A new low complexity reconfigurable channel filter architecture for software radio handsets

Software defined radio (SDR) is emerging as a powerful platform for future generation cellular systems due to its capability of operating according to multiple mobile radio standards. The most computationally intensive part of the digital front-end of the wideband receiver of a SDR is the channelizer, which operates at the highest sampling rate in the system. The channel filters in the channelizer extracts narrowband channels corresponding to varying communication standards from the wideband input signal. An architecture for implementing low complexity reconfigurable channel filter for the SDR mobile handsets, based on interpolation, decimation and frequency masking techniques is proposed in this paper. The proposed architecture is capable of extracting channels with different bandwidths corresponding to the channel spacing of different time-varying channels. Design examples show that proposed architecture offers 87.7 % complexity reduction over conventional Per-Channel approach.