Oblique projection: An interference mitigation for MIMO multihop full‐duplex relay,Transactions on Emerging Telecommunications Technologies

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Oblique projection: An interference mitigation for MIMO multihop full‐duplex relay
Transactions on Emerging Telecommunications Technologies ( IF 2.5 ) Pub Date : 2019-12-17 , DOI: 10.1002/ett.3799
Moubachir Madani Fadoul ₁ , MHD Nour Hindia ₂ , Kaharudin Dimyati ₂ , Effariza Hanafi ₂ , Iraj Sadegh Amiri _{3,

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Affiliation

Full‐duplex (FD) assisted multiple‐input–multiple‐output relaying increases the spectral efficiency through efficient spectrum utilization. The major concerns for the FD assisted relay system are the cancellation of inter‐relay interference (IRI) and relay self‐interference (RSI). Previous works were idealized only on the basis of either RSI or IRI; hence, all other realistic models to overcome the RSI or IRI were unappreciated. This paper aims to reduce the interference‐to‐signal ratio. We propose the joint relay's receive beamforming based on oblique projection to mitigate the RSI and IRI in multihop environments. Applying first orthogonal projectors to the relay's received signal, the relay's received signals are divided into interference subspace and signal subspace. Then, the desired signal is recovered from signal subspace by using oblique projection that cancels out the RSI and IRI. The geometric interpretation of oblique projection is analyzed to understand its properties. The major merit of this method is that it can be adopted even when the RSI and IRI channels are unknown. In comparison to the existing interference cancellation methods, the signal‐to‐interference ratio of our proposed method does not deteriorate even when the transmit power is high. Additionally, we demonstrate that the oblique projection output is equivalent to an orthogonal projection using geometrical interpretation, simulation, and theoretical derivation.

中文翻译：

斜投影：MIMO多跳全双工中继的干扰缓解

全双工（FD）辅助的多输入多输出中继可通过有效地利用频谱来提高频谱效率。FD辅助中继系统的主要关注点是消除中继间干扰（IRI）和中继自干扰（RSI）。以前的作品仅在RSI或IRI的基础上被理想化了；因此，所有其他克服RSI或IRI的现实模型均未得到赞赏。本文旨在降低干扰信号比。我们提出基于倾斜投影的联合中继的接收波束成形，以减轻多跳环境中的RSI和IRI。将第一正交投影仪应用于中继站的接收信号，中继站的接收信号分为干扰子空间和信号子空间。然后，通过使用抵消RSI和IRI的倾斜投影，可以从信号子空间中恢复所需的信号。分析斜投影的几何解释以了解其特性。该方法的主要优点是，即使RSI和IRI通道未知，也可以采用该方法。与现有的干扰消除方法相比，即使发射功率很高，我们提出的方法的信噪比也不会降低。此外，我们使用几何解释，模拟和理论推导证明了斜投影输出等效于正交投影。该方法的主要优点是，即使RSI和IRI通道未知，也可以采用该方法。与现有的干扰消除方法相比，即使发射功率很高，我们提出的方法的信噪比也不会降低。此外，我们使用几何解释，模拟和理论推导证明了斜投影输出等效于正交投影。该方法的主要优点是，即使RSI和IRI通道未知，也可以采用该方法。与现有的干扰消除方法相比，即使发射功率很高，我们提出的方法的信噪比也不会降低。此外，我们使用几何解释，模拟和理论推导证明了斜投影输出等效于正交投影。

更新日期：2019-12-17

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