FA-72152 / Error-correcting codes / Member archive

Depuncturing indexes the pattern by received count · case 02

Soft values are placed at shifted positions after the first punctured bit.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Depuncture a rate-matched soft stream: the mother-code stream of length total was punctured with a cyclic 0/1 pattern starting at pattern phase 0 for every block. Reinsert LLR 0 at punctured positions and place received values at kept positions. If the number of received values differs from the number of kept positions, or the pattern keeps nothing, return None. Return the depunctured list.

Why this case matters

Rate-compatible punctured convolutional and turbo codes need exact depuncturing before decoding.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression [[-1, 4, 1, -5, -3], [1, 0, 1, 1, 1, 0], 8]	`[-1, 0, 0, 0, 0, 0, 0, 0]`	`[-1, 0, 4, 1, -5, 0, -3, 0]`	Failed

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