Dr. Ni Qiang
Note: This is a preprint of an article published in the Wiley Journal
of Wireless Communications and Mobile Computing (JWCMC), 2004, Volume 4,
Issue 5: page547 - page 566. Copyright ã 2004 John Wiley
& Sons Ltd. You can only download it freely for personal and academic
use, and please cite our paper when you use them: Accept