CN101783780A - Method and device for controlling number of code element carriers in power carrier - Google Patents
Method and device for controlling number of code element carriers in power carrier Download PDFInfo
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- CN101783780A CN101783780A CN200910255796A CN200910255796A CN101783780A CN 101783780 A CN101783780 A CN 101783780A CN 200910255796 A CN200910255796 A CN 200910255796A CN 200910255796 A CN200910255796 A CN 200910255796A CN 101783780 A CN101783780 A CN 101783780A
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Abstract
The invention discloses a method for controlling the number of code element carriers in a power carrier, which comprises the following steps: determining the modulation ratio parameter according to the communication quality of a power line, generating a carrier cycle control signal according to the modulation ratio parameter, and controlling the number of carrier signal cycles occupied by code elements according to the carrier cycle control signal. Accordingly, the invention further discloses a modulator which comprises a determining unit, a generating unit and a controlling unit. As the number of the carrier cycles occupied by the single code element is related to the communication quality of the power line, the adoption of the modulation method with the variable number of the carriers occupied by the code elements can reduce the average occupied carrier cycles of the code elements and improve the transmission efficiency.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of modulator approach and equipment signal.
Background technology
Power line carrier communication typically refers to and utilizes high-voltage power line (being often referred to 35kV and above electric pressure in the power carrier field), medium voltage power line (referring to the 10kV electric pressure) or low-voltage distribution wire (380/220V) subscribers feeder to carry out a kind of specific communication mode of voice or transfer of data as information transmitting medium.In recent years, the high-voltage power line ZAP has entered digital times, and along with the continuous development and the needs of society of power line carrier technology, situation in the ascendant has also appearred in the technological development of low voltage electric power carrier communication and application.
Traditional power line carrier communication adopts spread spectrum or arrowband phase modulation technique usually, and modulation ratio is fixed in the modulator approach, and the carrier cycle that code element takies is constant.Have time variation because low-voltage power line channel strip width, circuit disturb, under the situation that the power carrier channel quality improves, the conventional modulated method makes channel width not be fully used, and channel utilization reduces; When power carrier channel quality variation, the error rate increases, and can not correctly transmit information, and channel transport efficiency also reduces.The present invention proposes a kind of method of low-voltage power carrier control code element carrier wave number, in the low-voltage power channel according to the situation of channel quality, adjust the carrier signal periodicity that single code element takies, under the situation that the power carrier channel quality improves, reduce the carrier signal periodicity that single code element takies, improve channel utilization; When power carrier channel quality variation, improve the carrier signal periodicity that single code element takies, reduce the error rate, improve the signal transmission efficiency.
Summary of the invention
The embodiment of the invention provides a kind of method and equipment that signal is modulated, and can solve in the prior art modulation ratio and fix and cause the not high problem of code efficiency.
In order to solve the problems of the technologies described above, the embodiment of the invention provides the method for control code element carrier wave number in a kind of power carrier, comprising:
Determine the modulation ratio parameter according to the power circuit communication quality;
Generate the carrier cycle control signal according to described modulation ratio parameter;
Control the carrier signal periodicity that code element takies according to described carrier cycle control signal.
Correspondingly, the embodiment of the invention also provides a kind of modulator that signal is modulated of being used for, and comprising:
Determining unit is used for determining the modulation ratio parameter according to the power circuit communication quality;
Generation unit is used for generating the carrier cycle control signal according to described modulation ratio parameter;
Control unit is used for the carrier signal periodicity that takies according to described carrier cycle control signal control code element.
Because the present invention determines the carrier cycle issue that each code element takies according to the quality of the communication quality of power circuit, therefore when communication quality is better, code element can take less carrier cycle, when communication quality is relatively poor, code element then takies more carrier cycle, data bit after the modulation has the high efficiency effect, thereby improves channel utilization.
