- 學位論文
多輸入多輸出技術於多頻帶正交分頻多工超寬頻通訊系統之應用研究
A study on the application of MIMO technique to MB-OFDM UWB communication systems
摘要
本論文依據超寬頻通訊系統中之多頻帶正交分頻多工（MB-OFDM）標準，提出兩種創新的多輸入多輸出-多頻帶正交分頻多工（MIMO-MB-OFDM）架構，並探討MB-OFDM在加入多輸入多輸出（MIMO）技術後能獲得那些利益。 我們首先建構MB-OFDM系統，以供MIMO-MB-OFDM系統比較效能之基準，接著提出兩種MIMO-MB-OFDM之新架構：塊狀時空碼-多頻帶正交分頻多工（STBC-MB-OFDM）與摺積碼-塊狀時空碼-多頻帶正交分頻多工（CSTBC-MB-OFDM）。模擬結果顯示，2I2O STBC-MB-OFDM系統能以較低之複雜度獲得兩倍於MB-OFDM之傳輸速率，CSTBC-MB-OFDM系統則可在非常低之SNR值中達到 之效能。因此，MIMO技術於MB-OFDM系統之應用確實可行，而且極具潛力。 最後，本論文也提出一種多配對天線-多頻帶正交分頻多工（MPA-MB-OFDM）架構，經推導可知，使用多工編碼的MPA-MB-OFDM系統可在M倍複雜度下，以相同錯誤率得到M倍於MB-OFDM之傳輸速率，因此，MPA-MB-OFDM系統亦具可行性。
並列摘要
This study presents two novel MIMO-MB-OFDM systems based on the latest UWB proposal. The benefits that the MB-OFDM system can gain by incorporating MIMO technique are also explored. First, an MB-OFDM system is constructed as a baseline for performance comparison. We next propose two novel MIMO-MB-OFDM systems, which include STBC-MB-OFDM and CSTBC-MB-OFDM. Simulation results show that the 2I2O STBC-MB-OFDM can achieve two times the transmission rate of the MB-OFDM with lower complexity and the CSTBC-MB-OFDM can yield bit error rate of with very low SNR. Therefore, this research verifies the applicability and potential of MIMO to MB-OFDM system. Finally, an MPA-MB-OFDM system is also proposed. Derivational results indicate that the MPA-MB-OFDM is able to acquire M times the transmission rate of MB- OFDM at the expense of M times complexity while maintains the same bit error rate.