Abstract: The parallel concatenated gallager code (PCGC), a new kind of channel code which concatenates the low density parity check (LDPC) code in parallel, can be decoded in the two-layer iterative style.The PCGC decoder has good performance, but its high computation complexity interferes with its hardware implement.In this paper two kinds of low complexity PCGC iterative decoding algorithms, and the simulation results prove that the algorithms have excellent performance are proposed.

Key words: PCGC, LDPC code, belief propagation algorithm, iterative decoding