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arXiv 2109.12433cs.ITcs.NIeess.SPmath.IT
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6G光无线通信中的盲干扰对准

Blind Interference Alignment in 6G Optical Wireless Communications

Ahmad Adnan Qidan, Taisir El-Gorashi, Jaafar M. H. Elmirghani

摘要:

近年来,由于连接到互联网的设备数量巨大,对高速无线网络的需求已经显著增加。在此背景下,光无线通信(OWC)在下一代无线网络的背景下已经受到极大的关注,其中OWC使用光学频带提供巨大的未授权带宽。OWC系统是定向的,并且可以自然地提供多输入和多输出(MIMO)配置,其在室内环境中使用大量发射器来服务多个用户以确保覆盖。因此,必须有效地管理多用户干扰,以提高OWC网络的性能,考虑不同的度量。针对OWC系统提出了一种称为盲干扰对齐(BIA)的传输方案,可以在不需要发射机处的信道状态信息(CSI)的情况下最大化复用增益,而这在MIMO场景中很难实现。然而,标准BIA避免了对CSI的需要,代价是需要足够大的信道相干时间来发送整个传输块。此外,BIA的方法导致随着发射机和用户数量的增加而增加的噪声。因此,各种网络拓扑,如网络中心(NC)和用户中心(UC)的设计被提出来放松BIA的限制,其中这些拓扑将接收区域划分为多个集群。结果表明,与标准BIA相比,拓扑BIA的性能显着增强。

英文摘要:

In recent years, the demand for high speed wireless networking has increased considerably due to the enormous number of devices connected to the Internet. In this context, optical wireless communication (OWC) has received tremendous interest in the context of next generation wireless networks where OWC offers a huge unlicensed bandwidth using optical bands. OWC systems are directional and can naturally provide multiple-input and multiple-output (MIMO) configurations serving multiple users using a high number of transmitters in the indoor environment to ensure coverage. Therefore, multiuser interference must be managed efficiently to enhance the performance of OWC networks considering different metrics. A transmission scheme referred to as blind interference alignment (BIA) is proposed for OWC systems to maximize the multiplexing gain without the need for channel state information (CSI) at the transmitters, which is difficult to achieve in MIMO scenarios. However, standard BIA avoids the need for CSI at the cost of requiring channel coherence time large enough for transmitting the whole transmission block. Moreover, the methodology of BIA results in increased noise with increase in the number of transmitters and users. Therefore, various network topologies such as network centric (NC) and user centric (UC) designs are proposed to relax the limitations of BIA where these topologies divide the receiving area into multiple clusters. The results show a significant enhancement in the performance of topological BIA compared with standard BIA.

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