| Summary: | 碩士 === 中華大學 === 電機工程學系碩士班 === 87 === Following the rapid progress of wireless communications and the massive demand of multimedia services, a kind of transmission scheme called CDMA-OFDM systems has gained much attention. It is mainly because CDMA-OFDM systems can mitigate multipath fading and provide high frequency diversity in wireless transmissions.
In this thesis, we investigate the performance of different detection methods for CDMA-OFDM systems and the performance of different multiple access system structures: CDMA-OFDM, TDMA-OFDM, and conventional DS-CDMA. Simulation results show that CDMA-OFDM systems can really have an acceptable performance without too much complexity and have a higher capacity than conventional DS-CDMA systems. Moreover, we also simulate the performance of different square Q-ary (8,16,64,256) signals for CDMA-OFDM systems such that we can take these results as a reference for adaptive modulation applications.
|
|---|
