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1.
针对常规解相关多用户检测算法因对相关矩阵求逆的运算量随用户数增加呈指数增加而失去了实用价值,提出了不需对相关阵求逆的计算复杂度低的快速QR解相关多用户检测算法。该快速算法运算量与常规解相关算法相比,运算量减少了70%,而检测性能丝毫没有降低。显然,该算法优于常规算法,具有实用意义。  相似文献   

2.
码分多址(CDMA)技术已被广泛应用到多用户通信系统中。本文主要介绍CDMA多用户通信系统所采用的各种信号检测技术,并着重阐述了多用户信号分离技术及其研究进展。  相似文献   

3.
Linux是一款免费的操作系统,完全兼容POSIX1.0标准,支持多用户、多任务处理,同时支持字符界面和图形界面操作,具有丰富的网络功能、可靠性安全、稳定性能强、实时性优良、软硬件可裁剪、移植性能强等优点。TCP协议一IOS七层网络模型中传输层控制协议。它是面向连接的可靠的字节流传输协议,此协议具有传输数据的可靠性、安全性强等优点。本设计在Linux基础上该系统采用c/s构架,实现多用户,单服务器的多进程间通信,从而实现远程数据传输的功能。  相似文献   

4.
本文讨论了GPS干扰源抑制中的多用户检测技术。多用户检测技术将GPS信号中的窄带数字干扰作为多用户信号进行检测,从而在多个干扰源中提取出GPS卫星信号。文中首先给出了CDMA系统中的多用户信号模型,然后具体介绍了3种多用户检测器,并分析了它们的信号干扰比和比特误码率。  相似文献   

5.
本文基于DS-CDMA系统中的线性多用户检测提出了码变换、离散码变换的概念,主要阐述码/时域滤波的基本原理,指出线性多用户检测是一种码/时域滤波,但是有关码变换阵的研究有待深入。  相似文献   

6.
时分多址(Time Division Multiple Access,TDMA)信号用户分离作为TDMA信号第三方侦收的重要环节,是后续用户内涵信息解译组报、目标测向定位的前提条件。在未知网台规格情况下,无法通过解译用户ID或网控信令的方式对多用户进行分离。基于TDMA信号物理层特征,提出了一种基于DBSCAN(Ddensity-based Spatial Clustering of Applications with Noise)聚类算法的TDMA信号用户盲分离方法。通过对TDMA信号的时频域特征进行提取和聚类,实现对多用户突发时隙进行分离,并利用仿真数据和实际网台数据进行了算法验证。该算法具有良好的抗噪声性能和较高的正确分选率。  相似文献   

7.
信令连接控制部分(SCCP)面向连接业务的最主要特点是在传递数据之前的连接建立阶段就完成了路由选择,因而如何解决路由控制和多用户识别问题是实现该业务的关键。通过对协议的深入分析及实际应用的考虑,设计出路由控制流程和多用户连接段表,从而很好地解决了上述问题,并由测试结果对SCCP面向连接业务进行了性能评估。  相似文献   

8.
针对码分多址接入(CDMA)系统中最优多用户检测的指数计算复杂度问题,结合CDMA通信的实际特点,利用进化规划免去了交叉操作因而计算复杂度小的特点,提出了一种基于进化规划的多用户检测问题的优化处理方法。实验结果表明本方法可获得接近最佳检测的性能,但计算复杂度降低。  相似文献   

9.
针对突发地质灾难中无法利用常规通信网络通信的问题,提出一种基于于嵌入式微处 理器OMAP5912 的实时多用户通信方案。采用WiFi无线网卡组建Ad Hoc网络,通过AIC23芯 片实现语音采集和输出,利用动态多用户语音解码算法实现实时多用户话音通话功能。测试 表明,该系统支持多用户同时语音通信功能,语音延迟约60 ms,适合于各种应急通信 等无线应用场合。  相似文献   

10.
为了抑制空时分组编码系统中的共道用户多址干扰,对低复杂度的多用户检测算法进行了研究,提出了基于概率数据辅助(Probabilistic Data Association,PDA)算法的大容量多用户检测技术。通过充分利用干扰信号的相关性进行有效干扰抑制,从增加共道用户的角度来提高系统容量。仿真表明,该检测技术能进一步提高系统性能,尤其是增大了通信系统容量。  相似文献   

11.
严敬 《科技转让集锦》2011,(23):185-185
工程概预算是确定建筑产品价格的重要方法,是编制基本建设计划的依据,是选择评价设计方案优劣的重要尺度,是控制投资额和办理拨款的依据,是签订承包合同,推行招标投标的基础,加强施工管理和贯彻经济核算的必备条件,工程概预算的指标和费用分类是确定统计指标和会计科目的重要依据。  相似文献   

12.
刑法司法解释的溯及力,应当一律按照新的司法解释,还是按照从旧兼从轻原则,这是司法实践中的难题。现有的规定对这一问题的立场本身也是矛盾的。司法解释的性质所呈现的理想与现实的错位,造成了刑法司法解释溯及力问题的困境。从应然与实然两个层面解决这种困境是较好的方案。一方面应当规范司法解释的内容,另一方面,当刑法司法解释属于刑法条文可能含义之内时,应当直接适用司法解释,而当其突破刑法条文可能含义时,为了维护罪刑法定原则,则应当遵循从旧兼从轻原则。  相似文献   

