Soft-chip combining MIMO multicarrier CDMA antijam system

Authors:
M. M. Asadullah Galib;Gordon L. Stuber
Affiliations:
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA;School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA
Venue:
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Year:
2006

Citing 5
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Abstract

Multicarrier code division multiple access (MCCDMA) 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 10-4 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).