Search results for: Jiantao Xue

Items from 1 to 20 out of 21 results

chapter

An MDL-MUSIC joint time delay estimation method for LTE PRS

Yuan Gao, Jiantao Xue, Yongyu Chang, Yu Zhang

2017 International Symposium on Wireless Communication Systems (ISWCS) > 84 - 89

2017 International Symposium on Wireless Communication Systems (ISWCS)

The downlink positioning method specified by 3GPP is a part of LTE location service. The method utilizes the time difference of Positioning Reference Signal (PRS) for ranging, therefore time delay estimation of PRS is a fundamental question in the method. A conventional algorithm relies on time correlation however faces challenges in multipath channel. For OFDM signal, Multiple Signal Classification...

chapter

Analysis of Localization Using Multipath Characteristics as Location Fingerprint

Yuan Gao, Yongyu Chang, Bin Su, Jiantao Xue, more

2017 IEEE Wireless Communications and Networking Conference (WCNC) > 1 - 5

2017 IEEE Wireless Communications and Networking Conference (WCNC)

In wireless network, localization using location fingerprint is promising. This technique generally utilizes location characteristics based on received signal strength. In this paper, we propose a novel location fingerprint using location characteristics in multipath propagation and a corresponding model. From the model, a localization algorithm is derived. Further, we analyze the Cramer-Rao bound...

article

Effects of early diagenesis on molecular distributions and carbon isotopic compositions of leaf wax long chain biomarker n-alkanes: Comparison of two one-year-long burial experiments

Rencheng Li, Jun Fan, Jiantao Xue, Philip A. Meyers

Organic Geochemistry > 2017 > 104 > C > 8-18

Two burial experiments were performed to compare and contrast the effects of degradation and early diagenesis on the molecular distributions and compound specific carbon isotope compositions of leaf wax n-alkanes under different conditions. Leaves of the bamboo Neosinocalamus affinis and the shrub Osmanthus fragrans were packaged in perforated aluminum packets and buried in soil at two different subtropical...

article

Fidelity of plant-wax molecular and carbon isotope ratios in a Holocene paleosol sequence from the Chinese Loess Plateau

Jiantao Xue, Xinyue Dang, Changyan Tang, Huan Yang, more

Organic Geochemistry > 2016 > 101 > C > 176-183

Loess-paleosol sequences from the Chinese Loess Plateau (CLP) provide important archives for paleoclimate reconstruction in the Quaternary. Lipid biomarkers from the CLP have been shown to be useful as molecular paleoclimate proxies. Here, we report a Holocene record of n-alkane ratios and compound specific carbon isotope compositions from the Weinan section on the southern margin of the CLP. Throughout...

article

Monthly changes in chain length distributions and stable carbon isotope composition of leaf n-alkanes during growth of the bamboo Dendrocalamus ronganensis and the grass Setaria viridis

Rencheng Li, Philip A. Meyers, Jun Fan, Jiantao Xue

Organic Geochemistry > 2016 > 101 > C > 72-81

The links between growth condition change, molecular distributions and δ¹³C values of individual n-alkanes from leaves of the C₃ bamboo Dendrocalamus ronganensis Q.H. Dai and D.Y. Huang and the C₄ grass Setaria viridis (L.) Beauv. were studied to improve interpretation of the paleoenvironmental signatures of plant wax n-alkanes in sediments and soils. The molecular composition and isotopic composition...

article

Paleoclimate significance of n-alkane molecular distributions and δ2H values in surface peats across the monsoon region of China

Xianyu Huang, Philip A. Meyers, Jiantao Xue, Yiming Zhang, more

Palaeogeography, Palaeoclimatology, Palaeoecology > 2016 > 461 > C > 77-86

Leaf wax molecular distributions and isotopic values are generally considered paleohydrologic proxies. Here we evaluate the sensitivity of alkane chain length distributions and compound-specific hydrogen isotopic compositions (δ²H_alk) in surface peats to environmental parameters across the monsoon region of China. The alkane average chain length (ACL), carbon predominance index (CPI) and δ²H_alk values...

article

Environmental impacts on the distribution of microbial tetraether lipids in Chinese lakes with contrasting pH: Implications for lacustrine paleoenvironmental reconstructions

XinYue Dang, JianTao Xue, Huan Yang, ShuCheng Xie

Science China Earth Sciences > 2016 > 59 > 5 > 939-950

Glycerol dialkyl glycerol tetraethers (GDGTs) in lake sediments are useful biomarkers for the continental paleoclimatic reconstruction. However, the environmental controls on the distribution of these compounds, in particular the 6-methyl isomers of bacterial branched GDGTs (bGDGTs), in the lakes with contrasting pH, are still unknown, hindering their application for paleo-reconstructions. Here, we...

article

Comparisons of lipid molecular and carbon isotopic compositions in two particle-size fractions from surface peat and their implications for lipid preservation

