Xiaocheng Song

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Spectrum congestion problem is mainly caused by the inefficient spectrum usage. Cognitive radio (CR) and emerging soft decision CR (SDCR) have attracted wide interest as candidates to solve this problem. The former determines unused spectral regions and transmits overlay signals in these bands. The latter exploits both unused and occupied spectral regions(More)
The fractional Fourier transform (FRFT) has been shown to be a powerful analyzing tool in signal processing. Many properties of this transform have been currently derived as counterparts to the corresponding properties of the Fourier transform (FT), including the theory of the linear fractional shift invariant (LFSI) systems. However, the LFSI systems,(More)
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