Definition of a SoC Architecture for a High-Rate Correlator Bank

Interest in indoor optical positioning systems has increased over the past decade, as they achieve an accuracy in the range of centimeters in three dimensions (3D) using light emitting diodes (LEDs) and photoreceptors. Due to the need of a high-rate position updating, these systems often pose challenges and issues when trying to achieve real-time prototypes capable of processing the incoming signals from the receivers to provide a final position estimate. In this context, this work presents a System-on-Chip (SoC) architecture for implementing the signal processing associated with an infrared positioning system, based on a set of four QADA photoreceptors acting as anchors at known positions and on a single LED to be positioned (more LEDs may be involved by implementing a medium access technique). The definition and design of the specific peripheral, that is integrated in the SoC architecture, is proposed, analyzing the effect of the corresponding fixed-point notation. The proposal has been successfully validated in a preliminary way by comparing the proposal’s results with certain test patterns at every stage.