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The effects of partial substitution of Fe element for Ni element on the structure, martensitic transformation and mechanical properties of Ni50–xFexMn38Sn12 (x=0 and 3%, molar fraction) ferromagnetic shape memory alloys were investigated. Experimental results indicate that by substitution of Fe for Ni, the microstructure and crystal structure of the alloys change at room temperature. Compared with...
Chirp signal can be modulated to transmit digital data. We investigated quadrature phase shift keying (QPSK) modulation for chirp signals and analyzed the bit error rate (BER) performance in multipath fading channel. In receiver, synchronous demodulation is used to demodulate received chirp signal, and the output of multipath signal in matched filter has two factors to interfere with the decision...
Resolution of center frequency for linear frequency modulation (LFM) signals is related with many factors. In fractional Fourier domain, we investigated the relationship between center frequency resolution of two LFM signals and initial phase difference. By establishing center frequency resolution model of two LFM signals with the same amplitude, the same duration and the same chirp rate, we derive...
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