History Wireless CommunicationHistory Wireless CommunicationWireless technology has it's origins in the world of walkie-talkie's and CB radios. As the technology improved, the devices have become more complex making it possible to communicate over longer distances with greater ease. If you've ever watched an old movie and heard the radio users say "over and out" or "roger" you've seen one of the limitations of simplex communications. Simplex communication is communication that can only occur in one way. In other words only one person can be talking at a time. This developed the need to communicate when you were done talking ("over and out") and that the message was received and understood ("roger"). Today's wireless communication devices use what is called duplex mode. In other words there can be two way communications going on at any time. This makes wireless communication much like the phone that you use everyday in your home or office.

The communication system used by early law enforcement agencies led to the development of today's wireless communications. The first cell phone became available in 1947. These phones were so large and required so much power to operate they had to be mounted in a car with a large power source in the trunk. To place a call you had to contact a central communication center who would dial the call for you. At that time only a very limited amount of bandwidth was available which severely limited the size and capabilities of the cellular network. The network was able handle a maximum of just over 20 simultaneous conversations at any given time. This network also had a very limited range. This caused the network to determine it was more efficient and economical to use smaller towers scattered over a wide range as opposed to fewer high powered cellular towers. The term cellular network is based upon using a large amount of small towers scattered over a large area. The towers created "cells" of service

At the time demand for this growing technology outpaced the supply. The Federal Communication Commission allowed only a very limited amount bandwidth for cellular communication. This shortage of supply led to large waiting lists that lasted 8 or more years.

As the cellular communications industry began to mature it began to operate on a digital or Personal Communication System (PCS). This is the predominant method of communication used by most major cellular service providers. One advantage of this type of technology was it allowed communications to be compressed and broken into digital pieces of information and transmitted more efficiently, allowing more subscribers per line.

Digital communications currently come in four different varieties

CDMA - Code Division Multiple AccessTDMA - Time Division Multiple AccessGSM - Global System for Multiple communicationsESMR - Enhanced Specialized Mobil Radio














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