Signal connection among two-dimensional communication tiles by direction-dependent frequency shift

In this paper, we aim to construct a communication environment all over the room floor by using two-dimensional communication (2DC) sheets. A scheme that realized such an environment by laying the 2DC sheets on all over the floor like carpet tiles have been proposed. In the system, oscillation loop can be formed due to the amplifier built in the 2DC tiles for compensation of signal attenuation. In this paper, we propose, to avoid oscillation loop, a 2DC tiles connection scheme based on FDD system that divides frequency into two frequency bands assigned for the uplink and for the downlink, and present an implementation example.