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This paper reports an implementation of the PHY specifications of the IEEE802.15.4 standard for the frequency band 868 915 MHz on a Software DefinedRadio (SDR) platform. This standard is defined for low power, low data rate andlow cost wireless networks. These specifications are used by the Zigbeetechnology for various applications such as home automation, industrymonitoring or medical surveillance. Several hardware PHY 868/915 MHz band IEEE802.15.4 transceiver implementations have been already reported on ASIC and FPG[1] [2]. SDR offers one possibility to realize a transceiver with highflexibility and reconfigurability [3]. The whole transmitter and receiver chainhas been defined in software using the GNU Radio software project [4] and theUSRP (Universal Software Radio Peripheral) platform from Ettus Research [5].Two new blocks have been added to the GNU Radio project, one for the DirectSequence Spread Spectrum and the second for the reconstruction of the packets.The experimentations have been performed in a noisy environment and the PER,BER and SNR have been computed. The obtained results are coherent with what canbe expected from the theory.

IEEE 802.15.4 transceiver for the 868/915 MHz band using Software Defined Radio