Extended Noisy-Channel Models for Capacitively Coupled Personal Area Network Under Influence of a Wall

Many application systems of capacitively coupled personal area networks (CC-PANs) are installed in the vicinity of walls. We therefore investigated noisy-channel models of a CC-PAN in consideration of a wall and a noise-reduction mechanism (NRM). Equivalent circuits representing the proposed channel models can be reduced to a Wheatstone bridge. It is found from the model that the noise is suppressed when the Wheatstone bridge is balanced. In practical CC-PAN systems, such a balanced condition can be realized by tuning a variable capacitor introduced as the NRM. The validity of the noisy-channel models and NRM is experimentally demonstrated.