In this paper, we investigate an integrated visible light positioning and communication (VLPC) system with a single LED-lamp. First, by leveraging the fact that the VLC channel model is a function of the receiver's location, we propose a system model that estimates the channel state information (CSI) based on the positioning information without transmitting pilot sequences. Second, we derive the Cramer-Rao lower bound (CRLB) on the positioning error variance and a lower bound on the achievable rate with on-off keying modulation. Third, based on the derived performance metrics, we optimize the power allocation to minimize the CRLB, while satisfying the rate outage probability constraint. To tackle this non-convex optimization problem, we apply the worst-case distribution of the Conditional Value-at-Risk (CVaR) and the block coordinate descent (BCD) methods to obtain the feasible solutions. Finally, the effects of critical system parameters, such as outage probability, rate threshold, total power threshold, are revealed by numerical results.
翻译:在本文中,我们用单一LED光标来调查一个综合可见光定位和通信系统(VLPC)。首先,通过利用VLC频道模型是接收器位置的函数,我们提出了一个系统模型,根据定位信息而不是传送试点序列来估计频道状态信息(CSI),第二,我们从定位差差差差和对可实现的离线调制率的下限(CRLB)中得出Cramer-Rao下限(CRLB)。第三,根据衍生的性能指标,我们优化电力分配,以尽量减少CRLB,同时满足电速过速概率限制。为了解决这一非电离层优化问题,我们采用了最坏的配置条件值-在里斯克(CVaR)和区坐标协调下限方法,以获得可行的解决方案。最后,关键系统参数(如超值概率、速阈值、总功率阈值阈值)的效果通过数字结果来揭示。