符合IEEE802.16e都會區域網路傳輸系統的框同步技術研究

Abstract

摘要

WiMax主要是由IEEE 802.16e的規格來實現，它利用OFDM的技術來傳送資料，可把資料傳到30哩外，並涵蓋半徑一哩內的範圍。IEEE 802.16e是802.16-2004架構的延伸，支援定點或移動環境的傳輸。 OFDM的系統性能對時間與頻率的同步非常敏感，不同步的情況會造成系統效能嚴重的衰減。本篇論文針對IEEE 802.16e 都會區域網路(WiMax)的碼框同步，提出一個低複雜度的演算法，並與Schmidl & Cox的方法在複雜度與系統效能上分別在AWGN及具有移動性以及靜止的多重路徑環境下做一比較 。電腦模擬結果顯示新的演算法的確是簡單而且有效。

WiMax is realized by the specification of IEEE 802.16e.It can transmit data over 30 miles and contain the range within 1 mile radius .The transmission system is implemented by OFDM technique. IEEE 802.16e is the extension of 802.16-2004 structure,which supports both fixed position and mobile transmission environments. OFDM system is very sensitive to the timing and frequency errors,the effect of timing and frequency error will degrade the system performance seriously.In this paper,a low-complexity algorithm for the frame synchronization of IEEE 802.16e WiMax is proposed.The proposed method is compared with the method proposed by Schmidl and Cox’s in AWGN,mobile,and static mutipath channel，respectively.Simulation results also show that the proposed method can be implemented efficiently with lower complexity.