Performance Analysis of an Advanced HARQ Scheme Based on LDPC Coupled Codes

In this paper, we investigate the effectiveness of a newly proposed frame superposition Hybrid Automatic Repeat reQuest (HARQ) scheme, which adopts different variants of spatially coupled low-density parity-check (LDPC) codes. The construction of the method with the use of 5 G new radio (NR) LDPC codes is explained in detail. Bit error rate (BER), frame error rate (FER), and the projected data goodput in additive white Gaussian noise (AWGN) and Rayleigh block fading channels are investigated. The HARQ scheme is based on frame combination by using spatially coupled LDPC codes. It outperforms all classical variants of HARQ and can, hence, be seen as a potential successor of the classical methods. The main cost is the need for more complicated LDPC decoding, whereby the decoder needs to support the decoding of two or even more blocks at the same time.