A novel double-source cell configuration for indoor optical attocell networks

In this paper, a novel double-source cell configuration for indoor optical wireless cellular networks is proposed. In this configuration, each optical cell consists of two access points (APs) which transmit the same information signals, but with opposite polarity. When the optical sequences from the same optical cell are added up, they interfere destructively. This characteristic is beneficial for an angle diversity receiver (ADR) which enables the destructive interference to be exploited in order to reduce inter-cell interference. The results clearly indicate that the double-source cell configuration significantly outperforms the conventional single-source cell configuration when an ADR receiver is used. In this study, four signal combination schemes, the equal gain combining (EGC), select best combining (SBC), maximum ratio combining (MRC) and optimum combining (OPC) are implemented to enhance the performance of the ADR.