Basics of Wireless Networks
The first commercially available radio and telephone system, known as the improved Mobile Telephone Service (IMTS), was put into service in 1946. A tall transmitter tower was erected near the center of a metropolitan area. Several assigned channels were then transmitted and received from the antenna atop this tower and any vehicle within range could attempt to seize ine of those channels and complete a call. Given these constrictions, the number of channels available did not come close to satisfying the demand. The solution of this problem was cellular radio. The initial transmission technology used between the vehicle and the cell site was analog in nature and known as AMPS.
A few years later, a third group of companies developed spread-spectrum technology called CDMA. The development of Personal Communication Service (PCS) industry led to search for additional ways to satisfy the obvious need.
Additional fraquency bands were allocated for their use. Unfortunately, after acquiring the spectrum, many of the new potential operators went bankrupt and never actually had a chance to use it
The first commercially available radio and telephone system, known as the improved Mobile Telephone Service (IMTS), was put into service in 1946. A tall transmitter tower was erected near the center of a metropolitan area. Several assigned channels were then transmitted and received from the antenna atop this tower and any vehicle within range could attempt to seize ine of those channels and complete a call. Given these constrictions, the number of channels available did not come close to satisfying the demand. The solution of this problem was cellular radio. The initial transmission technology used between the vehicle and the cell site was analog in nature and known as AMPS.
A few years later, a third group of companies developed spread-spectrum technology called CDMA. The development of Personal Communication Service (PCS) industry led to search for additional ways to satisfy the obvious need.
Additional fraquency bands were allocated for their use. Unfortunately, after acquiring the spectrum, many of the new potential operators went bankrupt and never actually had a chance to use it
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