IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS (SUBMITTED) i Asynchronous Multiuser Reception for OFDM in Underwater Acoustic Communications Zhaohui Wang, Student Member, IEEE, Shengli Zhou, Senior Member, IEEE, Josko Catipovic, Member, IEEE, and Peter Willett, Fellow, IEEE Suggested Editorial Areas: • Multicarrier communications • Multiuser detection • Multiple access techniques Manuscript submitted January 12, 2012. Z.-H. Wang, and S. Zhou are supported by the ONR grant N00014-09-1-0704 (PECASE) and the NSF grant ECCS-1128581. Z.-H. Wang, S. Zhou, and P. Willett are with the Department of Electrical and Computer Engineering, University of Connecticut, 371 Fairfield Way U-2157, Storrs, CT 06269, USA (email: {zhwang, shengli, willett}@engr.uconn.edu). J. Catipovic is with the Naval Undersea Warfare Center, Newport, RI 02841, USA (email: josko.catipovic@navy.mil). Contact author: S. Zhou, Tel.: (860) 486-4593, email: shengli@engr.uconn.edu January 12, 2012 DRAFT