Fix encoder and decoder - working LDPC simulation

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- Fixed cyclic shift convention (QC-LDPC P_s is left shift, not right)
- Fixed encoder to solve rows sequentially (row 0 first for p1, then 1-6)
- Fixed decoder to only gather connected columns per CN (staircase has dc=2-3)
- Fixed LLR sign convention: positive = bit 0 more likely
- Decoder validates at lam_s >= 4 photons/slot (~90% frame success)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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cah

2026-02-23 21:56:15 -07:00

parent b93a6f5769

commit b7b76da46e

2 changed files with 85 additions and 66 deletions

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