Based On TD-SCDMA Wireless Fixed Terminal System Design And Implementation

TD-SCDMA is the ITU released the third generation mobile communication space of the interface specification, which uses a smart antenna, joint detection, synchronous CDMA, software radio, low chip rate, multi-slot, variable expansion frequency systems, adaptive power adjustment and other advanced technologies. With the start of TD-SCDMA networks, TD-SCDMA will also be a comprehensive business development.3G fixed wireless access terminal came into being, it can not only use in the home, and can be used in a number of special areas, such as in remote mountainous areas, islands, border posts and other cable network has not been fully covered or not covered by the place. Therefore, The 3G TD-SCDMA-based fixed wireless access terminal has a great value and market prospects. At present, most cities have launched TD-SCDMA wireless fixed-line business, its fixed-line rates standards are even cheaper than the traditional.Wireless fixed terminal in the field of modern wireless communication plays an increasingly important role, as operators and user groups occupied a key factor in profitability, and thus the fixed wireless terminal market has become the modern communications industry, competition between operators, the main businesses. Fixed wireless terminal is the most important in this business, the fundamental core of the wireless communication is a fundamental part of the wireless terminal. As wireless fixed terminal operators in the communications market and market segments occupy an increasingly important role, for the application of operations research work is also increasingly active.In recent years, operators, and various communications companies have done a lot in the wireless fixed terminal specification and practical application case, put forward many new ideas and new methods, although these methods have a good theoretical basis and practical application, and a large number of case results, but cost control has some drawbacks, which limits the promotion of their use.This minimum cost to build a fixed wireless terminal system as the goal, focus on achieving agreement through the software problem fixed wireless terminals to realize the TDS-CDMA and GSM dual mode, the network set up the server and the terminal itself, to achieve locking, lock card, lock cell frequency, encryption card consolidated. This involves encryption card, TDS-CDMA and GSM network communication protocol, SIM and USIM and other fields of technology agreement, the main research work can be summarized as follows:1. the fixed wireless terminal designed system architecture, relying on a generic wireless terminals to the corresponding technical specifications as a means to a fixed wireless terminal into the object.2. developed a machine locks, card locks machine, interlock machine cards, card terminals interlocking achieved to solve the set of Pirates of the card stolen machine machine problems;3. design a special encryption card encryption and authentication processing sub-systems, cards and terminals built encryption encryption and authentication integration of interactive integrated processing system.4. TD-SCDMA network for frequency locking under question. Locked GSM network status using cell analysis method, based on the GSM cell and then lock locking points according to district information algorithm, effectively eliminates the TD-SCDMA networks are not really locking point of the next issue, greatly enhancing the lock area frequency precision, while the probability of false lock.Real network environment and end the system more complex and more various uncertainties, the results of this study is also in the practical application of the satisfactory results achieved.