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In this paper a new subspace method for blind estimation of time-varying channels under STBC transmissions has been proposed. Specifically, the time-varying MIMO channel has been deterministically represented by means of a basis expansion model, which permits the reduction of the number of parameters to be estimated. The proposed technique is solely based on the SOS of the received signals, and therefore it is independent of the specific signal constellation. Furthermore, its computational complexity reduces to the extraction of the main eigenvector of a generalized eigen-value problem and, unlike previous approaches, it is able to recover the channel in a completely blind manner even for non-orthogonal STBCs.
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