MIMO+OFDM系统中量化预编码的自适应反馈方法  

Adaptive feedback approach for quantized precoded MIMO-OFDM system

作　　者：姜静[1] 许家栋[1] 

机构地区：[1]西北工业大学电子信息学院,西安710065

出　　处：《计算机应用研究》2009年第7期2701-2703,共3页Application Research of Computers

基　　金：国家自然科学基金资助项目(60372031)

摘　　要：(西北工业大学电子信息学院,西安710065)摘要:首先介绍了MIMOOFDM系统中线性预编码的原理,并在此基础上提出了一种量化预编码的自适应反馈方法,即将移动终端反馈的移动速度和信道质量指示作为量化预编码确定反馈时间间隔和频域间隔的判决门限,可实现根据信道变化的快慢调整预编码矢量对应的资源块大小,使预编码矢量更符合实际的信道状态。通过仿真证明,该自适应反馈的量化预编码方法比非自适应的量化预编码方案更接近信道容量,可实现更稳定、更好的传输能力。Introduced in this contribution the principle of linear precoding, and put forward then a kind of adaptive feedback approach for quantized precoded MIMO-OFDM system. This approach is： the velocity and channel quality which user equip- ment feedback are threshold to set precoding time and frequency granularity, and make the size of precoding resource block is modified based on the speed of channel transformation, so precoding vectors are more consistent with real wireless channel. Through simulations, the adaptive feedback approach is more close to channel capacity than fix periodic feedback and can achieve more robust and better performance.

关 键 词：多输入多输出 OFDM 线性预编码 适应反馈 时频资源粒度 

分 类 号：TN929.533[电子电信—通信与信息系统]