Statistical Covariance-Matching Based Blind Channel Estimation for Zero-Padding MIMO - OFDM Systems

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Provided by: EURASIP
Topic: Mobility
Format: PDF
The authors propose a statistical covariance-matching based blind channel estimation scheme for Zero-Padding (ZP) Multiple Input Multiple Output (MIMO) - Orthogonal Frequency Division Multiplexing (OFDM) systems. By exploiting the block Toeplitz channel matrix structure, it is shown that the linear equations relating the entries of the received covariance matrix and the outer product of the MIMO channel matrix taps can be rearranged into a set of decoupled groups. The decoupled nature reduces computations, and more importantly guarantees unique recovery of the channel matrix outer product under a quite mild condition. Then the channel impulse response matrix is identified, up to a Hermitian matrix ambiguity, through an eigen-decomposition of the outer product matrix.
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