摘要
传统的自适应调制编码(AMC)是单纯根据信道状态自适应地选择速率进行传输的.为更好地提高网络性能,提出了一种联合考虑物理层的信道状态和链路层缓冲区队列长度的改进AMC,使系统能根据实时的信道状态和缓冲区队列长度的大小,选择最合适的速率进行传输.与传统的AMC方法相比,改进的AMC方法能更好地提高网络性能.通过对3节点的多跳网络进行建模,在功率与带宽联合分配算法下,可以得到满足时延要求的最大吞吐量.仿真结果表明,该新方法可以在满足系统时延要求的前提下,提高网络吞吐量.
The traditional adaptive modulation and coding （AMC） have to choose transmission rate adaptively only according to channel state. In order to achieve better performance of the network, an improved AMC considering both the channel state of the physical layer and the buffer queue length of the data link layer is proposed, that can choose the transmission rate self-adaptively according to the buffer queue length of the link layer and the channel state. Compared to the traditional AMC method, this improved AMC can achieve better network performance. By means of the three-node multiple hops network model, the largest throughput satisfying the delay requirement through the joint distribution algorithm of power and bandwidth, is also obtained. Simulation results show that the new method can improve the throughput performance of the network which meets the system delay requirements.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2011年第6期73-77,共5页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(61172073)
中央高校基本科研业务费专项项目(2011JBM210)
东南大学移动通信国家重点实验室开放课题(W200906)
