Capturing spread spectrum sequence is the premise of spread spectrum communication.
扩频码的捕获是扩频通信的前提。
Two new methods are developed for blind estimation for long-code chaotic spread spectrum sequence.
针对长码实值混沌直扩系统，提出了两种盲解扩算法。
Afterward, we can gain spread spectrum sequence by sampling and quantizing the analog chaotic signals.
对输出的模拟混沌信号进行过采样和最优量化，可得到性能优良的扩频序列。
The design of bit decision algorithm is a key technique for the DS spread spectrum sequence to be received correctly.
码元判决算法的设计是扩频序列能被正确接收的关键技术之一。
Chaos masking, chaotic parameter modulation, chaos shift keying, chaotic spread spectrum sequence are discussed in detail.
其中重点分析了混沌掩盖技术，混沌参数调制技术，混沌键控技术和混沌扩频技术的原理。
This paper proposes a problem that the error tolerance property of spread spectrum sequence influences the performance of spread spectrum system.
提出了扩频码（序列）容错能力影响扩频系统的性能的问题。
A new method of blind estimation for short-code chaotic spread spectrum sequence is proposed, which is based on principal component analysis (PCA) and has good performance at low SNR condition.
针对短码实值混沌直扩系统，提出了一种基于主元分析的算法，实现了在低信噪比下对直扩序列的盲估计。
Finally, making use of autocorrelation function characteristic of spread spectrum sequence, watermark information was detected. In the detection process, it is not requisite for initial carrier image.
最后利用扩频序列的自相关函数特征检测出水印信息，检测过程中不需要原始载体图像。
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。
Direct sequence spread spectrum communications is one of the most typical spread spectrum modes.
其中直接序列扩频通信是目前使用最典型的扩频工作方式。
According to the signal synchronization of LEO's direct sequence spread spectrum (DSSS) communication, a method based on software radio platform was described.
本文针对低轨卫星直接序列扩展频谱(DSSS)通信中的信号同步问题，提出了基于软件无线电平台的处理方法。
The performance of Direct Sequence Spread Spectrum(DSSS) in severe pulsed noise interference will be badly degraded when the duty factor is small.
当脉冲干扰占空比较小时，干扰能量集中，导致直接序列扩频（DSSS）系统的误码性能较差。
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。
The generating of pseudo random sequence is one of the key subjects to realize the spread spectrum technique upgrade for BPC low frequency time code radio station.
伪随机序列的产生是实现BPC低频时码发播台扩展频谱技术升级的一个重要环节。
An algorithm for the suppression of narrowband interference in the direct sequence spread-spectrum (DSSS) systems is presented.
提出了直接序列扩频通信系统中抑制窄带干扰的一种算法。
There are two main alternatives, Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum.
主要有两种选择，直接序列扩频和跳频扩频。
In the system of spread-spectrum communication, the essential point of demodulating information is to ensure the synchronism of local PN sequence and PN sequence of received signals.
扩频通信系统中，保证本地产生的PN序列与接收信号中的PN序列完全同步，是正确解调信息的关键点。
The design scheme of spread-spectrum system based on sequence pairs is discussed.
并对基于序列偶的扩频通信系统设计方案进行了讨论。
A direct sequence spread spectrum (DSSS) receiver has strict requirement on local carrier's synchronization, and always needs complex circuits.
直接序列扩频接收机对本地载波的同步要求非常严格，以往所需电路复杂。
Based on TMS320VC5410 microprocessor developing platform, the direct spread spectrum (DSS) sequence secrecy com-munication system is studied.
基于TMS320 VC 5410微处理器开发平台，对直扩序列保密通信系统进行了研究。
Spectra expanding of Spread spectrum communication system makes use of the spread spectrum function to realize, the typical spread spectrum function is pseudo random sequence code.
直接系列扩频通信系统的频谱扩展是借助于扩频函数而实现的，典型的扩频函数就是伪随机序列码。
Presented in this paper is a direct sequence spread spectrum radio based on virtual technique in which direct sequence spread spectrum, software radio and virtual technique are combined.
文中提出的虚拟式直接序列扩频通信电台将直接序列扩频通信、软件无线电和虚拟技术相结合。
We put forward a method which can easily be realized in DSP and direct sequence spread-spectrum system based on QPSK, it achieved a good performance in tests.
提出了易于在DSP以及QPSK的直接序列扩展频谱系统中实现的方法，并在测试中达到了较好的性能。
Aiming at the acquisition problem of direct sequence spread-spectrum (DSSS) signals with large Doppler offset, a new method based on fast Fourier transform (FFT) is proposed.
针对具有大多普勒偏移的直接序列扩频信号捕获问题，提出一种基于快速傅里叶变换(FFT)的多普勒和伪码分别并行搜索的捕获新方法。
In direct sequence spread spectrum communication system, enemy is assumed to detect whole PN sequence chip by chip and a modulated retransmitted interference is created.
在直接序列扩频通信系统中，假设敌方能够逐个比特地检测到整个PN序列，并产生一个调制的转发干扰。
Direct sequence spread spectrum (DSSS) and despreading first structure is most advantageous of all kinds of spread spectrum techniques.
扩频系统中性能最好的是直接序列扩频的先解扩后解调方式。
Reverse-spread spectrum device, time sequence inspection device, channel evaluation device and method for measuring frequency faults.
逆扩频装置，时序检测装置，信道估计装置和频率误差测量方法。
A better method for direct sequence spread spectrum (DSSS) receiver to decrease the acquisition time is proposed.
提出一种减小直接序列扩频(DSSS)接收机信号捕获时间的改进方法。
This paper discusses the despread of low signal to noise ratio of the direct sequence (DS) spread spectrum signals using intermediate-frequency recirculation summation loop (IFRSL).
本文讨论了用中频积累法实现低信噪比直接序列扩频信号的解扩。
Spreading sequences design is one of the key task in the direct-sequence spread spectrum communication systems.
扩频序列设计是直接序列扩频通信系统的关键课题之一。
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