In this paper, we analyze the BER performance of pilot symbol assisted two-dimensional spread spectrum systems with coherent demodulation in multi-path fading channels.
在多径衰落信道中，本文分析了导引辅助的二维扩频相干解调的误码率性能。
Computer simulations show that it is superior to the conventional approaches in most cases and thus is a good approach for narrow-band interference suppression in spread spectrum systems.
通过计算机仿真可以看出，在多数情况下它比传统方法的性能优越，这表明它是一种对于扩频系统中窄带干扰的抑制的好方法。
The rejection techniques of broadband interference have caused more and more attention in Spread Spectrum(SS) communication systems.
扩频通信系统中宽带干扰的抑制技术越来越引起人们的重视。
Methods and systems for time synchronizing a receiver to a spread spectrum signal are described.
本发明描述了接收机与扩频信号进行时间同步的方法和系统。
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。
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.
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。
Traditional blind additive ss (spread spectrum) watermarking systems have such features: high robustness, low detection value and small capacity.
传统盲加性扩频水印系统具有鲁棒性高、检测值低、容量小的特点。
A novel scheme for enhancing antijamming capabilities of spread spectrum communication systems is proposed in the paper.
本文提出了一种用于提高扩谱通讯系统抗干扰能力的新方案。
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。
It consists of three main parts: in the first part, we analyse the effect of multipath on code-tracking loops of receivers in Spread-Spectrum Ranging Systems.
本文分为三个主要部分：第一部分分析了多径对扩频测距系统接收机码跟踪的影响机理。
Multipath is one of the major sources in the Spread-spectrum ranging systems.
多径是扩频测距系统的主要误差源之一。
In spread-spectrum communication systems, the essential task which has to be performed is the synchronization of receiver pseudonoise (PN) signal with the pseudonoise signal contained in the input.
扩谱通信中一个最基本的任务就是实现本机的伪随机信号与接收的伪随机信号的同步。
Direct sequence spread spectrum (DS SS) technique has been widely used in military communications systems.
在军事通信中，直扩技术由于其诸多优点而获得了广泛的应用。
Therefore, spectrum spread systems lose efficiency when dealing with wide band interference.
因此，扩频系统在面对宽带非平稳干扰时，抑制效果十分有限。
Synchronization is one of the key techniques in spread spectrum communication systems. The paper proposes a synchronization scheme suited for common simulation software.
同步是扩频通信的关键技术之一，本文针对直扩系统，给出了一个利用通用仿真软件包对其进行仿真的方案。
In the presence of narrow-band interference (NBI), the performance of direct spread-spectrum systems (DSSS) can be improved by using various interference rejection filters.
在存在窄带干扰时，扩频通信系统的性能可以通过使用各种不同的抗干扰滤波器来进一步提高。
The performance of chaotic spread-spectrum communication systems can be improved by employing these formulas.
利用这些结果可有效提高混沌扩频通信系统的性能。
Power amplifiers (PA) used in 3G wireless communication systems based on spread spectrum techniques must exhibit exceptional linearity.
而基于扩频技术的第三代无线通信系统中的功率放大器必须要有很好的线性性能。
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。
Considering the spread spectrum orientation systems using difference carrier phase to measure distance, this paper proposed a method for acquiring difference carrier phase by using pilot symbol.
考虑利用载波相位进行测距的扩频无线电导航系统，该文提出了一种基于导引符号的两导航台载波差分相位的提取方法。
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.
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。
Pseudo-random sequences with optimal properties such as correlation, high linear spans, balance and long period are widely used in CDMA system, spread spectrum and hopping communication systems.
具有优良相关性，大线性复杂度，平衡性，长周期的伪随机序列广泛应用于CDMA系统，扩跳频通信系统。
He headed a group of engineers, whose duty was to develop frequency synthesizers and local generators for frequency hopping spread spectrum and satellite systems.
他还带领一个工程师团队，负责研究用于跳频扩频以及卫星系统的频率合成器和局部发生器。
He headed a group of engineers, whose duty was to develop frequency synthesizers and local generators for frequency hopping spread spectrum and satellite systems.
他还带领一个工程师团队，负责研究用于跳频扩频以及卫星系统的频率合成器和局部发生器。
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