Loop-Back Interference Suppression for OFDM Signals via Sampled-Data   Control
  In this article, we consider the problem of loop-back interference suppression for orthogonal frequency division multiplexing (OFDM) signals in amplify-and-forward single-frequency full-duplex relay stations. The loop-back interference makes the system a closed-loop system, and hence it is important not only to suppress the interference but also to stabilize the system. For this purpose, we propose sampled-data $H^{\infty}$ design of digital filters that ensure the stability of the system and suppress the continuous-time effect of interference at the same time. Simulation results are shown to illustrate the effectiveness of the proposed method. 
Hampei Sasahara, Masaaki Nagahara, Kazunori Hayashi, Yutaka Yamamoto
cs.SY cs.IT math.IT math.OC