spread spectrum

A de spread-demodulator for Direct Spread-Spectrum ( DS-SS ) system is introduced.

提出了一种适用于直扩通信系统的解调解扩模块.

The spread spectrum technology is introduced to reduce EMI on the mother board.

PC时钟 发生器采用了频谱扩展技术来减小主板上的电磁干扰(EMI).

The platform of FPGA embedded signal processing based on the idea of software radio is set up to achieve the architecture of system on programmable chip ( SOPC). The time delay estimation model of sound wave spread spectrum system is established with the optimization of algorithm.

在此基础上，结合软件无线电思想，利用FPGA嵌入式数字信号处理平台实现可编程片上系统；建立声波扩频测距时延估计模型，研究数字信号处理优化算法，给出实验结果，分析和讨论测量精度问题。

Spread spectrum CDMA system source code integrity, and can be used directly.

扩频CDMA系统源代码完整, 并可以直接使用.

It can obtain time diversity, spatial diversity and frequency diversity at the same time. So it not only can effectively combat the frequency selective fading in the course of spread, but also the spectrum efficiency is greatly improved.

它将时间分集、空间分集和频率分集有机地结合起来，不仅可以有效地抵抗信号传播过程中遭遇的频率选择性衰落，而且频谱利用率得到很大地提高。

For carrier and bit synchronization, realize those using relative ways. 4. Based on the digital part of the system, test the spectrum-spread receiver at IF, under the condition of large dynamic range, verify the pseudo-code synchronization, carrier synchronization and bit synchronization.

基于弹载测控系统的数字部分，对扩频数字接收机进行中频联试，通过联试结果验证了大动态下伪码同步、载波同步、位同步实现的正确性。

Among the many Spread Spectrum technologies, Direct Sequence Spread Spectrum ( DSSS ) is a most popular technique.

直接序列扩频通信 ( DSSS ) 系统是应用最广泛的一种扩频通信方式.

The author uses FPGA to generate chaotic Spread-spectrum Sequence and dispread.

该系统利用FPGA实现混沌扩频码的产生以及信息的解扩,在接收端实现扩频码的解调.

Spread spectrum technique can improve the robustness of watermarking.

扩频技术应用于数字水印,可以提高水印的鲁棒性.

Pseudo random sequence has broad applications in stream cipher , channel coding, and spread spectrum communication.

伪随机序列在流密码 、 信道编码 、 频通信等领域有着广泛的应用.

Research on Hardware and Software of Digital Spread Spectrum Cordless Telephone Systems

数字扩频无绳电话系统硬软件的研究

Spread Spectrum Watermark complete source code can be used directly.

扩频水印完整的源代码可以直接使用.

Secondly, the coefficients quantization-based image watermarking using spread spectrum communication was discussed.

其次, 讨论了利用扩频通信模型的基于系数量化的图像水印算法.

The paper analyze the radiated disturbance problem in electromagnetic radiated testing about unshielded enclosure terminal product A and B, and give the specified solution plan to reduce the high-frequency radiated disturbance through using spread-spectrum technique and this experiment result prove that the plan is practicable.

文章针对非屏蔽塑料外壳设计的终端产品A、产品B在辐射发射测试中存在的问题，提出了采用扩频技术来抑制高频辐射骚扰的解决方案，并用实验结果证明了此方案是可行的。

In this paper, first, the basic theory and characteristics of spread spectrum communications was introduced.

本文首先介绍了扩频通信的基本理论及其特点,研究了扩频通信系统的基本模型.

Analysis shows that this MSK spread spectrum communication system in the underwater acoustic channel is feasible.

分析表明,采用相位比较差分解调和滑动相关捕获的MSK扩频系统 在水下声信道中的应用是可行的.

Thus , the longer spread spectrum sequences can be used and the robustness accordingly enhanced.

Gold码的应用使得算法可以采用较长的扩频序列,提高了鲁棒性.

It uses spread spectrum technology.

它使用扩频技术.

Spread spectrum communication uses much larger bandwidth than original information using pseudo noise ( PN ) sequences .

扩频通信采用伪随机 编码调制,使用比信息数据大得多的带宽.

Spread spectrum has two distinct flavors: direct sequence and frequency hopping.

该技术有两个明显的变型: 直接顺序与跳频.