The Design And Implementation Of Wireless Voice Transmit System Base On TDD Mode

With the digital trunking communications constant development in our country, digital trunking terminals will gradually increase. These terminals which made by foreign manufacturers are more expensive. Therefore, it is important for the special company and department to innovate technology for wireless dispatcher's communication system base on the existing mature mobile communication products.According to the principles and characteristics of Time division duplex (TDD) mode, this thesis has introduced a scheme of wireless voice transmit terminal system based on TDD mode. The Key methods about TDD frame structure,TDD frame cycle and realization of TDD mode are described firstly. Based on these methods, the software system adopted modular design concept to describe the detailed characteristics and function of each modules, and mainly focused on implementation of each modules. Then, the text pointed out the key points of system hardware and software respectively in the debugging process.In addition, the text did a preliminary study to add a function of auto response of short message based on the short message functions owned by existing digital trunking terminal.The experimental results show that wireless voice transmit terminal system which designed in this text achieved the expected goals and implemented the functions of one-to-one private calls, one-to-many group call.