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博士畢業生  

 

 

侯兆徽

博士論文口試時間

2006.04.28

學歷

私立輔仁大學 電子工程學士

國立中正大學 電機工程碩士

國立中山大學 電機工程博士


經歷(服務公司)


現職

高苑科技大學電子工程系副教授

博士論文題目

Analytic Models for Cellular CDMA System with Variable Code Reservation Periods and Cell Coverage


博士論文摘要

In this dissertation, we present mathematical analyses for a cellular CDMA communication system by investigating two important performance factors, the spreading code reservation periods and the cell coverage in soft handoff. First, an innovative code assignment scheme is presented by fully utilizing the characteristics of voice and data traffic. In other words, a voice terminal has higher priority to reserve a spreading code to transmit packets in multiple talk spurts, while a data terminal can only transmit packets by either employing the unassigned codes or borrowing the codes from the voice terminals during their silent periods. The code assignment scheme is then extended to analyze a priority-based CDMA system where the code reservation periods can be varied. Two performance measures, the average dropping probability for delay-sensitive traffic and the average packet delay for delay-insensitive traffic, are derived from the analytic models based on the equilibrium point analysis (EPA). Finally, for the cellular CDMA system, we study the influences of enlarging or shrinking the soft handoff coverage on the new-call blocking and the handoff-call dropping probabilities. From the mathematical analyses, we reveal that enlarging the outer cell while fixing the inner cell may significantly increase both blocking and dropping probabilities. On the other hand, if we enlarge the inner cell and fix the outer cell, the two probabilities can be reduced slightly. The impact of activating a call admission control on the proposed cellular CDMA system is also discussed.

Keywords CDMA , Code Assignment , Integrated traffic , Priority , Soft handoff , Cell coverage , Blocking , Dropping , Markov model , and Wireless communications.

 

Publication List

Journal Papers:

1. Tsang-Ling Sheu and Jaw-Huei Hou, "An Integrated CDMA Code Assignment Model for Voice and Data Traffic in Wireless Communications," IEEE Transactions on Wireless Communications , Vol. 4, No. 2, pp. 528-537, Mar. 2005.

2. Tsang-Ling Sheu and Jaw-Huei Hou, "On the Influences of Enlarging and Shrinking the Soft Handoff Coverage for a Cellular CDMA System," Journal of Information Science and Engineering (JISE), accepted to appear.

3. Tsang-Ling Sheu and Jaw-Huei Hou, "An Analytical Model of Cell Coverage for Soft Handoffs in Cellular CDMA Systems," GESTS Int'l Transactions on Computer Science and Engineering , Vol. 18, No. 1, pp. 209-223, Oct. 2005.

4. Tsang-Ling Sheu and Jaw-Huei Hou, "A Priority-based CDMA System with Variable Code Reservation Periods for Multiclass Traffic," IEE Proc. Commun. , accepted to appear.

 

 

Conference Papers:

1. Tsang-Ling Sheu and Jaw-Huei Hou, "A Code Assignment Scheme for CDMA Wireless Networks with Integrated Voice and Data Traffic," IEEE/IEE Int'l Conference on Telecommunications (ICT), Tahiti , Feb. 2003.

2. Tsang-Ling Sheu and Jaw-Huei Hou, "Coverage Area Analysis of Soft Handoff on Cellular CDMA Systems," 10th IFIP Int'l Conf. on Personal Wireless Communications (PWC), Colmar , France , Aug. 2005.

 

 

畢業感言

經過這些年來默默的辛苦耕耘,甜美的果實終於呈現在眼前,我畢業了!此時心中的喜悅,實在無法以筆墨形容。回想這幾年的求學路,從初期研究方向的確立,到終於能發表研究成果,其中數不清的挫折及巨大的壓力常讓我幾乎喘不過氣,還好師長、同學的鼓勵及永不放棄的信念讓我達到目標。所以記得多與老師、同學、學長、學弟討論,研究解決問題的方法,堅持到底,不要因一時的挫折或沮喪而輕易放棄理想。一旦你破繭而出時,一切的辛苦都是值得的。



E-mail

houjh@cc.kyu.edu.tw

電話

0931897062

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