Showing papers presented at "IEEE International Conference on Advanced Infocomm Technology in 2014"

Research on car-following model based on SUMO

Abstract: Vehicular Ad Hoc Network (VANET) is a promising platform for the Intelligent Transportation System (ITS). Car-following theory is a significant research direction in the field of VANET, it describes the one-by-one following process of vehicles on the same lane in traffic flow. The paper analyzed Krauss car-following model and proposed a new model based on the speed safe and Krauss model in SUMO 0.21.0 platform to improve the authenticity of model. We implement it on the SUMO platform. This model considers the movement state of the car and the gradual process of deceleration in vehicles braking. Simulation experimental results show the superiority of new model over other ones in simulation that models real streets. It achieves good results in wait time, travel time, lane-change number and safe speed.

Radar-communication integration: An overview

Abstract: Radar-communication integration combines radar system and communication system together These two systems have similar structures, and communication system can take advantage of radar's excellent hardware features if integrated This technique is still under study and may take decades to achieve practical application The motivation of such integration is presented in the beginning of this paper Main approaches including time-sharing, sub-beams and signal-sharing are shown, and the most promising signal-sharing approach is detailed discussed with its three typical realizations Characteristics, including advantages and disadvantages of these approaches are also analyzed Three typical integration application scenarios are described in the end of this paper

AODV-PNT: An improved version of AODV routing protocol with predicting node trend in VANET

Abstract: In this paper, According to the topology characteristics of VANET, We proposed a new routing protocol that is suitable for VANET communications within the cluster based on AODV: AODV with predicting node trend (AODV-PNT). There are two major improvements in AODV-PNT: (1) Routing metric improvements and calculate Total Weight of the Route (TWR). (2) Predict node's future TWR and calculate stable threshold W in a bid to choose a suitable relay node. Finally, we simulated AODV-PNT using ns2. The simulation results show that AODV-PNT is able to achieve better routing performances in packet deliver ratio, average end-to-end delay and routing overheads as compared to AODV.

Improved lane-changing model for vanets in SUMO

Abstract: As an important branch of mobile Ad Hoc network technology, Vehicular Ad hoc Network (VANET) is a promising technology in Intelligent Transportation Systems (ITS). It is required to evaluate any VANET design which the simulator with vehicular mobility model should be more realistic. In order to improve the authenticity of vehicular mobility model, the paper analyzed JE2013 lane-changing model in SUMO and proposes a new model based on the JE2013 model. The new model takes into account motorway scene, and analyzes the change of vehicle velocity and calculates the position coordinate after lane-changing which based on speed limitation per lane on motorway. By implementing the new model in SUMO platform and carrying out experiments for the two models under the same situation. Simulation experimental results indicate that the new model is more reality and has better performance on several parameters, such as travel time of vehicle and the lane-changing times, etc.

A reliable routing protocol based on QoS for VANET

Abstract: Vehicular Ad Hoc Network (VANET) is a new form of wireless ad hoc network to provide multi-hop wireless communication among vehicle and nearby roadside equipment. With the development of VANET, it is more and more important to provide QoS guarantee for multimedia application. Considering the characteristics of VANET in highway traffic environment, this paper proposes a reliable QoS routing protocol called RQ-AODV (the reliable QoS routing protocol based on Ad Hoc on-demand distance vector) for VANET. RQ-AODV can find a reliable routing path with multiple QoS constraints, such as bandwidth, delay. The simulation results in NS2 show that the performances of RQ-AODV are better than AODV in packet drop ratio and end-to-end delay.

