A novel and efficient compressive multiplexer for multi-channel compressive sensing based on modulated wideband converter

A novel and efficient Sub-Nyquist architecture for multi-channel compressive sensing based on compressive multiplexer (CMUX) and modulated wideband converter (MWC) is proposed with the name of CM-MWC. Each channel in this multi-channel receiver system is mixed down to baseband, and then randomly modulated by a periodical pseudo-random sequence. The randomly modulated channels are summed together and then the outcome is fed into a filterbank consist of M uniform subfilters in order to obtain compressed samples. Compared with CMUX, periodical pseudo-random sequences are used to modulate the input signal so that the proposed architecture can reconstruct multi-band signals. Compared with MWC, this architecture can be applied to multi-channel system. Meanwhile, the requirements of specification for mixing pseudo-random sequences generator and analog to digital converter (ADC) devices can be further reduced. Simulation experiments verify the theoretical results and show the proposed algorithm is feasible.