CN102195675A - Carrier sensing method and circuit as well as microcontroller - Google Patents
Carrier sensing method and circuit as well as microcontroller Download PDFInfo
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- CN102195675A CN102195675A CN2010101232027A CN201010123202A CN102195675A CN 102195675 A CN102195675 A CN 102195675A CN 2010101232027 A CN2010101232027 A CN 2010101232027A CN 201010123202 A CN201010123202 A CN 201010123202A CN 102195675 A CN102195675 A CN 102195675A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/407—Bus networks with decentralised control
- H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection (CSMA-CD)
Abstract
The invention provides a carrier sensing method and circuit as well as a microcontroller. The carrier sensing method comprises the following steps: carrying out analog amplification on a received analog signal; carrying out analog-to-digital (A/D) conversion on the amplified analog signal to generate a digital signal; demodulating the digital signal to generate a demodulated signal; calculating an energy value of the demodulated signal according to an amplitude value of the demodulated signal; determining a gain multiplication factor according to the energy value and a preset energy range of the demodulated signal; and controlling an amplification factor in the case of analog amplification on the received analog signal according to the gain multiplication factor. By utilizing the carrier sensing method and circuit as well as the microcontroller, the power line carrier signal with smaller energy can be sensed, thus expanding application environments.
Description
Technical field
The embodiment of the invention relates to the power line communication field, relates in particular to carrier sensing method, circuit and microcontroller in the power line communication.
Background technology
(Carrier Sense Multiple Access, be called for short: CSMA) technology is by intercepting carrier wave, to pass signals from collision and collision between the node of avoiding existing mutually for Carrier Sense Multiple Access in the power line communication.
Existing a kind of CSMA implementation is by before certain node sends signal, at first intercept channel, if channel idle, then this node generates a random delay time according to the prediction of current network load, if channel is still idle when this random delay time finishes, then this node sends packet.This scheme needs complicated software algorithm and a large amount of hardware costs, makes product cost improve; And, make the stand-by period very long along with increasing considerably of number of nodes in the network.
In addition, because the decay of power line communication is very big, simultaneously the input carrier signal energy can not be set, therefore be not suitable for the less carrier wave of energy, and in power line carrier is checked meter application, the voltage of signals of checking meter is lower usually, so carrier energy is also lower, is difficult to realize by existing manner accurate carrier sense.
Summary of the invention
The embodiment of the invention provides a kind of carrier sensing method, circuit and microcontroller, intercepts in order to realize power line carrier.
The embodiment of the invention provides a kind of carrier sensing method, comprising:
The analog signal that receives is simulated amplification;
Amplified analog signal is carried out analog-to-digital conversion generate digital signal;
Described digital signal is carried out demodulation generating solution tonal signal;
Calculate the energy value of described restituted signal according to the range value of described restituted signal;
Energy value and default energy range according to described restituted signal are determined the gain multiple;
Multiplication factor when the described analog signal that receives being simulated amplification according to described gain multiple control.
The embodiment of the invention provides a kind of carrier sense circuit, comprising:
Analogue amplifier is used for the analog signal that receives is simulated amplification;
Analog to digital converter is used for that the analogue amplifier amplified analog signal is carried out analog-to-digital conversion and generates digital signal;
Digital demodulator is used for the described digital signal that analog to digital converter generates is carried out demodulation generating solution tonal signal;
The signal energy processor, the range value that is used for the described restituted signal that generates according to digital demodulator calculates the energy value of described restituted signal;
Gain controller, the energy value and the default energy range that are used for the described restituted signal that calculates according to the signal energy processor are determined the gain multiple, and control the multiplication factor of described analogue amplifier according to described gain multiple.
The embodiment of the invention provides a kind of microcontroller, comprising above-mentioned carrier sense circuit.
The embodiment of the invention is determined the gain multiple according to the energy value and the default energy range of restituted signal, and the described analog signal that receives is simulated multiplication factor when amplifying according to the control of described gain multiple, make when carrying out carrier sense, the energy value of the analog signal that is detected is in the suitable energy range, thereby also can realize intercepting to the less power line carrier signal of energy, expanded applied environment, and the number of nodes of intercepting in process and the network is irrelevant, software algorithm is simple, and hardware cost is low.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of carrier sensing method embodiment one of the present invention;
Fig. 2 is the flow chart of carrier sensing method embodiment two of the present invention;
Fig. 3 is the flow chart of carrier sensing method embodiment three of the present invention;
Fig. 4 is the structural representation of carrier sense circuit embodiments one of the present invention;
Fig. 5 is the structural representation of carrier sense circuit embodiments two of the present invention;
Fig. 6 is the structural representation of carrier sense circuit embodiments three of the present invention;
Fig. 7 is the structural representation of carrier sense circuit embodiments four of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is the flow chart of carrier sensing method embodiment one of the present invention, and as shown in the figure, this method comprises the steps:
Wherein, this analog signal might be the power line carrier signal that is of practical significance, and also might be the noise signal that produces on the power line.For example, the switch of refrigerator doors or the operations such as startup of television set all can produce noise on power line, thereby influence is to the power line carrier signal judgment.
