Graduation design thesis of data communication

In the future development, the data communication network will also be digital, intelligent and integrated to help people master more information. The following is my graduation thesis on data communication for your reference.

Data Communication Graduation Design Thesis 1 Research on Data Communication Technology of Network Coding

With the development of modern communication technology, the society demands higher and higher quality of network data communication. How to improve the quality of data communication under the existing data conditions and network resources is an important topic for network communication researchers. The emergence and application of network coding technology provides an effective solution to this kind of problem. The author analyzes and studies the data communication technology based on network coding to improve the quality of network communication, which is only for industry reference.

Keywords: network coding; Data transmission; online exchange

The emergence and application of network coding technology is an important change in the field of modern communication technology, which has changed the data transmission mode and processing mode of previous communication networks to a certain extent, reduced the generation of useless information in the process of information transmission, effectively increased the amount of information absorbed and output by the network, and laid a solid foundation for improving the quality of data communication. With the development of modern society, network coding technology plays an important role in the field of data communication.

1 Overview of network coding

1. 1 Basic principles of network coding

In data communication technology, network coding accurately locates the input-output relationship of network nodes. When the intermediate node has the encoding conditions, it can encode the received data in a certain way until it is transmitted to the subsequent nodes. The processing of subsequent nodes is controllable to a certain extent, and it can play its practical application value regardless of coding or not. If the received information needs to be encoded, it should be encoded again before transmission, and the encoded information can be transmitted repeatedly, thus finally ensuring that the encoded information reaches the destination node. After accurately decoding the information for the destination node, the basic information sent by the initial node can be obtained and judged.

Construction method of 1.2 network coding

In the process of network coding combination, how to realize the coding combination of receiving data is an important problem faced by people in related fields at present. Based on the actual situation of the current network coding structure, different network coding forms often have certain differences in concrete expression, especially in the selection of coding coefficients and the operation mode of block coding. In linear network coding, nodes generally perform linear coding combination operation on the received data packets to promote the orderly development of coding work. At present, there are differences in the selection of coding coefficients. There are two kinds of network coding structures, one is deterministic network coding, and the other is stochastic network coding. The construction method of deterministic network coding has certain particularity, which mainly calculates the coding coefficient according to a certain algorithm, while the random network coding determines the coding coefficient according to the random selection of Galois symbols. Through the comparison and analysis of the two methods, we can see that the random network coding construction method is flexible and can achieve ideal network coding quality and efficiency in practical application. According to the different coding methods in the actual operation of network system, coding can be divided into centralized network coding and distributed network coding. Among them, on the basis of accurately grasping the overall topological structure of the network, centralized network coding reasonably allocates and arranges corresponding coding coefficients according to the overall situation of the network to improve the effectiveness of network coding. However, as far as the actual situation is concerned, once the topological structure changes greatly, centralized network coding is difficult to deal with effectively, and there must be some limitations in practical application. The application of distributed network coding can realize the corresponding coding operation after mastering the local topology information in the network system. Relevant practical research shows that distributed network coding has a good application effect in data communication technology.

Research on network data transmission of 1.3 network coding application

The first is to reduce the complexity of network coding. At present, the most important problem is how to reduce the complexity of network coding while improving the efficiency of network coding, and gradually control the complexity of network coding in the actual network coding process to reduce the extra calculation required for network coding, thus reducing the cost of system implementation. The second is the study of data transmission reliability. At present, the research on the reliability of network data transmission by network coding is mainly based on multipath routing, which also provides reliability for data transmission in network coding to some extent. Therefore, in the multi-hop dynamic network environment, it is of great practical significance to analyze and study how to improve the reliability of network coded data transmission.