13.
在设计FIR滤波器时,往往会指定过渡带大小,但过渡带的引入只是为了便于滤波器的设计,而并不是物理上的需要,所以在设计中仅需指定截至频率。这是第一个设计理念。此外,在FIR滤波器的设计中存在两种准则:一是等波纹设计准则 (即最大误差最小化或者Chebyshev准则 ),另一种是平方误差最小准则。但在现实中两种准则往往要同时兼顾,所以仅基于其中一种准则来设计不能得到最佳结果。这是第二个设计理念。基于上述两种设计理念,提出了一种新的FIR滤波器设计算法。该算法采用最陡梯度下降法来对平方误差最小化下的最佳滤波器系数进行迭代修正,得到最佳结果。  相似文献   

14.
介绍了一种宽频带双极化低副瓣天线的设计、加工方法和测试结果。采用馈源偏置的方法来减小副瓣,采用波纹喇叭实现天线双极化的要求,并且采用双椭圆切割抛物面来增加天线的效率和减小方位主波束宽度。天线的理论分析与实验结果吻合较好,优于所需的技术指标要求。  相似文献   

15.
预应力混凝土管桩作为一种成熟的桩基础形式已越来越被大家所接受,其以施工速度快、长度易调整、质量较可靠、造价较合理、易于检测、现场清洁等优点,被广泛地应用于工业与民用建筑中。本文结合实际工程,探讨预应力混凝土管桩在不良地质条件下的设计与施工。  相似文献   

16.
This article is the final one in a series of four papers investigating the stakeholder approach to running businesses. It argues that the optimally viable version of that approach is one in which employees have a co-equal status as stakeholders with shareholders (the maximum allowed for under stakeholder theory) while other groupings only have a minimal status as stakeholders and are generally restricted to just customers, suppliers, and lenders. This version is argued for on the grounds that it both overcomes the implementation problems attendant upon having to serve the interests of a range of groupings and is justified in terms of stakeholder membership being confined to those groupings with a claim on the services of a business in virtue of directly contributing to its economic functioning. The ranking of non-shareholder stakeholders in the recommended version and, in particular, the maximal ranking granted to employees is argued to reflect the scale of the various contributions as measured by the degree to which making it exposes those stakeholders to both financial risk and a non-financial “work-related” risk peculiar to employees. It is concluded that although this is the best available version of the stakeholder approach it may not be the best of all possible ways of running a business. John Kaler is a Visiting Research Fellow at the University of Plymouth Business School. He is the co-author of the books An Introduction to Business Ethics and Essentials of Business Ethics, and was co-editor for Teaching Business Ethics, a website hosted by the Institute of Business Ethics. He is an ex-member of the Executive Committee of the European Business Ethics, U.K., and has published on a wide range of business ethics topics.  相似文献   

17.
周军宜 《北方经贸》2002,(1):100-103
自我评价是一种诊断性评价 ,对于企业的持续改进和市场竞争力的提升具有非常重要的作用。模型的建立是任何类型评价进行的重要前提。因此 ,应建立一种自我评价模型 ,并从企业系统的各个方面对模型进行详细的说明 ,然后总结其主要特征。  相似文献   

18.
网络交易市场的不断增长,第三方支付方式的使用日益广泛,第三方支付机构所管理的客户备付金也不断增多。法理上,第三方支付机构客户备付金及其孳息的所有权应该由第三方支付机构的客户所享有;实际上,第三方支付机构客户备付金的孳息难以分配给其所有者。设立一个第三方机构代表第三方支付机构客户行使所有权,并完善相关立法,不失为解决这一问题的最好的途径。  相似文献   

19.
The decision making process is an important aspect of the managerial function that is becoming increasingly complex due to technological and global impacts. It is essential, therefore, to understand why various managers approach the decision making process differently. One area that is related to how managers perceive and process the information that is associated with decision making, is that of decision style.It is not enough, however, to explore decision style in isolation, as some of the decisions that managers make often entail ethical components concerning the ability to balance the interests of diverse groups. Moral reasoning is therefore important for every manager, and could impact the decision style that is employed by such managers. The relationship between managerial decision style and moral development is one that could provide unique insights into the area of decision making, yet it is an area that has remained relatively unexplored.Using Alan Rowe's Decision Style Inventory (DSI), in conjunction with James Rest's Defining Issues Test (DIT), the purpose of this study was to ascertain the relationship between decision style and moral development among U.S. managers.The findings of this study of 270 managers suggest that there is a relationship between higher directive decision style scores and lower principled reasoning scores. Since the focus of individuals who demonstrate a directive decision style is on task completion, perhaps the consideration of the many alternatives that are necessary to reason at a more ethically attuned level is neglected. Managers who exhibit a directive decision style might be responsible for the management of non-managerial populations of workers, and in such a capacity, set the ethical tones and examples for employees to follow. Since training and educational interventions in the area of ethics have been shown to increase moral development scores, those managers who are identified as displaying a directive decision style might benefit from such training.  相似文献   

20.
针对室内定位技术部署复杂、成本高的问题,提出了一种利用手机接收声学信号通过脉冲压缩进行室内定位的方法。通过借鉴雷达系统中的脉冲压缩技术,将信号和噪声分离,并提取出信号到达时延估计。为了减小定位误差,研究了手机的声学特性,设计了声学超宽带信号的信道模型,将应答节点时延回传,进一步减小信号传播的时延估计。在停车场的试验结果表明:定位结果和实际位置相符,平均定位误差在30 cm以内。  相似文献   

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