Low-Complexity Blind Interference Suppression With Reconfigurable Antennas
Low-Complexity Blind Interference Suppression With Reconfigurable Antennas
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DOI：
10.1109/twc.2021.3115696
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发表时间：
2022-04
影响因子：
10.4
通讯作者：
M. Johnny;Alireza Vahid
中科院分区：
文献类型：
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作者：
M. Johnny;Alireza Vahid
我们提出了一种新的低复杂性干扰管理算法，该算法利用可重新配置的天线，消除了$ k $ - 用户干扰渠道中的大部分干扰信号功率，并实现了有望但未实现的低到中等信号 - 中等信号的干扰收益。拨号比（SNR）范围。可重新配置的天线包括几个元素，每个元素都使用射频（RF）开关单独控制。天线仅具有一个RF链，从而实现了简单的硬件设计并启用了低复杂性算法。我们利用时空多样性，以找到激活或停用天线元件的两个单独的组合，以允许干扰中和/消除。找到这样的状态是我们开发新颖，有效算法的一项繁琐的任务。我们进一步设计了简单的编码和解码，并以缩短的预言器长度来利用我们的设计的好处。我们的实施不依赖于发射机的渠道状态信息；与典型的自由度结果不同，以有限的信号噪声比率进行工作。并在速度慢的环境中工作。我们计算平均可实现的速率，达到特定干扰抑制水平的最小元素数量，并提供对技术的中断分析。
We present a new low-complexity interference management algorithm that exploits reconfigurable antennas, removes most of the interference signal power in a $K$ -user interference channel, and achieves the promised but unrealized gain of interference alignment in low-to-medium signal-to-noise ratio (SNR) range. The reconfigurable antenna includes several elements, each controlled individually using a radio frequency (RF) switch. The antenna has only one RF chain, resulting in simple hardware design and enabling low-complexity algorithms. We exploit space-time diversity to find two separate combinations of activating or deactivating antenna elements to allow for interference neutralization/elimination. Finding such states is a cumbersome task for which we develop novel, efficient algorithms. We further devise simple encoding and decoding with short precoder length to exploit the benefits of our designs. Our implementation does not rely on channel state information at the transmitters; works at finite signal-to-noise ratios, unlike the typical degrees-of-freedom results; and works in slow-fading environments. We calculate the average achievable rates, the minimum number of elements to reach a specific level of interference suppression, and we provide outage analysis of our technique.