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Abstract
This paper proposes the conception of envelope time reversal (TR). Using different frequencies for signal modulation and demodulation, we give the theoretic derivation of one novel frequencydifference method, which demonstrates excellent TR focusing characteristic for envelope signal. In the following experiment, we carry out envelope TR on 100 MHz, 300 MHz and 500 MHz baseband signals separately. Being consistent with theoretic derivation, the experiment result verifies the feasibility of envelope TR.