The history and inventor of mobile phones

1988, German scientists successfully completed some experiments, which proved that energy can be transmitted through wires. Later, it was confirmed that electromagnetic waves can be used to transmit information over a long distance, and applied for the patent of the world's first wireless telegraph system. Almost at the same time, Russia and some people in Russia announced a wireless communication system. The early 20th century is a crucial period for the development of wireless communication. The transatlantic wireless communication construction plan, the establishment of wireless telegraph company, the installation of wireless communication equipment on merchant ships and the establishment of coastal radio stations all over the world have been realized one after another. 19 12 The tragedy of the sinking of Titanic attracted the attention of major countries and began to install wireless communication systems on their warships. At this time, wireless communication officially entered military use. At the end of the first decade of the 20th century, the Air Force also began to invest in the development of wireless communication technology and set up radio stations around the world. At that time, wireless communication was not only the main contact way of ocean fleet, but also the main communication way between allied and German commanders and field commanders. Therefore, the outbreak of World War I contributed a lot to the improvement of wireless communication technology. 1920, wireless broadcasting began to enter commercial operation in all countries of the world. 1947, Bell Laboratories put forward the concept of mobile phone system, but due to technical problems, it has remained in the theoretical stage. 1980, Sweden, Denmark, Norway and Finland in northern Europe first opened the world's first public mobile phone system, and then quickly spread to North America, Europe, Asia-Pacific region and Australia, and its application also expanded from the initial car mobile phone to the application of providing personal communication. 1980, GSM system was put forward and adopted as the European standard for digital mobile phones. At present, 47 countries around the world adopt at least 70 GSM mobile phone networks. In addition to voice communication, GSM can also provide built-in data, fax and SMS services. In addition, GSM needs to cooperate with user identification, which can provide users with the ability of global roaming and more security and encryption functions. The first generation of mobile phones officially appeared. In the following decades, according to the needs of life, the communication technology of mobile phones has been continuously improved, and the first generation (1G), the second generation (2G), the second generation (2.5G), the third generation (3G) and even the fourth generation (4G) mobile phones have appeared. Their differences are shown in the following table: the first generation (1G), the second generation (2G) and the third generation (3G) systems are analog digitization, digitization, and the main systems AMPS, NMT and TACS GSM, CDMA and TDMA WCDMA* CDMA-2000 and TD-SCDMA voice applications voice+small circuit switching system voice+small packet switching system have less than 500,000 local users. About 5.9 million (forecast), and the speed of more than 5 million people depends on the analog signal mobile environment from 9.6kbps to 14.4kbps: 384kbps stable environment: 2Mbps is unstable, with incomplete coverage, low and stable sound transmission quality, more comprehensive coverage, safer coverage, ability to provide data services, accommodate more users, better sound transmission quality, multimedia data transmission and positioning ability. The second generation mobile phones operating in the 800-900 MHz frequency band transmit and receive by using cellular radio technology. 1992, China and Hongkong began to introduce the second generation mobile phones, while cellular technology still operated at 800-900 MHz. Digital radio technology is used to replace the first generation analog technology to improve the network capacity. Improve the call quality and provide international roaming service. The mobile phone systems currently used in mainland China and Hongkong belong to the second generation, including 9 GSM, 1 DAMPS and 1 CDMA networks, including 6 networks adopting GSM standard and17000 adopted in 1997. Used to describe a communication technical specification that is faster than 2G connection but slower than 3G connection. 2.5G system can provide some special functions only available in 3G, such as packet switching technology. TDMA and CDMA specifications developed by 2G can also be used. The most common 2.5G system is GPRS system; Official Chinese translation of GPRS system? Overall packet radio service technology? . There are also some draft protocols about communication systems. Includes the upgraded EDGE of GSM specification and the upgraded CDMA2000 1x-RTT of cdmaOne. They have reached the 3G standard speed of 1 sec 144 K, but this is their limit. The real 3G speed can reach MB speed of 1 sec. Therefore, it can only be classified as 2.5G The third generation mobile phone is characterized by providing global roaming service and providing high-speed data communication capability, which can be flexibly applied to different environments and is suitable for land and satellite communication. The third generation mobile phone provides basic voice service, mobile Internet service, mobile videophone and mobile data interaction service. The fourth-generation mobile phone 4G is sometimes written as 4-G, which refers to the fourth-generation mobile phone standard and is also an extension after 3G. Is a successful wireless communication system, which describes the following two different but overlapping concepts: high-speed mobile phone network, as fast as the bandwidth of computer network ASDL, can reach more than 10 Mbit/s per second. This concept is used to describe wireless networks, such as Wi-Fi. This is also the vision put forward by successful 3G system providers. What is the abstract statement about the technology of wireless network? Diffuse type? 、? Amorphous,? The whole? Wireless technology allows users to fully integrate into the system. It is possible to use Wi-Fi, UMTS or other systems to be imported in the future. This concept also includes ﹙Smart Radio﹚ technology, which can effectively handle ﹙spectrum use﹚ and transmission power. In addition, it can also filter and transmit a large amount of information to create a new generation of wireless network reference. Qid = 7006112304744 This is very nice. 1988 is the wrong year from the beginning. 