1) non-coherent DSSS
非相干直接序列扩频
1.
A base-band model for non-coherent DSSS(Direct Sequence Spread Spectrum)signal is built after its basic conception is introduced.
介绍了非相干直接序列扩频的基本概念,并建立了非相干直接序列扩频信号基带传输模型;在此基础上研究了直接序列扩频中捕获的难点,并提出一种基于后相关滤波和功率检测的捕获方法;最后,根据工程需要对系统进行了简化。
2.
The necessity of timing recovery for Non-coherent DSSS signal is analyzed at first,then the de-correlated signal is converted into high rate sampled non-DSSS signal by applying moving average,and at last,a proper algorithm that is normally used for the timing recovery of non-DSSS signal is used to estimate the timing error of the non-coherent DSSS signal.
首先分析了定时恢复在非相干直接序列扩频中的必要性,然后利用滑动平均器将解扩后的非相干扩频信号等效为高倍采样的非扩频信号,最后选择了一种适合于非扩频信号定时估计的算法,并将该算法用于非相干扩频信号的定时估计。
2) aperiodic direct sequence spread spectrum
非周期性直接序列扩频
1.
To solve the problem of blind estimation of PN sequence in aperiodic direct sequence spread spectrum signals,a method based on Hardlimited Hebbian rule is proposed here.
为了解决非周期性直接序列扩频信号的盲估计难题,提出了以2倍信息码元宽度为分段长度、利用基于硬限幅Hebbian学习规则的神经网络算法提取各段主分量,以获得PN码序列的盲估计方法。
3) DSSS
直接序列扩频
1.
System of Coal Mine Communication Based on DSSS;
基于直接序列扩频技术的矿井通信系统
2.
Design of a multiplexing DSSS modulator based on software radio;
基于软件无线电的多通道直接序列扩频调制器的设计
3.
PLC based on DSSS and application;
基于直接序列扩频的电力线通信及其应用
4) direct sequence spread spectrum(DSSS)
直接序列扩频
1.
A linear frequency modulation(LFM) interference suppression method in direct sequence spread spectrum(DSSS) receiver based on Radon-STFT is proposed.
提出了一种基于R adon-短时傅里叶变换(R adon-STFT)的直接序列扩频(DSSS)系统线性调频干扰的抑制方法。
5) direct sequence spread spectrum
直接序列扩频
1.
Design of direct sequence spread spectrum communication system on Z87200 chip;
基于Z87200的直接序列扩频收发系统设计
2.
A novel direct sequence spread spectrum matched filter based on four-terminal device;
用四端子器件实现的一种新型直接序列扩频匹配滤波器
3.
A Power Reading System Based on Direct Sequence Spread Spectrum Communication Technology Via Power Line;
采用直接序列扩频通信技术的电力线载波集中抄表系统
6) direct-sequence spread-spectrum
直接序列扩频
1.
FPGA implementation of the despreading module in direct-sequence spread-spectrum system
直接序列扩频系统解扩模块FPGA实现
2.
This paper summarizes the detection and parameter estimation methods of direct-sequence spread-spectrum signal in low signal to noise ratio conditions,and compares their advantages and disadvantages.
总结了在低信噪比下直接序列扩频信号检测和参数估计的方法,并比较各个方法的优缺点。
3.
Synchronization is one of the key techniques in direct-sequence spread-spectrum systems.
针对直接序列扩频(DS-SS)系统中,需要精确伪码(PN码)同步这一难题,给出了一个基于 FPGA的实现方案,并对其进行了时序仿真及和硬件调试,结果表明电路工作正确可靠,能满足设计要求。
补充资料：相干散射和非相干散射
再辐射的光量子频率和被吸收的光量子频率准确相等的散射过程称为相干散射。在相干散射的情况下，源函数准确地等于平均辐射强度。再辐射的光量子频率和被吸收的光量子频率不相等的散射过程称为非相干散射。在天体物理中，存在一系列因素使散射过程成为非相干散射。主要的因素是：原子的能级有一定的宽度、原子的热运动和湍动以及压力效应等。对于非相干散射，源函数是相当复杂的。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条