| Summary: | 碩士 === 國立清華大學 === 通訊工程研究所 === 97 === In the near future, there will appear a strong demand for low-cost high-speed wireless technology for short-range communications. One very promising technology for such demand is called ultra-wideband (UWB). Owing to its ultra-wide bandwidth, a UWB system has potential advantages over conventional systems, such as robustness to multipath fading, coexistence with other systems using the same band, high data rate capability, and fine time resolution.
As a low-complexity alternative to conventional locally-generated reference schemes, the transmitted-reference (TR) signaling has been gaining increasing popularity and interests among academia and industry. The TR system has a reference signal transmitted along with the data, which eliminates the need for channel estimation and stringent acquisition. Hence, only a simple autocorrelation receiver is required for data detection.
In this thesis, we pursue a generic framework for a comprehensive study of performance analysis for TR-UWB systems. Even though there were related works in the literature on TR-UWB systems, exact results which can precisely capture realistic UWB channel statistics are still missing. We conduct exact evaluation of the signal-to-interference-plus-noise ratio (SINR) for TR systems over the channel structure adopted by the IEEE 802.15.3a Task Group which can describe various realistic UWB channel phenomena. Large pulse separations are assumed so that inter-pulse, inter-block, and inter-symbol interferences can be ignored in order to reach useful closed form results. System optimization, e.g., finding the best mean channel energy capture ratio for optimal SINR, and the performance comparison among different TR systems are then carried out. Compared with the previous methodology which requires extensive simulations, our analytical results can provide a more efficient and insightful way to receiver design and optimization.
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