1888? 1988, German scientists successfully completed some experiments, which proved that energy can be transmitted through wires. Later, it was confirmed that electromagnetic waves can be used to transmit information over a long distance, and applied for the patent of the world's first wireless telegraph system. Almost at the same time, Russia and some people in Russia announced a wireless communication system. The early 20th century is a crucial period for the development of wireless communication. The transatlantic wireless communication construction plan, the establishment of wireless telegraph company, the installation of wireless communication equipment on merchant ships and the establishment of coastal radio stations all over the world have been realized one after another. 19 12 The tragedy of the sinking of Titanic attracted the attention of major countries and began to install wireless communication systems on their warships. At this time, wireless communication officially entered military use. At the end of the first decade of the 20th century, the Air Force also began to invest in the development of wireless communication technology and set up radio stations around the world. At that time, wireless communication was not only the main contact way of ocean fleet, but also the main communication way between allied and German commanders and field commanders. Therefore, the outbreak of World War I contributed a lot to the improvement of wireless communication technology. 1920, wireless broadcasting began to enter commercial operation in all countries of the world. 1947, Bell Laboratories put forward the concept of mobile phone system, but due to technical problems, it has remained in the theoretical stage. 1980, Sweden, Denmark, Norway and Finland in northern Europe first opened the world's first public mobile phone system, and then quickly spread to North America, Europe, Asia-Pacific region and Australia, and its application also expanded from the initial car mobile phone to the application of providing personal communication. 1980, GSM system was put forward and adopted as the European standard for digital mobile phones. At present, 47 countries around the world adopt at least 70 GSM mobile phone networks. In addition to voice communication, GSM can also provide built-in data, fax and SMS services. In addition, GSM needs to cooperate with user identification, which can provide users with the ability of global roaming and more security and encryption functions. The first generation of mobile phones officially appeared. In the following decades, according to the needs of life, the communication technology of mobile phones has been continuously improved, and the first generation (1G), the second generation (2G), the second generation (2.5G), the third generation (3G) and even the fourth generation (4G) mobile phones have appeared. Their differences are shown in the following table: the first generation (1G), the second generation (2G) and the third generation (3G) systems are analog digitization, digitization, and the main systems AMPS, NMT and TACS GSM, CDMA and TDMA WCDMA* CDMA-2000 and TD-SCDMA voice applications voice+small circuit switching system voice+small packet switching system have less than 500,000 local users. About 5.9 million (forecast), and the speed of more than 5 million people depends on the analog signal mobile environment from 9.6kbps to 14.4kbps: 384kbps stable environment: 2Mbps is unstable, with incomplete coverage, low and stable sound transmission quality, more comprehensive coverage, safer coverage, ability to provide data services, accommodate more users, better sound transmission quality, multimedia data transmission and positioning ability. The second generation mobile phones operating in the 800-900 MHz frequency band transmit and receive by using cellular radio technology. 1992, China and Hongkong began to introduce the second generation mobile phones, while cellular technology still operated at 800-900 MHz. Digital radio technology is used to replace the first generation analog technology to improve the network capacity. Improve the call quality and provide international roaming service. The mobile phone systems currently used in mainland China and Hongkong belong to the second generation, including 9 GSM, 1 DAMPS and 1 CDMA networks, including 6 networks adopting GSM standard and17000 adopted in 1997. Used to describe a communication technical specification that is faster than 2G connection but slower than 3G connection. 2.5G system can provide some special functions only available in 3G, such as packet switching technology. TDMA and CDMA specifications developed by 2G can also be used. The most common 2.5G system is GPRS system; Official Chinese translation of GPRS system? Overall packet radio service technology? . There are also some draft protocols about communication systems. Includes the upgraded EDGE of GSM specification and the upgraded CDMA2000 1x-RTT of cdmaOne. They have reached the 3G standard speed of 1 sec 144 K, but this is their limit. The real 3G speed can reach MB speed of 1 sec. Therefore, it can only be classified as 2.5G The third generation mobile phone is characterized by providing global roaming service and providing high-speed data communication capability, which can be flexibly applied to different environments and is suitable for land and satellite communication. The third generation mobile phone provides basic voice service, mobile Internet service, mobile videophone and mobile data interaction service. The fourth-generation mobile phone 4G is sometimes written as 4-G, which refers to the fourth-generation mobile phone standard and is also an extension after 3G. Is a successful wireless communication system, which describes the following two different but overlapping concepts: high-speed mobile phone network, as fast as the bandwidth of computer network ASDL, can reach more than 10 Mbit/s per second. This concept is used to describe wireless networks, such as Wi-Fi. This is also the vision put forward by successful 3G system providers. What is the abstract statement about the technology of wireless network? Diffuse type? 、? Amorphous,? The whole? Wireless technology allows users to fully integrate into the system. It is possible to use Wi-Fi, UMTS or other systems to be imported in the future. This concept also includes ﹙Smart Radio﹚ technology, which can effectively handle ﹙spectrum use﹚ and transmission power. In addition, it can filter and transmit a large amount of information and create a new generation of wireless network reference. Geographical city /tpy cchi 06/ history.