CN105680994B - LDPC coding method for transmission link of monitoring data of power transmission line - Google Patents
LDPC coding method for transmission link of monitoring data of power transmission line Download PDFInfo
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- CN105680994B CN105680994B CN201610060361.4A CN201610060361A CN105680994B CN 105680994 B CN105680994 B CN 105680994B CN 201610060361 A CN201610060361 A CN 201610060361A CN 105680994 B CN105680994 B CN 105680994B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 138
- 230000005540 biological transmission Effects 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004806 packaging method and process Methods 0.000 claims abstract description 21
- 238000012856 packing Methods 0.000 claims abstract description 19
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 9
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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Abstract
The invention provides an LDPC coding method for a transmission link of monitoring data of a power transmission line, which determines the LDPC packaging capacity of a terminal monitoring node; the method comprises the steps of obtaining an LDPS data packet and an LDPS position packet of a terminal monitoring node, and synthesizing to obtain an LDPS transmission packet; filling the LDPC packing number in the LDPS transmission packet into predefined data redundancy codes and transmission redundancy codes; and decoding the data redundancy codes and the transmission redundancy codes. The method provided by the invention solves the problem of poor reliability in the existing power transmission line monitoring; on the basis of ensuring high network transmission reliability, the safety and stability of transmission data are ensured, the overall stability of a power transmission system is further improved, and the monitoring and operating cost is reduced.
Description
Technical Field
The invention relates to the technical field of wireless broadband communication, in particular to an LDPC coding method for a transmission link of monitoring data of a power transmission line.
Background
The power transmission line equipment state monitoring system is an important technical means for realizing state operation maintenance management of power transmission and transformation equipment and improving the lean level of professional production operation management of power transmission and transformation. The system realizes real-time perception, monitoring and early warning, analysis and diagnosis, evaluation and prediction of the running state of various power transmission and transformation equipment through various sensor technologies, wide area communication technologies and information processing technologies. With the rapid advance of the modern company of 'one-strong three-excellent' and the strong smart grid strategy established by the national grid company, the increase of the safe operation level of the grid by adopting scientific and technological means becomes the inevitable trend of the development of the modern grid. The online monitoring of the power transmission line is an extremely important component in the national smart grid project, is a main means for realizing the reliable, safe, economic, efficient and environment-friendly targets of the national power grid, and has a very positive significance for further improving the safe operation level of the electric power.
At present, the wireless 3G (wcdma) technology based on the public network is mostly adopted for the online monitoring of the power transmission line, but in practical application, many problems exist, for example, a blind area exists in a 3G network coverage area, wireless transmission online monitoring equipment cannot be deployed in some remote areas, and a situation that signals are not strong in a part of the area already covering the 3G network and actual monitoring requirements cannot be completed exists. In addition, the definition of video support is poor due to the limitation of network uplink bandwidth of the 3G technology, only low-bandwidth application can be supported, smooth high-definition video monitoring service is difficult to provide, flow cost always occurs by adopting a wireless public network, and particularly the flow cost is increased rapidly under the condition of large bandwidth demand. In the aspect of information security, all data of the wireless public network pass through an operator network, a data transmission link is added, instantaneity is poor, and the problem of data security risk exists.
Disclosure of Invention
In view of the above, the LDPC encoding method for the transmission link of the transmission line monitoring data provided by the invention solves the problem of poor reliability in the existing transmission line monitoring; on the basis of ensuring high network transmission reliability, the safety and stability of transmission data are ensured, the overall stability of a power transmission system is further improved, and the monitoring and operating cost is reduced.
The purpose of the invention is realized by the following technical scheme:
an LDPC coding method for a transmission link of transmission line monitoring data comprises the following steps:
step 1, determining LDPC packaging capacity of a terminal monitoring node;
step 2, acquiring an LDPS data packet and an LDPS position packet of the terminal monitoring node, and synthesizing to obtain an LDPS transmission packet;
step 3, filling the LDPC packing number in the LDPS transmission packet into predefined data redundancy codes and transmission redundancy codes;
and 4, decoding the data redundant codes and the transmission redundant codes.
Preferably, the step 1 comprises:
and determining the LDPC packaging capacity of the terminal monitoring node according to the current channel parameters between the terminal monitoring node and the remote substation node.
Preferably, the step 2 comprises:
2-1, packing the transmission data of the current terminal monitoring node according to the LDPC packing capacity;
2-2, acquiring the LDPC packaging number of the current terminal monitoring node to obtain an LDPS data packet of the terminal monitoring node;
2-3, carrying out LDPC packaging on the GPS information of the terminal monitoring node to obtain an LDPS position package of the terminal monitoring node;
and 2-4, synthesizing the LDPS data packet and the LDPS position packet of the terminal monitoring node into an LDPS transmission packet of the terminal monitoring node.
