- 學位論文
單載波區塊傳輸系統下時域預編碼與頻域接收 機設計
Design of Time-Domain Precoding and Frequency-Domain Receiver for Single Carrier Block Transmission System
摘要
單載波區塊傳送(Single Carrier Block Transmission, SCBT)系統因具有低峰均功率比(Peak-To-Average Power Ratio, PAPR)，因此成為新一代熱門之調變技術之一，漸漸取代傳統之正交分頻多工(Orthogonal Frequency Division Multiplexing, OFDM)系統，在本論文中，我們分別對SCBT系統之接收機與發射機進行研究，介紹各種不同之演算法，首先對傳統SCBT之接收機頻域等化系統進行改良，提出了決策遞迴與平行干擾消除系統以提升接收機性能，接著探討近年來很熱門之發射機預編碼系統，將傳統在接收機之訊號處理機制，移到傳送端進行訊號預處理，讓接收端架構更加簡易與接收性能更優異，預編碼系統採用污紙編碼，並且針對預編碼造成SCBT系統PAPR放大而造成系統性能衰減之問題，引入Tomlinson-Harashima預編碼機制與上三角污紙編碼系統，加以改善，最後藉由電腦模擬驗證上述之收發機系統，性能與PAPR皆獲得顯著改善。
並列摘要
Single Carrier Block Transmission system has become one of most popular modulation system due to its low peak to average power ratio (PAPR), and it gradually replaces the traditional Orthogonal Frequency Division Multiplexing (OFDM) system. In this thesis, we discuss the receiver and transmitter design of SCBT system respectively, and introduce several algorithms. First, we focus on improving SCBT frequency domain equalizer in the receiver, and we propose decision feedback equalizer and parallel interference cancellation to improve the system performance. And then, we study for the precoded system at the transmitter side, which is the popular research topic in recent years. We change the signal processing mechanisms from the receiver side to the transmitter side in order to make receiver much more simple and acquire better performance. We use Dirty Paper Coding (DPC) technique for our precoded system. However, after precoding, the PAPR of SCBT system is enhanced to degrade the system performance. Then, we introduce Tomlinson-Harashima Precoding (THP) and Upper-Triangular DPC schemes to overcome these problems. Finally, computer simulations confirm that the proposed algorithms can attain the excellent BER and PAPR performances.