區塊對角化預編碼方法在LTE多點傳輸之模擬研究

Abstract

本篇論文探討預編碼方法應用於LTE規格當中的表現。我們特別探討預編碼方法當中的區塊對角預編碼方法(block diagonalization)以及多用戶特徵傳輸預編碼方法(multi-user eigenmode transmission)，其中兩者皆為基於通道資訊的奇異質分解(singular value decomposition)方法來獲得預編碼矩陣，並透過該矩陣消除來自其他通道的干擾。在LTE系統當中訂出了用來做預編碼的碼書(codebook)，並且在其中一模式下手機會回報預編碼索引，透過預編碼索引(precoding matrix indicator)來選擇預編碼矩陣。我們將觀察在無法獲得原通道資訊的情況下，透過預編碼索引來做對角預編碼方法以及多用戶特徵傳輸預編碼方法會有何變化。在模擬方法中，我們排除使用功率優化(power optimization)帶來的影響。另外，我們也加入多點協調(coordination multi-point, CoMP)的架構下的預編碼方法表現來做探討。

This thesis discuss the performance of precoding method for LTE specification. We emphasis on the block diagonalization (BD) and multi-user eigenmode transmission (MET) in which the precoding matrix are computed by the singular value decomposition (SVD) to eliminate the interference from the other channels. The codebook for precoding in introduced in the LTE system. The precoding is computed with the precoding matrix index (PMI) which is transmitted from the user according to the channel information in the one of the transmission modes. In the thesis we observe the performance in the BD and MET with PMI feedback. In our simulation, we excluded the effect of power optimization. Besides we discuss them with the Coordination Multi-Point (CoMP).