Wang Zhenyong

Bio: Wang Zhenyong is an academic researcher from Harbin Institute of Technology. The author has contributed to research in topics: Satellite constellation & Decoding methods. The author has an hindex of 3, co-authored 9 publications receiving 17 citations.

Hierarchical Satellite Network Design Based on Permanent Inter-Satellite-Links

Abstract: Based on analysis of permanent inter-satellite-links, a hierarchical satellite network is designed to solve the problem of continual handoff caused by relative movements of satellites in different orbits. According to geometrical characteristics of satellite networks, conditions to establish permanent inter-satellite-links are proposed. With conditions of permanent inter-satellite-links, constellations of the hierarchical satellite network are designed. By simulations on performances of azimuth, elevation and range between satellites in different orbits, stability of the hierarchical satellite network is verified.

A Random Number Generator Based Software Channel Simulator for Land Mobile Satellite Channel

Abstract: A two-state statistical channel model is proposed for predicting the propagation characteristics of land mobile satellite channel (LMSC) according to propagation scattering theory. The underlying channel model takes for granted non- frequency-selective fading but considers the effects caused by shadowing. For such a channel model, a software channel simulator is designed. The simulator is based on a random number generator (RNG) that generates data sets to compute fading statistics of the propagation channels. Compared with the filter method and the Rice method, the RNG method can be realized precisely in engineering. Furthermore, the operating frequency band of the simulator is not restricted to any particular frequency band, for the random numbers used in the simulator are independent of frequency. The validity of the simulator is confirmed by comparing fading statistics from the analytical model and the measured data.

A novel multi-dimensional constellation design method based on lattices for sparse code multiple access

Abstract: Sparse Code Multiple Access (SCMA), as a new non-orthogonal multiple access scheme, achieves the good performance to access to massive information. Shaping gain of a multi-dimensional constellation is the main source of the performance improvement. However, when the number of constellation points is large, the process of the constellation design is too complex. In this paper, a novel multidimensional constellation design method based on lattices is proposed. The constellation with spherical boundary, which has the largest shaping gain, is designed and correspondingly a simplified optimization algorithm is proposed. We present the capacity of the constrained constellation on the AWGN channel. Experimental results show that the proposed constellation design method reduces the average transmit power. In addition, compared to orthogonal frequency division multiple access (OFDMA), the performance of the system is improved.

Load Balancing and QoS Provisioning Based on Congestion Prediction for GEO/LEO Hybrid Satellite Networks

Abstract: While GEostationary Orbit (GEO) satellite systems provide us with a wide coverage area, their long delay serves as a significant constraint for real-time applications. On the other hand, Low Earth Orbit (LEO) satellite systems are best suited to delay sensitive applications. However, the coverage and mobility issues of LEO satellites lead to relatively high management costs. In this paper, we devise a new load balancing and quality of service (QoS) provisioning scheme to accommodate both real-time and non-real-time traffic based on a new congestion-prediction scheme. The effect of this new scheme is expected to improve the efficiency of the GEO/LEO hybrid satellite networks and the QoS satisfaction of end users.

Systems engineering of inter-satellite communications for distributed systems of small satellites

Abstract: Present design processes for satellite networks mainly involve interconnected system models and their parameter-based simulations without emphasizing high level requirements in the process. What is missing is a systems engineering approach and a system of verification and validation based on formal representation and analysis. We propose a systems design methodology for inter-satellite communication based on the Responsive and Formal Design (RFD) [1]–[3], which addresses the need for a model-based system engineering approach coupled with a system of validation and verification based on formal representation and analysis. The goal is to apply the RFD process to provide a solution for the Inter-Satellite Communications (ISC) problem within the Open Systems Interconnection (OSI) framework. The OSI represents a standard framework for communication between devices. It divides the communication process into seven layers, with each one providing well-defined functions and services. We will address the integration of the RFD process with the OSI framework for ISC. The RFD process involves levels of design abstraction and refinement which correspond to layers or groups of layers of the OSI model. The process illustrates how the complete framework for ISC unfolds in an iterative manner.

Sound Source Omnidirectional Positioning Calibration Method Based on Microphone Observation Angle

Abstract: To get source azimuth from microphone observation angle of view in a complex real environment, this article, on the basis of the analysis of geometric positioning method, established a seven-element microphone array model and proposed a sound source omnidirectional positioning calibration method based on microphone observation angle. By using a seven-element array to invert the position and angle of a sound source, the relative time delay value of a pair of microphones on the vertical axis of the coordinate system is used to determine the elevation angle polarity and realize the omnidirectional sound source positioning. The array parameters, sound velocity, array size, horizontal deflection angle, elevation angle, and sound source are analyzed, and the error method is proposed. The sound source data was measured using the microphone array perspective, and a new Cartesian coordinate system was established based on the observation angle of view for omnidirectional positioning calibration of the sound source. The simulation results show that the position error of the method is about 0.01% and the angle error is about 0.005%, with high calibration accuracy. The actual measurement results show that this method can effectively calibrate the sound source azimuth, the error rate of the source coordinates is around 10%, the horizontal declination angle error is less than 5%, and the elevation angle error is less than 8%. Appropriately increasing the spacing of the array will have a better calibration effect in an actual complex experimental environment.

On effectiveness of routing algorithms for satellite communication networks

Abstract: For worldwide, a satellite communication network is an integral component of the global networking infrastructure. In this paper, we focus on developing effective routing techniques that consider both user preferences and network dynamic conditions. In particular, we develop a weighted-based route selection scheme for the core satellite communication network. Unlike the shortest path routing scheme, our scheme chooses the route from multiple matched entries based on the assigned weights that reflect the dynamic condition of networks. We also discuss how to derive the optimal weights for route assignment. To further meet user’s preference, we implement the multiple path routing scheme to achieve the high rate of data transmission and the preemption based routing scheme to guarantee the data transmission for high priority users. Through extensive simulation studies, our data validates the effectiveness of our proposed routing schemes.

Error Analysis for RADAR Neighbor Matching Localization in Linear Logarithmic Strength Varying Wi-Fi Environment

Abstract: This paper studies the statistical errors for the fingerprint-based RADAR neighbor matching localization with the linearly calibrated reference points (RPs) in logarithmic received signal strength (RSS) varying Wi-Fi environment. To the best of our knowledge, little comprehensive analysis work has appeared on the error performance of neighbor matching localization with respect to the deployment of RPs. However, in order to achieve the efficient and reliable location-based services (LBSs) as well as the ubiquitous context-awareness in Wi-Fi environment, much attention has to be paid to the highly accurate and cost-efficient localization systems. To this end, the statistical errors by the widely used neighbor matching localization are significantly discussed in this paper to examine the inherent mathematical relations between the localization errors and the locations of RPs by using a basic linear logarithmic strength varying model. Furthermore, based on the mathematical demonstrations and some testing results, the closed-form solutions to the statistical errors by RADAR neighbor matching localization can be an effective tool to explore alternative deployment of fingerprint-based neighbor matching localization systems in the future.