ABSTRACT
A mobile telephone system is defined as a communications network via radio which allows continuous mobility by dividing its coverage area into cells. Wireless communications, on the other hand, implies radio communications without necessarily requiring handover from one cell to another during an ongoing call. The cellular communications network was originally proposed by Douglas H. Ring, who worked for the Bell Telephone Laboratories, in the USA, in 1947. The procedures for completing and maintaining a call are similar to those of the digital systems, but are easier to understand using the analog procedures. For amplitude modulated signals, the multiplicative noise would be incorporated into the modulating signal, making it difficult to recover the original modulating signal.
