Study On Digital Wireless Voice Access System Based On DECT Technolodge

Today global mobile communication techniques are developing rapidly. New techniques and new standards are changing people's life style in an unprecedented speed and shorter renewing cycle. Among them, cordless telecommunication is especially noticeable. Cordless telecommunication used to be called as cordless telephone. The new generation of digital cordless technique can provide not only voice service, but also variety of non-voice related services. Therefore, cordless telephone is called cordless telecommunication now.Digital Enhanced Cordless Telecommunication (DECT) standard, which was instituted by European Telecommunications Standards Institute (ETSI), is an open and continuously evolving standard. DECT standard sets a cordless telecommunication framework for providing high quality voice and data services to a short distance area with high density of user. The standard aims to achieve mutual operation of equipments from different sources, provide a set of basic and advanced telecommunication services, and support multiple applications in a reasonable price.The thesis has done a detailed analysis and research on DECT protocol, particularly the Aerial Interface criterion, and formulated the Time Division Duplex communication protocol scheme based on DECT protocol model. The Time Division Duplex communication protocol scheme defined Aerial Interface, Physical layer, Medium Accessing Control layer, Data Link layer and Network layer by mainly referring to the DECT layer divide and command alternant model, and therefore is an integrated communication protocol scheme.The article further put forward a wireless voice access system scheme and designed a communication terminal by applying inexpensive Mixed Signal Processor, digital voice process module and digital wireless transmit module. At last, the article did communication protocol feasibility study on the communication terminal. At the end, implement the TDD wireless communication ,and the Portabel Termination can communite with the phone in the PSTN by the fixed Termination.