Theoretical analysis and performance of OFDM signals in nonlinear fading channels
IEEE Transactions on Wireless Communications
Transmit power adaptation for multiuser OFDM systems
IEEE Journal on Selected Areas in Communications
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In this paper, a random waterfilling power allocation is proposed for performance enhancement in clustered multiuser orthogonal frequency division multiplexing (OFDM) systems in a low SNR regime. The proposed random waterfilling increases the multiuser diversity gain so that it achieves higher throughput than static equal power allocation. The relative gain over static equal power allocation increases as the received SNR decreases. Based on an upper bound on the normalized capacity of the proposed random waterfilling derived in this paper, it is shown that the capacity grows with number of users K like O(log2 K-1/√2K-1).