Xinxin Wang, Xianyu Huang, Dirk Sachse, Yu Hu, more

Environmental Earth Sciences > 2016 > 75 > 15 > 1-13

Knowledge of the possible impacts of early diagenesis on lipid biomarkers in geologic settings is important for robust applications of lipid proxies for paleoclimate reconstructions. In this study, molecular distributions and carbon isotopic compositions of lipids were compared in two particle-size fractions (<0.3 mm and >0.3 mm) of twelve surface peat samples collected from Dajiuhu peatland,...

article

Testate amoebae as indicators of water quality and contamination in shallow lakes of the Middle and Lower Yangtze Plain

Yangmin Qin, Richard Payne, Xiangdong Yang, Min Yao, more

Environmental Earth Sciences > 2016 > 75 > 7 > 1-11

Testate amoebae are micro-organisms characterized by an agglutinated or autogenous shell enclosing the cytoplasm. Testate amoebae have been widely proposed as valuable bioindicators in a range of ecosystems (such as soils, peatlands and lakes). The use of testate amoebae as bioindicators of water quality in aquatic ecosystems is much less developed than for other microorganisms and previous research...

article

Environmental factors affecting the low temperature isomerization of homohopanes in acidic peat deposits, central China

Xianyu Huang, Philip A. Meyers, Jiantao Xue, Linfeng Gong, more

Geochimica et Cosmochimica Acta > 2015 > 154 > Complete > 212-228

Progressively more evidence reveals the abundant occurrence of the C ₃₁ homohopane with a 17α, 21β-configuration (C ₃₁ αβ) in immature peats. This compound is commonly considered to be an indicator of thermal maturity in petroleum source rocks, but in peats it has also been interpreted to reflect the oxidation and subsequent decarboxylation reactions of bacteriohopanepolyols with microbially...

article

Hydrologic influence on the δ13C variation in long chain n-alkanes in the Dajiuhu peatland, central China

Xianyu Huang, Jiantao Xue, Philip A. Meyers, Linfeng Gong, more

Organic Geochemistry > 2014 > 69 > Complete > 114-119

Symbiotic methanotrophic bacteria are prevalent on the stems or in the hyaline cells of Sphagnum spp. in peat-moss ecosystems and can contribute a significant amount of isotopically light carbon for moss photosynthesis. Despite this, the influence of the methanotrophs on the δ ¹³ C values of Sphagnum-derived lipids is poorly known, especially in peatland lawn or hummock conditions that do...

article

Cryptic abundance of long-chain iso and anteiso alkanes in the Dajiuhu peat deposit, central China

Xianyu Huang, Philip A. Meyers, Jiantao Xue, Xinxin Wang, more

Organic Geochemistry > 2014 > 66 > C > 137-139

Long chain 2-methyl and 3-methyl alkanes occur widely in modern plants and in recent and ancient sediments, but their presence in peat deposits has not been reported. Here, we document an early Holocene enrichment of long chain 2-methyl alkanes in the Dajiuhu peat deposit, accompanied by traces of 3-methyl alkanes. The 2-methyl alkanes showed a strong odd/even predominance and were dominated by C₂₇...

article

Paleoclimate influence on early diagenesis of plant triterpenes in the Dajiuhu peatland, central China

Xianyu Huang, Jiantao Xue, Xinxin Wang, Philip A. Meyers, more

Geochimica et Cosmochimica Acta > 2013 > 123 > Complete > 106-119

Aromatic derivatives of vascular plant triterpenoids are common in recent and ancient sediments, coal, and petroleum. Understanding their early diagenetic alterations and their relation with environmental conditions can facilitate their applications in paleoenvironmental reconstructions. Here we present a high-resolution record of aromatic triterpenes in a Holocene peat core collected in the Dajiuhu...

chapter

Beijing Spectrum Survey for Cognitive Radio Applications

Jiantao Xue, Zhiyong Feng, Kai Chen

2013 IEEE 78th Vehicular Technology Conference (VTC Fall) > 1 - 5

2013 IEEE 78th Vehicular Technology Conference (VTC Fall)

In order to investigate the status of the radio spectrum usage with different services in Beijing, we have conducted a 24-hour spectrum measurement and spectrum usage pattern analysis in May 2012 in the frequency bands ranging from 440 MHz to 2700 MHz. Based on the measurement results, we try to identify the suitable bands for new spectrum access technologies such as cognitive radio which can improve...

article

Spectrum Occupancy Measurements and Analysis in Beijing

Jiantao Xue, Zhiyong Feng, Ping Zhang

IERI Procedia > 2013 > 4 > Complete > 295-302

A 24-hour spectrum measurement campaign was performed in Beijing in 2012 August in the frequency bandwidth which is 450-2700MHz in order to find out the radio spectrum allocation situation in Beijing, and identify frequency bandwidth which can be used by dynamic spectrum access devices. The results from the spectrum measurements indicate that a lot of spectrum in Beijing has very low signal occupancy...

article

Effect of different wetness conditions on Sphagnum lipid composition in the Erxianyan peatland, central China

