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In this study, the authors propose a semidefinite programming (SDP)-based localisation and tracking algorithm, which mitigates the non-line-of-sight (NLOS) error of range measurement and calibrates the accumulative error within the inertial sensing data. Both the range measurement in a mixed line-of-sight/NLOS environment and the step length estimated from inertial sensing information are approximated...
In this paper, we propose a localization algorithm in a visible light communication (VLC) system based on the light intensity. Firstly, by developing a VLC platform, the light intensity can be measured to derive a practical equation, which reveals the relationship between the received signal strength (RSS) and the distance from the transmitter to the receiver. However, the practical additive noise...
We focus on the topology control algorithm in Software-Defined Sensor Networks (SDSNs) and propose a robot-assisted sink nodes relocation algorithm based on the Markov chain. Firstly, by using the software-defined architecture, sensor nodes and network topology can be deployed and updated by the controller which provides global network information and centralized management in real time. Then robot-assisted...
An Ad-hoc mobile cloud can be constructed upon local devices, where devices work together and share resources. However, the deployment of Ad-hoc mobile cloud is hindered by the limitation of mobile devices, such as storage capacities and relatively short battery lives. To overcome such problem, this paper proposes a task assignment algorithm based on particle swarm optimization and simulated annealing...
This paper mainly focuses on developing a joint cloud and wireless resource allocation algorithm based on evolutionary game (JRA-EG) considering mobile terminals' energy consumption and time delay as well as monetary cost in mobile edge computing environment. The mobile terminals (MTs) in different service areas form different populations. In addition, the competition among populations of MTs in different...
In this paper, a three-dimensional (3-D) positioning system using fingerprinting and K-Nearest neighbor is proposed. The implementation of the proposed positioning system based on visible light communication (VLC) is discussed. On-off keying (OOK) modulation, Manchester coding and time division multiplexing (TDM) are utilized to obtain both lossless data and accurate received signal strength indications...
In this paper, a positioning system is designed based on the visible light communication (VLC) technology for the tracking of mobile target in the indoor environment. The practical received signal strength (RSS) can be measured for subsequent positioning algorithm by using the designed system. Based on the practical measurements, an empirical equation is proposed to estimate the target's distances...
In this paper, an indoor localization system is implemented, in which the distances are measured via by the Ultra-Wideband (UWB) and are utilized to determine positions of one blind node through trilateration localization algorithm. Additionally, to overcome the measurement errors caused by complex indoor environment, an Unscented Kalman Filter (UKF) algorithm is proposed to improve the accuracy of...
Localization technologies in wireless sensor networks have been suffering from great energy consumption problem due to the energy-constrained characteristic of the networks. Existing power allocating solutions are mostly distributed for the lack of global network knowledge. In this paper, we investigate localization algorithm with the support of software-defined network (SDN) technique and propose...
The paper illustrates to integrate UWB technology with inertial navigation, and introduces the design of the hybrid indoor positioning system including server, gateway and sensor nodes. A linear regression matrix model is proposed to modify inertial navigation path. Least squares method is used to determine equations relating UWB trajectories to inertial navigation trajectories. Experimental results...
This paper introduces an indoor positioning system which is built with heterogeneous sensors, i.e., inertial sensors and ultra wide band (UWB) ranging modules. It takes a hybrid approach with Inertial Navigation and UWB ranging method to explore their cooperative efforts. Besides, a novel hybrid algorithm for single-anchor positioning and calibration is proposed, which combines real-time inertial...
In this paper, two resource allocation schemes based on genetic algorithm (GA) in heterogeneous wireless networks are proposed. The first scheme is called traffic-based resource allocation scheme (TRAS) which allocates the resource mainly based on the bandwidth requirements of traffic and bandwidth availability. In the second scheme which is called utility-based resource allocation scheme (URAS),...
A delay-aware resource allocation algorithm for the heterogeneous multi-radio access (MRA) system, where multiple mobile terminals are served by long term evolution (LTE) and wireless local area network (WLAN) access technologies, is proposed in this paper. Taking both the queue dynamics and physical layer metrics into account when modeling the problem, the algorithm is designed to stabilize all queues...
This study proposes an analytical model and an effective scheme for the periodic broadcast on the control channel in vehicular ad hoc networks (VANETs). An improved Markov model for analysing the performance of the periodic broadcast in VANETs is established. Compared with the traditional two-dimensional Markov chain models, the improvement of our proposed model is achieved by the considerations of...
Femtocell with the open access mode benefits the macrocell users (MUE) which locate closely to the femtocell base station (FBS). However, how to enhance these users' performance with the femtocell registered users quality of service (QoS) protection becomes a major problem. Deploying relay outside the femtocell networks is an economical and effective option to reduce the cross-tier interference while...
This paper proposes a design and implementation of the On-Board Unit (OBU) in the Vehicular Ad Hoc Network (VANET) for highways, and realizes vehicle-to-vehicle (V2V) communication. The system is divided into four parts including central control module, wireless communication module, GPS module, and human-machine interface module. The hardware platform is consisting of an ARM11-based embedded development...
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...
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...
The needs for location-aware applications are increasing with the popularity of ubiquitous mobile computing. However, as an important factor affecting the positioning performance, the deployment of anchor nodes has received little attention during the past years. In this paper we investigate the anchor placement in the received signal strength (RSS) based wireless localization systems. An optimization...
In this paper, a load-based joint call admission control (LJCAC) scheme for heterogeneous wireless networks is proposed. The LJCAC scheme aims to achieving the load balance in heterogeneous networks as well as guaranteeing the quality of service (QoS) satisfaction. We also develop the analytical models to calculate the connection-level performance of the proposed LJCAC scheme in two typical heterogeneous...
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