Preferably, step 4 is preceded by:
and sending the LDPS transmission packet, the data redundancy code and the transmission redundancy code to a sink node.
Preferably, the step 4 comprises:
4-1, decoding the data redundant code and the transmission redundant code, acquiring and judging the GPS information of the current terminal monitoring node, and obtaining the LDPS data of the sink node;
and 4-2, the terminal monitoring node sends the LDPS data packet of the sink node to a remote substation node.
Preferably, said 4-1 comprises:
a. the aggregation node decodes the transmission redundant code to acquire the GPS information of the current terminal monitoring node;
b. judging whether the GPS information is prestored GPS information of the terminal monitoring node;
if so, decoding the LDPS transmission packet of the terminal monitoring node;
if not, sending alarm information outwards;
c. the sink node collects the received LDPS transmission packet according to a local terminal monitoring node list;
d. judging whether the number of LDPS transmission packets of the terminal monitoring nodes is less than that of the terminal monitoring nodes in the local terminal monitoring node list or not;
if so, extracting information of the monitoring node of the non-receiving terminal, and sending a reporting instruction to the monitoring node of the non-receiving terminal;
if not, carrying out LDPS packaging on the current LDPS transmission packet of the terminal monitoring node to obtain an LDPS data packet of the sink node;
e. and filling the total number of the LDPS transmission packets of the terminal monitoring node into a predefined data redundancy code.
According to the technical scheme, the LDPC coding method for the transmission link of the monitoring data of the power transmission line is provided, and the LDPC packing capacity of the terminal monitoring node is determined; the method comprises the steps of obtaining an LDPS data packet and an LDPS position packet of a terminal monitoring node, and synthesizing to obtain an LDPS transmission packet; filling the LDPC packing number in the LDPS transmission packet into predefined data redundancy codes and transmission redundancy codes; and decoding the data redundancy codes and the transmission redundancy codes.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
1. in the technical scheme provided by the invention, the LDPC packaging capacity of the terminal monitoring node is determined according to the current channel parameter between the terminal monitoring node and the remote substation node; the problem of poor reliability in current transmission line monitoring is solved.
2. According to the technical scheme provided by the invention, transmission data of the current terminal monitoring node is packed according to the LDPC packing capacity of the terminal monitoring node, the packing number of the LDPC of the current terminal monitoring node is obtained, and an LDPS data packet of the terminal monitoring node is obtained; on the basis of ensuring high network transmission reliability, the safety and stability of transmission data are ensured, the overall stability of a power transmission system is further improved, and the monitoring and operating cost is reduced.
3. According to the technical scheme provided by the invention, the packing number of the LDPS data packet of the terminal monitoring node is filled into the predefined data redundancy code. The problem of poor reliability in current transmission line monitoring is solved.
4. The technical scheme provided by the invention has wide application and obvious social benefit and economic benefit.
Drawings
FIG. 1 is a flow chart of an LDPC encoding method for a transmission link of transmission line monitoring data according to the present invention;
FIG. 2 is a flow chart illustrating step 2 of the LDPC encoding method of the present invention;
FIG. 3 is a schematic flow chart of step 4 in the LDPC encoding method of the present invention;
FIG. 4 is a flowchart of steps S101 to S103 of a specific application example of the present invention;
FIG. 5 is a flowchart of steps S104 to S105 of an exemplary embodiment of the present invention;
fig. 6 is a flowchart of steps S1061 to S107 of a specific application example of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an LDPC encoding method for a transmission link of monitoring data of a power transmission line, comprising the following steps:
step 1, determining LDPC packaging capacity of a terminal monitoring node;
step 2, acquiring an LDPS data packet and an LDPS position packet of the terminal monitoring node, and synthesizing to obtain an LDPS transmission packet;
step 3, filling the LDPC packing number in the LDPS transmission packet into the predefined data redundancy code and transmission redundancy code;
and 4, decoding the data redundancy codes and the transmission redundancy codes.
Wherein, step 1 includes:
and determining the LDPC packaging capacity of the terminal monitoring node according to the current channel parameters between the terminal monitoring node and the remote substation node.
