ABSTRACT
The first generation of cellular networks (1G) were analog, deployed between 1980 and 1992. 1G included a myriad of cellular systems, namely, the total access communication system (TACS), the advanced mobile phone system (AMPS), and the Nordic mobile telephony (NMT), among others. These systems were of low reliability, low capacity, low performance, and without roaming capability between different networks and countries. The multiple access technique adopted was frequency division multiple access (FDMA), where signals of different users are transmitted in different (orthogonal) frequency bands.
