助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   恒参 的翻译结果: 查询用时:0.219秒
图标索引 在分类学科中查询
所有学科
更多类别查询

图标索引 历史查询
 

恒参
相关语句
  invariable parameter
     We simulate the performance of CDMA multiple orthogonal Signal modulation system in the condition of one path invariable parameter channel, multi path variable parameter channel with and without Rake receiver, the results of multi address improvement performance were got respectively.
     在单径恒参信道、多径变参信道及Rake接收的情况下,对多进制伪码正交调制系统的码分多址(CDMA)性能进行仿真,得到了多址性能改善的结果.
短句来源
  “恒参”译为未确定词的双语例句
     The recognition of frequency-modulated signal by parameter invariant filter
     频率调制信号的恒参滤波识别方法
短句来源
     The main working contents of this paper is following:1 According to the theory of electromagnetic induction law, a new radio induction system is proposed based on the traditional radio induction technology, analyzed on its signal transmission character and its frequency spectrum character.
     1 在现有的无线感应技术基础上,基于电磁感应理论,提出了新型无线感应系统,分析了新型无线感应系统的信号传输特性,分析了新型无线感应系统的频谱特性,把新型无线感应系统组成的信道和恒参信道、变参信道进行了比较,研究了新型无线感应系统在变流器供电中的应用。
短句来源
     In this paper, the system model for multi user asynchronous DS/CDMA under multi path fading channel is presented firstly. Then the Maximum Likelihood Sequential Estimation (MLSE) algorithm under time invariant channel is described in a new form which is different from Verdu's work.
     本文首先给出了多径异步多用户DS/CDMA系统的一种数学模型,得出了恒参信道下最大似然检测(MLSE)算法的一种新的表示形式。
短句来源
     If the time delay spread is within one information bit, the MLSE algorithms under multipath fading channel has the same complexity as that under time invariant channel, and the algorithms can be implemented by Dynamic Programming Algorithms with various state number.
     分析指出,在多径环境下MLSE算法的复杂度和计算量与多径时延的分布有关,如果用户时延扩散在一个信息码元之内,算法复杂度和恒参信道下相同,而其实现可以用状态数可变的Viterbi算法来实现。
短句来源
     To classify the frequency modulated signals, a parameter invariant filter was proposed. It can transfer the signal frequency modulated information to the variety of envelope and extract the histogram feature to classify the modulation types.
     针对频率调制信号的识别 ,提出采用恒参滤波方法 ,将信号频率调制信息转换为信号包络的变化 ,再通过提取信号包络的直方图特征来识别信号调制方式 .
短句来源
更多       
  相似匹配句对
     ,10refs.
     10。
短句来源
     10refs.
     10 .
短句来源
     Research to the Technology of Constant Pressure Water Supply
     压供水技术研究
短句来源
     The Working Situation of Constant Current Tube Scanning Circuit
     流管扫描电路的工作状态
短句来源
     Designs of constant current source
     流电源设计
短句来源
查询“恒参”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
没有找到相关例句


In this paper we study the optimum signal design scheme which achieves the minimum biterror probability for the multiuser data communication system in which all the subchannels are uncorrelatedHomogeneous Random Time-Varying Channels (HRTVC) and the users modulate antipodally a set ofassigned signal waveforms without carrier phase or bit interval synchronism among them. We first studythe minimum bi't error probability which can be achieved by signal design for multiuser data communicationsystem over the HRTVC....

In this paper we study the optimum signal design scheme which achieves the minimum biterror probability for the multiuser data communication system in which all the subchannels are uncorrelatedHomogeneous Random Time-Varying Channels (HRTVC) and the users modulate antipodally a set ofassigned signal waveforms without carrier phase or bit interval synchronism among them. We first studythe minimum bi't error probability which can be achieved by signal design for multiuser data communicationsystem over the HRTVC. The corresponding theoretically optimum signals and their physical realizability are next considered. We find that the physical realizable optimum signals' inphase and quadrature components should be complementaryly like a group of bandlimitted white noise. If we use these signals, there is no degradation due to the presence of other users, and the time dispersion of the HRTVC is beneficial and we can fully utilize it by spreading the bandwidth of the system or the time dispersion itself. In the limiting case. the bit error probability of the multiuser data communication system over theHRTVC is equivalent to that of the single user data communication system over the additive white Gaussiannoise channel.

