The performance of multichannel random demodulator for multiband signals

This paper propose multichannel random demodulator (MCRD) system, which is block structured sparsity based of multiband signals. It is a kind of compressive sampling system. Each channel of the system firstly multiplies analog signal by a band of random sequence, the product is put into integrator and sampled at a low rate. ADC of this system only need to generate one sample which greatly reduce ADC design complexity. Perfect recovery from the proposed samples is achieved by processing all measurements jointly with orthogonal matching pursuit (OMP) algorithm. The simulation analyzes the compression rate, the number of effective sub-carriers and conversion rate of pseudorandom number generator impact on this system. The results show that MCRD system ensure perfect reconstruction performance for multiband signal that is sampled below the Nyquist rate. Specially, conversion rate impact on system performance would be greatly for higher sampling rate, select the appropriate conversion rates can improve the system performac-e while reducing system complexity.