Channel Estimation and Equalization for Transmitted-Reference Ultra-Wideband Systems

• Main Authors: Wen-Sheng Hua, 華文聖
• Other Authors: Ming-Xian Chang
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/81090277112677977815

碩士 === 國立成功大學 === 電腦與通信工程研究所 === 96 === Transmitted-reference (TR) signal is popularly used for ultra-wideband (UWB) systems recently. The main reason lies in the consideration in the receiver. Because it is not like Rake receiver, which needs a large amount of taps, and perfect timing and channel estimates in the receiver. Therefore, the complexity of the TR-UWB system is relative lower, and more feasible. For the ultra-wideband system with TR (TR-UWB), the receiver could readily estimate the channel state information from the TR. But for the typical TR-UWB system, we need to transmit a large number of TR signals in order to obtain better system performance, and this reduces data transmission rates of the system. In this thesis, we first study the general TR-UWB system. Then we propose several approaches of recursive channel estimation and maximum-likelihood (ML) clustered channel estimation, such that we could obtain better performance using the same amount of TR. In addition, we consider single-carrier (SC) block transmission systems. To remove the inter-symbol interference (ISI), we use long enough guard interval (GI) and the low complexity frequency-domain equalization. Finally, we apply the method of recursive channel estimation to the SC block transmission with frequency-domain equalization.