Optimization of Cosine Modulated Filter Bank for Narrowband RFI

An optimization scheme is developed for a cosine modulated perfect- reconstruction (PR) filter bank that is tailored to mitigate the effects of narrowband radio frequency interference (RFI). The conventionally used optimization criterion for bandpass filtering is to maximize the sidelobe attenuation by minimizing the stopband energy and minimizing the maximum stopband ripple. The proposed optimization scheme is designed particularly to combat RFI with completely known or partially known statistics. Simulation results for the scenario of strong narrowband RFI show that the proposed optimization scheme offers about 14% data rate improvement in the system´s data throughput when compared to the traditional schemes.