利用Histogram實現正交分頻多工系統資料輔助時間訊號同步演算法

Abstract

一個新的資料協助符號同步演算法需要完成兩個目標：有更好的穩定度和有效降低計算量。而一個直接的想法來自於訊號在時域的偏移會造成正交分頻多工系統信號中的每個子載波在星座圖上的角度偏移，這也正是此演算法的中心思想所在。再利用histogram的演算法從快速傅立葉轉換的結果中用來尋找此時域偏移以節省複雜的計算量，其中也利用許多模擬來驗證這個新的演算法的效率及可靠度。 I

A new data-aided OFDM symbol timing synchronization method is developed with two goals in mind: to achieve robust performance and to reduce computational cost. It is the intuitive observation of the relationship between the symbol timing shift and the constellation rotation on each subcarrier of an OFDM symbol from which the new method is developed. A histogram-based algorithm is used to extract the timing shift information from the FFT output. Simulations are conducted to verify the effectiveness and robustness of this new algorithm.