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This paper describes the design and C99 implementation of a free andopen-source Low-Density Parity-Check (LDPC) codes encoder and decoder focusedprimarily on the Quasi-Cyclic LDPC (QCLDPC) codes utilized in the IEEE802.11ax-2021 (Wi-Fi 6) and IEEE 802.16-2017 (WiMAX) standards. The encoder isdesigned in two variants: the first one universal, the other a minimal memoryusage design. The decoder provides a single- and multi- threaded implementationof the layered singlescan min-sum LDPC decoding algorithm both for floatingpoint and fixed-point arithmetic. Both encoder and decoder are directlycallable from MATLAB using the provided MEX wrappers but are designed to besimply used in any C project. A comparison of throughput and error performancewith the recent commercial closed-source MEX implementation of an LDPC encoderand decoder introduced in MATLAB R2021b Communications Toolbox is provided.Source code portability to alternative nonx86 architectures is facilitated byusing only the standard C99 constructs, GNU tools, and POSIX libraries. Theimplementation maintains low-memory requirements, enabling its deployment in aconstrained-architecture in the context of Internet of Things. All source codesare freely available on GitHub under a permissive BSD license.

High Throughput Open-Source Implementation of Wi-Fi 6 and WiMAX LDPC Encoder and Decoder