應用於短距離高速無線通訊之傳送端前置等化器

Abstract

本論文旨在簡化應用於高速短距無線通訊系統中的接收端架構。我們提供一個在傳送端解決多路徑干擾問題的方法。我們設計一個多路徑處理器以量測多路徑衰降的係數並且估測對傳送信號的ISI。根據已經估測的ISI，我們修改傳送信號的振幅，使接收信號與傳送信號有相同的極性以及數量。當ISI和傳送信號有同的極性時，我們可以適當修改臨界值以節省傳送能量。此外，因為在傳送端做等化，我們可以事先知道後續傳送信號的資訊。因此當目前傳送信號所產生的ISI和後續傳送信號有同的極性時，我們可以進一步修改臨界值以節省更多的傳送能量。因為在傳送端做了等化，因此接收機變得非常簡單。最後，我們提出系統的效能分析並討論此系統的相關問題。

The purpose of this thesis is to simplify the receiver structure in high-speed short-range wireless communications. We develop solutions to deal with multipath problem at the transmitter (TX). A multipath processor (MP) is designed to measure the multipath coefficients and estimate the amount of possible ISI on the transmitted signal. According to the estimated ISI, we modify the transmitted signal amplitude to make the received signals with desired polarity and magnitude. For saving transmitted power, we can modify the threshold significantly while ISI and the current data have the different polarity. By doing pre-equalization at TX, the information of the upcoming data could be known in advance. We could also modify the threshold for saving more power by considering this information. Because equalization is done at TX, the receiver structure can be rather simple. We present the system performance analysis and discuss related issues of this system.