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This paper examines the performance of a method for carrier frequency offset estimation. Although the method is derived from a maximum likelihood framework, its performance no longer achieves the Cramer-Rao bound when multiple OFDM blocks are in use. The phenomenon is verified using statistical estimation theory. An improved method is also proposed.
In this paper, a blind algorithm is proposed for channel and CFO estimation in zero-prefix OFDM systems. By exploiting the greatest common divisor structure of the received signal for two or more symbols, the algorithm yields joint estimates of channel parameters and carrier frequency offset. It provides error-free message recovery at moderate SNRs.
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