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Proceedings Paper

An analysis of multimedia traffic transmission over OFDM wireless channel
Author(s): Wenwu Meng; Guangxi Zhu; Xuemin Shen; Jun Cai
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Paper Abstract

With the rapid growth of wireless access to the Internet, there has been an increasing demand in providing high data rate real time traffic such as audio and video over wideband wireless channels. However, the transmitted multimedia traffic experience frequency-selective fading in wideband wireless channels. By dividing the wideband channel into several smaller sub-channels and sending multimedia traffic in parallel orthogonal sub-channels, which is widely known as orthogonal frequency division multiplexing (OFDM), the frequency-selective channel can be transformed into a set of frequency-flat channels. In this paper, we analyze the effect of sub-carrier assignment on the transmitted multimedia traffic. By increasing the number of sub-carriers, each sub-channel behaves practically as a quasic-static one, such that frequency-selective fading and intersymbol interference (ISI) can be alleviated. Sub-carrier assignment is thus important for multimedia applications. The multiplexing of sub-carriers is introduced to combat the variability of wireless channel, but the performance of wireless channel would also be degraded. We present a quality assessment of audio and video traffic over OFDM wireless channel based on sub-carrier assignment. Simulation results show that proper sub-carrier assignment could significantly reduce errors during high rate multimedia transmission.

Paper Details

Date Published: 4 January 2006
PDF: 5 pages
Proc. SPIE 5985, International Conference on Space Information Technology, 59850H (4 January 2006); doi: 10.1117/12.655683
Show Author Affiliations
Wenwu Meng, Univ. of Waterloo (Canada)
Guangxi Zhu, Huazhong Univ. of Science and Technology (China)
Xuemin Shen, Univ. of Waterloo (Canada)
Jun Cai, Univ. of Waterloo (Canada)

Published in SPIE Proceedings Vol. 5985:
International Conference on Space Information Technology
Cheng Wang; Shan Zhong; Xiulin Hu, Editor(s)

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