Relative humidity sensor based on optical fiber gratings and polyvinyl alcohol

Abstract: A relative humidity (RH) sensor operating in reflection mode is proposed and experimentally demonstrated by using a polyvinyl alcohol (PVA)-coated tilted-fiber Bragg grating (TFBG) cascaded by a reflection-band-matched chirped-fiber Bragg grating (CFBG) The sensing principle is based on the RH-dependent refractive index (RI) of the PVA coating which modulated the transmission of the TFBG The CFBG is properly designed to reflect a broadband of light spectrally suited at the cladding mode resonance region of the TFBG, thus the reflected optical signal passes through and the intensity is modulated by the TFBG twice so that the sensitivity improves significantly RH measurement with sensitivity of ~17402 μW/% RH in the range from 20% to 90% is realized

Photonic RF channelization based on series-coupled asymmetric double-ring resonator filter

Abstract: A novel photonic channelizer based on a series-coupled asymmetric double-ring resonator (SADRR) filter is proposed. Due to the vernier effect in series-coupled double-ring resonator, the novel filter has a small shape factor and relatively large free spectral range (FSR), which can contribute to obtaining high-precision signal. In the proposed channelizer, the RF signal is multicasted by an optical frequency comb (OFC) spectrally sliced by the SADRR filter and finally channelized by an optical wavelength-division multiplexer (WDM). A 5-channel channelizer centered at 1~9 GHz with a 2-GHz step is achieved by numerical simulation.

Miniature pH sensor based on optical fiber Fabry-Perot interferometer

Abstract: An optical fiber Fabry-Perot interferometer (FPI) coated with polyvinyl alcohol/poly-acrylic acid (PVA/PAA) hydrogel is proposed for pH value measurement. The FPI is formed by splicing a section of hollow-core photonic crystal fiber (HCPCF) between two standard single mode fibers. Its optical path different is modulated by the coated PVA/PAA hydrogel sensing film through swelling effect which depends on pH value of the tested solution. High sensitivity up to 11nm/pH is achieved within the pH value range between pH 4.1 and pH 6.9.

Estimation of flight delay using weighted Spline combined with ARIMA model

Abstract: Adding to societal changes today, are the miscellaneous big data have been produced in different fields Coupled with these data is the appearance of data risk management and data mining Admittedly, to predict future trend by using these data is conducive to make everything more efficient and easy This paper develops a new prediction model of flight departure delay By studying the main factors lead to flight delay, the paper takes weather, holiday influences and hourly pattern as variables of the mixed function by combining smoothing Spline function with ARIMA models We optimized and simulated with 3 years of data from American Airline By utilizing our model can predict delays of each flight on a specific day and hour The result demonstrates the goodness of fit

Tunable femtosecond Cherenkov fiber laser

Abstract: We demonstrate electrically-tunable femtosecond Cherenkov fiber laser output at the visible range Using an all-fiber, self-starting femtosecond Yb-doped fiber laser as the pump source and nonlinear photonic crystal fiber link as the wave-conversion medium, ultrafast, milliwatt-level, tunable and spectral isolated Cherenkov radiation at visible wavelengths are reported Such a femtosecond Cherenkov laser source is promising for practical biophotonics applications

An improved integration sensor of non-invasive blood glucose

Abstract: This work is intended to design an integration sensor for non-invasive blood glucose detection (ISNBGD) with low power consumption, fast detection speed and high accuracy. Based on the modified conservation of energy metabolism theory, the blood glucose level (BGL) is acquired by a multi-linear regression equation of a rate of human metabolism, blood flow, oxygen saturation of hemoglobin, and pulse frequency. These physiological parameters are obtained by ISNBGD with a size of 60mm × 30mm × 85.5mm, which is integrated with temperature sensors, humidity sensors, radiation sensors, and dual wavelength photo-detectors with 660nm and 905nm. 30 healthy volunteers are involved in the preliminary clinical experiment. These blood glucose concentrations ranging from 3.5 to 6.5mmol/L are compared with automatic biochemical analyzer (ABA) as the gold standard. The correlation coefficient of BGL is up to 0.8621 between the ISNBGD and ABA, and the ISNBGD has strong correlation and good coherence. Moreover, multi-physiological parameters can be measured by the ISNBGD including body temperature, local metabolic rate, blood flow, oxygen saturation, and heart rate simultaneously.

