- G. K. Karagiannidis, A. S. Lioumpas, D. S. Michalopoulos, “Method and system of combination of signals with absence of estimation of channel gain, for application in receivers of wireless communication systems”. G.R. Patent 1006628 (B2).
- G. K. Karagiannidis, A. S. Lioumpas, D. S. Michalopoulos, “System and method for power distribution in wireless communication systems provided with multiple transmission antennae”. G.R. Patent 1006724 (B2).
- G. K. Karagiannidis, A. S. Lioumpas, “Apparatus method and system for real-time satellite-aided localization of collapsed or damaged buildings after an earthquake or other disasters”. G.R. Patent 1006784 (B2), Application number: GR20080100797.
- G. K. Karagiannidis, A. S. Lioumpas, D. S. Michalopoulos, “Method for combining signals at wireless receivers in the absence of channel gain estimation and apparatus therefor”. E.P. Patent 2214326 (A2) and U.S. Patent 2010232555.