本論文中，我們探討正交分頻多工系統經過加成性高斯白雜訊通道下遇到脈衝雜訊(impulsive noise)對系統之影響，對此我們使用了非線性消除(Blanking nonlinearity)的方法來消除脈衝雜訊。此方法已經被廣泛應用於實際的正交分頻多工系統，以用來抑制通道傳送時所產生的脈衝雜訊，雖然非線性消除可以成功抑制脈衝雜訊但卻會造成通道載波間的相互干擾(intercarrier interference , ICI)，為了提高訊號傳送的性能，本篇論文提出了疊代干擾消除(iterative interference cancellation )的方法，來有效的抑制脈衝雜訊與減少載波間的相互干擾。 本篇論文模擬隨著改變疊代次數、載波點數、信號對噪音比以及信號對脈衝雜訊比，來觀察改變系統參數與通道環境對接收機效能之影響。 In this thesis, the orthogonal frequency division multiple (OFDM) signals with blanking nonlinearity in impulsive noise channels is presented. Blanking nonlinearity has been widely used in practical OFDM systems to suppress impulsive noise at the expense of reducing signal power and generating intercarrier interference (ICI). To improve the performance of blanking nonlinearity element, we propose an iterative interference cancellation scheme which can effectively reduce the level of ICI caused by the blanking operation at the OFDM receiver. With adaptive blanking threshold for each iteration, the proposed iterative receiver design can converge to its best performance with only three iterations. Simulation results achieved by the proposed scheme significant improvement.
