In this paper, we present an advanced coherent receiver for the IEEE 802.15.4 offset-quadrature-phase-shift-keying (OQPSK) physical layer and provide an open-source implementation in the GNU Radio framework. Simulation and field test results show that the proposed receiver achieves about 11 dB power gain over an existing GNU Radio receiver, which treats OQPSK as minimum-shift-keying (MSK) for low-complexity processing. While suitable modules can be added to the MSK-based receiver for performance enhancement, the proposed receiver still maintains a 6 dB power gain. The proposed coherent receiver is attractive for IoT applications where a powerful software-defined-radio (SDR) based gateway is deployed to interact with various sensors.
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Copyright 2021 Elsevier B.V., All rights reserved.
- IEEE 802.15 Standard
- IEEE 802.15.4
- Logic gates
- Physical layer
- Wireless communication
- Wireless sensor networks