一种基于OFDMA系统的频率复用方法
doi: 10.3724/SP.J.1146.2007.01663
A Frequency Reuse Scheme for OFDMA Systems
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摘要: 频率复用作为提高小区边缘用户性能的有效方式已被广为研究。然而，如何在提高小区边缘用户性能的同时，使频谱利用率得到有效提高仍是一个有待解决的问题。在以正交频分多址(OFDMA)为基本多址方式的第4代(4G)系统中该问题尤为突出。为此，该文提出了一种OFDMA系统中的频率复用方法，通过抑制小区间干扰提高小区边缘用户性能；同时，根据小区中心与小区边缘通信环境的差异，分别对其实施不同的频率复用策略使频率复用系数接近于1以提高频谱利用率。仿真结果表明，与未经过频率规划的全频率复用相比，该文提出的频率复用方法提高了系统吞吐量并显著改善了小区边缘用户性能。Abstract: Frequency reuse, as an efficient strategy to improve Cell-Edge User (CEU) performance, has already been well studied. However, improving spectral efficiency, as well as enhancing performance for CEU, is still left for an open research issue, especially for Orthogonal Frequency Division Multiple Access (OFDMA)-based 4th generation (4G) systems. Hence, a frequency reuse scheme which improves CEU performance by inter-cell interference mitigation is proposed for OFDMA systems here. In the meantime, to achieve a frequency reuse factor near 1, different frequency reuse strategies are assigned to cell-edge and cell-center due to the discrepancy between them. Simulation results demonstrate that, compared with full frequency reuse without frequency planning, the proposed frequency reuse scheme improves system throughput and CEU throughput significantly.
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