decoded payload
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system architecture
continuous 2d optical wave stream carrier with 1d neural demodulation and galois field reed-solomon forward error correction.
end-to-end signal pipeline
scheme16-apsk continuous
codecrs(48, 40) gf-256
max payload39 bytes
parity budget8 bytes (16.7%)
symbol grid8 lines × 12 sym
symbol length24 px / symbol
carrier window360×360 px square
inference epwebgpu / wasm
1. transmitter pipeline
utf-8 payload is padded and encoded through an rs(48,40) codec. the resulting 384-bit stream is mapped into 96 16-apsk symbols where each 4-bit block determines discrete amplitude and phase.
2. receiver pipeline
sub-pixel weighted centroid slicing tracks wave nominal centers with sub-pixel resolution. normalized 24-point segments are classified via onnx runtime web into symbols and reconstructed into text.
error correction
constructed over gf(256) using irreducible polynomial p(x) = x^8 + x^4 + x^3 + x^2 + 1 (0x11d). with 8 parity bytes, berlekamp-massey and forney algorithms guarantee exact recovery from up to 4 corrupted bytes (8 whole symbols).
3. centroid + 1d cnn advantage
replaces fragile binary pixel thresholding with continuous sub-pixel energy localization and deep convolutional classification.
weighted centroid
sub-pixel skeleton tracking; invariant to stroke width, antialiasing bleed, and color contrast.
1d cnn classifier
resilient to optical distortion, lens curvature, perspective skew, and harmonic noise.