Noise-reducing architecture of compressed sensing receiver for IR-UWB ranging systems

A compressed sensing (CS) based impulse radio ultra-wideband (IR-UWB) receiver with two-path noise-reducing RF front-end architecture is proposed. By adding an identical input path (antenna and gain stage) together with a mixer, the noise in the received signal before feeding into the CS sampling block is alleviated comparing with the conventional CS receiver. Moreover, the mixing stage shifts the signal frequency spectrum to the lower band which eases the CS sampling hardware as well as the complexity of back-end signal reconstruction. Simulation results for a ranging system validate that the proposed CS receiver significantly outperforms the conventional one in both additive white Gaussian noise (AWGN) channel and IEEE 802.15.4a multi-path channel.