Successive Interference Cancellation Prototype for BLE and IEEE 802.15.4 in the Physical Layer
Résumé
Bluetooth Low Energy (BLE) and IEEE 802.15.4 are two widely adopted wireless communication protocols in Internet of Things (IoT) applications. Both operate in the 2.4 GHz ISM band, where their coexistence can cause mutual interference. In this demo, we present a proof-of-concept post-processing prototype that recovers colliding packets by employing an effective algorithm based on a coarse-to-fine exhaustive search and cross-correlation for Successive Interference Cancellation (SIC). First, the stronger signal is demodulated, then its reconstructed waveform is subtracted from the captured interfered signal in order to demodulate the weaker signal. This approach allows the demodulation of both protocols despite overlaps in frequency and time. The experimental setup includes three software-defined radios (two transmitters, one per protocol, and one receiver), all connected to the same host computer. This solution is most suitable for gateways, where power consumption and computational resources are less constrained. Its main limitation is that it assumes direct line of sight between transmitters and receiver, so a dominant high-power signal exceeds any multipath reflections. It further requires a sufficiently high SNR to recover the low-power signal after subtraction, and the ADC's quantisation limits the power difference between the two protocols. It demonstrates the potential to increase coexistence throughput in dense IoT deployments.
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