机构地区: 东莞理工学院
出 处: 《南昌大学学报(理科版)》 2007年第5期500-503,共4页
摘 要: 正交频分复用OFDM(Orthogonal Frequency Division Multiplexing)系统以其优良的对抗频率选择性衰落和信号码间串扰的能力,被看作是Beyond 3G移动通信的主要技术。IEEE802.16工作组将OFDM和OFDMA(Or-thogonal Frequency Division Multiple Accessing)作为802.16d/e的物理层选择。802.16e重点采用OFDMA来保证移动性,它的物理层可以支持四种不同的子载波数量,信号带宽与子载波数量成正比,这就可以在移动环境中灵活适应信道带宽的变化。本文对单蜂窝系统中下行链路的资源分配(包括子载波的分配和功率的分配)进行了研究探讨,提出了一个投机算法,目的是最大化系统的瞬时数据吞吐量。 Since it could impact frequency selective fading and inter -code interference, OFDM is considered as a principal technique for Beyond 3G. IEEE802.16 work group chose OFDM and OFDMA for supporting 802.16d/e. 802.16e adopted OFMDA to guarantee user' s mobility. Its physical layer supports four different subcarrier numbers, the assigned bandwidth is based on the subcarrier' s number, it thus allows to adapter the various channels bandwidth. This paper proposed an opportunistic algorithm, which discusses resource allocation ( including subcarriers allocation and power allocation) on downlink in a single cell of WiMAX system. Its objective is to maximize the instantaneous throughput in system.
关 键 词: 全球微波接入互操作性 正交频分多址接入 资源分配 投机算法 注水法