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As intermodulated sinusoids are generated when a nonlinear system is subject to multiple fundamental frequencies, an approach is proposed in this paper to detect and to estimate, or simply to retrieve the intermodulated sinusoids. It is shown that both detection and estimation performance are improved by using the intermodulation relationship as an additional constraint. Although the periodogram method...
In this correspondence, the problem of estimating the intermodulated frequencies of sinusoidal signals with unknown fundamental frequencies is investigated. It is shown that by formulating the intermodulation structure as a constraint in the estimation of these frequencies, a smaller Cramer-Rao lower bound (CRLB) can be obtained, that is, a more accurate estimate of these frequencies can be obtained...
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