Abstract
In Visible Light Communications (VLC) with multiple transmitters sending information to multiple receivers simultaneously, the optical signals interfere due to the diffused light. The result is an Intensity-Modulation/Direct-Detection (IM/DD) Interference Channel (IC), whose capacity has not been investigated. The challenge in studying the capacity of the IM/DD IC is due to its non-negative inputs with mean optical power constraints on the one hand, and interference on the other hand. In this paper the capacity of the IM/DD IC is studied. Capacity inner and outer bounds are derived and evaluated. The inner bounds are based on treating interference as noise (TIN) and the Han-Kobayashi (HK) scheme. The outer bound is based on a Z-channel bound. The bounds are shown to coincide asymptotically at high signal-to-noise ratio (SNR) in the strong interference regime, leading to the characterization of the strong interference capacity at high SNR. The bounds are also compared numerically in the weak interference regime.
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