Description of drawings
Fig. 1 is the flow chart of the method for control code element carrier wave number in a kind of power carrier of the embodiment of the invention;
Fig. 2 is the structure chart of a kind of modulator in the embodiment of the invention;
Fig. 3 is the coding example case study figure that utilizes a kind of modulator approach in the embodiment of the invention;
Fig. 4 is the coding example case study figure that utilizes the unfixed modulator approach of code element in the embodiment of the invention.
Fig. 5 is the specific implementation structure chart of modulator approach in the embodiment of the invention;
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing the 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 shows the flow chart of the method for control code element carrier wave number in a kind of power carrier of the embodiment of the invention, and as shown in Figure 1, the embodiment of the invention provides a kind of method that is used for signal is carried out carrier modulation, is specially:
Step S101 determines the modulation ratio parameter according to the power circuit communication quality.
Particularly, the power circuit communication quality is tested channel quality by the conventional means of prior art the inside herein, thereby obtains the communication quality of power circuit, and then determines the modulation ratio parameter according to the communication quality and the predetermined rule of power circuit.Described rule for example when channel quality during in a certain scope (for example: the error rate is 10E-5 to a 10E-4 scope), determines that the modulation ratio parameter is a fixed value (for example 5).
Step S102 generates the carrier cycle control signal according to described modulation ratio parameter.
Specifically be meant herein, generate the carrier cycle control signal according to the modulation ratio parameter of determining among the step S101.And the carrier signal periodicity that code element takies is different because of the situation of power circuit communication quality, that is to say, under different channel quality conditions, take different carrier signal periodicities with " 0 " or " 1 ", described carrier signal periodicity is directly actuated by the modulation ratio parameter, as determining that in step S101 the modulation ratio parameter is 5, then when modulation, the carrier signal periodicity that each " 0 " or " 1 " take is 5 cycles.If determine that in step S101 the modulation ratio parameter is 5, then the carrier cycle control signal is 0101, and each " 0 " or " 1 " are defined as a certain fixed cycle value at first, and for example 6 represent, then " 0 " sign indicating number is six cosine cycles, and " 1 " sign indicating number is six sinusoidal period.
Particularly, the embodiment of the invention can be embodied as except that start element, and the maximum length of single element is 15 carrier cycles, and minimum length is 1 carrier cycle.That is to say, when the error rate is a certain scope (for example: the error rate is 10E-5 to a 10E-4 scope), determine the modulation ratio parameter be a fixed value (for example: 5), in this case, the expression mode that can determine start element is 0101, has promptly determined the carrier cycle control signal.Also the maximum length of may command single element is bigger or littler to it should be noted that the embodiment of the invention, is promptly controlled by modulation ratio parameter or carrier cycle control signal.For example: when the carrier cycle control signal was 5, the maximum length of single element was 31 carrier cycles, and minimum length is 1 carrier cycle.
Step S103 controls the carrier signal periodicity that code element takies according to described carrier cycle control signal.
Specifically be meant herein, control the carrier signal periodicity that each code element takies according to the carrier cycle control signal of determining among the step S102.Be specially, the expression mode of having determined start element in step S102 is 0101, has promptly determined the carrier cycle control signal.According to described carrier cycle control signal, control the carrier signal periodicity that single code element takies in the power circuit of back.For example herein, the carrier cycle control signal is expressed as 0101 and is 5, and then back each " 0 " or " 1 " code element all use 5 carrier cycles to represent.
Describe at the modulator that utilizes above-mentioned modulator approach below, Fig. 2 shows the structure chart of a kind of modulator in the embodiment of the invention, and as shown in the figure, described modulator 20 comprises:
Determining unit 201 is used for determining the modulation ratio parameter according to the power circuit communication quality.
Particularly, the power circuit communication quality is tested channel quality by the conventional means of prior art the inside herein, thereby obtains the communication quality of power circuit, and then determines the modulation ratio parameter according to the communication quality and the predetermined rule of power circuit.For example, when channel quality during in a certain scope (for example: the error rate is 10E-5 to a 10E-4 scope), determine that the modulation ratio parameter is a fixed value (for example 5).
