The capacity for the linear time-invariant Gaussian relay channel - Youngchul Sung; Cheulsoon Kim (CoRR, 2011)

Asymmetric complex signaling for full-duplex decode-and-forward relay channels. - Cheulsoon Kim; Eui-Rim Jeong; Youngchul Sung; Yong Hoon Lee (ICTC, 2012)

A Joint Time-Invariant Filtering Approach to the Linear Gaussian Relay Problem. - Cheulsoon Kim; Youngchul Sung; Yong Hoon Lee (IEEE Trans. Signal Process., 2012)

Reduced Complexity Beamforming with Optimal Power Allocation in Two-Way Multi-Antenna Relay Systems. - Byungjin Chun; Cheulsoon Kim; Yong Hoon Lee (IEEE Commun. Lett., 2013)