Acoustic broadband communications over deep drill strings using adaptive OFDM. - Miguel Angel Gutierrez-Estevez; Udo Krüger; Kirsten A. Krueger; Konstantinos Manolakis; Volker Jungnickel; Katrin Jaksch; Kai Krüger; Stefan Mikulla; Robert Giese; Michael Sohmer; Matthias Reich (WCNC, 2013)