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Partially-Blind Estimation of Reciprocal Channels for AF Two-Way Relay Networks Employing M-PSK Modulation

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2 Author(s)
Abdallah, S. ; Electr. & Comput. Eng. Dept., McGill Univ., Montreal, QC, Canada ; Psaromiligkos, I.N.

We consider the problem of channel estimation for amplify-and-forward two-way relays assuming channel reciprocity and M-PSK modulation. In an earlier work, a partially-blind maximum-likelihood estimator was derived by treating the data as deterministic unknowns. We prove that this estimator approaches the true channel with high probability at high signal-to-noise ratio (SNR) but is not consistent. We then propose an alternative estimator which is consistent and has similarly favorable high SNR performance. We also derive the Cramer-Rao bound on the variance of unbiased estimators.

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Wireless Communications, IEEE Transactions on  (Volume:11 ,  Issue: 5 )