2012/02/15 by Saeed Abdallah, Abdallah, Saeed, Ioannis N. Psaromiligkos +1
Computer Science · Mathematics · #FOS: Computer and information sciences #Information Theory (cs.IT) #Other Statistics (stat.OT) #cs.IT #math.IT #stat.OT
paper · pdf · doi:10.48550/arxiv.1202.3468
6 pages, 4 figures
arxiv created 2012/02/15 · arxiv updated 2012/02/17
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.