Alternatively, before carrying out analog-to-digital conversion, can carry out analog filtering to described amplified analog signal earlier,, further reduce noise jamming with the filtering out-of-band noise.
Particularly, can adopt corresponding demodulation mode according to the modulation system that signalling adopted, as: frequency shift keying (Frequency Shift Key, be called for short: FSK) or phase shift keying (Phase Shift Key is called for short: PSK).
Particularly, can be by modes such as calculus area summations by range value calculating energy value.
Wherein, described default energy range is to determine according to the energy of possible noise signal and power line carrier signal, if the energy value of the described restituted signal that calculates in step 104 not in this default energy range, illustrates that then this energy value is excessive or too small.
The described method of present embodiment is determined the gain multiple by energy value and default energy range according to restituted signal, multiplication factor when the described analog signal that receives being simulated amplification according to described gain multiple control, make when carrying out carrier sense, the energy value of the analog signal that is detected is in the suitable energy range, thereby also can realize intercepting to the less power line carrier signal of energy, expanded applied environment, and the number of nodes of intercepting in process and the network is irrelevant, software algorithm is simple, and hardware cost is low.
Fig. 2 is the flow chart of carrier sensing method embodiment two of the present invention, and as shown in the figure, this method further comprises the steps: after the step 104 of said method embodiment one
Step 201 compares the energy value and the default energy threshold value of described restituted signal.
Step 202 when the energy value of described restituted signal during more than or equal to described default energy threshold value, determines that described analog signal is the power line carrier signal.
Wherein, default energy threshold value is to determine that according to the power line carrier signal in the known communication protocol that adopts having only the energy value of restituted signal just might be the power line carrier signal more than or equal to this default energy threshold value.
The described method of present embodiment determines by the energy value of restituted signal whether the analog signal that receives has realized power line carrier for the power line carrier signal and intercepted, because it is irrelevant with the communication protocol that adopts, therefore be applicable to multiple modulation systems such as FSK and PSK, and also need not to set condition code, software algorithm is simple, and hardware cost is low.Need to prove there is not inevitable execution sequence relation between step 201 in the present embodiment and step 202 and step 105 and the step 106 in addition.
Fig. 3 is the flow chart of carrier sensing method embodiment three of the present invention, and as shown in the figure, this method further comprises the steps: after the step 104 of said method embodiment one
Particularly, the comparative result that obtains after adopting the mode of logic level to represent relatively for example, when the energy value that compares restituted signal during more than or equal to default energy threshold value, is exported high level; Otherwise output low level.
Particularly, can follow the tracks of the duration of described high level.
Though because some in-band noise energy value is higher, the duration changes short, therefore, can further distinguish in-band noise and power line carrier signal by following the tracks of the duration.
The described method of present embodiment was followed the tracks of by the duration to the energy value of restituted signal, can reduce that the burst noise erroneous judgement is the probability of power line carrier signal in the band that the duration is short, thereby further improved the accuracy of carrier sense.
Need to prove there is not inevitable execution sequence relation between the step 301 in the present embodiment, step 302 and step 303 and step 105 and the step 106 in addition.
Fig. 4 is the structural representation of carrier sense circuit embodiments one of the present invention, as shown in the figure, this patent comprises: analogue amplifier 11, analog to digital converter (Analog to Digital Converter, be called for short: ADC) 12, digital demodulator 13, signal energy processor 14 and gain controller 15, its operation principle is as follows:
The described circuit of present embodiment is determined the gain multiple by gain controller 15 according to the energy value and the default energy range of restituted signal, and analogue amplifier 11 is simulated multiplication factor when amplifying according to the control of described gain multiple, make when carrying out carrier sense, the energy value of the analog signal that is detected is in the suitable energy range, thereby also can realize intercepting to the less power line carrier signal of energy, expanded applied environment, and the number of nodes of intercepting in process and the network is irrelevant, software algorithm is simple, and hardware cost is low.
Fig. 5 is the structural representation of carrier sense circuit embodiments two of the present invention, and as shown in the figure, the described circuit of present embodiment has increased signal energy comparator 16 and central processing unit 17 on the basis of foregoing circuit embodiment one, and its operation principle is as follows:
In foregoing circuit embodiment one, the range value of the described restituted signal that signal energy processor 14 generates according to digital demodulator 13 calculates after the energy value of described restituted signal, and signal energy comparator 16 compares the energy value and the default energy threshold value of the described restituted signal that signal energy processor 14 calculates; Central processing unit 17 is according to the comparative result of described signal energy comparator 16, when the energy value of described restituted signal during more than or equal to described default energy threshold value, determines that described analog signal is the power line carrier signal.
