Light-fidelity (LiFi) is an emerging technology for high-speed short-range mobile communications. Inter-cell interference (ICI) is an important issue that limits the system performance in an optical attocell network. Angle diversity receivers (ADRs) have been proposed to mitigate ICI. In this paper, the structure of pyramid receivers (PRs) and truncated pyramid receivers (TPRs) are studied. The coverage problems of PRs and TPRs are defined and investigated, and the lower bound of field of view (FOV) for each PD is given analytically. The impact of random device orientation and diffuse link signal propagation are taken into consideration. The performances of PRs and TPRs are compared and then optimized ADR structures are proposed. The performance comparison between the select best combining (SBC) and maximum ratio combining (MRC) is given under different noise levels. It is shown that SBC will outperform MRC in an interference limited system, otherwise, MRC is a preferred scheme. In addition, the double source system, where each LiFi AP consists of two sources transmitting the same information signals but with opposite polarity, is proved to outperform the single source (SS) system under certain conditions.
翻译:光纤(LiFi)是高速短程移动通信的新兴技术,跨细胞干扰(ICI)是一个重要问题,它限制了光学原子细胞网络的系统性能。提出了减少光学原子细胞网络的系统性能。建议了光多样性接收器(ADRs),以缓解 ICI 。在本文件中,研究了金字塔接收器(PRs)和短线金字塔接收器(TPRs)的结构;界定和调查了PRs和TPRs的覆盖范围问题,对每个PD的视野范围较低(FOV)进行了分析。考虑到随机设备方向和扩散链接信号传播的影响。对PRs和TPRs的性能进行了比较,然后优化了ADR结构。对选定的最佳组合(SBC)和最高组合率(MRC)的性能比较在不同噪音水平下进行。显示SBC在受干扰有限的系统中将超越MRC,否则,MRC是一种首选办法。此外,双源系统,每个LIFI AP系统由两种来源组成,在相同的单一源下传送。