The application of 1.4 network coding in data communication technology

Generally speaking, network coding refers to the organic conversion of coding and routing information to achieve technical goals. Network coding is a new technology in the field of modern data communication. After the data streams received by the system are reorganized and arranged reasonably, the multivariate data are reorganized based on different paths. Through the effective use of coding coefficient, the scientific processing of data is realized, and the original data is finally recovered effectively. The effective application of network coding technology in data communication technology can enhance communication capacity and improve communication quality to a certain extent. In the field of data communication, the original network level and modern network will be organically integrated, and the data processing mode of data communication technology will be changed and the modern development of data communication technology will be promoted by effectively exerting their respective application values and coordination. In other words, network coding technology has good application value in the field of data communication technology, which promotes the orderly transmission of a large number of data information, and the efficiency and stability of actual transmission can be effectively guaranteed. The effective application of network coding technology promotes the smooth transmission of network data and information, and the amount of information transmission is obviously increased, which obviously reduces the transmission times, improves the network operation quality, improves the network data transmission performance, promotes the overall broadband utilization rate, improves the utilization rate of energy resources, and effectively enhances the security of wireless network communication. Therefore, with the continuous progress of science and technology in modern society, the data communication technology based on network coding is developing by leaps and bounds, which will become an important development trend of communication technology in the future and is worth further research and promotion.

Analysis and Research of Data Communication Technology Based on Network Coding

2. 1 routing protocol based on network coding

The analysis and research of data communication technology based on network coding shows that the optimal design of routing protocol based on network coding technology has certain particularity. As an important content of network data transmission analysis and research, it has an important impact on network data transmission performance. The routing protocol based on network coding provides a reliable basis for the realization and reasonable application of network coding. By organically unifying network coding and routing protocols, the formation of high-level description is promoted. In this case, it provides a reliable theoretical basis for the innovation of network system and the scientific design of network equipment, and promotes the development of modern data communication technology. As far as the practical application of network coding routing protocol is concerned, it is mainly reflected in two aspects: network coding of independent routing protocol and coding-aware routing protocol. Based on whether there are active coding opportunities, it is judged whether the routing protocol can create more coding opportunities, so as to effectively use related coding opportunities and improve the quality and effect of data communication.

2.2 Network protocol structure based on network coding

At present, the data communication technology based on network coding is mainly based on the network layer. With the organic integration of network coding and routing protocols, other protocol layers in the network coding protocol structure have been deepened. However, compared with the traditional network data transmission mode, the inherent characteristics of network coding are unique. After introducing network coding into the existing network data transmission protocol, it is easy to encounter new network coding problems, including limited compatibility and the inherent influence of network coding on the network protocol level. In the future development of network coding data communication technology, such problems can provide a reliable basis for the follow-up network coding research, promote the organic integration of network coding and existing network protocols, improve the effectiveness and reliability of network data transmission performance, and enhance the effective application value of network coding in the field of data communication.

2.3 Data transmission performance guarantee mechanism based on network coding

In the standard network environment, network data transmission is easily affected by the variability of network topology and the suddenness of data transmission, which leads to instability of network data transmission, even packet loss and data transmission delay. Therefore, the data communication technology based on network coding should explore coding strategies and methods to ensure data transmission performance according to the actual running state of the network, so as to maximize the reliability of data transmission and avoid the occurrence of data transmission delay. Relevant scholars' research shows that adopting multi-rate coding mechanism and using data from different links to realize relevant decision-making mechanism is helpful to reduce the influence of network coding on data transmission and effectively control data transmission delay. In the future development process, relevant solutions still need to be further explored.

2.4 Data transmission model based on network coding

This construction algorithm lays a reliable foundation for the successful construction of network coding and the successful decoding of data by all nodes in the network. In practical application, the algorithm has low complexity and is easy to deploy. At present, the code construction algorithms of network coding mainly include linear network coding and random network coding. According to the actual situation of coding mechanism design, linear network coding is generally adopted, and the received information of different input links is linearly combined based on network intermediate nodes, and then the combined data is forwarded. As far as the practical application of linear network coding is concerned, it mainly includes typical code construction algorithms such as exponential time algorithm, polynomial algorithm and random network coding algorithm. The random linear network coding scheme often has the flexibility of relatively independent network topology, so the linear coding operation form is simple, which can improve the quality and effect of data communication. In the actual coding process, random linear network coding construction scheme is often adopted.

3 Conclusion

Through the analysis and research of data communication technology based on network coding, we can know that network coding in China is still in the initial stage of practical application, and the scheme design and simplification of complex coding need to be further improved to reduce the complexity of network coding, reduce the operating cost of the protocol and promote the effective solution of various problems in the application of data communication technology. In the future research, we should constantly strengthen the innovation of network coding data communication technology and make it more widely used in all fields of society.

refer to

[1], Lu, Zeng Yinqiang. Joint algorithm design of channel coding and network coding under C-RAN platform [J]. Guangdong Communication Technology, 20 16(4).

