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.
翻译:近年来,由于与互联网连接的装置数量庞大,对高速无线网络的需求大大增加,近年来对高速度无线网络的需求大大增加。在这方面,光学无线通信(OWC)在下一代无线网络中受到极大关注,OWC利用光带提供巨大的无证带宽带宽;OWC系统是方向性的,自然可以提供多投入和多产出(MIIMO)配置,为使用室内环境中大量发射器的多用户提供服务,以确保覆盖面;因此,必须有效管理多用户的干预,以提高OWC网络在考虑不同计量时的性能;因此,建议OWCS系统采用称为盲干扰校准(BAA)的传输计划,以最大限度地增加多x收益,而无需在MOM的假设中,很难实现多源信息传输机的传输(CSI)传输;然而,标准BIA(NC) 的顶层数据显示BIA(BAA) 的升级和BIA(B CRA) 的升级(BC) 等网络的升级区域,显示BIA的升级和BCIA的顶层数据。