Ad Hoc网络中基于信道状态的速率自适应机制  

A Rate Adaptation Mechanism Based on Channel State in Ad Hoc Network

作　　者：成德峰[1] 马刈非[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《应用科学学报》2008年第1期18-21,共4页Journal of Applied Sciences

基　　金：国家自然科学基金资助项目(No.60072016)

摘　　要：针对多跳Ad Hoc网络,给出了一种兼顾分组碰撞和信道误码的饱和吞吐量解析式,基于此提出一种速率自适应机制.该方案支持多个速率,能够根据信道状态,以最大化饱和吞吐量为目标,选择最优的数据分组长度和数据分组发送速率.仿真结果表明,该方案在饱和吞吐量和抗信道衰减方面性能优于OAR和不同速率模式下的802.11 DCF.在信道衰减较剧烈时,性能与802.11 DCF 1 Mbps相比提高260%,与OAR相比提高10%.An analytic formula of saturation throughput is presented for multi-hop Ad Hoe networks, which takes packet collision and channel conditions into account. Based on the formula, a rate adaptation mechanism is proposed. The scheme can adjust the rate of sending packets exactly, and choose the optimal size of packets to best match channel conditions for maximizing saturation throughput. Simulation results show that the scheme outperforms OAR and 802. 11 DCF with 10% and 260% improvement on the saturation throughput and channel-resiliency capability.

关 键 词：无线AD HOC网络 媒体接入控制协议 信道状态 速率自适应 

分 类 号：TN915.07[电子电信—通信与信息系统]