[2] Renee. The application and development trend of network coding in wireless networks [J]. Science and Technology Entrepreneurship Monthly, 20 13(5).

Li Fan. Principle and application of network coding technology [J]. Journal of Chengdu Textile College, 20 12( 1).

The second part of the graduation design paper of data communication "Analysis on the improvement measures of high-speed railway data communication network routing"

First, introduce the application principle of IS-IS protocol.

In the railway data communication network protocol, aa.00b 1b2.xxxx.xxxx.00 is the main address format of NSAP. Its AA represents the address of the private network; Its B 1 and B2 are used as the last two-digit array of the autonomous domain number to which the device belongs. We all know that the AS value of Guangzhou Railway Group is 65 1 15, so the value of B 1B2 is15; The loopback address of its equipment is obtained after XXXX conversion. XXXX。 XXXX Let's take Huaiji Station AR0 1 as an example. After converting the loopback address, you can get 0 1000000 162, and then segment it every 4 bits, that is, 0 100.0000.0638. So we will get AR0 1 at Huaiji Station, and the final NASP is 49.005438+05.438+000.0000.062.00.

Secondly, the workflow of IS-IS protocol is summarized.

According to the routing protocol in IS-IS link state, when sharing and exchanging link state information, it is necessary to establish corresponding neighbor relations, which also lays a solid foundation for the exchange and sharing of link information. Among them, IS-IS mainly uses IIH messages to establish corresponding neighbor relations. If the interface is enabled with IS-IS protocol, you need to send IIH message immediately [1]. After the neighbor relationship is established, the neighbors will share the information in the synchronous link database. In LSDB, there are many basic link state information, which will be masked in the link state data message information. Simply put, synchronous LSDB is also the synchronization of LSP. In IS-IS, link state data message, partial queue message PSNP3 or complete queue number message CSNP are used, both of which need to complete the synchronization of link state database information within a specified time. However, both PSNP and CSNP need to apply database synchronization, but CS-NP only includes some information of PSNP, but the summary basic information of all lsps in LSDB.

Third, optimize the adjustment plan.

Taking the actual situation of the data communication network project of Guiguang high-speed railway as the main example, we combine the principle of IS-IS protocol with the construction standard of railway communication network, and adjust the data communication network of Guangzhou high-speed railway, which can solve some existing problems. Because the metric value of other redundant links can be set to 1024, and considering the structural characteristics of Guiguang railway communication network, traffic can be guided to share the load. It is necessary to set the metric value of all links in convergence layer and access layer to 1024, so that the traffic of different sites can be forwarded to different link layers to further improve the network performance. The specific method of modification is to execute the isiscost 1024level-2 command at the GE3/ 1 port of AR0 1 of Foshan West Station and the GE5/ 1 port of DR04 of Guangzhou South Station, and then continuously adjust the measurement value.

Fourth, optimize the verification results.

After modification, the routing table of Huaiji Station was checked, and it was found that the next address from DR03 to Guangzhou South Railway Station was POS2/ 1/4, and the cost value was constantly changing. The next hop from DR04 to Guangzhou South Railway Station is rag 1, or POS2/ 1/4. After adjusting the parameters, we can deeply study the changed values of the adjusted parameters, and the data traffic at the lower end of the router also changes obviously. V. Conclusion In a word, when setting the parameters of data communication network, we should not only consider the specific requirements of railway specifications, but also deeply analyze and study the design of network topology structure in combination with the actual situation of engineering construction, and scientifically and reasonably guide data traffic, share load and promote the stable and orderly operation of data communication services according to the actual situation of engineering.

The third part of data communication graduation thesis is "Design and analysis of wireless data communication system under GPRS network"

With the continuous expansion of the application scope of GSM, its defects in data transmission efficiency and spectrum utilization are gradually exposed, and GPRS network can not only effectively make up for the shortcomings of GSM under the action of packet switching technology, but also make the calculation method of communication cost more reasonable, which provides the possibility for cross-regional access, so the wireless data communication system based on GPRS network has attracted more and more attention. Under this background, this paper studies the structural design of wireless data communication system based on GPRS network to promote the development of wireless data communication system based on GPRS network.

