A Study on Downlink Receiver Design for OFDM/CDMA-based Mobile Communication System

• Main Authors: Mei-Ling Wang, 王玫玲
• Other Authors: Chia-Chi Huang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/74871413452559167125

碩士 === 國立交通大學 === 電信工程系 === 90 === The next generation cellular mobile communication system will provide high data rate for internet service. One of the most promising multiple access methods in the next generation system is the OFDM/CDMA. This thesis proposes an OFDM/CDMA downlink baseband receiver architecture for high data rate transmission and discusses the system performance. This receiver architecture includes a baseband signal detection and a channel estimation. We use a pilot signal to estimate the channel. For signal detection, we design a channel equalizer and a signal decision method. The channel equalizer has five methods: Maximum ration combining, Zero forcing, Partial equalizer, MMSE(Minimum mean square error) and Equal gain combining. The performances of these five kinds of channel matching methods are shown in the thesis. Furthermore, we use a pilot signal with FFT based matched filters and moving average unit to estimate channel response. We also compare the OFDM/CDMA downlink baseband receiver architecture with a CDMA downlink baseband receiver architecture. The performance of the systems are simulated by computer under several channel models.