It mainly contains the digital modulate system, the SS communication theory and the direct sequence spread spectrum (DSSS) system.
主要是数字调制系统、扩展频谱通信原理和直接序列扩频系统等内容。
Spread Spectrum technique is widely used in digital cell-phone mobile communication system, satellite mobile communication, inside wireless communication and future personal communication.
扩频技术在数字蜂窝移动通信系统、卫星移动通信、室内无线通信和未来的个人通信中被广泛采用。
This paper proposes a natural language digital watermark method on paragraph level, by introducing spread spectrum technique to encode the watermark.
通过引入扩展频谱技术对水印信息进行编码，提出一种篇章层的自然语言数字水印方法。
Thepurpose of this paper is that taking use of modern digital technical applyat correlative processing in the IF signal of spread-spectrum system.
本课题研究的主要目的就是利用现代数字技术对扩频通信系统中的中频接收信号进行相关处理。
Aiming at the spectrum spread problem of traditional digital modulation signals, a time-phase modulation (TPM) method with abrupt phase change characteristic is proposed.
针对传统数字调制信号频谱扩展问题，提出具有相位突变特性的时相调制(TPM)方式。
The relation between the digital watermarking and spread-spectrum was analyzed at first, A spread-spectrum adaptive digital watermarking scheme based on the wavelet transform was proposed.
在分析了自适应小波变换和扩频特性关系的基础上，提出一种基于小波变换的扩频数字水印算法。
Based on the spread spectrum communication theory, combine digital signal-processing chip DSP and FPGA, this article researches and designs the receiver system for regional radio navigation.
本课题以扩频通信为理论基础，结合目前广泛使用的数字信号处理芯片DSP和FPGA，研究了区域无线电导航系统接收机数字信号处理平台。
Then digital matched filter (DMF), which is used to synchronize spread spectrum code, especially the multi-rate sampling in DMF is studied.
然后探讨了用于扩频码同步的数字匹配滤波器（DMF），着重分析了DMF的多倍码速率采样问题；
In this paper, a spread spectrum digital watermark based on Gaussian pyramid decomposition was proposed.
提出了一种基于高斯金字塔分解的数字图像扩频水印技术。
On conditions of the current technology, the thesis puts forward a new high dynamic and whole digital spread spectrum receiver which is based on the high density programmable logic devices.
根据现有的软硬件技术条件，结合实际需要，本论文提出并详细分析了一种新的基于高密度可编程逻辑器件的高动态全数字解扩接收机系统。
The paper introduces a kind of digital spread spectrum receiver based on FPGA , describes function models, programmable method and time relation.
介绍了一种基于FPGA设计的数字化扩频接收机，阐述了接收机各功能模块功能、编程方式及时序关系。
Most spread-spectrum signals use a digital scheme called frequency hopping.
大多数扩展频谱信号用数字计划称为跳频。
The DS/CDMA digital mobile communication system is based on Spread-spectrum technique and CDMA technique.
扩频技术在码分多址通信中的应用产生了DS/CDMA数字蜂窝移动通信系统。
The M-sequences signal can simulate the white noise, which has been widely applied in the fields of spread spectrum communication, digital cryptography, digital system test and so on.
序列信号可以模拟白噪声，广泛应用于扩频通信、数字加密、数字系统测试等领域。
This paper introduces an AFC algorithm for a zero-intermediate frequency direct-sequence spread spectrum digital receiver.
为了使得射频源和波导管的频率保持一致 ，采用了自动频率控制系统 （AFC）。
In addition, we introduce the integration of the spread spectrum technology and the digital watermark technology, so this digital technology has a strong haleness and safety.
另外介绍了扩频与数字水印技术的结合，利用扩频原理的数字水印技术具有很高的健壮性和安全性。
In addition, we introduce the integration of the spread spectrum technology and the digital watermark technology, so this digital technology has a strong haleness and safety.
另外介绍了扩频与数字水印技术的结合，利用扩频原理的数字水印技术具有很高的健壮性和安全性。
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