Welcome to pyldpc documentation

version 0.7.7


  • Simulation of regular LDPC codes.

  • Probabilistic decoding: Belief Propagation algorithm for gaussian white noise transmission.

  • Simulation application to image and audio data.

Image coding-decoding example:

https://media.giphy.com/media/l4KicsAauqIWjeFR6/giphy.gif https://media.giphy.com/media/l0COHC49bK6g7yIPm/giphy.gif

Sound coding-decoding example:


If you already have a working Python environment (Anaconda for e.g):

pip install --upgrade pyldpc

Otherwise, we recommend creating this minimal conda env

conda env create --file environment.yml
conda activate pyldpc-env
pip install -U pyldpc


>>> import numpy as np
>>> from pyldpc import make_ldpc, encode, decode, get_message
>>> n = 15
>>> d_v = 4
>>> d_c = 5
>>> snr = 10
>>> H, G = make_ldpc(n, d_v, d_c, systematic=True, sparse=True)
>>> k = G.shape[1]
>>> v = np.random.randint(2, size=k)
>>> y = encode(G, v, snr)
>>> d = decode(H, y, snr, maxiter=100, log=True)
>>> x = get_message(G, d)
>>> assert abs(x - v).sum() == 0


Please contact hicham.janati@inria.fr for any bug encountered / any further information.


All dependencies are in ./environment.yml


A set of examples: User Guide.