A Multistage Approach to the Design of Prototype Filters for Modulated Filter Banks
Neela. R. Rayavarapu, Neelam Rup Prakash · 2010
When filter banks are used in multicarrier modulation the transition bandwidth of the filter is usually very narrow. This is because the bandwidth of the filters is determined by the number of subchannels and the greater the number of channels lesser will be the transition bandwidth. The order of the filter being inversely proportional to the transition bandwidth is generally very high. Hence computational complexity is also very high. We propose a method that will help reduce this complexity by designing the decimators/interpolators in the subchannels using a multistage approach. We compare the saving obtained in comparison to direct design approaches. We will also compare the performance of a cosine modulated filter bank designed in this way with direct design methods.