Efficient multiple access is vital for spectrum-constrained, user-dense IoT networks. This study joins interleave-division multiple access (IDMA) with power-domain non-orthogonal multiple access (NOMA) and employs ordered successive-interference-cancellation multi-user detection (SIC-MUD). Unequal power allocation and orthogonal interleavers let all users share one spreading code while keeping chip-level complexity low. Simulations of a five-user uplink and a thirty-two-user downlink show that the worst user attains a bit-error rate of 1.4 × 10⁻³ at 10 dB, needing ≈ 3 dB less SNR than equal-power IDMA; flat Rayleigh fading raises the curve by only ≈ 2 dB. A software detector processes 2048-bit frames in ≈ 0.03 s on a standard desktop, and cycle estimates predict under 5 ms latency on a 32-100 MHz FPGA. Random interleaving gives the lowest error rate, while master-random and tree-based patterns lose < 0.3 dB yet cut memory sharply. Ordered SIC-MUD NOMA-IDMA thus offers concrete performance gains and real-time feasibility for dense 6G and massive-IoT deployments.
Non-Orthogonal Multiple Access (NOMA) Interleave-Division Multiple Access (IDMA) Successive Interference Cancellation (SIC) Multi-User Detection (MUD) Spectrum Efficiency
Efficient multiple access is vital for spectrum-constrained, user-dense IoT networks. This study joins interleave-division multiple access (IDMA) with power-domain non-orthogonal multiple access (NOMA) and employs ordered successive-interference-cancellation multi-user detection (SIC-MUD). Unequal power allocation and orthogonal interleavers let all users share one spreading code while keeping chip-level complexity low. Simulations of a five-user uplink and a thirty-two-user downlink show that the worst user attains a bit-error rate of 1.4 × 10⁻³ at 10 dB, needing ≈ 3 dB less SNR than equal-power IDMA; flat Rayleigh fading raises the curve by only ≈ 2 dB. A software detector processes 2048-bit frames in ≈ 0.03 s on a standard desktop, and cycle estimates predict under 5 ms latency on a 32-100 MHz FPGA. Random interleaving gives the lowest error rate, while master-random and tree-based patterns lose < 0.3 dB yet cut memory sharply. Ordered SIC-MUD NOMA-IDMA thus offers concrete performance gains and real-time feasibility for dense 6G and massive-IoT deployments.
Non-Orthogonal Multiple Access (NOMA) Interleave-Division Multiple Access (IDMA) Successive Interference Cancellation (SIC) Multi-User Detection (MUD) Spectrum Efficiency
This study was conducted in accordance with scientific and ethical principles, and all referenced works are properly cited in the bibliography.
| Primary Language | English |
|---|---|
| Subjects | Software Engineering (Other) |
| Journal Section | Research Article |
| Authors | |
| Submission Date | March 5, 2025 |
| Acceptance Date | August 9, 2025 |
| Early Pub Date | September 26, 2025 |
| Publication Date | September 30, 2025 |
| DOI | https://doi.org/10.35377/saucis...1650707 |
| IZ | https://izlik.org/JA57DS92EZ |
| Published in Issue | Year 2025 Volume: 8 Issue: 3 |
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