The Designing Digital Down Conversion Systems design example, featuring cascaded-integrator-comb (CIC) and finite impulse response (FIR) Compiler functions, demonstrates a multichannel, multirate digital system using digital signal processing (DSP) intellectual property (IP).
Sample rate conversion has a wide range of applications in modern digital systems, especially wireless communications systems such as WCDMA and WiMAX systems. Efficient implementation of decimation and interpolation can be accomplished by concatenating CIC and FIR filters.
This example demonstrates a data rate down conversion system that can be commonly seen in time division multiplexing (TDM) WiMAX receivers. The overall system diagram is shown in Figure 1.