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For wideband configuration double carrier (WCDC) signals, a novel phenomenon is analyzed in this paper, i.e., when the data rate is lower than a threshold, the integer loop-delay estimation (ILDE) accuracy sharply declines when traditional time-delay estimation methods are used in a digital predistortion subsystem. Assisted by the equivalent bandwidth of a single-carrier signal, a proposed cross-correlation...
A high-efficiency time delay estimation method is presented to obtain the accurate loop delay (including integer and fractional loop delay) between the input signal and the time delayed feedback signal in digital predistortion subsystem within the same process. Compared with the conventional, a sampling position adjusting scheme for complex signals using the piecewise-parabolic filter assisted by...
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