On the pilot spacing constraints for continuous time-varying fading channels

Authors:
Stefano Savazzi;Umberto Spagnolini
Affiliations:
Dipartimento di Elettronica e Informazione, Politecnico di Milano, Milano, Italy;Dipartimento di Elettronica e Informazione, Politecnico di Milano, Milano, Italy
Venue:
IEEE Transactions on Communications
Year:
2009

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Abstract

In common wireless systems pilot placing can be interpreted as a way to sample the channel with some degree of accuracy. In this letter we investigate the necessary conditions on the pilots spacing for time-varying fading to guarantee a specified average bit error rate. These constraints are evaluated in closed form for large SNR and small fading dynamics and specialized for varying fading correlation and coded/uncoded binary transmissions.