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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.
Traditional adaptive modulation and coding (AMC) is based on the channel state adaptively select the rate of transmission.To better improve the network performance, a joint consideration of the physical layer channel status and link layer buffer queue length The improved AMC enables the system to select the most suitable rate for transmission according to the real-time channel status and the length of the buffer queue.Compared with the traditional AMC method, the improved AMC method can better improve the network performance. 3-node multi-hop network model, under the joint allocation of power and bandwidth algorithm can get the maximum throughput to meet the delay requirements.The simulation results show that the new method can meet the system delay requirements under the premise of improving the network Throughput.