室内VLC-MIMO通信系统信道建模与光源布局优化设计OA

To address the issues of edge optical power attenuation,multiple-input multiple-output(MIMO)channel orthogonality degradation,and the cliff effect associated with conventional single-source configurations in indoor visible light communication(VLC)systems,this paper proposes a channel modeling and light source layout optimization scheme for indoor VLC-MIMO communication systems.Based on the Lambertian radiation model,the channel direct current gain matrix is established,and a distributed 4×4 LED array topology is designed with the objectives of achieving uniform illumination and ensuring communication reliability.Furthermore,the performance of two receiver architectures,namely zero-forcing detection and equal gain combining(EGC)diversity,is comparatively investigated.Simulation and experimental results demonstrate that the proposed distributed LED array effectively improves indoor illumination distribution while satisfying lighting standard requirements.The channel matrix in the central region exhibits a low condition number and near-orthogonal characteristics,whereas increased channel correlation and a significantly larger condition number are observed in edge regions.Under such conditions,the EGC diversity architecture effectively mitigates the noise enhancement caused by channel correlation.In particular,in the edge coverage area,the proposed scheme not only satisfies the reliable communication requirement with a bit error rate(BER)below 10-3,but also maintains the BER below 10-4,thereby achieving superior communication performance.These results indicate that the proposed method is capable of effectively enhancing communication reliability and coverage performance,providing a valuable reference for optimizing light source layouts and evaluating performance in indoor VLC systems.