Joint Transceiver and Offset Design for Visible Light Communications With Input-Dependent Shot Noise
Abstract: In this paper, we investigate the problem of the joint transceiver and offset design for point-to-point point multiple-inputmultiple multiple-output output (MIMO) and multiple user multiple-input- single-output output visible light communication (VLC) systems. Both uplink and downlink nk multi-user multi user scenarios are considered. The shot noise induced by the incoming signals is considered, leading to a more realistic MIMO VLC channel model. Under key lighting constraints, we formulate non-convex non optimization problems aimed at minimizing the sum mean squared error. To optimize the transceiver and the offset jointly, a gradient projection projection-based procedure is resorted to. When only imperfect channel state information is available, a semidefinite programming programming-based based scheme is proposed to obtain robust st transceiver and offset. The proposed method is shown to non non-trivially outperform the conventional scaled zero forcing and singular. value decomposition-based based equalization methods. The robust scheme works particularly well when the signal is much stronger stronger than the noise.