As shown in fig. 2, step 2 includes:
2-1, packing the transmission data of the current terminal monitoring node according to the LDPC packing capacity;
2-2, acquiring the LDPC packaging number of the current terminal monitoring node to obtain a terminal monitoring node LDPS data packet;
2-3, carrying out LDPC packaging on the GPS information of the terminal monitoring node to obtain an LDPS position package of the terminal monitoring node;
and 2-4, synthesizing the LDPS data packet and the LDPS position packet of the terminal monitoring node into an LDPS transmission packet of the terminal monitoring node.
Wherein, step 4 also includes before:
and sending the LDPS transmission packet, the data redundancy code and the transmission redundancy code to the sink node.
As shown in fig. 3, step 4 includes:
4-1, decoding the data redundant code and the transmission redundant code, acquiring and judging the GPS information of the current terminal monitoring node, and obtaining the LDPS data of the sink node;
and 4-2, the terminal monitoring node sends the LDPS data packet of the sink node to the remote substation node.
Wherein, 4-1 comprises:
a. the aggregation node decodes the transmission redundant code to acquire the GPS information of the current terminal monitoring node;
b. judging whether the GPS information is prestored GPS information of the terminal monitoring node;
if so, decoding the LDPS transmission packet of the terminal monitoring node;
if not, sending alarm information outwards;
c. the sink node collects the received LDPS transmission packet according to a local terminal monitoring node list;
d. judging whether the number of LDPS transmission packets of the terminal monitoring nodes is less than that of the terminal monitoring nodes in a local terminal monitoring node list or not;
if so, extracting the information of the monitoring node of the non-receiving terminal, and sending a reporting instruction to the monitoring node of the non-receiving terminal;
if not, carrying out LDPS packaging on the LDPS transmission packet of the current terminal monitoring node to obtain an LDPS data packet of the sink node;
e. and filling the total number of the LDPS transmission packets of the terminal monitoring node into a predefined data redundancy code.
As shown in fig. 4 to 6, the present invention provides a specific application example of an LDPC encoding method for a transmission link of power transmission line monitoring data, which is as follows:
is implemented in a multi-stage communication link of a terminal monitoring node, a sink node, a remote substation node and a monitoring master station arranged on a power transmission line,
step S101; determining the LDPC packaging capacity of the terminal monitoring node according to the current channel parameters between the terminal monitoring node and the remote substation node;
step S102; packing the transmission data of the current terminal monitoring node according to the LDPC packing capacity of the terminal monitoring node, acquiring the packing number of the LDPC of the current terminal monitoring node, and acquiring an LDPS data packet of the terminal monitoring node;
step S103; and filling the packaging number of the LDPS data packet of the terminal monitoring node into a predefined data redundancy code.
Wherein, the step S102 further includes:
performing LDPC (Low Density parity check) packing on the GPS information of the terminal monitoring node to obtain an LDPS (Low Density parity check) position package of the terminal monitoring node; and synthesizing the LDPS data packet of the terminal monitoring node and the LDPS position packet of the monitoring node into an LDPS transmission packet of the terminal monitoring node.
Wherein, step S103 also includes;
step S104, filling the packaging number of the LDPS transmission packet of the terminal monitoring node into a predefined transmission redundant code;
wherein, the step S104 is followed by further comprising;
step S105, sending the LDPS transmission packet, the data redundancy code, and the transmission redundancy code of the terminal monitoring node to the sink node.
Wherein, after the step S105, the method further comprises,
step S1061: the aggregation node decodes the transmission redundant code to acquire the GPS information of the current terminal monitoring node;
step S1062: and judging whether the GPS information of the terminal monitoring node is prestored GPS information of the terminal monitoring node, if so, decoding an LDPS transmission packet of the terminal monitoring node, and if not, sending alarm information outwards.
Wherein, step S1062 is followed by:
step S1063: the sink node collects the received LDPS transmission packets of the terminal monitoring nodes according to a local terminal monitoring node list;
step S1063: judging whether the number of LDPS transmission packets of the terminal monitoring nodes is less than that of the terminal monitoring nodes in the local terminal monitoring node list, if so, extracting information of the non-received terminal monitoring nodes, and sending a reporting instruction to the non-received terminal monitoring nodes; if not, carrying out LDPS packaging on the current LDPS transmission packet of the terminal monitoring node to obtain an LDPS data packet of the sink node;
step S1064: and filling the total number of the LDPS transmission packets of the terminal monitoring node into the predefined data redundancy codes.
