| 链状网大规模MIMO系统中导频污染减轻方案 |
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| 引用本文： | 张翠芳. 曾桂根. 链状网大规模MIMO系统中导频污染减轻方案[J]. 信号处理, 2016, 32(10): 1202-1212. DOI: 10.16798/j.issn.1003-0530.2016.10.09 |
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| 作者姓名： | 张翠芳. 曾桂根 |
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| 作者单位： | 南京邮电大学通信与信息工程学院 |
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| 基金项目： | 国家自然科学基金资助项目（61471202，61501248） |
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| 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。
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| 关 键 词： | 链状网 大规模多输入多输出 时分双工系统 导频污染 |
| 收稿时间： | 2016-02-19 |
Pilot Contamination Reduction Scheme in massive MIMO systems based on chain network |
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| Affiliation: | College of Communication and Information Engineering, Nanjing University of Posts and Telecommunications |
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| Abstract: | According to the characteristics of massive MIMO and multi-cell TDD system in the chain network, a new pilot contamination reduction scheme is proposed. At first, every cell is divided into left area and right 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 multiplexed 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 enumeration scheme. The proposed scheme has a certain practical value. |
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