| Summary: | 碩士 === 中華大學 === 電機工程學系碩士班 === 90 === Recently, the number of mobile communication users is continuously increasing. Therefore, the bandwidth efficiency and higher communication quality have become more important issues nowadays. The receiving system employing smart antennas could acquire good results both in system capacity and power control.
In this thesis, we study the receiving system with smart antennas for WCDMA wireless communications. Five algorithms will be used, which include (1) maximum output power without Lagrange multiplier, (2) maximum SINR output with eigenvector solution, (3) maximum SINR output without eigenvector solution, (4) simplified smart antenna based on maximum SINR output without eigenvector solution, and (5) normalized least mean square algorithm. By investigating their respective influence, we are able to analyze the receiving system with smart antennas, and to pick out the optimum algorithm, which will yield the best performance and the highest system capacity.
Our simulation results show that under 100km/hr vehicular speed, algorithm 3 is the best, followed by algorithm 5 or 4, with algorithm 2 the worst. Meanwhile, algorithm 3 requires the most amount of computation, followed by algorithm 2. Overall speaking, each of the five algorithms, when combined with the smart antenna system, will be able to raise the system capacity.
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