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判决反馈自适应滤波应用于CDMA系统中的单频干扰抑制 总被引:1,自引:0,他引:1
针对扩频接收机中窄带干扰抑制中已有结构和算法的优缺点,提出一种在滤波器输入和权值修正中均利用判决值的判决反馈方案,并对常规、采用软判决和采用硬判决三种情况的单边预测型结构和常规最小均方误差(LMS)算法、可变步长LMS(VSS)算法和变步长变动量因子LMS(VSVMS)算法三种算法进行了计算机模拟。结果表明,此判决反馈方案对抑制单频干扰在性能上比已有结构有明显改进,且软判决比硬判决性能略优,算法以 相似文献
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提出一种三值滤波器输入和权值修正中均采用判决值的非线性判决反馈干扰抑制器,用于抑制CADM中的单频干扰。 相似文献
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语言是人类用来表达情感和交流思想的工具。在体育教学过程中,教师若能讲究语言的科学性和艺术性,既能使学生产生良好的心理定势和情感变化,又能激发学生的学习兴趣。本文通过对体育教师在体育教学过程中进行不同的讲解方式进行分析,进而阐明在体育教学中如何运动理论讲解使教学达到最佳效果。 相似文献
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针对斛算机文化基础》课程教学中的授课形式单调,授课内容不实用,不能激发学生的想象力,没有照顾到学生的个体学习差异以及不注重学习效果的调查反馈等问题,结合项目驱动教学理论,提出斛算机文化基础》课程的七步教学法,包括上好第一堂课,制定项目任务,学生尝试完成任务,教师重点讲解,学生二次尝试,一对一考核和效果反馈。实践证明,学生学习积极性提高了,不同进度学生的学习效果得到了保证,培养了学生一定的实践能力,效果良好。 相似文献
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古村落旅游地游客市场发展动力学研究——以西递、宏村为例 总被引:3,自引:0,他引:3
运用系统动力学构建了西递、宏村旅游地发展的系统动态模型,分析了西递、宏村游客市场结构,同时分析了模型建立下的西递、宏村近程观光市场和远程观光市场的发展机制反馈,并针对西递、宏村古村落目前旅游发展中存在的问题提出了调控对策和建议。 相似文献
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通过对教学环境的系统分析(自然环境、社会环境),发现在体育教学中,社会环境因素对体育教学质量、效果的影响以及相互关系。提出了科学掌握和利用教学环境,顺应社会环境的变化发展而自我完善,促进提高体育教学质量。 相似文献
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殷志栋 《中国环境管理干部学院学报》2001,(1)
全面推动素质教育,已成为我国21世纪体育教学改革的主要内容。体育美学作为体育教学的一个重要组成部分,在素质教育的改革大潮中应对体育教师提出什么样的要求呢?本文将从体育美学和中国传统哲学范畴——“形神论”的角度,对在体育教学中起主导作用的体育教师进行分析,进而阐明21世纪体育教师应具备什么样的素质。 相似文献
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Morris J Bailey AP Lawson CS Leeds-Harrison PB Alsop D Vivash R 《Journal of environmental management》2008,88(2):372-381
In many river floodplains in the UK, there has been a long history of flood defence, land reclamation and water regime management for farming. In recent years, however, changing European and national policies with respect to farming, environment and flood management are encouraging a re-appraisal of land use in rural areas. In particular, there is scope to develop, through the use of appropriate promotional mechanisms, washland areas, which will simultaneously accommodate winter inundation, support extensive farming methods, deliver environmental benefits, and do this in a way which can underpin the rural economy. This paper explores the likely economic impacts of the development of flood storage and washland creation. In doing so, consideration is given to feasibility of this type of development, the environmental implications for a variety of habitats and species, and the financial and institutional mechanisms required to achieve implementation. 相似文献
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A four-stage method of providing conditions for improving the stability of a landscape sector is presented. In the first stage,
structure and function of the landscape system is examined, predominantly based on the results of monitoring. In the second
stage, a method is suggested for applying monitoring data to a dynamic structure with complex functions of the territory under
examination. In the third stage, the territory is optimized as to the function of particular components within it. The optimization
consists in controlling the dynamics of the flows of material, energy, and population within the sector. In the fourth stage,
the holistic function of the landscape strip should be monitored with respect to representative key factors. The entire concept
is based on assuming the existence of destabilizing processes leading to ecocritical situations and determining mitigating
factors using heuristic methods of optimization. 相似文献
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Frederick Steiner 《Environmental management》1991,15(4):519-529
This article is the first in a series of three. These articles were prepared to document the growth management process undertaken
in Teller County, Colorado, USA. In this article, an 11-step method for landscape planning is proposed. In step 1, an issue,
or set of related issues, is identified as posing a problem and/or opportunity to people and/or the environment. In step 2,
a goal, or several goals, is established to address the problem or opportunity. In steps 3 and 4, inventories and analyses
of biophysical and sociocultural processes are conducted, first at the regional level and then at the local level. Step 5
involves detailed studies (such as suitability analyses) that link the inventory and analysis information to the problems
or opportunities and goals. Detailed studies link regional and local information to specific sites. Thus, this method involves
a regional-local-specific site hierarchy. In step 6, concepts are developed that lead to a landscape plan in step 7. During
step 8, the plan is explained through a systematic educational and citizen involvement effort to the affected public. In step
9, detailed designs are developed that again are explained to the specific individuals who will be impacted by the designs.
