中文摘要：

为了减轻大规模MIMO多小区TDD系统中的导频污染,本文针对链状网大规模MIMO多小区TDD系统特点,提出了一种新的导频污染减轻方案。方案中将每个小区分成左区和右区,并将正交的导频序列分成三组。三组导频序列组依次、循环地分配给链状网中的各个左、右区域用户,从而实现目标用户与其相邻近区域用户安排正交导频序列,而目标用户与较远区域用户复用导频序列,从而减轻了导频污染。仿真结果表明,本文方案由于节省了上行信道估计时间,其吞吐量优于导频功率控制法。而且本文方案相对于导频列举法,计算量小,具有一定的实用价值。

英文摘要：

According to the characteristics of massive MIMO and multi-cell TDD system in the chain network, a new pilot contamination reduction scheme is proposed for eliminating the effect of pilot contamination. At first, every cell is divided into left area and fight area, and orthogonal pilot sequences are divided into three groups. Secondly, the three groups of pilot sequences are distributed to left or right area＇ s users in turn and circularly in the chain network. The target user and the adjacent area＇ s user are arranged orthogonal pilot sequences, and the target user and the remote area＇ s user are multi-plexed pilot sequences. So the pilot contamination is reduced. The numerical simulation results show that the throughput of the proposed scheme is superior to the pilot power control scheme because the uplink channel estimation time of the new scheme is reduced. The number of the proposed scheme＇ s calculation is small compared with the pilot exhaustive enumera- tion scheme. The r-rooosed scheme has a certain oractical value.