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Using UWB for wireless short range, low rate communication is attracting growing interest due to its low power consumption and very high bandwidth. Moreover, it is able to offer accurate localization in the range of few centimeters. Regarding these qualities, it is desirable to design a IR-UWB transceiver which consumes as few power as possible when it is applied for battery driven wireless sensors. For this reason a baseband design and performance of IR-UWB receiver based on the standard IEEE.802.15.4a was investigated in this paper with particular emphasis on energy efficient synchronization and preamble detection.