Harvesting Devices’ Heterogeneous Energy Profiles and QoS Requirements in IoT: WPT-NOMA vs BAC-NOMA

The next generation Internet of Things (IoT) exhibits a unique feature that IoT devices have different energy profiles and quality service (QoS) requirements. In this paper, two spectrally efficient transmission strategies, namely wireless power transfer assisted non-orthogonal multiple access (WPT-NOMA) backscatter communication (Back-Com) NOMA (BAC-NOMA), are proposed by utilizing employing spectrum cooperation among the devices. particular, use ensures with QoS requirements can share same spectrum, WPT Back-Com employed to utilize profiles, which avoids dedicated beacon. Furthermore, for WPT-NOMA scheme, application hybrid successive interference cancelation (SIC) decoding order is also considered, analytical results developed demonstrate avoid outage probability error floors realize full diversity gain. Unlike WPT-NOMA, BAC-NOMA suffers from an floor, asymptotic behavior floor analyzed in paper applying extreme value theory. addition, effect BAC-NOMA, i.e., one device's signal as carrier another device, studied, its impact on gain revealed. Simulation provided compare performance strategies verify results.