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量化位数对导航直扩接收机相关处理的影响研究 被引量:1
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作者 胡海娜 张颂 《遥测遥控》 2009年第4期40-44,共5页
A/D转换是直扩数字接收机设计的关键技术之一,文中主要考虑量化比特数的选取,分析不同量化位数对相关峰信噪比、载波跟踪误差和码跟踪误差的影响,在高斯白噪声的条件下给出了系统信噪比的计算公式和定量分析结果。理论分析和实际测试结... A/D转换是直扩数字接收机设计的关键技术之一,文中主要考虑量化比特数的选取,分析不同量化位数对相关峰信噪比、载波跟踪误差和码跟踪误差的影响,在高斯白噪声的条件下给出了系统信噪比的计算公式和定量分析结果。理论分析和实际测试结果表明:采用较低的转换位数不会急剧恶化含有高斯噪声的扩频信号的信噪比,采用4bit量化,可获得较好的接收机性能,量化位数对直扩信号检测的影响是有限的。 展开更多
关键词 ad量化 直扩接收机 相关处理
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A Novel Real-time Optimization Methodology for Chemical Plants 被引量:1
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作者 黄静雯 李宏光 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第6期1059-1066,共8页
In this paper, a novel approach termed process goose queue (PGQ) is suggested to deal with real-time optimization (RTO) of chemical plants. Taking advantage of the ad-hoc structure of PGQ which imitates biologic natur... In this paper, a novel approach termed process goose queue (PGQ) is suggested to deal with real-time optimization (RTO) of chemical plants. Taking advantage of the ad-hoc structure of PGQ which imitates biologic nature of flying wild geese, a chemical plant optimization problem can be re-formulated as a combination of a multi-layer PGQ and a PGQ-Objective according to the relationship among process variables involved in the objective and constraints. Subsequently, chemical plant RTO solutions are converted into coordination issues among PGQs which could be dealt with in a novel way. Accordingly, theoretical definitions, adjustment rule and implementing procedures associated with the approach are explicitly introduced together with corresponding enabling algorithms. Finally, an exemplary chemical plant is employed to demonstrate the feasibility and validity of the contribution. 展开更多
关键词 real-time optimization chemical plants process goose queue multi-layer process goose queue
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