Rate-Compatible Joint Source-Channel Coding Scheme Based on 5GNR LDPC Codes
Hao Dong, Kai Niu, Bichai Wang, Jue Chen · 2023
In this paper, we propose a simple source coding matrix construction method. At first, the entropy rate H of the source is evaluated. The source coding rate Rsis determined by the height-to-width ratio of the source coding matrix. Therefore, the base matrix B1of 5GNR is transposed and cropped to the needed size, and the source coding base matrix Bsis generated. Finally, the source coding base matrix is transformed into the purpose-sized source coding matrix Hsvia the Lifting operation. In addition, this paper proposes a method to optimize the decoding threshold. Replacing the unit matrix in the joint parity-check matrix with the permutation matrix can reduce the decoding threshold. The proposed method in this paper is easy to integrate into existing 5GNR coding systems and can accommodate many different code length-code rate combinations just like the LDPC codes of 5GNR. In terms of complexity, the construction process is relatively simple and can share parameters with the 5GNR LDPC codes to avoid the storage space overhead of storing an additional set of coding matrices.