Low-complexity LDPC coded BICM-ID with orthogonal modulations

Che, Shilling; Tong, Sheng

doi:10.1049/el.2009.0521

Cited by 13 publications

(3 citation statements)

References 8 publications

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“…LDPC-aided BICM-ID [23] and irregular convolutional code-aided BICM-ID [16] belong to this category. This is the reason why call EBSA "framework" rather than "technique".…”

Section: Fukawamentioning

confidence: 99%

EXIT-constrained BICM-ID design using extended mapping

Fukawa

Ormsub

Tölli

et al. 2012

J Wireless Com Network

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This article proposes a novel design framework, EXIT-constrained binary switching algorithm (EBSA), for achieving near Shannon limit performance with single parity check and irregular repetition coded bit interleaved coded modulation and iterative detection with extended mapping (SI-BICM-ID-EM). EBSA is composed of node degree allocation optimization using linear programming (LP) and labeling optimization based on adaptive binary switching algorithm jointly. This technique achieves exact matching between the Demapper (Dem) and decoder's extrinsic information transfer (EXIT) curves while the convergence tunnel opens until the desired mutual information (MI) point. Moreover, this article proposes a combined use of SI-BICM-ID-EM with Doped-ACCumulator (D-ACC) and modulation doping (MD) to further improve the performance. In fact, the use of D-ACC and SI-BICM-ID (noted as DSI-BICM-ID-EM) enables the right-most point of the EXIT curve of the combined demapper and D-ACC decoder (D dacc ), denoted as DemD dacc , to reach a point very close to the (1.0, 1.0) MI point. Furthermore, MD provides us with additional degree-of-freedom in "bending" the shape of the demapper EXIT curve by choosing the mixing ratio of modulation formats, and hence the left most point of the demapper EXIT curve can flexibly be lifted up/pushed down with MD aided DSI-BICM-ID-EM (referred to as MDSI-BICM-ID-EM). Results of the simulations show that near-Shannon limit performance can be achieved with the proposed technique; with a parameter set obtained by EBSA for MDSI-BICM-ID-EM, the threshold signal-to-noise power ratio (SNR) is only roughly 0.5 dB away from the Shannon limit, for which the required computational complexity per iteration is at the same order as a Turbo code with only memory-2 convolutional constituent codes.

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“…LDPC-aided BICM-ID [23] and irregular convolutional code-aided BICM-ID [16] belong to this category. This is the reason why call EBSA "framework" rather than "technique".…”

Section: Fukawamentioning

confidence: 99%

EXIT-constrained BICM-ID design using extended mapping

Fukawa

Ormsub

Tölli

et al. 2012

J Wireless Com Network

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“…However, though CSK acquisition complexity has been subject to previous works as in [7], to the best of our knowledge, CSK demodulation strategies and their computational cost have been only partly and scarcely discussed, with some results and proposals mainly disseminated in [5], [8], [9]. Also, while low complexity iterative LDPC decoding has been extensively studied in the literature, efficient low-complexity iterative demapping for the CSK modulation, or more generally for orthogonal modulations [10], [11] has been less discussed.…”

Section: Introductionmentioning

confidence: 99%

On Efficient and Low-Complexity Decoding of Binary LDPC-Coded CSK Signals for GNSS Links with Increased Data Rates

Chauvat

Garcia-Pena

Paonni

2020

2020 IEEE/ION Position, Location and Navigation Symposium (PLANS)

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GNSS with high data rate links are of interest to accommodate new needs and applications (e.g. precise positioning, authentication, reduction of TTFFD). In this context, a binary LDPC-coded CSK signal is an attractive candidate to increase data rates with a high data recovery robustness. However, such a proposal requires an increase of receiver's computational complexity with respect to receivers for current coded DSSS/BPSK GNSS links. The computational complexity required for data recovery is analysed in this article and insights on crucial technical choices are given for the reception of binary LDPC-coded CSK signals. CSK demodulation is shown to dominate the overall computational cost and the use of digital chip-matched filtering prior to demodulation is proposed to reduce this cost. In addition, iterative demapping, which is crucial to optimize the power efficiency of binary LDPC-coded CSK links is also shown to have high computational complexity. Therefore, low-complexity iterative demapping strategies are studied and simple yet efficient solutions are proposed.

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“…Without loss of generality, we only consider the real part in this paper. LDPC coded modulation for QAM is transferred to the PAM modulation [8][9].…”

Section: Introductionmentioning

confidence: 99%

Superimposed LDPC coded modulation: Construction and optimization

Bie

2012

2012 IEEE 11th International Conference on Signal Processing

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Ahstract-A superimposed Low-density parity-check (LDPC) coded modulation scheme is proposed in this paper, including the mapping rule, the node-by-node demapping algorithm. A bit-level power allocation method is used to achieve the shaping gain on the criterion that the mutual information between channel inputs and outputs is maximized. An optimization method based on Gaussian approximation is introduced to search the degree distributions of the employed LDPC codes. Simulation results show that a low bit-error rate is achieved within only 1.5 dB from the Shannon capacity of 4PAM with a code length 4000 at spectral efficiency 1bit/s/Hz.

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Low-complexity LDPC coded BICM-ID with orthogonal modulations

Cited by 13 publications

References 8 publications

EXIT-constrained BICM-ID design using extended mapping

EXIT-constrained BICM-ID design using extended mapping

On Efficient and Low-Complexity Decoding of Binary LDPC-Coded CSK Signals for GNSS Links with Increased Data Rates

Superimposed LDPC coded modulation: Construction and optimization

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