UP	Paper 1784	US-M-W	DOWN
Random Waterfilling in a Clustered Multiuser OFDM System
Choi,Eun Ho		The University of Texas at Austin
Womack,Baxter		The University of Texas at Austin
Choi,Wan		The University of Texas at Austin
In this paper, a random waterfilling power allocation is proposed for performance enhancement in clustered multiuser orthogonal frequency division multiplexing (OFDM) systems in the low SNR regime. The proposed random waterfilling increases the multiuser diversity gain so that it achieves higher throughput than static equal power allocation. The gain increases as the received SNR decreases. We also derive the upper bound for the normalized capacity of the proposed random waterfilling, which shows that the capacity grows with number of users K like O(log_2{(K-1)/(root(2K-1))}).
Eun H. Choi: Eun H. Choi received the B. Sc. degrees in Electrical Engineering from Korea University in 2001, and M. Sc degrees in Electrical and Computer Engineering from the University of Texas at Austin in 2004. He is currently pursuing the Ph.D. at the University of Texas at Austin. His research interests include the performance enhancement of various wireless systems such as orthogonal frequency division multiplexing (OFDM), and multiuser OFDM (OFDMA).