Parallelisation of Digital Signal Processing in Uniform and Reconfigurable Filter Banks for Satellite Communications

Abstract — Modern satellite communication calls for novel and flexible concepts for de- and remultiplexing of wide-band FDM-signals in conjunction with beam switching on-board a satellite. For this application, two highly efficient approaches to uniform and yet reconfigurable digital filter banks are known: i) the complex-modulated polyphase filter bank, and ii) the tree-structured filter bank. Channelising and remultiplexing of (ultra-)wide-band FDM-signals require high end sample rates that, often, range beyond technological limit (e.g.> 1GHz). A remedy is to process the signals at a lower rate in a parallel manner. While the polyphase approach i) applying one-step sample rate alteration (down/up-sampling) inherently operates in parallel, the hierarchical ap-proach ii) being based on stepwise sample rate alteration calls for the parallelisation of, at least, the high rate stages. In this contribution, the systematic sample-by-sample process-ing procedure for parallelisation of multirate systems by Groth is recalled. It is applied to the parallelisation of a novel class of tree-structured filter banks: The various steps towards parallelisation of the high rate front end of the FDM-demultiplexer part of the filter bank are described in detail. I