WPAN/WLAN应用环境下基于PER的链路自适应算法  

Algorithm based on packet error ratio of link adaptation

作　　者：钱小勇[1] 沈连丰[1] 胡静[1] 许国军[1] 陈锦泰[2] 

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096 [2]香港中文大学电子工程学系

出　　处：《通信学报》2003年第4期94-103,共10页Journal on Communications

基　　金：国家自然科学基金资助项目(60072016);教育部重点科学技术资助项目(99176);香港特区政府UGC/AoEIT(university grant council/area of excellence in information technology)资助项目

摘　　要：本文重点研究基于包错误率测量的链路自适应算法,分析了包错误率与信道参数的关系,提出了一种有别于固定门限值方案的优化门限值方案。仿真结果表明,优化门限值方案的网络吞吐量要大于固定门限值方案和基于信干比估计的链路自适应算法,最大增幅可达12Mbit/s。在系统引入重传机制后,网络吞吐量将有所损失,但最大不超过1Mbit/s,相比较服务质量的提高是值得的。需指出的是,虽然分析和仿真均以HIPERLAN/2为例,但不失一般性,它们同样适合于WPAN/WLAN等类似系统。In the link adaptation algorithm based on PER, an optimum threshold scheme was presented instead of an existing fixed threshold scheme. We analyzed the relationship between PER and channel parameters and obtained PER thresholds through simulations. In the environment requiring guaranteeing QoS, the PER thresholds were revised when retransmission was taken into accounts. Simulation results indicate that the optimum threshold scheme is better than other algorithms in term of throughput. In addition, it is valuable for the improvement of QoS at the cost of a little throughput loss when ARQ scheme was adopted. It should be noted that the algorithms could be extended into other WPAN/WLAN applications although they were studied in HIPERLAN/2.

关 键 词：WPAN WLAN 链路自适应 无线个域网 无线局域网 包错误率 PER 

分 类 号：TN925.93[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]