High fidelity, pitch-by-pitch grating inscription in free-standing single-mode optical fiber

Abstract: A pitch-by-pitch grating inscription method that allows both high laser intensity and long-exposure dosage when inscribing each pitch is demonstrated Based on slit beam-profiling, proposed scheme does not require oil-immersion-based beam distortion compensation techniques for inscription into free-standing single-mode fiber High grating fringe visibility inscription is achieved for 107μm-period structure in single-mode fiber even though each grating pitch are individually defined by 50msec-long laser exposure

Downlink sub-channel allocation algorithm for OFDMA-based multi-cell networks

Abstract: This paper presents a sub-channel allocation algorithm for OFDMA-based multi-cell networks where co-channel interference from nearby cells is serious in the downlink transmission. The algorithm is semi-distributed in the sense that the sub-channel allocation can be split between radio network controller (RNC) and base stations (BSs). RNC will decide the sub-channels used by each BS at the super-frame level, in order to avoid inter-cell co-channel interference. Moreover, BSs will decide the sub-channels allocated to each user to maximize entire network throughput according to the channel state information as well as the load distribution at the frame level. The sub-channel allocations at RNC and BSs are formulated as two optimization problems which are solved by RNC algorithm and BS algorithm, respectively. Simulation results show that the proposed algorithm can improve the network performance in terms of network throughput and sub-channel utilization.

Differential coding and detection methods in SC-FDMA systems

Abstract: In this paper, the differential encoding and detection methods in single-carrier frequency-division multiple access (SC-FDMA) systems are investigated. Like in OFDM systems, the differential encoding can be performed in time-domain or frequency-domain in SC-FDMA systems. Also, we can use differential encoding before or after the discrete Fourier transform (DFT) process. Thus the detail design of transmitter with each of the four differential coding methods and the corresponding detection methods is considered and analyzed.

A novel MAC protocol for VANET based on Improved Generalized Prime Sequence

Abstract: Protocol sequences are used for multiple access in the collision channel without feedback In order to increase inter-cluster packet delivery radio in cluster-based VANETs, a MAC protocol based on Improved Generalized Prime Sequence (IGPS) is proposed in this paper Extra transmitting time slots are inserted in Generalized Prime Sequence (GPS) of cluster heads while the corresponding positions in GPS of cluster members are inserted with extra receiving time slots Compared to the MAC protocol based on GPS, the proposed MAC protocol guarantees the inter-cluster data transmission when the conflict occurred between inner-cluster and inter-cluster communication Numerical results illustrate that the performance of IGPS-based scheme is superior to GPS-based one in terms of packet delivery ratio and throughput in the inter-cluster communication

A flow based method to detect penetration

Abstract: With the rapid expansion of the Internet, network security has become more and more important. IDS (Intrusion Detection System) is an important technology coping network attacks and is of two main types: network based (NIDS) and host based (HIDS). In this paper, we propose the conception of NFPPB (Network Flow Patterns of Penetrating Behavior) to network vulnerable ports and design a NIDS algorithm to detect infiltration behaviors of attacker. Essentially, NFPPB is a set of metrics calculated by network activities exploiting the vulnerabilities of hosts. The paper investigates choosing, generation and comparison of NFPPB metrics. Experiments show that the method is effective and with high efficiency. At last, the paper addresses the future direction and the points that need to be improved.

