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Advanced Communication System in Substation for Integrated Protection
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作者 和敬涵 任颖莉 +1 位作者 薄志谦 Klimek Adrew 《Transactions of Tianjin University》 EI CAS 2008年第2期128-133,共6页
This paper proposes an advanced substation integrated protection communication system based on the latest development in power system.The integrated protection communication system within a substation comprises a numb... This paper proposes an advanced substation integrated protection communication system based on the latest development in power system.The integrated protection communication system within a substation comprises a number of major components such as the merging unit, communication network and integrated protection unit.The design and capability evaluation of the communication network based on IEC61850 are focused on.Results show that huge information from 4 merging units can be transmitted real-time via adopting 100 Mbit/s optical fiber in a substation,and the proposed communication network is able to achieve required performance. 展开更多
关键词 IEC61850 communication scheme SUBSTATION integrated protection
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Small-Signal Analysis of Performance Characterization of Chaotic Masking Decoding in Injected Semiconductor Lasers 被引量:1
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作者 颜森林 《Chinese Physics Letters》 SCIE CAS CSCD 2005年第10期2504-2507,共4页
Performance characterization of chaotic masking encoding and decoding is studied in synchronization injected semiconductor lasers under condition of injected-feedback. The modulation response function of chaotic maski... Performance characterization of chaotic masking encoding and decoding is studied in synchronization injected semiconductor lasers under condition of injected-feedback. The modulation response function of chaotic masking encoding and its response factor are theoretically deduced and analysed by small-signal analysis. It is numerically demonstrated that there are peak values between 1.52 GHz and 3.18 GHz when the injection coefficient is between 0.2 and 0.8. The chaotic synchronization error equation is theoretically deduced and its root is given by small- signal analysis under condition of chaotic masking encoding. The chaotic decoding formula is also theoretically demonstrated. There are the least dale values of synchronization errors between the modulation frequencies of 0.79GHz and 1.91 GHz when the injection coefficient is between 0.1 and 0.8 in numerical simulation. The numerical result is well consistent with the theoretical demonstration. 展开更多
关键词 communication scheme SYNCHRONIZATION SYSTEMS MODEL
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Chaotic Synchronization of the Master Slave Chaotic Systems with Different Structures Based on BANG-BANG Control Principle 被引量:1
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作者 王建根 赵怡 《Chinese Physics Letters》 SCIE CAS CSCD 2005年第10期2508-2510,共3页
We propose a Bang-Bang control scheme that can synchronize master-slave chaotic systems. The chaotic systems considered here are structurally different from each other. Different from some control strategies reported ... We propose a Bang-Bang control scheme that can synchronize master-slave chaotic systems. The chaotic systems considered here are structurally different from each other. Different from some control strategies reported previously, the scheme proposed here can be taken as a general one that is independent of the chaotic system itself. 展开更多
关键词 SLIDING MODE CONTROL communication scheme
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SIMO detection schemes for underwater optical wireless communication under turbulence 被引量:18
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作者 Weihao Liu Zhengyuan Xu Liuqing Yang 《Photonics Research》 SCIE EI 2015年第3期48-53,共6页
In underwater optical wireless communication(UOWC),a channel is characterized by abundant scattering/absorption effects and optical turbulence.Most previous studies on UOWC have been limited to scattering/absorption e... In underwater optical wireless communication(UOWC),a channel is characterized by abundant scattering/absorption effects and optical turbulence.Most previous studies on UOWC have been limited to scattering/absorption effects.However,experiments in the literature indicate that underwater optical turbulence(UOT)can cause severe degradation of UOWC performance.In this paper,we characterize an UOWC channel with both scattering/absorption and UOT taken into consideration,and a spatial diversity receiver scheme,say a singleinput–multiple-output(SIMO) scheme,based on a light-emitting-diode(LED) source and multiple detectors is proposed to mitigate deep fading.The Monte Carlo based statistical simulation method is introduced to evaluate the bit-error-rate performance of the system.It is shown that spatial diversity can effectively reduce channel fading and remarkably extend communication range. 展开更多
关键词 SIMO detection schemes for underwater optical wireless communication under turbulence THAN
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Log Likelihood Ratio-Based Relaying for Distributed Turbo Codes
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作者 Peiyao Yang Hai Li Shujuan Hou 《Journal of Beijing Institute of Technology》 EI CAS 2018年第2期176-181,共6页
A distributed turbo codes( DTC) scheme with log likelihood ratio( LLR)-based threshold at the relay for a two-hop relay networks is proposed. Different from traditional DTC schemes,the retransmission scheme at the... A distributed turbo codes( DTC) scheme with log likelihood ratio( LLR)-based threshold at the relay for a two-hop relay networks is proposed. Different from traditional DTC schemes,the retransmission scheme at the relay,where imperfect decoding occurs,is considered in the proposed scheme. By employing a LLR-based threshold at the relay in the proposed scheme,the reliability of decoder-LLRs can be measured. As a result,only reliable symbols will be forwarded to the destination and a maximum ratio combiner( MRC) is used to combine signals received from both the source and the relay. In order to obtain the optimal threshold at the relay,an equivalent model of decoderLLRs is investigated,so as to derive the expression of the bit error probability( BEP) of the proposed scheme under binary phase shift keying( BPSK) modulation. Simulation results demonstrate that the proposed scheme can effectively mitigate error propagation at the relay and also outperforms other existing methods. 展开更多
关键词 cooperative communication relaying scheme distributed turbo codes log likelihood ratio(LLR)
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