ZONG-YI CHEN1, JIUNN-TSAIR FANG2, YEN-CHUN LIU1 AND PAO-CHI CHANG1
1Department of Communication Engineering
National Central University
Taoyuan City, 320 Taiwan
2Department of Electronic Engineering
Ming Chuan University
Taoyuan City, 333 Taiwan
E-mail: pcchang@ce.ncu.edu.tw