Bilayer expurgated LDPC codes with uncoded relaying

• Main Authors: Noor-A-Rahim, Md., Zhang, Nan, Rabiul Islam, Sk. Md., Guan, Yong Liang
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2018
• Subjects: LDPC Codes; DRNTU::Engineering::Electrical and electronic engineering; Bilayer Codes
• Online Access: https://hdl.handle.net/10356/89158; http://hdl.handle.net/10220/46125
• Institution: Nanyang Technological University

Bilayer low-density parity-check (LDPC) codes are an effective coding technique for decode-and-forward relaying, where the relay forwards extra parity bits to help the destination to decode the source bits correctly. In the existing bilayer coding scheme, these parity bits are protected by an error correcting code and assumed reliably available at the receiver. We propose an uncoded relaying scheme, where the extra parity bits are forwarded to the destination without any protection. Through density evolution analysis and simulation results, we show that our proposed scheme achieves better performance in terms of bit erasure probability than the existing relaying scheme. In addition, our proposed scheme results in lower complexity at the relay.