电子信息与通信工程专业英语lesson5(太原理工大学版)ppt课件.ppt
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1、2023年1月9日星期一,电子信息与通信工程专业英语,Chapter 5 Communication 第5章 通信,2023年1月9日星期一,电子信息与通信工程专业英语,5.1 A Short History of Communication 通信简史5.2 Wireless Communication Technology 无线通信技术 5.3 Optical Fiber Communication 光导纤维通信,2023年1月9日星期一,电子信息与通信工程专业英语,5.4 Basic Networking Concepts for Computer Network 应用于计算机网络的基础网
2、络概念,2023年1月9日星期一,电子信息与通信工程专业英语,TEXT 文章 5.1 A Short History of Communication,1.Original technologies of communication 2.Communication at the speed of electricity,2023年1月9日星期一,电子信息与通信工程专业英语,convergence n.集中,收敛,融合 courier n.送快信的人,旅行从仆circuit switching 电路交换cyber terrorism n.网络dot-coms n.网络企业 ecommerce n
3、.电子商务heliograph n.日光仪,2023年1月9日星期一,电子信息与通信工程专业英语,Interface Message Processors n.接口信息处理机 message switching 报文交换monopoly n.垄断semaphore n.信号灯shackle vt.束缚skeptics n.怀疑学派sabbatical n.学术假期Telenet n.远程通信网Telecopier n.远程复印机,2023年1月9日星期一,电子信息与通信工程专业英语,No matter what career you enter,youll need to communicat
4、e with people.We believe that cultural,social,and personal experience improves through more effective understanding and practice of communication.Communication Studies seek to understand communication and to improve its practice in a variety of relationships.,2023年1月9日星期一,电子信息与通信工程专业英语,We focus on t
5、wo person and family communication,communication in small groups and in large organizations,communication across communities,the nature of language and symbols,and the nature of argument and persuasion in political settings and in social movements.,2023年1月9日星期一,电子信息与通信工程专业英语,The history of communica
6、tion can go back to thousands of years.However,the technologies that so many of us are addicted to today-mobile phones,the internet,satellite TV-are built on our achievements.,2023年1月9日星期一,电子信息与通信工程专业英语,Each new development has transformed the world we live in.An understanding of the journey we have
7、 taken to get where we are now shows that todays techniques are refinements of what came before.Really big revolutions may be still to come.,2023年1月9日星期一,电子信息与通信工程专业英语,1.Original technologies of communication,Communication begins with the first conversations between people.Fire and the smoke it prod
8、uces may also have been used for simple communication between separated groups.,2023年1月9日星期一,电子信息与通信工程专业英语,The invention of the printing press in China some time after 300AD meant that the same message could be delivered to many people cheaply and more quickly than copying out the message many times
9、 by hand.,2023年1月9日星期一,电子信息与通信工程专业英语,2.Communication at the speed of electricity,With the discovery of electricity the speed and range of communication once again began to increase.,2023年1月9日星期一,电子信息与通信工程专业英语,The invention of techniques such as Morse code allowed complex messages to be transferred a
10、t very high speeds over this new medium.These had huge repercussions for many aspects of human life,for example,transport could be better coordinated,government could transmit decisions to distant offices almost instantaneously,and businesses could work with more businesses over larger distances.,20
11、23年1月9日星期一,电子信息与通信工程专业英语,The first amplitude modulation(AM)radio station began operating in Springfield,Mass.,shortly after World War I,and the first frequency modulation(FM)station was authorized to operate by the Federal Communications Commission(FCC)in 1940.,2023年1月9日星期一,电子信息与通信工程专业英语,The first t
12、elevision station was authorized by the FCC in 1941 and the first CATV station system began several years later.,2023年1月9日星期一,电子信息与通信工程专业英语,See Table 5-1 Electrical communication history,2023年1月9日星期一,电子信息与通信工程专业英语,At the same time as these developments in sound,people were working hard on capturing
