UWB channel estimation with various sampling rate options

In this paper, channel estimation algorithms for multiuser ultrawideband (UWB) communication systems using symbol-spaced, frame-spaced, and chip-spaced sampling are proposed and analyzed. Assuming perfect synchronization to the desired multipath delays, symbol-spaced sampling allows both training-based, and semi-blind channel estimation. Increasing the sampling rate introduces more complexity, however, this allows additional signal processing capability, enabling improved receiver performance. By processing the frame-spaced samples, simple and low complexity pulse-discarding channel-estimators can be implemented to suppress multiuser interference effects. Chip-spaced sampling allows implementation of all-Rake (ARake) receivers using the least-squares channel estimation, and without the need for multiple analog matched filters