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。
Direct sequence spread spectrum communications is one of the most typical spread spectrum modes.
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。
It mainly contains the digital modulate system, the SS communication theory and the direct sequence spread spectrum (DSSS) system.
为了给验证算法提供现实的BPSK调制的直接序列扩频信号，本文详细介绍了一种多参数可调的扩频信号源的设计方案。
In order to supply the actual BPSK DS-SS signal to verify the algorithms, this dissertation present a design method of spread spectrum signal generator with adjustable muti-parameter in detail.
本文给出了直接序列扩频信号正交分路周期相关检测算法的性能分析。
The performance analysis of quadrature correlation detection algorithm for DS-SS signal is presented.
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。
The performance of Direct Sequence Spread Spectrum(DSSS) in severe pulsed noise interference will be badly degraded when the duty factor is small.
本文对低信噪比直接序列扩频（DS／SS）信号的检测提出了设计方案和算法。
One detection design block diagram and algorithms for low S/N DS/SS signal are presented in this paper.
主要有两种选择，直接序列扩频和跳频扩频。
There are two main alternatives, Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum.
直接序列扩频技术在军事通信中得到了广泛的应用。
The technology of directs sequence spread spectrum (DSSS) have been applied in the military communication widely.
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。
A better method for direct sequence spread spectrum (DSSS) receiver to decrease the acquisition time is proposed.
研究了用于低轨卫星通信的直接序列扩频系统的码捕获技术。
It is studied that the code acquisition technology of direct sequence spread spectrum system in LEO satellite communication.
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。
A direct sequence spread spectrum (DSSS) receiver has strict requirement on local carrier's synchronization, and always needs complex circuits.
论述了直接序列扩频测距的原理，研究了近距离测距的回波模型。
The principle of direct sequence spread spectrum ranging is introduced and the echo model of near field ranging is discussed.
干扰抑制是提高直接序列（DS）扩频通信系统抗干扰能力的重要手段。
The anti jamming capability of DS/SS communications systems can be enhanced significantly by interference suppression techniques.
推导了在直接序列扩频信号带宽等于跳频频隙间隔时系统的误码率公式。
The BER formula is derived when a DS spread spectrum signal bandwidth is equal to the FH slot spacing.
针对直接序列扩频通信中的载波恢复问题，提出了一种基于自适应算法设计的双pll载波跟踪方法。
For the problem of carrier recovery in DS-SS communication, the model of dual PLL is presented, which is designed based on the auto -adapted algorithm.
文章介绍了直接序列扩频通信的原理及其优点，针对不同的干扰方式，对直接序列扩频通信的抗干扰能力进行分析。
The paper introduces the principle and the merit of DSSS communication, then analyze the anti-jamming capability of DSSS communication in the case of many kinds of jam.
基于软件无线电的思想，论述了直接序列扩频接收机的数学模型，进而建立了一个宽带中频采样直扩系统接收机的实现框图。
On the basis of software radio, a mathematics model about DSSS receiver is described, and a realization diagram of wide_scope intermediate frequency sampling DSSS receiver is builded.
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。
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.
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。
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.
提出了一种面向直接序列扩频（DS-CDMA）通信系统的基于导频信号的自适应信道估计方法。
The estimation scheme for DS-CDMA systems includes a computationally efficient and easily implemented pilot filter on CDMA forward channel.
根据目前直接序列扩频通信的军用情况，研究了直接序列扩频通信电台的战术应用，对提高其战斗效能具有重要意义。
According to the martial applications of DSSS communication, the article studies the tactical use of DSSS radios. It is of real significance for us to improve the battle effectiveness of DSSS radios.
扩频序列设计是直接序列扩频通信系统的关键课题之一。
Spreading sequences design is one of the key task in the direct-sequence spread spectrum communication systems.
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。
An algorithm for the suppression of narrowband interference in the direct sequence spread-spectrum (DSSS) systems is presented.
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。
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.
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。
Direct sequence spread spectrum (DSSS) and despreading first structure is most advantageous of all kinds of spread spectrum techniques.
该文提出一种基于门限估计的直接序列扩频(DS - SS)通信系统窄带干扰变换域抑制方法。
This paper proposes a method for narrowband interference suppression in Direct Sequence Spread System (DS-SS).
CDMA2000采用多载波和直接序列扩频两种方式来达到提供宽带数据业务的目的。
Multi-carrier and direct-spread-spectrum are employed by CDMA2000 to support wideband data service.
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。
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).
首先分析了超宽带技术与传统的直接序列扩频技术的区别，然后建立了TH -IR和DS - IR超宽带系统的仿真模型，得到两种IR系统在多种干扰条件下的误码率性能。
The difference between UWB and the traditional direct sequence spread spectrum technology was analyzed, and the simulation models of TH-IR and DS-IR systems were installed.
首先分析了超宽带技术与传统的直接序列扩频技术的区别，然后建立了TH -IR和DS - IR超宽带系统的仿真模型，得到两种IR系统在多种干扰条件下的误码率性能。
The difference between UWB and the traditional direct sequence spread spectrum technology was analyzed, and the simulation models of TH-IR and DS-IR systems were installed.
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