A multidimensional resource-allocation optimization algorithm for the network-coding-based multiple-access relay channels in OFDM systems

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Abstract

Joint scheduling and resource allocation in uplink orthogonal frequency-division multiplexing (OFDM) systems is complicated and even becomes intractable with a large subcarrier and a large user number. This paper investigates the resource allocation for OFDM-based multiuser multiple-access relay channels (MARCs) with network coding. We formulate a joint optimization problem considering source-node pairing, subcarrier assignment, subcarrier pairing, and power allocation to maximize the sum rate under per-user power constraints. The problem is solved in polynomial time by optimizing three separate subproblems. To further reduce the complexity, three low-complexity suboptimal algorithms are then proposed when fixing partial resource. The simulation results show the performance gains of the proposed algorithms versus per-node transmit power and source-node number, and the impact of relay location is also evaluated. © 1967-2012 IEEE.

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Han, B., Peng, M., Zhao, Z., & Wang, W. (2013). A multidimensional resource-allocation optimization algorithm for the network-coding-based multiple-access relay channels in OFDM systems. IEEE Transactions on Vehicular Technology, 62(8), 4069–4078. https://doi.org/10.1109/TVT.2013.2251025

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