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• History Of Wireless Communication Pdf Download
• Timeline Of Wireless Technology
• History Of Mobile Telecommunications

• . Ultra Wide Band (UWB) is an emerging wireless communications technology that can transmit data at around 100 Mb/s (up to 1000 Mb/s). UWB transmits ultra-low power radio signals with very narrow pulses (nanosecond). Because of its low power requirements, UWB is very. Difficult to detect (hence secure).
• Applications of the Underwater Wireless Communication: It has the application in marine archaeology, search and rescue machines and defense. It is also used in seismic monitoring, pollution monitoring and ocean currents monitoring. The underwater wireless communication is used in the equipment monitoring and control and also in the autonomous underwater vehicles (AUV).
• 4 Chapter 1. Introduction to Wireless Communication Systems 1.2 Mobile Radiotelephony in the U.S. In 1946, the first public mobile telephone service was introduced in twenty-five major American cities. Each system used a single, high-powered transmitter and large tower in order to cover dis-tances of over 50 km in a particular market.

During the 1800s, there was a rush among inventors to develop newer and better ways to allow long distance and mass communication. Writing a letter is a form of communication that has persisted despite all of the high-speed technologies available today. However, the way it is delivered has changed a great deal over the years. Overview of Wireless Communications. Wireless communications is, by any measure, the fastest growing segment of the communications industry. As such, it has captured the attention of the media and the imagination of the public. The history of telecommunication began with the use of smoke signals and drums in Africa, the Americas and parts of Asia. In the 1790s, the first fixed semaphore systems emerged in Europe. However, it was not until the 1830s that electrical telecommunication systems started to appear. This article details the history of telecommunication.

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• UMTS Tutorial

• Cellular Concepts

• UMTS Introduction

• UMTS Networks Standardization

• UMTS Protocol Environment

• UMTS Useful Resources

• Selected Reading

Wireless communication was a magic to our ancestors but Marconi could initiate it with his wireless telegraph in 1895. Wireless Communication can be classified into three eras.

• Pioneer Era (Till 1920)
• Pre Cellular Era(1920-1979)
• Cellular Era (beyond 1979)

The first commercial mobile telephone system was launched by BELL in St. Louis, USA, in 1946. Few lucky customers got the services. Early mobile systems used single high power transmitters with analog Frequency Modulation techniques to give coverage up to about 50 miles and hence only limited customers could get the service due to this severe constraints of bandwidth.

Cellular Era

To overcome the constraints of bandwidth scarcity and to give coverage to larger sections, BELL lab introduced the principle of Cellular concept. By frequency reuse technique this method delivered better coverage, better utility of available frequency spectrum and reduced transmitter power. But the established calls are to be handed over between base stations while the phones are on move.

Even though the US based BELL lab introduced the cellular principle, the Nordic countries were the first to introduce cellular services for commercial use with the introduction of the Nordic Mobile Telephone (NMT) in 1981.

First Generation Systems

All these systems were analog systems, using FDMA technology. They are also known as First Generation (1G) systems. Different systems came into use based on the cellular principle. They are listed below.

Disadvantages of 1G systems

• They were analog and hence are were not robust to interference.
• Different countries followed their own standards, which were incompatible.

To overcome the difficulties of 1G, digital technology was chosen by most of the countries and a new era, called 2G, started.

Advantages of 2G

• Improved Spectral Utilization achieved by using advanced modulation techniques.
• Lower bit rate voice coding enabled more users getting the services simultaneously.
• Reduction of overhead in signaling paved way for capacity enhancement.
• Good source and channel coding techniques make the signal more robust to Interference.
• New services like SMS were included.
• Improved efficiency of access and hand-off control were achieved.

History of GSM

GSM standard is a European standard, which has addressed many problems related to compatibility, especially with the development of digital radio technology.

Milestones of GSM

• 1982 - Confederation of European Post and Telegraph (CEPT) establishes Group Special Mobile.
• 1985 - Adoption of list of recommendation was decided to be generated by the group.
• 1986 - Different field tests were done for radio technique for the common air interface.
• 1987 - TDMA was chosen as the Access Standard. MoU was signed between 12 operators.
• 1988 - Validation of system was done.
• 1989 - Responsibility was taken up by European Telecommunication Standards Institute (ETSI).
• 1990 - First GSM specification was released.
• 1991 - First commercial GSM system was launched.

History Of Wireless Communication Pdf Download

Frequency Range of GSM

Timeline Of Wireless Technology

GSM works on four different frequency ranges with FDMA-TDMA and FDD. They are as follows −

History Of Mobile Telecommunications