Energy-efficient resource and power allocation for uplink multi-user OFDM systems

Khakurel, Suman and Musavian, Leila and Le-Ngoc, Tho (2012) Energy-efficient resource and power allocation for uplink multi-user OFDM systems. In: Personal Indoor and Mobile Radio Communications (PIMRC), 2012 IEEE 23rd International Symposium on. IEEE, pp. 357-361. ISBN 9781467325660

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In this paper, we consider the problem of energy-efficient resource and power allocation in the uplink of multiuser multi-channel Orthogonal Frequency Division Multiplexing (OFDM) based systems subject to constraints on user equipment (UE) transmit power. This problem is non-deterministic polynomial-time hard and an optimum solution for a system with U users and N resource units requires a complexity of at least O(NUN). Using an iterative solution approach, we propose two sub-optimal, yet efficient, scheduling algorithms that maximize the energy efficiency (EE) considering both UE circuit power (Pc) and rate-dependent transmit power with an upper limit of Pmax. Simulation results show that the proposed algorithms provide near-optimal solutions with much lower computational burden of O(UN) and O(UN2/2). Further performance studies indicate that the proposed algorithms can offer an EE of more than 2 times with a throughput reduction of less than 13% as compared to the spectral-efficient greedy algorithm. Our studies also reveal that the EE is quickly increased with Pmax when ≪ Pc and then reach saturation as Pmax approaches Pc.

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26 Dec 2012 15:15
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21 Sep 2023 03:46