LoRa Superposition in Practice: Measurements, SIC, Power-Offset Negotiation, Single-Header Payload

LoRa Superposition in Practice: Measurements, SIC, Power-Offset Negotiation, Single-Header Payload

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We present a measurement-to-design workflow to raise single-link LoRa (Long Range) throughput via planned twostream superposition of spreading factors (SFs). On a commercial SX1301-class gateway, we map feasible regions versus the interstream power offset (∆P) and report SNR/RSSI (signal-tonoise ratio / received signal strength indicator) margins and SIC pre/post (successive interference cancellation before/after) improvements, instead of packet error rate. Across practical SF pairs at 125 kHz bandwidth, the balancing offset is typically 2.5–10.5 dB. With time-aligned payloads, the slower branch adds ≈ 7–52 % atop the base SF at equal time-on-air (ToA, time on air). To probe robustness beyond AWGN (additive white Gaussian noise), we stress the higher-SF branch with a narrowband interferer and model asymmetric cross-SF leakage with reduced SIC, observing ∆Popt drift with channel quality; this motivates lightweight, server-driven ∆P negotiation conveyed in application downlinks. Finally, we propose single-header superposition: only the fast SF sends preamble+header; both payloads run concurrently, removing the second preamble and header and improving airtime, while optional SIC further increases margins.

We present a measurement-to-design workflow to raise single-link LoRa (Long Range) throughput via planned twostream superposition of spreading factors (SFs). On a commercial SX1301-class gateway, we map feasible regions versus the interstream power offset (∆P) and report SNR/RSSI (signal-tonoise ratio / received signal strength indicator) margins and SIC pre/post (successive interference cancellation before/after) improvements, instead of packet error rate. Across practical SF pairs at 125 kHz bandwidth, the balancing offset is typically 2.5–10.5 dB. With time-aligned payloads, the slower branch adds ≈ 7–52 % atop the base SF at equal time-on-air (ToA, time on air). To probe robustness beyond AWGN (additive white Gaussian noise), we stress the higher-SF branch with a narrowband interferer and model asymmetric cross-SF leakage with reduced SIC, observing ∆Popt drift with channel quality; this motivates lightweight, server-driven ∆P negotiation conveyed in application downlinks. Finally, we propose single-header superposition: only the fast SF sends preamble+header; both payloads run concurrently, removing the second preamble and header and improving airtime, while optional SIC further increases margins.

Delta-P negotiation, LoRa, NOMA, power offset, SIC, superposition, ToA reduction

Delta-P negotiation, LoRa, NOMA, power offset, SIC, superposition, ToA reduction

POSPÍŠIL, J.; MARTINÁSEK, Z.; FUJDIAK, R.; TÁBORSKÝ, V.

2026

04.11.2025

979-8-3315-7675-2

2025 17th International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT)

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