Research On Wireless Data Transmission Based On Forward Error Correcting Technology

Tightly combined with the development of technologies of microelectronics, radio engineering and digital communication, the technology of wireless data transmission came into being. Compare to wire transmission, the wireless data transmission has many advantages. With this technology, the dependence on wire net is greatly decreased and people leave out the trouble of laying out the wire. Technology of wireless data transmission is one of the important development tendencies of wireless communication technology. Around the topic of wireless data transmission technology, the main contents of this thesis with the relevant conclusions are as follows:In chapter 1, firstly the development of communication technology is discussed, then the status and development tendency of wireless data transmission technology at domestic and abroad is analyzed, and come to a conclusion that using VLSI, technology of wireless digital communication and technology of error-correcting is the developing tendency of wireless data transmission technology, also the significance and the contents of the thesis are put forward.In chapter 2, firstly the basic principle of the system of wireless data transmission is analyzed. Then the hardware design and implementation of the functional modules are discussed in detail. Lastly the hardware methods of anti-disturbance are given, and entirely finished the hardware design of the system of wireless data transmission based on VLSI and technology of digital communications.In chapter 3, the software design of the system of wireless data transmission is provided;the program is coded with the C language that has many advantages such as modularization, structurization, easily implementation the control algorithm and good flexibility. According to actual system requirements and experiments, the communication protocol isprovided, using OxFF and 0x00 as the data head is a good solution to the disturbance of CC1000 in sending and receiving signals. Lastly the flowcharts of functional modules are given, and entirely finished the software design of the system of wireless data transmission.In chapter 4, according to the relative theory of the antenna and the circuit theory, the parameters of electric characteristic and the impedance matching of the single antenna is introduced, also the formulas of the single antenna' s communication range are given. With the actual parameters of single antenna, the communication distance of the system of wireless data transmission is calculated, and with experiments, the actual communication distance of the system of wireless data transmission is given.In chapter 5, firstly the theory of the BSC and GBSC channel models are presented. Then with experiments, the BSC and GBSC models of the system are established, and come to a conclusion that GBSC model is more suitable to describe the system' s channel model. The established GBSC model gives a design principle of error-correcting system in the next chapter.In chapter 6, firstly according to the analysis results of the GBSC model established in chapter 5,the Reed-Solomon code is selected. The experiments proved that the Reed-Solomon code has very high performance of error-correcting and the anti-disturbance performance of the system is greatly improved.In chapter 7,a brief summary on the five main topics in this thesis is provided, and some conclusions are drawn;also some researches that need to do by next step are analyzed.