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In order to assess the influence of electromagnetic interference in the substation of the electric power communication system, frequency measurement method is adopted to obtain the data of 430 MHz, 470 MHz and 2.4GHz electromagnetic wave path loss of the substation of 110 kV and 220 kV in a certain city. By using the method of Minimum Mean Square Error (MMSE) and Cumulative Sum (CUSUM) to estimate...
In this paper, a sub-optimal log probability ratio is proposed as soft decision information for the Viterbi decoding in OFDM based PLC system with differentially modulated QPSK, which requires average noise power on each subcarrier. A simple method to determine average noise power is described. Potential narrow band interferer, which may negatively affect the quality of the soft decision information,...
Narrowband interference (NBI) is a major concern that constrains the performance and development of wireless local area network (WLAN) systems. Compressed sensing (CS) is a new and powerful signal processing technique that is applied to solve this problem in this paper. In the framework of structured CS (SCS), we investigated the multiple input multiple output (MIMO) WLAN system, and proposed a novel...
In massive multiple-input multiple-output (MIMO) systems, the number of base station (BS) antennas could reach tens or even hundreds, therefore the hardware cost of adopting conventional signal detectors can be unaffordable due to their high complexity which increases quickly with the number of the transceiver antennas. To solve this problem, this paper proposes a low-complex iterative detector based...
In this paper, a robust timing and frequency synchronization method in the presence of narrowband interference is proposed for 230MHz electricity communication system. A narrowband interference detection module and an adaptive filter are applied in the synchronization approach. The former one is to find the narrowband disturbance that has larger power and provide information to configure the adaptive...
In this paper, an optimized time-frequency interleaving scheme is proposed to combat against the narrowband interference (NBI) and time-domain impulsive noise (TIN) for orthogonal frequency division multiplexing (OFDM) systems in power line communications (PLC). To improve both the anti-NBI and anti-TIN performance, we propose two criteria based on which the optimized interleaving scheme is designed:...
Cleaning process is the key stage affecting the final concentrate grade of mineral flotation. The operation parameters are normally adjusted manually by operators to achieve the optimal control of the concentrate grade. However, this method is of great subjectivity, randomness and uncertainty. Therefore, an intelligent predictive control method for the cleaning process based on the froth texture features...
Power Line Communication (PLC) plays a major role in smart grid applications. However, when the frequencies of above 500 kHz are used, mutual interferences between the PLC access system and Medium Wave (MW)/Short Wave (SW) broadcast radios may occur. To cope with this issue, one of the promising solutions is cognitive PLC. In this paper, MW/SW broadcast radio frequency allocation and their usage conditions...
The paper deals with narrow band power line channel for low voltage access network in China. Major channel characteristics such as access impedances, interferences, and attenuations for frequency between 30–500 kHz are evaluated based on measurements results in a typical urban underground network. Coupling mode has a significant impact on the performance of narrow band power line communication. Comparison...
As power industry enters the new century, powerful driving forces, uncertainties and new functions are compelling electric utilities to make dramatic changes in their information communication infrastructure. Optical networks no doubt will become the predominant data transmission media for next generation power system communication. Based on advanced fiber optic technologies, an optic-based Information...
The purpose of this project was to develop diffusion weighted periodically rotated overlapping parallel lines with enhanced reconstruction (DW-PROPELLER) on low-field open MR systems. The DW-PROPELLER was implemented on a 0.35T open MR system, and an auto pre-scan technique was used to mitigate non-Carr-Purcell-Meiboom-Gill (CPMG) artifacts. High quality diffusion weighted images and associated ADC...
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