On Concatenated Zigzag Codes and Their Decoding Schemes
Xiaofu Wu, Y. Xue, Haige Xiang · IEEE Communications Letters · 2004
In this letter, we show that a concatenated zigzag code can be viewed as a low-density parity-check (LDPC) code. Based on the bipartite graph representation for such a parallel-concatenated code, various sum-product based decoding algorithms are introduced and compared. The results show that the improved versions of sum-product algorithm exhibit better convergence rate while maintaining the essential parallel form.