This paper focuses on the estimation of large carrier frequency offsets in QPSK modulated signals. A common approach is based on searching for the maximum of a likelihood function. This search must be done operating over the same block of samples, in order to avoid a noisy likelihood curve that can lead to an erroneous estimate. We propose an efficient iterative algorithm that works with different blocks of data. This way, the need for memory is removed, and implementation costs are reduced. Additionally, the new algorithm can be adapted to the SNR in run-time.
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