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This paper proposed a robust spatial spectrum sensing algorithm to apply to a communication scenario which exist the estimated error of noise power and the jamming. A modified approximate model is proposed to include the estimated error of noise power and the jamming. The corresponding performance indicators are proposed. The proposed robust algorithm estimates the estimated error vector of noise...
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 the Internet of things, trust establishment plays an important role of improving cooperation and enhancing security. To evaluate the trust relationships among sensor nodes accurately, an appropriate trust estimation model should be designed so as to against attack and misbehavior effectively. In this paper, a novel quantitative model of trust value is proposed. A variety of trust factors related...
Differential encoded LDPC (DE-LDPC) coded systems with multiple symbol differential detection (MSDD) scheme can avoid good estimation of channel state information and compensate performance degradation of differential detection. In this paper, LDPC codes optimization for the DE-LDPC coded systems with MSDD is studied. Simulation results show that the optimized LDPC codes perform much better than the...
In this paper, we present an analog voice transmission system based on Visible Light Communication (VLC). At the transmitter of the system, by the Voltage-Frequency (V-F) conversion circuit, the analog voice signal is transformed into the frequency signal, which is linear with the amplitude of the signals. At the receiver, the voice signal can be demodulated by the Frequency-Voltage (F-V) conversion...
This paper proposed an approximate model for the global power spectral density (PSD) of primary users (PUs). Based on the proposed model, a novel cooperative spectrum sensing algorithm was proposed, and its overall flow was also built to obtain global information in the network of PUs. The global information includes locations, occupied frequency bands and transmit powers of the PUs. Then, an estimator...
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...
With the need of localization based services increasing, many algorithms are proposed using distance between two points and path loss exponent of the environment. In this paper, we propose an algorithm using received signal strength, Doppler Effect and frequency diversity in vehicular networks. The algorithm can estimate the path loss exponent and distance dynamically in mobile communication environment...
Visible-light wireless communication is an optical communication technology rising with the development of white LED lighting technology. Based on the analysis of current visible light communication technology, the paper aims at the application requirement of m-ary modulation communication system, and designs the component of APD receiving circuit. Firstly, this article specifies the operating principle...
In this paper, an adaptive blind equalization method is proposed for differential single-carrier frequency-division multiple access (SC-FDMA) system. Both time domain equalizer and frequency domain equalizer are investigated to combat the frequency selective fading. Simulation results show both the time domain and frequency domain equalization can improve the performance of differential SC-FDMA system...
In this paper, multiple-symbol differential detection (MSDD) is applied to the differential single-carrier frequency-division multiple access (SC-FDMA) system. Both time domain and frequency domain MSDD are investigated to compensate for the performance loss of conventional differential detection comparing with coherent detection. The decision metric of time and frequency domain MSDD for SC-FDMA are...
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...
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...
In this paper, the differential unitary space-time-frequency coding (DUSTFC) scheme is applied in the single-carrier frequency-division multiple access (SC-FDMA) systems. The structure of transmitter and corresponding receiver is considered. The diversity gain of DUSTFC in SC-FDMA system are confirmed by simulation results in both time-domain and frequency-domain differential coding cases.
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...
This paper proposes a hybrid step length model and a new azimuth estimation method based on the Pedestrian Dead Reckoning for personal indoor positioning. The hybrid step length model combines the information of the walking frequency and the variance of accelerations with the amplitudes of the acceleration signal. By weighting the azimuth estimated through the gyroscopes and the magnetometers respectively...
The research of localization has become a more and more important topic with the popularity of ubiquitous mobile computing. In indoor environment, since the global positioning system (GPS) is disabled, many miniaturized wireless and sensing technologies have shown giant potential in positioning applications such as Inertial Navigation. In this context, this paper present a methodology to locate and...
We experimentally demonstrate a visible light communication (VLC) system using pulse amplitude modulation (PAM). A commercially available phosphorised white LED is used as the optical transmitter and a Si photodiode (PD) is used as the optical receiver. The experiment is mainly implemented in an indoor environment which is influenced by the sunlight and fluorescent lamp. In variant conditions, the...
A novel cooperative spectrum sensing approach is introduced based on a approximate model of the power spectral density (PSD) map in space and frequency domain. This scheme uses a model coefficients estimator based the theory of Variational Bayesian Inference. It reveals the unknown positions of transmitting CRs and the spectrum holes in authorized frequency bands, by capitalizing on the forms of sparsity...
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