Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/8501
標題: 在多速率及多媒體光纖分碼多工系統之頻寬效益分析
Spectral Efficiency Analysis of Multirate, Multimedia Optical CDMA Systems
作者: 陳鴻瑋
Chen, Hung-Wei
關鍵字: Multicode keying;多碼鍵移;optical code division multiple access;spectral efficiency;multilength codes;光纖分碼多工系統;頻寬效益;多碼長
出版社: 電機工程學系所
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摘要: 
在光纖分碼多工系統中有許多多速率的技術用來支援多媒體的服務,例如多重碼和多碼鍵移的方法。在多重碼的方法中,每個用戶在同個時間中傳輸多個碼來代表多個傳輸的資料。然而同時所傳輸碼的數目與資料的速率有關。而相對於多碼鍵移的方法,多碼鍵移方法只在同一時間傳輸單一個碼,而每個碼用來表示帶有數個位元資料的符元。資料的速率可以透過改變符元的大小來改變傳輸資料的位元數,在這篇論文中,這二種非同步技術的頻寬效益分析被推導出來用來做為效能與效益的整體比較,而傳統的單速率開關鍵移方法的頻寬效益分析用來做為比較的基礎。實驗結果顯示出多重碼方法的頻寬效益比傳統的單速率開關鍵移方法好,而多碼鍵移的方法的頻寬效益在某些情況下比傳統的單速率開關鍵移方法來的好。
近年來在光纖分碼分工系統中,除了多重碼及多碼鍵移的方法之外,多碼長方法用來傳輸多速率和多媒體的服務。在多碼長方法中,利用指定每個用戶不同碼長來達到提供不同傳輸速率的通訊服務,例如,較長的碼用來做為較慢速率的傳輸,較短的碼用來做為較快速率的傳輸。在這篇論文中,多碼長的頻寬效益分析被推導出來用來做為效能與效益的整體比較,而傳統的單速率開關鍵移方法的頻寬效益分析用來做為比較的基礎。在某些情況下,多碼長方法比傳統的單速率開關鍵移方法有較好的頻寬效益而且能夠支援更多同時使用的用戶數,就不管是頻寬效益或是效能來說,多碼長方法能夠利用支援較多高速率的用戶數來得到較多的好處。

Multirate transmission techniques, such as multiple-code (MC) and multicode-keying (MK) schemes, have been proposed for asynchronous optical code-division multipleaccess
(O-CDMA) systems supporting multimedia services. A user in the MC scheme transmits several codes at the same time to represent the transmission of several data bit ones. The number of parallel codes transmitted at a time is proportional to the user's bit rate and the number of data bit ones. While the MK scheme only transmits one code at a time, each code represents a symbol and each transmitted symbol represents multiple data bits. Data rate is varied by changing the symbol size, which, in turn, changes the number of data bits per baud, similar to MODEM communications. In this dissertation, the spectral efficiencies (SEs) of these two asynchronous schemes are
derived for the comparison of their performances and efficiencies as a whole. The SE of the conventional single-rate on-off-keying (OOK) O-CDMA scheme is also derived for
a baseline comparison. Our numerical results show that the MC scheme always has a better SE than the single-rate OOK scheme, while the MK scheme can have a better SE than the single-rate OOK scheme under certain conditions.
Besides the MC and MK schemes, a “multilength transmission scheme has also been proposed for O-CDMA system supporting multirate, multimedia services. In this scheme, data rate is dynamically matched to the users' needs through the assignment of codes of different lengths, such that longer-length codes are used for slower-rate transmission and shorter-length codes are for a faster-rate transmission. Also in this dissertation, the SE of the multilength scheme is derived and compared to the conventional singlelength
OOK O-CDMA scheme. The multilength scheme is found to support larger SE and total number of simultaneous users than the single-length scheme under certain conditions. Our study also shows, for the first time, that the multilength scheme gets more benefit, in terms of both SE and performance, from supporting more number of high-bit-rate (also higher priority) services than low-bit-rate ones.
URI: http://hdl.handle.net/11455/8501
其他識別: U0005-1407200919323100
Appears in Collections:電機工程學系所

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