The described circuit of present embodiment determines by the energy value of restituted signal whether the analog signal that receives is the power line carrier signal, because it is irrelevant with the communication protocol that adopts, therefore be applicable to multiple modulation systems such as FSK and PSK, and also need not to set condition code, software algorithm is simple, and hardware cost is low.
Fig. 6 is the structural representation of carrier sense circuit embodiments three of the present invention, and as shown in the figure, the described circuit of present embodiment has increased signal energy tracker 18 on the basis of foregoing circuit embodiment two, and its operation principle is as follows:
After the energy value of the described restituted signal that the signal energy comparator 16 described in the foregoing circuit embodiment two calculates signal energy processor 14 and default energy threshold value compare, the duration of the energy value of the described restituted signal that signal energy tracker 18 tracking signal energy processor 14 calculate.Described central processing unit 17 is according to the tracking results of the comparative result and the described signal energy tracker 18 of described signal energy comparator 16, when the energy value of described restituted signal during more than or equal to the Preset Time threshold value, determines that described analog signal is the power line carrier signal more than or equal to described default energy threshold value and described duration.
The described circuit of present embodiment was followed the tracks of by the duration to the energy value of restituted signal, can reduce that the burst noise erroneous judgement is the probability of power line carrier signal in the band that the duration is short, thereby further improved the accuracy of carrier sense.
Fig. 7 is the structural representation of carrier sense circuit embodiments four of the present invention, the described circuit of present embodiment has increased receiving filter 19 on the basis of above-mentioned each circuit embodiments, be connected between analog to digital converter 12 and the analogue amplifier 11, be used for described analogue amplifier 11 amplified analog signal are carried out analog filtering, simulate noise outward with the filtering band, further reduce noise jamming.
In addition, in order to realize demodulation, can further include in the above-mentioned carrier sense circuit: digital mixer 21 and digital filter 22.Wherein: digital mixer 21, be used for the digital carrier signal and the local carrier signal of analog to digital converter 12 outputs are carried out mixing, form the intermediate-freuqncy signal that meets back stages of digital filter 22 parameter characteristics; Digital filter 22 is connected between digital mixer 21 and the digital demodulator 13, is used for the outer digital noise of filtering band.Wherein, this digital filter 22 can be band pass filter.
In addition, as shown in Figure 7, in the carrier sense process, signal energy processor 14 can also send to central processing unit 17 with the energy value of the described restituted signal that calculates; Digital demodulator 13 can also send to the restituted signal that obtains central processing unit 17.Make central processing unit 17 operating state of pilot signal energy processor 14 and digital demodulator 13 at any time, and in time obtain the restituted signal and the energy value thereof that listen to.
In addition, the described carrier sense circuit of the various embodiments described above can be integrated in and form microcontroller in the chip, so that reduce peripheral circuit and complexity, reduces development cost.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. a carrier sensing method is characterized in that, comprising:
The analog signal that receives is simulated amplification;
Amplified analog signal is carried out analog-to-digital conversion generate digital signal;
Described digital signal is carried out demodulation generating solution tonal signal;
Calculate the energy value of described restituted signal according to the range value of described restituted signal;
Energy value and default energy range according to described restituted signal are determined the gain multiple;
Multiplication factor when the described analog signal that receives being simulated amplification according to described gain multiple control.
2. carrier sensing method according to claim 1 is characterized in that, the energy value that calculates described restituted signal also comprises afterwards:
The energy value and the default energy threshold value of described restituted signal are compared,, determine that described analog signal is the power line carrier signal when the energy value of described restituted signal during more than or equal to described default energy threshold value.
3. carrier sensing method according to claim 2 is characterized in that, also comprises after the energy value of described restituted signal and default energy threshold value are compared:
The duration of the described comparative result that obtains after is relatively carried out in tracking, when the energy value of described restituted signal during more than or equal to the Preset Time threshold value, determines that described analog signal is the power line carrier signal more than or equal to described default energy threshold value and described duration of tracing into.
4. according to arbitrary described carrier sensing method in the claim 1～3, it is characterized in that described simulate amplify after and described carrying out also comprise before the analog-to-digital conversion: described amplified analog signal is carried out analog filtering.
5. carrier sense circuit is characterized in that comprising:
Analogue amplifier is used for the analog signal that receives is simulated amplification;
Analog to digital converter is used for that the analogue amplifier amplified analog signal is carried out analog-to-digital conversion and generates digital signal;
Digital demodulator is used for the described digital signal that analog to digital converter generates is carried out demodulation generating solution tonal signal;
The signal energy processor, the range value that is used for the described restituted signal that generates according to digital demodulator calculates the energy value of described restituted signal;
Gain controller, the energy value and the default energy range that are used for the described restituted signal that calculates according to the signal energy processor are determined the gain multiple, and control the multiplication factor of described analogue amplifier according to described gain multiple.
