一种OSTBC-OFDM下行链路中的跨层自适应算法  

A Cross-layer Method for Multi-traffic QoS Guaranteed Transmission in OFDM-systems

作　　者：刘建[1] 朱光喜[1] 李黎[1] 郭磊[1] 王玲[1] 

机构地区：[1]华中科技大学电子与信息工程系

出　　处：《计算机科学》2008年第4期115-118,共4页Computer Science

基　　金：国家“863”计划(编号2003AA12331005);国家自然科学基金(编号60496315)

摘　　要：本文从跨层目标出发,分析了OSTBC-OFDM下行链路中支持多业务混合传输的特性与质量要求,提出一种兼顾媒体业务传输质量(QoS)保障及最大化传输效率的动态BER/PER目标调整算法。该算法根据无线传输系统的容量和信道质量,调整传输手段,并根据媒体业务包的质量要求,为发送缓冲区的各个业务包指定不同等级的BER/PER要求,并加载于各个子信道中,从而达到兼顾媒体业务传输质量和最大化传输效率的目的。A cross-layer method with dynimic BER/PER required is developed for multi-traffic transmission with QoS guaranteed on downlink OSTBC-OFDM system. The wireless physical channel quality and the time-delay requirements of traffics are considered conjointly. When the power is allocated to all sub-carriers according to the water-filling algorithm based on OSTBC-OFDM downlink CQI for maximizing the capacity of the channel, the resource and transmission method is chosen to the most emergent packets. Analysis and simulation show that the method improves the perform- ance of multi-traffic transmission for OSTBC-OFDM systems.

关 键 词：跨层自适应 动态BER调整 QOS保障 传输效率 

分 类 号：TN911.7[电子电信—通信与信息系统] TN929.533[电子电信—信息与通信工程]