A Multidimensional Resource-Allocation Optimization Algorithm for the Network-Coding-Based Multiple-Access Relay Channels in OFDM Systems

作者：Han Bin^*; Peng Mugen; Zhao Zhongyuan; Wang Wenbo

来源：IEEE Transactions on Vehicular Technology, 2013, 62(8): 4069-4078.

DOI：10.1109/TVT.2013.2251025

• Multiple-access relay channels (MARC)
• network coding
• orthogonal frequency-division multiplexing (OFDM)
• resource allocation

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.

• 出版日期2013-10
• 单位北京大学