6. carrier sense circuit according to claim 5 is characterized in that also comprising:
The signal energy comparator, the energy value and the default energy threshold value that are used for described restituted signal that the signal energy processor is calculated compare;
Central processing unit is used for the comparative result according to described signal energy comparator, when the energy value of described restituted signal during more than or equal to described default energy threshold value, determines that described analog signal is the power line carrier signal.
7. carrier sense circuit according to claim 6 is characterized in that also comprising:
The signal energy tracker is used for the duration that tracking signal energy comparator carries out the described comparative result that obtains after relatively;
Described central processing unit also is used for the tracking results according to the comparative result of described signal energy comparator and described signal energy tracker, when the energy value of described restituted signal during more than or equal to the Preset Time threshold value, determines that described analog signal is the power line carrier signal more than or equal to described default energy threshold value and described duration.
8. arbitrary described carrier sense circuit in the claim 5～6 is characterized in that, also comprises: receiving filter is used for described analogue amplifier amplified analog signal is carried out analog filtering.
9. a microcontroller is characterized in that, comprises arbitrary described carrier sense circuit in the claim 5～8.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010123202.7A CN102195675B (en) | 2010-03-10 | 2010-03-10 | Carrier sensing method, circuit and microcontroller |
| PCT/CN2010/073506 WO2011109964A1 (en) | 2010-03-10 | 2010-06-03 | Method, circuit and microcontroller for carrier sense |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010123202.7A CN102195675B (en) | 2010-03-10 | 2010-03-10 | Carrier sensing method, circuit and microcontroller |
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| CN102195675A true CN102195675A (en) | 2011-09-21 |
| CN102195675B CN102195675B (en) | 2016-03-30 |
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| CN201010123202.7A Active CN102195675B (en) | 2010-03-10 | 2010-03-10 | Carrier sensing method, circuit and microcontroller |
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| WO (1) | WO2011109964A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107829A (en) * | 2011-11-09 | 2013-05-15 | 中国移动通信集团上海有限公司 | Opening and closing switching method and device of filtering device of power line communication system |
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| WO2008044307A1 (en) * | 2006-10-13 | 2008-04-17 | Panasonic Corporation | Radio signal receiving device |
| CN101394200A (en) * | 2008-11-11 | 2009-03-25 | 国网电力科学研究院 | Zero frequency conversion and adaptive frequency selecting power line carrier data transmission method |
| CN101621312A (en) * | 2009-07-29 | 2010-01-06 | 昆明天龙经纬电子科技有限公司 | Power line carrier communication chip established by utilizing singlechip |
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2010
- 2010-03-10 CN CN201010123202.7A patent/CN102195675B/en active Active
- 2010-06-03 WO PCT/CN2010/073506 patent/WO2011109964A1/en active Application Filing
Patent Citations (6)
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| CN1171669A (en) * | 1996-07-22 | 1998-01-28 | 张会庭 | Digital multiplexing telophone channels over power transmission line and integrated information transmission system |
| US5917372A (en) * | 1996-08-23 | 1999-06-29 | Nec Corporation | Automatic gain control circuit |
| CN1819452A (en) * | 2006-03-30 | 2006-08-16 | 北京中星微电子有限公司 | Method and device for adjusting to adapt speech inputting distance |
| WO2008044307A1 (en) * | 2006-10-13 | 2008-04-17 | Panasonic Corporation | Radio signal receiving device |
| CN101394200A (en) * | 2008-11-11 | 2009-03-25 | 国网电力科学研究院 | Zero frequency conversion and adaptive frequency selecting power line carrier data transmission method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103107829A (en) * | 2011-11-09 | 2013-05-15 | 中国移动通信集团上海有限公司 | Opening and closing switching method and device of filtering device of power line communication system |
| CN103107829B (en) * | 2011-11-09 | 2014-12-10 | 中国移动通信集团上海有限公司 | Opening and closing switching method and device of filtering device of power line communication system |
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| Publication number | Publication date |
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| CN102195675B (en) | 2016-03-30 |
| WO2011109964A1 (en) | 2011-09-15 |
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Address after: 266023, a, Jia Lu, 16, Shandong, Qingdao Applicant after: Qingdao Eastsoft Communication Technology Co., Ltd. Applicant after: SHANGHAI EASTSOFT MICROELECTRONICS CO., LTD. Address before: 266023, a, Jia Lu, 16, Shandong, Qingdao Applicant before: Qingdao Eastsoft Communication Technology Co., Ltd. Applicant before: Shanghai Hair Group Integated Circuit Co., Ltd. |
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