本文研究所有子信道都是同样统计特性的非相关齐次型随机时变信道时,数字多用户通信系统中的最佳调制波形选择即最佳信号设计问题。用户各有自己的调制波形,各波形间不需载波相位及比特区间的同步。本文研究了利用信号设计在理论上所能达到的最小比特差错概率及其对应的最佳信号设计条件、该最佳信号的物理可实现性问题以及物理可实现的最佳信号。指出物理最佳信号的同相与正交分量应互补地像一组限带白噪声。其它用户的存在不会造成系统通信质量的降低。信道的时间扩散不但无害反而有益,可以用扩展系统的带宽(提高传信率、扩大多址容量、扩展调制波形频谱)或信道的时间扩散自身(增加通信距离、减小天线尺寸)来充份利用。在极限情况下,齐次型时变信道多用户数字传输系统将等效于恒参高斯信道中的单用户数字传输系统。

The sequential detecting of received symbol sequences which are transmitted over a Homogeneous Random Time-Varying Channel(HRTVC)is discussed.Then lower and upper bounds on the bit error probability of sequential detectors with different mismatch are obtained.These bounds are rather tight when the SNR and the smbols that interfere with each other are large.We find that there exists an optimum transmis- sion rate which makes the bit error probability minimum for a given mismatch and a given SNR,the more severe...

The sequential detecting of received symbol sequences which are transmitted over a Homogeneous Random Time-Varying Channel(HRTVC)is discussed.Then lower and upper bounds on the bit error probability of sequential detectors with different mismatch are obtained.These bounds are rather tight when the SNR and the smbols that interfere with each other are large.We find that there exists an optimum transmis- sion rate which makes the bit error probability minimum for a given mismatch and a given SNR,the more severe the mismatch,the lower the optimum transmission rate. If there were no mismatch,the intersymbol interference(ISI)would never limite the transmission rate,the more severe the ISI,the better the system performance,and in the limiting case,when the support of the ISI became infinite,the bit error pro- bability would approach to that of the AWGN channel.

本文介绍了应用于齐次性随机时变符号干扰信道中的序列检测枝术,求出了不同失配时,序列检测器比特差错率的上下界。在信噪比较高、符号干扰严重时,上下界相当紧密。在失配与信噪比一定时,存在一个使比特差错率最小的最佳传信率。失配越小,最佳传信率越高。在无失配时,符号干扰再也不是限制传信率的因素,符号干扰越严重,系统性能反而越好。在符号干扰无限严重时,系统反而被改造成恒参高斯信道了。

Due to the fram synchronization method of CCITT recommendation is not good enough in property of resisting fading,we introduce the resisting fading fram synchronization method.in addition,an improved of this method is also proposed. The results obtained from theoretical analysis and the advantages in property of resisting fading compared with the method of CCITT recommcndation. Finally,a scheme of the fram multiplex for PCM 34Mb/s microwave communication system is given and the unit of positive pulse stuffing...

Due to the fram synchronization method of CCITT recommendation is not good enough in property of resisting fading,we introduce the resisting fading fram synchronization method.in addition,an improved of this method is also proposed. The results obtained from theoretical analysis and the advantages in property of resisting fading compared with the method of CCITT recommcndation. Finally,a scheme of the fram multiplex for PCM 34Mb/s microwave communication system is given and the unit of positive pulse stuffing is hardware implemented.

在先进的数字微波通信设备中,为了灵活地传输各种数字微波设备本身所需要的公、业务信号,往往都采用微波帧复接技术。由于在CCITT、CCIR建议中没有关于微波帧复接设备的建议,而且CCITT建议中用于复接设备的帧同步方法仅适用于恒参信道的情况,不适用于有衰落的信道情况如数字微波通信中,因此,有必要研究新的抗衰落帧同步方法。本文在分析了有关帧同步的各种方法之后,提出了一种性能优良的改进抗衰落帧同步方案,井对这种方案的性能作了分析与比较。

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关恒参的内容
在知识搜索中查有关恒参的内容
在数字搜索中查有关恒参的内容
在概念知识元中查有关恒参的内容
在学术趋势中查有关恒参的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社