Algorithm on Complex Polyphase Filters Without blind-zone and FPGA Design

The channelized and decimation algorithm plays an important role in wideband digital channelized receivers. For this purpose,this paper first analyzes the improved algorithm of complex polyphase filters and its mathematical module,which meet the requirement of receiving signals without leaking. Based on this module,we present the FPGA design method of complex polyphase filters. According to the relationship between the number of channels and decimation,this method completes delay and decimation with customizable module and timing coordination; MAC unit completes filter operation; IP core completes FFT. The module uses ping-pong RAM and pipeline architecture. The result shows that this method is different from the rotary switch structure,which can complete delay and decimation while the number of channels is not equal to decimation.