Wednesday, December 11, 2019

Wireless communications Essay Example For Students

Wireless communications Essay INTRODUCTIONWireless communications are becoming increasingly popular in todays fast paced world. Mobility, portability, and instant access (via the Internet) to unlimited information have become the mantra of businesses and individuals alike. The evolution of wireless communications has been incredibly quick and the future of this technology is unlimited. The impact of this technology on our lives will be tremendous and allow us to do things we never imagined. What Is Wireless Communication?The two main wireless services in use today are cellular and private packet radio. The service that is chosen will depend on the application(s) that a company or individual wants to run. CellularCellular technology is commonplace in both the business and private sector. There are two types of cellular technology: 1) circuit-switched cellular, and 2) Cellular Digital Packet Data (CDPD). One of circuit-switched cellulars biggest advantages is its nationwide availability.Another advantage is the ability to send voice and data over the cellular phone network. Circuit-switched cellular is ideal if the application requires the exchange of long text messages, large files, or faxes because it typically charges by the minute of connect time, not by the number of bytes transferred. A practical application for this technology is the transfer of data from a laptop by means of a cellular modem and phone. The initial cost to outfit a laptop to connect to a cellular network is about $400. A disadvantage of this type of service is the long set-up time each connection requires (about 30 seconds). Cellular Digital Packet Data is best suited for transaction processing and database quer ies. This service offers fast call setup (about 5 seconds), and is inexpensive for short messages, such as sending e-mail. The main disadvantages of CDPD are the expense of large file transfers, and the limited availability of the service (currently it is available in about 40 cities nationwide). Private Packet RadioPrivate packet radio, though not as common as cellular, offers businesses widespread connectivity. The two major private packet radio providers in the U.S. are Ardis and RAM Mobile Data. These services can be connected to from virtually anywhere in the country. Private packet radio offers quick call setup and is well suited to communications that generate short, bursty messages, such as e-mail, database queries and point of sale applications. Since private package radio has been around for several years, there are many applications that use the network. Some of the commercial applications being used handle messaging, scheduling, electronic filing of expense reports, and even allow for insurance agents to process accident claim forms from a customers house or office (Salamone 96). The disadvantage with private packet radio, like CDPD, is that it is expensive for large file transfers. The fundamental problem that wireless communications faces is that none of the major wireless data services is ideal for all applications. The stumbling blocks to widespread adoption of data connections for laptops and personal digital assistants (PDAs) include the lack of compatibility between services, the cost of the services, and the size and price of wireless modems. History of Wireless CommunicationsRadio telephones have been used for decades, but have not been widely available due to limited system capacity. The breakthrough that addressed this capacity problem was the development of the cellular concept, which allows frequency reuse. Needless to say, the use of wireless communications has increased exponentially since that breakthrough. The evolution of wireless systems can be divided into several stages: 1) the preprevailing stage, 2) the first generation analog system, 3) the second generation digital system, and 4) the third generation system (to be discussed later). The promised services, the required technologies, and the developmental timetable are summarized in Table 1 (see appendix A). The Civil Rights Movement EssayTerminal MobilityTerminal mobility is associated with wireless access and requires that the user carry a terminal and be within the radio coverage area. The scope and applications of terminal mobility are rapidly expanding through advances in wireless access technologies and miniaturization of mobile terminals (Pandya 44). Digital Cordless Telecommunication Systems are intended to provide terminal mobility in residential, business, and public access applications where the users can originate and receive calls on their portable terminals as they change locations and move about at pedestrian speeds within the coverage area. This type of system would lend itself to an academic environment where students could access information from the library, professors could give lectures, and assignments could be turned in without an actual physical building, classroom, or office. The range of applications often associated with Personal Communication Systems is illu strated in Figure 3 of Appendix A.!A Current TrendPower paging is the current trend in wireless services and is paving the way for PCS. In actuality power paging is a bit of a misnomer, in that the terminal is more of a computing device than standard pagers. Motorola has made a bid for leadership in the two-way wireless market with the announcement of Memos, an ambitious, client/server-based messaging platform (Matzkin 31). Memos provides both a complete operating environment and an open development environment. This device will offer wireless Web access and a lot of messaging options, including e-mail, fax, and voice messaging. All of this while fitting into the palm of your hand. CONCLUSION The fusion of computers and communications into a unified entity may appear to be a subtle distinction from the computers and networks popular today.

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