A high-speed quantum key distribution system based on Faraday-Michelson interferometers

Abstract: For the unconditional secure quantum key distribution (QKD), Faraday-Michelson interferometers (FMI) based system provide an intrinsic way to avoid the influence from the birefringence effect through fiber In our paper, we designed an electronics system for the FMI-based QKD system with high repetition rate The system was tested in 125 MHz repetition rate for more than 16 hours and obtained a quantum bit error rate less than 4%, which is to our knowledge the highest repetition rate result for FMI-based QKD system

An indoor positioning algorithm for mobile objects based on track smoothing

Abstract: In this paper, a new indoor positioning algorithm is proposed for mobile objects based on track smoothing. Considering the effects of indoor environment and the individual anchor nodes, the algorithm is realized in two filtering phases to modify the UWB range measurements and the trilateration localization results by the Unscented Kalman Filter, which reduces the influence of the additive non-Gaussian noise. Furthermore, the filtered positioning results of a mobile object are smoothed by a proposed adaptive smoothing algorithm, and the accuracy has been significantly improved with the positioning RMSE less than 0.8m and the maximum error is about 1m.

Adaptive comp downlink transmission mode selection in backhaul-constrained cellular systems

Abstract: CoMP has been adopted in 3GPP LTE-Advanced to improve the coverage of high data rates And the downlink transmission mode, JP or CB, should be selected for base station cooperation when the backhaul capacity is limited In this paper, considering different numbers of users, we propose an adaptive transmission mode selection To mitigate the performance degradation caused by mismatching between numbers of transmitting antennas and MSs, we develop a strategy with proportional fairness that takes into account backhaul constraints and users selection The simulation results show that the proposed algorithm provide considerable performance gains in the sum rates per cell and the cell-edge user throughput under constrained-capacity backhaul links

Study on reputation and trust based data aggregation schemes for wireless sensor networks

Abstract: In wireless sensor networks or WSNs, data aggregation as one of the most important techniques aims to refine the transmitted data and reduce the communication overhead between sensor nodes so as to improve the sensing efficacy as well as enhance the life span of the whole network In this article, we first present the current study of reputation/trust schemes and data aggregation methods in WSNs, then according to the analysis of the study, a reputation based data aggregation method is proposed in this research, in which energy residual is considered and incorporated as a parameter together with reputation value as a measurement to select data aggregators Simulations show that our method can balance the energy consumption of sensor nodes and provide reliability to the data aggregation in wireless sensor networks

Optoelectronic oscillators based on polarization modulation

Abstract: A polarization modulator (PolM) incorporating with a polarizer and an optical filter can realize various functions such as phase modulation, intensity modulation with tunable chirp or frequency multiplication, tunable microwave photonic phase shifting, etc Using a PolM to replace the intensity modulator in a traditional optoelectronic oscillator (OEO), various new features have been discovered In this paper, the recent developments in employing PolMs for constructing different types of OEOs are reviewed and the emerging applications enabled by the PolM-based OEOs are discussed

AODV-MR: AODV with multi-RREP for VANET

Abstract: VANETs are a promising situation to improve the road traffic safety, traffic monitoring and other applications. However, the vehicles mobility and versatile topology lead to frequent failure of VANET links. In this paper, we propose a new scalable routing scheme named AODV-MR (AODV with multi-RREP). A novel metric is used to detect the link connectivity, which is calculated in every node by broadcasting HELLO messages during the route discovery, source vehicle receiving multi-RREPs will determine the optimal route and suboptimal route by considering the factors of minimal hops and route cost metric (RCM). Moreover, the AODV-MR plays a key role in repairing broken routes and the carry-and-forward mechanism was utilized to repair route. Simulation results show that the performance of new scheme is superior to AODV in terms of high packet delivery radio, links reliability and end to end delay.

A fault-tolerant recognition method for services packets based on center distance and BP net

Abstract: In view of the appearance of error bits in the process of data transmission, the individual erroneous bit of real-time services do not affect the use of services packets. The fault-tolerant type recognition of real-time packet is the first problem in the process of restructuring. In this paper, a non-linear recognition method which combined “center distance” and BP net together is proposed and applied to factual data for erroneous packets, The results show that the method proposed performs much better than the regular method.

