Cellular Networks: An Evolution from 1G to 4G
A cellular network is a wireless communication network which provides services to mobile users covered by a region consisting of multiple cells. Frequency reuse is a fundamental concept in cellular networks.
Prior to the invention of cellular technologies, there were few mobile telephone systems in the late 1940s in the USA and in the early 1950s in Europe, such as car-based telephone systems. The push-to-talk technique was used in these systems, and communication was performed over a single channel. With a single channel and a single antenna at each device, the transmission and reception of signals were performed in a half-duplex manner. Due to low capacity, restricted mobility support, and poor service quality, those systems were not efficient. Later on, mobile telephone system (MTS) and improved MTS (IMTS) were introduced in order to support a larger number of mobile stations. IMTS adopted two...
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