Abstract: In this paper, the limited feedback techniques based on the codebook for Multiple-Input Multiple-Output (MIMO) system in the Long Term Evolution-Advanced (LTE-Advanced) applications were investigated. A new limited feedback technique based on multi-level linear prediction was proposed. This method utilized the time correlation of the channel to predict the value of the channel based on multi-level linear prediction. By minimizing the mean square error to design a quantization code book in the basis of the prediction error, code number in the code book was used for system feedback. The simulation results show that multi-level linear prediction can effectively reduce the system prediction error, equivalently, reducing feedback overhead of the system and the maximum reduction rate of 15% to the amount of system feedback that can be reached.

Key words: Multiple-Input Multiple-Output (MIMO), limited feedback, amount of feedback, multi-level linear prediction, vector quantization

摘要： 以先进的长期演进技术(LTE-Advanced)为背景，针对多输入多输出（MIMO）系统中基于码本的有限反馈技术进行了研究，提出了一种基于多级线性预测的有限反馈新方法。利用信道的时间相关性，对信道值进行多级线性预测，以预测误差为基础，通过最小化均方误差来设计量化码本，将码本中对应的码字序号用于系统反馈。仿真结果表明：采用多级线性预测能有效地降低系统预测误差，等效地，减小了系统的反馈开销，最大降低幅度能达到15%。

关键词: 多输入多输出, 有限反馈, 反馈量, 多级线性预测, 矢量量化