Study On Wireless Data Transmission Based On Analog Trunking Communication System

The analog trunking communication systems with protocol of MPT1327 have been used in a large of special departments, such as police, army, which has taken an important role in the needs of communications, dispatching and commanding for many years.With the increase of needs, the policemen working in the front are eager to obtain the data information, such as the number or license of cars, ID card, information of the criminals timely and exactly. Nevertheless, the analog trunking communication systems nowadays are not satisfied with the users because of its data transmission rate being below 4.8kb/s.The wireless high-speed data transmission system is designed basing on above situation. The data transmission rate is up to 9.6kb/s in the CKT2000 trunking communication system by the wireless high-speed data transmission circuit board designed and the TK-868 and the TKR-850 reformed.Based on the analysis to the architecture of current trunking communication system, a general design of high-speed data transmission system is presented in this thesis. The architecture, principle, and function features are also described. The hardware and the software about MX909 is the core of the task. In this thesis, the technology of GMSK, CRC, FEC, interleaving, scramble and de-scramble is introduced in detail. What is the function of the MX909's register and how to use them are expatiated detailedly at the same time. To accomplish the task, a great deal of experiments have been done. The possibility of wireless high-speed data transmission in the recent trunking communication systems is proved by the block diagrams of the experiment circuits being given and the experimental results being analyzed theoretically. The data transmission rate will be increased to a large extent due to the advanced modulation in the task. The technique being used in practice will be useful in terms of economic and social aspects.