Hou Xingzhe

Simulation Study Low Voltage Power Line Carrier Communication in Noisy Environments

Studies have shown that there are a lot of low-voltage power line is one of the main obstacles to strong noise limit for data transmission quality. Power line noise can be divided into steady background noise, narrowband interference noise, sudden impulse noise and periodic noise. Background noise is distributed throughout the communication band, low-voltage power line up white Gaussian noise 22dB [133 or more. Sudden noise is generated by the random access or disconnect electrical equipment produced. Studies have shown that pulse interference effects on the quality of the low voltage power line carrier communication maximum. Literature statistics, intensity pulsed interference up 40dBuv.

Research on Low Voltage Power Line Carrier Communication Simulation Software

The use of semi-physical simulation platform for school laboratory and classroom building scene a lot of field measurements, analysis of power line channel transmission characteristics of the different environments, and features a three-dimensional graphic display of variable power line channel under different scenarios. At the same time in order to improve the efficiency of the data analysis, the use of MATLAB simulation software design based on off-line data analysis software GUI interface. It receiving end signal processing module integrated into the GUI interface, to implement graphical data analysis and processing, and at the same time from multiple dimensions of the channel parameters display.

Modeling of High-Frequency Low Voltage Power Line Carrier Communication Channel

Low-voltage power line channel characteristics are designed for low voltage power line carrier communication system foundation. The paper used to design and develop a system for measuring the electrical characteristics of the low voltage power line communication network used to do high, including the noise characteristics of the input impedance characteristics, signal attenuation characteristics and systems, etc., a lot of experimental research. On this basis, the establishment of a low-voltage power grid will be used as a high-frequency carrier communication channel model. The model provides a practical and effective platform for the research and design of low voltage power line carrier communication system network has laid a good foundation.

Research on Low Voltage Power Line Carrier Communication Test Environment

Low voltage power line carrier communication simulation software and simulation test system is analog carrier communication channel environment in different ways, the two systems complement each other, the former design stage for communications equipment, flexible and comprehensive simulation of the channel complex transmission characteristics; the latter stages of a communication device for debugging, you can be more effective and intuitive reflect any change in the characteristics of the load. This paper describes the combination of the two respective characteristics of its ability to effectively simulate the actual channel transmission characteristics.

Adaptive subcarriers grouping algorithm for SC-FDMA systems

A new adaptive subcarrier grouping scheme is proposed to maximize capacity of single-carrier FDMA (SC-FDMA) system. In OFDM system, the SNR of each subcarrier is dependent on the frequency selective channel fading. While in SC-FDMA system, the SNR of each symbol is of the same value. Theoretical analysis shows that the SNR of the received SC-FDMA symbol is dominated by some few deepest fading subcarriers. With the sacrifice of not using these subcarriers, the whole system performance can be significantly improved. This characteristic inspires us to propose a new algorithm to maximize overall system capacity. Different from the conventional adaptive power allocation method, we only need to decide whether to use some of the deepest fading subcarrier by our proposed adaptive grouping algorithm, and indicate grouping decision to the receiver. Simulation results show that the capacity improved by our method compared with the conventional SC-FDMA system. The average grouping information is very small, and the indication overhead is negligible compared with the whole system capacity. The PAPR is increased slightly. Our method provides a flexible tradeoff between the system performance and PAPR.

Full-wave analysis of non-radiative wireless power transmission system in half space

This article studies the property of wireless power transmission (WPT) system by electromagnetic full-wave simulation method when half-space condition is considered. Specially, the Time Domain Integral Equation (TDIE) is applied in this simulation. With this time domain method, the WPT without the ground is analyzed and compared with the traditional method, which has demonstrated the validity and high efficiency of this simulation method. After that, TDIE is applied to analysis the impact of infinite ground to the performance of WPT system which is a common situation when the WPT system is applied. The simulation results demonstrate that the ground will increase the resonant frequency and decrease the efficiency seriously. Besides, the ground will also bring along the split of resonant frequency in the traditional under coupled area.

Adaptive frequency reuse in two-hop cellular system with fixed relay nodes

In this paper we investigate dynamic frequency reuse scheme for cellular system enhanced with two-hop fixed relay station (RS). Frequency reuse can increase spectrum efficiency. However, it will also introduce more interference. In order to reuse more frequency resources with satisfactory quality of service (QOS), we propose an adaptive frequency reuse scheme according to the desired interference level. Both inter-cell and intra-cell reuse are considered. No interference measurement is needed, the signaling overhead is reduced. Numerical results show that in our proposed scheme the signal to interference ratio (SIR) performance on the cell edge is improved significantly, the spectrum efficiency is also increased.