Blind Identification of MIMO Channels in Zero Padding Block Transmission Systems

We propose a blind identification method for multiple-input multiple-output (MIMO) zero-padding block transmission systems based on an eigendecomposition approach. With zero padding, the relation between the covariance matrix of the received data and the channel product matrices becomes highly structured. The structure makes it easy to estimate the channel product matrices and the noise covariance matrices. Eigendecomposition of a Hermitian matrix formed by the channel product matrices yields the channel impulse response up to a unitary matrix ambiguity. The channel noise may be temporally and spatially colored, the channel needs not be irreducible or column reduced, and there can be more outputs or more inputs. Simulation results are used to demonstrate the performance of the proposed method