First principles study of half Heusler alloys PdFeBi and PdCoBi

Abstract: First principles calculations based on density functional theory have been performed on half-Heusler alloys PdFeBi and PdCoBi of three different atomic configurations This structural difference comes from the placement of the transition-metal element Pd, Fe, Co and the main group element Bi and the vacancy within the full-Heusler structure The optimized lattice constant and electronic properties are determined by calculation The comparison of total energy, lattice constant and magnetic moment are made for PdFeBi and PdCoBi The differences reflect the atomic arrangements of the three phases and varied transition metal elements Fe, Co A simple and rational physical reason is given too The localized magnetic moments come from the d-d interaction between the transition metal elements Due to the large magnetic moment, the possible applications for these half-Heusler alloys are given

A watermarking based authentication and image restoration in two-layer multimedia sensor networks

Abstract: In this paper, we proposed a novel watermarking based secure image acquisition scheme for two-layer visual sensor networks, which provides support for image authentication and restoration. In this scheme, the sensor node groups image frames, and two successive frames compose the non-overlapping authentication and restoration group. The watermarking bits which are the version of the down sampling image are computed from the first image and reversibly embedded into the second one before storage. The sink does the verification and restoration by reversible watermark. Compared with the previous work, our approach can not only implement authentication but also improve image quality. Analysis and experimental results show that our scheme can achieve gains in terms of authentication performance and efficient packet loss tolerance to improve the image quality.

A low power frequency synthesizer chip with aperture phase detector and phase to analog converter

Abstract: This paper presents a 018 μm CMOS low power frequency synthesizer with aperture phase detector (APD) and phase to analog converter (PAC) to reduce noise and power, and achieves lower reference spur In locked state, the synthesizer can capture and compare the reference and VCO output signal directly by APD, and then PAC generates signal to control the current amplitude of charge pump At 12 V supply voltage, measured results of the synthesizer shows a tuning range from 2256 to 2481 GHz, corresponding to 95%, a phase noise of −11322 dBc/Hz at 1 MHz offset from 2406 GHz, a power consumption of 45 mW, and a reference spur of the synthesizer is less than −60 dBc Including pads, the chip area occupies 082 (0941 × 0871) mm2 for wireless communication

An optimization strategy for DSR protocol

Abstract: This paper puts forward an improved DSR protocol which adopts adaptive routing shortening through introducing time parameters after analyzing the route select, buffer strategy and its limitations New strategy not only improves the route quality of the buffer but also makes full use of its space The simulation shows that this improved protocol has distinct performance after optimization

Stretched abrupt-tapered micro fiber for high sensitivity interferometric laser strain sensors

Abstract: We demonstrate the temperature-insensitive strain sensors based on stretched abrupt-tapered micro-fiber in the erbium fiber laser ring cavity. The strain sensitivity is significantly enhanced to 4.443 nm/me by properly choosing the diameter at wavelength scale.

A new system for recording the radiological effective doses from imaging investigations

Abstract: The Romanian project of an integrated system for radiation safety of the patients investigated by radiological imaging methods is presented in this paper. The new system is based on smart cards and Public Key Infrastructure. The new system allows radiation effective dose data storage and a more accurate reporting system.

Carrier phase estimation schemes with bit-error-rate independent and modulation format transparency

Abstract: Low complexity carrier phase estimation (CPE) with bit-error-rate independent and modulation format transparency is very important for coherent optical communication receiver, and is still a challenge task. We propose a series of schemes of good performance and low complexity CPE, including an optical pilot-tone-added (PA) method and a crossed constellation transformation (CCT) algorithm, which are proved to be linewidth tolerant, bit-error-rate independent, modulation format transparent, and low complexity. We introduce an optical pilot-tone-added CPE scheme for a dual-carrier Nyquist m-QAM system. We also present a multi-stage CPE scheme based on CCT for either the square-frame m-QAM like 64QAM or the non-square-frame m-QAM like 32-QAM and 128-QAM.