In this paper the role of the output SNR, a metric commonly used to assess the acquisition performance and compare different acquisition algorithms, is discussed. It is shown that the output SNR is unable to completely characterize an acquisition algorithm and that alternative metrics should be adopted for the analysis of the detection process. Several acquisition algorithms are considered and, for each case, the expression of the output SNR is provided, showing that a direct comparison of these algorithms cannot be provided in terms of this metric.
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