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.
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.
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.
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.
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.
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.
正交频分复用和直接序列扩频技术是解决该问题的有效手段。
The orthogonal frequency division and the direct sequence spread spectrum technology are effective methods.
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.
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).
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.
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.
在扩频通信技术中，直接序列扩频和跳频是应用最广的两种扩频技术。
In the spread spectrum communication, direct sequence spread spectrum (DSSS) and frequency hopping (FH) are the two kinds of most widely used spread spectrum technologies.
该设计被应用于全数字直接序列扩频接收机中，并取得了满意的效果。
And in the application of all digital DSSS receiver, this DMF behaved very well.
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.
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.
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.
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.
直接序列扩频技术是应用最广的一种扩频技术，研究它便于掌握扩频技术的精髓。
Direct sequence spread spectrum technique is the most widely used one and the kernel of the spreading spectrum techniques for people to study.
直接序列扩频信号具有较低的功率谱密度，信号淹没在背景噪声中，侦查难度较大。
Due to its low power spectral density, the direct sequence spread spectrum signal is always submerged with the back-ground noise, so that it is difficult to reconnoiter the signal.
直接序列扩频信号具有较低的功率谱密度，信号淹没在背景噪声中，侦查难度较大。
Due to its low power spectral density, the Direct Sequence Spread Spectrum signal (DSSS) is always submerged with the back-ground noise, so that it is difficult to reconnoiter the signal.
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.
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.
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.
在直接序列扩频机理的基础上，就其抗干扰能力给出了理论分析，并指出其优点及不足之处。
Based on the mechanism of direct sequence spread spectrum (DSSS), an analysis is made of the anti noise capability of the DSSS and its advantages and disadvantages are proposed.
然后详细介绍了自编码直接序列扩频通信的原理、自编码扩频序列的产生方法及其统计特性。
Then the principle of SESS system is introduced. The generation of the SESS spreading code and its characteristics are also analyzed.
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.
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.
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.
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