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History of development of mobile phones

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					                            History of development of mobile phones

Americans in 1902, called "Nathan Stubblefield," the country residence of Murray, Kentucky,
made the first wireless telephone device, this phone can be a wireless mobile communication is
human "mobile phone" technology The earliest exploration studies.

In 1938, Bell Laboratories in the U.S. for the U.S. military made one of the world's first mobile
phone mobile phone

In April 1973, Motorola Engineering Technician Martin Cooper invented the world's first one to a
civilian phone, Martin Cooper, "is now also known as the modern" phone parent ".

1G

Phone the first generation (1G) is the analog mobile phone is Big Brother in the 1980s and 1990s,
Hong Kong, China, the United States and other film and television works. First developed a cell
phone is a Motorola, Dr. Cooper. Due to the constraints of the battery capacity constraints and
analog modulation techniques need a huge antenna and integrated circuit development, this
phone looks boxy, only can move is not really portable. Many people call this phone for the
"bricks and mortar" Black Edition. This phone has a variety of formats, such as the NMT, AMPS,
TACS, but basically using frequency division multiplexing is only for voice communications, the
received signal instability, and lack of confidentiality, wireless bandwidth is underutilized. Such a
phone similar to the simple radio duplex radio, the calls are locked in a certain frequency, so the
use of FM radio can eavesdrop on calls.

2G

Second-generation mobile phones (2G) is the most common mobile phones. Often, these phones
use a very mature standard PHS, GSM or CDMA, with a stable quality of the call and standby time.
In the second generation in order to meet the needs of data communications, some intermediate
standards are on the phone are supported, such as support for MMS, GPRS and WAP services,
Internet services, as well as a variety of Java programs.

3G

3G, is the English 3rdGeneration acronym refers to the third generation mobile communication
technology. Relative to the first generation analogue phones (1G) and second-generation GSM,
CDMA digital mobile phone (2G), third generation of mobile phones generally, refers to wireless
communications and Internet multimedia communications with a new generation of mobile
communication systems. It can handle images, music, video streaming and other forms of media,
including web browsing, conference calls, e-commerce and other information services. In order
to provide this service, the wireless network must be able to support different data transfer
speed, and means that the indoor, outdoor, and driving environment can support at least 2Mbps
(megabits / second) and 384kbps (kilobits / second) and 144kbps transmission speed.
3G mobile phone

Relative to the first generation analogue phones (1G) and second-generation GSM, TDMA digital
mobile phones (2G), the name of the 3G communication range, the ITU provisions for IMT-2000
(International Mobile Phone 2000) standard, the European telecommunications The giants are
called as "UMTS" Universal Mobile Telecommunications System. At present, the international 3G
mobile phone (3G handsets) There are three standard criteria: the European WCDMA standard,
the CDMA2000 standard in the United States, and proposed by Chinese scientists, TD-SCDMA
standard.

3G communications will soon become the mantra of people's lips, so-called 3G, in fact, it's called
the 3rd Generation, Chinese meaning refers to the third generation of digital communications.
1995 came the first generation of digital mobile phones only for voice calls; the second
generation of digital mobile phones in 1996-1997 will receive data, such as to receive e-mail or
Web pages; the third generation of the main difference with the previous two generations of
enhance voice and data transmission speed, it can handle images, music, video streaming and
other forms of media, including web browsing, conference calls, e-commerce and other
information services. Relative to the first generation analogue phones (1G) and
second-generation GSM, TDMA digital mobile phones (2G), the name of the 3G communication
range, the ITU provisions for IMT-2000 (International Mobile Phone 2000) standard, the
European telecommunications The giants are called as "UMTS" Universal Mobile
Telecommunications System. The standard requires that the mobile terminal moves to speed, the
transmission data rate of 144kbps, outdoor stationary or walking speed was 384kbps, and indoor
2Mbps. However, these requirements are not available rate means that the user can achieve
2Mbps, because indoor rate will also depend on the detailed frequency planning and close
collaboration of organizations and operators in the building.

4G is referred to as fourth-generation mobile communications technology, able to transmit high
quality video images, and image transmission quality comparable to high-definition television
technology products.

   Currently the most widely used worldwide mobile phone is a GSM and CDMA mobile phones.
In mainland China and Taiwan is the most common with GSM, CDMA and PHS (PHS) mobile
phone is also very popular, these are the so-called second-generation mobile phones (2G), they
are all digital formats, in addition to voice communication, but also You can send and receive SMS
(short messaging, SMS), MMS (Technical) | MMS (MMS, MMS), Wireless Application Protocol
(WAP). Phone appearance generally should include at least one liquid crystal display and a set of
keys (part of the touch-screen phone to reduce the key). In addition to the typical features of the
phone, some phones also includes more features such as PDAs, game consoles, MP3, camera,
sound recording, camera, location, trends in the development of the Pocket PC with phone
functionality.

				
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