Wherein, step S1064 is followed by:
step S107: and the terminal monitoring node sends the LDPS data packet of the sink node to the remote substation node.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (3)
1. An LDPC encoding method for a transmission link of transmission line monitoring data, the method comprising the steps of:
step 1, determining LDPC packaging capacity of a terminal monitoring node;
step 2, acquiring an LDPS data packet and an LDPS position packet of the terminal monitoring node, and synthesizing to obtain an LDPS transmission packet;
step 3, filling the LDPC packing number in the LDPS transmission packet into the predefined data redundancy code and transmission redundancy code;
step 4, decoding the data redundant code and the transmission redundant code, acquiring and judging the GPS information of the current terminal monitoring node, and obtaining the LDPS data of the sink node;
step 5, the terminal monitoring node sends the LDPS data packet of the sink node to a remote substation node;
the step 4 comprises the following steps:
4-1, decoding the transmission redundant code by the aggregation node to acquire the GPS information of the current terminal monitoring node;
4-2, judging whether the GPS information is prestored GPS information of the terminal monitoring node;
if so, decoding the LDPS transmission packet of the terminal monitoring node;
if not, sending alarm information outwards;
4-3, the sink node collects the received LDPS transmission packet according to a local terminal monitoring node list;
4-4, judging whether the number of LDPS transmission packets of the terminal monitoring nodes is less than that of the terminal monitoring nodes in the local terminal monitoring node list;
if so, extracting information of the monitoring node of the non-receiving terminal, and sending a reporting instruction to the monitoring node of the non-receiving terminal;
if not, carrying out LDPS packaging on the current LDPS transmission packet of the terminal monitoring node to obtain an LDPS data packet of the sink node;
4-5, filling the total number of the LDPS transmission packets of the terminal monitoring node into a predefined data redundancy code;
the step 2 comprises the following steps:
2-1, packing the transmission data of the current terminal monitoring node according to the LDPC packing capacity;
2-2, acquiring the LDPC packaging number of the current terminal monitoring node to obtain a terminal monitoring node LDPS data packet;
2-3, carrying out LDPC packaging on the GPS information of the terminal monitoring node to obtain an LDPS position package of the terminal monitoring node;
and 2-4, synthesizing the LDPS data packet and the LDPS position packet of the terminal monitoring node into an LDPS transmission packet of the terminal monitoring node.
2. The method of claim 1, wherein step 1 comprises:
and determining the LDPC packaging capacity of the terminal monitoring node according to the current channel parameters between the terminal monitoring node and the remote substation node.
3. The method of claim 1, wherein step 4 is preceded by:
and sending the LDPS transmission packet, the data redundancy code and the transmission redundancy code to the sink node.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1625262A (en) * | 2003-12-03 | 2005-06-08 | 北京泰美世纪科技有限公司 | Framing method based on LDPC |
| CN101483567A (en) * | 2008-12-19 | 2009-07-15 | 西北电网有限公司 | High voltage electricity transmission line monitoring method based on wireless communication and optical communication |
| KR20140055101A (en) * | 2012-10-30 | 2014-05-09 | 한전케이디엔주식회사 | Monitoring apparatus and manegement system of power transmission line using load cell |
| CN103853143A (en) * | 2014-03-26 | 2014-06-11 | 南京航赛智能科技有限公司 | Long-distance wireless monitoring network system applied in power transmission line of power supply system |
| CN103941138A (en) * | 2014-04-16 | 2014-07-23 | 华北电力大学 | OPGW whole-wire monitoring and diagnosing system and method |
| CN104469823A (en) * | 2014-12-17 | 2015-03-25 | 湖南大学 | WSN time delay optimizing method applied to electric transmission line on-line monitoring |
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- 2016-01-28 CN CN201610060361.4A patent/CN105680994B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1625262A (en) * | 2003-12-03 | 2005-06-08 | 北京泰美世纪科技有限公司 | Framing method based on LDPC |
| CN101483567A (en) * | 2008-12-19 | 2009-07-15 | 西北电网有限公司 | High voltage electricity transmission line monitoring method based on wireless communication and optical communication |
| KR20140055101A (en) * | 2012-10-30 | 2014-05-09 | 한전케이디엔주식회사 | Monitoring apparatus and manegement system of power transmission line using load cell |
| CN103853143A (en) * | 2014-03-26 | 2014-06-11 | 南京航赛智能科技有限公司 | Long-distance wireless monitoring network system applied in power transmission line of power supply system |
| CN103941138A (en) * | 2014-04-16 | 2014-07-23 | 华北电力大学 | OPGW whole-wire monitoring and diagnosing system and method |
| CN104469823A (en) * | 2014-12-17 | 2015-03-25 | 湖南大学 | WSN time delay optimizing method applied to electric transmission line on-line monitoring |
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