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A new frequency estimator of sinusoid based on interpolated FFT amplitudes is proposed. Firstly, zeros of length N are padded to the sinusoid sampled data of length N in the time domain. Next, 2N-point FFT is performed and the coarse estimation is made by searching the location of the spectrum line with maximum amplitude. Finally, the fine estimation is made by utilizing the amplitudes of the spectrum...
The micro-Doppler effect on a flying spinning target, introduced by the rotation, would modulate the receiving signal with SFM (Sinusoidal Frequency Modulation), and we usually use some TF (Time-Frequency) analysis methods with complex calculation to estimate the frequency. As to the issue of the complexity of the classic TF method, a method based on the piecewise FFT was proposed in this paper. With...
Structured LDPC, such as RA, IRA, ARA, QC-LDPC etc., are some important LDPC codes, these codes usually have very good performance and facilitate the implementation of encoding and decoding for the structural features they have. A new method for the encoding of the structured LDPC codes has been presented, namely FFT-based parallel encoding algorithm, which uses FFT to realize the parallel encoding...
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