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IEEE 802.16 orthogonal frequency-division multiple access (OFDMA) downlink subframes have a special 2-D channel-time structure. Allocation resources from such a 2-D structure incur extra control overheads that hurt network performance. Existing solutions try to improve network performance by designing either the scheduler in the medium access control layer or the burst allocator in the physical layer,...
In this paper, a joint channel-and-queue-aware relay selection and resource allocation scheme at the scheduling phase in an OFDMA downlink cellular network is proposed. The scheme can choose the best relay to cooperate and allocate subchannels and power for the source and the relay for the selected packet which can maximize the proposed utility function waiting in the base station. Under the premise...
The purpose of this paper is to reduce the complexity of scheduling scheme for OFDMA/SDMA system with multimedia traffic. To achieve this purpose, we propose a low-complexity beamforming-based scheduling (LCBS) scheme to solve the multi-dimensional (space, time, and frequency) radio resource allocation problem in OFDMA/SDMA systems. By utilizing a semi-orthogonal user selection (SUS) algorithm, the...
In this paper, we study the weighted sum rate (w-rate) maximization algorithms with proportional rate fairness (PRF) and delay constraints for the downlink orthogonal frequency division multiple access (OFDMA) system. First, based on the Lagrangian duality optimization tool, we design a weighted sum rate maximization scheme based on instantaneous transmit power and bit error rate (BER) constraints...
In this paper, we consider a multi-hop relay-enhanced cellular OFDMA-TDD system with the full frequency-reuse capability, in which a TDD frame can be asymmetrically divided into two different intervals, one for access link to mobile stations and the other for relay link to base station (BS)-relay station (RS) communication, while the same radio resource is fully reused by every RS in the cell. Since...
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