spread-spectrum中文是什么意思

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中文翻译
造句

扩展频谱

spread vt. (spread) 1.伸开，伸长(手臂等)，展开 ...
spectrum n. (pl. -tra ) 1.【物理学】谱，光谱；波 ...
spectrum spread 频谱扩展
spread spectrum 扩频,扩展频谱; 展布频谱; 展频
direct sequence spread spectrum 直接序列扩频直接序列扩频; 直接序列散谱; 直接序列展频技术
dsssdirect sequence spread spectrum 直接序列扩展
frequency hopping spread spectrum 跳频扩频; 跳频展频技术
frequency-hopping spread spectrum 跳频扩展频谱; 跳频展频
hybrid spread spectrum 混合扩频
spread spectrum communication 扩频通信; 微波扩展频谱通信
spread spectrum communication system 扩展频谱通信系统
spread spectrum modulation 扩展频谱调制
spread spectrum modulation ssm 扩频调制
spread spectrum modulation technique 展布频谱调制技术
spread spectrum multiple access 扩展频谱多址; 展布频谱多址
spread spectrum pseudo noise 扩展频谱伪噪声
spread spectrum radio 展频无线电
spread spectrum random access 扩展频谱随机选址
spread spectrum signal 扩散频谱信号; 扩展频谱信号
spread spectrum systems 分散光谱系统
spread spectrum technique 扩展频谱技术; 展布频谱技术
spread spectrum titransmission 展布频谱传输
spread spectrum transmission 宽频带传输; 扩展频谱传输; 展开光谱传输
spread-spectrum communications 传播光谱技术
spread-spectrum technology 展频技术

