Combined PA/NPA CFO Recovery for FBMC Transmissions Over Doubly-Selective Fading Channels

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Executive Summary

This paper deals with Carrier Frequency Offset (CFO) recovery for burst-mode filter-bank multicarrier transmission over channels affected by severe time-frequency selective fading. Unlike previously proposed algorithms, whereby frequency is recovered either relying on known pilot symbols multiplexed with the data stream (pilot-aided, or PA, approach), or exploiting specific properties of the multicarrier signal structure in a Non-Pilot-Aided (NPA) fashion, here the authors present and discuss an algorithm based on the maximum likelihood principle, which can be qualified as combined PA/NPA since it takes advantage both of pilot symbols and also indirectly of data symbols through knowledge and exploitation of their specific modulation format.

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