line high attenuation or long-distance transmissions, exist under the strongly disturbing situation at power line, guaranteed that serious nonlinear distortion even saturated does not take place each node of receiving circuit, also kept the excellent reception performance under the power line environment of various complexity simultaneously.The variable band-pass filter unit has promoted signal to noise ratio, by adjusting frequency band, adapts to different application requirements and frequency band requirement.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art can also find out many selections, combination, modifications and changes on the basis of above explanation.Therefore, the scope of the present invention should be listed as claims.
Claims (11)
1. the analog front circuit of an OFDM power line carrier communication receiver.
2. this circuit comprises: the first adjustable gain amplifying unit, first energy detection unit, first gain control unit, variable band-pass filter unit, the second adjustable gain amplifying unit, second energy detection unit, second gain control unit, AD conversion unit.
3. the first adjustable gain amplifying unit is used for the pre-amplification of signal, promotes the signal to noise ratio of signal; First energy detection unit detects the first adjustable gain amplifying unit signal energy value; The first gain conversions unit calculates rational yield value according to detected energy value, and feeds back to the first adjustable gain amplifying unit; The first adjustable gain amplifying unit is adjusted signal; The variable band-pass filter unit is used for signal amplification, interference attenuation; The second adjustable gain amplifying unit is amplified to signal the input reference signal of AD conversion unit; Second energy detection unit detects the second adjustable gain amplifying unit signal energy value; Second gain control unit calculates rational yield value according to detected energy value, and feeds back to the second adjustable gain amplifying unit; The second adjustable gain amplifying unit is adjusted signal; AD conversion unit is digital signal with analog signal conversion.
4. the first adjustable gain amplifying unit according to claim 1 is characterized in that: the described first adjustable gain amplifying unit, and gain ranging is little, and equivalent input noise is low, is used for the pre-amplification of signal.
5. first energy detection unit according to claim 1, it is characterized in that: described first energy detection unit is for detection of the output signal energy of the first adjustable gain amplifying unit.
6. first gain control unit as claimed in claim 1, it is characterized in that: described first gain control unit is according to detected signal energy computation signal gain.
7. variable band-pass filter unit according to claim 1, it is characterized in that: described variable band-pass filter unit is used for amplifying signal, interference attenuation.
8. the second adjustable gain amplifying unit according to claim 1, it is characterized in that: the described second adjustable gain amplifying unit, gain ranging is very big, is used for the amplification of signal.
9. second energy detection unit according to claim 1, it is characterized in that: described second energy detection unit is for detection of the output signal energy of the second adjustable gain amplifying unit.
10. second gain control unit as claimed in claim 1, it is characterized in that: described second gain control unit is according to detected signal energy computation signal gain.
11. AD conversion unit as claimed in claim 1 is characterized in that: described AD conversion unit is digital signal with analog signal conversion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101836815A CN103248382A (en) | 2013-05-17 | 2013-05-17 | Analog front-end circuit of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication receiver |
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| CN2013101836815A CN103248382A (en) | 2013-05-17 | 2013-05-17 | Analog front-end circuit of OFDM (Orthogonal Frequency Division Multiplexing) power line carrier communication receiver |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337623A (en) * | 2014-08-06 | 2016-02-17 | 南京能瑞自动化设备股份有限公司 | Analog front end circuit for orthogonal frequency division multiplexing (OFDM) carrier and Gaussian frequency shift keying (GFSK) wireless bimodule communication receivers |
| 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 |
| CN105900342A (en) * | 2013-10-17 | 2016-08-24 | 瑞典爱立信有限公司 | Method and apparatus for automatic gain control |
| CN106656086A (en) * | 2016-12-20 | 2017-05-10 | 北京中电华大电子设计有限责任公司 | Automatic gain amplifier circuit |
| 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 |
| CN112202472A (en) * | 2020-09-24 | 2021-01-08 | 中国建设银行股份有限公司 | Communication signal transmission method and device, electronic equipment and readable storage medium |
| CN112511178A (en) * | 2020-10-19 | 2021-03-16 | 河南智微电子有限公司 | Communication receiving module |
| CN114650075A (en) * | 2022-02-21 | 2022-06-21 | 南京英锐创电子科技有限公司 | Data transmitting/receiving system, data receiving apparatus, and control method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105900342A (en) * | 2013-10-17 | 2016-08-24 | 瑞典爱立信有限公司 | Method and apparatus for automatic gain control |
| CN105900342B (en) * | 2013-10-17 | 2019-07-19 | 瑞典爱立信有限公司 | Method and apparatus for automatic growth control |
| CN105337623A (en) * | 2014-08-06 | 2016-02-17 | 南京能瑞自动化设备股份有限公司 | Analog front end circuit for orthogonal frequency division multiplexing (OFDM) carrier and Gaussian frequency shift keying (GFSK) wireless bimodule communication receivers |
| 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 |
| CN106656086A (en) * | 2016-12-20 | 2017-05-10 | 北京中电华大电子设计有限责任公司 | Automatic gain amplifier circuit |
| CN106656086B (en) * | 2016-12-20 | 2019-05-03 | 北京中电华大电子设计有限责任公司 | A kind of automatic gain amplifier circuit |
| 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 |
| CN112202472A (en) * | 2020-09-24 | 2021-01-08 | 中国建设银行股份有限公司 | Communication signal transmission method and device, electronic equipment and readable storage medium |
| CN112511178A (en) * | 2020-10-19 | 2021-03-16 | 河南智微电子有限公司 | Communication receiving module |
| CN112511178B (en) * | 2020-10-19 | 2022-04-05 | 河南智微电子有限公司 | Communication receiving module |
| CN114650075A (en) * | 2022-02-21 | 2022-06-21 | 南京英锐创电子科技有限公司 | Data transmitting/receiving system, data receiving apparatus, and control method thereof |
| CN114650075B (en) * | 2022-02-21 | 2023-11-03 | 南京英锐创电子科技有限公司 | Data transmitting/receiving system, data receiving apparatus, and control method thereof |
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Application publication date: 20130814 |