通信系统

According to the physical layer technology of IEEE802.15.4a, this project plans to realize a basic chirp communication system.

但是目前的研究大多停留在理论层面，Chirp通信系统的具体实施研究的还比较少。

In this paper,a novel chirp signal for UWB systems instead of the conventional Gaussian monocycle is proposed.

目前在超宽带无线通信系统中，普遍采用的脉冲波形是高斯脉冲波形。

This project realizes a chirp communication system to transmit digital information such as voice and video.

本项目在IEEE802.15.4a标准背景下，实现采用Chirp信号传输数字语音和图像等信息的通信系统。

Researched influence of frequency on characteristic of electromagnetic wave transmission in tunnels, and analyzed characteristic of electromagnetic wave transmission in circular, arches and curved tunnels by method of metal wave guide, and gives approximate formulas of attenuation rate. Main conclusions we obtain are as follows: in circular,rches tunnels, if frequency is higher, attenuation rate is smaller, it is beneficial for EM waves to transmit, in curved tunnel, higher frequency, more attenuation rate ...

研究了频率对井下电磁波传输特性的影响，采用金属波导法分析了圆形、拱形及弯曲隧道中电磁波的传输特性并给出衰减率近似公式，得出主要结论：在圆形和拱形隧道中，频率越高，衰减率越小，越有利于电磁波的传播；在弯曲隧道中，频率越高，衰减率越大，不利于电磁波的传播；通过特性曲线与井下实验数据相比较得出在900MHz左右为井下无线通信系统传输信号最佳频段。

In late 1995, France is reported to have offerred the Clemenceau for free, provided that China bought radar and communications systems from French companies. Nothing came of the offer.

在1995的下半年，法国曾向中国建议免费提供其排水量为3.27万吨的"克莱蒙梭"号航母，但是作为交换条件，法国希望中国将利润丰厚的该舰雷达和通信系统的升级改装项目授予法国企业，可能是由于价格和舰体的问题，这一建议也未产生任何结果。

ACF/ TCAM during which incoming message traffic is suspended and queued outgoing messages are sent to their destinations before closedown is completed.

通信系统ACF／CAM的一种关闭方式，在完成清仓关闭前的关闭期间，将入报文挂起，将排队的出报文发送到各自的目的站。

Because UWB is a high data rate system, the encode project should be low rate and the codeword after encode should be short.

由于UWB是一个高速率的通信系统，因此编码方案必须速率要低而且编码后的码字要尽量短。

A general communication system, channel coding theorem and source-channel coding theorem.

通信系统的一般模型，信道编码定理和信源信道编码定理。

In this thesis, the basis of communication and channel coding theory is introduced briefly.

本文首先简述了通信系统以及信道编码理论的基础知识，并且对线性分组码的基本原理作了阐述。

This paper studies information hiding in audio signal by quantifying the amplitude of the transform domain coefficient and does some amelioration for the system communicated in analog circumstance.

本文主要讨论一种基于系数量化的音频信息隐藏算法，并针对模拟信道传输的通信系统特点对其作了一些改进。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