Implementation and Performance Evaluation of IEEE 802.15.4 LECIM DSSS PHY at 2.4 GHz
Low Power Wide Area Networks (LPWANs) are thought to provide low-cost coverage for massive numbers of devices. Due to the many business opportunities ahead, the market is currently highly fragmented with many competing waveforms. In order to establish a basis for the comparison of LPWAN waveforms, we present the first open-source, standards-compliant implementation of the IEEE 802.15.4 Low Energy Critical Infrastructure Monitoring (LECIM) Direct Sequence Spread Spectrum (DSSS) physical layer including the fragmentation sublayer in the GNU Radio framework. This Software Defined Radio-based testbed enabled us to conduct the first field trials evaluating the performance in the highly-congested 2.4 GHz band with different configurations at various receiver locations. Our results indicate that there is a considerable potential for LPWANs in the 2.4 GHz range, even in the presence of many uncontrolled Wi-Fi access points.
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