The first commercially available analog cellular system, Advanced Mobile Phone System (AMPS) served as the foundation for the first generation (1G) of mobile wireless communication. Developed by Bell Labs in the 1970s, AMPS was introduced in the United States in 1983 and became the predominant cellular technology during the 1980s and early 1990s. AMPS operated in the 800 MHz frequency band and used Frequency Division Multiple Access (FDMA) for channel allocation. It employed analog modulation techniques to transmit voice signals over the airwaves.
Technical Specifications
AMPS provided basic voice call capabilities, allowing users to make and receive calls while on the move within the coverage area. The system used analog modulation techniques to transmit voice signals over the airwaves, operating in the 800 MHz frequency band. AMPS employed Frequency Division Multiple Access (FDMA) for channel allocation, dividing the available frequency spectrum into individual channels for each call.
Limitations
AMPS had some limitations compared to modern digital cellular systems. It lacked features like encryption, which made conversations susceptible to eavesdropping. AMPS also had limited capacity, meaning it could support a limited number of simultaneous calls per cell. The technology also suffered from reduced call quality due to analog signal degradation and interference.
Historical Deployment
AMPS was officially introduced in the Americas on October 13, 1983, and was deployed in many other countries, including Israel in 1986, Australia in 1987, Singapore in 1988, and Pakistan in 1990. It was the primary analog mobile phone system in North America and other locales through the 1980s and into the 2000s. As of February 18, 2008, carriers in the United States were no longer required to support AMPS, and companies such as AT&T and Verizon Communications have discontinued this service permanently. AMPS was discontinued in Australia in September 2000, in India in October 2004, in Israel in January 2010, and in Brazil in 2010.
Legacy
AMPS served as the foundation for subsequent digital cellular technologies, such as 2G (Second Generation) systems like GSM and CDMA. As technology advanced, AMPS networks were gradually phased out and replaced by more efficient and capable digital cellular networks.