Communication principle between telephone and mobile phone

Telephone communication is a communication technology that uses electricity as the medium and transmits language through the mutual conversion of acoustic energy and electric energy. The simplest way for two users to communicate is to connect two phones with a pair of wires.

The mobile phone is connected with the base station of the mobile network through wireless signals, and the base station is connected with other network elements of the mobile network through cables. It adopts the technology of cellular coverage, and the biggest advantage of cellular coverage is that the frequency can be reused, which saves the frequency resources very effectively.

Extended data:

Any communication behavior can be regarded as a communication system. For a communication system, it includes the following three elements: source, channel and destination.

Whether wired or wireless, electromagnetic waves propagate-in wired cables, electromagnetic waves propagate in the form of guided waves, while in air (vacuum), electromagnetic waves propagate in the form of spatial waves.

At the same time, the communication system transmits digital signals. The common modulation methods of digital signals are amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK) and quadrature amplitude modulation (QAM).

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Baidu Encyclopedia —— Concise Principles of Mobile Communication