spread-spectrum communications造句

• Spread - spectrum function of spread - spectrum communication system
  扩频通信中的扩频函数
• Application of avalanche transistor in spread - spectrum communication
  雪崩三极管在扩频通信中的应用
• Analysis of processing gain in spread - spectrum communication system
  扩展频谱通信系统处理增益的分析
• The designing of super - regenerative theory - based broadband receiver for direct - sequence spread - spectrum communication system
  通信系统中基于超再生技术的新型宽带接收机的设计
• Spread - spectrum communication is one of the communication mode , which has vast vista and is widely used in military communication and in civil communication
  扩展频谱通信是具有广阔发展前景的通信方式之一，并广泛应用于军事通信和民用通信中。
• Combining walsh sequence with direct spread spectrum sequence , we can construct hybrid ds - fh spread - spectrum communication mode . this is very important for the mode to have better performance on anti - multiple - access inference and anti - near - far inference
  将walsh函数序列与直接扩频序列相结合构成的ds - fh混合扩频通信方式对于系统抗多址干扰和远近效应具有重要意义。
• In spread - spectrum communication positioning system , the multi - path signal is always existing and unable to be eliminated . how to extracting its multi - path rapidly and real - timely is one of the key techniques in mobile communication positioning system
  在扩频通信定位系统中,多径信号是一个普遍存在而又难以消除的干扰,如何实时有效的估计和提取多径干扰分量是提高移动通信定位精度的关键技术之一。
• This paper presented a general systematic view of the power - line data transmission through ssc ( spread - spectrum communication ) technology . furthermore , it put forward two application schemes in the automatic reading ammeter system
  系统、全面地介绍了电力线载波通讯技术的特点、应用及发展状况，并对目前的电力线载波通讯芯片进行了比较；同时，也提出了电力线载波通讯技术运用在远程自动抄表系统中的应用方案。
• 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。
• 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。
• 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。
• In addition , hybrid spread - spectrum communication system is propitious to enhance anti - jamming performance of the system that is make up of direct sequence ( ds ) and frequency hopping ( fh ) , and it can satisfy the require of anti - jamming of systems . it concentrate their virtue and overcome shortage in single spread spectrum style . this paper discusses the aspect in detail
  另外，将扩频技术中应用最广泛的两项技术直序扩频( ds )和跳频( fh )结合在一起，构成混合扩频通信系统，有利于提高系统的抗干扰性能，更能满足系统抗干扰的要求，而且将跳频系统和直扩系统的优点集中起来，克服了单一扩频方式的不足。
• Circular symmetric spread spectrum digital image watermarking using chaotic sequences as the watermark takes advantage of the discrete fourier transform properties and spread - spectrum communication techniques to embed a circular symmetric watermark in the frequency domain . the watermark can be detected without the presence of the original image even when the watermarked image suffers geometrical attacks such as translation , rotation and scaling . experimental results show that the proposed scheme has good transparency and highly good robustness to geometric transformations
  基于混沌序列的圆对称扩频水印方案是以实值混沌序列作为水印，根据离散傅立叶变换的特性并结合通信上的扩频技术，将一圆对称水印嵌入到了图像的频域中，且即使图像遭受了平移、旋转、缩放等几何攻击检测水印也不需要原图像。