Combined FRM and GDFT filter bank designs for improved nonuniform DSA channelisation

Multi standard channelization for base stations is a big application of Generalised Discrete Fourier Transform Modulated Filter Banks (GDFT-FB) in digital communications. For technologies such as Software-Defined Radio (SDR) and Cognitive Radio (CR), non uniform channelizers must be used if frequency bands are shared by different standards. However, GDFT-FB based non-uniform channelizers can suffer from high filter orders when applied to wideband input signals. In this paper various combinations of GDFT-FB with the Frequency Response Masking (FRM) technique are proposed and evaluated for both uniform and non uniform channelization applications. Results show that the proposed techniques achieve savings in both the number of filter coefficients and the number of operations per input sample