13、images.For hundreds of years artists and scientists had known that a small hole in the wall of a darkened room would project an image of the outside world on the opposite wall.,2023年1月9日星期一,电子信息与通信工程专业英语,In 1814 Joseph Nicphore Nipce used this principle to project an image of the world onto chemical
14、ly treated paper in a box,so the first photograph had been taken.Images from one part of the world could be brought to another.,2023年1月9日星期一,电子信息与通信工程专业英语,This allowed people in Tanzania to see what a London Street looked like,and people in London to marvel at Maasai warriors dressed in their finery
15、.In 1877,Eadweard Muybridge developed a camera which could take a series of photographs in rapid succession.,2023年1月9日星期一,电子信息与通信工程专业英语,He did this in order to win a bet on whether all a horses hooves left the ground when it ran.He lost the bet,but invented the movie camera.By 1927 this had been com
16、bined with recorded sound,allowing people to share realistic experiences around the world.,2023年1月9日星期一,电子信息与通信工程专业英语,The technologies that we have discussed have all helped us store and transmit communication.All these technologies are joining together in the form of computers and the internet.,202
17、3年1月9日星期一,电子信息与通信工程专业英语,5.2 Wireless Communication Technology,1 Introduction2.Wireless communication technology,2023年1月9日星期一,电子信息与通信工程专业英语,In 1895,Guglielmo-Marconi opened the way for modern wireless communications by transmitting the three-dot Morse code for the letter S over a distance of three ki
18、lometers by electromagnetic waves.,2023年1月9日星期一,电子信息与通信工程专业英语,Introduction There are two fundamental aspects of wireless communication that make the problem challenging and interesting.,2023年1月9日星期一,电子信息与通信工程专业英语,First is phenomenon of fading:the time variation of the channel strengths due to the sm
19、all-scale effect of multipath fading and shadowing by obstacles.Second,wireless users communicate over the air and there is significant interference between them.,2023年1月9日星期一,电子信息与通信工程专业英语,The interference can be between transmitters communicating with a common receiver,between signals from a singl
20、e transmitter to multiple receivers,or between different transmitter-receiver pairs.,2023年1月9日星期一,电子信息与通信工程专业英语,How to deal with fading and interference is central to the design of wireless communication.,2023年1月9日星期一,电子信息与通信工程专业英语,There are many wireless communications technologies that can be diff
21、erentiated by frequency,bandwidth,range,and applications.,2023年1月9日星期一,电子信息与通信工程专业英语,These categories range from wireless wide area networks(WWANs)which cover the widest geographic area,to wireless personal area networks(WPANs)which cover less than 10 meters.,2023年1月9日星期一,电子信息与通信工程专业英语,2.Wireless co
22、mmunication technology WPAN,A WPAN is a personal area network,a network for interconnecting devices centered around an individual persons workspace,in which the connections are wireless.,2023年1月9日星期一,电子信息与通信工程专业英语,communication within about 10 meters used mainly as cable replacement technologies for
23、 data synchronization and connectivity for devices that are close to each other.,2023年1月9日星期一,电子信息与通信工程专业英语,Bluetooth wireless technology is the prevalent WPAN technology today.It operates in the 2.4-GHz unlicensed frequency band.Ultra-wideband(UWB)technology provides high bandwidth by transmitting
24、at very low power across a broad frequency spectrum.,2023年1月9日星期一,电子信息与通信工程专业英语,Wireless LANs,A Wire LAN(WLAN),which sometimes referred to as LAWN robust wireless network connectivity over a local area of approximately 100 metersoperates in the 2.4-GHz frequency band at 11 Mbps,2023年1月9日星期一,电子信息与通信工
25、程专业英语,802.11 standards use the Ethernet protocol and Carrier Sense Multiple Access with Collision Avoidance(CSMA/CA)for path sharing and include an encryption method,the Wired Equivalent Privacy algorithm.,2023年1月9日星期一,电子信息与通信工程专业英语,WiFi focus on user authentication and encryption Multiple-Input Mul
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