By year

Xiyan Ma, Yi Wu, Zhisheng Niu, Tamio Saito, Performance Analysis of the Packetized Voice Transmission with PCF in an IEEE 802.11 Infrastructure Wireless LAN, Proceeding of Asia Pacific Conference on Communication (APCC 2003), vol. 2, pp. 571-575, Sep. 2003, Penang, Malaysia.
Xiang Duan, Xiyan Ma, Zhisheng Niu, Junli Zheng, Analysis of Wireless Transmission Efficiency and Its Application: Efficiency-Based Adaptive Coding, Proc. IEEE 14th Int. Symposium Personal, Indoor and Mobile Radio Commun. (PIMRC'2003), Sept. 2003, Beijing, China.