Memory Efficient Decoder Architectures for Quasi-Cyclic LDPC Codes

In this paper, we first propose parallel turbo-sum-product (PTSP) and turbo-shuffled-sum-product (TSSP) decoding algorithms for partly parallel decoder architectures of quasi-cyclic (QC) low-density parity-check (LDPC) codes. Our proposed algorithms not only achievefasterconvergenceandbettererrorperformancethan the sum-product (SP) decoding algorithm, but also needlessmemoryin implementation. Then we propose a partly parallel decoder architecture based on our PTSP algorithm and implement it using FPGA. Our PTSP decoder architecture achievessignificantlyhigherthroughputand requireslessmemorythan previously proposed decoder architectures with the same FPGA and LDPC code. Finally, to further reduce the memory requirement, we also propose a partly parallel decoder architecture based on our TSSP algorithm.