UP Paper 1492 US-T-KDOWN
Soft-Chip Combining MIMO Multicarrier CDMA Antijam System
Stuber,GordonGeorgia Institute of Technology
M. M.,GalibGeorgia Institute of Technology
Multicarrier code division multiple access (MC-CDMA) systems using complex quadratic spreading sequences facilitate frequency- or time-domain chip combining to mitigate different types of jamming. In this paper, anti-jamming receivers estimating the jammer state information (JSI) and using them for chip combining in frequency- and time-domains to suppress partial band noise jamming (PBNJ) and pulse jamming (PJ), respectively, are studied for a turbo coded constant envelope multicarrier code division multiple access (MC-CDMA) system with cyclic delay diversity (CDD). A soft JSI (S-JSI) based chip combining technique is proposed that outperforms the conventional hard JSI (H-JSI) based chip combining by at least 1.75 dB at BER of 10e-4 under both types of jamming. It is also shown that without pilot assisted a priori JSI, iterative despreading (includes JSI estimation and chip combining), demapping and decoding (IDDD) has almost similar performance as one-shot despreading followed by iterative demapping and decoding (IDD).
Gordon L. Stuber received the B.A.Sc. and Ph.D. degrees in Electrical Engineering from the University of Waterloo, Ontario, Canada, in 1982 and 1986 respectively. In 1986, he joined the School of Electrical and Computer Engineering, Georgia Institute of Technology, where is the Joseph M. Pettit Chair Professor in Communications. Dr. Stuber was co-recipient of the IEEE Vehicular Technology Society Jack Neubauer Memorial Award in 1997 for the best systems paper. He became an IEEE Fellow in 1999 for contributions to mobile radio and spread spectrum communications. He received the IEEE Vehicular Technology Society James R. Evans Avant Garde Award in 2003 for contributions to theoretical research in wireless communications. Dr. Stuber served as General Chair and Program Chair for several conferences, including VTC'96, ICC'98, MMT''00, CTW'02, and WPMC'02. He is a past Editor for IEEE Transactions on Communications (1993-1998), and served on the IEEE Communications Society Awards Committee (1999-2002). He an elected member of the IEEE Vehicular Technology Society Board of Governors (2001-2003, 2004-2006) and received the Outstanding Service Award from the IEEE Vehicular Technology Society.