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.
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.
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.
提出了一种用于直接扩频通信系统（DSSS）快速捕获，新型组合声表子波（SAW）卷积器序列搜索码捕获方案。
A new combined Surface Acoustic Wave (SAW) convolver, or a serial searching code acquisition scheme for direct sequence spreading spectrum (DSSS) communication system is presented.
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.
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.
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。
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.
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.
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.
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.
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.
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.
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).
本文讨论直接序列扩展频谱通信系统中有关同步捕获和跟踪的问题。给出了直接扩频系统的滑动搜索自同步方案。
Contributed to the acquisition and Code tracing for the DS spread spectrum com munication systems, this paper presents the scheme of sliding search self-synchronization for a DS system.
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.
针对直接序列扩频信号，介绍了其发射和接收部分基本组成，给出了系统接收部分的具体设计框图。
The paper introduces the basic composition of transmitter and receiver in direct-sequence spread spectrum system and gives the detailed design block diagram of the receiver.
在详细说明了扩频通信的理论基础之后，对直接序列扩频技术及系统作了介绍。
Secondly, the system physical layer's key technology—Direct Sequence Spread Spectrum (DSSS) is described.
扩频通信技术中，最常见的是直接序列扩频通信(DS - SS)系统，本论文所研究的就是这一类通信系统。
In this dissertation, the author mostly research on Direct Sequence Spread Spectrum (DS-SS), the most ordinary one within Spread Spectrum technologies.
根据扩展频谱方式的不同，扩频通信系统分为：直接序列扩频、跳频扩频和混合扩频。
According to different ways of spread spectrum, spread spectrum communication systems are divided into: direct sequence spread spectrum, frequency-hopping spread spectrum and hybrid spread spectrum.
在直接序列扩频通信系统的扩频增益受限时，强功率的窄带干扰对系统性能影响较大。
In direct sequence spread spectrum communication system when the spreading gain is limited, the performance of the communication system will be impacted by the strong power of narrowband interference.
与直接序列扩频的方案相比，基于多频带OFDM的UWB系统能更有效地捕获多径能量。
The MB-OFDM UWB systems can capture multi-path energy more efficiently than DS-UWB. Much work has been done on the channel estimation of traditional narrow-band OFDM.
与直接序列扩频的方案相比，基于多频带OFDM的UWB系统能更有效地捕获多径能量。
The MB-OFDM UWB systems can capture multi-path energy more efficiently than DS-UWB. Much work has been done on the channel estimation of traditional narrow-band OFDM.
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