Polyphase channelizer as bandpass filters in multi-standard Software Defined Radios

Abstract

The aim of this work is to design efficient bandpass filters for multistandard software defined radios. Software Defined Radio (SDR) based applications which demand high sampling rate to eleminate the most of the analog components require high-performance technology and digital signal processing methods to handle and process the high sample rate data. State of the art technology such as FPGAs can support several hundred MHz of I/O data transfer rate. The internal hardware architecture, however, would limit the maximum operating frequency of the design. An alternative is therefore to use advanced DSP methods to overcome this bottleneck. Polyphase channelizers having spectral shifter to move the filter position are used in a scenario of dual standard (WLAN and UMTS) SDR receiver for the bandpass filtering. It will not only split the data in multiple paths to reduce the per arm data rate but the filter also operates at lower rate than the input sample frequency. Furthermore it can also eleminate the need of IQ demodulator.