Optimal Power Allocation for Parallel Access Multiuser Scheduling

TitleOptimal Power Allocation for Parallel Access Multiuser Scheduling
Publication TypeConference Paper
Year of Publication2007
AuthorsMa, Y., D. Zhang, and R. Schober
Conference NameGlobal Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Pagination2992 -2996
Date Publishednov.
Keywordsdiversity reception, equal power allocation, fading channels, generalized fading channels, generalized selection multiuser diversity, multi-access systems, optimal power allocation, orthogonal parallel-access scheduling schemes, scheduling, signal-to-noise ratios, water-filling power allocation
Abstract

In this paper, we study the optimal power allocation for orthogonal parallel-access scheduling schemes. We propose and study a parallel access scheme called generalized selection multiuser diversity (GSMuD), which ranks the channels of a total of L users and selects the L c users with the largest signal-to-noise ratios (SNRs) for channel access. Besides the equal power allocation (EPA), two optimal power allocation algorithms are designed for the selected users in the GSMuD, namely (i) one- dimensional (1-D) optimal waterfilling (WF) power allocation along the channels given a fixed total power at each time slot; and (ii) two-dimensional (2-D) optimal WF along both the time and the channels given a fixed average total power. Accurate performance analyses of the above schemes are provided. Numerical results show that the 2-D WF power allocation yields the largest sum rate, while the EPA is near-optimal for many cases of practical interest.

URLhttp://dx.doi.org/10.1109/GLOCOM.2007.567
DOI10.1109/GLOCOM.2007.567

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