A novel delay signed amplitude modulation for spatially multiplexed MIMO optical links

Visible Light Communication is recognized as an effective solution to the future technological challenges rising with the forthcoming 6G Era, allowing fast data transmission in a green and low cost fashion especially in indoor environment. In this context, Multiple-Input Multiple Output architectures are typically considered to achieve high data rates, even though crosstalk can be an issue. In this contribution, we present a novel transmission technique where delay signatures are employed to separate in time the spatially multiplexed signals, thus reducing the level of crosstalk. Basing on such scheme, we propose a successive interference cancellation aided detection mechanism that, by exploiting the knowledge of signatures, allows the overlapping received symbols to be detected in a sequential fashion. Simulation results show that the proposed solution provides a convenient trade-off between rate and reliability performance, thus making it particularly effective in those propagation scenarios characterized by crosstalk.