MODIFIED DFT SBC-FDFMUX FILTER BANK SYSTEMS FOR FLEXIBLE FREQUENCY REALLOCATION

This paper presents a novel digital MIMO filter bank technique for modern broadband multibeam communcations satellite systems, which efficiently exploit available bandwidth by providing different users with different bandwidths for different types of services. This necessitates a flexible and dynamic resource reallocation, where the assumed traffic is unsymmetrical, i.e. the number and bandwidths of incoming and outgoing FDM signals are unequal. This paper details the SISO SBC-FDFMUX filter bank based on critically sam-pling Modified DFT (MDFT) filter banks and extends it to critically sampling symmetrical MIMO MDFT SBC-FDFMUX systems. The paper concludes with simulation results showing the potential of this filter bank approach for flexible frequency reallocation. 1