Joint SSK Assisted by Mirror Array Grouping and LEDs in Indoor VLC System

In the mirror array-assisted indoor visible light communication (VLC) system, activating all mirrors simultaneously can result in a complex system design and excessive consumption of resources. To address this issue and enhance the spectral efficiency, this paper proposes a joint space shift keying (SSK) technique, which is achieved by jointly utilizing the mirror array grouping and LED activation procedures in indoor VLC systems. By doing so, the SSK scheme utilizes the activation status of mirror array blocks to transmit information and can avoid excessive utilization of mirror resources while achieving efficient and reliable communication. The fairness of the considered system is improved by introducing a mirror array grouping technique that relies on the channel gains. Concurrently, a novel joint SSK modulation scheme is proposed, whereby the mirror array block is activated in conjunction with the LED. This scheme employs a information bit-based activation technique to enhance spectral efficiency. Additionally, the low complexity orthogonal matching pursuit (OMP) detection and the optimal maximum likelihood (ML) detection algorithms are employed. The effectiveness of the proposed schemes has been confirmed through extensive simulations.