Hybrid Multi-Dimensional Modulation for Gaussian and Fading Channels

Wong, Tze C.; Kwon, Hyuck M.; Mukherjee, Amitav

doi:10.1109/vetecf.2010.5594209

Cited by 9 publications

(7 citation statements)

References 11 publications

(14 reference statements)

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“…In [48], the spherical codes are proposed for SCMA systems that are based on the constellations in [84], [85]. It was later shown in [47] by similar authors that M-Bao in [47] outperforms the spherical codes in [48].…”

Section: ) M-baomentioning

confidence: 99%

Multidimensional Constellations for Uplink SCMA Systems—A Comparative Study

Vameghestahbanati

Marsland

Gohary

et al. 2019

IEEE Commun. Surv. Tutorials

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Sparse code multiple access (SCMA) is a class of non-orthogonal multiple access (NOMA) that is proposed to support uplink machine-type communication services. In an SCMA system, designing multidimensional constellation plays an important role in the performance of the system. Since the behavior of multidimensional constellations highly depends on the type of the channel, it is crucial to employ a constellation that is suitable for a certain application. In this paper, we first highlight and review the key performance indicators (KPIs) of multidimensional constellations that should be considered in their design process for various channel scenarios. We then provide a survey on the known multidimensional constellations in the context of SCMA systems with their design criteria. The performance of some of those constellations are evaluated for uncoded, high-rate, and low-rate LTE turbo-coded SCMA systems under different channel conditions through extensive simulations. All turbo-coded comparisons are performed for bit-interleaved coded modulation, with a concatenated detection and decoding scheme. Simulation results confirm that multidimensional constellations that satisfy KPIs of a certain channel scenario outperform others. Moreover, the bit error rate performance of uncoded systems, and the performance of the coded systems are coupled to their bit-labeling. The performance of the systems also remarkably depends on the behavior of the multi-user detector at different signal-to-noise ratio regions.Index Terms-Non-orthogonal multiple access (NOMA), Sparse code multiple access (SCMA), low density spreading (LDS), multidimensional constellation, SCMA codebook, fading channels, message passing algorithm (MPA), bit-interleaved coded modulation (BICM), key performance indicators (KPIs).

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Section: ) M-baomentioning

confidence: 99%

Multidimensional Constellations for Uplink SCMA Systems—A Comparative Study

Vameghestahbanati

Marsland

Gohary

et al. 2019

IEEE Commun. Surv. Tutorials

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“…We now describe the MDM design philosophy as first detailed in [10]. In order to maximize the minimum distance of each symbol, M symbols need to be positioned in ‫ܯ‬ െ 1 dimensions.…”

Section: B Mdm Constellation Designmentioning

confidence: 99%

“…Although further simplification (approximation) is possible by introducing hyper geometric functions, we numerically evaluate (10) to compute the exact MDM SER.…”

Section: A Single Path With Coherent Detectionmentioning

confidence: 99%

“…An exact symbol error probability calculation for arbitrary three-dimensional constellations was examined in [7]. Related works on multi-dimensional modulation include [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

“…In this work, in Section I we briefly recapitulate the MDM signaling strategy originally proposed by the authors in [10] for Gaussian channels. We then conduct a performance analysis for the exact symbol and bit error probabilities of the proposed signaling sets up to an arbitrary constellation size in Section III, which includes the results of [7] as a special case.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multi-dimensional modulation for multi-path fading channels: Performance analysis

Wong

Kwon

2010

2010 - Milcom 2010 Military Communications Conference

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This paper proposes a multi-dimensional modulation (MDM) technique that achieves better performance than conventional orthogonal modulation without any diversity or coding gain. The key to improving upon the performance of orthogonal modulation is to efficiently exploit the additional degrees of freedom offered by higher dimensional Euclidean space in the constellation design. Analytical results are obtained for the exact symbol and bit error performance of the MDM design over flat and multipath Rayleigh fading channels. Through simulation, we compare the error performance of the MDM scheme with conventional orthogonal modulation, namely frequency-shift keying.

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