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In this paper, the authors propose a Semi-Definite Programming (SDP) Relaxation based Semi-Blind (SRSB) channel estimation scheme for frequency-selective Multiple-Input Multiple-Output (MIMO) Multi-Carrier Code Division for Multiple Access (MC-CDMA) systems. The SRSB scheme is derived from the Multi-path Multi-carrier De-correlator (MMD) based robust channel estimation framework developed for MIMO MC-CDMA. They formulate the semi-blind channel estimation scenario for MIMO MC-CDMA systems as a convex Quadratic Programming (QP) problem. Subsequently with an approximate rank relaxation this is recast as an equivalent SDP problem.
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