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In asynchronous communication system, such as MANET or uplink of CDMA system, MAI (Multiple Access Interference) is a problem that cannot be ignored. To suppress the effect of MAI, this paper introduces a new mix-carrier method in asynchronous CDMA system. The proposed method uses both cosine and Chirp as carriers, by using frequency domain filter and Fractional Fourier domain filter at the receiver...
A subchip multipath search method for DSSS system based on fractional Fourier transform(FrFT) is proposed. Chirp signal is used as pilot signal, the multipath chirps are processed by FrFT at receiver, then the relative delays between multipath chirps can be calculated after detecting peak positions in FrFT domain according to the linear relationship between the relative delay in time domain and difference...
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