Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/8766
標題: 可調整位元功率與碼重之二維光纖分碼多工系統
Two-Dimensional Optical CDMA Systems with Adjustable Bit Power and Code Weight
作者: 朱涵筠
Chu, Han-Yun
關鍵字: Code-weight variation
可變碼重
Multimedia
Optical code division multiple access
Power control
Quality of service.
多媒體
光纖分碼多工
功率控制
服務品質
出版社: 電機工程學系所
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摘要: 近年來,由於多媒體資訊傳輸技術的蓬勃發展,多樣化的通訊服務往往需同時結合數據、語音與影像等多媒體應用服務,因此如何有效運用寶貴的頻寬資源,並根據所傳輸的通訊資料型態的不同,分別提供所需的傳輸速率與傳輸品質,成為一項重要之研究課題。在本篇論文中,我們針對在多媒體光纖分碼多工系統中,如何提供不同的傳輸品質這項課題,提出了一種結合改變碼的重量以及控制傳輸位元功率之方法,並且設計一近似模型來討論這兩種方法對於系統效能表現的相互關係。在此,我們針對兩種碼重且個別擁有不同片功率的系統來做說明,其結果顯示出,雙碼重碼之服務品質可藉由控制碼重以及位元傳輸功率來達到調整的效果。最後,我們提出一流程圖,讓使用者根據其所需之系統效能或是碼的傳輸數量來選擇其碼重以及位元傳輸功率。
Since transmission technologies of variety of multimedia services, such as data, voice, video, have made great progress recently, using bandwidth efficiently and providing different transmitting rates and qualities of these multimedia services turn into an important research topic. In this thesis, we combine the methods of code-weight variation and power control in order to provide differential quality-of-service (QoS) in multimedia optical code-division multiple access. An approximation model of performance analysis is developed to investigate the interaction of both methods. For illustration, we focus our study on double-weight codes with different bit powers. Our results show that the QoS of double-weight codes can be fine-tuned by controlling both code weight and bit power. Finally, we formulate a procedure for users to select code weights and bit powers in accordance with targeted code performances or the number of transmitting codes.
URI: http://hdl.handle.net/11455/8766
其他識別: U0005-0308201017364900
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0308201017364900
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