反馈延迟AMC系统中预测算法的设计与应用  

Design and Application of the Prediction Algorithm in AMC System with Feedback Delay

作　　者：王丹[1] 高奇[1] 孙鹏[1] 

机构地区：[1]重庆邮电大学移动通信技术重庆市重点实验室,重庆400065

出　　处：《自动化仪表》2015年第10期29-32,共4页Process Automation Instrumentation

基　　金：国家科技重大专项基金资助项目(编号:2011ZX03001-003-01)

摘　　要：由于现有LTE系统中的AMC方案没有考虑CQI反馈时延对系统性能的影响,导致AMC的效率随着CQI反馈时延的增加而降低。对此,采用基于时间序列的预测算法对CQI的值进行预测。考虑到预测算法对系统复杂度的影响,提出在不同的CQI反馈时延的情况下,自适应地使用不同复杂度的CQI预测算法。试验结果证明,该系统的误块率和现有的AMC系统相比有了明显的降低,证明了提出AMC方案的可行性与有效性。The efficiency of AMC is decreasing following the feedback time delay of CQI is increasing,it is because the influence of feedback time delay of CQI has not be taken into account for AMC scheme in existing LTE system. For this,the values of CQI are predicted by using the prediction algorithm based on time series. Considering the impact of prediction algorithm to the complexity of system,it is proposed that according to different CQI feedback time delay,different prediction algorithm shall be adaptively used. The experimental result show that the block error rate( BLER) of this AMC system is significantly lower than existing system; and the feasibility and effectiveness of the AMC scheme proposed is proved.

关 键 词：长期演进(LTE) 自适应调制编码(AMC) 信道质量指示(CQI) 时延 时间序列 

分 类 号：TN929.5[电子电信—通信与信息系统]