2021/05/28 by Asit Kumar Pradhan, Vamsi K. Amalladinne, Pradhan, Asit Kumar +5 · 1 citation
Computer Science · Engineering · #Cooperative Communication and Network Coding #Advanced Wireless Communication Techniques #Error Correcting Code Techniques
paper · pdf · doi:10.48550/arxiv.2105.13985
This article presents a novel enhancement to the random spreading based\ncoding scheme developed by Pradhan et al. for the unsourced multiple access\nchannel. The original coding scheme features a polar outer code in conjunction\nwith a successive cancellation list decoder (SCLD) and a hard-input soft-output\nMMSE estimator. In contrast, the proposed scheme employs a soft-input\nsoft-output MMSE estimator for multi-user detection. This is accomplished by\nreplacing the SCLD based polar code with an LDPC code amenable to belief\npropagation decoding. This novel framework is leveraged to successfully pass\npertinent soft information between the MMSE estimator and the outer code. LDPC\ncodes are carefully designed using density evolution techniques to match the\niterative process. This enhanced architecture exhibits significant performance\nimprovements and represents the state-of-the-art over a wide range of system\nparameters.\n