High Order APSK Constellation Design For Next Generation Satellite Communication

Kayhan, Farbod

doi:10.2514/6.2016-5735

Cited by 6 publications

(3 citation statements)

References 12 publications

(5 reference statements)

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“…standard [1]. We kindly refer the readers to [19] and [20] for more details on the performance of QCI constellations.…”

Section: Introductionmentioning

confidence: 99%

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On Low Complexity Detection for QAM Isomorphic Constellations

Kayhan

2017

GLOBECOM 2017 - 2017 IEEE Global Communications Conference

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Despite of the known gap from the Shannon's capacity, several standards are still employing QAM or star shape constellations, mainly due to the existing low complexity detectors. In this paper, we investigate the low complexity detection for a family of QAM isomorphic constellations. These constellations are known to perform very close to the peak-power limited capacity, outperforming the DVB-S2X standard constellations. The proposed strategy is to first remap the received signals to the QAM constellation using the existing isomorphism and then break the log likelihood ratio computations to two one dimensional PAM constellations. Gains larger than 0.6 dB with respect to QAM can be obtained over the peak power limited channels without any increase in detection complexity. Our scheme also provides a systematic way to design constellations with low complexity one dimensional detectors. Several open problems are discussed at the end of the paper. Index Termsnon-uniform APSK constellations, high order modulations, soft demapping, detection complexity I. INTRODUCTIONHigh order constellations with up to 256 signals have been adopted in new satellite communication standards such as digital video broadcasting (DVB-S2X) [1], in view of the growing demand for spectral efficiency. Given the fact that the traffic demand for satellite broadband is expected to grow six-fold by 2020 [2], and the continuous need for higher data rates in satellite communications, even larger constellations may be needed in near future.The receiver's computational complexity is one of the main concerns in any high throughput communication systems. On one hand, to increase the spectral efficiency one needs to employ high order constellations. On the other hand, the detection computational complexity grows as a function of constellation size and dimension. Indeed, despite the known gap from the Shannon capacity, quadrature amplitude modulation (QAM) constellations are still widely used in some standards (see for example [3]) due to the existing low complexity and simple detector. In this paper, we focus on bit-interleaved coding and modulation (BICM) scheme [4]. In such systems, the log-likelihood ratio (LLR) computations are the receiver's computational bottleneck, specially for large constellations.

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“…standard [1]. We kindly refer the readers to [19] and [20] for more details on the performance of QCI constellations.…”

Section: Introductionmentioning

confidence: 99%

“…These constellations have a non-uniform APSK shape and they perform better than the optimized APSK constellations in DVB-S2X standard [1]. We kindly refer the readers to [19] and [20] for more details on the performance of QCI constellations.…”

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confidence: 99%

On Low Complexity Detection for QAM Isomorphic Constellations

Kayhan

2017

GLOBECOM 2017 - 2017 IEEE Global Communications Conference

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“…The MODCODs over non-linear and fading channels are related to the base set through a transformation applied on the constellations. In particular, we use the radial mapping over the non-linear channel, 7,8 and the constellation rotation over the fading channel.…”

Section: Introductionmentioning

confidence: 99%

Unified Satellite and Terrestrial ACM Design

Haqiqatnejad

Kayhan

2017

35th AIAA International Communications Satellite Systems Conference

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First step towards integrating satellite and terrestrial standards at the physical layer is to design a unified packet frame structure, and in particular, a unified adaptive coding and modulation (ACM) scheme without substantial loss in either of the systems. In this paper we introduce a methodology to design such a set of modulation and coding (MODCOD) combinations. In the first step, we design a set of base MODCODs for the AWGN channel. Then, for any other given channel model, we build a new set of MODCODs through a suitable transformation of the base MODCODs. We mainly focus on two types of channels: (a) non-linear satellite channels, and (b) AWGN channels with fading. We compare our results with latest digital video broadcasting standards, namely, DVB-T2 and DVB-S2X. Nomenclature

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LEO constellation design for regional coverage based on the safety of van allen belt radiation

Kohani

Zong

2018

Journal of Space Safety Engineering

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High Order APSK Constellation Design For Next Generation Satellite Communication

Cited by 6 publications

References 12 publications

On Low Complexity Detection for QAM Isomorphic Constellations

On Low Complexity Detection for QAM Isomorphic Constellations

Unified Satellite and Terrestrial ACM Design

LEO constellation design for regional coverage based on the safety of van allen belt radiation

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