Optimized variable degree matched mapping for protograph LDPC coded modulation with 16QAM

Jin, Yi; Jiang, Ming; Zhao, Chunming

doi:10.1109/istc.2010.5613828

Cited by 22 publications

(21 citation statements)

References 15 publications

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“…Doing this for the case of gray-labeled squared-constellation-based 16-ary DCSK reveals I (x e 0 ; y) = I (x e 1 ; y) and I (x e 2 ; y) = I (x e 3 ; y) with I (x e 1 ; y) > I (x e 3 ; y). The term water-filling refers to the mapping of variable node degrees in proportion to the bit-plane MI, which still performs well because higher-degree nodes can affect more other nodes than lower-degree nodes although it is not optimal [23].…”

Section: A Transmitter 1) Squared-constellation-based M-ary Dcskmentioning

confidence: 99%

“…Firstly, the extrinsic mutual information (MI) of the demodulator is calculated for a fixed E b /N 0 [23], [27]. Initialize the priori MI I …”

Section: P-exit Algorinthmmentioning

confidence: 99%

“…BICM can obtain maximum code-word dispersion degree by combining binary error-control codes and higher-order modulation with a bit-wise interleaving in an appropriate soft-decision bit metric. P-LDPC codes were applied to the BICM system over the Gaussian channel with a mapping scheme called variable degree matched mapping (VDMM) in [22], for which some optimized designs of the scheme were carried out in [23] and [24]. But, very few studies have been performed over multipath fading channels.…”

mentioning

confidence: 99%

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A Differential Chaotic Bit-Interleaved Coded Modulation System Over Multipath Rayleigh Channels

Zhan

Wang

Katz

et al. 2017

IEEE Trans. Commun.

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Abstract-In this paper, a novel differential chaotic bitinterleaved coded modulation (DC-BICM) system is proposed for band-limited transmission. This system combines protographbased low density parity check codes with constellation-based M-ary differential chaos shift keying (DCSK) modulation by one bitwise interleaving. Bit error rate simulation results show that the system has higher coding gain compared with the constellation-based M-ary DCSK modulation system with the same spectral efficiency over multipath Rayleigh fading channels. At the same time, several simulations and P-EXIT analysis are used to analyze the performance of the proposed system. It is found that there is a lot of room for optimization of the system by comparing decoding thresholds and simulation results. Moreover, the system with only partial channel state information has better performance and lower complexity compared with the traditional bit-interleaved coded modulation (BICM) directsequence-spread-spectrum system. As a result, the DC-BICM system is a good candidate for band-limited transmission.Index Terms-Constellation-based M-ary DCSK, BICM, protograph-based LDPC, multipath Rayleigh fading channel, band-limited transmission.

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Section: A Transmitter 1) Squared-constellation-based M-ary Dcskmentioning

confidence: 99%

“…Firstly, the extrinsic mutual information (MI) of the demodulator is calculated for a fixed E b /N 0 [23], [27]. Initialize the priori MI I …”

Section: P-exit Algorinthmmentioning

confidence: 99%

mentioning

confidence: 99%

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A Differential Chaotic Bit-Interleaved Coded Modulation System Over Multipath Rayleigh Channels

Zhan

Wang

Katz

et al. 2017

IEEE Trans. Commun.

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“…Following that idea, Jin et. al [11] carried out an exhaustive search of all possible permutations of protograph variable nodes mappings to symbol bits, and find the optimal mapping pattern for the 16-QAM modulation whose constellation is shown in Figure 5, which gives an iterative decoding threshold improvement of 0.14 dB compared with that of the water-filling approach in [10].…”

Section: A Mapping Algorithmmentioning

confidence: 99%

“…In this paper, we study two families of protograph codes: AR4JA protograph codes [8] and a recently proposed protograph codes [9], and map them to high-order modulations. We should mention that the protograph-based LDPC coded BICM using AR4JA protograph codes with 16QAM in AWGN channel was previously studied in [10], [11]; the advantage of our design process is that it is modular and easy to apply to other protographs and modulations. We propose here a general mapping scheme that maps any protograph structure with any modulation.…”

Section: Introductionmentioning

confidence: 99%

Threshold of Protograph-Based LDPC Coded BICM for Rayleigh Fading

Nguyen¹,

Nosratinia

2011

2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

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Protograph-based bit-interleaved coded modulation (BICM) provides an elegant way of designing coded modulation over Rayleigh faded channels, however, to date the available designs have been limited to specific modulations and the corresponding decoding thresholds have not been known for Rayleigh faded channels. In this work, we present a simple method for designing protograph-based BICM that is general and applies to any modulation, and furthermore we calculate the iterative decoding thresholds of the protograph codes while mapped to higher order modulations. This general coding framework can support not only multiple rates but also adaptive modulation. We report that certain families of protograph codes achieve a threshold within a gap of approximately 0.2 − 0.4 dB of BICM capacity limit across a wide range of rates and modulations.

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