Matched-Filter Detector with Quadrature Interference Cancellation for Coded Uplink Multiuser MIMO Systems with Massive IoT Devices
Matched-Filter Detector with Quadrature Interference Cancellation for Coded Uplink Multiuser MIMO Systems with Massive IoT Devices
复制标题
用于具有大规模 IoT 设备的编码上行链路多用户 MIMO 系统的具有正交干扰消除功能的匹配滤波器检测器
DOI：
10.1109/twc.2021.3126373
复制
发表时间：
2021
影响因子：
10.4
通讯作者：
Ochiai Hideki
中科院分区：
文献类型：
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作者：
Hama Yuto;Ochiai Hideki
我们提出了一种新的干扰消除（IC）方法，该方法专为支持大量物联网（IoT）设备的编码上行链路多输入多输出（MIMO）系统而设计。MIMO空间复用的性能取决于符号检测方案，其通常在错误率性能和计算复杂度之间提供折衷。先前的研究表明，即使没有IC，随着基站（BS）天线数量的增加，具有强大信道编码的简单基于匹配滤波器（MF）的检测器也可以实现接近最佳的性能。然而，如果BS天线的数量与BS支持的IoT设备的数量相同，则其可实现速率将显著降低。此外，由于缺乏正交导频序列而导致的信道估计误差也应该成为主导因素。本文通过引入一种具有正交干扰消除的中频检测器（MF-QIC）来克服这个问题，它可以改善错误性能和频谱效率。以极化码为例，提出了一种基于互信息的MF-QIC码设计方法。我们的仿真结果表明，所提出的低复杂度极化编码MF-QIC优于其他传统的方法，即使在存在不完美的信道状态信息。
We propose a new interference cancellation (IC) approach designed for coded uplink multiple-input multiple-output (MIMO) systems that support a massive number of Internet-of-Things (IoT) devices. The performance of MIMO spatial multiplexing depends on the symbol detection schemes, which in general offer a trade-off between the error rate performance and computational complexity. Previous studies have shown that a simple matched-filter (MF)-based detector with powerful channel coding can achieve near-optimal performance as the number of base station (BS) antennas increases even without IC. However, if the number of BS antennas is the same order as that of the IoT devices supported by the BS, its achievable rate will be significantly degraded. Furthermore, channel estimation errors due to the lack of orthogonal pilot sequences should also become a dominant factor. This paper overcomes this problem by introducing a MF detector with quadrature interference cancellation (MF-QIC), which can improve error performance and spectral efficiency. Taking polar codes as our channel coding example, we propose a code design based on mutual information tailored for MF-QIC. Our simulation results demonstrate that the proposed low-complexity polar-coded MF-QIC outperforms other conventional approaches even in the presence of imperfect channel state information.