通信系统

Modulation and demodulation, which is one of the most key techniques in communication, has been always an important aspect.

一个系统的通信质量，很大程度上依赖于所采用的调制方式。因此，对调制方式的研究，将直接决定通信系统质量的好坏[1，2]。

The present paper uses the direct sequence spread spectrum technology, key to short-wave communication and direct sequence spread spectrum correspondence characteristic as well as union advantage, wide frequency code production, the direct sequence spread spectrum communications system technology and the principle, the wide frequency synchronization technology, the RAKE receive technology has conducted the research and the analysis.

本论文采用直接序列扩频技术，重点对短波通信与直接序列扩频通信的特点以及结合的优点，扩频码的产生，直接序列扩频通信系统的技术与原理，扩频同步技术，RAKE接收技术进行了研究与分析。

In the invention, according to the channel selected by user, the client side determines the media server corresponding to the channel and the father node of the client side in the P2P system; according to the correlative information of the father node, the client side determines the initial fragment group ID of current process, and sends a request message for requesting the data of the channel to the media server; said request message contains said initial fragment group ID; said client side receives the channel data sent from the media server based on the initial fragment group ID, and receives the channel data sent from each father node.

本发明涉及互联网技术领域，尤其涉及一种网络通信数据处理方法、网络通信系统及客户端，用以减少选定频道的播放延迟。在本发明中，客户端根据用户选定的频道确定对应的媒体服务器及该客户端在点对点系统中的父节点；该客户端根据父节点的相关信息确定本次数据处理的起始分片组标识，并向该媒体服务器发送请求该频道数据的消息，该消息中携带该起始分片组标识；该客户端接收该媒体服务器根据该起始分片组标识发送的该频道的数据，且接收各父节点发送的该频道的数据。

MIMO can improve the capacity and the quality of communication and it need not to expand frequency band.

MIMO技术在不增加频谱带宽的情况下，可以提高无线通信系统的通信容量和通信质量。

Satellite mobile communication system has become one of the galloping communication research fields and a useful means of modern communication.

卫星移动通信系统已经成为当前通信领域中发展非常迅速的研究方向和现代化通信强有力的手段之一。

This paper, combined with the analysis of the voice channel coding structure and procedure of the system, introduces a new FPGA-based method to realize the interleaving of system and improve the dependability of the whole communication system.

在分析TETRA数字集群通信系统语音信道编码结构和流程的基础上，基于FPGA技术的采用块内交织方法的交织器，提高了整个通信系统的可靠性。

In order to overcome ISI and decrease bit error rate, equalization technology is widely used in high speed wireless communication system.

为了消除码间干扰，降低通信系统的误码率，均衡技术被广泛的应用在各种高速率无线通信系统中。

This lesson a research expresses, passing a procedure of the place of honor machine a string of an adjoin orifice delivers to the development knothole FPGA chip an inside of saving machine inside, and make use of the NIOS development a the software of SDK in the piece the end realizing a string of a correspondence is complete viable, can satisfy the each a fleetness for corresponding by letter system, efficiently, the development trend of the small scaled and big capacity.

本课题研究表明，将上位机的一段程序通过串行接口传送到开发板的FPGA芯片内的存储器中，并且利用NIOS开发套件中的SDK软件最终实现串行通信是完全可行的，可以满足各系统之间的串行通信系统的快速、高效、小型、大容量的发展趋势。

The maintenance terminal possesses first CPU, first light receiver, and first light transmitting tube. The communication system to be maintained possesses indicator light and second CPU, and second light receiver.

该装置包括带有第一CPU的维护终端，所述被维护通信系统带有指示灯及第二CPU，所述维护终端带有第一光接收管和第一光发射管，被维护通信系统上带有第二光接收管。

Based on the project of wireless monitoring system in power systems,the multithread communication protocol and design thinking of high speed serial communication are analyzed.

以电厂通信系统应用中的无线智能监控网络系统为项目背景，分析了多线程通信协议在串行数据高速传输中的作用和设计思想。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。