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例句与用法

Ds / fh hybrid spread - spectrum communication system base on software radio is researched in theory . performance of the system is analyzed and evaluated in anti - jamming by software simulation . so it testify feasibility of the system
本课题针对这方面作了详细地讨论，就基于软件无线电技术的ds fh混合扩频通信系统从理论方面进行了研究，通过仿真，对系统在抗干扰方面的性能作了分析，并进行了性能评估，从而验证了系统的可行性。
( 5 ) the optimal neural network model of chaotic generation are built to generate chaotic spread - spectrum sequences , and its optimized methods are proposed . results show that these optimized chaotic sequences are much better than traditional sequences ( for example gold sequences ) and those generated by chaotic map
( 5 )提出了应用神经网络及其优化模型来产生混沌扩频序列的方法，并提出了混沌序列的优选方法，结果表明，优选后扩频序列的性能有较大程度的提高。
Conventional detector ( single - user matched filter ) distinguishes each user by the crosscorrelation of their spread - spectrum codes . in practice , however , its performance is much deteriorated due to the existence of noise in channel and strong multi - access interference , i . e . near for effect . a new method using independent component analysis is proposed in this paper . the - received energy of signals is controlled effectively , thus the near - far effect is overcome as much as possible ; moreover , the effect that noise imposed on the detector is mostly reduced . simulations verify the effectiveness of this method
传统检测器(单用户匹配滤波)利用扩频码之间的互相关特性来区分各用户信号.而在实际应用中，信道噪声和近距离用户对远距离用户的强多址干扰即远近效应，使得接收机的性能受到很大影响.本文将独立分量分析法引入传统接收机，有效控制接收信号的能量，从而极大地提高了接收机的抗远近性能，同时噪声的影响被尽可能消除.仿真结果表明了该方法的有效性和可行性
This paper researches the integrating application of adaptive antenna array technology , spread - spectrum communication technology and transform - domain filter technology in shortwave communication area , basing on the background of improving on the shortwave communication equipments being used in chinese army , and all the key techniques mentioned above are implemented in a single fpga chip
本文以改造我军现役短波通信设备为背景,研究了自适应天线阵技术、扩频通信技术、变换域滤波技术等多种现代数字信号处理技术在短波通信中的综合应用,并以单片超大规模fpga芯片为硬件处理平台,对系统中的关键技术进行了设计与实现。
As a complex nonlinear dynamics behavior , chaos is a general phenomenon in nature and is one of the most important discoveries in the 20th century later . chaos , which is generated by non - linear dynamical system , possesses many unusual characteristics and these characteristics enable chaos to have a great charming prospect and practical value in secure communication field . recently , chaotic communication has become a new and promising subject , so this dissertation selects it as research direction , and analyses emphatically the applications of chaos in cdma communication system . the main works are as follows : ( 1 ) chaotic phenomena and its related problems are summarized , and these problems , such as the relation of spread - spectrum code in cdma communication system and chaotic sequences , and the relation of chaotic synchronization and system secret performance , are discussed
混沌是一种特殊复杂的非线性动力学行为，也是自然界普遍存在的现象，被认为是二十世纪末期最重要的科学发现之一。有确定性非线性动力学系统产生的混沌具有许多奇异的特性，显示了混沌在保密通信等领域有着诱人的应用前景和重大的实用价值，目前，混沌理论在通信中的应用是一个全新的前沿课题。本文以此作为研究方向，着重分析了混沌在码分多址通信系统中的应用。
Abstract : in this paper , we study the synchronization approach for hyperchaos system of 4th - order cellular neural network analyze its pefforraance in the presence of parameter mismatch and channel noise , and propose a design method for a spread - spectrum secure communication system based on hyperchaos of cellular neural network
文摘:研究了四阶细胞神经网络超混沌系统同步方法，分析了系统存在参数失配和信道噪声时的同步性能，提出了一种基于细胞神经网络超混沌同步系统的扩展频谱保密通信设计方法。
The theory and main characteristics of wireless spread - spectrum technology are analyzed , and based on it , a wireless local area network ( wlan ) of gps real - time supervisory system for roller compaction is established , which not only implements the bidirectional data communication between general control center and each mobile remote , but also achieves resource share among each node of the wlan
摘要分析了无线扩频技术的原理及主要特点，组建了碾压gps实时监控系统的无线局域网，实现了总控中心和各移动远端的双向无线数据传输及局域网内各节点的资源共享。
( 4 ) the mathematical expressions of statistical properties of chaotic sequences generated by chebyshev - map are derived . their statistical properties are identical with those of white noise , and they are suit to be spread - spectrum address sequences . the appropriate number of chips contained in one information bit is gained for these chaotic spread - spectrum sequences . this provides the theoretical basis for chaotic sequences as address code
( 4 )首次推导了chebyshev混沌映射产生混沌扩频序列统计特性的数学表达式，得出其与白噪声的统计特性一致，适合作为扩频地址码，并导出了每个信息比特所含合适的切普数。
To assure that the hybrid ds - fh spread - spectrum communication mode has better capability of information safety and inference suppression , i bring forward a design scheme of ds - fh spread - spectrum communication system and solving effectively the crucial problem such as how to choose the user address , how to choose the hopping frequency and how to avoid the collision of the frequency which is used by different users at the same time
为保证系统可靠、有效地工作，本文提出了一种ds - fh混合扩频系统的设计方案，并且有效地解决了系统的用户选址、频率选择和频率碰撞等关键问题。通过系统设计仿真证实了ds - fh混合扩频系统具有优于ds系统的抗干扰性能，并在一定程度上提高了系统的抗远近效应能力。
Secondly , we apply tk operator to the cross - correlation of received signal code and pn code to separate the multi - paths . it comes to a conclusion that tk operator can separate the multi - paths within less than the chip period accurately of spread - spectrum system with space - modulation by simulation . at last , we apply this algorithm to the practical signal collected by gps tap , and from the result we can drop a conclusion the tk algorithm is practical
本文首先阐述了时空调制扩频信号原理以及在多径干扰下时空调制接收机的性能和teager - kaiser接收机的原理;接着对时空调制扩频系统的解调信号与伪码的互相关函数采用tk接收机进行多径分离,仿真结果表明, tk接收机对时延在一个码片内的时空调制扩频通信多径信号有很好的分离效果;最后用数据采集器对一个gps信号进行接收和多径的估计,验证了该算法在实际的运用中对多径的扩频信号有很好的分离效果。