LTE-Advanced系统下行参考信号设计技术

In this paper we introduce several considerations on downlink reference signals (DL-RS) design for LTE-Advanced systems. In order to satisfy the higher performance requirements of LTE-Advanced systems which need to be highly compatible with the LTE standards, the DL-RS need to be redesigned. In the first part of this paper we introduce some important features of the LTE-Advanced systems. In the second part we point out the reason for redesigning of the DL-RS. In part 3 we discuss compatibility problems for the new DL-RS. In part 4 and 5 we discuss several methods to design the new CSI-RS and DM-RS accordingly. In part 6 we summarize some problems need to be solved later.