Channel-Adapted Space-Collaborative Constellation Design for MIMO Visible Light Communication
Multi-Input Multi-Output (MIMO) holds great potential in the high-speed transmission of Visible Light Communication (VLC). However, the inter- channel interference (ICI) in the MIMO-VLC channel is directly related to the geometrical locations of transmitters and receivers, which brings a challenge to the receiver mobility. In this paper, a general design criterion of the channel-adapted space- collaborative constellation (CASCC) is established by making the uncontrollable ICI controllable, whilst considering the channel into our optimization model. Under the prescribed criterion, a regular CASCC is particularly designed for 2 &#x000D7; 2 MIMO-VLC systems in terms of the basic 4-point constellation and the high-order constellation. By developing the properties within our criterion, the computational complexity of the CASCC design is reduced. Furthermore, the performance of CASCC is discussed through extensive theoretical and simulation analysis. The results show that our proposed CASCC obtains higher SER performance gains and more robustness compared with the conventional MIMO-VLC schemes, for a broad range of channels discussed in this paper.