Pilot-based Bayesian Channel Norm Estimation in Rayleigh Fading Multi-antenna Systems
2008 (English)In: Proceedings of the twentieth Nordic Conference on Radio Science and Communications, Växjö, Sweden, 2008Conference paper (Other academic)
Pilot-based estimation of the squared Euclidean norm of the channel vector of a Rayleigh fading system is considered. Unlike most previous work in the area of estimation of multiple antenna channels, we consider Bayesian estimation where the long-term channel statistics are known a priori. Closed-form expressions of the minimum mean square error (MMSE) estimator and its mean squared error (MSE) are derived for the cases of either an unweighted or a weighted unitary pilot matrix. The problem of finding the optimal pilot weighting, in the sense of minimizing the average MSE, is solved and a simple algorithm is proposed to achieve this power allocation numerically. The numerical evaluation shows that an optimal weighting can significantly improve the estimation quality in spatially correlated environments.
Place, publisher, year, edition, pages
Bayesian channel estimation, channel norm, rayleigh fading, multi-antenna systems, weighted pilot matrices
IdentifiersURN: urn:nbn:se:kth:diva-45080OAI: oai:DiVA.org:kth-45080DiVA: diva2:451749
RadioVetenskap och Kommunikation (RVK)
QC 201111012011-11-012011-10-262012-01-23Bibliographically approved