Frequency-Selective Wallpaper for Reducing Interference While Increasing MIMO Capacity in Indoor Environments

The design and features of frequency-selective wallpaper created for attachment onto regular walls in order to filter out signals operating at 5 GHz while at the same time allowing the desired radio communication services to propagate through such walls are presented. An analysis of the characteristics of the radio channel evaluated in a typical indoor environment, when considering either regular walls or walls with the designed wallpaper, is performed through a ray-launching programme for both single input single output (SISO) and multiple input multiple output (MIMO) systems. In this way, parameters such as the signal to interference ratio, power delay profile, and channel capacity are obtained and compared for the two mentioned scenarios (with and without wallpapers).