Xianyu Huang, Jiantao Xue, Jinxiang Zhang, Yangmin Qin, more

Organic Geochemistry > 2012 > 44 > Complete > 1-7

Samples of Sphagnum palustre and peat from the Erxianyan peatland, central China, were analyzed for lipids and their carbon isotopes to investigate how lipid distributions respond to hydrological change and to evaluate the importance of the contribution of microbial lipids to the peat moss. The lipids in samples collected from different hydrological settings in and around a pond and in the central...

article

Long chain n-alkanes and their carbon isotopes in lichen species from western Hubei Province: implication for geological records

Xianyu Huang, Jiantao Xue, Shouyu Guo

Frontiers of Earth Science > 2012 > 6 > 1 > 95-100

Five coticolous lichen samples were collected from western Hubei Province of China to analyze the long chain n-alkanes and their carbon isotope compositions. The n-alkanes range in carbon number from C₁₇ to C₃₃ with strong odd-over-even predominance between C₂₁ and C₃₃. Lichens are dominated by n-C₂₉ in the samples of Dajiuhu, Shennongjia Mountain, but by both n-C₂₃ and n-C₂₉ at Qizimei Mountain....

chapter

Optimized strategies for coordinated spectrum sensing in Cognitive Radio Networks

Zaili Wang, Zhiyong Feng, Di Zhang, Jiantao Xue, more

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) > 96 - 100

2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM)

In Cognitive Radio Networks, coordinated spectrum sensing is a novel technique that the cognitive terminals are assigned to sense different channels in the same sensing slots in order to obtain the occupancy status of all the channels in every sensing period. In this paper the coordinated spectrum sensing strategies are discussed, the functional architecture is put forward, a Kuhn-Munkres based, alongside...

chapter

Optimal Cooperative Spectrum Sensing Strategies in Cognitive Radio Networks

Jingqun Song, Jiantao Xue, Zhiyong Feng, Ping Zhang, more

2010 IEEE 71st Vehicular Technology Conference > 1 - 6

2010 IEEE Vehicular Technology Conference (VTC 2010-Spring)

Spectrum sensing is the key functionality of cognitive radio. To combat with the effects of destructive channels, cooperative spectrum sensing technique among multiple secondary users has been proposed in cognitive radio networks. In this paper, we present an optimal cooperative spectrum sensing strategy to maximize the sensing efficiency, which not only concerns with the system overhead of spectrum...

chapter

Optimal Parameters for Cooperative Spectrum Sensing in Cognitive Radio Systems

Jingqun Song, Zhiyong Feng, Dian Fan, Jiantao Xue, more

2010 IEEE Wireless Communication and Networking Conference > 1 - 5

2010 IEEE Wireless Communications & Networking Conference (WCNC 2010)

In cognitive radio systems, cooperative spectrum sensing is executed among multiple secondary users to detect spectrum holes without causing deleterious interference to primary users. The larger the number of cooperating secondary users, the greater the performance gain of cooperative sensing. However, the complexity of the cognitive radio system will rapidly increase in the meantime. This paper introduces...

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INFONA - science communication portal

Search results for: Jiantao Xue

An MDL-MUSIC joint time delay estimation method for LTE PRS

Analysis of Localization Using Multipath Characteristics as Location Fingerprint

Effects of early diagenesis on molecular distributions and carbon isotopic compositions of leaf wax long chain biomarker n-alkanes: Comparison of two one-year-long burial experiments

Fidelity of plant-wax molecular and carbon isotope ratios in a Holocene paleosol sequence from the Chinese Loess Plateau

Monthly changes in chain length distributions and stable carbon isotope composition of leaf n-alkanes during growth of the bamboo Dendrocalamus ronganensis and the grass Setaria viridis

Paleoclimate significance of n-alkane molecular distributions and δ2H values in surface peats across the monsoon region of China

Environmental impacts on the distribution of microbial tetraether lipids in Chinese lakes with contrasting pH: Implications for lacustrine paleoenvironmental reconstructions

Comparisons of lipid molecular and carbon isotopic compositions in two particle-size fractions from surface peat and their implications for lipid preservation

Testate amoebae as indicators of water quality and contamination in shallow lakes of the Middle and Lower Yangtze Plain

Environmental factors affecting the low temperature isomerization of homohopanes in acidic peat deposits, central China

Hydrologic influence on the δ13C variation in long chain n-alkanes in the Dajiuhu peatland, central China

Cryptic abundance of long-chain iso and anteiso alkanes in the Dajiuhu peat deposit, central China

Paleoclimate influence on early diagenesis of plant triterpenes in the Dajiuhu peatland, central China

Beijing Spectrum Survey for Cognitive Radio Applications

Spectrum Occupancy Measurements and Analysis in Beijing

Effect of different wetness conditions on Sphagnum lipid composition in the Erxianyan peatland, central China

Long chain n-alkanes and their carbon isotopes in lichen species from western Hubei Province: implication for geological records

Optimized strategies for coordinated spectrum sensing in Cognitive Radio Networks

Optimal Cooperative Spectrum Sensing Strategies in Cognitive Radio Networks

Optimal Parameters for Cooperative Spectrum Sensing in Cognitive Radio Systems

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