AT TOP	Paper 954	US-T-O	DOWN
Link-Adaptive Cooperative Communications without Channel State Information
Giannakis,Georgios B.		University of Minnesota
Wang,Tairan		University of Minnesota
Cano,Alfonso		Rey Juan Carlos University
Link-adaptive regeneration (LAR) is a novel relaying strategy other than decode-and-forward (DF) or amplify-and-forward (AF) in user cooperative communications. Requiring simple channel state information (CSI) of both the source-relay and the relay-destination links, LAR has been shown to achieve full diversity using coherent modulations. In this paper, we generalize the idea of LAR into differential and non-coherent cooperative transmissions, which do not require CSI at either relays or destination. We prove that full spatial diversity gain can still be achieved in such systems, without incurring the overhead of cyclic redundancy check (CRC) codes. Simulations demonstrate that the proposed scheme is universally applicable to multi- branch and multi-hop cooperation regardless of the constellation size and outperforms existing alternatives.
Georgios B. Giannakis (S’84–M’86–SM’91–F’97) received the Diploma in electrical engineering from the National Technical University of Athens, Athens, Greece, in 1981, and the M.Sc. degree in electrical engineering, the M.Sc. degree in mathematics, and the Ph.D. degree in electrical engineering, all from the University of Southern California (USC), Los Angeles, in 1983 and 1986, respectively. After lecturing for one year at USC, he joined the University of Virginia, Charlottesville, in 1987, where he became a Professor of electrical engineering in 1997. Since 1999, he has been a Professor with the Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, where he now holds an ADC Chair in Wireless Telecommunications. Dr. Giannakis is the (co-)recipient of six paper awards from the IEEE Signal Processing (SP) and Communications Societies (1992, 1998, 2000, 2001, 2003, and 2004). He also received the SP Society’s Technical Achievement Award in 2000. He served as Editor-in-Chief for the IEEE SIGNAL PROCESSING LETTERS, as Associate Editor for the IEEE TRANSACTIONS ON SIGNAL PROCESSING and the IEEE SIGNAL PROCESSING LETTERS, as Secretary of the SP Conference Board, as member of the SP Publications Board, as member and Vice Chair of the Statistical Signal and Array Processing Technical Committee, as Chair of the SP for Communications Technical Committee, and as a member of the IEEE Fellows Election Committee. He has also served as a member of the the IEEE-SP Society’s Board of Governors, the Editorial Board for the PROCEEDINGS OF THE IEEE, and the steering committee of the IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS.