| Summary: | 碩士 === 中華大學 === 電機工程學系碩士班 === 90 === In a CDMA wireless mobile communication system, multiple access is achieved through the use of a specific pseudo-noise code to spread the spectrum of each user. All users within the same cell can thus share the same frequency spectrum of the radio channel simultaneously. The major influence to degrade the performance of such a system is due to the interference, which is caused by the crosscorrelations between the desired signal and undesired signals. The channel characteristics such as the multipath fading, the shadowing effect, and the path loss will make the interference even worse.
In order to overcome the interference situation of the forward link cellular wireless mobile communication system, quite a few power control algorithms are proposed. In this thesis, MATLAB simulation based on two-layer cellular signal interference is performed to analyze and compare the performance of system capacities among multiple step size power control, adaptive step size power control and SFP power control for forward link. After doing so, we can understand the optimum step size and suitable communication environment conditions of various power control algorithms.
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