多小区OFDMA系统中分数频率复用方法的优化分析

在以OFDMA为基本多址方式的第四代移动通信系统中,频率复用作为提高系统性能的有效方法受到了广泛的关注,特别是分数频率复用和软频率复用。然而,如何进一步优化基于这些频率复用方法的OFDMA系统还有待研究。本文分析了多小区OFDMA系统负载和频率集合分配比例对小区总吞吐量和小区边缘用户数据速率的影响。同时,给出了在保证小区边缘用户服务质量的条件下,使小区总吞吐量最优的小区中心频率分配比例,并用仿真进行验证。仿真结果还表明了,随着分配比例的增大,小区总吞吐量先增大后减小。

Optimal analysis for fractional frequency reuse in multi-cell OFDMA systems

Frequency reuse,such as fractional frequency reuse and soft frequency reuse,as an efficient scheme to improve system performance for the OFDMA-based 4th generation(4G) mobile communication,has been studied excessively.However,how to optimal the performance of OFDMA systems using these frequency reuse schemes need to be further studied.In this paper,the influence factors of cell total throughput and average data rates of cell-edge users,including traffic load and frequency set allocation,are analyzed in multi-cell OFDMA systems.We also explore frequency allocation ratio to optimize cell total throughput in condition of quality of service of cell-edge users being guaranteed.Simulation results show a trend of first increase and then decrease of cell-total throughput with the incensement of allocation ratio.