A digital channelizer design approach for broadband satellite communications based on frequency domain filter theory

Based on the frequency domain filtering (or FFT filtering) theory, a novel digital channelizer design approach is proposed in this paper, where the downlink broadband signal is formed after performing extracting, switching and synthesizing processing for the uplink broadband sub-signals. Our proposed digital channelizers apply for not only the scenarios with equal-bandwidth sub-signals, but also the scenarios with unequal-bandwidth sub-signals. Numerical simulation showed that, compared with the existing methods, our digital channelizers have advantage in performance and flexibility, and significantly reduces the computational complexity.