Specifically be meant herein, generate the carrier cycle control signal according to the modulation ratio parameter of determining in the determining unit 201.And the carrier signal periodicity that code element takies is different because of the situation of power circuit communication quality, that is to say, under different channel quality conditions, take different carrier signal periodicities with " 0 " or " 1 ", described carrier signal periodicity is directly actuated by the modulation ratio parameter, determining unit 201 determines that the modulation ratio parameter is 5, then when modulation, the carrier signal periodicity that each " 0 " or " 1 " take is 5 cycles.
Particularly, the embodiment of the invention can be embodied as except that start element, and the maximum length of single element is 15 carrier cycles, and minimum length is 1 carrier cycle.That is to say, when the error rate is a certain scope (for example: the error rate is 10E-5 to a 10E-4 scope), determine the modulation ratio parameter be a fixed value (for example: 5), in this case, the expression mode that can determine start element is 0101, has promptly determined the carrier cycle control signal.
Specifically be meant herein, control the carrier signal periodicity that each code element takies according to the carrier cycle control signal that generates in the generation unit 202.Be specially, the expression mode of having determined start element in generation unit 202 is 0101, has promptly determined the carrier cycle control signal.According to described carrier cycle control signal, control the carrier signal periodicity that single code element takies in the power circuit of back.For example herein, the carrier cycle control signal is expressed as 0101 and is 5, and then back each " 0 " or " 1 " code element all use 5 carrier cycles to represent.
Can also constitute a communication system at the modulator that utilizes above-mentioned modulator approach.This system is used for determining the modulation ratio parameter according to the power circuit communication quality, and generates the carrier cycle control signal according to pre-determined rule and modulation ratio parameter; And control the carrier signal periodicity that code element takies according to described carrier cycle control signal.
Lift instantiation below and describe embodiment of the present invention in detail.
As shown in Figure 3, for utilizing the coding example case study figure of a kind of modulator approach in the embodiment of the invention, as shown in Figure 3, carrier signal is a sinusoidal signal, and start of frame bits is 0.Utilization well known to a person skilled in the art the communication quality of means measurement power circuit, when the error rate during at a certain definite interval value, for example: 10E-5 to 10E-4 scope, the modulation ratio parameter can be defined as 5, then the carrier cycle control signal is expressed as 0101, in the embodiment of the invention, initial expression carrier cycle control signal, each " 0 " or " 1 " represents with 6 carrier cycles, as shown in the figure.Because the modulation ratio parameter is 5, then can determine again, the back each " " 1 " information code element is by 5 sinusoidal wave expressions.
As Fig. 4 is the unfixed coding example case study of code element figure in the embodiment of the invention.Carrier signal is a sinusoidal signal, and start of frame bits is 0.Utilization well known to a person skilled in the art the communication quality of means measurement power circuit, when the error rate at a certain definite interval value is, for example: 10E-7 to 10E-6 scope can be defined as 3 with the modulation ratio parameter, then the carrier cycle control signal is expressed as 0011, in the embodiment of the invention, initial expression carrier cycle control signal, each " 0 " or " 1 " are represented with 6 carrier cycles, as shown in the figure, because the modulation ratio parameter is 3, can determine then that again " 11 " are by 6 sinusoidal wave expressions.
Shown in Figure 5, for utilizing the specific implementation structure chart of modulator approach in the embodiment of the invention, at first produce a clean carrier signal a (t), be used for carrying the digital baseband signal that will transmit, for example a (t)=Asin (t);
Then clean carrier signal is carried out 180 degree phase shifts, obtain a
1(t)=-Asin (t), combine the common modulation that is used for digital baseband signal with clean carrier signal a (t);
Secondly exactly the raw symbol sequence is encoded, produce and current sequence of symhols wanted carrier number of cycles corresponding modulated symbol sequence b (t), b (t) production process is as follows:
As Fig. 4, determine that according to power circuit communication quality and predetermined rule the modulation ratio parameter is 3, then sequence of symhols is 0011, start bit " 0 " sign indicating number takies 3 carrier cycles, as shown in Figure 4.Be two " 1 " sign indicating number afterwards, represent with six sine waves.
