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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...
A new digital differentiator-based demodulator in a zeroIF receiver for 2.4 GHz Zigbee applications is proposed. It receives the In-phase (I) and Quadrature-phase (Q) signals which are oversampled and quantized by a 4-bit ADC @ 8 MHz. Two one-order digital differentiators based on Taylor series, two multipliers and an adder are adopted to calculate the derivative of the signal phase. Then an Integrate-and-Dump...
In digital signal processing, it is difficult to achieve flexible arbitrary sampling rate conversion. As for this problem, a new algorithm is proposed to realize arbitrary variable up-sampling based on lookup table. The algorithm firstly constructs an original filter whose coefficients are stored in ROMs. Then the target filter is decimated from lookup table by mapping sampling rate as addressed....
This paper presents a wideband spectrum sensing methods based on the sparse fast Fourier transform applying for Eband, which can capture spectrum in real-time without sampling the signal at the Nyquist rate. Our approach builds on recent advances in the area of sparse Fourier transform. At first, we convert the signal of E-band to the baseband, and then sample the wide baseband signal at a low sampling...
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