A Study of SFH OFDM MA System in Fading Channel

• Main Authors: Han-Chiau Tsai, 蔡函橋
• Other Authors: Li-Der Jeng
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/39107517316202241902

碩士 === 中原大學 === 電子工程研究所 === 96 === In this thesis, direct sequence slow frequency-hopping space-time block coded orthogonal frequency division multiplexing (DSSFH STBC OFDM) system is proposed, both multiple access interference (MAI) and Rayleigh fading are considered. It has been shown that spreading spectrum (SS), frequency hopping and diversity combining techniques are efficiently to combat MAI and fading. We consider different diversity combining methods in our system: maximum ratio combining (MRC), equal gain combining (EGC) and two training sequence methods. The proposed system assumes that the channel state information (CSI) is available for decoding process. In order to estimate the CSI, this thesis proposes two train sequence methods. Finally, the performance comparison of different diversity combining methods is shown in the simulation results.