Design of Rate-Compatible Irregular LDPC Codes for Incremental Redundancy Hybrid ARQ Systems
Jae‐Hong Kim, Woonhaing Hur, Aditya Ramamoorthy, Stephen McLaughlin · 2006
We present a new class of irregular low-density parity-check (LDPC) codes for finite block length (up to a few thousand symbols). The proposed codes are efficiently encodable and have a simple rate-compatible puncturing structure which is suitable for incremental redundancy hybrid automatic repeat request (IR-HARQ) systems. The codes outperform optimized irregular LDPC codes and (extended) irregular repeat-accumulate codes for rates 0.67-0.94, and are particularly good at high puncturing rates where good puncturing performance has been previously difficult to achieve. These characteristics result in good throughput performance over time-varying channels in IR-HARQ systems