无线Mesh网络中AMC的改进

传统的自适应调制编码（AMC）是单纯根据信道状态自适应的选择速率进行传输。为更好的提高网络性能，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，使系统能够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。相比较传统的AMC方法，提出的改进AMC方法能更好的提高网络性能。通过对三节点的多跳网络进行建模，在功率与带宽联合分配算法下，得到满足时延要求的最大吞吐量。仿真结果表明提出的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 Improved AMC in Wireless Mesh Network

The traditional adaptive modulation and coding (AMC) choose transmission rate adaptively only according to channel state. In order to achieve better performance of the network, an improved AMC considered both the channel state of the physical layer and the buffer queue length of the data link layer is developed in this paper, which 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, the improved AMC can achieve a better network performance. Based on the three-node multiple hops network model, it gets the largest throughput which satisfy the delay requirement through the joint distribution algorithm of power and bandwidth. Simulation results show that the new method can improve the throughput performance of the network which meets the system delay requirements.