Efficient filterbank channelizers for software radio receivers

For cellular software radio receivers, this paper presents a computationally efficient algorithm for extracting individual radio channels from the output of the wideband A/D converter. In a software radio, the extraction of individual channels from the output of the wide band A/D converter is by far the most computationally demanding task; hence, it is very important to devise computationally efficient algorithms for this task. Our algorithm is obtained by modifying the DFT filter bank structure that is well known in the multi-rate signal processing literature (Scheuermann and Gockler, 1981; Vaidyanathan, 1990). We show that the complexity of the proposed algorithm is significantly less (2×-50×) than the complexity of the conventional channelizers