基于OFDMA网络的最优分数频率复用方案的研究  

Optimal fractional frequency reuse in OFDMA-based cellular networks

作　　者：苗濛[1] 康骊[1] 渠慎丰[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《电子测量技术》2010年第4期123-127,共5页Electronic Measurement Technology

摘　　要：分数频率复用技术已经用在了干扰限制的网络系统中,从而提高蜂窝网络的覆盖能力,其代价是降低了可用网络资源的数量,进而降低了系统的频谱利用率。通过引入归一化的频谱利用率(normalized Spectral Efficiency,nSE)概念,以此作为最优频率复用问题的理论依据,实现最优分数频率复用的系统,从而不仅能像传统分数频率复用方案那样提高小区边缘用户的吞吐量,而且能提高系统的频谱利用率。仿真的结果表明该最优分数频率复用方案的小区边缘用户吞吐量提高了16%,而系统的频谱利用率提高3%。Fractional Frequency Reuse（FFR）is often used in interference-limited systems to improve coverage in cellular networks.Its cost is reducing the amount of available resources.In this paper,we intend to propose the optimal FFR scheme by introducing the concept of normalized SE.With the optimal Frequency Reuse Factor （FRF）,the optimal FFR scheme can maximize the system SE with throughput improvement of cell-edge users.To solve the optimal problem,we divide it into two sub-problems.However,this scheme is asymptotically optimal with the assumption of the uniform distributions of signal and interference in sectors.The simulation results demonstrate the gain of the system SE is about 3% by our optimal FFR scheme.Meanwhile,we propose a novel weighted scheduler,supporting different QoS requirement.

关 键 词：分数频率复用 最优理论 基于OFDMA蜂窝网络 

分 类 号：TN929.53[电子电信—通信与信息系统]