Performance Analysis of Chunk-Based Resource Allocation in Multi-Cell OFDMA Systems
Performance Analysis of Chunk-Based Resource Allocation in Multi-Cell OFDMA Systems
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DOI：
10.1109/jsac.2014.141216
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发表时间：
2014-02
影响因子：
16.4
通讯作者：
Huiling Zhu;Jiangzhou Wang
中科院分区：
文献类型：
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作者：
Huiling Zhu;Jiangzhou Wang
在正交频分多址（OFDMA）系统中，在多个用户之间分配无线资源的高效且低复杂度的方法之一是基于块的资源分配，其将多个相邻子载波分组为一个块并逐块地分配资源。本文研究了多小区 OFDMA 环境中基于块的资源分配的性能分析。蜂窝 OFDMA 中考虑了部分频率复用 (FFR)。基本上，FFR 将每个小区划分为中心区域和边缘区域，其中假定频率复用因子的两个不同值。本文分析评估了系统参数对频谱效率性能的影响，包括中心区域与整个小区的半径比、发射信噪比（SNR）、用户数量、每个块的子载波数量和相干带宽。数值结果表明，在所提出的研究中存在实现最高频谱效率的最佳半径比。最佳半径比约为 0.7，这几乎与 SNR、用户数量和每个块的子载波数量无关。换句话说，在达到最佳性能的情况下，整个小区的中心区域和边缘区域的尺寸几乎相等。
In the orthogonal frequency division multiple access (OFDMA) system, one of the efficient and low complex methods to allocate radio resources among multiple users is chunk-based resource allocation, which groups a number of adjacent subcarriers into a chunk and allocates resources chunk by chunk. In this paper, performance analysis of chunk-based resource allocation is studied in the multi-cell OFDMA environment. Fractional frequency reuse (FFR) is considered in the cellular OFDMA. Basically, FFR divides each cell into central and edge areas where two different values of the frequency reuse factor are assumed. This paper analytically evaluates how spectral efficiency performance is affected by system parameters, including radius ratio of the central area to the whole cell, transmit signal to noise ratio (SNR), number of users, number of subcarriers per chunk, and coherence bandwidth. The numerical results show that there exists an optimal radius ratio to achieve the highest spectral efficiency in the proposed research. The optimal radius ratio is about 0.7, which is almost irrespective of the SNR, number of users, and number of subcarriers per chunk. In other words, the sizes of the central area and the edge area of the whole cell are almost equal when achieving the optimal performance.