A transponder group message encoding and decoding method using distributed fountain codes
A fountain code and transponder technology, applied in the field of data communication, can solve problems such as the performance deterioration of distributed fountain codes, and achieve the effects of improving reliability and security and reducing error rate.
Active Publication Date: 2017-02-08
BEIJING JIAODA MICROUNION TECH
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Problems solved by technology
[0012] However, the use of balise groups will cause such a problem: when the train passes through the balise group at a certain moment, only one balise can communicate with the on-board equipment of the train
[0028] SLRC can solve the problem of poor performance of distributed fountain codes caused by changes in the number of nodes
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[0059] refer to Figure 1-8 Examples of the present invention will be described.
[0060] In order to make the above objects, features and advantages more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0061] figure 1 Such a scene is depicted in : There is a set of two transponders b at the front of the railway curve 1 , b 2 The composed transponder group is used to provide curve information for the train and ensure that the train passes through the curve smoothly. two transponders b 1 , b 2 The effective area of action is respectively denoted by Z 1 ,Z 2 Indicates that there is an overlap between the two areas of action, and the overlapping area is represented by Z 3 express. Train T travels from left to right and enters two transponders b in turn 1 , b 2 The area of action Z 1 ,Z 3 ,Z 2 .
[0062] figure 2 yes figure 1 The network topology diagram ...
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The invention discloses a transponder group message encoding and decoding method adopting a distributed fountain code. The encoding method comprises the following steps that a distributed fountain code encoder collects all message information to be transmitted, fountain code encoding is carried out, and multiple groups of distributed fountain code encoding symbols are generated and are transmitted to each active transponder, or stored in an EEPROM (Electrically Erasable Programmable Read - Only Memory) of each passive transponder in a transponder group. An approach train receives messages of one or more transponders, and after carrying out virtual relaying processing, a distributed fountain code decoder uniformly decodes each message. According to the method, the problem of intersymbol interference in the transponder group can be effectively solved, and the reliability of transmission is improved. A mobile unit can fully utilizes data transmitted by a plurality of transponders, so that the error rate of transmission is reduced. The use restriction of intersymbol interference on a sidelobe action zone of each transponder is eliminated, and trains can pass through action zones of the transponder group at higher speed.
Description
technical field [0001] The invention relates to the technical field of data communication, in particular to a method for encoding and decoding messages of a transponder group using distributed fountain codes. Background technique [0002] The transponder is a high-speed point-type data transmission device based on electromagnetic induction, which is used to realize the information transmission between the ground and the train at a specific location. As the speed of trains continues to increase, only relying on track circuits cannot meet the information requirements of high-speed trains. It is necessary to increase the transponder equipment to provide a large amount of information to the on-board train control equipment. The transponder is an indispensable equipment in the speed increase of the existing railway line and the passenger dedicated line. [0003] Transponders can be divided into two types: European standard transponders and Japanese transponders. Among them, the...
Claims
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IPC IPC(8): H04L1/00
Inventor 王文辉侯晓彬蒋大明冯锡生
Owner BEIJING JIAODA MICROUNION TECH