Abstract
Recently, visible light communication (VLC) has attracted increasing research interests, thanks to its notable advantages including for example abundant spectra, simultaneous illumination and communication, radiation-free deployment, etc. Benefitting from the widely availability of light emitting diode (LED), the VLC systems employing LED arrays are ready to exploit the multiple-input multiple-output (MIMO) technologies, where a high degree-of-freedom in, for example, the precoding design can be utilized for system performance enhancement. In this paper, we propose a new precoding scheme for multiuser (MU) MIMO-VLC systems, where the classical block diagonalization precoding (BDP) technique is applied based on the properties of the LED’s dynamic range. The resultant weight-adjusted BDP (WA-BDP) scheme generates an interference-free matrix by the traditional BDP approach, and then tunes the weights of the LEDs such that improved channel gains can be obtained. We verify the theoretical analysis by simulation results, which demonstrate the superiority of the proposed scheme in terms of the bit error rate (BER) performance.
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