Performance of Transmitted Reference UWB Communications with Imperfect Power Control

Ultra-wideband (UWB) communications using transmitted reference (TR) have been studied in multipath, multiuser environments under the assumption that interfering users have the same power as the desired user at the receiver. This assumption frequently does not hold in ad-hoc wireless communications where centralized power control is not employed due to survivability and complexity constraints. In this paper, we investigate the performance of UWB networks where transmitters in close proximity ("high-power") to a receiver cause significant interference with the desired signal due to the much larger power levels of these signals. To mitigate the detrimental effect of high-power users, a technique which is called chip discrimination is applied at the receiver. Both "standard" transmitted reference (STR) and differential transmitted reference (DTR) schemes for multipath channels are considered. Results show dramatic improvement in performance for TR systems using chip discrimination when compared to conventional reception without centralized power control.