Design Of Numerical Wireless Communication System Based On TDD

With the development of wireless communication, more and more mode of communication is used today. However, the mode of communication today does not satisfy the requirement of user under some environment. There's also no related communication establishment under specific environment. Some people need a convenient and portable communication establishment, for example, people worked in a very noisy workshop, electric power worker who is responsible to span antenna in open country, cooperated armed forces soldier, fireman and so on. In order to satisfy the requirement of market, I designed a practical system scheme in this paper. It can realize the point to point communication using voice within 1 kilometer among 11 users. It also can display the relative position of each user.It introduces the function of this system in this paper. It also introduces the relative theoretic: 1 voice coding technology; 2 multiaddress technology; 3modulation and demodulation technology; 4 synchronization technology. Then it introduces 9 functional model of this system:1 voice numeral module; 2 baseband module; 3 radio Frequence module; 4 MCU control module;5 data input module;6 LCD display module;7 GPS module; 8 audio frequency power amplifier modulel; 9 power supply moudule.A kind of wireless telecommunication protocol is systemically designed. And the workflow of every part of the protocol is described in detail. The protocol uses single frequency TDMA, which included 11 users and each user send the message to the system in the specific timeslot. After the machine is powered on, the synchronization is implemented by the prime number table method skillfully designed. It designed the baseband data module for transferring data using Xilinx ISE and Modelsim simulator tools in this paper and also realize the function on Xilinx XC2S100 FPGA. It described QPSK...