After modulated symbol b (t) produced, as selecting control signal, control switch was at primary carrier a (t) and the dephased carrier wave a of 180 degree with described modulated symbol
1(t) the switching output between realizes the BPSK modulation, is specially: if b (t) for just, then is allocated to K1 with switch, a (t) is modulated; If b (t) then is allocated to switch K2, to a for negative
1(t) modulate, produce the output signal S after the complete modulation at last
Out
The method of control code element carrier wave number in a kind of power carrier provided by the invention, make at the power circuit communication quality preferably the time, single code element takies less carrier cycle issue, and when the power circuit communication quality was relatively poor, single code element took more carrier cycle issue, controlled the periodicity that code element takies carrier wave flexibly, improved the utilance of channel, and then improved transmission efficiency, like this, code efficiency is greatly enhanced, and has improved the reliability of coding simultaneously.
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 (10)
1. the method for control code element carrier wave number in the power carrier is characterized in that, comprising:
Determine the modulation ratio parameter according to the power circuit communication quality;
Generate the carrier cycle control signal according to described modulation ratio parameter;
Control the carrier signal periodicity that code element takies according to described carrier cycle control signal.
2. method according to claim 1 is characterized in that, the carrier signal periodicity that described code element takies is different because of the situation of power circuit communication quality.
3. method according to claim 1 is characterized in that, describedly determines that according to the power circuit communication quality modulation ratio parameter specifically is meant:
Determine the modulation ratio parameter according to power circuit communication quality and predetermined rule.
4. method according to claim 3 is characterized in that, described predetermined rule comprises:
When the power circuit communication quality is in a certain definite interval value, is defined as certain specific modulation and compares parameter.
5. method according to claim 1 is characterized in that, the described carrier signal periodicity that takies according to described carrier cycle control signal control code element specifically is meant:
Control the carrier signal periodicity that the single code element transmitted in the power circuit takies according to described carrier cycle control signal.
6. a modulator is characterized in that, comprising:
Determining unit is used for determining the modulation ratio parameter according to the power circuit communication quality;
Generation unit is used for generating the carrier cycle control signal according to described modulation ratio parameter;
Control unit is used for the carrier signal periodicity that takies according to described carrier cycle control signal control code element.
7. modulator according to claim 6 is characterized in that, the carrier cycle issue that described code element takies is different because of the situation of power circuit communication quality.
8. modulator according to claim 6 is characterized in that, describedly determines that according to the power circuit communication quality modulation ratio parameter specifically is meant:
Determine the modulation ratio parameter according to power circuit communication quality and predetermined rule.
9. modulator according to claim 8 is characterized in that, described predetermined rule also comprises:
When the power circuit communication quality is in a certain definite interval value, is defined as certain specific modulation and compares parameter.
10. modulator according to claim 6 is characterized in that, the described carrier signal periodicity that takies according to described control signal control code element specifically is meant:
Control the carrier signal periodicity that the single code element transmitted in the power circuit takies according to described carrier cycle control signal.
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| CN200910255796A CN101783780A (en) | 2009-12-29 | 2009-12-29 | Method and device for controlling number of code element carriers in power carrier |
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| CN200910255796A CN101783780A (en) | 2009-12-29 | 2009-12-29 | Method and device for controlling number of code element carriers in power carrier |
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Cited By (2)
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| CN103281104A (en) * | 2013-03-18 | 2013-09-04 | 苏州五希通信科技有限公司 | Modulation-demodulation method based on transmission of distant protection command by power line carrier |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20140074648A (en) * | 2012-12-10 | 2014-06-18 | 현대모비스 주식회사 | Integrated Receiving System for Vehicle |
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| KR101986289B1 (en) * | 2012-12-10 | 2019-09-30 | 현대모비스 주식회사 | Integrated Receiving System for Vehicle |
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| CN103281104B (en) * | 2013-03-18 | 2015-02-18 | 苏州五希通信科技有限公司 | Modulation-demodulation method based on transmission of distant protection command by power line carrier |
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