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A near optimal BP (NOBP) algorithm for low-density parity-check (LDPC) coded M-ary BICM communication system is proposed in this paper. Due to the good code structure of LDPC code, we derive the NOBP algorithm with the generalized distributive law from the generalized M-ary BP algorithm. The simulation results show that the NOBP algorithm outperforms the traditional BICM-BP algorithm over both the...
Bit-interleaved coded modulation (BICM), which has been proven to be powerful when applied in low-density parity-check (LDPC) sum-product algorithm (SPA) decoder, is a bandwidth efficient coding scheme. However, the BICM-SPA decoder does not take the statistical dependencies between bits from the same L-ary modulated symbol into account so that it cannot converge to the maximum a-posteriori (MAP)...
This paper proposes a class of decomposable LDPC codes based on finite geometry EG(m, ps) over bandlimited AWGN channel. These LDPC codes defined as the origin LDPC codes are decomposed into a few small LDPC codes as component codes in multilevel coding. It is shown that the origin LDPC codes demand generic M-ary Min-Sum algorithm while the component codes only require a few binary Min-Sum algorithm...
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