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Blind second-order identification of FIR channels: forced cyclostationarity and structured subspace method

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2 Author(s)
A. Chevreuil ; Dept. Signal, Telecom Paris, France ; P. Loubaton

We address the problem of blind second-order equalization of scalar-valued polynomial channels. When an almost periodic deterministic function modulates the initial symbol sequence, the observation exhibits second-order cyclostationarity. This property is shown to give rise to a structured spectral factorization problem. The identification of the unknown channel is then always possible via a structured version of the subspace method. No assumption on the channel is required, except the knowledge of a lower bound of the order. The estimate is consistent, and this property remains unchanged in the presence of stationary noise and when the symbols are colored.

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IEEE Signal Processing Letters  (Volume:4 ,  Issue: 7 )