| Summary: | 碩士 === 國立交通大學 === 電信工程系所 === 93 === The next generation cellular mobile communication system will provide high data rate for internet and digital broadcasting. OFDM/CDMA is one of the most promising multiple access method. This thesis introduces and compares two different OFDM/CDMA systems: MC-CDMA and MC-DS-CDMA. For downlink MC-CDMA system, we design a channel equalizer to compensate the channel effect and suppress interference and noise at the receiver. There are mainly four kinds of channel matching methods: Maximum ratio combining, Equal gain combining, Zero forcing combining, and MMSE combining. We also compare the performance of these methods. We propose an improved MC-DS-CDMA system with low complexity and null interference. We use pilot based channel estimation to estimate the channel frequency response. The performance of MC-CDMA and MC-DS-CDMA is simulated by the computer under several channel models.
|
|---|
