time hopping

In this paper, the multiple access performances of spread spectrum with chaotic sequence and that with pseudo-random sequence, pseudo-( chaotic) time hopping and conventional time hopping are compared, in terms of theoretical analysis of bit error rate, simulation results and the receiver.

从误码率理论分析、性能仿真和接收机结构等几个方面对混沌序列扩频与伪随机序列扩频、伪混沌跳时与传统跳时多址接入方式进行比较研究。

In hopping, the feet move almost at the same time.

跳跃时，双脚几乎是同时移动的。

In order to reduce the interference to other communications systems during transmission, the method of spread spectrum is proposed, including the time hopping and direct sequence.

为了减小在传输过程中对其他通信系统产生干扰，提出了频谱扩展的方法，包括时间跳跃和直接序列。

In order to reduce the effects of MUI, this paper presents a novel waveform design method based on wavelet& combined waveforms, and this waveform is used in a multiple access system with time hopping ( TH) sequence.

为了降低多用户干扰的影响，提出了一种新型的基于正交小波的脉冲波形构造方法&组合波形，并且将这种波形连同跳时序列一起应用到多用户系统中。

The analysis shows that the improvement of ICI from increasing the pulse repetition period is slower than equidistance transmitting pulse when the manner of transmitting pulse is time hopping.

与采用等间距发送脉冲时的码间干扰对比，结果显示，随着脉冲重复周期增大，跳时UWB的码间干扰的改善的速度比等间距发送脉冲时缓慢。

The research results indicate that by introducing a pseudo-random time hopping code to the code domain transmitted reference structure to the code domain transmitted reference structure, the scheme can effectively control the influence of multiple access interference. And the system realization complexity is low. 4.

研究结果表明，通过引入一组伪随机跳时码，结合自身的码域发送参考结构，这种多址接入方法可以有效控制多址干扰的影响，并且系统实现复杂度较低。

And time hopping technology is adopted to resolve the problem of the multi-user access and the system parameter selection.

采用跳时技术解决了系统多用户接入和系统参数的选取。

Main contents studied include: ( 1) nonlinear adaptive filter predicting chaotic time series and hopping frequency code;

主要内容为：（1）非线性自适应滤波器对混沌时间序列及跳频码的预测；

Study On Time-Hopping Of Ultra-Wideband Radio

超宽带无线电系统跳时技术的研究

Synchronization Scheme for Frequency Hopping Communication System Based on Time of Day

一种基于时间信息TOD的跳频同步方法

The lifetime is a critical parameter for time hopping ultra wide band ( TH-UWB) wireless sensor networks.

生存期是跳时超宽带无线传感网的一个关键参数。

A new construction scheme of 2D-OOC with time spreading/ wavelength hopping

时域扩频/波长跳频2D-OOC的一种新构造方案

Investigation of Upper-Bounds on BER of OCDMA Systems Using Time Spreading/ Wavelength Hopping Codes

跳频扩时光码分多址系统误码率上限的研究

The traditional anti-jamming techniques-such as High-speed Frequency Hopping Technology, Spread Spectrum Coding Technology and Time Hopping Technology-are based on the degree of freedom in the frequency domain, or time domain to get the improvement of the anti-jamming performance.

传统的抗干扰技术例如高速跳频，扩频编码以及跳时技术都是分别以频率域，时间域上的自由度资源为基础来获得抗干扰性能的提升的。

Pseudo-Chaotic Time Hopping with Multi-tent Map and DSP Scheme for UWB

UWB伪混沌跳时多帐篷映射及DSP实现方法研究

This paper gives a serial acquisition method which can be easily implemented in time hopping ultra-wide band system.

根据超宽带系统多径延迟的特点，该文给出一种易于实现的超宽带跳时串行捕获方法；

An improved pseudo-chaotic time hopping scheme for UWB multiple access

UWB系统的一种改进型伪混沌跳时多址接入技术

The first method presents a class of time hopping ( TH) codes and the method for selecting signal parameters, while the second method proposes the signal design to reduce the mutual interference independently of TH codes.

第一种方案提出了一种灵活地降低系统间相互干扰的TH码和信号设计方法，第二种方案提出了与TH码无关地降低系统间相互干扰的信号设计方法。

Pseudo-chaotic time hopping is a modulation method which is suitable for ultra wide-bandwidth impulse radio communication systems.

伪混沌跳时是一种适用于超宽带脉冲无线电通信系统的调制方法。

After my 6 a.m. wake-up, I have a lot of time to loll around, hopping in the shower and then throwing makeup on my face, hoping that I'll have enough time to put my tights on before my son starts crying in his crib.

早上六点之后醒来，我就无所事事，洗洗澡，打扮打扮，在躺在婴儿床里的孩子哭之前我还有充足的时间套上紧身衣。