Modified HTRCI with Variable Pulse Generation for Pilot De-contamination

Modified HTRCI with Variable Pulse Generation for Pilot De-contamination
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DOI：
10.1109/atc.2019.8924500
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发表时间：
2019-10
期刊：
2019 International Conference on Advanced Technologies for Communications (ATC)
影响因子：
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通讯作者：
Shun Kuroki;Kakeru Matsubara;K. Maruta;C. Ahn
Shun Kuroki;Kakeru Matsubara;K. Maruta;C. Ahn
中科院分区：
其他
文献类型：
--
作者：
Shun Kuroki;Kakeru Matsubara;K. Maruta;C. Ahn

文献摘要

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大规模多输入多输出（MIMO）系统是下一代无线通信系统的关键技术之一，其中基站（BS）配备有数百个天线。导频污染是影响大规模MIMO系统性能的主要因素之一。本文旨在消除这种试点污染的影响。高时间分辨率载波干涉测量（HTRCI）是以前提出的，它可以执行高精度的信道估计，减少导频信号的数量。原始HTRCI以1/4等间隔产生脉冲。对于当前的OFDM系统设计，更精细和可变的脉冲分配是可用的，例如，高级长期演进（LTE-A）的保护间隔（GI）长度是OFDM符号持续时间的1/8或1/16。本文提出了一种改进的HTRCI算法，该算法采用1/8间隔可变脉冲产生，可以估计每个接收天线4个接入点的信道状态信息（CSI）。本文扩展了HTRCI的概念，以估计更多的通道，这些CSI可以以相同的方式通过时域信号处理分离。该方法适用于下行多小区MIMO传输中的导频去污染。计算机仿真结果表明，与传统方法相比，该方法可以改善误码率性能。
Massive Multiple-Input-Multiple-Output (MIMO) systems, where the base station (BS) is equipped with hundred antennas, is expected to be one of the key technologies for the next generation wireless systems. Pilot contamination is one of performance degradation factors for massive MIMO. This paper aims to eliminate this pilot contamination impact. High time resolution carrier interferometry (HTRCI) was previously proposed which can perform highly accurate channel estimation with reducing the number of pilot signals. The original HTRCI generated the impulses in 1/4 equal interval. With regarding the current OFDM system design, more fine and variable impulse allocation is available, e.g. the guard interval (GI) length of Long-Term-Evolution-Advanced (LTE-A) is 1/8 or 1/16 of the OFDM symbol duration. This paper proposes the modified HTRCI with variable pulse generation at 1/8 interval which can estimate channel state information (CSI) of the 4 access per received antenna. This paper expands the concept of HTRCI to estimate more channels and these CSIs can be separated by time-domain signal processing in the same manner. It is applied to the pilot de-contamination on downlink multi-cell MIMO transmission. Computer simulation results confirm that the BER performance can be improved as compared with the conventional method.