It is in step 10 when the plan and designs are implemented. Step 11 involves the administration of the plan. The method is
illustrated through an example of growth management planning for Teller County and the city of Woodland Park, Colorado.
Paper 1 in a series of 3. 相似文献
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为研究成都地区发生不同程度空气污染时,地面气象要素的搭配类型特征,基于成都地区2014~2016年多个逐日气象要素值(气温、气压、湿度等)和逐日AQI资料,对2014~2016年成都地区空气质量状况进行特征分析,并且通过TSI天气分型方法,并结合同期逐日空气质量资料探讨了四季不同天气类型下空气质量特征,主要结果为:(1)2014~2016年成都市总体空气质量夏秋季空气质量最佳,春季次之,冬季最差。(2)不同天气类型空气质量状况差异较大。春季3型和4型容易发生轻度污染;夏季1型和4型容易发生轻度污染;秋季3型容易出现轻度污染;冬季4型和5型天气下容易发生轻度污染以上的空气污染状况。研究为成都地区空气污染气象研究提供参考依据,也为空气污染预报提供一些借鉴意义。 相似文献
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In 1995 the authors spent a considerable amount of time conducting audits and audit training classes all over the world. In rolling out Colgate-Palmolive's reengineered environmental audit program, they coupled a two-day training program with a three-day audit. Whether in Asia-Pacific, South America, Europe, or the United States, auditors, especially those newly trained, always seemed to fall into the same traps time and again. In order to facilitate the learning process, the authors prepared a list of 20 tips to use at the beginning and end of all training programs and audits. In this article, the authors share the 20 “golden rules” to help all auditors improve the quality of their audits. 相似文献
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Anna Höglhammer Andreas Muhar Patricia Stokowski Thomas Schauppenlehner Renate Eder 《Local Environment》2018,23(8):814-829
Urban public spaces are important areas for leisure, recreation and physical activity and therefore contribute to the quality of life in cities. In particular, for adolescents they provide important spaces to meet with their peers, away from parental or school control. In many cities worldwide, public spaces have undergone severe developmental processes, and often a withdrawal from public space is noted. With regard to the opportunities those spaces provide for adolescents, it is necessary to investigate their current meaning for adolescents in a leisure context. In this article, qualitative research methods were used to investigate factors affecting adolescents’ use of public spaces in Vienna, Austria. In total 45 adolescents were interviewed. Results show that public open spaces are not regarded as important leisure spaces, and data reveal a strong retreat to private areas for leisure purposes. Perceived insecurities and fears support these processes and often result in avoidance of public spaces but also the wish for more control by authorities. 相似文献
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Biogas production from anaerobic digestion has increased rapidly in the last years, in many parts of the world, mainly due to its local scale disposition and to its potential on greenhouse gases (GHG) emissions mitigation. Biogas can be used as fuel for combined heat and power systems (CHP), in particular for internal combustion engines (ICEs). In recent investigations, fuel cells have been considered as alternative CHP systems. In the present article, two different energy conversion systems are compared: a 1.4 MW class MCFC system, running on pipeline natural gas, and an in situ ICE, running on biogas. In the first case, biogas is considered as a source fuel to obtain upgraded gas to be injected in the natural gas grid. In such scenario, the location of the fuel cell power plant is no longer strictly connected to the anaerobic digester site. Several energy balances are evaluated, considering different upgrading techniques and different biogas methane/carbon dioxide ratios. 相似文献