GPRS network; Wireless data communication system; design

order

Mobile station MS, BSS base station subsystem, SGSN and GGSN are the main components of GPRS network. During its operation, GPRS and GSM base stations communicate effectively first, and then the base station sends GPRS packets to SGSN. After SGSN communicates with GGSN, the latter completes the processing of specific GPRS packets and sends the processing result to the corresponding network. Wireless data communication system usually relies on wireless network to realize communication function, which requires corresponding equipment, modules, servers and network structure. Therefore, the design and research of wireless data communication system based on GPRS network need to combine the working principle of GPRS network and wireless data communication system.

Design idea of 1 wireless data communication system based on GPRS network

At present, there are four schemes to realize network data transmission: directly applying for a fixed legal IP address to the user data center, applying for a fixed legal router to the user data center without a legal IP address, directly applying for a dynamic IP address to the user data processing center, and directly connecting the user data center to the GPRS network through a dedicated line. The general application of MobiteehModule in GPRS network can realize the conversion from Ethernet to GPRS network, from serial port to GPRS network, and from serial port to Ethernet, which makes it possible for multiple computers to access GPRS network resources at the same time, remote wireless networking and user terminals to enjoy computer network resources. Therefore, in the process of designing a wireless data communication system based on GPRS network, as long as the communication interface, communication protocol and communication strategy are specifically designed, the function of the wireless data communication system based on GPRS network can be improved.

2 Design process of wireless data communication system based on GPRS network

2. 1 communication interface design

Generally, in order to realize its wireless data transmission function, the wireless data communication system needs to use M2M module to send data requests to data, and use data sending interface and data reporting interface to send data. Need to actively serve its required remote control interface to send commands; The interface required by the server to set and query related structural state parameters; Based on the detection rules, the module puts forward the alarm monitoring interface related to the alarm, uses the M2M module to send non-text information to the server, and uses the module's own sms channel interface to send and receive mobile phone short messages, so it is necessary to ensure that all the above interfaces exist in the process of designing the interface of wireless data communication system based on GPRS network [1].

2.2 communication protocol design

Only when the wireless data communication center and the remote terminal can understand a certain language can the wireless data transmission be guaranteed, which is the communication protocol. Therefore, in the design process, it is usually necessary to describe or reflect the functions of the wireless data communication system in order to design the communication protocol in detail. The communication protocol designed by the author is a C/S structure with independent presentation layer, business logic layer and data layer. The independent design of the information interaction function between the center of gravity and the remote mesoscopic information as a message proxy module plays a positive role in improving the flexibility and functional expansibility of the wireless data communication system, and also plays a significant role in improving the operation efficiency of the business logic system and the security of the whole system. It should be noted that this communication protocol will make the original network transmission differences be ignored artificially in the application process, and provide a platform for GPRS network wireless data transmission, in other words, it is only defined for the application layer. In the process of information interaction between wireless data communication center and remote terminal, considering that GPRS network supports IP protocol, UDP protocol is applied to the communication process between MA and RTU network layer. However, considering its security, it is necessary to send the corresponding reply message immediately after sending the request message, and retransmit it in time after sending the request message but not getting the reply message to ensure the reliability of the communication process [2]. Considering that GPRS network takes traffic as the main charging basis, in the process of exchanging messages in communication protocols, binary format or XML format with relatively little data transmission is mainly adopted to save costs. Usually, its exchange message consists of communication preamble identification, protocol type, server ID, module ID, total number of data packets, current data packet index, the data packet group, content and other structures.

2.3 communication strategy design

Usually, the communication strategy is edited for GPRS unconfirmed transmission, reliable transmission but short message confirmation, reliable transmission without confirmation, image transmission without confirmation, etc. The specific design is determined and changed according to the corresponding program of the system.

3 Conclusion

Through the above analysis, we can find that the wireless data communication system based on GPRS network has a broad application space in communication equipment and base stations. The working principle of GPRS network and the composition of wireless data communication system need to be carried out in various aspects such as communication interface, protocol and communication strategy in the specific design process, and any design defect will affect the normal realization of wireless data communication.

refer to

[1] Liu Yuanyuan, Zhu Lu, Huang Dechang. Design of farmland environmental monitoring system based on GPRS and wireless sensor network [J]. Research on agricultural mechanization, 2013,07: 229 ~ 232.

, dragon, Jiang Guiquan. Wireless IP voice communication system based on GPRS network [J]. Computer Engineering, 20 1 1, 14: 82 ~ 84+87.

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