Cyclostationary Source Separation in the Near-Field of Electronic Devices

The electromagnetic field (EMF) emitted unintentionally by the printed circuit board (PCB) of an electronic device may cause interference to other devices in the vicinity of the PCB and thus, degrade their performance. The radiated EMF is stochastic in nature and usually contains cyclostationary components due to the data transferred between separate blocks along the surface of the PCB [1], [2]. Cyclostationarity of the emitted EMF may occur due to some regular processes intrinsic to the operating mode of the electronic device. For example, the electronic device could be programmed for sending several digital sequences carrying some coded information from the central processor unit (CPU) to some digital blocks (memory, connectors, and so on) on the surface of the PCB. These data sequences, when being sent over the strip lines of the multilayer PSB, usually have different physical parameters such as the duration of the single bit or bit rate, for reducing the interference due to the coupling between strip lines of the PCB.