自适应ARQ系统中基于跨层设计的优化方法  

Cross-layer optimization method in ARQ systems with adaptive modulation

作　　者：李玉萍[1] 余官定[1] 赵志峰[1] 张朝阳[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2007年第12期1962-1966,1981,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(60572115);国家科技支撑计划资助项目(2006BAH02A13-4);浙江省自然科学基金重点资助项目(Z104252)

摘　　要：针对IEEE 802.16e系统中的混合自动重传请求(HARQ)协议,将数据链路层的子包传输机制与物理层的自适应调制编码技术(AMC)有效地结合,提出一种基于跨层设计的自适应参数优化选择方法,该方法以最大化系统吞吐量为目的,研究了HARQ子包数目和调制编码方式的联合最优解.同时,还给出了考虑链路层HARQ协议的AMC切换门限准则.仿真结果表明,该参数优化方案能够更好地匹配信道的时变特性,在增加少量复杂度为代价的前提下,实现了系统吞吐量的进一步提高.Based on the adaptive hybrid automatic repeat request （HARQ） protocol in IEEE 802.16e systems, a cross-layer optimization method was proposed, which efficiently combined the sub-packet transmission scheme at data link layer and the adaptive modulation and coding （AMC） at physical layer. Following the cross-layer design method, the number of sub-packets and the scheme of modulation and coding were jointly optimized to maximize the system throughput. A novel criterion on the SNR threshold of AMC was also given with taking the HARQ protocol into consideration. Simulation showed that the optimization method can efficiently adapt to the time-varying channel and improve the system throughput dramatically at a very tiny cost of implementation complexity.

关 键 词：自适应调制编码 混合自动重传请求 自适应子包 跨层设计 

分 类 号：TP929.53[自动化与计算机技术]