| Summary: | 碩士 === 樹德科技大學 === 電腦與通訊研究所 === 92 === Abstract
This thesis investigates spread spectrum technology in Code Division Multiple Access (CDMA) for wireless communication system, and applies MATLAB Simulink to simulate a part of the operation in CDMA process. In the 2G mobile communication system, the bad control of far and near power over mobile station and base station often causes the bad impression on communication. Besides, the defect in the 2G mobile communication system will cause more critical situation to the users in the high-speed standard of 3G mobile communication system, which is expanded because of the developing of internet and the requisition of communication application. This investigation also employs the features of high security and low interception of multiple encoding technology by combining the Pseudo-Noise sequence and data signal to avoid wiretap by other users in 2G communication system. The power of transmitter data signal will be decided increased or decreased to make sure that base station can receive all the CDMA encoding signal.
The demo program in MATLAB Simulink has formed the process as many function blocks to users to edit the CDMA communication system conveniently. But these convenient functions also make the system hard to understand. Therefore, this thesis also contributes to re-edit the function blocks using MATLAB Simulink in order to present the CDMA spread spectrum communication system in an easier way.
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