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In this paper, we study distributed detection in ultrawideband (UWB) wireless sensor networks (WSNs) over frequency selective channels. Several schemes with different requirements on channel state information (CSI) are proposed, analyzed, and compared. We study the error exponent and asymptotic optimality for these schemes under different energy, and time-bandwidth product requirements. Our study shows that to achieve a nonzero error exponent, the no-feedback scheme requires large energy and time-bandwidth product but has advantages of no synchronization requirement and no feedback overhead. On the other hand, schemes requiring feedback are suitable for energy and bandwidth limited settings but require quasi-synchronization.