Analysis of nonlinear companding schemes for papr reduction of SC-FDMA signals

Sun, Enchang; Sun, Yanhua; Si, Pengbo; Zhang, Yanhua

doi:10.1109/gmc.2011.6103936

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…The SUSpathway also does not explain why triose-phosphate translocator (tpt) mutants, which are unable to export triose-phosphates for sucrose biosynthesis, accumulate more starch than WT plants in the light (Schneider et al, 2002). Likewise, mutants defective in the pathway of sucrose synthesis (Strand et al, 2000;Sun et al 2011;Malinova et al, 2014) usually have elevated starch. If ADPG were synthesized primarily from sucrose via SUS, all of these mutants would be expected to have less starch than WT.…”

Section: Introductionmentioning

confidence: 99%

The pathway of starch synthesis inArabidopsis thalianaleaves

Fünfgeld

Wang

Ishihara

et al. 2021

Preprint

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Many plants accumulate transitory starch reserves in their leaves during the day to buffer their carbohydrate supply against fluctuating light conditions, and to provide carbon and energy for survival at night. It is universally accepted that transitory starch is synthesized from ADP-glucose (ADPG) in the chloroplasts. However, the consensus that ADPG is made in the chloroplasts by ADPG pyrophosphorylase has been challenged by a controversial proposal that ADPG is made primarily in the cytosol, probably by sucrose synthase (SUS), and then imported into the chloroplasts. To resolve this long-standing controversy, we critically re-examined the experimental evidence that appears to conflict with the consensus pathway. We show that when precautions are taken to avoid artefactual changes during leaf sampling, Arabidopsis thaliana mutants that lack SUS activity in mesophyll cells (quadruple sus1234) or have no SUS activity (sextuple sus123456) have wild-type levels of ADPG and starch, while ADPG is 20 times lower in the pgm and adg1 mutants that are blocked in the classical pathway of starch synthesis. We conclude that the ADPG needed for starch synthesis in leaves is synthesized primarily by ADPG pyrophosphorylase in the chloroplasts.Significance statementMutant analysis shows that sucrose synthase makes no significant contribution to transitory starch synthesis in Arabidopsis leaves, resolving a 20-year old controversy about one of the most important pathways of photosynthetic metabolism.

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Section: Introductionmentioning

confidence: 99%

The pathway of starch synthesis inArabidopsis thalianaleaves

Fünfgeld

Wang

Ishihara

et al. 2021

Preprint

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“…The larger linear range gives more costly PA. In order to solve such problem of high PAPR in OFDM system many PAPR reduction methods are being used over several years as a separate method or in hybrid combination of methods, such as PTS Technique [2],SLM Technique [3],clipping [4], block coding [5], tone reservation [6], companding transform [1], [7][8][9][10][11], Hadamard transform [12]. The simplest technique out of above is clipping but it causes not only out-of-band radiation (OBR) but also in-band distortion (IBD).…”

Section: Introductionmentioning

confidence: 99%

Performance Enhancement of Wireless Link using Optimized Two Piecewise Companding by PAPR Reduction

Patel¹

2018

IJRASET

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I. INTRODUCTIONNow a days mobile communication has become very active and super wide area for research for scientist and engineers. The initial purpose of the technology was to use it for voice telephony, but later on its implementation is used for services like video, data, text and images while moving even at high speed like hundreds of kmph with air as a channel. OFDM also has some draw backs like high PAPR, frequency offset between transmitter & receiver and synchronization between transmitter and receiver etc. It suffers from huge envelope fluctuation, which produces high peak-to-average power ratio (PAPR) in Power Amplifier (PA) at the side of digital-to-analog (D/A) converter in transmitter and it can also be problematic at analog-to-digital (A/D) conversion side at the receiver end. The worst-case signal peaks, which are comparatively very high compare to normal peaks. The high value of PAPR needs a very wide linear range of the PA to combat a nonlinear distortion which can occur when signal goes up to the non linear region of in the input and output relationship of PA. The cost of HPA is based on the linear range of PA. The larger linear range gives more costly PA. In order to solve such problem of high PAPR in OFDM system many PAPR reduction methods are being used over several years as a separate method or in hybrid combination of methods, such as PTS [12]. The simplest technique out of above is clipping but it causes not only out-of-band radiation (OBR) but also in-band distortion (IBD). Companding transform is also a very simple method, which processes the OFDM signals directly. This makes the process very fast and relatively easy.

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New error function companding technique to minimize PAPR in LTE uplink communications

Ramtej

Anuradha

2017

2017 Twenty-Third National Conference on Communications (NCC)

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Analysis of nonlinear companding schemes for papr reduction of SC-FDMA signals

Cited by 4 publications

References 8 publications

The pathway of starch synthesis inArabidopsis thalianaleaves

The pathway of starch synthesis inArabidopsis thalianaleaves

Performance Enhancement of Wireless Link using Optimized Two Piecewise Companding by PAPR Reduction

New error function companding technique to minimize PAPR in LTE uplink communications

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