同時應用組合法與重排前導信號位置降低移動式微波存取全球互通系統帶外功率之研究

The Study of Out-of-Band Power Emission by Relocating pilots and Hybrid Approach in Mobile WiMAX

陳世峰(Shih-Feng Chen)

指導教授 ： 許超雲

大同大學/電機資訊學院/通訊工程研究所/碩士(2012年)

摘要

近年來隨著行動裝置使用的需求日益增加，行動通訊的能力也備受考驗，而移動式無線寬頻技術是目前常用的寬頻技術的一種。正交分頻多工系統是一種多載波調變技術，但也存在著帶外功率散逸的問題，許多研究提出降低帶外功率散逸的方法，如尾隨平滑法、強迫為零法、插入消除在載波法、訊號空間擴散法以及組合法。本論文將提出重排前導信號位置的方法來降低帶外功率，將原始訊號在尚未結合組合法前，先降低原始訊號的帶外功率後，再與組合法做結合應用於移動式微波存取全球互通系統上，模擬結果將進行比較，並討論其結果與差異性，提出較佳的方法應用於行動裝置上。

關鍵字

重排前導信號 ； 帶外功率散逸

並列摘要

With the increasing demand of mobile devices, the ability of mobile communications is still under test, the Mobile WIMAX technology is currently one of the most common broadband technologies. The orthogonal frequency division multiplexing is a multi carrier modulation technique for high data rate transmission; however it goes along with the problem of out-of-band power emission. There are many methods, proposed in many studies, to lower down the out-of-band power emission, such us Tail-Tracking, Zero-Forcing, Cancellation Carrier Insertion, Constellation Expansion, and Hybrid-approaches. In this thesis we present the method of relocating pilots on the Mobile WiMAX to lower down the out-of-band power emission, and combine with the Hybrid approaches to compare the simulation results. Propose a better solution to apply on the mobile devices.

並列關鍵字

Out-of-band Power emission ； relocating pilots

參考文獻

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[13] IEEE 802.16-2009, “Local and Metropolitan Networks -- Part 16: Air Interface for Broadband Wireless Access Systems,” 2009.

[1] Y. S. Ji, “The reduction of out-of-band power emission in OFDM,” M.S. thesis, Institute of Communication Engineering, University of Tatung, Jul. 2005.