Abstract

This paper considers a multiuser (MU) multiple‐input multiple‐output (MIMO) visible light communication (VLC) system with broadcast channels. Due to the simultaneous transmission of the different source data to the receivers covered with the light rays, the interuser interference (IUI) may degrade the system performance. We strive to suppress the IUI by minimizing the maximum mean square errors (MSE) under the assumption of the perfect knowledge of channel state information (CSI). However, since the CSI may not be perfectly known in practice, a robust design is required against the channel uncertainties. Additionally, the nonnegativity and the limited linear range of the optical signals have been taken into account in the VLC transceiver designs. Simulation results validate that the proposed min‐max‐MSE approach can provide fair transmission, compared with the minimization of sum‐MSE approach. Furthermore, it is demonstrated that the robust scheme is capable of providing robustness and gaining a considerable bit error rate (BER) performance.

Highlights

  • With the rapid development of the light-emitting diode (LED), a novel communication technology known as visible light communication (VLC) gives rise to researchers’ interests

  • Multiple lighting sources are often utilized for the whole room illumination and a higher transmission rate can be achieved through spatial multiplexing by constructing the multiple-input multiple-output (MIMO) VLC system [4,5,6]

  • It is obvious that the sum-mean square errors (MSE) performance with perfect channel state information (CSI) is better than the one with imperfect CSI under the same power constraint

Read more

Summary

Introduction

With the rapid development of the light-emitting diode (LED), a novel communication technology known as VLC gives rise to researchers’ interests. Visible light cannot penetrate walls because of its high frequency; as a result, indoor communications will not suffer from the intercell interference and security can be provided [3]. Multiple lighting sources are often utilized for the whole room illumination and a higher transmission rate can be achieved through spatial multiplexing by constructing the MIMO VLC system [4,5,6]. Due to users receiving all light rays from multiple lighting sources, the IUI may exist, which degrades the system performance. The IUI cancellation methods have been extensively investigated in MU radio frequency (RF) systems. They cannot be applied directly to VLC systems because of the following reasons. The CSI may not always be perfectly known and the channel uncertainties could lead to severe performance degradation when the transceiver design is only based on the estimated

H ChKannel
System Model
Optimal Transceiver Design with Perfect Channel State Information
Robust Transceiver Design with Imperfect Channel State Information
Simulation Results
Conclusion
Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call