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In this paper, we derive the Cramer-Rao bound (CRB) for blind channelestimation in redundant block transmission systems, a lower bound for the meansquared error of any blind channel estimators. The derived CRB is valid for anyfull-rank linear redundant precoder, including both zero-padded (ZP) andcyclic-prefixed (CP) precoders. A simple form of CRBs for multiple complexparameters is also derived and presented which facilitates the CRB derivationof the problem of interest. A comparison is made between the derived CRBs andperformances of existing subspace-based blind channel estimators for both CPand ZP systems. Numerical results show that there is still some room forperformance improvement of blind channel estimators.

Cramer-Rao Bound for Blind Channel Estimators in Redundant Block Transmission Systems