Multiband Digital Filter Design for WCDMA Systems

This paper introduces structure characteristics, the basic principles of the finite impulse response (FIR) digital filter, and design methods based on MATLAB simulation. FDATool in MATLAB is used to determine filter coefficients and simulate FIR bandpass filters by means of window function methods. There are several types of window function such as Hamming, Hanning and Blackman. We bring all of window functions to compare its results. It can be shown that a Blackman window has the highest performance. The FIR filters are simulated using a system generator for implementation on FPGA. The results prove that the performance of the designed filter reaches the appointed requirement.