| Summary: | 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.
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