Adaptive Resource Allocation in Multiuser OFDM Sys
2016-08-23
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Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique for
achieving high downlink capacities in future cellular and wireless LAN systems. The sum capacity
of MU-OFDM is maximized when each subchannel is assigned to the user with the best channel-tonoise
ratio for that subchannel, with power subsequently distributed by water-filling. However, fairness
among the users cannot generally be achieved with such a scheme. In this paper, we impose a set of
proportional fairness constraints to assure that each user can achieve a required data rate, as in a system
with quality of service guarantees. Since the optimal solution to the constrained fairness problem is
extremely computationally complex to obtain, we propose a low-complexity suboptimal algorithm that
separates subchannel allocation and power allocation. In the proposed algorithm, subchannel allocation
is first performed by assum
achieving high downlink capacities in future cellular and wireless LAN systems. The sum capacity
of MU-OFDM is maximized when each subchannel is assigned to the user with the best channel-tonoise
ratio for that subchannel, with power subsequently distributed by water-filling. However, fairness
among the users cannot generally be achieved with such a scheme. In this paper, we impose a set of
proportional fairness constraints to assure that each user can achieve a required data rate, as in a system
with quality of service guarantees. Since the optimal solution to the constrained fairness problem is
extremely computationally complex to obtain, we propose a low-complexity suboptimal algorithm that
separates subchannel allocation and power allocation. In the proposed algorithm, subchannel allocation
is first performed by assum
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