正交分頻多工系統(OFDM)在抗多路徑寬頻無線傳輸方面具有極佳的優異性，且具有極高之頻譜使用效率，因而普遍為先進寬頻無線通訊規格所採用，例如WLAN、DAB、DVB-T/H、WiMax及UWB等，其缺點為對於系統線性度及載波頻率同步要求高。OFDM系統的高頻譜使用效率源自於多載波間的正交性，然而當接收者或傳送者高速移動時，時變的通道響應將破壞其正交性而導致傳收性能嚴重地下降，其程度正比於移動速度及載波頻率。由於下世代寬頻無線通訊的主要發展方向為朝高移動速率與高資料率之傳收，因此提出本計畫以進行此方面之研究構想，計畫內容將探討使用多輸入多輸出(多天線傳收)OFDM訊號在高速移動環境下之傳收同步與其通道估測/等化問題，並尋求其解決方法，特別之處在於採用符合電磁波物理傳輸現象以建立出相關聯近距離多天線間移動傳收通道模型。 OFDM systems are advantageous in combating multipath broadband wireless communications and spectral utilization efficiency, and therefore have been adopted in advance broadband wireless communication standards such as WLAN, DAB, DVB-T/H, WiMax, UWB et al. The drawback of OFDM systems is on the high demand regarding to system linearity and carrier frequency synchronization. The spectral efficiency of OFDM comes from the orthogonality between multicarrier, however the time-varying channel response caused by high mobility of transmitter or receiver will seriously degrade the performance by destroy the carrier orthogonality. The performance degradation is proportional to the speed and carrier frequency. Since high mobility and high data rate are both demanded by next generation broadband wireless communications, we therefore propose this research project with a goal studying the synchronization and channel estimation/equalization of MIMO-OFDM in high mobility environment and finding corresponding solutions. The speciality of this project is the utilization of a physical sense MIMO channel model which could describe correlated channels between close antennas in mobile environment. 研究期間：9608 ~ 9707
