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。
Methods and systems for time synchronizing a receiver to a spread spectrum signal are described.
分析计算结果表明，直扩系统的误码性能与码片波形的选择密切相关，并且与扩频码片的最大比合并有效性是相一致的。
The results suggest that the BER performance of DSSS communication system has close relationship with the chip wave-shaping and is consistent with MRCE (Maximal Ratio Combining Efficiency).
基于声光技术与循环谱相关技术，提出了扩频信号的声光谱相关检测方法。
Based on AO technique and cyclic spectral correlation technique, the method of AO spectral correlation detection is proposed.
在多径衰落信道CDMA系统中，扩频码设计与联合检测为提高系统容量的两个重要手段。
Spreading code design and joint detection are two efficient ways to increase CDMA system capacity in multi-path fading channels.
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。
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.
此项技术叫做互补码键控（CCK），他只与原标准中规定的直接顺序扩频（DSSS）技术一起工作。
Called complementary code keying (CCK) the technique works only in conjunction with the DSSS technology specified in the original standard.
目前，无人机数据链系统采用的调制模式都比较简单，如2FSK、BPSK、直接扩频技术等，传输速率与抗干扰能力有限。
The modulation types of data link for UAV are simple, such as BPSK, 2FSK , direct spread spectrum. The transmitted rate and anti-interference performance of them are limited.
讨论了高动态、低信噪比、长伪码序列扩频信号的伪码捕获、跟踪、载波跟踪与数据解调方法。
The paper discusses the acquisition and tracking of the PN code and the tracking of the carrier in high dynamic range , low SNR and long PN code.
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.
另外介绍了扩频与数字水印技术的结合，利用扩频原理的数字水印技术具有很高的健壮性和安全性。
In addition, we introduce the integration of the spread spectrum technology and the digital watermark technology, so this digital technology has a strong haleness and safety.
与传统的MC - CD MA系统相比，其主要区别是该方案同时在时域和频域进行扩频。
Comparing with the conventional MC-CDMA system, the main difference is that this scheme performs the spreading in the time and frequency domain simultaneously.
因此，开展对粒子滤波技术及其在混沌扩频DS - CD MA通信系统中的应用的研究具有重要的理论与现实意义。
Therefore, researching particle filtering techniques and its applications in the chaotic spread spectrum DS-CDMA system has great theoretical and practical significance.
在DS - CD MA接收机中，正确解调的首要条件是实现本地扩频码与发送扩频码的码片同步。
Chip timing synchronization between local spread sequence and transmitted spread sequence is critical. in DS-CDMA receiver.
随着扩频技术自身理论和技术趋于完善，扩频技术与移动通信的联系也将越来越紧密。
With its spread-spectrum technology to perfect the theory and technology, spread-spectrum technology and mobile communications will be more closely linked.
该文将扩频码设计与联合检测结合起来，提出了一种具有组间零相关窗特性的新型扩频码。
A novel spreading code with group-wise zero correlation window is proposed in this paper by combining the spreading code design and joint detection.
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.
Ÿ 能承担本科生《通信原理》、《卫星通信》及《移动通信》课程及研究生《信息论与编码》、《扩频通信》及《通信网理论与技术》课程的教学工作。
Construct the course and experiment courses for undergraduate in "Remote Sensing Science and Technology" and the course for graduate in "Signal and Information Processing".
与传统直扩序列相比，混沌扩频序列具有非线性复杂度较高的优点，该优点同时也是盲估计混沌扩频序列的难点。
Chaotic direct sequence spread spectrum (CD3S) signal is more nonlinear and more complex than the conventional direct sequence spread spectrum signal.
与传统直扩序列相比，混沌扩频序列具有非线性复杂度较高的优点，该优点同时也是盲估计混沌扩频序列的难点。
Chaotic direct sequence spread spectrum (CD3S) signal is more nonlinear and more complex than the conventional direct sequence spread spectrum signal.
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